1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2016 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"
74 #include <sys/types.h>
77 typedef struct symbol *symbolp;
80 /* When == 1, print basic high level tracing messages.
81 When > 1, be more verbose.
82 This is in contrast to the low level DIE reading of dwarf_die_debug. */
83 static unsigned int dwarf_read_debug = 0;
85 /* When non-zero, dump DIEs after they are read in. */
86 static unsigned int dwarf_die_debug = 0;
88 /* When non-zero, dump line number entries as they are read in. */
89 static unsigned int dwarf_line_debug = 0;
91 /* When non-zero, cross-check physname against demangler. */
92 static int check_physname = 0;
94 /* When non-zero, do not reject deprecated .gdb_index sections. */
95 static int use_deprecated_index_sections = 0;
97 static const struct objfile_data *dwarf2_objfile_data_key;
99 /* The "aclass" indices for various kinds of computed DWARF symbols. */
101 static int dwarf2_locexpr_index;
102 static int dwarf2_loclist_index;
103 static int dwarf2_locexpr_block_index;
104 static int dwarf2_loclist_block_index;
106 /* A descriptor for dwarf sections.
108 S.ASECTION, SIZE are typically initialized when the objfile is first
109 scanned. BUFFER, READIN are filled in later when the section is read.
110 If the section contained compressed data then SIZE is updated to record
111 the uncompressed size of the section.
113 DWP file format V2 introduces a wrinkle that is easiest to handle by
114 creating the concept of virtual sections contained within a real section.
115 In DWP V2 the sections of the input DWO files are concatenated together
116 into one section, but section offsets are kept relative to the original
118 If this is a virtual dwp-v2 section, S.CONTAINING_SECTION is a backlink to
119 the real section this "virtual" section is contained in, and BUFFER,SIZE
120 describe the virtual section. */
122 struct dwarf2_section_info
126 /* If this is a real section, the bfd section. */
128 /* If this is a virtual section, pointer to the containing ("real")
130 struct dwarf2_section_info *containing_section;
132 /* Pointer to section data, only valid if readin. */
133 const gdb_byte *buffer;
134 /* The size of the section, real or virtual. */
136 /* If this is a virtual section, the offset in the real section.
137 Only valid if is_virtual. */
138 bfd_size_type virtual_offset;
139 /* True if we have tried to read this section. */
141 /* True if this is a virtual section, False otherwise.
142 This specifies which of s.section and s.containing_section to use. */
146 typedef struct dwarf2_section_info dwarf2_section_info_def;
147 DEF_VEC_O (dwarf2_section_info_def);
149 /* All offsets in the index are of this type. It must be
150 architecture-independent. */
151 typedef uint32_t offset_type;
153 DEF_VEC_I (offset_type);
155 /* Ensure only legit values are used. */
156 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
158 gdb_assert ((unsigned int) (value) <= 1); \
159 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
162 /* Ensure only legit values are used. */
163 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
165 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
166 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
167 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
170 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
171 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
173 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
174 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
177 /* A description of the mapped index. The file format is described in
178 a comment by the code that writes the index. */
181 /* Index data format version. */
184 /* The total length of the buffer. */
187 /* A pointer to the address table data. */
188 const gdb_byte *address_table;
190 /* Size of the address table data in bytes. */
191 offset_type address_table_size;
193 /* The symbol table, implemented as a hash table. */
194 const offset_type *symbol_table;
196 /* Size in slots, each slot is 2 offset_types. */
197 offset_type symbol_table_slots;
199 /* A pointer to the constant pool. */
200 const char *constant_pool;
203 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
204 DEF_VEC_P (dwarf2_per_cu_ptr);
208 int nr_uniq_abbrev_tables;
210 int nr_symtab_sharers;
211 int nr_stmt_less_type_units;
212 int nr_all_type_units_reallocs;
215 /* Collection of data recorded per objfile.
216 This hangs off of dwarf2_objfile_data_key. */
218 struct dwarf2_per_objfile
220 struct dwarf2_section_info info;
221 struct dwarf2_section_info abbrev;
222 struct dwarf2_section_info line;
223 struct dwarf2_section_info loc;
224 struct dwarf2_section_info macinfo;
225 struct dwarf2_section_info macro;
226 struct dwarf2_section_info str;
227 struct dwarf2_section_info ranges;
228 struct dwarf2_section_info addr;
229 struct dwarf2_section_info frame;
230 struct dwarf2_section_info eh_frame;
231 struct dwarf2_section_info gdb_index;
233 VEC (dwarf2_section_info_def) *types;
236 struct objfile *objfile;
238 /* Table of all the compilation units. This is used to locate
239 the target compilation unit of a particular reference. */
240 struct dwarf2_per_cu_data **all_comp_units;
242 /* The number of compilation units in ALL_COMP_UNITS. */
245 /* The number of .debug_types-related CUs. */
248 /* The number of elements allocated in all_type_units.
249 If there are skeleton-less TUs, we add them to all_type_units lazily. */
250 int n_allocated_type_units;
252 /* The .debug_types-related CUs (TUs).
253 This is stored in malloc space because we may realloc it. */
254 struct signatured_type **all_type_units;
256 /* Table of struct type_unit_group objects.
257 The hash key is the DW_AT_stmt_list value. */
258 htab_t type_unit_groups;
260 /* A table mapping .debug_types signatures to its signatured_type entry.
261 This is NULL if the .debug_types section hasn't been read in yet. */
262 htab_t signatured_types;
264 /* Type unit statistics, to see how well the scaling improvements
266 struct tu_stats tu_stats;
268 /* A chain of compilation units that are currently read in, so that
269 they can be freed later. */
270 struct dwarf2_per_cu_data *read_in_chain;
272 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
273 This is NULL if the table hasn't been allocated yet. */
276 /* Non-zero if we've check for whether there is a DWP file. */
279 /* The DWP file if there is one, or NULL. */
280 struct dwp_file *dwp_file;
282 /* The shared '.dwz' file, if one exists. This is used when the
283 original data was compressed using 'dwz -m'. */
284 struct dwz_file *dwz_file;
286 /* A flag indicating wether this objfile has a section loaded at a
288 int has_section_at_zero;
290 /* True if we are using the mapped index,
291 or we are faking it for OBJF_READNOW's sake. */
292 unsigned char using_index;
294 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
295 struct mapped_index *index_table;
297 /* When using index_table, this keeps track of all quick_file_names entries.
298 TUs typically share line table entries with a CU, so we maintain a
299 separate table of all line table entries to support the sharing.
300 Note that while there can be way more TUs than CUs, we've already
301 sorted all the TUs into "type unit groups", grouped by their
302 DW_AT_stmt_list value. Therefore the only sharing done here is with a
303 CU and its associated TU group if there is one. */
304 htab_t quick_file_names_table;
306 /* Set during partial symbol reading, to prevent queueing of full
308 int reading_partial_symbols;
310 /* Table mapping type DIEs to their struct type *.
311 This is NULL if not allocated yet.
312 The mapping is done via (CU/TU + DIE offset) -> type. */
313 htab_t die_type_hash;
315 /* The CUs we recently read. */
316 VEC (dwarf2_per_cu_ptr) *just_read_cus;
318 /* Table containing line_header indexed by offset and offset_in_dwz. */
319 htab_t line_header_hash;
322 static struct dwarf2_per_objfile *dwarf2_per_objfile;
324 /* Default names of the debugging sections. */
326 /* Note that if the debugging section has been compressed, it might
327 have a name like .zdebug_info. */
329 static const struct dwarf2_debug_sections dwarf2_elf_names =
331 { ".debug_info", ".zdebug_info" },
332 { ".debug_abbrev", ".zdebug_abbrev" },
333 { ".debug_line", ".zdebug_line" },
334 { ".debug_loc", ".zdebug_loc" },
335 { ".debug_macinfo", ".zdebug_macinfo" },
336 { ".debug_macro", ".zdebug_macro" },
337 { ".debug_str", ".zdebug_str" },
338 { ".debug_ranges", ".zdebug_ranges" },
339 { ".debug_types", ".zdebug_types" },
340 { ".debug_addr", ".zdebug_addr" },
341 { ".debug_frame", ".zdebug_frame" },
342 { ".eh_frame", NULL },
343 { ".gdb_index", ".zgdb_index" },
347 /* List of DWO/DWP sections. */
349 static const struct dwop_section_names
351 struct dwarf2_section_names abbrev_dwo;
352 struct dwarf2_section_names info_dwo;
353 struct dwarf2_section_names line_dwo;
354 struct dwarf2_section_names loc_dwo;
355 struct dwarf2_section_names macinfo_dwo;
356 struct dwarf2_section_names macro_dwo;
357 struct dwarf2_section_names str_dwo;
358 struct dwarf2_section_names str_offsets_dwo;
359 struct dwarf2_section_names types_dwo;
360 struct dwarf2_section_names cu_index;
361 struct dwarf2_section_names tu_index;
365 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
366 { ".debug_info.dwo", ".zdebug_info.dwo" },
367 { ".debug_line.dwo", ".zdebug_line.dwo" },
368 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
369 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
370 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
371 { ".debug_str.dwo", ".zdebug_str.dwo" },
372 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
373 { ".debug_types.dwo", ".zdebug_types.dwo" },
374 { ".debug_cu_index", ".zdebug_cu_index" },
375 { ".debug_tu_index", ".zdebug_tu_index" },
378 /* local data types */
380 /* The data in a compilation unit header, after target2host
381 translation, looks like this. */
382 struct comp_unit_head
386 unsigned char addr_size;
387 unsigned char signed_addr_p;
388 sect_offset abbrev_offset;
390 /* Size of file offsets; either 4 or 8. */
391 unsigned int offset_size;
393 /* Size of the length field; either 4 or 12. */
394 unsigned int initial_length_size;
396 /* Offset to the first byte of this compilation unit header in the
397 .debug_info section, for resolving relative reference dies. */
400 /* Offset to first die in this cu from the start of the cu.
401 This will be the first byte following the compilation unit header. */
402 cu_offset first_die_offset;
405 /* Type used for delaying computation of method physnames.
406 See comments for compute_delayed_physnames. */
407 struct delayed_method_info
409 /* The type to which the method is attached, i.e., its parent class. */
412 /* The index of the method in the type's function fieldlists. */
415 /* The index of the method in the fieldlist. */
418 /* The name of the DIE. */
421 /* The DIE associated with this method. */
422 struct die_info *die;
425 typedef struct delayed_method_info delayed_method_info;
426 DEF_VEC_O (delayed_method_info);
428 /* Internal state when decoding a particular compilation unit. */
431 /* The objfile containing this compilation unit. */
432 struct objfile *objfile;
434 /* The header of the compilation unit. */
435 struct comp_unit_head header;
437 /* Base address of this compilation unit. */
438 CORE_ADDR base_address;
440 /* Non-zero if base_address has been set. */
443 /* The language we are debugging. */
444 enum language language;
445 const struct language_defn *language_defn;
447 const char *producer;
449 /* The generic symbol table building routines have separate lists for
450 file scope symbols and all all other scopes (local scopes). So
451 we need to select the right one to pass to add_symbol_to_list().
452 We do it by keeping a pointer to the correct list in list_in_scope.
454 FIXME: The original dwarf code just treated the file scope as the
455 first local scope, and all other local scopes as nested local
456 scopes, and worked fine. Check to see if we really need to
457 distinguish these in buildsym.c. */
458 struct pending **list_in_scope;
460 /* The abbrev table for this CU.
461 Normally this points to the abbrev table in the objfile.
462 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
463 struct abbrev_table *abbrev_table;
465 /* Hash table holding all the loaded partial DIEs
466 with partial_die->offset.SECT_OFF as hash. */
469 /* Storage for things with the same lifetime as this read-in compilation
470 unit, including partial DIEs. */
471 struct obstack comp_unit_obstack;
473 /* When multiple dwarf2_cu structures are living in memory, this field
474 chains them all together, so that they can be released efficiently.
475 We will probably also want a generation counter so that most-recently-used
476 compilation units are cached... */
477 struct dwarf2_per_cu_data *read_in_chain;
479 /* Backlink to our per_cu entry. */
480 struct dwarf2_per_cu_data *per_cu;
482 /* How many compilation units ago was this CU last referenced? */
485 /* A hash table of DIE cu_offset for following references with
486 die_info->offset.sect_off as hash. */
489 /* Full DIEs if read in. */
490 struct die_info *dies;
492 /* A set of pointers to dwarf2_per_cu_data objects for compilation
493 units referenced by this one. Only set during full symbol processing;
494 partial symbol tables do not have dependencies. */
497 /* Header data from the line table, during full symbol processing. */
498 struct line_header *line_header;
500 /* A list of methods which need to have physnames computed
501 after all type information has been read. */
502 VEC (delayed_method_info) *method_list;
504 /* To be copied to symtab->call_site_htab. */
505 htab_t call_site_htab;
507 /* Non-NULL if this CU came from a DWO file.
508 There is an invariant here that is important to remember:
509 Except for attributes copied from the top level DIE in the "main"
510 (or "stub") file in preparation for reading the DWO file
511 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
512 Either there isn't a DWO file (in which case this is NULL and the point
513 is moot), or there is and either we're not going to read it (in which
514 case this is NULL) or there is and we are reading it (in which case this
516 struct dwo_unit *dwo_unit;
518 /* The DW_AT_addr_base attribute if present, zero otherwise
519 (zero is a valid value though).
520 Note this value comes from the Fission stub CU/TU's DIE. */
523 /* The DW_AT_ranges_base attribute if present, zero otherwise
524 (zero is a valid value though).
525 Note this value comes from the Fission stub CU/TU's DIE.
526 Also note that the value is zero in the non-DWO case so this value can
527 be used without needing to know whether DWO files are in use or not.
528 N.B. This does not apply to DW_AT_ranges appearing in
529 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
530 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
531 DW_AT_ranges_base *would* have to be applied, and we'd have to care
532 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
533 ULONGEST ranges_base;
535 /* Mark used when releasing cached dies. */
536 unsigned int mark : 1;
538 /* This CU references .debug_loc. See the symtab->locations_valid field.
539 This test is imperfect as there may exist optimized debug code not using
540 any location list and still facing inlining issues if handled as
541 unoptimized code. For a future better test see GCC PR other/32998. */
542 unsigned int has_loclist : 1;
544 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
545 if all the producer_is_* fields are valid. This information is cached
546 because profiling CU expansion showed excessive time spent in
547 producer_is_gxx_lt_4_6. */
548 unsigned int checked_producer : 1;
549 unsigned int producer_is_gxx_lt_4_6 : 1;
550 unsigned int producer_is_gcc_lt_4_3 : 1;
551 unsigned int producer_is_icc : 1;
553 /* When set, the file that we're processing is known to have
554 debugging info for C++ namespaces. GCC 3.3.x did not produce
555 this information, but later versions do. */
557 unsigned int processing_has_namespace_info : 1;
560 /* Persistent data held for a compilation unit, even when not
561 processing it. We put a pointer to this structure in the
562 read_symtab_private field of the psymtab. */
564 struct dwarf2_per_cu_data
566 /* The start offset and length of this compilation unit.
567 NOTE: Unlike comp_unit_head.length, this length includes
569 If the DIE refers to a DWO file, this is always of the original die,
574 /* Flag indicating this compilation unit will be read in before
575 any of the current compilation units are processed. */
576 unsigned int queued : 1;
578 /* This flag will be set when reading partial DIEs if we need to load
579 absolutely all DIEs for this compilation unit, instead of just the ones
580 we think are interesting. It gets set if we look for a DIE in the
581 hash table and don't find it. */
582 unsigned int load_all_dies : 1;
584 /* Non-zero if this CU is from .debug_types.
585 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
587 unsigned int is_debug_types : 1;
589 /* Non-zero if this CU is from the .dwz file. */
590 unsigned int is_dwz : 1;
592 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
593 This flag is only valid if is_debug_types is true.
594 We can't read a CU directly from a DWO file: There are required
595 attributes in the stub. */
596 unsigned int reading_dwo_directly : 1;
598 /* Non-zero if the TU has been read.
599 This is used to assist the "Stay in DWO Optimization" for Fission:
600 When reading a DWO, it's faster to read TUs from the DWO instead of
601 fetching them from random other DWOs (due to comdat folding).
602 If the TU has already been read, the optimization is unnecessary
603 (and unwise - we don't want to change where gdb thinks the TU lives
605 This flag is only valid if is_debug_types is true. */
606 unsigned int tu_read : 1;
608 /* The section this CU/TU lives in.
609 If the DIE refers to a DWO file, this is always the original die,
611 struct dwarf2_section_info *section;
613 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
614 of the CU cache it gets reset to NULL again. This is left as NULL for
615 dummy CUs (a CU header, but nothing else). */
616 struct dwarf2_cu *cu;
618 /* The corresponding objfile.
619 Normally we can get the objfile from dwarf2_per_objfile.
620 However we can enter this file with just a "per_cu" handle. */
621 struct objfile *objfile;
623 /* When dwarf2_per_objfile->using_index is true, the 'quick' field
624 is active. Otherwise, the 'psymtab' field is active. */
627 /* The partial symbol table associated with this compilation unit,
628 or NULL for unread partial units. */
629 struct partial_symtab *psymtab;
631 /* Data needed by the "quick" functions. */
632 struct dwarf2_per_cu_quick_data *quick;
635 /* The CUs we import using DW_TAG_imported_unit. This is filled in
636 while reading psymtabs, used to compute the psymtab dependencies,
637 and then cleared. Then it is filled in again while reading full
638 symbols, and only deleted when the objfile is destroyed.
640 This is also used to work around a difference between the way gold
641 generates .gdb_index version <=7 and the way gdb does. Arguably this
642 is a gold bug. For symbols coming from TUs, gold records in the index
643 the CU that includes the TU instead of the TU itself. This breaks
644 dw2_lookup_symbol: It assumes that if the index says symbol X lives
645 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
646 will find X. Alas TUs live in their own symtab, so after expanding CU Y
647 we need to look in TU Z to find X. Fortunately, this is akin to
648 DW_TAG_imported_unit, so we just use the same mechanism: For
649 .gdb_index version <=7 this also records the TUs that the CU referred
650 to. Concurrently with this change gdb was modified to emit version 8
651 indices so we only pay a price for gold generated indices.
652 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
653 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
656 /* Entry in the signatured_types hash table. */
658 struct signatured_type
660 /* The "per_cu" object of this type.
661 This struct is used iff per_cu.is_debug_types.
662 N.B.: This is the first member so that it's easy to convert pointers
664 struct dwarf2_per_cu_data per_cu;
666 /* The type's signature. */
669 /* Offset in the TU of the type's DIE, as read from the TU header.
670 If this TU is a DWO stub and the definition lives in a DWO file
671 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
672 cu_offset type_offset_in_tu;
674 /* Offset in the section of the type's DIE.
675 If the definition lives in a DWO file, this is the offset in the
676 .debug_types.dwo section.
677 The value is zero until the actual value is known.
678 Zero is otherwise not a valid section offset. */
679 sect_offset type_offset_in_section;
681 /* Type units are grouped by their DW_AT_stmt_list entry so that they
682 can share them. This points to the containing symtab. */
683 struct type_unit_group *type_unit_group;
686 The first time we encounter this type we fully read it in and install it
687 in the symbol tables. Subsequent times we only need the type. */
690 /* Containing DWO unit.
691 This field is valid iff per_cu.reading_dwo_directly. */
692 struct dwo_unit *dwo_unit;
695 typedef struct signatured_type *sig_type_ptr;
696 DEF_VEC_P (sig_type_ptr);
698 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
699 This includes type_unit_group and quick_file_names. */
701 struct stmt_list_hash
703 /* The DWO unit this table is from or NULL if there is none. */
704 struct dwo_unit *dwo_unit;
706 /* Offset in .debug_line or .debug_line.dwo. */
707 sect_offset line_offset;
710 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
711 an object of this type. */
713 struct type_unit_group
715 /* dwarf2read.c's main "handle" on a TU symtab.
716 To simplify things we create an artificial CU that "includes" all the
717 type units using this stmt_list so that the rest of the code still has
718 a "per_cu" handle on the symtab.
719 This PER_CU is recognized by having no section. */
720 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
721 struct dwarf2_per_cu_data per_cu;
723 /* The TUs that share this DW_AT_stmt_list entry.
724 This is added to while parsing type units to build partial symtabs,
725 and is deleted afterwards and not used again. */
726 VEC (sig_type_ptr) *tus;
728 /* The compunit symtab.
729 Type units in a group needn't all be defined in the same source file,
730 so we create an essentially anonymous symtab as the compunit symtab. */
731 struct compunit_symtab *compunit_symtab;
733 /* The data used to construct the hash key. */
734 struct stmt_list_hash hash;
736 /* The number of symtabs from the line header.
737 The value here must match line_header.num_file_names. */
738 unsigned int num_symtabs;
740 /* The symbol tables for this TU (obtained from the files listed in
742 WARNING: The order of entries here must match the order of entries
743 in the line header. After the first TU using this type_unit_group, the
744 line header for the subsequent TUs is recreated from this. This is done
745 because we need to use the same symtabs for each TU using the same
746 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
747 there's no guarantee the line header doesn't have duplicate entries. */
748 struct symtab **symtabs;
751 /* These sections are what may appear in a (real or virtual) DWO file. */
755 struct dwarf2_section_info abbrev;
756 struct dwarf2_section_info line;
757 struct dwarf2_section_info loc;
758 struct dwarf2_section_info macinfo;
759 struct dwarf2_section_info macro;
760 struct dwarf2_section_info str;
761 struct dwarf2_section_info str_offsets;
762 /* In the case of a virtual DWO file, these two are unused. */
763 struct dwarf2_section_info info;
764 VEC (dwarf2_section_info_def) *types;
767 /* CUs/TUs in DWP/DWO files. */
771 /* Backlink to the containing struct dwo_file. */
772 struct dwo_file *dwo_file;
774 /* The "id" that distinguishes this CU/TU.
775 .debug_info calls this "dwo_id", .debug_types calls this "signature".
776 Since signatures came first, we stick with it for consistency. */
779 /* The section this CU/TU lives in, in the DWO file. */
780 struct dwarf2_section_info *section;
782 /* Same as dwarf2_per_cu_data:{offset,length} but in the DWO section. */
786 /* For types, offset in the type's DIE of the type defined by this TU. */
787 cu_offset type_offset_in_tu;
790 /* include/dwarf2.h defines the DWP section codes.
791 It defines a max value but it doesn't define a min value, which we
792 use for error checking, so provide one. */
794 enum dwp_v2_section_ids
799 /* Data for one DWO file.
801 This includes virtual DWO files (a virtual DWO file is a DWO file as it
802 appears in a DWP file). DWP files don't really have DWO files per se -
803 comdat folding of types "loses" the DWO file they came from, and from
804 a high level view DWP files appear to contain a mass of random types.
805 However, to maintain consistency with the non-DWP case we pretend DWP
806 files contain virtual DWO files, and we assign each TU with one virtual
807 DWO file (generally based on the line and abbrev section offsets -
808 a heuristic that seems to work in practice). */
812 /* The DW_AT_GNU_dwo_name attribute.
813 For virtual DWO files the name is constructed from the section offsets
814 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
815 from related CU+TUs. */
816 const char *dwo_name;
818 /* The DW_AT_comp_dir attribute. */
819 const char *comp_dir;
821 /* The bfd, when the file is open. Otherwise this is NULL.
822 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
825 /* The sections that make up this DWO file.
826 Remember that for virtual DWO files in DWP V2, these are virtual
827 sections (for lack of a better name). */
828 struct dwo_sections sections;
830 /* The CU in the file.
831 We only support one because having more than one requires hacking the
832 dwo_name of each to match, which is highly unlikely to happen.
833 Doing this means all TUs can share comp_dir: We also assume that
834 DW_AT_comp_dir across all TUs in a DWO file will be identical. */
837 /* Table of TUs in the file.
838 Each element is a struct dwo_unit. */
842 /* These sections are what may appear in a DWP file. */
846 /* These are used by both DWP version 1 and 2. */
847 struct dwarf2_section_info str;
848 struct dwarf2_section_info cu_index;
849 struct dwarf2_section_info tu_index;
851 /* These are only used by DWP version 2 files.
852 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
853 sections are referenced by section number, and are not recorded here.
854 In DWP version 2 there is at most one copy of all these sections, each
855 section being (effectively) comprised of the concatenation of all of the
856 individual sections that exist in the version 1 format.
857 To keep the code simple we treat each of these concatenated pieces as a
858 section itself (a virtual section?). */
859 struct dwarf2_section_info abbrev;
860 struct dwarf2_section_info info;
861 struct dwarf2_section_info line;
862 struct dwarf2_section_info loc;
863 struct dwarf2_section_info macinfo;
864 struct dwarf2_section_info macro;
865 struct dwarf2_section_info str_offsets;
866 struct dwarf2_section_info types;
869 /* These sections are what may appear in a virtual DWO file in DWP version 1.
870 A virtual DWO file is a DWO file as it appears in a DWP file. */
872 struct virtual_v1_dwo_sections
874 struct dwarf2_section_info abbrev;
875 struct dwarf2_section_info line;
876 struct dwarf2_section_info loc;
877 struct dwarf2_section_info macinfo;
878 struct dwarf2_section_info macro;
879 struct dwarf2_section_info str_offsets;
880 /* Each DWP hash table entry records one CU or one TU.
881 That is recorded here, and copied to dwo_unit.section. */
882 struct dwarf2_section_info info_or_types;
885 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
886 In version 2, the sections of the DWO files are concatenated together
887 and stored in one section of that name. Thus each ELF section contains
888 several "virtual" sections. */
890 struct virtual_v2_dwo_sections
892 bfd_size_type abbrev_offset;
893 bfd_size_type abbrev_size;
895 bfd_size_type line_offset;
896 bfd_size_type line_size;
898 bfd_size_type loc_offset;
899 bfd_size_type loc_size;
901 bfd_size_type macinfo_offset;
902 bfd_size_type macinfo_size;
904 bfd_size_type macro_offset;
905 bfd_size_type macro_size;
907 bfd_size_type str_offsets_offset;
908 bfd_size_type str_offsets_size;
910 /* Each DWP hash table entry records one CU or one TU.
911 That is recorded here, and copied to dwo_unit.section. */
912 bfd_size_type info_or_types_offset;
913 bfd_size_type info_or_types_size;
916 /* Contents of DWP hash tables. */
918 struct dwp_hash_table
920 uint32_t version, nr_columns;
921 uint32_t nr_units, nr_slots;
922 const gdb_byte *hash_table, *unit_table;
927 const gdb_byte *indices;
931 /* This is indexed by column number and gives the id of the section
933 #define MAX_NR_V2_DWO_SECTIONS \
934 (1 /* .debug_info or .debug_types */ \
935 + 1 /* .debug_abbrev */ \
936 + 1 /* .debug_line */ \
937 + 1 /* .debug_loc */ \
938 + 1 /* .debug_str_offsets */ \
939 + 1 /* .debug_macro or .debug_macinfo */)
940 int section_ids[MAX_NR_V2_DWO_SECTIONS];
941 const gdb_byte *offsets;
942 const gdb_byte *sizes;
947 /* Data for one DWP file. */
951 /* Name of the file. */
954 /* File format version. */
960 /* Section info for this file. */
961 struct dwp_sections sections;
963 /* Table of CUs in the file. */
964 const struct dwp_hash_table *cus;
966 /* Table of TUs in the file. */
967 const struct dwp_hash_table *tus;
969 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
973 /* Table to map ELF section numbers to their sections.
974 This is only needed for the DWP V1 file format. */
975 unsigned int num_sections;
976 asection **elf_sections;
979 /* This represents a '.dwz' file. */
983 /* A dwz file can only contain a few sections. */
984 struct dwarf2_section_info abbrev;
985 struct dwarf2_section_info info;
986 struct dwarf2_section_info str;
987 struct dwarf2_section_info line;
988 struct dwarf2_section_info macro;
989 struct dwarf2_section_info gdb_index;
995 /* Struct used to pass misc. parameters to read_die_and_children, et
996 al. which are used for both .debug_info and .debug_types dies.
997 All parameters here are unchanging for the life of the call. This
998 struct exists to abstract away the constant parameters of die reading. */
1000 struct die_reader_specs
1002 /* The bfd of die_section. */
1005 /* The CU of the DIE we are parsing. */
1006 struct dwarf2_cu *cu;
1008 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
1009 struct dwo_file *dwo_file;
1011 /* The section the die comes from.
1012 This is either .debug_info or .debug_types, or the .dwo variants. */
1013 struct dwarf2_section_info *die_section;
1015 /* die_section->buffer. */
1016 const gdb_byte *buffer;
1018 /* The end of the buffer. */
1019 const gdb_byte *buffer_end;
1021 /* The value of the DW_AT_comp_dir attribute. */
1022 const char *comp_dir;
1025 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1026 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1027 const gdb_byte *info_ptr,
1028 struct die_info *comp_unit_die,
1035 unsigned int dir_index;
1036 unsigned int mod_time;
1037 unsigned int length;
1038 /* Non-zero if referenced by the Line Number Program. */
1040 /* The associated symbol table, if any. */
1041 struct symtab *symtab;
1044 /* The line number information for a compilation unit (found in the
1045 .debug_line section) begins with a "statement program header",
1046 which contains the following information. */
1049 /* Offset of line number information in .debug_line section. */
1052 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1053 unsigned offset_in_dwz : 1;
1055 unsigned int total_length;
1056 unsigned short version;
1057 unsigned int header_length;
1058 unsigned char minimum_instruction_length;
1059 unsigned char maximum_ops_per_instruction;
1060 unsigned char default_is_stmt;
1062 unsigned char line_range;
1063 unsigned char opcode_base;
1065 /* standard_opcode_lengths[i] is the number of operands for the
1066 standard opcode whose value is i. This means that
1067 standard_opcode_lengths[0] is unused, and the last meaningful
1068 element is standard_opcode_lengths[opcode_base - 1]. */
1069 unsigned char *standard_opcode_lengths;
1071 /* The include_directories table. NOTE! These strings are not
1072 allocated with xmalloc; instead, they are pointers into
1073 debug_line_buffer. If you try to free them, `free' will get
1075 unsigned int num_include_dirs, include_dirs_size;
1076 const char **include_dirs;
1078 /* The file_names table. NOTE! These strings are not allocated
1079 with xmalloc; instead, they are pointers into debug_line_buffer.
1080 Don't try to free them directly. */
1081 unsigned int num_file_names, file_names_size;
1082 struct file_entry *file_names;
1084 /* The start and end of the statement program following this
1085 header. These point into dwarf2_per_objfile->line_buffer. */
1086 const gdb_byte *statement_program_start, *statement_program_end;
1089 /* When we construct a partial symbol table entry we only
1090 need this much information. */
1091 struct partial_die_info
1093 /* Offset of this DIE. */
1096 /* DWARF-2 tag for this DIE. */
1097 ENUM_BITFIELD(dwarf_tag) tag : 16;
1099 /* Assorted flags describing the data found in this DIE. */
1100 unsigned int has_children : 1;
1101 unsigned int is_external : 1;
1102 unsigned int is_declaration : 1;
1103 unsigned int has_type : 1;
1104 unsigned int has_specification : 1;
1105 unsigned int has_pc_info : 1;
1106 unsigned int may_be_inlined : 1;
1108 /* Flag set if the SCOPE field of this structure has been
1110 unsigned int scope_set : 1;
1112 /* Flag set if the DIE has a byte_size attribute. */
1113 unsigned int has_byte_size : 1;
1115 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1116 unsigned int has_const_value : 1;
1118 /* Flag set if any of the DIE's children are template arguments. */
1119 unsigned int has_template_arguments : 1;
1121 /* Flag set if fixup_partial_die has been called on this die. */
1122 unsigned int fixup_called : 1;
1124 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1125 unsigned int is_dwz : 1;
1127 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1128 unsigned int spec_is_dwz : 1;
1130 /* The name of this DIE. Normally the value of DW_AT_name, but
1131 sometimes a default name for unnamed DIEs. */
1134 /* The linkage name, if present. */
1135 const char *linkage_name;
1137 /* The scope to prepend to our children. This is generally
1138 allocated on the comp_unit_obstack, so will disappear
1139 when this compilation unit leaves the cache. */
1142 /* Some data associated with the partial DIE. The tag determines
1143 which field is live. */
1146 /* The location description associated with this DIE, if any. */
1147 struct dwarf_block *locdesc;
1148 /* The offset of an import, for DW_TAG_imported_unit. */
1152 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1156 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1157 DW_AT_sibling, if any. */
1158 /* NOTE: This member isn't strictly necessary, read_partial_die could
1159 return DW_AT_sibling values to its caller load_partial_dies. */
1160 const gdb_byte *sibling;
1162 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1163 DW_AT_specification (or DW_AT_abstract_origin or
1164 DW_AT_extension). */
1165 sect_offset spec_offset;
1167 /* Pointers to this DIE's parent, first child, and next sibling,
1169 struct partial_die_info *die_parent, *die_child, *die_sibling;
1172 /* This data structure holds the information of an abbrev. */
1175 unsigned int number; /* number identifying abbrev */
1176 enum dwarf_tag tag; /* dwarf tag */
1177 unsigned short has_children; /* boolean */
1178 unsigned short num_attrs; /* number of attributes */
1179 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1180 struct abbrev_info *next; /* next in chain */
1185 ENUM_BITFIELD(dwarf_attribute) name : 16;
1186 ENUM_BITFIELD(dwarf_form) form : 16;
1189 /* Size of abbrev_table.abbrev_hash_table. */
1190 #define ABBREV_HASH_SIZE 121
1192 /* Top level data structure to contain an abbreviation table. */
1196 /* Where the abbrev table came from.
1197 This is used as a sanity check when the table is used. */
1200 /* Storage for the abbrev table. */
1201 struct obstack abbrev_obstack;
1203 /* Hash table of abbrevs.
1204 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1205 It could be statically allocated, but the previous code didn't so we
1207 struct abbrev_info **abbrevs;
1210 /* Attributes have a name and a value. */
1213 ENUM_BITFIELD(dwarf_attribute) name : 16;
1214 ENUM_BITFIELD(dwarf_form) form : 15;
1216 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1217 field should be in u.str (existing only for DW_STRING) but it is kept
1218 here for better struct attribute alignment. */
1219 unsigned int string_is_canonical : 1;
1224 struct dwarf_block *blk;
1233 /* This data structure holds a complete die structure. */
1236 /* DWARF-2 tag for this DIE. */
1237 ENUM_BITFIELD(dwarf_tag) tag : 16;
1239 /* Number of attributes */
1240 unsigned char num_attrs;
1242 /* True if we're presently building the full type name for the
1243 type derived from this DIE. */
1244 unsigned char building_fullname : 1;
1246 /* True if this die is in process. PR 16581. */
1247 unsigned char in_process : 1;
1250 unsigned int abbrev;
1252 /* Offset in .debug_info or .debug_types section. */
1255 /* The dies in a compilation unit form an n-ary tree. PARENT
1256 points to this die's parent; CHILD points to the first child of
1257 this node; and all the children of a given node are chained
1258 together via their SIBLING fields. */
1259 struct die_info *child; /* Its first child, if any. */
1260 struct die_info *sibling; /* Its next sibling, if any. */
1261 struct die_info *parent; /* Its parent, if any. */
1263 /* An array of attributes, with NUM_ATTRS elements. There may be
1264 zero, but it's not common and zero-sized arrays are not
1265 sufficiently portable C. */
1266 struct attribute attrs[1];
1269 /* Get at parts of an attribute structure. */
1271 #define DW_STRING(attr) ((attr)->u.str)
1272 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1273 #define DW_UNSND(attr) ((attr)->u.unsnd)
1274 #define DW_BLOCK(attr) ((attr)->u.blk)
1275 #define DW_SND(attr) ((attr)->u.snd)
1276 #define DW_ADDR(attr) ((attr)->u.addr)
1277 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1279 /* Blocks are a bunch of untyped bytes. */
1284 /* Valid only if SIZE is not zero. */
1285 const gdb_byte *data;
1288 #ifndef ATTR_ALLOC_CHUNK
1289 #define ATTR_ALLOC_CHUNK 4
1292 /* Allocate fields for structs, unions and enums in this size. */
1293 #ifndef DW_FIELD_ALLOC_CHUNK
1294 #define DW_FIELD_ALLOC_CHUNK 4
1297 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1298 but this would require a corresponding change in unpack_field_as_long
1300 static int bits_per_byte = 8;
1304 struct nextfield *next;
1312 struct nextfnfield *next;
1313 struct fn_field fnfield;
1320 struct nextfnfield *head;
1323 struct typedef_field_list
1325 struct typedef_field field;
1326 struct typedef_field_list *next;
1329 /* The routines that read and process dies for a C struct or C++ class
1330 pass lists of data member fields and lists of member function fields
1331 in an instance of a field_info structure, as defined below. */
1334 /* List of data member and baseclasses fields. */
1335 struct nextfield *fields, *baseclasses;
1337 /* Number of fields (including baseclasses). */
1340 /* Number of baseclasses. */
1343 /* Set if the accesibility of one of the fields is not public. */
1344 int non_public_fields;
1346 /* Member function fields array, entries are allocated in the order they
1347 are encountered in the object file. */
1348 struct nextfnfield *fnfields;
1350 /* Member function fieldlist array, contains name of possibly overloaded
1351 member function, number of overloaded member functions and a pointer
1352 to the head of the member function field chain. */
1353 struct fnfieldlist *fnfieldlists;
1355 /* Number of entries in the fnfieldlists array. */
1358 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1359 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1360 struct typedef_field_list *typedef_field_list;
1361 unsigned typedef_field_list_count;
1364 /* One item on the queue of compilation units to read in full symbols
1366 struct dwarf2_queue_item
1368 struct dwarf2_per_cu_data *per_cu;
1369 enum language pretend_language;
1370 struct dwarf2_queue_item *next;
1373 /* The current queue. */
1374 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1376 /* Loaded secondary compilation units are kept in memory until they
1377 have not been referenced for the processing of this many
1378 compilation units. Set this to zero to disable caching. Cache
1379 sizes of up to at least twenty will improve startup time for
1380 typical inter-CU-reference binaries, at an obvious memory cost. */
1381 static int dwarf_max_cache_age = 5;
1383 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1384 struct cmd_list_element *c, const char *value)
1386 fprintf_filtered (file, _("The upper bound on the age of cached "
1387 "DWARF compilation units is %s.\n"),
1391 /* local function prototypes */
1393 static const char *get_section_name (const struct dwarf2_section_info *);
1395 static const char *get_section_file_name (const struct dwarf2_section_info *);
1397 static void dwarf2_locate_sections (bfd *, asection *, void *);
1399 static void dwarf2_find_base_address (struct die_info *die,
1400 struct dwarf2_cu *cu);
1402 static struct partial_symtab *create_partial_symtab
1403 (struct dwarf2_per_cu_data *per_cu, const char *name);
1405 static void dwarf2_build_psymtabs_hard (struct objfile *);
1407 static void scan_partial_symbols (struct partial_die_info *,
1408 CORE_ADDR *, CORE_ADDR *,
1409 int, struct dwarf2_cu *);
1411 static void add_partial_symbol (struct partial_die_info *,
1412 struct dwarf2_cu *);
1414 static void add_partial_namespace (struct partial_die_info *pdi,
1415 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1416 int set_addrmap, struct dwarf2_cu *cu);
1418 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1419 CORE_ADDR *highpc, int set_addrmap,
1420 struct dwarf2_cu *cu);
1422 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1423 struct dwarf2_cu *cu);
1425 static void add_partial_subprogram (struct partial_die_info *pdi,
1426 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1427 int need_pc, struct dwarf2_cu *cu);
1429 static void dwarf2_read_symtab (struct partial_symtab *,
1432 static void psymtab_to_symtab_1 (struct partial_symtab *);
1434 static struct abbrev_info *abbrev_table_lookup_abbrev
1435 (const struct abbrev_table *, unsigned int);
1437 static struct abbrev_table *abbrev_table_read_table
1438 (struct dwarf2_section_info *, sect_offset);
1440 static void abbrev_table_free (struct abbrev_table *);
1442 static void abbrev_table_free_cleanup (void *);
1444 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1445 struct dwarf2_section_info *);
1447 static void dwarf2_free_abbrev_table (void *);
1449 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1451 static struct partial_die_info *load_partial_dies
1452 (const struct die_reader_specs *, const gdb_byte *, int);
1454 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1455 struct partial_die_info *,
1456 struct abbrev_info *,
1460 static struct partial_die_info *find_partial_die (sect_offset, int,
1461 struct dwarf2_cu *);
1463 static void fixup_partial_die (struct partial_die_info *,
1464 struct dwarf2_cu *);
1466 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1467 struct attribute *, struct attr_abbrev *,
1470 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1472 static int read_1_signed_byte (bfd *, const gdb_byte *);
1474 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1476 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1478 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1480 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1483 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1485 static LONGEST read_checked_initial_length_and_offset
1486 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1487 unsigned int *, unsigned int *);
1489 static LONGEST read_offset (bfd *, const gdb_byte *,
1490 const struct comp_unit_head *,
1493 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1495 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1498 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1500 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1502 static const char *read_indirect_string (bfd *, const gdb_byte *,
1503 const struct comp_unit_head *,
1506 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1508 static ULONGEST read_unsigned_leb128 (bfd *, const gdb_byte *, unsigned int *);
1510 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1512 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1516 static const char *read_str_index (const struct die_reader_specs *reader,
1517 ULONGEST str_index);
1519 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1521 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1522 struct dwarf2_cu *);
1524 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1527 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1528 struct dwarf2_cu *cu);
1530 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1531 struct dwarf2_cu *cu);
1533 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1535 static struct die_info *die_specification (struct die_info *die,
1536 struct dwarf2_cu **);
1538 static void free_line_header (struct line_header *lh);
1540 static struct line_header *dwarf_decode_line_header (unsigned int offset,
1541 struct dwarf2_cu *cu);
1543 static void dwarf_decode_lines (struct line_header *, const char *,
1544 struct dwarf2_cu *, struct partial_symtab *,
1545 CORE_ADDR, int decode_mapping);
1547 static void dwarf2_start_subfile (const char *, const char *);
1549 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1550 const char *, const char *,
1553 static struct symbol *new_symbol (struct die_info *, struct type *,
1554 struct dwarf2_cu *);
1556 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1557 struct dwarf2_cu *, struct symbol *);
1559 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1560 struct dwarf2_cu *);
1562 static void dwarf2_const_value_attr (const struct attribute *attr,
1565 struct obstack *obstack,
1566 struct dwarf2_cu *cu, LONGEST *value,
1567 const gdb_byte **bytes,
1568 struct dwarf2_locexpr_baton **baton);
1570 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1572 static int need_gnat_info (struct dwarf2_cu *);
1574 static struct type *die_descriptive_type (struct die_info *,
1575 struct dwarf2_cu *);
1577 static void set_descriptive_type (struct type *, struct die_info *,
1578 struct dwarf2_cu *);
1580 static struct type *die_containing_type (struct die_info *,
1581 struct dwarf2_cu *);
1583 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1584 struct dwarf2_cu *);
1586 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1588 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1590 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1592 static char *typename_concat (struct obstack *obs, const char *prefix,
1593 const char *suffix, int physname,
1594 struct dwarf2_cu *cu);
1596 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1598 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1600 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1602 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1604 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1606 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1607 struct dwarf2_cu *, struct partial_symtab *);
1609 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1610 values. Keep the items ordered with increasing constraints compliance. */
1613 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1614 PC_BOUNDS_NOT_PRESENT,
1616 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1617 were present but they do not form a valid range of PC addresses. */
1620 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1623 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1627 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1628 CORE_ADDR *, CORE_ADDR *,
1630 struct partial_symtab *);
1632 static void get_scope_pc_bounds (struct die_info *,
1633 CORE_ADDR *, CORE_ADDR *,
1634 struct dwarf2_cu *);
1636 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1637 CORE_ADDR, struct dwarf2_cu *);
1639 static void dwarf2_add_field (struct field_info *, struct die_info *,
1640 struct dwarf2_cu *);
1642 static void dwarf2_attach_fields_to_type (struct field_info *,
1643 struct type *, struct dwarf2_cu *);
1645 static void dwarf2_add_member_fn (struct field_info *,
1646 struct die_info *, struct type *,
1647 struct dwarf2_cu *);
1649 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1651 struct dwarf2_cu *);
1653 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1655 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1657 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1659 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1661 static struct using_direct **using_directives (enum language);
1663 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1665 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1667 static struct type *read_module_type (struct die_info *die,
1668 struct dwarf2_cu *cu);
1670 static const char *namespace_name (struct die_info *die,
1671 int *is_anonymous, struct dwarf2_cu *);
1673 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1675 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1677 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1678 struct dwarf2_cu *);
1680 static struct die_info *read_die_and_siblings_1
1681 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1684 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1685 const gdb_byte *info_ptr,
1686 const gdb_byte **new_info_ptr,
1687 struct die_info *parent);
1689 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1690 struct die_info **, const gdb_byte *,
1693 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1694 struct die_info **, const gdb_byte *,
1697 static void process_die (struct die_info *, struct dwarf2_cu *);
1699 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1702 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1704 static const char *dwarf2_full_name (const char *name,
1705 struct die_info *die,
1706 struct dwarf2_cu *cu);
1708 static const char *dwarf2_physname (const char *name, struct die_info *die,
1709 struct dwarf2_cu *cu);
1711 static struct die_info *dwarf2_extension (struct die_info *die,
1712 struct dwarf2_cu **);
1714 static const char *dwarf_tag_name (unsigned int);
1716 static const char *dwarf_attr_name (unsigned int);
1718 static const char *dwarf_form_name (unsigned int);
1720 static char *dwarf_bool_name (unsigned int);
1722 static const char *dwarf_type_encoding_name (unsigned int);
1724 static struct die_info *sibling_die (struct die_info *);
1726 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1728 static void dump_die_for_error (struct die_info *);
1730 static void dump_die_1 (struct ui_file *, int level, int max_level,
1733 /*static*/ void dump_die (struct die_info *, int max_level);
1735 static void store_in_ref_table (struct die_info *,
1736 struct dwarf2_cu *);
1738 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1740 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1742 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1743 const struct attribute *,
1744 struct dwarf2_cu **);
1746 static struct die_info *follow_die_ref (struct die_info *,
1747 const struct attribute *,
1748 struct dwarf2_cu **);
1750 static struct die_info *follow_die_sig (struct die_info *,
1751 const struct attribute *,
1752 struct dwarf2_cu **);
1754 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1755 struct dwarf2_cu *);
1757 static struct type *get_DW_AT_signature_type (struct die_info *,
1758 const struct attribute *,
1759 struct dwarf2_cu *);
1761 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1763 static void read_signatured_type (struct signatured_type *);
1765 static int attr_to_dynamic_prop (const struct attribute *attr,
1766 struct die_info *die, struct dwarf2_cu *cu,
1767 struct dynamic_prop *prop);
1769 /* memory allocation interface */
1771 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1773 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1775 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1777 static int attr_form_is_block (const struct attribute *);
1779 static int attr_form_is_section_offset (const struct attribute *);
1781 static int attr_form_is_constant (const struct attribute *);
1783 static int attr_form_is_ref (const struct attribute *);
1785 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1786 struct dwarf2_loclist_baton *baton,
1787 const struct attribute *attr);
1789 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1791 struct dwarf2_cu *cu,
1794 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1795 const gdb_byte *info_ptr,
1796 struct abbrev_info *abbrev);
1798 static void free_stack_comp_unit (void *);
1800 static hashval_t partial_die_hash (const void *item);
1802 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1804 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1805 (sect_offset offset, unsigned int offset_in_dwz, struct objfile *objfile);
1807 static void init_one_comp_unit (struct dwarf2_cu *cu,
1808 struct dwarf2_per_cu_data *per_cu);
1810 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1811 struct die_info *comp_unit_die,
1812 enum language pretend_language);
1814 static void free_heap_comp_unit (void *);
1816 static void free_cached_comp_units (void *);
1818 static void age_cached_comp_units (void);
1820 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1822 static struct type *set_die_type (struct die_info *, struct type *,
1823 struct dwarf2_cu *);
1825 static void create_all_comp_units (struct objfile *);
1827 static int create_all_type_units (struct objfile *);
1829 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1832 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1835 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1838 static void dwarf2_add_dependence (struct dwarf2_cu *,
1839 struct dwarf2_per_cu_data *);
1841 static void dwarf2_mark (struct dwarf2_cu *);
1843 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1845 static struct type *get_die_type_at_offset (sect_offset,
1846 struct dwarf2_per_cu_data *);
1848 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1850 static void dwarf2_release_queue (void *dummy);
1852 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1853 enum language pretend_language);
1855 static void process_queue (void);
1857 static void find_file_and_directory (struct die_info *die,
1858 struct dwarf2_cu *cu,
1859 const char **name, const char **comp_dir);
1861 static char *file_full_name (int file, struct line_header *lh,
1862 const char *comp_dir);
1864 static const gdb_byte *read_and_check_comp_unit_head
1865 (struct comp_unit_head *header,
1866 struct dwarf2_section_info *section,
1867 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1868 int is_debug_types_section);
1870 static void init_cutu_and_read_dies
1871 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1872 int use_existing_cu, int keep,
1873 die_reader_func_ftype *die_reader_func, void *data);
1875 static void init_cutu_and_read_dies_simple
1876 (struct dwarf2_per_cu_data *this_cu,
1877 die_reader_func_ftype *die_reader_func, void *data);
1879 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1881 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1883 static struct dwo_unit *lookup_dwo_unit_in_dwp
1884 (struct dwp_file *dwp_file, const char *comp_dir,
1885 ULONGEST signature, int is_debug_types);
1887 static struct dwp_file *get_dwp_file (void);
1889 static struct dwo_unit *lookup_dwo_comp_unit
1890 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1892 static struct dwo_unit *lookup_dwo_type_unit
1893 (struct signatured_type *, const char *, const char *);
1895 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
1897 static void free_dwo_file_cleanup (void *);
1899 static void process_cu_includes (void);
1901 static void check_producer (struct dwarf2_cu *cu);
1903 static void free_line_header_voidp (void *arg);
1905 /* Various complaints about symbol reading that don't abort the process. */
1908 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
1910 complaint (&symfile_complaints,
1911 _("statement list doesn't fit in .debug_line section"));
1915 dwarf2_debug_line_missing_file_complaint (void)
1917 complaint (&symfile_complaints,
1918 _(".debug_line section has line data without a file"));
1922 dwarf2_debug_line_missing_end_sequence_complaint (void)
1924 complaint (&symfile_complaints,
1925 _(".debug_line section has line "
1926 "program sequence without an end"));
1930 dwarf2_complex_location_expr_complaint (void)
1932 complaint (&symfile_complaints, _("location expression too complex"));
1936 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
1939 complaint (&symfile_complaints,
1940 _("const value length mismatch for '%s', got %d, expected %d"),
1945 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
1947 complaint (&symfile_complaints,
1948 _("debug info runs off end of %s section"
1950 get_section_name (section),
1951 get_section_file_name (section));
1955 dwarf2_macro_malformed_definition_complaint (const char *arg1)
1957 complaint (&symfile_complaints,
1958 _("macro debug info contains a "
1959 "malformed macro definition:\n`%s'"),
1964 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
1966 complaint (&symfile_complaints,
1967 _("invalid attribute class or form for '%s' in '%s'"),
1971 /* Hash function for line_header_hash. */
1974 line_header_hash (const struct line_header *ofs)
1976 return ofs->offset.sect_off ^ ofs->offset_in_dwz;
1979 /* Hash function for htab_create_alloc_ex for line_header_hash. */
1982 line_header_hash_voidp (const void *item)
1984 const struct line_header *ofs = (const struct line_header *) item;
1986 return line_header_hash (ofs);
1989 /* Equality function for line_header_hash. */
1992 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
1994 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
1995 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
1997 return (ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off
1998 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2004 /* Convert VALUE between big- and little-endian. */
2006 byte_swap (offset_type value)
2010 result = (value & 0xff) << 24;
2011 result |= (value & 0xff00) << 8;
2012 result |= (value & 0xff0000) >> 8;
2013 result |= (value & 0xff000000) >> 24;
2017 #define MAYBE_SWAP(V) byte_swap (V)
2020 #define MAYBE_SWAP(V) (V)
2021 #endif /* WORDS_BIGENDIAN */
2023 /* Read the given attribute value as an address, taking the attribute's
2024 form into account. */
2027 attr_value_as_address (struct attribute *attr)
2031 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2033 /* Aside from a few clearly defined exceptions, attributes that
2034 contain an address must always be in DW_FORM_addr form.
2035 Unfortunately, some compilers happen to be violating this
2036 requirement by encoding addresses using other forms, such
2037 as DW_FORM_data4 for example. For those broken compilers,
2038 we try to do our best, without any guarantee of success,
2039 to interpret the address correctly. It would also be nice
2040 to generate a complaint, but that would require us to maintain
2041 a list of legitimate cases where a non-address form is allowed,
2042 as well as update callers to pass in at least the CU's DWARF
2043 version. This is more overhead than what we're willing to
2044 expand for a pretty rare case. */
2045 addr = DW_UNSND (attr);
2048 addr = DW_ADDR (attr);
2053 /* The suffix for an index file. */
2054 #define INDEX_SUFFIX ".gdb-index"
2056 /* Try to locate the sections we need for DWARF 2 debugging
2057 information and return true if we have enough to do something.
2058 NAMES points to the dwarf2 section names, or is NULL if the standard
2059 ELF names are used. */
2062 dwarf2_has_info (struct objfile *objfile,
2063 const struct dwarf2_debug_sections *names)
2065 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
2066 objfile_data (objfile, dwarf2_objfile_data_key));
2067 if (!dwarf2_per_objfile)
2069 /* Initialize per-objfile state. */
2070 struct dwarf2_per_objfile *data
2071 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_objfile);
2073 memset (data, 0, sizeof (*data));
2074 set_objfile_data (objfile, dwarf2_objfile_data_key, data);
2075 dwarf2_per_objfile = data;
2077 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections,
2079 dwarf2_per_objfile->objfile = objfile;
2081 return (!dwarf2_per_objfile->info.is_virtual
2082 && dwarf2_per_objfile->info.s.section != NULL
2083 && !dwarf2_per_objfile->abbrev.is_virtual
2084 && dwarf2_per_objfile->abbrev.s.section != NULL);
2087 /* Return the containing section of virtual section SECTION. */
2089 static struct dwarf2_section_info *
2090 get_containing_section (const struct dwarf2_section_info *section)
2092 gdb_assert (section->is_virtual);
2093 return section->s.containing_section;
2096 /* Return the bfd owner of SECTION. */
2099 get_section_bfd_owner (const struct dwarf2_section_info *section)
2101 if (section->is_virtual)
2103 section = get_containing_section (section);
2104 gdb_assert (!section->is_virtual);
2106 return section->s.section->owner;
2109 /* Return the bfd section of SECTION.
2110 Returns NULL if the section is not present. */
2113 get_section_bfd_section (const struct dwarf2_section_info *section)
2115 if (section->is_virtual)
2117 section = get_containing_section (section);
2118 gdb_assert (!section->is_virtual);
2120 return section->s.section;
2123 /* Return the name of SECTION. */
2126 get_section_name (const struct dwarf2_section_info *section)
2128 asection *sectp = get_section_bfd_section (section);
2130 gdb_assert (sectp != NULL);
2131 return bfd_section_name (get_section_bfd_owner (section), sectp);
2134 /* Return the name of the file SECTION is in. */
2137 get_section_file_name (const struct dwarf2_section_info *section)
2139 bfd *abfd = get_section_bfd_owner (section);
2141 return bfd_get_filename (abfd);
2144 /* Return the id of SECTION.
2145 Returns 0 if SECTION doesn't exist. */
2148 get_section_id (const struct dwarf2_section_info *section)
2150 asection *sectp = get_section_bfd_section (section);
2157 /* Return the flags of SECTION.
2158 SECTION (or containing section if this is a virtual section) must exist. */
2161 get_section_flags (const struct dwarf2_section_info *section)
2163 asection *sectp = get_section_bfd_section (section);
2165 gdb_assert (sectp != NULL);
2166 return bfd_get_section_flags (sectp->owner, sectp);
2169 /* When loading sections, we look either for uncompressed section or for
2170 compressed section names. */
2173 section_is_p (const char *section_name,
2174 const struct dwarf2_section_names *names)
2176 if (names->normal != NULL
2177 && strcmp (section_name, names->normal) == 0)
2179 if (names->compressed != NULL
2180 && strcmp (section_name, names->compressed) == 0)
2185 /* This function is mapped across the sections and remembers the
2186 offset and size of each of the debugging sections we are interested
2190 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames)
2192 const struct dwarf2_debug_sections *names;
2193 flagword aflag = bfd_get_section_flags (abfd, sectp);
2196 names = &dwarf2_elf_names;
2198 names = (const struct dwarf2_debug_sections *) vnames;
2200 if ((aflag & SEC_HAS_CONTENTS) == 0)
2203 else if (section_is_p (sectp->name, &names->info))
2205 dwarf2_per_objfile->info.s.section = sectp;
2206 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp);
2208 else if (section_is_p (sectp->name, &names->abbrev))
2210 dwarf2_per_objfile->abbrev.s.section = sectp;
2211 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp);
2213 else if (section_is_p (sectp->name, &names->line))
2215 dwarf2_per_objfile->line.s.section = sectp;
2216 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp);
2218 else if (section_is_p (sectp->name, &names->loc))
2220 dwarf2_per_objfile->loc.s.section = sectp;
2221 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp);
2223 else if (section_is_p (sectp->name, &names->macinfo))
2225 dwarf2_per_objfile->macinfo.s.section = sectp;
2226 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp);
2228 else if (section_is_p (sectp->name, &names->macro))
2230 dwarf2_per_objfile->macro.s.section = sectp;
2231 dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp);
2233 else if (section_is_p (sectp->name, &names->str))
2235 dwarf2_per_objfile->str.s.section = sectp;
2236 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp);
2238 else if (section_is_p (sectp->name, &names->addr))
2240 dwarf2_per_objfile->addr.s.section = sectp;
2241 dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp);
2243 else if (section_is_p (sectp->name, &names->frame))
2245 dwarf2_per_objfile->frame.s.section = sectp;
2246 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp);
2248 else if (section_is_p (sectp->name, &names->eh_frame))
2250 dwarf2_per_objfile->eh_frame.s.section = sectp;
2251 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp);
2253 else if (section_is_p (sectp->name, &names->ranges))
2255 dwarf2_per_objfile->ranges.s.section = sectp;
2256 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp);
2258 else if (section_is_p (sectp->name, &names->types))
2260 struct dwarf2_section_info type_section;
2262 memset (&type_section, 0, sizeof (type_section));
2263 type_section.s.section = sectp;
2264 type_section.size = bfd_get_section_size (sectp);
2266 VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types,
2269 else if (section_is_p (sectp->name, &names->gdb_index))
2271 dwarf2_per_objfile->gdb_index.s.section = sectp;
2272 dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp);
2275 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2276 && bfd_section_vma (abfd, sectp) == 0)
2277 dwarf2_per_objfile->has_section_at_zero = 1;
2280 /* A helper function that decides whether a section is empty,
2284 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2286 if (section->is_virtual)
2287 return section->size == 0;
2288 return section->s.section == NULL || section->size == 0;
2291 /* Read the contents of the section INFO.
2292 OBJFILE is the main object file, but not necessarily the file where
2293 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2295 If the section is compressed, uncompress it before returning. */
2298 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2302 gdb_byte *buf, *retbuf;
2306 info->buffer = NULL;
2309 if (dwarf2_section_empty_p (info))
2312 sectp = get_section_bfd_section (info);
2314 /* If this is a virtual section we need to read in the real one first. */
2315 if (info->is_virtual)
2317 struct dwarf2_section_info *containing_section =
2318 get_containing_section (info);
2320 gdb_assert (sectp != NULL);
2321 if ((sectp->flags & SEC_RELOC) != 0)
2323 error (_("Dwarf Error: DWP format V2 with relocations is not"
2324 " supported in section %s [in module %s]"),
2325 get_section_name (info), get_section_file_name (info));
2327 dwarf2_read_section (objfile, containing_section);
2328 /* Other code should have already caught virtual sections that don't
2330 gdb_assert (info->virtual_offset + info->size
2331 <= containing_section->size);
2332 /* If the real section is empty or there was a problem reading the
2333 section we shouldn't get here. */
2334 gdb_assert (containing_section->buffer != NULL);
2335 info->buffer = containing_section->buffer + info->virtual_offset;
2339 /* If the section has relocations, we must read it ourselves.
2340 Otherwise we attach it to the BFD. */
2341 if ((sectp->flags & SEC_RELOC) == 0)
2343 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2347 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2350 /* When debugging .o files, we may need to apply relocations; see
2351 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2352 We never compress sections in .o files, so we only need to
2353 try this when the section is not compressed. */
2354 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2357 info->buffer = retbuf;
2361 abfd = get_section_bfd_owner (info);
2362 gdb_assert (abfd != NULL);
2364 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2365 || bfd_bread (buf, info->size, abfd) != info->size)
2367 error (_("Dwarf Error: Can't read DWARF data"
2368 " in section %s [in module %s]"),
2369 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2373 /* A helper function that returns the size of a section in a safe way.
2374 If you are positive that the section has been read before using the
2375 size, then it is safe to refer to the dwarf2_section_info object's
2376 "size" field directly. In other cases, you must call this
2377 function, because for compressed sections the size field is not set
2378 correctly until the section has been read. */
2380 static bfd_size_type
2381 dwarf2_section_size (struct objfile *objfile,
2382 struct dwarf2_section_info *info)
2385 dwarf2_read_section (objfile, info);
2389 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2393 dwarf2_get_section_info (struct objfile *objfile,
2394 enum dwarf2_section_enum sect,
2395 asection **sectp, const gdb_byte **bufp,
2396 bfd_size_type *sizep)
2398 struct dwarf2_per_objfile *data
2399 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2400 dwarf2_objfile_data_key);
2401 struct dwarf2_section_info *info;
2403 /* We may see an objfile without any DWARF, in which case we just
2414 case DWARF2_DEBUG_FRAME:
2415 info = &data->frame;
2417 case DWARF2_EH_FRAME:
2418 info = &data->eh_frame;
2421 gdb_assert_not_reached ("unexpected section");
2424 dwarf2_read_section (objfile, info);
2426 *sectp = get_section_bfd_section (info);
2427 *bufp = info->buffer;
2428 *sizep = info->size;
2431 /* A helper function to find the sections for a .dwz file. */
2434 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2436 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2438 /* Note that we only support the standard ELF names, because .dwz
2439 is ELF-only (at the time of writing). */
2440 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2442 dwz_file->abbrev.s.section = sectp;
2443 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2445 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2447 dwz_file->info.s.section = sectp;
2448 dwz_file->info.size = bfd_get_section_size (sectp);
2450 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2452 dwz_file->str.s.section = sectp;
2453 dwz_file->str.size = bfd_get_section_size (sectp);
2455 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2457 dwz_file->line.s.section = sectp;
2458 dwz_file->line.size = bfd_get_section_size (sectp);
2460 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2462 dwz_file->macro.s.section = sectp;
2463 dwz_file->macro.size = bfd_get_section_size (sectp);
2465 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2467 dwz_file->gdb_index.s.section = sectp;
2468 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2472 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2473 there is no .gnu_debugaltlink section in the file. Error if there
2474 is such a section but the file cannot be found. */
2476 static struct dwz_file *
2477 dwarf2_get_dwz_file (void)
2481 struct cleanup *cleanup;
2482 const char *filename;
2483 struct dwz_file *result;
2484 bfd_size_type buildid_len_arg;
2488 if (dwarf2_per_objfile->dwz_file != NULL)
2489 return dwarf2_per_objfile->dwz_file;
2491 bfd_set_error (bfd_error_no_error);
2492 data = bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2493 &buildid_len_arg, &buildid);
2496 if (bfd_get_error () == bfd_error_no_error)
2498 error (_("could not read '.gnu_debugaltlink' section: %s"),
2499 bfd_errmsg (bfd_get_error ()));
2501 cleanup = make_cleanup (xfree, data);
2502 make_cleanup (xfree, buildid);
2504 buildid_len = (size_t) buildid_len_arg;
2506 filename = (const char *) data;
2507 if (!IS_ABSOLUTE_PATH (filename))
2509 char *abs = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2512 make_cleanup (xfree, abs);
2513 abs = ldirname (abs);
2514 make_cleanup (xfree, abs);
2516 rel = concat (abs, SLASH_STRING, filename, (char *) NULL);
2517 make_cleanup (xfree, rel);
2521 /* First try the file name given in the section. If that doesn't
2522 work, try to use the build-id instead. */
2523 dwz_bfd = gdb_bfd_open (filename, gnutarget, -1);
2524 if (dwz_bfd != NULL)
2526 if (!build_id_verify (dwz_bfd, buildid_len, buildid))
2528 gdb_bfd_unref (dwz_bfd);
2533 if (dwz_bfd == NULL)
2534 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2536 if (dwz_bfd == NULL)
2537 error (_("could not find '.gnu_debugaltlink' file for %s"),
2538 objfile_name (dwarf2_per_objfile->objfile));
2540 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2542 result->dwz_bfd = dwz_bfd;
2544 bfd_map_over_sections (dwz_bfd, locate_dwz_sections, result);
2546 do_cleanups (cleanup);
2548 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, dwz_bfd);
2549 dwarf2_per_objfile->dwz_file = result;
2553 /* DWARF quick_symbols_functions support. */
2555 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2556 unique line tables, so we maintain a separate table of all .debug_line
2557 derived entries to support the sharing.
2558 All the quick functions need is the list of file names. We discard the
2559 line_header when we're done and don't need to record it here. */
2560 struct quick_file_names
2562 /* The data used to construct the hash key. */
2563 struct stmt_list_hash hash;
2565 /* The number of entries in file_names, real_names. */
2566 unsigned int num_file_names;
2568 /* The file names from the line table, after being run through
2570 const char **file_names;
2572 /* The file names from the line table after being run through
2573 gdb_realpath. These are computed lazily. */
2574 const char **real_names;
2577 /* When using the index (and thus not using psymtabs), each CU has an
2578 object of this type. This is used to hold information needed by
2579 the various "quick" methods. */
2580 struct dwarf2_per_cu_quick_data
2582 /* The file table. This can be NULL if there was no file table
2583 or it's currently not read in.
2584 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2585 struct quick_file_names *file_names;
2587 /* The corresponding symbol table. This is NULL if symbols for this
2588 CU have not yet been read. */
2589 struct compunit_symtab *compunit_symtab;
2591 /* A temporary mark bit used when iterating over all CUs in
2592 expand_symtabs_matching. */
2593 unsigned int mark : 1;
2595 /* True if we've tried to read the file table and found there isn't one.
2596 There will be no point in trying to read it again next time. */
2597 unsigned int no_file_data : 1;
2600 /* Utility hash function for a stmt_list_hash. */
2603 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2607 if (stmt_list_hash->dwo_unit != NULL)
2608 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2609 v += stmt_list_hash->line_offset.sect_off;
2613 /* Utility equality function for a stmt_list_hash. */
2616 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2617 const struct stmt_list_hash *rhs)
2619 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2621 if (lhs->dwo_unit != NULL
2622 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2625 return lhs->line_offset.sect_off == rhs->line_offset.sect_off;
2628 /* Hash function for a quick_file_names. */
2631 hash_file_name_entry (const void *e)
2633 const struct quick_file_names *file_data
2634 = (const struct quick_file_names *) e;
2636 return hash_stmt_list_entry (&file_data->hash);
2639 /* Equality function for a quick_file_names. */
2642 eq_file_name_entry (const void *a, const void *b)
2644 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2645 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2647 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2650 /* Delete function for a quick_file_names. */
2653 delete_file_name_entry (void *e)
2655 struct quick_file_names *file_data = (struct quick_file_names *) e;
2658 for (i = 0; i < file_data->num_file_names; ++i)
2660 xfree ((void*) file_data->file_names[i]);
2661 if (file_data->real_names)
2662 xfree ((void*) file_data->real_names[i]);
2665 /* The space for the struct itself lives on objfile_obstack,
2666 so we don't free it here. */
2669 /* Create a quick_file_names hash table. */
2672 create_quick_file_names_table (unsigned int nr_initial_entries)
2674 return htab_create_alloc (nr_initial_entries,
2675 hash_file_name_entry, eq_file_name_entry,
2676 delete_file_name_entry, xcalloc, xfree);
2679 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2680 have to be created afterwards. You should call age_cached_comp_units after
2681 processing PER_CU->CU. dw2_setup must have been already called. */
2684 load_cu (struct dwarf2_per_cu_data *per_cu)
2686 if (per_cu->is_debug_types)
2687 load_full_type_unit (per_cu);
2689 load_full_comp_unit (per_cu, language_minimal);
2691 if (per_cu->cu == NULL)
2692 return; /* Dummy CU. */
2694 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2697 /* Read in the symbols for PER_CU. */
2700 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2702 struct cleanup *back_to;
2704 /* Skip type_unit_groups, reading the type units they contain
2705 is handled elsewhere. */
2706 if (IS_TYPE_UNIT_GROUP (per_cu))
2709 back_to = make_cleanup (dwarf2_release_queue, NULL);
2711 if (dwarf2_per_objfile->using_index
2712 ? per_cu->v.quick->compunit_symtab == NULL
2713 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2715 queue_comp_unit (per_cu, language_minimal);
2718 /* If we just loaded a CU from a DWO, and we're working with an index
2719 that may badly handle TUs, load all the TUs in that DWO as well.
2720 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2721 if (!per_cu->is_debug_types
2722 && per_cu->cu != NULL
2723 && per_cu->cu->dwo_unit != NULL
2724 && dwarf2_per_objfile->index_table != NULL
2725 && dwarf2_per_objfile->index_table->version <= 7
2726 /* DWP files aren't supported yet. */
2727 && get_dwp_file () == NULL)
2728 queue_and_load_all_dwo_tus (per_cu);
2733 /* Age the cache, releasing compilation units that have not
2734 been used recently. */
2735 age_cached_comp_units ();
2737 do_cleanups (back_to);
2740 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2741 the objfile from which this CU came. Returns the resulting symbol
2744 static struct compunit_symtab *
2745 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2747 gdb_assert (dwarf2_per_objfile->using_index);
2748 if (!per_cu->v.quick->compunit_symtab)
2750 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2751 increment_reading_symtab ();
2752 dw2_do_instantiate_symtab (per_cu);
2753 process_cu_includes ();
2754 do_cleanups (back_to);
2757 return per_cu->v.quick->compunit_symtab;
2760 /* Return the CU/TU given its index.
2762 This is intended for loops like:
2764 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2765 + dwarf2_per_objfile->n_type_units); ++i)
2767 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
2773 static struct dwarf2_per_cu_data *
2774 dw2_get_cutu (int index)
2776 if (index >= dwarf2_per_objfile->n_comp_units)
2778 index -= dwarf2_per_objfile->n_comp_units;
2779 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2780 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2783 return dwarf2_per_objfile->all_comp_units[index];
2786 /* Return the CU given its index.
2787 This differs from dw2_get_cutu in that it's for when you know INDEX
2790 static struct dwarf2_per_cu_data *
2791 dw2_get_cu (int index)
2793 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
2795 return dwarf2_per_objfile->all_comp_units[index];
2798 /* A helper for create_cus_from_index that handles a given list of
2802 create_cus_from_index_list (struct objfile *objfile,
2803 const gdb_byte *cu_list, offset_type n_elements,
2804 struct dwarf2_section_info *section,
2810 for (i = 0; i < n_elements; i += 2)
2812 struct dwarf2_per_cu_data *the_cu;
2813 ULONGEST offset, length;
2815 gdb_static_assert (sizeof (ULONGEST) >= 8);
2816 offset = extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2817 length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2820 the_cu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2821 struct dwarf2_per_cu_data);
2822 the_cu->offset.sect_off = offset;
2823 the_cu->length = length;
2824 the_cu->objfile = objfile;
2825 the_cu->section = section;
2826 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2827 struct dwarf2_per_cu_quick_data);
2828 the_cu->is_dwz = is_dwz;
2829 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
2833 /* Read the CU list from the mapped index, and use it to create all
2834 the CU objects for this objfile. */
2837 create_cus_from_index (struct objfile *objfile,
2838 const gdb_byte *cu_list, offset_type cu_list_elements,
2839 const gdb_byte *dwz_list, offset_type dwz_elements)
2841 struct dwz_file *dwz;
2843 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
2844 dwarf2_per_objfile->all_comp_units =
2845 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
2846 dwarf2_per_objfile->n_comp_units);
2848 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
2849 &dwarf2_per_objfile->info, 0, 0);
2851 if (dwz_elements == 0)
2854 dwz = dwarf2_get_dwz_file ();
2855 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
2856 cu_list_elements / 2);
2859 /* Create the signatured type hash table from the index. */
2862 create_signatured_type_table_from_index (struct objfile *objfile,
2863 struct dwarf2_section_info *section,
2864 const gdb_byte *bytes,
2865 offset_type elements)
2868 htab_t sig_types_hash;
2870 dwarf2_per_objfile->n_type_units
2871 = dwarf2_per_objfile->n_allocated_type_units
2873 dwarf2_per_objfile->all_type_units =
2874 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
2876 sig_types_hash = allocate_signatured_type_table (objfile);
2878 for (i = 0; i < elements; i += 3)
2880 struct signatured_type *sig_type;
2881 ULONGEST offset, type_offset_in_tu, signature;
2884 gdb_static_assert (sizeof (ULONGEST) >= 8);
2885 offset = extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
2886 type_offset_in_tu = extract_unsigned_integer (bytes + 8, 8,
2888 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
2891 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2892 struct signatured_type);
2893 sig_type->signature = signature;
2894 sig_type->type_offset_in_tu.cu_off = type_offset_in_tu;
2895 sig_type->per_cu.is_debug_types = 1;
2896 sig_type->per_cu.section = section;
2897 sig_type->per_cu.offset.sect_off = offset;
2898 sig_type->per_cu.objfile = objfile;
2899 sig_type->per_cu.v.quick
2900 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2901 struct dwarf2_per_cu_quick_data);
2903 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
2906 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
2909 dwarf2_per_objfile->signatured_types = sig_types_hash;
2912 /* Read the address map data from the mapped index, and use it to
2913 populate the objfile's psymtabs_addrmap. */
2916 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
2918 struct gdbarch *gdbarch = get_objfile_arch (objfile);
2919 const gdb_byte *iter, *end;
2920 struct obstack temp_obstack;
2921 struct addrmap *mutable_map;
2922 struct cleanup *cleanup;
2925 obstack_init (&temp_obstack);
2926 cleanup = make_cleanup_obstack_free (&temp_obstack);
2927 mutable_map = addrmap_create_mutable (&temp_obstack);
2929 iter = index->address_table;
2930 end = iter + index->address_table_size;
2932 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
2936 ULONGEST hi, lo, cu_index;
2937 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2939 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2941 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
2946 complaint (&symfile_complaints,
2947 _(".gdb_index address table has invalid range (%s - %s)"),
2948 hex_string (lo), hex_string (hi));
2952 if (cu_index >= dwarf2_per_objfile->n_comp_units)
2954 complaint (&symfile_complaints,
2955 _(".gdb_index address table has invalid CU number %u"),
2956 (unsigned) cu_index);
2960 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
2961 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
2962 addrmap_set_empty (mutable_map, lo, hi - 1, dw2_get_cutu (cu_index));
2965 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
2966 &objfile->objfile_obstack);
2967 do_cleanups (cleanup);
2970 /* The hash function for strings in the mapped index. This is the same as
2971 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
2972 implementation. This is necessary because the hash function is tied to the
2973 format of the mapped index file. The hash values do not have to match with
2976 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
2979 mapped_index_string_hash (int index_version, const void *p)
2981 const unsigned char *str = (const unsigned char *) p;
2985 while ((c = *str++) != 0)
2987 if (index_version >= 5)
2989 r = r * 67 + c - 113;
2995 /* Find a slot in the mapped index INDEX for the object named NAME.
2996 If NAME is found, set *VEC_OUT to point to the CU vector in the
2997 constant pool and return 1. If NAME cannot be found, return 0. */
3000 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3001 offset_type **vec_out)
3003 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
3005 offset_type slot, step;
3006 int (*cmp) (const char *, const char *);
3008 if (current_language->la_language == language_cplus
3009 || current_language->la_language == language_fortran
3010 || current_language->la_language == language_d)
3012 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3015 if (strchr (name, '(') != NULL)
3017 char *without_params = cp_remove_params (name);
3019 if (without_params != NULL)
3021 make_cleanup (xfree, without_params);
3022 name = without_params;
3027 /* Index version 4 did not support case insensitive searches. But the
3028 indices for case insensitive languages are built in lowercase, therefore
3029 simulate our NAME being searched is also lowercased. */
3030 hash = mapped_index_string_hash ((index->version == 4
3031 && case_sensitivity == case_sensitive_off
3032 ? 5 : index->version),
3035 slot = hash & (index->symbol_table_slots - 1);
3036 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
3037 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3041 /* Convert a slot number to an offset into the table. */
3042 offset_type i = 2 * slot;
3044 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
3046 do_cleanups (back_to);
3050 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
3051 if (!cmp (name, str))
3053 *vec_out = (offset_type *) (index->constant_pool
3054 + MAYBE_SWAP (index->symbol_table[i + 1]));
3055 do_cleanups (back_to);
3059 slot = (slot + step) & (index->symbol_table_slots - 1);
3063 /* A helper function that reads the .gdb_index from SECTION and fills
3064 in MAP. FILENAME is the name of the file containing the section;
3065 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3066 ok to use deprecated sections.
3068 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3069 out parameters that are filled in with information about the CU and
3070 TU lists in the section.
3072 Returns 1 if all went well, 0 otherwise. */
3075 read_index_from_section (struct objfile *objfile,
3076 const char *filename,
3078 struct dwarf2_section_info *section,
3079 struct mapped_index *map,
3080 const gdb_byte **cu_list,
3081 offset_type *cu_list_elements,
3082 const gdb_byte **types_list,
3083 offset_type *types_list_elements)
3085 const gdb_byte *addr;
3086 offset_type version;
3087 offset_type *metadata;
3090 if (dwarf2_section_empty_p (section))
3093 /* Older elfutils strip versions could keep the section in the main
3094 executable while splitting it for the separate debug info file. */
3095 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3098 dwarf2_read_section (objfile, section);
3100 addr = section->buffer;
3101 /* Version check. */
3102 version = MAYBE_SWAP (*(offset_type *) addr);
3103 /* Versions earlier than 3 emitted every copy of a psymbol. This
3104 causes the index to behave very poorly for certain requests. Version 3
3105 contained incomplete addrmap. So, it seems better to just ignore such
3109 static int warning_printed = 0;
3110 if (!warning_printed)
3112 warning (_("Skipping obsolete .gdb_index section in %s."),
3114 warning_printed = 1;
3118 /* Index version 4 uses a different hash function than index version
3121 Versions earlier than 6 did not emit psymbols for inlined
3122 functions. Using these files will cause GDB not to be able to
3123 set breakpoints on inlined functions by name, so we ignore these
3124 indices unless the user has done
3125 "set use-deprecated-index-sections on". */
3126 if (version < 6 && !deprecated_ok)
3128 static int warning_printed = 0;
3129 if (!warning_printed)
3132 Skipping deprecated .gdb_index section in %s.\n\
3133 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3134 to use the section anyway."),
3136 warning_printed = 1;
3140 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3141 of the TU (for symbols coming from TUs),
3142 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3143 Plus gold-generated indices can have duplicate entries for global symbols,
3144 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3145 These are just performance bugs, and we can't distinguish gdb-generated
3146 indices from gold-generated ones, so issue no warning here. */
3148 /* Indexes with higher version than the one supported by GDB may be no
3149 longer backward compatible. */
3153 map->version = version;
3154 map->total_size = section->size;
3156 metadata = (offset_type *) (addr + sizeof (offset_type));
3159 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3160 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3164 *types_list = addr + MAYBE_SWAP (metadata[i]);
3165 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3166 - MAYBE_SWAP (metadata[i]))
3170 map->address_table = addr + MAYBE_SWAP (metadata[i]);
3171 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
3172 - MAYBE_SWAP (metadata[i]));
3175 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
3176 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
3177 - MAYBE_SWAP (metadata[i]))
3178 / (2 * sizeof (offset_type)));
3181 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3187 /* Read the index file. If everything went ok, initialize the "quick"
3188 elements of all the CUs and return 1. Otherwise, return 0. */
3191 dwarf2_read_index (struct objfile *objfile)
3193 struct mapped_index local_map, *map;
3194 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3195 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3196 struct dwz_file *dwz;
3198 if (!read_index_from_section (objfile, objfile_name (objfile),
3199 use_deprecated_index_sections,
3200 &dwarf2_per_objfile->gdb_index, &local_map,
3201 &cu_list, &cu_list_elements,
3202 &types_list, &types_list_elements))
3205 /* Don't use the index if it's empty. */
3206 if (local_map.symbol_table_slots == 0)
3209 /* If there is a .dwz file, read it so we can get its CU list as
3211 dwz = dwarf2_get_dwz_file ();
3214 struct mapped_index dwz_map;
3215 const gdb_byte *dwz_types_ignore;
3216 offset_type dwz_types_elements_ignore;
3218 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3220 &dwz->gdb_index, &dwz_map,
3221 &dwz_list, &dwz_list_elements,
3223 &dwz_types_elements_ignore))
3225 warning (_("could not read '.gdb_index' section from %s; skipping"),
3226 bfd_get_filename (dwz->dwz_bfd));
3231 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3234 if (types_list_elements)
3236 struct dwarf2_section_info *section;
3238 /* We can only handle a single .debug_types when we have an
3240 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3243 section = VEC_index (dwarf2_section_info_def,
3244 dwarf2_per_objfile->types, 0);
3246 create_signatured_type_table_from_index (objfile, section, types_list,
3247 types_list_elements);
3250 create_addrmap_from_index (objfile, &local_map);
3252 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
3255 dwarf2_per_objfile->index_table = map;
3256 dwarf2_per_objfile->using_index = 1;
3257 dwarf2_per_objfile->quick_file_names_table =
3258 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3263 /* A helper for the "quick" functions which sets the global
3264 dwarf2_per_objfile according to OBJFILE. */
3267 dw2_setup (struct objfile *objfile)
3269 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
3270 objfile_data (objfile, dwarf2_objfile_data_key));
3271 gdb_assert (dwarf2_per_objfile);
3274 /* die_reader_func for dw2_get_file_names. */
3277 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3278 const gdb_byte *info_ptr,
3279 struct die_info *comp_unit_die,
3283 struct dwarf2_cu *cu = reader->cu;
3284 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3285 struct objfile *objfile = dwarf2_per_objfile->objfile;
3286 struct dwarf2_per_cu_data *lh_cu;
3287 struct line_header *lh;
3288 struct attribute *attr;
3290 const char *name, *comp_dir;
3292 struct quick_file_names *qfn;
3293 unsigned int line_offset;
3295 gdb_assert (! this_cu->is_debug_types);
3297 /* Our callers never want to match partial units -- instead they
3298 will match the enclosing full CU. */
3299 if (comp_unit_die->tag == DW_TAG_partial_unit)
3301 this_cu->v.quick->no_file_data = 1;
3310 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3313 struct quick_file_names find_entry;
3315 line_offset = DW_UNSND (attr);
3317 /* We may have already read in this line header (TU line header sharing).
3318 If we have we're done. */
3319 find_entry.hash.dwo_unit = cu->dwo_unit;
3320 find_entry.hash.line_offset.sect_off = line_offset;
3321 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3322 &find_entry, INSERT);
3325 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3329 lh = dwarf_decode_line_header (line_offset, cu);
3333 lh_cu->v.quick->no_file_data = 1;
3337 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3338 qfn->hash.dwo_unit = cu->dwo_unit;
3339 qfn->hash.line_offset.sect_off = line_offset;
3340 gdb_assert (slot != NULL);
3343 find_file_and_directory (comp_unit_die, cu, &name, &comp_dir);
3345 qfn->num_file_names = lh->num_file_names;
3347 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->num_file_names);
3348 for (i = 0; i < lh->num_file_names; ++i)
3349 qfn->file_names[i] = file_full_name (i + 1, lh, comp_dir);
3350 qfn->real_names = NULL;
3352 free_line_header (lh);
3354 lh_cu->v.quick->file_names = qfn;
3357 /* A helper for the "quick" functions which attempts to read the line
3358 table for THIS_CU. */
3360 static struct quick_file_names *
3361 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3363 /* This should never be called for TUs. */
3364 gdb_assert (! this_cu->is_debug_types);
3365 /* Nor type unit groups. */
3366 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3368 if (this_cu->v.quick->file_names != NULL)
3369 return this_cu->v.quick->file_names;
3370 /* If we know there is no line data, no point in looking again. */
3371 if (this_cu->v.quick->no_file_data)
3374 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3376 if (this_cu->v.quick->no_file_data)
3378 return this_cu->v.quick->file_names;
3381 /* A helper for the "quick" functions which computes and caches the
3382 real path for a given file name from the line table. */
3385 dw2_get_real_path (struct objfile *objfile,
3386 struct quick_file_names *qfn, int index)
3388 if (qfn->real_names == NULL)
3389 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3390 qfn->num_file_names, const char *);
3392 if (qfn->real_names[index] == NULL)
3393 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]);
3395 return qfn->real_names[index];
3398 static struct symtab *
3399 dw2_find_last_source_symtab (struct objfile *objfile)
3401 struct compunit_symtab *cust;
3404 dw2_setup (objfile);
3405 index = dwarf2_per_objfile->n_comp_units - 1;
3406 cust = dw2_instantiate_symtab (dw2_get_cutu (index));
3409 return compunit_primary_filetab (cust);
3412 /* Traversal function for dw2_forget_cached_source_info. */
3415 dw2_free_cached_file_names (void **slot, void *info)
3417 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3419 if (file_data->real_names)
3423 for (i = 0; i < file_data->num_file_names; ++i)
3425 xfree ((void*) file_data->real_names[i]);
3426 file_data->real_names[i] = NULL;
3434 dw2_forget_cached_source_info (struct objfile *objfile)
3436 dw2_setup (objfile);
3438 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3439 dw2_free_cached_file_names, NULL);
3442 /* Helper function for dw2_map_symtabs_matching_filename that expands
3443 the symtabs and calls the iterator. */
3446 dw2_map_expand_apply (struct objfile *objfile,
3447 struct dwarf2_per_cu_data *per_cu,
3448 const char *name, const char *real_path,
3449 int (*callback) (struct symtab *, void *),
3452 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3454 /* Don't visit already-expanded CUs. */
3455 if (per_cu->v.quick->compunit_symtab)
3458 /* This may expand more than one symtab, and we want to iterate over
3460 dw2_instantiate_symtab (per_cu);
3462 return iterate_over_some_symtabs (name, real_path, callback, data,
3463 objfile->compunit_symtabs, last_made);
3466 /* Implementation of the map_symtabs_matching_filename method. */
3469 dw2_map_symtabs_matching_filename (struct objfile *objfile, const char *name,
3470 const char *real_path,
3471 int (*callback) (struct symtab *, void *),
3475 const char *name_basename = lbasename (name);
3477 dw2_setup (objfile);
3479 /* The rule is CUs specify all the files, including those used by
3480 any TU, so there's no need to scan TUs here. */
3482 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3485 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3486 struct quick_file_names *file_data;
3488 /* We only need to look at symtabs not already expanded. */
3489 if (per_cu->v.quick->compunit_symtab)
3492 file_data = dw2_get_file_names (per_cu);
3493 if (file_data == NULL)
3496 for (j = 0; j < file_data->num_file_names; ++j)
3498 const char *this_name = file_data->file_names[j];
3499 const char *this_real_name;
3501 if (compare_filenames_for_search (this_name, name))
3503 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3509 /* Before we invoke realpath, which can get expensive when many
3510 files are involved, do a quick comparison of the basenames. */
3511 if (! basenames_may_differ
3512 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3515 this_real_name = dw2_get_real_path (objfile, file_data, j);
3516 if (compare_filenames_for_search (this_real_name, name))
3518 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3524 if (real_path != NULL)
3526 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3527 gdb_assert (IS_ABSOLUTE_PATH (name));
3528 if (this_real_name != NULL
3529 && FILENAME_CMP (real_path, this_real_name) == 0)
3531 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3543 /* Struct used to manage iterating over all CUs looking for a symbol. */
3545 struct dw2_symtab_iterator
3547 /* The internalized form of .gdb_index. */
3548 struct mapped_index *index;
3549 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3550 int want_specific_block;
3551 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3552 Unused if !WANT_SPECIFIC_BLOCK. */
3554 /* The kind of symbol we're looking for. */
3556 /* The list of CUs from the index entry of the symbol,
3557 or NULL if not found. */
3559 /* The next element in VEC to look at. */
3561 /* The number of elements in VEC, or zero if there is no match. */
3563 /* Have we seen a global version of the symbol?
3564 If so we can ignore all further global instances.
3565 This is to work around gold/15646, inefficient gold-generated
3570 /* Initialize the index symtab iterator ITER.
3571 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3572 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3575 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3576 struct mapped_index *index,
3577 int want_specific_block,
3582 iter->index = index;
3583 iter->want_specific_block = want_specific_block;
3584 iter->block_index = block_index;
3585 iter->domain = domain;
3587 iter->global_seen = 0;
3589 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3590 iter->length = MAYBE_SWAP (*iter->vec);
3598 /* Return the next matching CU or NULL if there are no more. */
3600 static struct dwarf2_per_cu_data *
3601 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3603 for ( ; iter->next < iter->length; ++iter->next)
3605 offset_type cu_index_and_attrs =
3606 MAYBE_SWAP (iter->vec[iter->next + 1]);
3607 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3608 struct dwarf2_per_cu_data *per_cu;
3609 int want_static = iter->block_index != GLOBAL_BLOCK;
3610 /* This value is only valid for index versions >= 7. */
3611 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3612 gdb_index_symbol_kind symbol_kind =
3613 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3614 /* Only check the symbol attributes if they're present.
3615 Indices prior to version 7 don't record them,
3616 and indices >= 7 may elide them for certain symbols
3617 (gold does this). */
3619 (iter->index->version >= 7
3620 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3622 /* Don't crash on bad data. */
3623 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3624 + dwarf2_per_objfile->n_type_units))
3626 complaint (&symfile_complaints,
3627 _(".gdb_index entry has bad CU index"
3629 objfile_name (dwarf2_per_objfile->objfile));
3633 per_cu = dw2_get_cutu (cu_index);
3635 /* Skip if already read in. */
3636 if (per_cu->v.quick->compunit_symtab)
3639 /* Check static vs global. */
3642 if (iter->want_specific_block
3643 && want_static != is_static)
3645 /* Work around gold/15646. */
3646 if (!is_static && iter->global_seen)
3649 iter->global_seen = 1;
3652 /* Only check the symbol's kind if it has one. */
3655 switch (iter->domain)
3658 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3659 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3660 /* Some types are also in VAR_DOMAIN. */
3661 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3665 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3669 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3684 static struct compunit_symtab *
3685 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3686 const char *name, domain_enum domain)
3688 struct compunit_symtab *stab_best = NULL;
3689 struct mapped_index *index;
3691 dw2_setup (objfile);
3693 index = dwarf2_per_objfile->index_table;
3695 /* index is NULL if OBJF_READNOW. */
3698 struct dw2_symtab_iterator iter;
3699 struct dwarf2_per_cu_data *per_cu;
3701 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3703 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3705 struct symbol *sym, *with_opaque = NULL;
3706 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
3707 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
3708 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3710 sym = block_find_symbol (block, name, domain,
3711 block_find_non_opaque_type_preferred,
3714 /* Some caution must be observed with overloaded functions
3715 and methods, since the index will not contain any overload
3716 information (but NAME might contain it). */
3719 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
3721 if (with_opaque != NULL
3722 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
3725 /* Keep looking through other CUs. */
3733 dw2_print_stats (struct objfile *objfile)
3735 int i, total, count;
3737 dw2_setup (objfile);
3738 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3740 for (i = 0; i < total; ++i)
3742 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3744 if (!per_cu->v.quick->compunit_symtab)
3747 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3748 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3751 /* This dumps minimal information about the index.
3752 It is called via "mt print objfiles".
3753 One use is to verify .gdb_index has been loaded by the
3754 gdb.dwarf2/gdb-index.exp testcase. */
3757 dw2_dump (struct objfile *objfile)
3759 dw2_setup (objfile);
3760 gdb_assert (dwarf2_per_objfile->using_index);
3761 printf_filtered (".gdb_index:");
3762 if (dwarf2_per_objfile->index_table != NULL)
3764 printf_filtered (" version %d\n",
3765 dwarf2_per_objfile->index_table->version);
3768 printf_filtered (" faked for \"readnow\"\n");
3769 printf_filtered ("\n");
3773 dw2_relocate (struct objfile *objfile,
3774 const struct section_offsets *new_offsets,
3775 const struct section_offsets *delta)
3777 /* There's nothing to relocate here. */
3781 dw2_expand_symtabs_for_function (struct objfile *objfile,
3782 const char *func_name)
3784 struct mapped_index *index;
3786 dw2_setup (objfile);
3788 index = dwarf2_per_objfile->index_table;
3790 /* index is NULL if OBJF_READNOW. */
3793 struct dw2_symtab_iterator iter;
3794 struct dwarf2_per_cu_data *per_cu;
3796 /* Note: It doesn't matter what we pass for block_index here. */
3797 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3800 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3801 dw2_instantiate_symtab (per_cu);
3806 dw2_expand_all_symtabs (struct objfile *objfile)
3810 dw2_setup (objfile);
3812 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3813 + dwarf2_per_objfile->n_type_units); ++i)
3815 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3817 dw2_instantiate_symtab (per_cu);
3822 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
3823 const char *fullname)
3827 dw2_setup (objfile);
3829 /* We don't need to consider type units here.
3830 This is only called for examining code, e.g. expand_line_sal.
3831 There can be an order of magnitude (or more) more type units
3832 than comp units, and we avoid them if we can. */
3834 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3837 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3838 struct quick_file_names *file_data;
3840 /* We only need to look at symtabs not already expanded. */
3841 if (per_cu->v.quick->compunit_symtab)
3844 file_data = dw2_get_file_names (per_cu);
3845 if (file_data == NULL)
3848 for (j = 0; j < file_data->num_file_names; ++j)
3850 const char *this_fullname = file_data->file_names[j];
3852 if (filename_cmp (this_fullname, fullname) == 0)
3854 dw2_instantiate_symtab (per_cu);
3862 dw2_map_matching_symbols (struct objfile *objfile,
3863 const char * name, domain_enum domain,
3865 int (*callback) (struct block *,
3866 struct symbol *, void *),
3867 void *data, symbol_compare_ftype *match,
3868 symbol_compare_ftype *ordered_compare)
3870 /* Currently unimplemented; used for Ada. The function can be called if the
3871 current language is Ada for a non-Ada objfile using GNU index. As Ada
3872 does not look for non-Ada symbols this function should just return. */
3876 dw2_expand_symtabs_matching
3877 (struct objfile *objfile,
3878 expand_symtabs_file_matcher_ftype *file_matcher,
3879 expand_symtabs_symbol_matcher_ftype *symbol_matcher,
3880 expand_symtabs_exp_notify_ftype *expansion_notify,
3881 enum search_domain kind,
3886 struct mapped_index *index;
3888 dw2_setup (objfile);
3890 /* index_table is NULL if OBJF_READNOW. */
3891 if (!dwarf2_per_objfile->index_table)
3893 index = dwarf2_per_objfile->index_table;
3895 if (file_matcher != NULL)
3897 struct cleanup *cleanup;
3898 htab_t visited_found, visited_not_found;
3900 visited_found = htab_create_alloc (10,
3901 htab_hash_pointer, htab_eq_pointer,
3902 NULL, xcalloc, xfree);
3903 cleanup = make_cleanup_htab_delete (visited_found);
3904 visited_not_found = htab_create_alloc (10,
3905 htab_hash_pointer, htab_eq_pointer,
3906 NULL, xcalloc, xfree);
3907 make_cleanup_htab_delete (visited_not_found);
3909 /* The rule is CUs specify all the files, including those used by
3910 any TU, so there's no need to scan TUs here. */
3912 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3915 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3916 struct quick_file_names *file_data;
3921 per_cu->v.quick->mark = 0;
3923 /* We only need to look at symtabs not already expanded. */
3924 if (per_cu->v.quick->compunit_symtab)
3927 file_data = dw2_get_file_names (per_cu);
3928 if (file_data == NULL)
3931 if (htab_find (visited_not_found, file_data) != NULL)
3933 else if (htab_find (visited_found, file_data) != NULL)
3935 per_cu->v.quick->mark = 1;
3939 for (j = 0; j < file_data->num_file_names; ++j)
3941 const char *this_real_name;
3943 if (file_matcher (file_data->file_names[j], data, 0))
3945 per_cu->v.quick->mark = 1;
3949 /* Before we invoke realpath, which can get expensive when many
3950 files are involved, do a quick comparison of the basenames. */
3951 if (!basenames_may_differ
3952 && !file_matcher (lbasename (file_data->file_names[j]),
3956 this_real_name = dw2_get_real_path (objfile, file_data, j);
3957 if (file_matcher (this_real_name, data, 0))
3959 per_cu->v.quick->mark = 1;
3964 slot = htab_find_slot (per_cu->v.quick->mark
3966 : visited_not_found,
3971 do_cleanups (cleanup);
3974 for (iter = 0; iter < index->symbol_table_slots; ++iter)
3976 offset_type idx = 2 * iter;
3978 offset_type *vec, vec_len, vec_idx;
3979 int global_seen = 0;
3983 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
3986 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
3988 if (! (*symbol_matcher) (name, data))
3991 /* The name was matched, now expand corresponding CUs that were
3993 vec = (offset_type *) (index->constant_pool
3994 + MAYBE_SWAP (index->symbol_table[idx + 1]));
3995 vec_len = MAYBE_SWAP (vec[0]);
3996 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
3998 struct dwarf2_per_cu_data *per_cu;
3999 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
4000 /* This value is only valid for index versions >= 7. */
4001 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
4002 gdb_index_symbol_kind symbol_kind =
4003 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
4004 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
4005 /* Only check the symbol attributes if they're present.
4006 Indices prior to version 7 don't record them,
4007 and indices >= 7 may elide them for certain symbols
4008 (gold does this). */
4010 (index->version >= 7
4011 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4013 /* Work around gold/15646. */
4016 if (!is_static && global_seen)
4022 /* Only check the symbol's kind if it has one. */
4027 case VARIABLES_DOMAIN:
4028 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
4031 case FUNCTIONS_DOMAIN:
4032 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
4036 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4044 /* Don't crash on bad data. */
4045 if (cu_index >= (dwarf2_per_objfile->n_comp_units
4046 + dwarf2_per_objfile->n_type_units))
4048 complaint (&symfile_complaints,
4049 _(".gdb_index entry has bad CU index"
4050 " [in module %s]"), objfile_name (objfile));
4054 per_cu = dw2_get_cutu (cu_index);
4055 if (file_matcher == NULL || per_cu->v.quick->mark)
4057 int symtab_was_null =
4058 (per_cu->v.quick->compunit_symtab == NULL);
4060 dw2_instantiate_symtab (per_cu);
4062 if (expansion_notify != NULL
4064 && per_cu->v.quick->compunit_symtab != NULL)
4066 expansion_notify (per_cu->v.quick->compunit_symtab,
4074 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
4077 static struct compunit_symtab *
4078 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
4083 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
4084 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
4087 if (cust->includes == NULL)
4090 for (i = 0; cust->includes[i]; ++i)
4092 struct compunit_symtab *s = cust->includes[i];
4094 s = recursively_find_pc_sect_compunit_symtab (s, pc);
4102 static struct compunit_symtab *
4103 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
4104 struct bound_minimal_symbol msymbol,
4106 struct obj_section *section,
4109 struct dwarf2_per_cu_data *data;
4110 struct compunit_symtab *result;
4112 dw2_setup (objfile);
4114 if (!objfile->psymtabs_addrmap)
4117 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
4122 if (warn_if_readin && data->v.quick->compunit_symtab)
4123 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
4124 paddress (get_objfile_arch (objfile), pc));
4127 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
4129 gdb_assert (result != NULL);
4134 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
4135 void *data, int need_fullname)
4138 struct cleanup *cleanup;
4139 htab_t visited = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
4140 NULL, xcalloc, xfree);
4142 cleanup = make_cleanup_htab_delete (visited);
4143 dw2_setup (objfile);
4145 /* The rule is CUs specify all the files, including those used by
4146 any TU, so there's no need to scan TUs here.
4147 We can ignore file names coming from already-expanded CUs. */
4149 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4151 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4153 if (per_cu->v.quick->compunit_symtab)
4155 void **slot = htab_find_slot (visited, per_cu->v.quick->file_names,
4158 *slot = per_cu->v.quick->file_names;
4162 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4165 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4166 struct quick_file_names *file_data;
4169 /* We only need to look at symtabs not already expanded. */
4170 if (per_cu->v.quick->compunit_symtab)
4173 file_data = dw2_get_file_names (per_cu);
4174 if (file_data == NULL)
4177 slot = htab_find_slot (visited, file_data, INSERT);
4180 /* Already visited. */
4185 for (j = 0; j < file_data->num_file_names; ++j)
4187 const char *this_real_name;
4190 this_real_name = dw2_get_real_path (objfile, file_data, j);
4192 this_real_name = NULL;
4193 (*fun) (file_data->file_names[j], this_real_name, data);
4197 do_cleanups (cleanup);
4201 dw2_has_symbols (struct objfile *objfile)
4206 const struct quick_symbol_functions dwarf2_gdb_index_functions =
4209 dw2_find_last_source_symtab,
4210 dw2_forget_cached_source_info,
4211 dw2_map_symtabs_matching_filename,
4216 dw2_expand_symtabs_for_function,
4217 dw2_expand_all_symtabs,
4218 dw2_expand_symtabs_with_fullname,
4219 dw2_map_matching_symbols,
4220 dw2_expand_symtabs_matching,
4221 dw2_find_pc_sect_compunit_symtab,
4222 dw2_map_symbol_filenames
4225 /* Initialize for reading DWARF for this objfile. Return 0 if this
4226 file will use psymtabs, or 1 if using the GNU index. */
4229 dwarf2_initialize_objfile (struct objfile *objfile)
4231 /* If we're about to read full symbols, don't bother with the
4232 indices. In this case we also don't care if some other debug
4233 format is making psymtabs, because they are all about to be
4235 if ((objfile->flags & OBJF_READNOW))
4239 dwarf2_per_objfile->using_index = 1;
4240 create_all_comp_units (objfile);
4241 create_all_type_units (objfile);
4242 dwarf2_per_objfile->quick_file_names_table =
4243 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
4245 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4246 + dwarf2_per_objfile->n_type_units); ++i)
4248 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4250 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4251 struct dwarf2_per_cu_quick_data);
4254 /* Return 1 so that gdb sees the "quick" functions. However,
4255 these functions will be no-ops because we will have expanded
4260 if (dwarf2_read_index (objfile))
4268 /* Build a partial symbol table. */
4271 dwarf2_build_psymtabs (struct objfile *objfile)
4274 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
4276 init_psymbol_list (objfile, 1024);
4281 /* This isn't really ideal: all the data we allocate on the
4282 objfile's obstack is still uselessly kept around. However,
4283 freeing it seems unsafe. */
4284 struct cleanup *cleanups = make_cleanup_discard_psymtabs (objfile);
4286 dwarf2_build_psymtabs_hard (objfile);
4287 discard_cleanups (cleanups);
4289 CATCH (except, RETURN_MASK_ERROR)
4291 exception_print (gdb_stderr, except);
4296 /* Return the total length of the CU described by HEADER. */
4299 get_cu_length (const struct comp_unit_head *header)
4301 return header->initial_length_size + header->length;
4304 /* Return TRUE if OFFSET is within CU_HEADER. */
4307 offset_in_cu_p (const struct comp_unit_head *cu_header, sect_offset offset)
4309 sect_offset bottom = { cu_header->offset.sect_off };
4310 sect_offset top = { cu_header->offset.sect_off + get_cu_length (cu_header) };
4312 return (offset.sect_off >= bottom.sect_off && offset.sect_off < top.sect_off);
4315 /* Find the base address of the compilation unit for range lists and
4316 location lists. It will normally be specified by DW_AT_low_pc.
4317 In DWARF-3 draft 4, the base address could be overridden by
4318 DW_AT_entry_pc. It's been removed, but GCC still uses this for
4319 compilation units with discontinuous ranges. */
4322 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
4324 struct attribute *attr;
4327 cu->base_address = 0;
4329 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
4332 cu->base_address = attr_value_as_address (attr);
4337 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
4340 cu->base_address = attr_value_as_address (attr);
4346 /* Read in the comp unit header information from the debug_info at info_ptr.
4347 NOTE: This leaves members offset, first_die_offset to be filled in
4350 static const gdb_byte *
4351 read_comp_unit_head (struct comp_unit_head *cu_header,
4352 const gdb_byte *info_ptr, bfd *abfd)
4355 unsigned int bytes_read;
4357 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
4358 cu_header->initial_length_size = bytes_read;
4359 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
4360 info_ptr += bytes_read;
4361 cu_header->version = read_2_bytes (abfd, info_ptr);
4363 cu_header->abbrev_offset.sect_off = read_offset (abfd, info_ptr, cu_header,
4365 info_ptr += bytes_read;
4366 cu_header->addr_size = read_1_byte (abfd, info_ptr);
4368 signed_addr = bfd_get_sign_extend_vma (abfd);
4369 if (signed_addr < 0)
4370 internal_error (__FILE__, __LINE__,
4371 _("read_comp_unit_head: dwarf from non elf file"));
4372 cu_header->signed_addr_p = signed_addr;
4377 /* Helper function that returns the proper abbrev section for
4380 static struct dwarf2_section_info *
4381 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
4383 struct dwarf2_section_info *abbrev;
4385 if (this_cu->is_dwz)
4386 abbrev = &dwarf2_get_dwz_file ()->abbrev;
4388 abbrev = &dwarf2_per_objfile->abbrev;
4393 /* Subroutine of read_and_check_comp_unit_head and
4394 read_and_check_type_unit_head to simplify them.
4395 Perform various error checking on the header. */
4398 error_check_comp_unit_head (struct comp_unit_head *header,
4399 struct dwarf2_section_info *section,
4400 struct dwarf2_section_info *abbrev_section)
4402 const char *filename = get_section_file_name (section);
4404 if (header->version != 2 && header->version != 3 && header->version != 4)
4405 error (_("Dwarf Error: wrong version in compilation unit header "
4406 "(is %d, should be 2, 3, or 4) [in module %s]"), header->version,
4409 if (header->abbrev_offset.sect_off
4410 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
4411 error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header "
4412 "(offset 0x%lx + 6) [in module %s]"),
4413 (long) header->abbrev_offset.sect_off, (long) header->offset.sect_off,
4416 /* Cast to unsigned long to use 64-bit arithmetic when possible to
4417 avoid potential 32-bit overflow. */
4418 if (((unsigned long) header->offset.sect_off + get_cu_length (header))
4420 error (_("Dwarf Error: bad length (0x%lx) in compilation unit header "
4421 "(offset 0x%lx + 0) [in module %s]"),
4422 (long) header->length, (long) header->offset.sect_off,
4426 /* Read in a CU/TU header and perform some basic error checking.
4427 The contents of the header are stored in HEADER.
4428 The result is a pointer to the start of the first DIE. */
4430 static const gdb_byte *
4431 read_and_check_comp_unit_head (struct comp_unit_head *header,
4432 struct dwarf2_section_info *section,
4433 struct dwarf2_section_info *abbrev_section,
4434 const gdb_byte *info_ptr,
4435 int is_debug_types_section)
4437 const gdb_byte *beg_of_comp_unit = info_ptr;
4438 bfd *abfd = get_section_bfd_owner (section);
4440 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4442 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4444 /* If we're reading a type unit, skip over the signature and
4445 type_offset fields. */
4446 if (is_debug_types_section)
4447 info_ptr += 8 /*signature*/ + header->offset_size;
4449 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4451 error_check_comp_unit_head (header, section, abbrev_section);
4456 /* Read in the types comp unit header information from .debug_types entry at
4457 types_ptr. The result is a pointer to one past the end of the header. */
4459 static const gdb_byte *
4460 read_and_check_type_unit_head (struct comp_unit_head *header,
4461 struct dwarf2_section_info *section,
4462 struct dwarf2_section_info *abbrev_section,
4463 const gdb_byte *info_ptr,
4464 ULONGEST *signature,
4465 cu_offset *type_offset_in_tu)
4467 const gdb_byte *beg_of_comp_unit = info_ptr;
4468 bfd *abfd = get_section_bfd_owner (section);
4470 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4472 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4474 /* If we're reading a type unit, skip over the signature and
4475 type_offset fields. */
4476 if (signature != NULL)
4477 *signature = read_8_bytes (abfd, info_ptr);
4479 if (type_offset_in_tu != NULL)
4480 type_offset_in_tu->cu_off = read_offset_1 (abfd, info_ptr,
4481 header->offset_size);
4482 info_ptr += header->offset_size;
4484 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4486 error_check_comp_unit_head (header, section, abbrev_section);
4491 /* Fetch the abbreviation table offset from a comp or type unit header. */
4494 read_abbrev_offset (struct dwarf2_section_info *section,
4497 bfd *abfd = get_section_bfd_owner (section);
4498 const gdb_byte *info_ptr;
4499 unsigned int initial_length_size, offset_size;
4500 sect_offset abbrev_offset;
4502 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4503 info_ptr = section->buffer + offset.sect_off;
4504 read_initial_length (abfd, info_ptr, &initial_length_size);
4505 offset_size = initial_length_size == 4 ? 4 : 8;
4506 info_ptr += initial_length_size + 2 /*version*/;
4507 abbrev_offset.sect_off = read_offset_1 (abfd, info_ptr, offset_size);
4508 return abbrev_offset;
4511 /* Allocate a new partial symtab for file named NAME and mark this new
4512 partial symtab as being an include of PST. */
4515 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4516 struct objfile *objfile)
4518 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4520 if (!IS_ABSOLUTE_PATH (subpst->filename))
4522 /* It shares objfile->objfile_obstack. */
4523 subpst->dirname = pst->dirname;
4526 subpst->textlow = 0;
4527 subpst->texthigh = 0;
4529 subpst->dependencies
4530 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
4531 subpst->dependencies[0] = pst;
4532 subpst->number_of_dependencies = 1;
4534 subpst->globals_offset = 0;
4535 subpst->n_global_syms = 0;
4536 subpst->statics_offset = 0;
4537 subpst->n_static_syms = 0;
4538 subpst->compunit_symtab = NULL;
4539 subpst->read_symtab = pst->read_symtab;
4542 /* No private part is necessary for include psymtabs. This property
4543 can be used to differentiate between such include psymtabs and
4544 the regular ones. */
4545 subpst->read_symtab_private = NULL;
4548 /* Read the Line Number Program data and extract the list of files
4549 included by the source file represented by PST. Build an include
4550 partial symtab for each of these included files. */
4553 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4554 struct die_info *die,
4555 struct partial_symtab *pst)
4557 struct line_header *lh = NULL;
4558 struct attribute *attr;
4560 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4562 lh = dwarf_decode_line_header (DW_UNSND (attr), cu);
4564 return; /* No linetable, so no includes. */
4566 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4567 dwarf_decode_lines (lh, pst->dirname, cu, pst, pst->textlow, 1);
4569 free_line_header (lh);
4573 hash_signatured_type (const void *item)
4575 const struct signatured_type *sig_type
4576 = (const struct signatured_type *) item;
4578 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4579 return sig_type->signature;
4583 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4585 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
4586 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
4588 return lhs->signature == rhs->signature;
4591 /* Allocate a hash table for signatured types. */
4594 allocate_signatured_type_table (struct objfile *objfile)
4596 return htab_create_alloc_ex (41,
4597 hash_signatured_type,
4600 &objfile->objfile_obstack,
4601 hashtab_obstack_allocate,
4602 dummy_obstack_deallocate);
4605 /* A helper function to add a signatured type CU to a table. */
4608 add_signatured_type_cu_to_table (void **slot, void *datum)
4610 struct signatured_type *sigt = (struct signatured_type *) *slot;
4611 struct signatured_type ***datap = (struct signatured_type ***) datum;
4619 /* Create the hash table of all entries in the .debug_types
4620 (or .debug_types.dwo) section(s).
4621 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4622 otherwise it is NULL.
4624 The result is a pointer to the hash table or NULL if there are no types.
4626 Note: This function processes DWO files only, not DWP files. */
4629 create_debug_types_hash_table (struct dwo_file *dwo_file,
4630 VEC (dwarf2_section_info_def) *types)
4632 struct objfile *objfile = dwarf2_per_objfile->objfile;
4633 htab_t types_htab = NULL;
4635 struct dwarf2_section_info *section;
4636 struct dwarf2_section_info *abbrev_section;
4638 if (VEC_empty (dwarf2_section_info_def, types))
4641 abbrev_section = (dwo_file != NULL
4642 ? &dwo_file->sections.abbrev
4643 : &dwarf2_per_objfile->abbrev);
4645 if (dwarf_read_debug)
4646 fprintf_unfiltered (gdb_stdlog, "Reading .debug_types%s for %s:\n",
4647 dwo_file ? ".dwo" : "",
4648 get_section_file_name (abbrev_section));
4651 VEC_iterate (dwarf2_section_info_def, types, ix, section);
4655 const gdb_byte *info_ptr, *end_ptr;
4657 dwarf2_read_section (objfile, section);
4658 info_ptr = section->buffer;
4660 if (info_ptr == NULL)
4663 /* We can't set abfd until now because the section may be empty or
4664 not present, in which case the bfd is unknown. */
4665 abfd = get_section_bfd_owner (section);
4667 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4668 because we don't need to read any dies: the signature is in the
4671 end_ptr = info_ptr + section->size;
4672 while (info_ptr < end_ptr)
4675 cu_offset type_offset_in_tu;
4677 struct signatured_type *sig_type;
4678 struct dwo_unit *dwo_tu;
4680 const gdb_byte *ptr = info_ptr;
4681 struct comp_unit_head header;
4682 unsigned int length;
4684 offset.sect_off = ptr - section->buffer;
4686 /* We need to read the type's signature in order to build the hash
4687 table, but we don't need anything else just yet. */
4689 ptr = read_and_check_type_unit_head (&header, section,
4690 abbrev_section, ptr,
4691 &signature, &type_offset_in_tu);
4693 length = get_cu_length (&header);
4695 /* Skip dummy type units. */
4696 if (ptr >= info_ptr + length
4697 || peek_abbrev_code (abfd, ptr) == 0)
4703 if (types_htab == NULL)
4706 types_htab = allocate_dwo_unit_table (objfile);
4708 types_htab = allocate_signatured_type_table (objfile);
4714 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4716 dwo_tu->dwo_file = dwo_file;
4717 dwo_tu->signature = signature;
4718 dwo_tu->type_offset_in_tu = type_offset_in_tu;
4719 dwo_tu->section = section;
4720 dwo_tu->offset = offset;
4721 dwo_tu->length = length;
4725 /* N.B.: type_offset is not usable if this type uses a DWO file.
4726 The real type_offset is in the DWO file. */
4728 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4729 struct signatured_type);
4730 sig_type->signature = signature;
4731 sig_type->type_offset_in_tu = type_offset_in_tu;
4732 sig_type->per_cu.objfile = objfile;
4733 sig_type->per_cu.is_debug_types = 1;
4734 sig_type->per_cu.section = section;
4735 sig_type->per_cu.offset = offset;
4736 sig_type->per_cu.length = length;
4739 slot = htab_find_slot (types_htab,
4740 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4742 gdb_assert (slot != NULL);
4745 sect_offset dup_offset;
4749 const struct dwo_unit *dup_tu
4750 = (const struct dwo_unit *) *slot;
4752 dup_offset = dup_tu->offset;
4756 const struct signatured_type *dup_tu
4757 = (const struct signatured_type *) *slot;
4759 dup_offset = dup_tu->per_cu.offset;
4762 complaint (&symfile_complaints,
4763 _("debug type entry at offset 0x%x is duplicate to"
4764 " the entry at offset 0x%x, signature %s"),
4765 offset.sect_off, dup_offset.sect_off,
4766 hex_string (signature));
4768 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4770 if (dwarf_read_debug > 1)
4771 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
4773 hex_string (signature));
4782 /* Create the hash table of all entries in the .debug_types section,
4783 and initialize all_type_units.
4784 The result is zero if there is an error (e.g. missing .debug_types section),
4785 otherwise non-zero. */
4788 create_all_type_units (struct objfile *objfile)
4791 struct signatured_type **iter;
4793 types_htab = create_debug_types_hash_table (NULL, dwarf2_per_objfile->types);
4794 if (types_htab == NULL)
4796 dwarf2_per_objfile->signatured_types = NULL;
4800 dwarf2_per_objfile->signatured_types = types_htab;
4802 dwarf2_per_objfile->n_type_units
4803 = dwarf2_per_objfile->n_allocated_type_units
4804 = htab_elements (types_htab);
4805 dwarf2_per_objfile->all_type_units =
4806 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
4807 iter = &dwarf2_per_objfile->all_type_units[0];
4808 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
4809 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
4810 == dwarf2_per_objfile->n_type_units);
4815 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
4816 If SLOT is non-NULL, it is the entry to use in the hash table.
4817 Otherwise we find one. */
4819 static struct signatured_type *
4820 add_type_unit (ULONGEST sig, void **slot)
4822 struct objfile *objfile = dwarf2_per_objfile->objfile;
4823 int n_type_units = dwarf2_per_objfile->n_type_units;
4824 struct signatured_type *sig_type;
4826 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
4828 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
4830 if (dwarf2_per_objfile->n_allocated_type_units == 0)
4831 dwarf2_per_objfile->n_allocated_type_units = 1;
4832 dwarf2_per_objfile->n_allocated_type_units *= 2;
4833 dwarf2_per_objfile->all_type_units
4834 = XRESIZEVEC (struct signatured_type *,
4835 dwarf2_per_objfile->all_type_units,
4836 dwarf2_per_objfile->n_allocated_type_units);
4837 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
4839 dwarf2_per_objfile->n_type_units = n_type_units;
4841 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4842 struct signatured_type);
4843 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
4844 sig_type->signature = sig;
4845 sig_type->per_cu.is_debug_types = 1;
4846 if (dwarf2_per_objfile->using_index)
4848 sig_type->per_cu.v.quick =
4849 OBSTACK_ZALLOC (&objfile->objfile_obstack,
4850 struct dwarf2_per_cu_quick_data);
4855 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
4858 gdb_assert (*slot == NULL);
4860 /* The rest of sig_type must be filled in by the caller. */
4864 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
4865 Fill in SIG_ENTRY with DWO_ENTRY. */
4868 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
4869 struct signatured_type *sig_entry,
4870 struct dwo_unit *dwo_entry)
4872 /* Make sure we're not clobbering something we don't expect to. */
4873 gdb_assert (! sig_entry->per_cu.queued);
4874 gdb_assert (sig_entry->per_cu.cu == NULL);
4875 if (dwarf2_per_objfile->using_index)
4877 gdb_assert (sig_entry->per_cu.v.quick != NULL);
4878 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
4881 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
4882 gdb_assert (sig_entry->signature == dwo_entry->signature);
4883 gdb_assert (sig_entry->type_offset_in_section.sect_off == 0);
4884 gdb_assert (sig_entry->type_unit_group == NULL);
4885 gdb_assert (sig_entry->dwo_unit == NULL);
4887 sig_entry->per_cu.section = dwo_entry->section;
4888 sig_entry->per_cu.offset = dwo_entry->offset;
4889 sig_entry->per_cu.length = dwo_entry->length;
4890 sig_entry->per_cu.reading_dwo_directly = 1;
4891 sig_entry->per_cu.objfile = objfile;
4892 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
4893 sig_entry->dwo_unit = dwo_entry;
4896 /* Subroutine of lookup_signatured_type.
4897 If we haven't read the TU yet, create the signatured_type data structure
4898 for a TU to be read in directly from a DWO file, bypassing the stub.
4899 This is the "Stay in DWO Optimization": When there is no DWP file and we're
4900 using .gdb_index, then when reading a CU we want to stay in the DWO file
4901 containing that CU. Otherwise we could end up reading several other DWO
4902 files (due to comdat folding) to process the transitive closure of all the
4903 mentioned TUs, and that can be slow. The current DWO file will have every
4904 type signature that it needs.
4905 We only do this for .gdb_index because in the psymtab case we already have
4906 to read all the DWOs to build the type unit groups. */
4908 static struct signatured_type *
4909 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4911 struct objfile *objfile = dwarf2_per_objfile->objfile;
4912 struct dwo_file *dwo_file;
4913 struct dwo_unit find_dwo_entry, *dwo_entry;
4914 struct signatured_type find_sig_entry, *sig_entry;
4917 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4919 /* If TU skeletons have been removed then we may not have read in any
4921 if (dwarf2_per_objfile->signatured_types == NULL)
4923 dwarf2_per_objfile->signatured_types
4924 = allocate_signatured_type_table (objfile);
4927 /* We only ever need to read in one copy of a signatured type.
4928 Use the global signatured_types array to do our own comdat-folding
4929 of types. If this is the first time we're reading this TU, and
4930 the TU has an entry in .gdb_index, replace the recorded data from
4931 .gdb_index with this TU. */
4933 find_sig_entry.signature = sig;
4934 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
4935 &find_sig_entry, INSERT);
4936 sig_entry = (struct signatured_type *) *slot;
4938 /* We can get here with the TU already read, *or* in the process of being
4939 read. Don't reassign the global entry to point to this DWO if that's
4940 the case. Also note that if the TU is already being read, it may not
4941 have come from a DWO, the program may be a mix of Fission-compiled
4942 code and non-Fission-compiled code. */
4944 /* Have we already tried to read this TU?
4945 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
4946 needn't exist in the global table yet). */
4947 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
4950 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
4951 dwo_unit of the TU itself. */
4952 dwo_file = cu->dwo_unit->dwo_file;
4954 /* Ok, this is the first time we're reading this TU. */
4955 if (dwo_file->tus == NULL)
4957 find_dwo_entry.signature = sig;
4958 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
4959 if (dwo_entry == NULL)
4962 /* If the global table doesn't have an entry for this TU, add one. */
4963 if (sig_entry == NULL)
4964 sig_entry = add_type_unit (sig, slot);
4966 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
4967 sig_entry->per_cu.tu_read = 1;
4971 /* Subroutine of lookup_signatured_type.
4972 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
4973 then try the DWP file. If the TU stub (skeleton) has been removed then
4974 it won't be in .gdb_index. */
4976 static struct signatured_type *
4977 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4979 struct objfile *objfile = dwarf2_per_objfile->objfile;
4980 struct dwp_file *dwp_file = get_dwp_file ();
4981 struct dwo_unit *dwo_entry;
4982 struct signatured_type find_sig_entry, *sig_entry;
4985 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4986 gdb_assert (dwp_file != NULL);
4988 /* If TU skeletons have been removed then we may not have read in any
4990 if (dwarf2_per_objfile->signatured_types == NULL)
4992 dwarf2_per_objfile->signatured_types
4993 = allocate_signatured_type_table (objfile);
4996 find_sig_entry.signature = sig;
4997 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
4998 &find_sig_entry, INSERT);
4999 sig_entry = (struct signatured_type *) *slot;
5001 /* Have we already tried to read this TU?
5002 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
5003 needn't exist in the global table yet). */
5004 if (sig_entry != NULL)
5007 if (dwp_file->tus == NULL)
5009 dwo_entry = lookup_dwo_unit_in_dwp (dwp_file, NULL,
5010 sig, 1 /* is_debug_types */);
5011 if (dwo_entry == NULL)
5014 sig_entry = add_type_unit (sig, slot);
5015 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
5020 /* Lookup a signature based type for DW_FORM_ref_sig8.
5021 Returns NULL if signature SIG is not present in the table.
5022 It is up to the caller to complain about this. */
5024 static struct signatured_type *
5025 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5028 && dwarf2_per_objfile->using_index)
5030 /* We're in a DWO/DWP file, and we're using .gdb_index.
5031 These cases require special processing. */
5032 if (get_dwp_file () == NULL)
5033 return lookup_dwo_signatured_type (cu, sig);
5035 return lookup_dwp_signatured_type (cu, sig);
5039 struct signatured_type find_entry, *entry;
5041 if (dwarf2_per_objfile->signatured_types == NULL)
5043 find_entry.signature = sig;
5044 entry = ((struct signatured_type *)
5045 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
5050 /* Low level DIE reading support. */
5052 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
5055 init_cu_die_reader (struct die_reader_specs *reader,
5056 struct dwarf2_cu *cu,
5057 struct dwarf2_section_info *section,
5058 struct dwo_file *dwo_file)
5060 gdb_assert (section->readin && section->buffer != NULL);
5061 reader->abfd = get_section_bfd_owner (section);
5063 reader->dwo_file = dwo_file;
5064 reader->die_section = section;
5065 reader->buffer = section->buffer;
5066 reader->buffer_end = section->buffer + section->size;
5067 reader->comp_dir = NULL;
5070 /* Subroutine of init_cutu_and_read_dies to simplify it.
5071 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
5072 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
5075 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
5076 from it to the DIE in the DWO. If NULL we are skipping the stub.
5077 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
5078 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
5079 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
5080 STUB_COMP_DIR may be non-NULL.
5081 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
5082 are filled in with the info of the DIE from the DWO file.
5083 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
5084 provided an abbrev table to use.
5085 The result is non-zero if a valid (non-dummy) DIE was found. */
5088 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
5089 struct dwo_unit *dwo_unit,
5090 int abbrev_table_provided,
5091 struct die_info *stub_comp_unit_die,
5092 const char *stub_comp_dir,
5093 struct die_reader_specs *result_reader,
5094 const gdb_byte **result_info_ptr,
5095 struct die_info **result_comp_unit_die,
5096 int *result_has_children)
5098 struct objfile *objfile = dwarf2_per_objfile->objfile;
5099 struct dwarf2_cu *cu = this_cu->cu;
5100 struct dwarf2_section_info *section;
5102 const gdb_byte *begin_info_ptr, *info_ptr;
5103 ULONGEST signature; /* Or dwo_id. */
5104 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
5105 int i,num_extra_attrs;
5106 struct dwarf2_section_info *dwo_abbrev_section;
5107 struct attribute *attr;
5108 struct die_info *comp_unit_die;
5110 /* At most one of these may be provided. */
5111 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
5113 /* These attributes aren't processed until later:
5114 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
5115 DW_AT_comp_dir is used now, to find the DWO file, but it is also
5116 referenced later. However, these attributes are found in the stub
5117 which we won't have later. In order to not impose this complication
5118 on the rest of the code, we read them here and copy them to the
5127 if (stub_comp_unit_die != NULL)
5129 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
5131 if (! this_cu->is_debug_types)
5132 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
5133 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
5134 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
5135 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
5136 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
5138 /* There should be a DW_AT_addr_base attribute here (if needed).
5139 We need the value before we can process DW_FORM_GNU_addr_index. */
5141 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
5143 cu->addr_base = DW_UNSND (attr);
5145 /* There should be a DW_AT_ranges_base attribute here (if needed).
5146 We need the value before we can process DW_AT_ranges. */
5147 cu->ranges_base = 0;
5148 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
5150 cu->ranges_base = DW_UNSND (attr);
5152 else if (stub_comp_dir != NULL)
5154 /* Reconstruct the comp_dir attribute to simplify the code below. */
5155 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
5156 comp_dir->name = DW_AT_comp_dir;
5157 comp_dir->form = DW_FORM_string;
5158 DW_STRING_IS_CANONICAL (comp_dir) = 0;
5159 DW_STRING (comp_dir) = stub_comp_dir;
5162 /* Set up for reading the DWO CU/TU. */
5163 cu->dwo_unit = dwo_unit;
5164 section = dwo_unit->section;
5165 dwarf2_read_section (objfile, section);
5166 abfd = get_section_bfd_owner (section);
5167 begin_info_ptr = info_ptr = section->buffer + dwo_unit->offset.sect_off;
5168 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
5169 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
5171 if (this_cu->is_debug_types)
5173 ULONGEST header_signature;
5174 cu_offset type_offset_in_tu;
5175 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
5177 info_ptr = read_and_check_type_unit_head (&cu->header, section,
5181 &type_offset_in_tu);
5182 /* This is not an assert because it can be caused by bad debug info. */
5183 if (sig_type->signature != header_signature)
5185 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
5186 " TU at offset 0x%x [in module %s]"),
5187 hex_string (sig_type->signature),
5188 hex_string (header_signature),
5189 dwo_unit->offset.sect_off,
5190 bfd_get_filename (abfd));
5192 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
5193 /* For DWOs coming from DWP files, we don't know the CU length
5194 nor the type's offset in the TU until now. */
5195 dwo_unit->length = get_cu_length (&cu->header);
5196 dwo_unit->type_offset_in_tu = type_offset_in_tu;
5198 /* Establish the type offset that can be used to lookup the type.
5199 For DWO files, we don't know it until now. */
5200 sig_type->type_offset_in_section.sect_off =
5201 dwo_unit->offset.sect_off + dwo_unit->type_offset_in_tu.cu_off;
5205 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5208 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
5209 /* For DWOs coming from DWP files, we don't know the CU length
5211 dwo_unit->length = get_cu_length (&cu->header);
5214 /* Replace the CU's original abbrev table with the DWO's.
5215 Reminder: We can't read the abbrev table until we've read the header. */
5216 if (abbrev_table_provided)
5218 /* Don't free the provided abbrev table, the caller of
5219 init_cutu_and_read_dies owns it. */
5220 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5221 /* Ensure the DWO abbrev table gets freed. */
5222 make_cleanup (dwarf2_free_abbrev_table, cu);
5226 dwarf2_free_abbrev_table (cu);
5227 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5228 /* Leave any existing abbrev table cleanup as is. */
5231 /* Read in the die, but leave space to copy over the attributes
5232 from the stub. This has the benefit of simplifying the rest of
5233 the code - all the work to maintain the illusion of a single
5234 DW_TAG_{compile,type}_unit DIE is done here. */
5235 num_extra_attrs = ((stmt_list != NULL)
5239 + (comp_dir != NULL));
5240 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
5241 result_has_children, num_extra_attrs);
5243 /* Copy over the attributes from the stub to the DIE we just read in. */
5244 comp_unit_die = *result_comp_unit_die;
5245 i = comp_unit_die->num_attrs;
5246 if (stmt_list != NULL)
5247 comp_unit_die->attrs[i++] = *stmt_list;
5249 comp_unit_die->attrs[i++] = *low_pc;
5250 if (high_pc != NULL)
5251 comp_unit_die->attrs[i++] = *high_pc;
5253 comp_unit_die->attrs[i++] = *ranges;
5254 if (comp_dir != NULL)
5255 comp_unit_die->attrs[i++] = *comp_dir;
5256 comp_unit_die->num_attrs += num_extra_attrs;
5258 if (dwarf_die_debug)
5260 fprintf_unfiltered (gdb_stdlog,
5261 "Read die from %s@0x%x of %s:\n",
5262 get_section_name (section),
5263 (unsigned) (begin_info_ptr - section->buffer),
5264 bfd_get_filename (abfd));
5265 dump_die (comp_unit_die, dwarf_die_debug);
5268 /* Save the comp_dir attribute. If there is no DWP file then we'll read
5269 TUs by skipping the stub and going directly to the entry in the DWO file.
5270 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
5271 to get it via circuitous means. Blech. */
5272 if (comp_dir != NULL)
5273 result_reader->comp_dir = DW_STRING (comp_dir);
5275 /* Skip dummy compilation units. */
5276 if (info_ptr >= begin_info_ptr + dwo_unit->length
5277 || peek_abbrev_code (abfd, info_ptr) == 0)
5280 *result_info_ptr = info_ptr;
5284 /* Subroutine of init_cutu_and_read_dies to simplify it.
5285 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
5286 Returns NULL if the specified DWO unit cannot be found. */
5288 static struct dwo_unit *
5289 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
5290 struct die_info *comp_unit_die)
5292 struct dwarf2_cu *cu = this_cu->cu;
5293 struct attribute *attr;
5295 struct dwo_unit *dwo_unit;
5296 const char *comp_dir, *dwo_name;
5298 gdb_assert (cu != NULL);
5300 /* Yeah, we look dwo_name up again, but it simplifies the code. */
5301 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5302 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
5304 if (this_cu->is_debug_types)
5306 struct signatured_type *sig_type;
5308 /* Since this_cu is the first member of struct signatured_type,
5309 we can go from a pointer to one to a pointer to the other. */
5310 sig_type = (struct signatured_type *) this_cu;
5311 signature = sig_type->signature;
5312 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
5316 struct attribute *attr;
5318 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
5320 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
5322 dwo_name, objfile_name (this_cu->objfile));
5323 signature = DW_UNSND (attr);
5324 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
5331 /* Subroutine of init_cutu_and_read_dies to simplify it.
5332 See it for a description of the parameters.
5333 Read a TU directly from a DWO file, bypassing the stub.
5335 Note: This function could be a little bit simpler if we shared cleanups
5336 with our caller, init_cutu_and_read_dies. That's generally a fragile thing
5337 to do, so we keep this function self-contained. Or we could move this
5338 into our caller, but it's complex enough already. */
5341 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
5342 int use_existing_cu, int keep,
5343 die_reader_func_ftype *die_reader_func,
5346 struct dwarf2_cu *cu;
5347 struct signatured_type *sig_type;
5348 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5349 struct die_reader_specs reader;
5350 const gdb_byte *info_ptr;
5351 struct die_info *comp_unit_die;
5354 /* Verify we can do the following downcast, and that we have the
5356 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
5357 sig_type = (struct signatured_type *) this_cu;
5358 gdb_assert (sig_type->dwo_unit != NULL);
5360 cleanups = make_cleanup (null_cleanup, NULL);
5362 if (use_existing_cu && this_cu->cu != NULL)
5364 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
5366 /* There's no need to do the rereading_dwo_cu handling that
5367 init_cutu_and_read_dies does since we don't read the stub. */
5371 /* If !use_existing_cu, this_cu->cu must be NULL. */
5372 gdb_assert (this_cu->cu == NULL);
5373 cu = XNEW (struct dwarf2_cu);
5374 init_one_comp_unit (cu, this_cu);
5375 /* If an error occurs while loading, release our storage. */
5376 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5379 /* A future optimization, if needed, would be to use an existing
5380 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
5381 could share abbrev tables. */
5383 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
5384 0 /* abbrev_table_provided */,
5385 NULL /* stub_comp_unit_die */,
5386 sig_type->dwo_unit->dwo_file->comp_dir,
5388 &comp_unit_die, &has_children) == 0)
5391 do_cleanups (cleanups);
5395 /* All the "real" work is done here. */
5396 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5398 /* This duplicates the code in init_cutu_and_read_dies,
5399 but the alternative is making the latter more complex.
5400 This function is only for the special case of using DWO files directly:
5401 no point in overly complicating the general case just to handle this. */
5402 if (free_cu_cleanup != NULL)
5406 /* We've successfully allocated this compilation unit. Let our
5407 caller clean it up when finished with it. */
5408 discard_cleanups (free_cu_cleanup);
5410 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5411 So we have to manually free the abbrev table. */
5412 dwarf2_free_abbrev_table (cu);
5414 /* Link this CU into read_in_chain. */
5415 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5416 dwarf2_per_objfile->read_in_chain = this_cu;
5419 do_cleanups (free_cu_cleanup);
5422 do_cleanups (cleanups);
5425 /* Initialize a CU (or TU) and read its DIEs.
5426 If the CU defers to a DWO file, read the DWO file as well.
5428 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
5429 Otherwise the table specified in the comp unit header is read in and used.
5430 This is an optimization for when we already have the abbrev table.
5432 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
5433 Otherwise, a new CU is allocated with xmalloc.
5435 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
5436 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
5438 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5439 linker) then DIE_READER_FUNC will not get called. */
5442 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
5443 struct abbrev_table *abbrev_table,
5444 int use_existing_cu, int keep,
5445 die_reader_func_ftype *die_reader_func,
5448 struct objfile *objfile = dwarf2_per_objfile->objfile;
5449 struct dwarf2_section_info *section = this_cu->section;
5450 bfd *abfd = get_section_bfd_owner (section);
5451 struct dwarf2_cu *cu;
5452 const gdb_byte *begin_info_ptr, *info_ptr;
5453 struct die_reader_specs reader;
5454 struct die_info *comp_unit_die;
5456 struct attribute *attr;
5457 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5458 struct signatured_type *sig_type = NULL;
5459 struct dwarf2_section_info *abbrev_section;
5460 /* Non-zero if CU currently points to a DWO file and we need to
5461 reread it. When this happens we need to reread the skeleton die
5462 before we can reread the DWO file (this only applies to CUs, not TUs). */
5463 int rereading_dwo_cu = 0;
5465 if (dwarf_die_debug)
5466 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5467 this_cu->is_debug_types ? "type" : "comp",
5468 this_cu->offset.sect_off);
5470 if (use_existing_cu)
5473 /* If we're reading a TU directly from a DWO file, including a virtual DWO
5474 file (instead of going through the stub), short-circuit all of this. */
5475 if (this_cu->reading_dwo_directly)
5477 /* Narrow down the scope of possibilities to have to understand. */
5478 gdb_assert (this_cu->is_debug_types);
5479 gdb_assert (abbrev_table == NULL);
5480 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
5481 die_reader_func, data);
5485 cleanups = make_cleanup (null_cleanup, NULL);
5487 /* This is cheap if the section is already read in. */
5488 dwarf2_read_section (objfile, section);
5490 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5492 abbrev_section = get_abbrev_section_for_cu (this_cu);
5494 if (use_existing_cu && this_cu->cu != NULL)
5497 /* If this CU is from a DWO file we need to start over, we need to
5498 refetch the attributes from the skeleton CU.
5499 This could be optimized by retrieving those attributes from when we
5500 were here the first time: the previous comp_unit_die was stored in
5501 comp_unit_obstack. But there's no data yet that we need this
5503 if (cu->dwo_unit != NULL)
5504 rereading_dwo_cu = 1;
5508 /* If !use_existing_cu, this_cu->cu must be NULL. */
5509 gdb_assert (this_cu->cu == NULL);
5510 cu = XNEW (struct dwarf2_cu);
5511 init_one_comp_unit (cu, this_cu);
5512 /* If an error occurs while loading, release our storage. */
5513 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5516 /* Get the header. */
5517 if (cu->header.first_die_offset.cu_off != 0 && ! rereading_dwo_cu)
5519 /* We already have the header, there's no need to read it in again. */
5520 info_ptr += cu->header.first_die_offset.cu_off;
5524 if (this_cu->is_debug_types)
5527 cu_offset type_offset_in_tu;
5529 info_ptr = read_and_check_type_unit_head (&cu->header, section,
5530 abbrev_section, info_ptr,
5532 &type_offset_in_tu);
5534 /* Since per_cu is the first member of struct signatured_type,
5535 we can go from a pointer to one to a pointer to the other. */
5536 sig_type = (struct signatured_type *) this_cu;
5537 gdb_assert (sig_type->signature == signature);
5538 gdb_assert (sig_type->type_offset_in_tu.cu_off
5539 == type_offset_in_tu.cu_off);
5540 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5542 /* LENGTH has not been set yet for type units if we're
5543 using .gdb_index. */
5544 this_cu->length = get_cu_length (&cu->header);
5546 /* Establish the type offset that can be used to lookup the type. */
5547 sig_type->type_offset_in_section.sect_off =
5548 this_cu->offset.sect_off + sig_type->type_offset_in_tu.cu_off;
5552 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5556 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5557 gdb_assert (this_cu->length == get_cu_length (&cu->header));
5561 /* Skip dummy compilation units. */
5562 if (info_ptr >= begin_info_ptr + this_cu->length
5563 || peek_abbrev_code (abfd, info_ptr) == 0)
5565 do_cleanups (cleanups);
5569 /* If we don't have them yet, read the abbrevs for this compilation unit.
5570 And if we need to read them now, make sure they're freed when we're
5571 done. Note that it's important that if the CU had an abbrev table
5572 on entry we don't free it when we're done: Somewhere up the call stack
5573 it may be in use. */
5574 if (abbrev_table != NULL)
5576 gdb_assert (cu->abbrev_table == NULL);
5577 gdb_assert (cu->header.abbrev_offset.sect_off
5578 == abbrev_table->offset.sect_off);
5579 cu->abbrev_table = abbrev_table;
5581 else if (cu->abbrev_table == NULL)
5583 dwarf2_read_abbrevs (cu, abbrev_section);
5584 make_cleanup (dwarf2_free_abbrev_table, cu);
5586 else if (rereading_dwo_cu)
5588 dwarf2_free_abbrev_table (cu);
5589 dwarf2_read_abbrevs (cu, abbrev_section);
5592 /* Read the top level CU/TU die. */
5593 init_cu_die_reader (&reader, cu, section, NULL);
5594 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5596 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
5598 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
5599 DWO CU, that this test will fail (the attribute will not be present). */
5600 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5603 struct dwo_unit *dwo_unit;
5604 struct die_info *dwo_comp_unit_die;
5608 complaint (&symfile_complaints,
5609 _("compilation unit with DW_AT_GNU_dwo_name"
5610 " has children (offset 0x%x) [in module %s]"),
5611 this_cu->offset.sect_off, bfd_get_filename (abfd));
5613 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
5614 if (dwo_unit != NULL)
5616 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
5617 abbrev_table != NULL,
5618 comp_unit_die, NULL,
5620 &dwo_comp_unit_die, &has_children) == 0)
5623 do_cleanups (cleanups);
5626 comp_unit_die = dwo_comp_unit_die;
5630 /* Yikes, we couldn't find the rest of the DIE, we only have
5631 the stub. A complaint has already been logged. There's
5632 not much more we can do except pass on the stub DIE to
5633 die_reader_func. We don't want to throw an error on bad
5638 /* All of the above is setup for this call. Yikes. */
5639 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5641 /* Done, clean up. */
5642 if (free_cu_cleanup != NULL)
5646 /* We've successfully allocated this compilation unit. Let our
5647 caller clean it up when finished with it. */
5648 discard_cleanups (free_cu_cleanup);
5650 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5651 So we have to manually free the abbrev table. */
5652 dwarf2_free_abbrev_table (cu);
5654 /* Link this CU into read_in_chain. */
5655 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5656 dwarf2_per_objfile->read_in_chain = this_cu;
5659 do_cleanups (free_cu_cleanup);
5662 do_cleanups (cleanups);
5665 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
5666 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
5667 to have already done the lookup to find the DWO file).
5669 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
5670 THIS_CU->is_debug_types, but nothing else.
5672 We fill in THIS_CU->length.
5674 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5675 linker) then DIE_READER_FUNC will not get called.
5677 THIS_CU->cu is always freed when done.
5678 This is done in order to not leave THIS_CU->cu in a state where we have
5679 to care whether it refers to the "main" CU or the DWO CU. */
5682 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
5683 struct dwo_file *dwo_file,
5684 die_reader_func_ftype *die_reader_func,
5687 struct objfile *objfile = dwarf2_per_objfile->objfile;
5688 struct dwarf2_section_info *section = this_cu->section;
5689 bfd *abfd = get_section_bfd_owner (section);
5690 struct dwarf2_section_info *abbrev_section;
5691 struct dwarf2_cu cu;
5692 const gdb_byte *begin_info_ptr, *info_ptr;
5693 struct die_reader_specs reader;
5694 struct cleanup *cleanups;
5695 struct die_info *comp_unit_die;
5698 if (dwarf_die_debug)
5699 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5700 this_cu->is_debug_types ? "type" : "comp",
5701 this_cu->offset.sect_off);
5703 gdb_assert (this_cu->cu == NULL);
5705 abbrev_section = (dwo_file != NULL
5706 ? &dwo_file->sections.abbrev
5707 : get_abbrev_section_for_cu (this_cu));
5709 /* This is cheap if the section is already read in. */
5710 dwarf2_read_section (objfile, section);
5712 init_one_comp_unit (&cu, this_cu);
5714 cleanups = make_cleanup (free_stack_comp_unit, &cu);
5716 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5717 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
5718 abbrev_section, info_ptr,
5719 this_cu->is_debug_types);
5721 this_cu->length = get_cu_length (&cu.header);
5723 /* Skip dummy compilation units. */
5724 if (info_ptr >= begin_info_ptr + this_cu->length
5725 || peek_abbrev_code (abfd, info_ptr) == 0)
5727 do_cleanups (cleanups);
5731 dwarf2_read_abbrevs (&cu, abbrev_section);
5732 make_cleanup (dwarf2_free_abbrev_table, &cu);
5734 init_cu_die_reader (&reader, &cu, section, dwo_file);
5735 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5737 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5739 do_cleanups (cleanups);
5742 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
5743 does not lookup the specified DWO file.
5744 This cannot be used to read DWO files.
5746 THIS_CU->cu is always freed when done.
5747 This is done in order to not leave THIS_CU->cu in a state where we have
5748 to care whether it refers to the "main" CU or the DWO CU.
5749 We can revisit this if the data shows there's a performance issue. */
5752 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
5753 die_reader_func_ftype *die_reader_func,
5756 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
5759 /* Type Unit Groups.
5761 Type Unit Groups are a way to collapse the set of all TUs (type units) into
5762 a more manageable set. The grouping is done by DW_AT_stmt_list entry
5763 so that all types coming from the same compilation (.o file) are grouped
5764 together. A future step could be to put the types in the same symtab as
5765 the CU the types ultimately came from. */
5768 hash_type_unit_group (const void *item)
5770 const struct type_unit_group *tu_group
5771 = (const struct type_unit_group *) item;
5773 return hash_stmt_list_entry (&tu_group->hash);
5777 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
5779 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
5780 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
5782 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
5785 /* Allocate a hash table for type unit groups. */
5788 allocate_type_unit_groups_table (void)
5790 return htab_create_alloc_ex (3,
5791 hash_type_unit_group,
5794 &dwarf2_per_objfile->objfile->objfile_obstack,
5795 hashtab_obstack_allocate,
5796 dummy_obstack_deallocate);
5799 /* Type units that don't have DW_AT_stmt_list are grouped into their own
5800 partial symtabs. We combine several TUs per psymtab to not let the size
5801 of any one psymtab grow too big. */
5802 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
5803 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
5805 /* Helper routine for get_type_unit_group.
5806 Create the type_unit_group object used to hold one or more TUs. */
5808 static struct type_unit_group *
5809 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
5811 struct objfile *objfile = dwarf2_per_objfile->objfile;
5812 struct dwarf2_per_cu_data *per_cu;
5813 struct type_unit_group *tu_group;
5815 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5816 struct type_unit_group);
5817 per_cu = &tu_group->per_cu;
5818 per_cu->objfile = objfile;
5820 if (dwarf2_per_objfile->using_index)
5822 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5823 struct dwarf2_per_cu_quick_data);
5827 unsigned int line_offset = line_offset_struct.sect_off;
5828 struct partial_symtab *pst;
5831 /* Give the symtab a useful name for debug purposes. */
5832 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
5833 name = xstrprintf ("<type_units_%d>",
5834 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
5836 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
5838 pst = create_partial_symtab (per_cu, name);
5844 tu_group->hash.dwo_unit = cu->dwo_unit;
5845 tu_group->hash.line_offset = line_offset_struct;
5850 /* Look up the type_unit_group for type unit CU, and create it if necessary.
5851 STMT_LIST is a DW_AT_stmt_list attribute. */
5853 static struct type_unit_group *
5854 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
5856 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5857 struct type_unit_group *tu_group;
5859 unsigned int line_offset;
5860 struct type_unit_group type_unit_group_for_lookup;
5862 if (dwarf2_per_objfile->type_unit_groups == NULL)
5864 dwarf2_per_objfile->type_unit_groups =
5865 allocate_type_unit_groups_table ();
5868 /* Do we need to create a new group, or can we use an existing one? */
5872 line_offset = DW_UNSND (stmt_list);
5873 ++tu_stats->nr_symtab_sharers;
5877 /* Ugh, no stmt_list. Rare, but we have to handle it.
5878 We can do various things here like create one group per TU or
5879 spread them over multiple groups to split up the expansion work.
5880 To avoid worst case scenarios (too many groups or too large groups)
5881 we, umm, group them in bunches. */
5882 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
5883 | (tu_stats->nr_stmt_less_type_units
5884 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
5885 ++tu_stats->nr_stmt_less_type_units;
5888 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
5889 type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset;
5890 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
5891 &type_unit_group_for_lookup, INSERT);
5894 tu_group = (struct type_unit_group *) *slot;
5895 gdb_assert (tu_group != NULL);
5899 sect_offset line_offset_struct;
5901 line_offset_struct.sect_off = line_offset;
5902 tu_group = create_type_unit_group (cu, line_offset_struct);
5904 ++tu_stats->nr_symtabs;
5910 /* Partial symbol tables. */
5912 /* Create a psymtab named NAME and assign it to PER_CU.
5914 The caller must fill in the following details:
5915 dirname, textlow, texthigh. */
5917 static struct partial_symtab *
5918 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
5920 struct objfile *objfile = per_cu->objfile;
5921 struct partial_symtab *pst;
5923 pst = start_psymtab_common (objfile, name, 0,
5924 objfile->global_psymbols.next,
5925 objfile->static_psymbols.next);
5927 pst->psymtabs_addrmap_supported = 1;
5929 /* This is the glue that links PST into GDB's symbol API. */
5930 pst->read_symtab_private = per_cu;
5931 pst->read_symtab = dwarf2_read_symtab;
5932 per_cu->v.psymtab = pst;
5937 /* The DATA object passed to process_psymtab_comp_unit_reader has this
5940 struct process_psymtab_comp_unit_data
5942 /* True if we are reading a DW_TAG_partial_unit. */
5944 int want_partial_unit;
5946 /* The "pretend" language that is used if the CU doesn't declare a
5949 enum language pretend_language;
5952 /* die_reader_func for process_psymtab_comp_unit. */
5955 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
5956 const gdb_byte *info_ptr,
5957 struct die_info *comp_unit_die,
5961 struct dwarf2_cu *cu = reader->cu;
5962 struct objfile *objfile = cu->objfile;
5963 struct gdbarch *gdbarch = get_objfile_arch (objfile);
5964 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5966 CORE_ADDR best_lowpc = 0, best_highpc = 0;
5967 struct partial_symtab *pst;
5968 enum pc_bounds_kind cu_bounds_kind;
5969 const char *filename;
5970 struct process_psymtab_comp_unit_data *info
5971 = (struct process_psymtab_comp_unit_data *) data;
5973 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
5976 gdb_assert (! per_cu->is_debug_types);
5978 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
5980 cu->list_in_scope = &file_symbols;
5982 /* Allocate a new partial symbol table structure. */
5983 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
5984 if (filename == NULL)
5987 pst = create_partial_symtab (per_cu, filename);
5989 /* This must be done before calling dwarf2_build_include_psymtabs. */
5990 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
5992 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
5994 dwarf2_find_base_address (comp_unit_die, cu);
5996 /* Possibly set the default values of LOWPC and HIGHPC from
5998 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
5999 &best_highpc, cu, pst);
6000 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
6001 /* Store the contiguous range if it is not empty; it can be empty for
6002 CUs with no code. */
6003 addrmap_set_empty (objfile->psymtabs_addrmap,
6004 gdbarch_adjust_dwarf2_addr (gdbarch,
6005 best_lowpc + baseaddr),
6006 gdbarch_adjust_dwarf2_addr (gdbarch,
6007 best_highpc + baseaddr) - 1,
6010 /* Check if comp unit has_children.
6011 If so, read the rest of the partial symbols from this comp unit.
6012 If not, there's no more debug_info for this comp unit. */
6015 struct partial_die_info *first_die;
6016 CORE_ADDR lowpc, highpc;
6018 lowpc = ((CORE_ADDR) -1);
6019 highpc = ((CORE_ADDR) 0);
6021 first_die = load_partial_dies (reader, info_ptr, 1);
6023 scan_partial_symbols (first_die, &lowpc, &highpc,
6024 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
6026 /* If we didn't find a lowpc, set it to highpc to avoid
6027 complaints from `maint check'. */
6028 if (lowpc == ((CORE_ADDR) -1))
6031 /* If the compilation unit didn't have an explicit address range,
6032 then use the information extracted from its child dies. */
6033 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
6036 best_highpc = highpc;
6039 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
6040 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
6042 end_psymtab_common (objfile, pst);
6044 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
6047 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6048 struct dwarf2_per_cu_data *iter;
6050 /* Fill in 'dependencies' here; we fill in 'users' in a
6052 pst->number_of_dependencies = len;
6054 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
6056 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
6059 pst->dependencies[i] = iter->v.psymtab;
6061 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6064 /* Get the list of files included in the current compilation unit,
6065 and build a psymtab for each of them. */
6066 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
6068 if (dwarf_read_debug)
6070 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6072 fprintf_unfiltered (gdb_stdlog,
6073 "Psymtab for %s unit @0x%x: %s - %s"
6074 ", %d global, %d static syms\n",
6075 per_cu->is_debug_types ? "type" : "comp",
6076 per_cu->offset.sect_off,
6077 paddress (gdbarch, pst->textlow),
6078 paddress (gdbarch, pst->texthigh),
6079 pst->n_global_syms, pst->n_static_syms);
6083 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6084 Process compilation unit THIS_CU for a psymtab. */
6087 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
6088 int want_partial_unit,
6089 enum language pretend_language)
6091 struct process_psymtab_comp_unit_data info;
6093 /* If this compilation unit was already read in, free the
6094 cached copy in order to read it in again. This is
6095 necessary because we skipped some symbols when we first
6096 read in the compilation unit (see load_partial_dies).
6097 This problem could be avoided, but the benefit is unclear. */
6098 if (this_cu->cu != NULL)
6099 free_one_cached_comp_unit (this_cu);
6101 gdb_assert (! this_cu->is_debug_types);
6102 info.want_partial_unit = want_partial_unit;
6103 info.pretend_language = pretend_language;
6104 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
6105 process_psymtab_comp_unit_reader,
6108 /* Age out any secondary CUs. */
6109 age_cached_comp_units ();
6112 /* Reader function for build_type_psymtabs. */
6115 build_type_psymtabs_reader (const struct die_reader_specs *reader,
6116 const gdb_byte *info_ptr,
6117 struct die_info *type_unit_die,
6121 struct objfile *objfile = dwarf2_per_objfile->objfile;
6122 struct dwarf2_cu *cu = reader->cu;
6123 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6124 struct signatured_type *sig_type;
6125 struct type_unit_group *tu_group;
6126 struct attribute *attr;
6127 struct partial_die_info *first_die;
6128 CORE_ADDR lowpc, highpc;
6129 struct partial_symtab *pst;
6131 gdb_assert (data == NULL);
6132 gdb_assert (per_cu->is_debug_types);
6133 sig_type = (struct signatured_type *) per_cu;
6138 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
6139 tu_group = get_type_unit_group (cu, attr);
6141 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
6143 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
6144 cu->list_in_scope = &file_symbols;
6145 pst = create_partial_symtab (per_cu, "");
6148 first_die = load_partial_dies (reader, info_ptr, 1);
6150 lowpc = (CORE_ADDR) -1;
6151 highpc = (CORE_ADDR) 0;
6152 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
6154 end_psymtab_common (objfile, pst);
6157 /* Struct used to sort TUs by their abbreviation table offset. */
6159 struct tu_abbrev_offset
6161 struct signatured_type *sig_type;
6162 sect_offset abbrev_offset;
6165 /* Helper routine for build_type_psymtabs_1, passed to qsort. */
6168 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
6170 const struct tu_abbrev_offset * const *a
6171 = (const struct tu_abbrev_offset * const*) ap;
6172 const struct tu_abbrev_offset * const *b
6173 = (const struct tu_abbrev_offset * const*) bp;
6174 unsigned int aoff = (*a)->abbrev_offset.sect_off;
6175 unsigned int boff = (*b)->abbrev_offset.sect_off;
6177 return (aoff > boff) - (aoff < boff);
6180 /* Efficiently read all the type units.
6181 This does the bulk of the work for build_type_psymtabs.
6183 The efficiency is because we sort TUs by the abbrev table they use and
6184 only read each abbrev table once. In one program there are 200K TUs
6185 sharing 8K abbrev tables.
6187 The main purpose of this function is to support building the
6188 dwarf2_per_objfile->type_unit_groups table.
6189 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
6190 can collapse the search space by grouping them by stmt_list.
6191 The savings can be significant, in the same program from above the 200K TUs
6192 share 8K stmt_list tables.
6194 FUNC is expected to call get_type_unit_group, which will create the
6195 struct type_unit_group if necessary and add it to
6196 dwarf2_per_objfile->type_unit_groups. */
6199 build_type_psymtabs_1 (void)
6201 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6202 struct cleanup *cleanups;
6203 struct abbrev_table *abbrev_table;
6204 sect_offset abbrev_offset;
6205 struct tu_abbrev_offset *sorted_by_abbrev;
6208 /* It's up to the caller to not call us multiple times. */
6209 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
6211 if (dwarf2_per_objfile->n_type_units == 0)
6214 /* TUs typically share abbrev tables, and there can be way more TUs than
6215 abbrev tables. Sort by abbrev table to reduce the number of times we
6216 read each abbrev table in.
6217 Alternatives are to punt or to maintain a cache of abbrev tables.
6218 This is simpler and efficient enough for now.
6220 Later we group TUs by their DW_AT_stmt_list value (as this defines the
6221 symtab to use). Typically TUs with the same abbrev offset have the same
6222 stmt_list value too so in practice this should work well.
6224 The basic algorithm here is:
6226 sort TUs by abbrev table
6227 for each TU with same abbrev table:
6228 read abbrev table if first user
6229 read TU top level DIE
6230 [IWBN if DWO skeletons had DW_AT_stmt_list]
6233 if (dwarf_read_debug)
6234 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
6236 /* Sort in a separate table to maintain the order of all_type_units
6237 for .gdb_index: TU indices directly index all_type_units. */
6238 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
6239 dwarf2_per_objfile->n_type_units);
6240 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
6242 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
6244 sorted_by_abbrev[i].sig_type = sig_type;
6245 sorted_by_abbrev[i].abbrev_offset =
6246 read_abbrev_offset (sig_type->per_cu.section,
6247 sig_type->per_cu.offset);
6249 cleanups = make_cleanup (xfree, sorted_by_abbrev);
6250 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
6251 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
6253 abbrev_offset.sect_off = ~(unsigned) 0;
6254 abbrev_table = NULL;
6255 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
6257 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
6259 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
6261 /* Switch to the next abbrev table if necessary. */
6262 if (abbrev_table == NULL
6263 || tu->abbrev_offset.sect_off != abbrev_offset.sect_off)
6265 if (abbrev_table != NULL)
6267 abbrev_table_free (abbrev_table);
6268 /* Reset to NULL in case abbrev_table_read_table throws
6269 an error: abbrev_table_free_cleanup will get called. */
6270 abbrev_table = NULL;
6272 abbrev_offset = tu->abbrev_offset;
6274 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
6276 ++tu_stats->nr_uniq_abbrev_tables;
6279 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
6280 build_type_psymtabs_reader, NULL);
6283 do_cleanups (cleanups);
6286 /* Print collected type unit statistics. */
6289 print_tu_stats (void)
6291 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6293 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
6294 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
6295 dwarf2_per_objfile->n_type_units);
6296 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
6297 tu_stats->nr_uniq_abbrev_tables);
6298 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
6299 tu_stats->nr_symtabs);
6300 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
6301 tu_stats->nr_symtab_sharers);
6302 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
6303 tu_stats->nr_stmt_less_type_units);
6304 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
6305 tu_stats->nr_all_type_units_reallocs);
6308 /* Traversal function for build_type_psymtabs. */
6311 build_type_psymtab_dependencies (void **slot, void *info)
6313 struct objfile *objfile = dwarf2_per_objfile->objfile;
6314 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
6315 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
6316 struct partial_symtab *pst = per_cu->v.psymtab;
6317 int len = VEC_length (sig_type_ptr, tu_group->tus);
6318 struct signatured_type *iter;
6321 gdb_assert (len > 0);
6322 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
6324 pst->number_of_dependencies = len;
6326 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
6328 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
6331 gdb_assert (iter->per_cu.is_debug_types);
6332 pst->dependencies[i] = iter->per_cu.v.psymtab;
6333 iter->type_unit_group = tu_group;
6336 VEC_free (sig_type_ptr, tu_group->tus);
6341 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6342 Build partial symbol tables for the .debug_types comp-units. */
6345 build_type_psymtabs (struct objfile *objfile)
6347 if (! create_all_type_units (objfile))
6350 build_type_psymtabs_1 ();
6353 /* Traversal function for process_skeletonless_type_unit.
6354 Read a TU in a DWO file and build partial symbols for it. */
6357 process_skeletonless_type_unit (void **slot, void *info)
6359 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
6360 struct objfile *objfile = (struct objfile *) info;
6361 struct signatured_type find_entry, *entry;
6363 /* If this TU doesn't exist in the global table, add it and read it in. */
6365 if (dwarf2_per_objfile->signatured_types == NULL)
6367 dwarf2_per_objfile->signatured_types
6368 = allocate_signatured_type_table (objfile);
6371 find_entry.signature = dwo_unit->signature;
6372 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
6374 /* If we've already seen this type there's nothing to do. What's happening
6375 is we're doing our own version of comdat-folding here. */
6379 /* This does the job that create_all_type_units would have done for
6381 entry = add_type_unit (dwo_unit->signature, slot);
6382 fill_in_sig_entry_from_dwo_entry (objfile, entry, dwo_unit);
6385 /* This does the job that build_type_psymtabs_1 would have done. */
6386 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0,
6387 build_type_psymtabs_reader, NULL);
6392 /* Traversal function for process_skeletonless_type_units. */
6395 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
6397 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
6399 if (dwo_file->tus != NULL)
6401 htab_traverse_noresize (dwo_file->tus,
6402 process_skeletonless_type_unit, info);
6408 /* Scan all TUs of DWO files, verifying we've processed them.
6409 This is needed in case a TU was emitted without its skeleton.
6410 Note: This can't be done until we know what all the DWO files are. */
6413 process_skeletonless_type_units (struct objfile *objfile)
6415 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
6416 if (get_dwp_file () == NULL
6417 && dwarf2_per_objfile->dwo_files != NULL)
6419 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
6420 process_dwo_file_for_skeletonless_type_units,
6425 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
6428 psymtabs_addrmap_cleanup (void *o)
6430 struct objfile *objfile = (struct objfile *) o;
6432 objfile->psymtabs_addrmap = NULL;
6435 /* Compute the 'user' field for each psymtab in OBJFILE. */
6438 set_partial_user (struct objfile *objfile)
6442 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6444 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6445 struct partial_symtab *pst = per_cu->v.psymtab;
6451 for (j = 0; j < pst->number_of_dependencies; ++j)
6453 /* Set the 'user' field only if it is not already set. */
6454 if (pst->dependencies[j]->user == NULL)
6455 pst->dependencies[j]->user = pst;
6460 /* Build the partial symbol table by doing a quick pass through the
6461 .debug_info and .debug_abbrev sections. */
6464 dwarf2_build_psymtabs_hard (struct objfile *objfile)
6466 struct cleanup *back_to, *addrmap_cleanup;
6467 struct obstack temp_obstack;
6470 if (dwarf_read_debug)
6472 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
6473 objfile_name (objfile));
6476 dwarf2_per_objfile->reading_partial_symbols = 1;
6478 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
6480 /* Any cached compilation units will be linked by the per-objfile
6481 read_in_chain. Make sure to free them when we're done. */
6482 back_to = make_cleanup (free_cached_comp_units, NULL);
6484 build_type_psymtabs (objfile);
6486 create_all_comp_units (objfile);
6488 /* Create a temporary address map on a temporary obstack. We later
6489 copy this to the final obstack. */
6490 obstack_init (&temp_obstack);
6491 make_cleanup_obstack_free (&temp_obstack);
6492 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
6493 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
6495 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6497 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6499 process_psymtab_comp_unit (per_cu, 0, language_minimal);
6502 /* This has to wait until we read the CUs, we need the list of DWOs. */
6503 process_skeletonless_type_units (objfile);
6505 /* Now that all TUs have been processed we can fill in the dependencies. */
6506 if (dwarf2_per_objfile->type_unit_groups != NULL)
6508 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
6509 build_type_psymtab_dependencies, NULL);
6512 if (dwarf_read_debug)
6515 set_partial_user (objfile);
6517 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
6518 &objfile->objfile_obstack);
6519 discard_cleanups (addrmap_cleanup);
6521 do_cleanups (back_to);
6523 if (dwarf_read_debug)
6524 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
6525 objfile_name (objfile));
6528 /* die_reader_func for load_partial_comp_unit. */
6531 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
6532 const gdb_byte *info_ptr,
6533 struct die_info *comp_unit_die,
6537 struct dwarf2_cu *cu = reader->cu;
6539 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
6541 /* Check if comp unit has_children.
6542 If so, read the rest of the partial symbols from this comp unit.
6543 If not, there's no more debug_info for this comp unit. */
6545 load_partial_dies (reader, info_ptr, 0);
6548 /* Load the partial DIEs for a secondary CU into memory.
6549 This is also used when rereading a primary CU with load_all_dies. */
6552 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
6554 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6555 load_partial_comp_unit_reader, NULL);
6559 read_comp_units_from_section (struct objfile *objfile,
6560 struct dwarf2_section_info *section,
6561 unsigned int is_dwz,
6564 struct dwarf2_per_cu_data ***all_comp_units)
6566 const gdb_byte *info_ptr;
6567 bfd *abfd = get_section_bfd_owner (section);
6569 if (dwarf_read_debug)
6570 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
6571 get_section_name (section),
6572 get_section_file_name (section));
6574 dwarf2_read_section (objfile, section);
6576 info_ptr = section->buffer;
6578 while (info_ptr < section->buffer + section->size)
6580 unsigned int length, initial_length_size;
6581 struct dwarf2_per_cu_data *this_cu;
6584 offset.sect_off = info_ptr - section->buffer;
6586 /* Read just enough information to find out where the next
6587 compilation unit is. */
6588 length = read_initial_length (abfd, info_ptr, &initial_length_size);
6590 /* Save the compilation unit for later lookup. */
6591 this_cu = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_cu_data);
6592 memset (this_cu, 0, sizeof (*this_cu));
6593 this_cu->offset = offset;
6594 this_cu->length = length + initial_length_size;
6595 this_cu->is_dwz = is_dwz;
6596 this_cu->objfile = objfile;
6597 this_cu->section = section;
6599 if (*n_comp_units == *n_allocated)
6602 *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *,
6603 *all_comp_units, *n_allocated);
6605 (*all_comp_units)[*n_comp_units] = this_cu;
6608 info_ptr = info_ptr + this_cu->length;
6612 /* Create a list of all compilation units in OBJFILE.
6613 This is only done for -readnow and building partial symtabs. */
6616 create_all_comp_units (struct objfile *objfile)
6620 struct dwarf2_per_cu_data **all_comp_units;
6621 struct dwz_file *dwz;
6625 all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated);
6627 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
6628 &n_allocated, &n_comp_units, &all_comp_units);
6630 dwz = dwarf2_get_dwz_file ();
6632 read_comp_units_from_section (objfile, &dwz->info, 1,
6633 &n_allocated, &n_comp_units,
6636 dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack,
6637 struct dwarf2_per_cu_data *,
6639 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
6640 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6641 xfree (all_comp_units);
6642 dwarf2_per_objfile->n_comp_units = n_comp_units;
6645 /* Process all loaded DIEs for compilation unit CU, starting at
6646 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
6647 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
6648 DW_AT_ranges). See the comments of add_partial_subprogram on how
6649 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
6652 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
6653 CORE_ADDR *highpc, int set_addrmap,
6654 struct dwarf2_cu *cu)
6656 struct partial_die_info *pdi;
6658 /* Now, march along the PDI's, descending into ones which have
6659 interesting children but skipping the children of the other ones,
6660 until we reach the end of the compilation unit. */
6666 fixup_partial_die (pdi, cu);
6668 /* Anonymous namespaces or modules have no name but have interesting
6669 children, so we need to look at them. Ditto for anonymous
6672 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
6673 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
6674 || pdi->tag == DW_TAG_imported_unit)
6678 case DW_TAG_subprogram:
6679 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
6681 case DW_TAG_constant:
6682 case DW_TAG_variable:
6683 case DW_TAG_typedef:
6684 case DW_TAG_union_type:
6685 if (!pdi->is_declaration)
6687 add_partial_symbol (pdi, cu);
6690 case DW_TAG_class_type:
6691 case DW_TAG_interface_type:
6692 case DW_TAG_structure_type:
6693 if (!pdi->is_declaration)
6695 add_partial_symbol (pdi, cu);
6697 if (cu->language == language_rust && pdi->has_children)
6698 scan_partial_symbols (pdi->die_child, lowpc, highpc,
6701 case DW_TAG_enumeration_type:
6702 if (!pdi->is_declaration)
6703 add_partial_enumeration (pdi, cu);
6705 case DW_TAG_base_type:
6706 case DW_TAG_subrange_type:
6707 /* File scope base type definitions are added to the partial
6709 add_partial_symbol (pdi, cu);
6711 case DW_TAG_namespace:
6712 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
6715 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
6717 case DW_TAG_imported_unit:
6719 struct dwarf2_per_cu_data *per_cu;
6721 /* For now we don't handle imported units in type units. */
6722 if (cu->per_cu->is_debug_types)
6724 error (_("Dwarf Error: DW_TAG_imported_unit is not"
6725 " supported in type units [in module %s]"),
6726 objfile_name (cu->objfile));
6729 per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset,
6733 /* Go read the partial unit, if needed. */
6734 if (per_cu->v.psymtab == NULL)
6735 process_psymtab_comp_unit (per_cu, 1, cu->language);
6737 VEC_safe_push (dwarf2_per_cu_ptr,
6738 cu->per_cu->imported_symtabs, per_cu);
6741 case DW_TAG_imported_declaration:
6742 add_partial_symbol (pdi, cu);
6749 /* If the die has a sibling, skip to the sibling. */
6751 pdi = pdi->die_sibling;
6755 /* Functions used to compute the fully scoped name of a partial DIE.
6757 Normally, this is simple. For C++, the parent DIE's fully scoped
6758 name is concatenated with "::" and the partial DIE's name.
6759 Enumerators are an exception; they use the scope of their parent
6760 enumeration type, i.e. the name of the enumeration type is not
6761 prepended to the enumerator.
6763 There are two complexities. One is DW_AT_specification; in this
6764 case "parent" means the parent of the target of the specification,
6765 instead of the direct parent of the DIE. The other is compilers
6766 which do not emit DW_TAG_namespace; in this case we try to guess
6767 the fully qualified name of structure types from their members'
6768 linkage names. This must be done using the DIE's children rather
6769 than the children of any DW_AT_specification target. We only need
6770 to do this for structures at the top level, i.e. if the target of
6771 any DW_AT_specification (if any; otherwise the DIE itself) does not
6774 /* Compute the scope prefix associated with PDI's parent, in
6775 compilation unit CU. The result will be allocated on CU's
6776 comp_unit_obstack, or a copy of the already allocated PDI->NAME
6777 field. NULL is returned if no prefix is necessary. */
6779 partial_die_parent_scope (struct partial_die_info *pdi,
6780 struct dwarf2_cu *cu)
6782 const char *grandparent_scope;
6783 struct partial_die_info *parent, *real_pdi;
6785 /* We need to look at our parent DIE; if we have a DW_AT_specification,
6786 then this means the parent of the specification DIE. */
6789 while (real_pdi->has_specification)
6790 real_pdi = find_partial_die (real_pdi->spec_offset,
6791 real_pdi->spec_is_dwz, cu);
6793 parent = real_pdi->die_parent;
6797 if (parent->scope_set)
6798 return parent->scope;
6800 fixup_partial_die (parent, cu);
6802 grandparent_scope = partial_die_parent_scope (parent, cu);
6804 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
6805 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
6806 Work around this problem here. */
6807 if (cu->language == language_cplus
6808 && parent->tag == DW_TAG_namespace
6809 && strcmp (parent->name, "::") == 0
6810 && grandparent_scope == NULL)
6812 parent->scope = NULL;
6813 parent->scope_set = 1;
6817 if (pdi->tag == DW_TAG_enumerator)
6818 /* Enumerators should not get the name of the enumeration as a prefix. */
6819 parent->scope = grandparent_scope;
6820 else if (parent->tag == DW_TAG_namespace
6821 || parent->tag == DW_TAG_module
6822 || parent->tag == DW_TAG_structure_type
6823 || parent->tag == DW_TAG_class_type
6824 || parent->tag == DW_TAG_interface_type
6825 || parent->tag == DW_TAG_union_type
6826 || parent->tag == DW_TAG_enumeration_type)
6828 if (grandparent_scope == NULL)
6829 parent->scope = parent->name;
6831 parent->scope = typename_concat (&cu->comp_unit_obstack,
6833 parent->name, 0, cu);
6837 /* FIXME drow/2004-04-01: What should we be doing with
6838 function-local names? For partial symbols, we should probably be
6840 complaint (&symfile_complaints,
6841 _("unhandled containing DIE tag %d for DIE at %d"),
6842 parent->tag, pdi->offset.sect_off);
6843 parent->scope = grandparent_scope;
6846 parent->scope_set = 1;
6847 return parent->scope;
6850 /* Return the fully scoped name associated with PDI, from compilation unit
6851 CU. The result will be allocated with malloc. */
6854 partial_die_full_name (struct partial_die_info *pdi,
6855 struct dwarf2_cu *cu)
6857 const char *parent_scope;
6859 /* If this is a template instantiation, we can not work out the
6860 template arguments from partial DIEs. So, unfortunately, we have
6861 to go through the full DIEs. At least any work we do building
6862 types here will be reused if full symbols are loaded later. */
6863 if (pdi->has_template_arguments)
6865 fixup_partial_die (pdi, cu);
6867 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
6869 struct die_info *die;
6870 struct attribute attr;
6871 struct dwarf2_cu *ref_cu = cu;
6873 /* DW_FORM_ref_addr is using section offset. */
6874 attr.name = (enum dwarf_attribute) 0;
6875 attr.form = DW_FORM_ref_addr;
6876 attr.u.unsnd = pdi->offset.sect_off;
6877 die = follow_die_ref (NULL, &attr, &ref_cu);
6879 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
6883 parent_scope = partial_die_parent_scope (pdi, cu);
6884 if (parent_scope == NULL)
6887 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
6891 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
6893 struct objfile *objfile = cu->objfile;
6894 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6896 const char *actual_name = NULL;
6898 char *built_actual_name;
6900 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6902 built_actual_name = partial_die_full_name (pdi, cu);
6903 if (built_actual_name != NULL)
6904 actual_name = built_actual_name;
6906 if (actual_name == NULL)
6907 actual_name = pdi->name;
6911 case DW_TAG_subprogram:
6912 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
6913 if (pdi->is_external || cu->language == language_ada)
6915 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
6916 of the global scope. But in Ada, we want to be able to access
6917 nested procedures globally. So all Ada subprograms are stored
6918 in the global scope. */
6919 add_psymbol_to_list (actual_name, strlen (actual_name),
6920 built_actual_name != NULL,
6921 VAR_DOMAIN, LOC_BLOCK,
6922 &objfile->global_psymbols,
6923 addr, cu->language, objfile);
6927 add_psymbol_to_list (actual_name, strlen (actual_name),
6928 built_actual_name != NULL,
6929 VAR_DOMAIN, LOC_BLOCK,
6930 &objfile->static_psymbols,
6931 addr, cu->language, objfile);
6934 case DW_TAG_constant:
6936 struct psymbol_allocation_list *list;
6938 if (pdi->is_external)
6939 list = &objfile->global_psymbols;
6941 list = &objfile->static_psymbols;
6942 add_psymbol_to_list (actual_name, strlen (actual_name),
6943 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
6944 list, 0, cu->language, objfile);
6947 case DW_TAG_variable:
6949 addr = decode_locdesc (pdi->d.locdesc, cu);
6953 && !dwarf2_per_objfile->has_section_at_zero)
6955 /* A global or static variable may also have been stripped
6956 out by the linker if unused, in which case its address
6957 will be nullified; do not add such variables into partial
6958 symbol table then. */
6960 else if (pdi->is_external)
6963 Don't enter into the minimal symbol tables as there is
6964 a minimal symbol table entry from the ELF symbols already.
6965 Enter into partial symbol table if it has a location
6966 descriptor or a type.
6967 If the location descriptor is missing, new_symbol will create
6968 a LOC_UNRESOLVED symbol, the address of the variable will then
6969 be determined from the minimal symbol table whenever the variable
6971 The address for the partial symbol table entry is not
6972 used by GDB, but it comes in handy for debugging partial symbol
6975 if (pdi->d.locdesc || pdi->has_type)
6976 add_psymbol_to_list (actual_name, strlen (actual_name),
6977 built_actual_name != NULL,
6978 VAR_DOMAIN, LOC_STATIC,
6979 &objfile->global_psymbols,
6981 cu->language, objfile);
6985 int has_loc = pdi->d.locdesc != NULL;
6987 /* Static Variable. Skip symbols whose value we cannot know (those
6988 without location descriptors or constant values). */
6989 if (!has_loc && !pdi->has_const_value)
6991 xfree (built_actual_name);
6995 add_psymbol_to_list (actual_name, strlen (actual_name),
6996 built_actual_name != NULL,
6997 VAR_DOMAIN, LOC_STATIC,
6998 &objfile->static_psymbols,
6999 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
7000 cu->language, objfile);
7003 case DW_TAG_typedef:
7004 case DW_TAG_base_type:
7005 case DW_TAG_subrange_type:
7006 add_psymbol_to_list (actual_name, strlen (actual_name),
7007 built_actual_name != NULL,
7008 VAR_DOMAIN, LOC_TYPEDEF,
7009 &objfile->static_psymbols,
7010 0, cu->language, objfile);
7012 case DW_TAG_imported_declaration:
7013 case DW_TAG_namespace:
7014 add_psymbol_to_list (actual_name, strlen (actual_name),
7015 built_actual_name != NULL,
7016 VAR_DOMAIN, LOC_TYPEDEF,
7017 &objfile->global_psymbols,
7018 0, cu->language, objfile);
7021 add_psymbol_to_list (actual_name, strlen (actual_name),
7022 built_actual_name != NULL,
7023 MODULE_DOMAIN, LOC_TYPEDEF,
7024 &objfile->global_psymbols,
7025 0, cu->language, objfile);
7027 case DW_TAG_class_type:
7028 case DW_TAG_interface_type:
7029 case DW_TAG_structure_type:
7030 case DW_TAG_union_type:
7031 case DW_TAG_enumeration_type:
7032 /* Skip external references. The DWARF standard says in the section
7033 about "Structure, Union, and Class Type Entries": "An incomplete
7034 structure, union or class type is represented by a structure,
7035 union or class entry that does not have a byte size attribute
7036 and that has a DW_AT_declaration attribute." */
7037 if (!pdi->has_byte_size && pdi->is_declaration)
7039 xfree (built_actual_name);
7043 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
7044 static vs. global. */
7045 add_psymbol_to_list (actual_name, strlen (actual_name),
7046 built_actual_name != NULL,
7047 STRUCT_DOMAIN, LOC_TYPEDEF,
7048 cu->language == language_cplus
7049 ? &objfile->global_psymbols
7050 : &objfile->static_psymbols,
7051 0, cu->language, objfile);
7054 case DW_TAG_enumerator:
7055 add_psymbol_to_list (actual_name, strlen (actual_name),
7056 built_actual_name != NULL,
7057 VAR_DOMAIN, LOC_CONST,
7058 cu->language == language_cplus
7059 ? &objfile->global_psymbols
7060 : &objfile->static_psymbols,
7061 0, cu->language, objfile);
7067 xfree (built_actual_name);
7070 /* Read a partial die corresponding to a namespace; also, add a symbol
7071 corresponding to that namespace to the symbol table. NAMESPACE is
7072 the name of the enclosing namespace. */
7075 add_partial_namespace (struct partial_die_info *pdi,
7076 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7077 int set_addrmap, struct dwarf2_cu *cu)
7079 /* Add a symbol for the namespace. */
7081 add_partial_symbol (pdi, cu);
7083 /* Now scan partial symbols in that namespace. */
7085 if (pdi->has_children)
7086 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7089 /* Read a partial die corresponding to a Fortran module. */
7092 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
7093 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
7095 /* Add a symbol for the namespace. */
7097 add_partial_symbol (pdi, cu);
7099 /* Now scan partial symbols in that module. */
7101 if (pdi->has_children)
7102 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7105 /* Read a partial die corresponding to a subprogram and create a partial
7106 symbol for that subprogram. When the CU language allows it, this
7107 routine also defines a partial symbol for each nested subprogram
7108 that this subprogram contains. If SET_ADDRMAP is true, record the
7109 covered ranges in the addrmap. Set *LOWPC and *HIGHPC to the lowest
7110 and highest PC values found in PDI.
7112 PDI may also be a lexical block, in which case we simply search
7113 recursively for subprograms defined inside that lexical block.
7114 Again, this is only performed when the CU language allows this
7115 type of definitions. */
7118 add_partial_subprogram (struct partial_die_info *pdi,
7119 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7120 int set_addrmap, struct dwarf2_cu *cu)
7122 if (pdi->tag == DW_TAG_subprogram)
7124 if (pdi->has_pc_info)
7126 if (pdi->lowpc < *lowpc)
7127 *lowpc = pdi->lowpc;
7128 if (pdi->highpc > *highpc)
7129 *highpc = pdi->highpc;
7132 struct objfile *objfile = cu->objfile;
7133 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7138 baseaddr = ANOFFSET (objfile->section_offsets,
7139 SECT_OFF_TEXT (objfile));
7140 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7141 pdi->lowpc + baseaddr);
7142 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7143 pdi->highpc + baseaddr);
7144 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
7145 cu->per_cu->v.psymtab);
7149 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
7151 if (!pdi->is_declaration)
7152 /* Ignore subprogram DIEs that do not have a name, they are
7153 illegal. Do not emit a complaint at this point, we will
7154 do so when we convert this psymtab into a symtab. */
7156 add_partial_symbol (pdi, cu);
7160 if (! pdi->has_children)
7163 if (cu->language == language_ada)
7165 pdi = pdi->die_child;
7168 fixup_partial_die (pdi, cu);
7169 if (pdi->tag == DW_TAG_subprogram
7170 || pdi->tag == DW_TAG_lexical_block)
7171 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
7172 pdi = pdi->die_sibling;
7177 /* Read a partial die corresponding to an enumeration type. */
7180 add_partial_enumeration (struct partial_die_info *enum_pdi,
7181 struct dwarf2_cu *cu)
7183 struct partial_die_info *pdi;
7185 if (enum_pdi->name != NULL)
7186 add_partial_symbol (enum_pdi, cu);
7188 pdi = enum_pdi->die_child;
7191 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
7192 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
7194 add_partial_symbol (pdi, cu);
7195 pdi = pdi->die_sibling;
7199 /* Return the initial uleb128 in the die at INFO_PTR. */
7202 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
7204 unsigned int bytes_read;
7206 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7209 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
7210 Return the corresponding abbrev, or NULL if the number is zero (indicating
7211 an empty DIE). In either case *BYTES_READ will be set to the length of
7212 the initial number. */
7214 static struct abbrev_info *
7215 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
7216 struct dwarf2_cu *cu)
7218 bfd *abfd = cu->objfile->obfd;
7219 unsigned int abbrev_number;
7220 struct abbrev_info *abbrev;
7222 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
7224 if (abbrev_number == 0)
7227 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
7230 error (_("Dwarf Error: Could not find abbrev number %d in %s"
7231 " at offset 0x%x [in module %s]"),
7232 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
7233 cu->header.offset.sect_off, bfd_get_filename (abfd));
7239 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7240 Returns a pointer to the end of a series of DIEs, terminated by an empty
7241 DIE. Any children of the skipped DIEs will also be skipped. */
7243 static const gdb_byte *
7244 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
7246 struct dwarf2_cu *cu = reader->cu;
7247 struct abbrev_info *abbrev;
7248 unsigned int bytes_read;
7252 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
7254 return info_ptr + bytes_read;
7256 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
7260 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7261 INFO_PTR should point just after the initial uleb128 of a DIE, and the
7262 abbrev corresponding to that skipped uleb128 should be passed in
7263 ABBREV. Returns a pointer to this DIE's sibling, skipping any
7266 static const gdb_byte *
7267 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
7268 struct abbrev_info *abbrev)
7270 unsigned int bytes_read;
7271 struct attribute attr;
7272 bfd *abfd = reader->abfd;
7273 struct dwarf2_cu *cu = reader->cu;
7274 const gdb_byte *buffer = reader->buffer;
7275 const gdb_byte *buffer_end = reader->buffer_end;
7276 unsigned int form, i;
7278 for (i = 0; i < abbrev->num_attrs; i++)
7280 /* The only abbrev we care about is DW_AT_sibling. */
7281 if (abbrev->attrs[i].name == DW_AT_sibling)
7283 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
7284 if (attr.form == DW_FORM_ref_addr)
7285 complaint (&symfile_complaints,
7286 _("ignoring absolute DW_AT_sibling"));
7289 unsigned int off = dwarf2_get_ref_die_offset (&attr).sect_off;
7290 const gdb_byte *sibling_ptr = buffer + off;
7292 if (sibling_ptr < info_ptr)
7293 complaint (&symfile_complaints,
7294 _("DW_AT_sibling points backwards"));
7295 else if (sibling_ptr > reader->buffer_end)
7296 dwarf2_section_buffer_overflow_complaint (reader->die_section);
7302 /* If it isn't DW_AT_sibling, skip this attribute. */
7303 form = abbrev->attrs[i].form;
7307 case DW_FORM_ref_addr:
7308 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
7309 and later it is offset sized. */
7310 if (cu->header.version == 2)
7311 info_ptr += cu->header.addr_size;
7313 info_ptr += cu->header.offset_size;
7315 case DW_FORM_GNU_ref_alt:
7316 info_ptr += cu->header.offset_size;
7319 info_ptr += cu->header.addr_size;
7326 case DW_FORM_flag_present:
7338 case DW_FORM_ref_sig8:
7341 case DW_FORM_string:
7342 read_direct_string (abfd, info_ptr, &bytes_read);
7343 info_ptr += bytes_read;
7345 case DW_FORM_sec_offset:
7347 case DW_FORM_GNU_strp_alt:
7348 info_ptr += cu->header.offset_size;
7350 case DW_FORM_exprloc:
7352 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7353 info_ptr += bytes_read;
7355 case DW_FORM_block1:
7356 info_ptr += 1 + read_1_byte (abfd, info_ptr);
7358 case DW_FORM_block2:
7359 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
7361 case DW_FORM_block4:
7362 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
7366 case DW_FORM_ref_udata:
7367 case DW_FORM_GNU_addr_index:
7368 case DW_FORM_GNU_str_index:
7369 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
7371 case DW_FORM_indirect:
7372 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7373 info_ptr += bytes_read;
7374 /* We need to continue parsing from here, so just go back to
7376 goto skip_attribute;
7379 error (_("Dwarf Error: Cannot handle %s "
7380 "in DWARF reader [in module %s]"),
7381 dwarf_form_name (form),
7382 bfd_get_filename (abfd));
7386 if (abbrev->has_children)
7387 return skip_children (reader, info_ptr);
7392 /* Locate ORIG_PDI's sibling.
7393 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
7395 static const gdb_byte *
7396 locate_pdi_sibling (const struct die_reader_specs *reader,
7397 struct partial_die_info *orig_pdi,
7398 const gdb_byte *info_ptr)
7400 /* Do we know the sibling already? */
7402 if (orig_pdi->sibling)
7403 return orig_pdi->sibling;
7405 /* Are there any children to deal with? */
7407 if (!orig_pdi->has_children)
7410 /* Skip the children the long way. */
7412 return skip_children (reader, info_ptr);
7415 /* Expand this partial symbol table into a full symbol table. SELF is
7419 dwarf2_read_symtab (struct partial_symtab *self,
7420 struct objfile *objfile)
7424 warning (_("bug: psymtab for %s is already read in."),
7431 printf_filtered (_("Reading in symbols for %s..."),
7433 gdb_flush (gdb_stdout);
7436 /* Restore our global data. */
7438 = (struct dwarf2_per_objfile *) objfile_data (objfile,
7439 dwarf2_objfile_data_key);
7441 /* If this psymtab is constructed from a debug-only objfile, the
7442 has_section_at_zero flag will not necessarily be correct. We
7443 can get the correct value for this flag by looking at the data
7444 associated with the (presumably stripped) associated objfile. */
7445 if (objfile->separate_debug_objfile_backlink)
7447 struct dwarf2_per_objfile *dpo_backlink
7448 = ((struct dwarf2_per_objfile *)
7449 objfile_data (objfile->separate_debug_objfile_backlink,
7450 dwarf2_objfile_data_key));
7452 dwarf2_per_objfile->has_section_at_zero
7453 = dpo_backlink->has_section_at_zero;
7456 dwarf2_per_objfile->reading_partial_symbols = 0;
7458 psymtab_to_symtab_1 (self);
7460 /* Finish up the debug error message. */
7462 printf_filtered (_("done.\n"));
7465 process_cu_includes ();
7468 /* Reading in full CUs. */
7470 /* Add PER_CU to the queue. */
7473 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
7474 enum language pretend_language)
7476 struct dwarf2_queue_item *item;
7479 item = XNEW (struct dwarf2_queue_item);
7480 item->per_cu = per_cu;
7481 item->pretend_language = pretend_language;
7484 if (dwarf2_queue == NULL)
7485 dwarf2_queue = item;
7487 dwarf2_queue_tail->next = item;
7489 dwarf2_queue_tail = item;
7492 /* If PER_CU is not yet queued, add it to the queue.
7493 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
7495 The result is non-zero if PER_CU was queued, otherwise the result is zero
7496 meaning either PER_CU is already queued or it is already loaded.
7498 N.B. There is an invariant here that if a CU is queued then it is loaded.
7499 The caller is required to load PER_CU if we return non-zero. */
7502 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
7503 struct dwarf2_per_cu_data *per_cu,
7504 enum language pretend_language)
7506 /* We may arrive here during partial symbol reading, if we need full
7507 DIEs to process an unusual case (e.g. template arguments). Do
7508 not queue PER_CU, just tell our caller to load its DIEs. */
7509 if (dwarf2_per_objfile->reading_partial_symbols)
7511 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
7516 /* Mark the dependence relation so that we don't flush PER_CU
7518 if (dependent_cu != NULL)
7519 dwarf2_add_dependence (dependent_cu, per_cu);
7521 /* If it's already on the queue, we have nothing to do. */
7525 /* If the compilation unit is already loaded, just mark it as
7527 if (per_cu->cu != NULL)
7529 per_cu->cu->last_used = 0;
7533 /* Add it to the queue. */
7534 queue_comp_unit (per_cu, pretend_language);
7539 /* Process the queue. */
7542 process_queue (void)
7544 struct dwarf2_queue_item *item, *next_item;
7546 if (dwarf_read_debug)
7548 fprintf_unfiltered (gdb_stdlog,
7549 "Expanding one or more symtabs of objfile %s ...\n",
7550 objfile_name (dwarf2_per_objfile->objfile));
7553 /* The queue starts out with one item, but following a DIE reference
7554 may load a new CU, adding it to the end of the queue. */
7555 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
7557 if ((dwarf2_per_objfile->using_index
7558 ? !item->per_cu->v.quick->compunit_symtab
7559 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
7560 /* Skip dummy CUs. */
7561 && item->per_cu->cu != NULL)
7563 struct dwarf2_per_cu_data *per_cu = item->per_cu;
7564 unsigned int debug_print_threshold;
7567 if (per_cu->is_debug_types)
7569 struct signatured_type *sig_type =
7570 (struct signatured_type *) per_cu;
7572 sprintf (buf, "TU %s at offset 0x%x",
7573 hex_string (sig_type->signature),
7574 per_cu->offset.sect_off);
7575 /* There can be 100s of TUs.
7576 Only print them in verbose mode. */
7577 debug_print_threshold = 2;
7581 sprintf (buf, "CU at offset 0x%x", per_cu->offset.sect_off);
7582 debug_print_threshold = 1;
7585 if (dwarf_read_debug >= debug_print_threshold)
7586 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
7588 if (per_cu->is_debug_types)
7589 process_full_type_unit (per_cu, item->pretend_language);
7591 process_full_comp_unit (per_cu, item->pretend_language);
7593 if (dwarf_read_debug >= debug_print_threshold)
7594 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
7597 item->per_cu->queued = 0;
7598 next_item = item->next;
7602 dwarf2_queue_tail = NULL;
7604 if (dwarf_read_debug)
7606 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7607 objfile_name (dwarf2_per_objfile->objfile));
7611 /* Free all allocated queue entries. This function only releases anything if
7612 an error was thrown; if the queue was processed then it would have been
7613 freed as we went along. */
7616 dwarf2_release_queue (void *dummy)
7618 struct dwarf2_queue_item *item, *last;
7620 item = dwarf2_queue;
7623 /* Anything still marked queued is likely to be in an
7624 inconsistent state, so discard it. */
7625 if (item->per_cu->queued)
7627 if (item->per_cu->cu != NULL)
7628 free_one_cached_comp_unit (item->per_cu);
7629 item->per_cu->queued = 0;
7637 dwarf2_queue = dwarf2_queue_tail = NULL;
7640 /* Read in full symbols for PST, and anything it depends on. */
7643 psymtab_to_symtab_1 (struct partial_symtab *pst)
7645 struct dwarf2_per_cu_data *per_cu;
7651 for (i = 0; i < pst->number_of_dependencies; i++)
7652 if (!pst->dependencies[i]->readin
7653 && pst->dependencies[i]->user == NULL)
7655 /* Inform about additional files that need to be read in. */
7658 /* FIXME: i18n: Need to make this a single string. */
7659 fputs_filtered (" ", gdb_stdout);
7661 fputs_filtered ("and ", gdb_stdout);
7663 printf_filtered ("%s...", pst->dependencies[i]->filename);
7664 wrap_here (""); /* Flush output. */
7665 gdb_flush (gdb_stdout);
7667 psymtab_to_symtab_1 (pst->dependencies[i]);
7670 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
7674 /* It's an include file, no symbols to read for it.
7675 Everything is in the parent symtab. */
7680 dw2_do_instantiate_symtab (per_cu);
7683 /* Trivial hash function for die_info: the hash value of a DIE
7684 is its offset in .debug_info for this objfile. */
7687 die_hash (const void *item)
7689 const struct die_info *die = (const struct die_info *) item;
7691 return die->offset.sect_off;
7694 /* Trivial comparison function for die_info structures: two DIEs
7695 are equal if they have the same offset. */
7698 die_eq (const void *item_lhs, const void *item_rhs)
7700 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
7701 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
7703 return die_lhs->offset.sect_off == die_rhs->offset.sect_off;
7706 /* die_reader_func for load_full_comp_unit.
7707 This is identical to read_signatured_type_reader,
7708 but is kept separate for now. */
7711 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7712 const gdb_byte *info_ptr,
7713 struct die_info *comp_unit_die,
7717 struct dwarf2_cu *cu = reader->cu;
7718 enum language *language_ptr = (enum language *) data;
7720 gdb_assert (cu->die_hash == NULL);
7722 htab_create_alloc_ex (cu->header.length / 12,
7726 &cu->comp_unit_obstack,
7727 hashtab_obstack_allocate,
7728 dummy_obstack_deallocate);
7731 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7732 &info_ptr, comp_unit_die);
7733 cu->dies = comp_unit_die;
7734 /* comp_unit_die is not stored in die_hash, no need. */
7736 /* We try not to read any attributes in this function, because not
7737 all CUs needed for references have been loaded yet, and symbol
7738 table processing isn't initialized. But we have to set the CU language,
7739 or we won't be able to build types correctly.
7740 Similarly, if we do not read the producer, we can not apply
7741 producer-specific interpretation. */
7742 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
7745 /* Load the DIEs associated with PER_CU into memory. */
7748 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
7749 enum language pretend_language)
7751 gdb_assert (! this_cu->is_debug_types);
7753 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7754 load_full_comp_unit_reader, &pretend_language);
7757 /* Add a DIE to the delayed physname list. */
7760 add_to_method_list (struct type *type, int fnfield_index, int index,
7761 const char *name, struct die_info *die,
7762 struct dwarf2_cu *cu)
7764 struct delayed_method_info mi;
7766 mi.fnfield_index = fnfield_index;
7770 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
7773 /* A cleanup for freeing the delayed method list. */
7776 free_delayed_list (void *ptr)
7778 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
7779 if (cu->method_list != NULL)
7781 VEC_free (delayed_method_info, cu->method_list);
7782 cu->method_list = NULL;
7786 /* Compute the physnames of any methods on the CU's method list.
7788 The computation of method physnames is delayed in order to avoid the
7789 (bad) condition that one of the method's formal parameters is of an as yet
7793 compute_delayed_physnames (struct dwarf2_cu *cu)
7796 struct delayed_method_info *mi;
7797 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
7799 const char *physname;
7800 struct fn_fieldlist *fn_flp
7801 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
7802 physname = dwarf2_physname (mi->name, mi->die, cu);
7803 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi->index)
7804 = physname ? physname : "";
7808 /* Go objects should be embedded in a DW_TAG_module DIE,
7809 and it's not clear if/how imported objects will appear.
7810 To keep Go support simple until that's worked out,
7811 go back through what we've read and create something usable.
7812 We could do this while processing each DIE, and feels kinda cleaner,
7813 but that way is more invasive.
7814 This is to, for example, allow the user to type "p var" or "b main"
7815 without having to specify the package name, and allow lookups
7816 of module.object to work in contexts that use the expression
7820 fixup_go_packaging (struct dwarf2_cu *cu)
7822 char *package_name = NULL;
7823 struct pending *list;
7826 for (list = global_symbols; list != NULL; list = list->next)
7828 for (i = 0; i < list->nsyms; ++i)
7830 struct symbol *sym = list->symbol[i];
7832 if (SYMBOL_LANGUAGE (sym) == language_go
7833 && SYMBOL_CLASS (sym) == LOC_BLOCK)
7835 char *this_package_name = go_symbol_package_name (sym);
7837 if (this_package_name == NULL)
7839 if (package_name == NULL)
7840 package_name = this_package_name;
7843 if (strcmp (package_name, this_package_name) != 0)
7844 complaint (&symfile_complaints,
7845 _("Symtab %s has objects from two different Go packages: %s and %s"),
7846 (symbol_symtab (sym) != NULL
7847 ? symtab_to_filename_for_display
7848 (symbol_symtab (sym))
7849 : objfile_name (cu->objfile)),
7850 this_package_name, package_name);
7851 xfree (this_package_name);
7857 if (package_name != NULL)
7859 struct objfile *objfile = cu->objfile;
7860 const char *saved_package_name
7861 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
7863 strlen (package_name));
7864 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
7865 saved_package_name);
7868 TYPE_TAG_NAME (type) = TYPE_NAME (type);
7870 sym = allocate_symbol (objfile);
7871 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
7872 SYMBOL_SET_NAMES (sym, saved_package_name,
7873 strlen (saved_package_name), 0, objfile);
7874 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
7875 e.g., "main" finds the "main" module and not C's main(). */
7876 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
7877 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
7878 SYMBOL_TYPE (sym) = type;
7880 add_symbol_to_list (sym, &global_symbols);
7882 xfree (package_name);
7886 /* Return the symtab for PER_CU. This works properly regardless of
7887 whether we're using the index or psymtabs. */
7889 static struct compunit_symtab *
7890 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
7892 return (dwarf2_per_objfile->using_index
7893 ? per_cu->v.quick->compunit_symtab
7894 : per_cu->v.psymtab->compunit_symtab);
7897 /* A helper function for computing the list of all symbol tables
7898 included by PER_CU. */
7901 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
7902 htab_t all_children, htab_t all_type_symtabs,
7903 struct dwarf2_per_cu_data *per_cu,
7904 struct compunit_symtab *immediate_parent)
7908 struct compunit_symtab *cust;
7909 struct dwarf2_per_cu_data *iter;
7911 slot = htab_find_slot (all_children, per_cu, INSERT);
7914 /* This inclusion and its children have been processed. */
7919 /* Only add a CU if it has a symbol table. */
7920 cust = get_compunit_symtab (per_cu);
7923 /* If this is a type unit only add its symbol table if we haven't
7924 seen it yet (type unit per_cu's can share symtabs). */
7925 if (per_cu->is_debug_types)
7927 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
7931 VEC_safe_push (compunit_symtab_ptr, *result, cust);
7932 if (cust->user == NULL)
7933 cust->user = immediate_parent;
7938 VEC_safe_push (compunit_symtab_ptr, *result, cust);
7939 if (cust->user == NULL)
7940 cust->user = immediate_parent;
7945 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
7948 recursively_compute_inclusions (result, all_children,
7949 all_type_symtabs, iter, cust);
7953 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
7957 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
7959 gdb_assert (! per_cu->is_debug_types);
7961 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
7964 struct dwarf2_per_cu_data *per_cu_iter;
7965 struct compunit_symtab *compunit_symtab_iter;
7966 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
7967 htab_t all_children, all_type_symtabs;
7968 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
7970 /* If we don't have a symtab, we can just skip this case. */
7974 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7975 NULL, xcalloc, xfree);
7976 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7977 NULL, xcalloc, xfree);
7980 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
7984 recursively_compute_inclusions (&result_symtabs, all_children,
7985 all_type_symtabs, per_cu_iter,
7989 /* Now we have a transitive closure of all the included symtabs. */
7990 len = VEC_length (compunit_symtab_ptr, result_symtabs);
7992 = XOBNEWVEC (&dwarf2_per_objfile->objfile->objfile_obstack,
7993 struct compunit_symtab *, len + 1);
7995 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
7996 compunit_symtab_iter);
7998 cust->includes[ix] = compunit_symtab_iter;
7999 cust->includes[len] = NULL;
8001 VEC_free (compunit_symtab_ptr, result_symtabs);
8002 htab_delete (all_children);
8003 htab_delete (all_type_symtabs);
8007 /* Compute the 'includes' field for the symtabs of all the CUs we just
8011 process_cu_includes (void)
8014 struct dwarf2_per_cu_data *iter;
8017 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
8021 if (! iter->is_debug_types)
8022 compute_compunit_symtab_includes (iter);
8025 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
8028 /* Generate full symbol information for PER_CU, whose DIEs have
8029 already been loaded into memory. */
8032 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
8033 enum language pretend_language)
8035 struct dwarf2_cu *cu = per_cu->cu;
8036 struct objfile *objfile = per_cu->objfile;
8037 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8038 CORE_ADDR lowpc, highpc;
8039 struct compunit_symtab *cust;
8040 struct cleanup *back_to, *delayed_list_cleanup;
8042 struct block *static_block;
8045 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8048 back_to = make_cleanup (really_free_pendings, NULL);
8049 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
8051 cu->list_in_scope = &file_symbols;
8053 cu->language = pretend_language;
8054 cu->language_defn = language_def (cu->language);
8056 /* Do line number decoding in read_file_scope () */
8057 process_die (cu->dies, cu);
8059 /* For now fudge the Go package. */
8060 if (cu->language == language_go)
8061 fixup_go_packaging (cu);
8063 /* Now that we have processed all the DIEs in the CU, all the types
8064 should be complete, and it should now be safe to compute all of the
8066 compute_delayed_physnames (cu);
8067 do_cleanups (delayed_list_cleanup);
8069 /* Some compilers don't define a DW_AT_high_pc attribute for the
8070 compilation unit. If the DW_AT_high_pc is missing, synthesize
8071 it, by scanning the DIE's below the compilation unit. */
8072 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
8074 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
8075 static_block = end_symtab_get_static_block (addr, 0, 1);
8077 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
8078 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
8079 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
8080 addrmap to help ensure it has an accurate map of pc values belonging to
8082 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
8084 cust = end_symtab_from_static_block (static_block,
8085 SECT_OFF_TEXT (objfile), 0);
8089 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
8091 /* Set symtab language to language from DW_AT_language. If the
8092 compilation is from a C file generated by language preprocessors, do
8093 not set the language if it was already deduced by start_subfile. */
8094 if (!(cu->language == language_c
8095 && COMPUNIT_FILETABS (cust)->language != language_unknown))
8096 COMPUNIT_FILETABS (cust)->language = cu->language;
8098 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
8099 produce DW_AT_location with location lists but it can be possibly
8100 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
8101 there were bugs in prologue debug info, fixed later in GCC-4.5
8102 by "unwind info for epilogues" patch (which is not directly related).
8104 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
8105 needed, it would be wrong due to missing DW_AT_producer there.
8107 Still one can confuse GDB by using non-standard GCC compilation
8108 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
8110 if (cu->has_loclist && gcc_4_minor >= 5)
8111 cust->locations_valid = 1;
8113 if (gcc_4_minor >= 5)
8114 cust->epilogue_unwind_valid = 1;
8116 cust->call_site_htab = cu->call_site_htab;
8119 if (dwarf2_per_objfile->using_index)
8120 per_cu->v.quick->compunit_symtab = cust;
8123 struct partial_symtab *pst = per_cu->v.psymtab;
8124 pst->compunit_symtab = cust;
8128 /* Push it for inclusion processing later. */
8129 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
8131 do_cleanups (back_to);
8134 /* Generate full symbol information for type unit PER_CU, whose DIEs have
8135 already been loaded into memory. */
8138 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
8139 enum language pretend_language)
8141 struct dwarf2_cu *cu = per_cu->cu;
8142 struct objfile *objfile = per_cu->objfile;
8143 struct compunit_symtab *cust;
8144 struct cleanup *back_to, *delayed_list_cleanup;
8145 struct signatured_type *sig_type;
8147 gdb_assert (per_cu->is_debug_types);
8148 sig_type = (struct signatured_type *) per_cu;
8151 back_to = make_cleanup (really_free_pendings, NULL);
8152 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
8154 cu->list_in_scope = &file_symbols;
8156 cu->language = pretend_language;
8157 cu->language_defn = language_def (cu->language);
8159 /* The symbol tables are set up in read_type_unit_scope. */
8160 process_die (cu->dies, cu);
8162 /* For now fudge the Go package. */
8163 if (cu->language == language_go)
8164 fixup_go_packaging (cu);
8166 /* Now that we have processed all the DIEs in the CU, all the types
8167 should be complete, and it should now be safe to compute all of the
8169 compute_delayed_physnames (cu);
8170 do_cleanups (delayed_list_cleanup);
8172 /* TUs share symbol tables.
8173 If this is the first TU to use this symtab, complete the construction
8174 of it with end_expandable_symtab. Otherwise, complete the addition of
8175 this TU's symbols to the existing symtab. */
8176 if (sig_type->type_unit_group->compunit_symtab == NULL)
8178 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
8179 sig_type->type_unit_group->compunit_symtab = cust;
8183 /* Set symtab language to language from DW_AT_language. If the
8184 compilation is from a C file generated by language preprocessors,
8185 do not set the language if it was already deduced by
8187 if (!(cu->language == language_c
8188 && COMPUNIT_FILETABS (cust)->language != language_c))
8189 COMPUNIT_FILETABS (cust)->language = cu->language;
8194 augment_type_symtab ();
8195 cust = sig_type->type_unit_group->compunit_symtab;
8198 if (dwarf2_per_objfile->using_index)
8199 per_cu->v.quick->compunit_symtab = cust;
8202 struct partial_symtab *pst = per_cu->v.psymtab;
8203 pst->compunit_symtab = cust;
8207 do_cleanups (back_to);
8210 /* Process an imported unit DIE. */
8213 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
8215 struct attribute *attr;
8217 /* For now we don't handle imported units in type units. */
8218 if (cu->per_cu->is_debug_types)
8220 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8221 " supported in type units [in module %s]"),
8222 objfile_name (cu->objfile));
8225 attr = dwarf2_attr (die, DW_AT_import, cu);
8228 struct dwarf2_per_cu_data *per_cu;
8232 offset = dwarf2_get_ref_die_offset (attr);
8233 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
8234 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile);
8236 /* If necessary, add it to the queue and load its DIEs. */
8237 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
8238 load_full_comp_unit (per_cu, cu->language);
8240 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8245 /* Reset the in_process bit of a die. */
8248 reset_die_in_process (void *arg)
8250 struct die_info *die = (struct die_info *) arg;
8252 die->in_process = 0;
8255 /* Process a die and its children. */
8258 process_die (struct die_info *die, struct dwarf2_cu *cu)
8260 struct cleanup *in_process;
8262 /* We should only be processing those not already in process. */
8263 gdb_assert (!die->in_process);
8265 die->in_process = 1;
8266 in_process = make_cleanup (reset_die_in_process,die);
8270 case DW_TAG_padding:
8272 case DW_TAG_compile_unit:
8273 case DW_TAG_partial_unit:
8274 read_file_scope (die, cu);
8276 case DW_TAG_type_unit:
8277 read_type_unit_scope (die, cu);
8279 case DW_TAG_subprogram:
8280 case DW_TAG_inlined_subroutine:
8281 read_func_scope (die, cu);
8283 case DW_TAG_lexical_block:
8284 case DW_TAG_try_block:
8285 case DW_TAG_catch_block:
8286 read_lexical_block_scope (die, cu);
8288 case DW_TAG_GNU_call_site:
8289 read_call_site_scope (die, cu);
8291 case DW_TAG_class_type:
8292 case DW_TAG_interface_type:
8293 case DW_TAG_structure_type:
8294 case DW_TAG_union_type:
8295 process_structure_scope (die, cu);
8297 case DW_TAG_enumeration_type:
8298 process_enumeration_scope (die, cu);
8301 /* These dies have a type, but processing them does not create
8302 a symbol or recurse to process the children. Therefore we can
8303 read them on-demand through read_type_die. */
8304 case DW_TAG_subroutine_type:
8305 case DW_TAG_set_type:
8306 case DW_TAG_array_type:
8307 case DW_TAG_pointer_type:
8308 case DW_TAG_ptr_to_member_type:
8309 case DW_TAG_reference_type:
8310 case DW_TAG_string_type:
8313 case DW_TAG_base_type:
8314 case DW_TAG_subrange_type:
8315 case DW_TAG_typedef:
8316 /* Add a typedef symbol for the type definition, if it has a
8318 new_symbol (die, read_type_die (die, cu), cu);
8320 case DW_TAG_common_block:
8321 read_common_block (die, cu);
8323 case DW_TAG_common_inclusion:
8325 case DW_TAG_namespace:
8326 cu->processing_has_namespace_info = 1;
8327 read_namespace (die, cu);
8330 cu->processing_has_namespace_info = 1;
8331 read_module (die, cu);
8333 case DW_TAG_imported_declaration:
8334 cu->processing_has_namespace_info = 1;
8335 if (read_namespace_alias (die, cu))
8337 /* The declaration is not a global namespace alias: fall through. */
8338 case DW_TAG_imported_module:
8339 cu->processing_has_namespace_info = 1;
8340 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
8341 || cu->language != language_fortran))
8342 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
8343 dwarf_tag_name (die->tag));
8344 read_import_statement (die, cu);
8347 case DW_TAG_imported_unit:
8348 process_imported_unit_die (die, cu);
8352 new_symbol (die, NULL, cu);
8356 do_cleanups (in_process);
8359 /* DWARF name computation. */
8361 /* A helper function for dwarf2_compute_name which determines whether DIE
8362 needs to have the name of the scope prepended to the name listed in the
8366 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
8368 struct attribute *attr;
8372 case DW_TAG_namespace:
8373 case DW_TAG_typedef:
8374 case DW_TAG_class_type:
8375 case DW_TAG_interface_type:
8376 case DW_TAG_structure_type:
8377 case DW_TAG_union_type:
8378 case DW_TAG_enumeration_type:
8379 case DW_TAG_enumerator:
8380 case DW_TAG_subprogram:
8381 case DW_TAG_inlined_subroutine:
8383 case DW_TAG_imported_declaration:
8386 case DW_TAG_variable:
8387 case DW_TAG_constant:
8388 /* We only need to prefix "globally" visible variables. These include
8389 any variable marked with DW_AT_external or any variable that
8390 lives in a namespace. [Variables in anonymous namespaces
8391 require prefixing, but they are not DW_AT_external.] */
8393 if (dwarf2_attr (die, DW_AT_specification, cu))
8395 struct dwarf2_cu *spec_cu = cu;
8397 return die_needs_namespace (die_specification (die, &spec_cu),
8401 attr = dwarf2_attr (die, DW_AT_external, cu);
8402 if (attr == NULL && die->parent->tag != DW_TAG_namespace
8403 && die->parent->tag != DW_TAG_module)
8405 /* A variable in a lexical block of some kind does not need a
8406 namespace, even though in C++ such variables may be external
8407 and have a mangled name. */
8408 if (die->parent->tag == DW_TAG_lexical_block
8409 || die->parent->tag == DW_TAG_try_block
8410 || die->parent->tag == DW_TAG_catch_block
8411 || die->parent->tag == DW_TAG_subprogram)
8420 /* Retrieve the last character from a mem_file. */
8423 do_ui_file_peek_last (void *object, const char *buffer, long length)
8425 char *last_char_p = (char *) object;
8428 *last_char_p = buffer[length - 1];
8431 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
8432 compute the physname for the object, which include a method's:
8433 - formal parameters (C++),
8434 - receiver type (Go),
8436 The term "physname" is a bit confusing.
8437 For C++, for example, it is the demangled name.
8438 For Go, for example, it's the mangled name.
8440 For Ada, return the DIE's linkage name rather than the fully qualified
8441 name. PHYSNAME is ignored..
8443 The result is allocated on the objfile_obstack and canonicalized. */
8446 dwarf2_compute_name (const char *name,
8447 struct die_info *die, struct dwarf2_cu *cu,
8450 struct objfile *objfile = cu->objfile;
8453 name = dwarf2_name (die, cu);
8455 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
8456 but otherwise compute it by typename_concat inside GDB.
8457 FIXME: Actually this is not really true, or at least not always true.
8458 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
8459 Fortran names because there is no mangling standard. So new_symbol_full
8460 will set the demangled name to the result of dwarf2_full_name, and it is
8461 the demangled name that GDB uses if it exists. */
8462 if (cu->language == language_ada
8463 || (cu->language == language_fortran && physname))
8465 /* For Ada unit, we prefer the linkage name over the name, as
8466 the former contains the exported name, which the user expects
8467 to be able to reference. Ideally, we want the user to be able
8468 to reference this entity using either natural or linkage name,
8469 but we haven't started looking at this enhancement yet. */
8470 const char *linkage_name;
8472 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
8473 if (linkage_name == NULL)
8474 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
8475 if (linkage_name != NULL)
8476 return linkage_name;
8479 /* These are the only languages we know how to qualify names in. */
8481 && (cu->language == language_cplus
8482 || cu->language == language_fortran || cu->language == language_d
8483 || cu->language == language_rust))
8485 if (die_needs_namespace (die, cu))
8489 struct ui_file *buf;
8490 const char *canonical_name = NULL;
8492 prefix = determine_prefix (die, cu);
8493 buf = mem_fileopen ();
8494 if (*prefix != '\0')
8496 char *prefixed_name = typename_concat (NULL, prefix, name,
8499 fputs_unfiltered (prefixed_name, buf);
8500 xfree (prefixed_name);
8503 fputs_unfiltered (name, buf);
8505 /* Template parameters may be specified in the DIE's DW_AT_name, or
8506 as children with DW_TAG_template_type_param or
8507 DW_TAG_value_type_param. If the latter, add them to the name
8508 here. If the name already has template parameters, then
8509 skip this step; some versions of GCC emit both, and
8510 it is more efficient to use the pre-computed name.
8512 Something to keep in mind about this process: it is very
8513 unlikely, or in some cases downright impossible, to produce
8514 something that will match the mangled name of a function.
8515 If the definition of the function has the same debug info,
8516 we should be able to match up with it anyway. But fallbacks
8517 using the minimal symbol, for instance to find a method
8518 implemented in a stripped copy of libstdc++, will not work.
8519 If we do not have debug info for the definition, we will have to
8520 match them up some other way.
8522 When we do name matching there is a related problem with function
8523 templates; two instantiated function templates are allowed to
8524 differ only by their return types, which we do not add here. */
8526 if (cu->language == language_cplus && strchr (name, '<') == NULL)
8528 struct attribute *attr;
8529 struct die_info *child;
8532 die->building_fullname = 1;
8534 for (child = die->child; child != NULL; child = child->sibling)
8538 const gdb_byte *bytes;
8539 struct dwarf2_locexpr_baton *baton;
8542 if (child->tag != DW_TAG_template_type_param
8543 && child->tag != DW_TAG_template_value_param)
8548 fputs_unfiltered ("<", buf);
8552 fputs_unfiltered (", ", buf);
8554 attr = dwarf2_attr (child, DW_AT_type, cu);
8557 complaint (&symfile_complaints,
8558 _("template parameter missing DW_AT_type"));
8559 fputs_unfiltered ("UNKNOWN_TYPE", buf);
8562 type = die_type (child, cu);
8564 if (child->tag == DW_TAG_template_type_param)
8566 c_print_type (type, "", buf, -1, 0, &type_print_raw_options);
8570 attr = dwarf2_attr (child, DW_AT_const_value, cu);
8573 complaint (&symfile_complaints,
8574 _("template parameter missing "
8575 "DW_AT_const_value"));
8576 fputs_unfiltered ("UNKNOWN_VALUE", buf);
8580 dwarf2_const_value_attr (attr, type, name,
8581 &cu->comp_unit_obstack, cu,
8582 &value, &bytes, &baton);
8584 if (TYPE_NOSIGN (type))
8585 /* GDB prints characters as NUMBER 'CHAR'. If that's
8586 changed, this can use value_print instead. */
8587 c_printchar (value, type, buf);
8590 struct value_print_options opts;
8593 v = dwarf2_evaluate_loc_desc (type, NULL,
8597 else if (bytes != NULL)
8599 v = allocate_value (type);
8600 memcpy (value_contents_writeable (v), bytes,
8601 TYPE_LENGTH (type));
8604 v = value_from_longest (type, value);
8606 /* Specify decimal so that we do not depend on
8608 get_formatted_print_options (&opts, 'd');
8610 value_print (v, buf, &opts);
8616 die->building_fullname = 0;
8620 /* Close the argument list, with a space if necessary
8621 (nested templates). */
8622 char last_char = '\0';
8623 ui_file_put (buf, do_ui_file_peek_last, &last_char);
8624 if (last_char == '>')
8625 fputs_unfiltered (" >", buf);
8627 fputs_unfiltered (">", buf);
8631 /* For C++ methods, append formal parameter type
8632 information, if PHYSNAME. */
8634 if (physname && die->tag == DW_TAG_subprogram
8635 && cu->language == language_cplus)
8637 struct type *type = read_type_die (die, cu);
8639 c_type_print_args (type, buf, 1, cu->language,
8640 &type_print_raw_options);
8642 if (cu->language == language_cplus)
8644 /* Assume that an artificial first parameter is
8645 "this", but do not crash if it is not. RealView
8646 marks unnamed (and thus unused) parameters as
8647 artificial; there is no way to differentiate
8649 if (TYPE_NFIELDS (type) > 0
8650 && TYPE_FIELD_ARTIFICIAL (type, 0)
8651 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8652 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8654 fputs_unfiltered (" const", buf);
8658 std::string intermediate_name = ui_file_as_string (buf);
8659 ui_file_delete (buf);
8661 if (cu->language == language_cplus)
8663 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
8664 &objfile->per_bfd->storage_obstack);
8666 /* If we only computed INTERMEDIATE_NAME, or if
8667 INTERMEDIATE_NAME is already canonical, then we need to
8668 copy it to the appropriate obstack. */
8669 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
8670 name = ((const char *)
8671 obstack_copy0 (&objfile->per_bfd->storage_obstack,
8672 intermediate_name.c_str (),
8673 intermediate_name.length ()));
8675 name = canonical_name;
8682 /* Return the fully qualified name of DIE, based on its DW_AT_name.
8683 If scope qualifiers are appropriate they will be added. The result
8684 will be allocated on the storage_obstack, or NULL if the DIE does
8685 not have a name. NAME may either be from a previous call to
8686 dwarf2_name or NULL.
8688 The output string will be canonicalized (if C++). */
8691 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8693 return dwarf2_compute_name (name, die, cu, 0);
8696 /* Construct a physname for the given DIE in CU. NAME may either be
8697 from a previous call to dwarf2_name or NULL. The result will be
8698 allocated on the objfile_objstack or NULL if the DIE does not have a
8701 The output string will be canonicalized (if C++). */
8704 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8706 struct objfile *objfile = cu->objfile;
8707 const char *retval, *mangled = NULL, *canon = NULL;
8708 struct cleanup *back_to;
8711 /* In this case dwarf2_compute_name is just a shortcut not building anything
8713 if (!die_needs_namespace (die, cu))
8714 return dwarf2_compute_name (name, die, cu, 1);
8716 back_to = make_cleanup (null_cleanup, NULL);
8718 mangled = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
8719 if (mangled == NULL)
8720 mangled = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
8722 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
8723 See https://github.com/rust-lang/rust/issues/32925. */
8724 if (cu->language == language_rust && mangled != NULL
8725 && strchr (mangled, '{') != NULL)
8728 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
8730 if (mangled != NULL)
8734 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
8735 type. It is easier for GDB users to search for such functions as
8736 `name(params)' than `long name(params)'. In such case the minimal
8737 symbol names do not match the full symbol names but for template
8738 functions there is never a need to look up their definition from their
8739 declaration so the only disadvantage remains the minimal symbol
8740 variant `long name(params)' does not have the proper inferior type.
8743 if (cu->language == language_go)
8745 /* This is a lie, but we already lie to the caller new_symbol_full.
8746 new_symbol_full assumes we return the mangled name.
8747 This just undoes that lie until things are cleaned up. */
8752 demangled = gdb_demangle (mangled,
8753 (DMGL_PARAMS | DMGL_ANSI | DMGL_RET_DROP));
8757 make_cleanup (xfree, demangled);
8767 if (canon == NULL || check_physname)
8769 const char *physname = dwarf2_compute_name (name, die, cu, 1);
8771 if (canon != NULL && strcmp (physname, canon) != 0)
8773 /* It may not mean a bug in GDB. The compiler could also
8774 compute DW_AT_linkage_name incorrectly. But in such case
8775 GDB would need to be bug-to-bug compatible. */
8777 complaint (&symfile_complaints,
8778 _("Computed physname <%s> does not match demangled <%s> "
8779 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
8780 physname, canon, mangled, die->offset.sect_off,
8781 objfile_name (objfile));
8783 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
8784 is available here - over computed PHYSNAME. It is safer
8785 against both buggy GDB and buggy compilers. */
8799 retval = ((const char *)
8800 obstack_copy0 (&objfile->per_bfd->storage_obstack,
8801 retval, strlen (retval)));
8803 do_cleanups (back_to);
8807 /* Inspect DIE in CU for a namespace alias. If one exists, record
8808 a new symbol for it.
8810 Returns 1 if a namespace alias was recorded, 0 otherwise. */
8813 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
8815 struct attribute *attr;
8817 /* If the die does not have a name, this is not a namespace
8819 attr = dwarf2_attr (die, DW_AT_name, cu);
8823 struct die_info *d = die;
8824 struct dwarf2_cu *imported_cu = cu;
8826 /* If the compiler has nested DW_AT_imported_declaration DIEs,
8827 keep inspecting DIEs until we hit the underlying import. */
8828 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
8829 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
8831 attr = dwarf2_attr (d, DW_AT_import, cu);
8835 d = follow_die_ref (d, attr, &imported_cu);
8836 if (d->tag != DW_TAG_imported_declaration)
8840 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
8842 complaint (&symfile_complaints,
8843 _("DIE at 0x%x has too many recursively imported "
8844 "declarations"), d->offset.sect_off);
8851 sect_offset offset = dwarf2_get_ref_die_offset (attr);
8853 type = get_die_type_at_offset (offset, cu->per_cu);
8854 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
8856 /* This declaration is a global namespace alias. Add
8857 a symbol for it whose type is the aliased namespace. */
8858 new_symbol (die, type, cu);
8867 /* Return the using directives repository (global or local?) to use in the
8868 current context for LANGUAGE.
8870 For Ada, imported declarations can materialize renamings, which *may* be
8871 global. However it is impossible (for now?) in DWARF to distinguish
8872 "external" imported declarations and "static" ones. As all imported
8873 declarations seem to be static in all other languages, make them all CU-wide
8874 global only in Ada. */
8876 static struct using_direct **
8877 using_directives (enum language language)
8879 if (language == language_ada && context_stack_depth == 0)
8880 return &global_using_directives;
8882 return &local_using_directives;
8885 /* Read the import statement specified by the given die and record it. */
8888 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
8890 struct objfile *objfile = cu->objfile;
8891 struct attribute *import_attr;
8892 struct die_info *imported_die, *child_die;
8893 struct dwarf2_cu *imported_cu;
8894 const char *imported_name;
8895 const char *imported_name_prefix;
8896 const char *canonical_name;
8897 const char *import_alias;
8898 const char *imported_declaration = NULL;
8899 const char *import_prefix;
8900 VEC (const_char_ptr) *excludes = NULL;
8901 struct cleanup *cleanups;
8903 import_attr = dwarf2_attr (die, DW_AT_import, cu);
8904 if (import_attr == NULL)
8906 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8907 dwarf_tag_name (die->tag));
8912 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
8913 imported_name = dwarf2_name (imported_die, imported_cu);
8914 if (imported_name == NULL)
8916 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
8918 The import in the following code:
8932 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
8933 <52> DW_AT_decl_file : 1
8934 <53> DW_AT_decl_line : 6
8935 <54> DW_AT_import : <0x75>
8936 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
8938 <5b> DW_AT_decl_file : 1
8939 <5c> DW_AT_decl_line : 2
8940 <5d> DW_AT_type : <0x6e>
8942 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
8943 <76> DW_AT_byte_size : 4
8944 <77> DW_AT_encoding : 5 (signed)
8946 imports the wrong die ( 0x75 instead of 0x58 ).
8947 This case will be ignored until the gcc bug is fixed. */
8951 /* Figure out the local name after import. */
8952 import_alias = dwarf2_name (die, cu);
8954 /* Figure out where the statement is being imported to. */
8955 import_prefix = determine_prefix (die, cu);
8957 /* Figure out what the scope of the imported die is and prepend it
8958 to the name of the imported die. */
8959 imported_name_prefix = determine_prefix (imported_die, imported_cu);
8961 if (imported_die->tag != DW_TAG_namespace
8962 && imported_die->tag != DW_TAG_module)
8964 imported_declaration = imported_name;
8965 canonical_name = imported_name_prefix;
8967 else if (strlen (imported_name_prefix) > 0)
8968 canonical_name = obconcat (&objfile->objfile_obstack,
8969 imported_name_prefix,
8970 (cu->language == language_d ? "." : "::"),
8971 imported_name, (char *) NULL);
8973 canonical_name = imported_name;
8975 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
8977 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
8978 for (child_die = die->child; child_die && child_die->tag;
8979 child_die = sibling_die (child_die))
8981 /* DWARF-4: A Fortran use statement with a “rename list” may be
8982 represented by an imported module entry with an import attribute
8983 referring to the module and owned entries corresponding to those
8984 entities that are renamed as part of being imported. */
8986 if (child_die->tag != DW_TAG_imported_declaration)
8988 complaint (&symfile_complaints,
8989 _("child DW_TAG_imported_declaration expected "
8990 "- DIE at 0x%x [in module %s]"),
8991 child_die->offset.sect_off, objfile_name (objfile));
8995 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
8996 if (import_attr == NULL)
8998 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8999 dwarf_tag_name (child_die->tag));
9004 imported_die = follow_die_ref_or_sig (child_die, import_attr,
9006 imported_name = dwarf2_name (imported_die, imported_cu);
9007 if (imported_name == NULL)
9009 complaint (&symfile_complaints,
9010 _("child DW_TAG_imported_declaration has unknown "
9011 "imported name - DIE at 0x%x [in module %s]"),
9012 child_die->offset.sect_off, objfile_name (objfile));
9016 VEC_safe_push (const_char_ptr, excludes, imported_name);
9018 process_die (child_die, cu);
9021 add_using_directive (using_directives (cu->language),
9025 imported_declaration,
9028 &objfile->objfile_obstack);
9030 do_cleanups (cleanups);
9033 /* Cleanup function for handle_DW_AT_stmt_list. */
9036 free_cu_line_header (void *arg)
9038 struct dwarf2_cu *cu = (struct dwarf2_cu *) arg;
9040 free_line_header (cu->line_header);
9041 cu->line_header = NULL;
9044 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
9045 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
9046 this, it was first present in GCC release 4.3.0. */
9049 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
9051 if (!cu->checked_producer)
9052 check_producer (cu);
9054 return cu->producer_is_gcc_lt_4_3;
9058 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu,
9059 const char **name, const char **comp_dir)
9061 /* Find the filename. Do not use dwarf2_name here, since the filename
9062 is not a source language identifier. */
9063 *name = dwarf2_string_attr (die, DW_AT_name, cu);
9064 *comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
9066 if (*comp_dir == NULL
9067 && producer_is_gcc_lt_4_3 (cu) && *name != NULL
9068 && IS_ABSOLUTE_PATH (*name))
9070 char *d = ldirname (*name);
9074 make_cleanup (xfree, d);
9076 if (*comp_dir != NULL)
9078 /* Irix 6.2 native cc prepends <machine>.: to the compilation
9079 directory, get rid of it. */
9080 const char *cp = strchr (*comp_dir, ':');
9082 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/')
9087 *name = "<unknown>";
9090 /* Handle DW_AT_stmt_list for a compilation unit.
9091 DIE is the DW_TAG_compile_unit die for CU.
9092 COMP_DIR is the compilation directory. LOWPC is passed to
9093 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
9096 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
9097 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
9099 struct objfile *objfile = dwarf2_per_objfile->objfile;
9100 struct attribute *attr;
9101 unsigned int line_offset;
9102 struct line_header line_header_local;
9103 hashval_t line_header_local_hash;
9108 gdb_assert (! cu->per_cu->is_debug_types);
9110 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9114 line_offset = DW_UNSND (attr);
9116 /* The line header hash table is only created if needed (it exists to
9117 prevent redundant reading of the line table for partial_units).
9118 If we're given a partial_unit, we'll need it. If we're given a
9119 compile_unit, then use the line header hash table if it's already
9120 created, but don't create one just yet. */
9122 if (dwarf2_per_objfile->line_header_hash == NULL
9123 && die->tag == DW_TAG_partial_unit)
9125 dwarf2_per_objfile->line_header_hash
9126 = htab_create_alloc_ex (127, line_header_hash_voidp,
9127 line_header_eq_voidp,
9128 free_line_header_voidp,
9129 &objfile->objfile_obstack,
9130 hashtab_obstack_allocate,
9131 dummy_obstack_deallocate);
9134 line_header_local.offset.sect_off = line_offset;
9135 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
9136 line_header_local_hash = line_header_hash (&line_header_local);
9137 if (dwarf2_per_objfile->line_header_hash != NULL)
9139 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9141 line_header_local_hash, NO_INSERT);
9143 /* For DW_TAG_compile_unit we need info like symtab::linetable which
9144 is not present in *SLOT (since if there is something in *SLOT then
9145 it will be for a partial_unit). */
9146 if (die->tag == DW_TAG_partial_unit && slot != NULL)
9148 gdb_assert (*slot != NULL);
9149 cu->line_header = (struct line_header *) *slot;
9154 /* dwarf_decode_line_header does not yet provide sufficient information.
9155 We always have to call also dwarf_decode_lines for it. */
9156 cu->line_header = dwarf_decode_line_header (line_offset, cu);
9157 if (cu->line_header == NULL)
9160 if (dwarf2_per_objfile->line_header_hash == NULL)
9164 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9166 line_header_local_hash, INSERT);
9167 gdb_assert (slot != NULL);
9169 if (slot != NULL && *slot == NULL)
9171 /* This newly decoded line number information unit will be owned
9172 by line_header_hash hash table. */
9173 *slot = cu->line_header;
9177 /* We cannot free any current entry in (*slot) as that struct line_header
9178 may be already used by multiple CUs. Create only temporary decoded
9179 line_header for this CU - it may happen at most once for each line
9180 number information unit. And if we're not using line_header_hash
9181 then this is what we want as well. */
9182 gdb_assert (die->tag != DW_TAG_partial_unit);
9183 make_cleanup (free_cu_line_header, cu);
9185 decode_mapping = (die->tag != DW_TAG_partial_unit);
9186 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
9190 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
9193 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
9195 struct objfile *objfile = dwarf2_per_objfile->objfile;
9196 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9197 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
9198 CORE_ADDR lowpc = ((CORE_ADDR) -1);
9199 CORE_ADDR highpc = ((CORE_ADDR) 0);
9200 struct attribute *attr;
9201 const char *name = NULL;
9202 const char *comp_dir = NULL;
9203 struct die_info *child_die;
9206 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9208 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
9210 /* If we didn't find a lowpc, set it to highpc to avoid complaints
9211 from finish_block. */
9212 if (lowpc == ((CORE_ADDR) -1))
9214 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
9216 find_file_and_directory (die, cu, &name, &comp_dir);
9218 prepare_one_comp_unit (cu, die, cu->language);
9220 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
9221 standardised yet. As a workaround for the language detection we fall
9222 back to the DW_AT_producer string. */
9223 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
9224 cu->language = language_opencl;
9226 /* Similar hack for Go. */
9227 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
9228 set_cu_language (DW_LANG_Go, cu);
9230 dwarf2_start_symtab (cu, name, comp_dir, lowpc);
9232 /* Decode line number information if present. We do this before
9233 processing child DIEs, so that the line header table is available
9234 for DW_AT_decl_file. */
9235 handle_DW_AT_stmt_list (die, cu, comp_dir, lowpc);
9237 /* Process all dies in compilation unit. */
9238 if (die->child != NULL)
9240 child_die = die->child;
9241 while (child_die && child_die->tag)
9243 process_die (child_die, cu);
9244 child_die = sibling_die (child_die);
9248 /* Decode macro information, if present. Dwarf 2 macro information
9249 refers to information in the line number info statement program
9250 header, so we can only read it if we've read the header
9252 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
9253 if (attr && cu->line_header)
9255 if (dwarf2_attr (die, DW_AT_macro_info, cu))
9256 complaint (&symfile_complaints,
9257 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
9259 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
9263 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
9264 if (attr && cu->line_header)
9266 unsigned int macro_offset = DW_UNSND (attr);
9268 dwarf_decode_macros (cu, macro_offset, 0);
9272 do_cleanups (back_to);
9275 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
9276 Create the set of symtabs used by this TU, or if this TU is sharing
9277 symtabs with another TU and the symtabs have already been created
9278 then restore those symtabs in the line header.
9279 We don't need the pc/line-number mapping for type units. */
9282 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
9284 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
9285 struct type_unit_group *tu_group;
9287 struct line_header *lh;
9288 struct attribute *attr;
9289 unsigned int i, line_offset;
9290 struct signatured_type *sig_type;
9292 gdb_assert (per_cu->is_debug_types);
9293 sig_type = (struct signatured_type *) per_cu;
9295 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9297 /* If we're using .gdb_index (includes -readnow) then
9298 per_cu->type_unit_group may not have been set up yet. */
9299 if (sig_type->type_unit_group == NULL)
9300 sig_type->type_unit_group = get_type_unit_group (cu, attr);
9301 tu_group = sig_type->type_unit_group;
9303 /* If we've already processed this stmt_list there's no real need to
9304 do it again, we could fake it and just recreate the part we need
9305 (file name,index -> symtab mapping). If data shows this optimization
9306 is useful we can do it then. */
9307 first_time = tu_group->compunit_symtab == NULL;
9309 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
9314 line_offset = DW_UNSND (attr);
9315 lh = dwarf_decode_line_header (line_offset, cu);
9320 dwarf2_start_symtab (cu, "", NULL, 0);
9323 gdb_assert (tu_group->symtabs == NULL);
9324 restart_symtab (tu_group->compunit_symtab, "", 0);
9329 cu->line_header = lh;
9330 make_cleanup (free_cu_line_header, cu);
9334 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
9336 /* Note: We don't assign tu_group->compunit_symtab yet because we're
9337 still initializing it, and our caller (a few levels up)
9338 process_full_type_unit still needs to know if this is the first
9341 tu_group->num_symtabs = lh->num_file_names;
9342 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names);
9344 for (i = 0; i < lh->num_file_names; ++i)
9346 const char *dir = NULL;
9347 struct file_entry *fe = &lh->file_names[i];
9349 if (fe->dir_index && lh->include_dirs != NULL)
9350 dir = lh->include_dirs[fe->dir_index - 1];
9351 dwarf2_start_subfile (fe->name, dir);
9353 if (current_subfile->symtab == NULL)
9355 /* NOTE: start_subfile will recognize when it's been passed
9356 a file it has already seen. So we can't assume there's a
9357 simple mapping from lh->file_names to subfiles, plus
9358 lh->file_names may contain dups. */
9359 current_subfile->symtab
9360 = allocate_symtab (cust, current_subfile->name);
9363 fe->symtab = current_subfile->symtab;
9364 tu_group->symtabs[i] = fe->symtab;
9369 restart_symtab (tu_group->compunit_symtab, "", 0);
9371 for (i = 0; i < lh->num_file_names; ++i)
9373 struct file_entry *fe = &lh->file_names[i];
9375 fe->symtab = tu_group->symtabs[i];
9379 /* The main symtab is allocated last. Type units don't have DW_AT_name
9380 so they don't have a "real" (so to speak) symtab anyway.
9381 There is later code that will assign the main symtab to all symbols
9382 that don't have one. We need to handle the case of a symbol with a
9383 missing symtab (DW_AT_decl_file) anyway. */
9386 /* Process DW_TAG_type_unit.
9387 For TUs we want to skip the first top level sibling if it's not the
9388 actual type being defined by this TU. In this case the first top
9389 level sibling is there to provide context only. */
9392 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
9394 struct die_info *child_die;
9396 prepare_one_comp_unit (cu, die, language_minimal);
9398 /* Initialize (or reinitialize) the machinery for building symtabs.
9399 We do this before processing child DIEs, so that the line header table
9400 is available for DW_AT_decl_file. */
9401 setup_type_unit_groups (die, cu);
9403 if (die->child != NULL)
9405 child_die = die->child;
9406 while (child_die && child_die->tag)
9408 process_die (child_die, cu);
9409 child_die = sibling_die (child_die);
9416 http://gcc.gnu.org/wiki/DebugFission
9417 http://gcc.gnu.org/wiki/DebugFissionDWP
9419 To simplify handling of both DWO files ("object" files with the DWARF info)
9420 and DWP files (a file with the DWOs packaged up into one file), we treat
9421 DWP files as having a collection of virtual DWO files. */
9424 hash_dwo_file (const void *item)
9426 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
9429 hash = htab_hash_string (dwo_file->dwo_name);
9430 if (dwo_file->comp_dir != NULL)
9431 hash += htab_hash_string (dwo_file->comp_dir);
9436 eq_dwo_file (const void *item_lhs, const void *item_rhs)
9438 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
9439 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
9441 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
9443 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
9444 return lhs->comp_dir == rhs->comp_dir;
9445 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
9448 /* Allocate a hash table for DWO files. */
9451 allocate_dwo_file_hash_table (void)
9453 struct objfile *objfile = dwarf2_per_objfile->objfile;
9455 return htab_create_alloc_ex (41,
9459 &objfile->objfile_obstack,
9460 hashtab_obstack_allocate,
9461 dummy_obstack_deallocate);
9464 /* Lookup DWO file DWO_NAME. */
9467 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
9469 struct dwo_file find_entry;
9472 if (dwarf2_per_objfile->dwo_files == NULL)
9473 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
9475 memset (&find_entry, 0, sizeof (find_entry));
9476 find_entry.dwo_name = dwo_name;
9477 find_entry.comp_dir = comp_dir;
9478 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
9484 hash_dwo_unit (const void *item)
9486 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
9488 /* This drops the top 32 bits of the id, but is ok for a hash. */
9489 return dwo_unit->signature;
9493 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
9495 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
9496 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
9498 /* The signature is assumed to be unique within the DWO file.
9499 So while object file CU dwo_id's always have the value zero,
9500 that's OK, assuming each object file DWO file has only one CU,
9501 and that's the rule for now. */
9502 return lhs->signature == rhs->signature;
9505 /* Allocate a hash table for DWO CUs,TUs.
9506 There is one of these tables for each of CUs,TUs for each DWO file. */
9509 allocate_dwo_unit_table (struct objfile *objfile)
9511 /* Start out with a pretty small number.
9512 Generally DWO files contain only one CU and maybe some TUs. */
9513 return htab_create_alloc_ex (3,
9517 &objfile->objfile_obstack,
9518 hashtab_obstack_allocate,
9519 dummy_obstack_deallocate);
9522 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
9524 struct create_dwo_cu_data
9526 struct dwo_file *dwo_file;
9527 struct dwo_unit dwo_unit;
9530 /* die_reader_func for create_dwo_cu. */
9533 create_dwo_cu_reader (const struct die_reader_specs *reader,
9534 const gdb_byte *info_ptr,
9535 struct die_info *comp_unit_die,
9539 struct dwarf2_cu *cu = reader->cu;
9540 sect_offset offset = cu->per_cu->offset;
9541 struct dwarf2_section_info *section = cu->per_cu->section;
9542 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
9543 struct dwo_file *dwo_file = data->dwo_file;
9544 struct dwo_unit *dwo_unit = &data->dwo_unit;
9545 struct attribute *attr;
9547 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
9550 complaint (&symfile_complaints,
9551 _("Dwarf Error: debug entry at offset 0x%x is missing"
9552 " its dwo_id [in module %s]"),
9553 offset.sect_off, dwo_file->dwo_name);
9557 dwo_unit->dwo_file = dwo_file;
9558 dwo_unit->signature = DW_UNSND (attr);
9559 dwo_unit->section = section;
9560 dwo_unit->offset = offset;
9561 dwo_unit->length = cu->per_cu->length;
9563 if (dwarf_read_debug)
9564 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
9565 offset.sect_off, hex_string (dwo_unit->signature));
9568 /* Create the dwo_unit for the lone CU in DWO_FILE.
9569 Note: This function processes DWO files only, not DWP files. */
9571 static struct dwo_unit *
9572 create_dwo_cu (struct dwo_file *dwo_file)
9574 struct objfile *objfile = dwarf2_per_objfile->objfile;
9575 struct dwarf2_section_info *section = &dwo_file->sections.info;
9576 const gdb_byte *info_ptr, *end_ptr;
9577 struct create_dwo_cu_data create_dwo_cu_data;
9578 struct dwo_unit *dwo_unit;
9580 dwarf2_read_section (objfile, section);
9581 info_ptr = section->buffer;
9583 if (info_ptr == NULL)
9586 if (dwarf_read_debug)
9588 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
9589 get_section_name (section),
9590 get_section_file_name (section));
9593 create_dwo_cu_data.dwo_file = dwo_file;
9596 end_ptr = info_ptr + section->size;
9597 while (info_ptr < end_ptr)
9599 struct dwarf2_per_cu_data per_cu;
9601 memset (&create_dwo_cu_data.dwo_unit, 0,
9602 sizeof (create_dwo_cu_data.dwo_unit));
9603 memset (&per_cu, 0, sizeof (per_cu));
9604 per_cu.objfile = objfile;
9605 per_cu.is_debug_types = 0;
9606 per_cu.offset.sect_off = info_ptr - section->buffer;
9607 per_cu.section = section;
9609 init_cutu_and_read_dies_no_follow (&per_cu, dwo_file,
9610 create_dwo_cu_reader,
9611 &create_dwo_cu_data);
9613 if (create_dwo_cu_data.dwo_unit.dwo_file != NULL)
9615 /* If we've already found one, complain. We only support one
9616 because having more than one requires hacking the dwo_name of
9617 each to match, which is highly unlikely to happen. */
9618 if (dwo_unit != NULL)
9620 complaint (&symfile_complaints,
9621 _("Multiple CUs in DWO file %s [in module %s]"),
9622 dwo_file->dwo_name, objfile_name (objfile));
9626 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9627 *dwo_unit = create_dwo_cu_data.dwo_unit;
9630 info_ptr += per_cu.length;
9636 /* DWP file .debug_{cu,tu}_index section format:
9637 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
9641 Both index sections have the same format, and serve to map a 64-bit
9642 signature to a set of section numbers. Each section begins with a header,
9643 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
9644 indexes, and a pool of 32-bit section numbers. The index sections will be
9645 aligned at 8-byte boundaries in the file.
9647 The index section header consists of:
9649 V, 32 bit version number
9651 N, 32 bit number of compilation units or type units in the index
9652 M, 32 bit number of slots in the hash table
9654 Numbers are recorded using the byte order of the application binary.
9656 The hash table begins at offset 16 in the section, and consists of an array
9657 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
9658 order of the application binary). Unused slots in the hash table are 0.
9659 (We rely on the extreme unlikeliness of a signature being exactly 0.)
9661 The parallel table begins immediately after the hash table
9662 (at offset 16 + 8 * M from the beginning of the section), and consists of an
9663 array of 32-bit indexes (using the byte order of the application binary),
9664 corresponding 1-1 with slots in the hash table. Each entry in the parallel
9665 table contains a 32-bit index into the pool of section numbers. For unused
9666 hash table slots, the corresponding entry in the parallel table will be 0.
9668 The pool of section numbers begins immediately following the hash table
9669 (at offset 16 + 12 * M from the beginning of the section). The pool of
9670 section numbers consists of an array of 32-bit words (using the byte order
9671 of the application binary). Each item in the array is indexed starting
9672 from 0. The hash table entry provides the index of the first section
9673 number in the set. Additional section numbers in the set follow, and the
9674 set is terminated by a 0 entry (section number 0 is not used in ELF).
9676 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
9677 section must be the first entry in the set, and the .debug_abbrev.dwo must
9678 be the second entry. Other members of the set may follow in any order.
9684 DWP Version 2 combines all the .debug_info, etc. sections into one,
9685 and the entries in the index tables are now offsets into these sections.
9686 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
9689 Index Section Contents:
9691 Hash Table of Signatures dwp_hash_table.hash_table
9692 Parallel Table of Indices dwp_hash_table.unit_table
9693 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
9694 Table of Section Sizes dwp_hash_table.v2.sizes
9696 The index section header consists of:
9698 V, 32 bit version number
9699 L, 32 bit number of columns in the table of section offsets
9700 N, 32 bit number of compilation units or type units in the index
9701 M, 32 bit number of slots in the hash table
9703 Numbers are recorded using the byte order of the application binary.
9705 The hash table has the same format as version 1.
9706 The parallel table of indices has the same format as version 1,
9707 except that the entries are origin-1 indices into the table of sections
9708 offsets and the table of section sizes.
9710 The table of offsets begins immediately following the parallel table
9711 (at offset 16 + 12 * M from the beginning of the section). The table is
9712 a two-dimensional array of 32-bit words (using the byte order of the
9713 application binary), with L columns and N+1 rows, in row-major order.
9714 Each row in the array is indexed starting from 0. The first row provides
9715 a key to the remaining rows: each column in this row provides an identifier
9716 for a debug section, and the offsets in the same column of subsequent rows
9717 refer to that section. The section identifiers are:
9719 DW_SECT_INFO 1 .debug_info.dwo
9720 DW_SECT_TYPES 2 .debug_types.dwo
9721 DW_SECT_ABBREV 3 .debug_abbrev.dwo
9722 DW_SECT_LINE 4 .debug_line.dwo
9723 DW_SECT_LOC 5 .debug_loc.dwo
9724 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
9725 DW_SECT_MACINFO 7 .debug_macinfo.dwo
9726 DW_SECT_MACRO 8 .debug_macro.dwo
9728 The offsets provided by the CU and TU index sections are the base offsets
9729 for the contributions made by each CU or TU to the corresponding section
9730 in the package file. Each CU and TU header contains an abbrev_offset
9731 field, used to find the abbreviations table for that CU or TU within the
9732 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
9733 be interpreted as relative to the base offset given in the index section.
9734 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
9735 should be interpreted as relative to the base offset for .debug_line.dwo,
9736 and offsets into other debug sections obtained from DWARF attributes should
9737 also be interpreted as relative to the corresponding base offset.
9739 The table of sizes begins immediately following the table of offsets.
9740 Like the table of offsets, it is a two-dimensional array of 32-bit words,
9741 with L columns and N rows, in row-major order. Each row in the array is
9742 indexed starting from 1 (row 0 is shared by the two tables).
9746 Hash table lookup is handled the same in version 1 and 2:
9748 We assume that N and M will not exceed 2^32 - 1.
9749 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
9751 Given a 64-bit compilation unit signature or a type signature S, an entry
9752 in the hash table is located as follows:
9754 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
9755 the low-order k bits all set to 1.
9757 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
9759 3) If the hash table entry at index H matches the signature, use that
9760 entry. If the hash table entry at index H is unused (all zeroes),
9761 terminate the search: the signature is not present in the table.
9763 4) Let H = (H + H') modulo M. Repeat at Step 3.
9765 Because M > N and H' and M are relatively prime, the search is guaranteed
9766 to stop at an unused slot or find the match. */
9768 /* Create a hash table to map DWO IDs to their CU/TU entry in
9769 .debug_{info,types}.dwo in DWP_FILE.
9770 Returns NULL if there isn't one.
9771 Note: This function processes DWP files only, not DWO files. */
9773 static struct dwp_hash_table *
9774 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
9776 struct objfile *objfile = dwarf2_per_objfile->objfile;
9777 bfd *dbfd = dwp_file->dbfd;
9778 const gdb_byte *index_ptr, *index_end;
9779 struct dwarf2_section_info *index;
9780 uint32_t version, nr_columns, nr_units, nr_slots;
9781 struct dwp_hash_table *htab;
9784 index = &dwp_file->sections.tu_index;
9786 index = &dwp_file->sections.cu_index;
9788 if (dwarf2_section_empty_p (index))
9790 dwarf2_read_section (objfile, index);
9792 index_ptr = index->buffer;
9793 index_end = index_ptr + index->size;
9795 version = read_4_bytes (dbfd, index_ptr);
9798 nr_columns = read_4_bytes (dbfd, index_ptr);
9802 nr_units = read_4_bytes (dbfd, index_ptr);
9804 nr_slots = read_4_bytes (dbfd, index_ptr);
9807 if (version != 1 && version != 2)
9809 error (_("Dwarf Error: unsupported DWP file version (%s)"
9811 pulongest (version), dwp_file->name);
9813 if (nr_slots != (nr_slots & -nr_slots))
9815 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
9816 " is not power of 2 [in module %s]"),
9817 pulongest (nr_slots), dwp_file->name);
9820 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
9821 htab->version = version;
9822 htab->nr_columns = nr_columns;
9823 htab->nr_units = nr_units;
9824 htab->nr_slots = nr_slots;
9825 htab->hash_table = index_ptr;
9826 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
9828 /* Exit early if the table is empty. */
9829 if (nr_slots == 0 || nr_units == 0
9830 || (version == 2 && nr_columns == 0))
9832 /* All must be zero. */
9833 if (nr_slots != 0 || nr_units != 0
9834 || (version == 2 && nr_columns != 0))
9836 complaint (&symfile_complaints,
9837 _("Empty DWP but nr_slots,nr_units,nr_columns not"
9838 " all zero [in modules %s]"),
9846 htab->section_pool.v1.indices =
9847 htab->unit_table + sizeof (uint32_t) * nr_slots;
9848 /* It's harder to decide whether the section is too small in v1.
9849 V1 is deprecated anyway so we punt. */
9853 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
9854 int *ids = htab->section_pool.v2.section_ids;
9855 /* Reverse map for error checking. */
9856 int ids_seen[DW_SECT_MAX + 1];
9861 error (_("Dwarf Error: bad DWP hash table, too few columns"
9862 " in section table [in module %s]"),
9865 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
9867 error (_("Dwarf Error: bad DWP hash table, too many columns"
9868 " in section table [in module %s]"),
9871 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
9872 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
9873 for (i = 0; i < nr_columns; ++i)
9875 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
9877 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
9879 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
9880 " in section table [in module %s]"),
9881 id, dwp_file->name);
9883 if (ids_seen[id] != -1)
9885 error (_("Dwarf Error: bad DWP hash table, duplicate section"
9886 " id %d in section table [in module %s]"),
9887 id, dwp_file->name);
9892 /* Must have exactly one info or types section. */
9893 if (((ids_seen[DW_SECT_INFO] != -1)
9894 + (ids_seen[DW_SECT_TYPES] != -1))
9897 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
9898 " DWO info/types section [in module %s]"),
9901 /* Must have an abbrev section. */
9902 if (ids_seen[DW_SECT_ABBREV] == -1)
9904 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
9905 " section [in module %s]"),
9908 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
9909 htab->section_pool.v2.sizes =
9910 htab->section_pool.v2.offsets + (sizeof (uint32_t)
9911 * nr_units * nr_columns);
9912 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
9913 * nr_units * nr_columns))
9916 error (_("Dwarf Error: DWP index section is corrupt (too small)"
9925 /* Update SECTIONS with the data from SECTP.
9927 This function is like the other "locate" section routines that are
9928 passed to bfd_map_over_sections, but in this context the sections to
9929 read comes from the DWP V1 hash table, not the full ELF section table.
9931 The result is non-zero for success, or zero if an error was found. */
9934 locate_v1_virtual_dwo_sections (asection *sectp,
9935 struct virtual_v1_dwo_sections *sections)
9937 const struct dwop_section_names *names = &dwop_section_names;
9939 if (section_is_p (sectp->name, &names->abbrev_dwo))
9941 /* There can be only one. */
9942 if (sections->abbrev.s.section != NULL)
9944 sections->abbrev.s.section = sectp;
9945 sections->abbrev.size = bfd_get_section_size (sectp);
9947 else if (section_is_p (sectp->name, &names->info_dwo)
9948 || section_is_p (sectp->name, &names->types_dwo))
9950 /* There can be only one. */
9951 if (sections->info_or_types.s.section != NULL)
9953 sections->info_or_types.s.section = sectp;
9954 sections->info_or_types.size = bfd_get_section_size (sectp);
9956 else if (section_is_p (sectp->name, &names->line_dwo))
9958 /* There can be only one. */
9959 if (sections->line.s.section != NULL)
9961 sections->line.s.section = sectp;
9962 sections->line.size = bfd_get_section_size (sectp);
9964 else if (section_is_p (sectp->name, &names->loc_dwo))
9966 /* There can be only one. */
9967 if (sections->loc.s.section != NULL)
9969 sections->loc.s.section = sectp;
9970 sections->loc.size = bfd_get_section_size (sectp);
9972 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9974 /* There can be only one. */
9975 if (sections->macinfo.s.section != NULL)
9977 sections->macinfo.s.section = sectp;
9978 sections->macinfo.size = bfd_get_section_size (sectp);
9980 else if (section_is_p (sectp->name, &names->macro_dwo))
9982 /* There can be only one. */
9983 if (sections->macro.s.section != NULL)
9985 sections->macro.s.section = sectp;
9986 sections->macro.size = bfd_get_section_size (sectp);
9988 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9990 /* There can be only one. */
9991 if (sections->str_offsets.s.section != NULL)
9993 sections->str_offsets.s.section = sectp;
9994 sections->str_offsets.size = bfd_get_section_size (sectp);
9998 /* No other kind of section is valid. */
10005 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10006 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10007 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10008 This is for DWP version 1 files. */
10010 static struct dwo_unit *
10011 create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file,
10012 uint32_t unit_index,
10013 const char *comp_dir,
10014 ULONGEST signature, int is_debug_types)
10016 struct objfile *objfile = dwarf2_per_objfile->objfile;
10017 const struct dwp_hash_table *dwp_htab =
10018 is_debug_types ? dwp_file->tus : dwp_file->cus;
10019 bfd *dbfd = dwp_file->dbfd;
10020 const char *kind = is_debug_types ? "TU" : "CU";
10021 struct dwo_file *dwo_file;
10022 struct dwo_unit *dwo_unit;
10023 struct virtual_v1_dwo_sections sections;
10024 void **dwo_file_slot;
10025 char *virtual_dwo_name;
10026 struct cleanup *cleanups;
10029 gdb_assert (dwp_file->version == 1);
10031 if (dwarf_read_debug)
10033 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
10035 pulongest (unit_index), hex_string (signature),
10039 /* Fetch the sections of this DWO unit.
10040 Put a limit on the number of sections we look for so that bad data
10041 doesn't cause us to loop forever. */
10043 #define MAX_NR_V1_DWO_SECTIONS \
10044 (1 /* .debug_info or .debug_types */ \
10045 + 1 /* .debug_abbrev */ \
10046 + 1 /* .debug_line */ \
10047 + 1 /* .debug_loc */ \
10048 + 1 /* .debug_str_offsets */ \
10049 + 1 /* .debug_macro or .debug_macinfo */ \
10050 + 1 /* trailing zero */)
10052 memset (§ions, 0, sizeof (sections));
10053 cleanups = make_cleanup (null_cleanup, 0);
10055 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
10058 uint32_t section_nr =
10059 read_4_bytes (dbfd,
10060 dwp_htab->section_pool.v1.indices
10061 + (unit_index + i) * sizeof (uint32_t));
10063 if (section_nr == 0)
10065 if (section_nr >= dwp_file->num_sections)
10067 error (_("Dwarf Error: bad DWP hash table, section number too large"
10068 " [in module %s]"),
10072 sectp = dwp_file->elf_sections[section_nr];
10073 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
10075 error (_("Dwarf Error: bad DWP hash table, invalid section found"
10076 " [in module %s]"),
10082 || dwarf2_section_empty_p (§ions.info_or_types)
10083 || dwarf2_section_empty_p (§ions.abbrev))
10085 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
10086 " [in module %s]"),
10089 if (i == MAX_NR_V1_DWO_SECTIONS)
10091 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
10092 " [in module %s]"),
10096 /* It's easier for the rest of the code if we fake a struct dwo_file and
10097 have dwo_unit "live" in that. At least for now.
10099 The DWP file can be made up of a random collection of CUs and TUs.
10100 However, for each CU + set of TUs that came from the same original DWO
10101 file, we can combine them back into a virtual DWO file to save space
10102 (fewer struct dwo_file objects to allocate). Remember that for really
10103 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10106 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
10107 get_section_id (§ions.abbrev),
10108 get_section_id (§ions.line),
10109 get_section_id (§ions.loc),
10110 get_section_id (§ions.str_offsets));
10111 make_cleanup (xfree, virtual_dwo_name);
10112 /* Can we use an existing virtual DWO file? */
10113 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10114 /* Create one if necessary. */
10115 if (*dwo_file_slot == NULL)
10117 if (dwarf_read_debug)
10119 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10122 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10124 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10126 strlen (virtual_dwo_name));
10127 dwo_file->comp_dir = comp_dir;
10128 dwo_file->sections.abbrev = sections.abbrev;
10129 dwo_file->sections.line = sections.line;
10130 dwo_file->sections.loc = sections.loc;
10131 dwo_file->sections.macinfo = sections.macinfo;
10132 dwo_file->sections.macro = sections.macro;
10133 dwo_file->sections.str_offsets = sections.str_offsets;
10134 /* The "str" section is global to the entire DWP file. */
10135 dwo_file->sections.str = dwp_file->sections.str;
10136 /* The info or types section is assigned below to dwo_unit,
10137 there's no need to record it in dwo_file.
10138 Also, we can't simply record type sections in dwo_file because
10139 we record a pointer into the vector in dwo_unit. As we collect more
10140 types we'll grow the vector and eventually have to reallocate space
10141 for it, invalidating all copies of pointers into the previous
10143 *dwo_file_slot = dwo_file;
10147 if (dwarf_read_debug)
10149 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10152 dwo_file = (struct dwo_file *) *dwo_file_slot;
10154 do_cleanups (cleanups);
10156 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10157 dwo_unit->dwo_file = dwo_file;
10158 dwo_unit->signature = signature;
10159 dwo_unit->section =
10160 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10161 *dwo_unit->section = sections.info_or_types;
10162 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10167 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
10168 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
10169 piece within that section used by a TU/CU, return a virtual section
10170 of just that piece. */
10172 static struct dwarf2_section_info
10173 create_dwp_v2_section (struct dwarf2_section_info *section,
10174 bfd_size_type offset, bfd_size_type size)
10176 struct dwarf2_section_info result;
10179 gdb_assert (section != NULL);
10180 gdb_assert (!section->is_virtual);
10182 memset (&result, 0, sizeof (result));
10183 result.s.containing_section = section;
10184 result.is_virtual = 1;
10189 sectp = get_section_bfd_section (section);
10191 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
10192 bounds of the real section. This is a pretty-rare event, so just
10193 flag an error (easier) instead of a warning and trying to cope. */
10195 || offset + size > bfd_get_section_size (sectp))
10197 bfd *abfd = sectp->owner;
10199 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
10200 " in section %s [in module %s]"),
10201 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
10202 objfile_name (dwarf2_per_objfile->objfile));
10205 result.virtual_offset = offset;
10206 result.size = size;
10210 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10211 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10212 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10213 This is for DWP version 2 files. */
10215 static struct dwo_unit *
10216 create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file,
10217 uint32_t unit_index,
10218 const char *comp_dir,
10219 ULONGEST signature, int is_debug_types)
10221 struct objfile *objfile = dwarf2_per_objfile->objfile;
10222 const struct dwp_hash_table *dwp_htab =
10223 is_debug_types ? dwp_file->tus : dwp_file->cus;
10224 bfd *dbfd = dwp_file->dbfd;
10225 const char *kind = is_debug_types ? "TU" : "CU";
10226 struct dwo_file *dwo_file;
10227 struct dwo_unit *dwo_unit;
10228 struct virtual_v2_dwo_sections sections;
10229 void **dwo_file_slot;
10230 char *virtual_dwo_name;
10231 struct cleanup *cleanups;
10234 gdb_assert (dwp_file->version == 2);
10236 if (dwarf_read_debug)
10238 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
10240 pulongest (unit_index), hex_string (signature),
10244 /* Fetch the section offsets of this DWO unit. */
10246 memset (§ions, 0, sizeof (sections));
10247 cleanups = make_cleanup (null_cleanup, 0);
10249 for (i = 0; i < dwp_htab->nr_columns; ++i)
10251 uint32_t offset = read_4_bytes (dbfd,
10252 dwp_htab->section_pool.v2.offsets
10253 + (((unit_index - 1) * dwp_htab->nr_columns
10255 * sizeof (uint32_t)));
10256 uint32_t size = read_4_bytes (dbfd,
10257 dwp_htab->section_pool.v2.sizes
10258 + (((unit_index - 1) * dwp_htab->nr_columns
10260 * sizeof (uint32_t)));
10262 switch (dwp_htab->section_pool.v2.section_ids[i])
10265 case DW_SECT_TYPES:
10266 sections.info_or_types_offset = offset;
10267 sections.info_or_types_size = size;
10269 case DW_SECT_ABBREV:
10270 sections.abbrev_offset = offset;
10271 sections.abbrev_size = size;
10274 sections.line_offset = offset;
10275 sections.line_size = size;
10278 sections.loc_offset = offset;
10279 sections.loc_size = size;
10281 case DW_SECT_STR_OFFSETS:
10282 sections.str_offsets_offset = offset;
10283 sections.str_offsets_size = size;
10285 case DW_SECT_MACINFO:
10286 sections.macinfo_offset = offset;
10287 sections.macinfo_size = size;
10289 case DW_SECT_MACRO:
10290 sections.macro_offset = offset;
10291 sections.macro_size = size;
10296 /* It's easier for the rest of the code if we fake a struct dwo_file and
10297 have dwo_unit "live" in that. At least for now.
10299 The DWP file can be made up of a random collection of CUs and TUs.
10300 However, for each CU + set of TUs that came from the same original DWO
10301 file, we can combine them back into a virtual DWO file to save space
10302 (fewer struct dwo_file objects to allocate). Remember that for really
10303 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10306 xstrprintf ("virtual-dwo/%ld-%ld-%ld-%ld",
10307 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
10308 (long) (sections.line_size ? sections.line_offset : 0),
10309 (long) (sections.loc_size ? sections.loc_offset : 0),
10310 (long) (sections.str_offsets_size
10311 ? sections.str_offsets_offset : 0));
10312 make_cleanup (xfree, virtual_dwo_name);
10313 /* Can we use an existing virtual DWO file? */
10314 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10315 /* Create one if necessary. */
10316 if (*dwo_file_slot == NULL)
10318 if (dwarf_read_debug)
10320 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10323 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10325 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10327 strlen (virtual_dwo_name));
10328 dwo_file->comp_dir = comp_dir;
10329 dwo_file->sections.abbrev =
10330 create_dwp_v2_section (&dwp_file->sections.abbrev,
10331 sections.abbrev_offset, sections.abbrev_size);
10332 dwo_file->sections.line =
10333 create_dwp_v2_section (&dwp_file->sections.line,
10334 sections.line_offset, sections.line_size);
10335 dwo_file->sections.loc =
10336 create_dwp_v2_section (&dwp_file->sections.loc,
10337 sections.loc_offset, sections.loc_size);
10338 dwo_file->sections.macinfo =
10339 create_dwp_v2_section (&dwp_file->sections.macinfo,
10340 sections.macinfo_offset, sections.macinfo_size);
10341 dwo_file->sections.macro =
10342 create_dwp_v2_section (&dwp_file->sections.macro,
10343 sections.macro_offset, sections.macro_size);
10344 dwo_file->sections.str_offsets =
10345 create_dwp_v2_section (&dwp_file->sections.str_offsets,
10346 sections.str_offsets_offset,
10347 sections.str_offsets_size);
10348 /* The "str" section is global to the entire DWP file. */
10349 dwo_file->sections.str = dwp_file->sections.str;
10350 /* The info or types section is assigned below to dwo_unit,
10351 there's no need to record it in dwo_file.
10352 Also, we can't simply record type sections in dwo_file because
10353 we record a pointer into the vector in dwo_unit. As we collect more
10354 types we'll grow the vector and eventually have to reallocate space
10355 for it, invalidating all copies of pointers into the previous
10357 *dwo_file_slot = dwo_file;
10361 if (dwarf_read_debug)
10363 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10366 dwo_file = (struct dwo_file *) *dwo_file_slot;
10368 do_cleanups (cleanups);
10370 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10371 dwo_unit->dwo_file = dwo_file;
10372 dwo_unit->signature = signature;
10373 dwo_unit->section =
10374 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10375 *dwo_unit->section = create_dwp_v2_section (is_debug_types
10376 ? &dwp_file->sections.types
10377 : &dwp_file->sections.info,
10378 sections.info_or_types_offset,
10379 sections.info_or_types_size);
10380 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10385 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
10386 Returns NULL if the signature isn't found. */
10388 static struct dwo_unit *
10389 lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir,
10390 ULONGEST signature, int is_debug_types)
10392 const struct dwp_hash_table *dwp_htab =
10393 is_debug_types ? dwp_file->tus : dwp_file->cus;
10394 bfd *dbfd = dwp_file->dbfd;
10395 uint32_t mask = dwp_htab->nr_slots - 1;
10396 uint32_t hash = signature & mask;
10397 uint32_t hash2 = ((signature >> 32) & mask) | 1;
10400 struct dwo_unit find_dwo_cu;
10402 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
10403 find_dwo_cu.signature = signature;
10404 slot = htab_find_slot (is_debug_types
10405 ? dwp_file->loaded_tus
10406 : dwp_file->loaded_cus,
10407 &find_dwo_cu, INSERT);
10410 return (struct dwo_unit *) *slot;
10412 /* Use a for loop so that we don't loop forever on bad debug info. */
10413 for (i = 0; i < dwp_htab->nr_slots; ++i)
10415 ULONGEST signature_in_table;
10417 signature_in_table =
10418 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
10419 if (signature_in_table == signature)
10421 uint32_t unit_index =
10422 read_4_bytes (dbfd,
10423 dwp_htab->unit_table + hash * sizeof (uint32_t));
10425 if (dwp_file->version == 1)
10427 *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index,
10428 comp_dir, signature,
10433 *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index,
10434 comp_dir, signature,
10437 return (struct dwo_unit *) *slot;
10439 if (signature_in_table == 0)
10441 hash = (hash + hash2) & mask;
10444 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
10445 " [in module %s]"),
10449 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
10450 Open the file specified by FILE_NAME and hand it off to BFD for
10451 preliminary analysis. Return a newly initialized bfd *, which
10452 includes a canonicalized copy of FILE_NAME.
10453 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
10454 SEARCH_CWD is true if the current directory is to be searched.
10455 It will be searched before debug-file-directory.
10456 If successful, the file is added to the bfd include table of the
10457 objfile's bfd (see gdb_bfd_record_inclusion).
10458 If unable to find/open the file, return NULL.
10459 NOTE: This function is derived from symfile_bfd_open. */
10462 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
10466 char *absolute_name;
10467 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
10468 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
10469 to debug_file_directory. */
10471 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
10475 if (*debug_file_directory != '\0')
10476 search_path = concat (".", dirname_separator_string,
10477 debug_file_directory, (char *) NULL);
10479 search_path = xstrdup (".");
10482 search_path = xstrdup (debug_file_directory);
10484 flags = OPF_RETURN_REALPATH;
10486 flags |= OPF_SEARCH_IN_PATH;
10487 desc = openp (search_path, flags, file_name,
10488 O_RDONLY | O_BINARY, &absolute_name);
10489 xfree (search_path);
10493 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc);
10494 xfree (absolute_name);
10495 if (sym_bfd == NULL)
10497 bfd_set_cacheable (sym_bfd, 1);
10499 if (!bfd_check_format (sym_bfd, bfd_object))
10501 gdb_bfd_unref (sym_bfd); /* This also closes desc. */
10505 /* Success. Record the bfd as having been included by the objfile's bfd.
10506 This is important because things like demangled_names_hash lives in the
10507 objfile's per_bfd space and may have references to things like symbol
10508 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
10509 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd);
10514 /* Try to open DWO file FILE_NAME.
10515 COMP_DIR is the DW_AT_comp_dir attribute.
10516 The result is the bfd handle of the file.
10517 If there is a problem finding or opening the file, return NULL.
10518 Upon success, the canonicalized path of the file is stored in the bfd,
10519 same as symfile_bfd_open. */
10522 open_dwo_file (const char *file_name, const char *comp_dir)
10526 if (IS_ABSOLUTE_PATH (file_name))
10527 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
10529 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
10531 if (comp_dir != NULL)
10533 char *path_to_try = concat (comp_dir, SLASH_STRING,
10534 file_name, (char *) NULL);
10536 /* NOTE: If comp_dir is a relative path, this will also try the
10537 search path, which seems useful. */
10538 abfd = try_open_dwop_file (path_to_try, 0 /*is_dwp*/, 1 /*search_cwd*/);
10539 xfree (path_to_try);
10544 /* That didn't work, try debug-file-directory, which, despite its name,
10545 is a list of paths. */
10547 if (*debug_file_directory == '\0')
10550 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
10553 /* This function is mapped across the sections and remembers the offset and
10554 size of each of the DWO debugging sections we are interested in. */
10557 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
10559 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
10560 const struct dwop_section_names *names = &dwop_section_names;
10562 if (section_is_p (sectp->name, &names->abbrev_dwo))
10564 dwo_sections->abbrev.s.section = sectp;
10565 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
10567 else if (section_is_p (sectp->name, &names->info_dwo))
10569 dwo_sections->info.s.section = sectp;
10570 dwo_sections->info.size = bfd_get_section_size (sectp);
10572 else if (section_is_p (sectp->name, &names->line_dwo))
10574 dwo_sections->line.s.section = sectp;
10575 dwo_sections->line.size = bfd_get_section_size (sectp);
10577 else if (section_is_p (sectp->name, &names->loc_dwo))
10579 dwo_sections->loc.s.section = sectp;
10580 dwo_sections->loc.size = bfd_get_section_size (sectp);
10582 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10584 dwo_sections->macinfo.s.section = sectp;
10585 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
10587 else if (section_is_p (sectp->name, &names->macro_dwo))
10589 dwo_sections->macro.s.section = sectp;
10590 dwo_sections->macro.size = bfd_get_section_size (sectp);
10592 else if (section_is_p (sectp->name, &names->str_dwo))
10594 dwo_sections->str.s.section = sectp;
10595 dwo_sections->str.size = bfd_get_section_size (sectp);
10597 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10599 dwo_sections->str_offsets.s.section = sectp;
10600 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
10602 else if (section_is_p (sectp->name, &names->types_dwo))
10604 struct dwarf2_section_info type_section;
10606 memset (&type_section, 0, sizeof (type_section));
10607 type_section.s.section = sectp;
10608 type_section.size = bfd_get_section_size (sectp);
10609 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
10614 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
10615 by PER_CU. This is for the non-DWP case.
10616 The result is NULL if DWO_NAME can't be found. */
10618 static struct dwo_file *
10619 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
10620 const char *dwo_name, const char *comp_dir)
10622 struct objfile *objfile = dwarf2_per_objfile->objfile;
10623 struct dwo_file *dwo_file;
10625 struct cleanup *cleanups;
10627 dbfd = open_dwo_file (dwo_name, comp_dir);
10630 if (dwarf_read_debug)
10631 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
10634 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10635 dwo_file->dwo_name = dwo_name;
10636 dwo_file->comp_dir = comp_dir;
10637 dwo_file->dbfd = dbfd;
10639 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
10641 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections);
10643 dwo_file->cu = create_dwo_cu (dwo_file);
10645 dwo_file->tus = create_debug_types_hash_table (dwo_file,
10646 dwo_file->sections.types);
10648 discard_cleanups (cleanups);
10650 if (dwarf_read_debug)
10651 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
10656 /* This function is mapped across the sections and remembers the offset and
10657 size of each of the DWP debugging sections common to version 1 and 2 that
10658 we are interested in. */
10661 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
10662 void *dwp_file_ptr)
10664 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
10665 const struct dwop_section_names *names = &dwop_section_names;
10666 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10668 /* Record the ELF section number for later lookup: this is what the
10669 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10670 gdb_assert (elf_section_nr < dwp_file->num_sections);
10671 dwp_file->elf_sections[elf_section_nr] = sectp;
10673 /* Look for specific sections that we need. */
10674 if (section_is_p (sectp->name, &names->str_dwo))
10676 dwp_file->sections.str.s.section = sectp;
10677 dwp_file->sections.str.size = bfd_get_section_size (sectp);
10679 else if (section_is_p (sectp->name, &names->cu_index))
10681 dwp_file->sections.cu_index.s.section = sectp;
10682 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
10684 else if (section_is_p (sectp->name, &names->tu_index))
10686 dwp_file->sections.tu_index.s.section = sectp;
10687 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
10691 /* This function is mapped across the sections and remembers the offset and
10692 size of each of the DWP version 2 debugging sections that we are interested
10693 in. This is split into a separate function because we don't know if we
10694 have version 1 or 2 until we parse the cu_index/tu_index sections. */
10697 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
10699 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
10700 const struct dwop_section_names *names = &dwop_section_names;
10701 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10703 /* Record the ELF section number for later lookup: this is what the
10704 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10705 gdb_assert (elf_section_nr < dwp_file->num_sections);
10706 dwp_file->elf_sections[elf_section_nr] = sectp;
10708 /* Look for specific sections that we need. */
10709 if (section_is_p (sectp->name, &names->abbrev_dwo))
10711 dwp_file->sections.abbrev.s.section = sectp;
10712 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
10714 else if (section_is_p (sectp->name, &names->info_dwo))
10716 dwp_file->sections.info.s.section = sectp;
10717 dwp_file->sections.info.size = bfd_get_section_size (sectp);
10719 else if (section_is_p (sectp->name, &names->line_dwo))
10721 dwp_file->sections.line.s.section = sectp;
10722 dwp_file->sections.line.size = bfd_get_section_size (sectp);
10724 else if (section_is_p (sectp->name, &names->loc_dwo))
10726 dwp_file->sections.loc.s.section = sectp;
10727 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
10729 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10731 dwp_file->sections.macinfo.s.section = sectp;
10732 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
10734 else if (section_is_p (sectp->name, &names->macro_dwo))
10736 dwp_file->sections.macro.s.section = sectp;
10737 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
10739 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10741 dwp_file->sections.str_offsets.s.section = sectp;
10742 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
10744 else if (section_is_p (sectp->name, &names->types_dwo))
10746 dwp_file->sections.types.s.section = sectp;
10747 dwp_file->sections.types.size = bfd_get_section_size (sectp);
10751 /* Hash function for dwp_file loaded CUs/TUs. */
10754 hash_dwp_loaded_cutus (const void *item)
10756 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
10758 /* This drops the top 32 bits of the signature, but is ok for a hash. */
10759 return dwo_unit->signature;
10762 /* Equality function for dwp_file loaded CUs/TUs. */
10765 eq_dwp_loaded_cutus (const void *a, const void *b)
10767 const struct dwo_unit *dua = (const struct dwo_unit *) a;
10768 const struct dwo_unit *dub = (const struct dwo_unit *) b;
10770 return dua->signature == dub->signature;
10773 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
10776 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
10778 return htab_create_alloc_ex (3,
10779 hash_dwp_loaded_cutus,
10780 eq_dwp_loaded_cutus,
10782 &objfile->objfile_obstack,
10783 hashtab_obstack_allocate,
10784 dummy_obstack_deallocate);
10787 /* Try to open DWP file FILE_NAME.
10788 The result is the bfd handle of the file.
10789 If there is a problem finding or opening the file, return NULL.
10790 Upon success, the canonicalized path of the file is stored in the bfd,
10791 same as symfile_bfd_open. */
10794 open_dwp_file (const char *file_name)
10798 abfd = try_open_dwop_file (file_name, 1 /*is_dwp*/, 1 /*search_cwd*/);
10802 /* Work around upstream bug 15652.
10803 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
10804 [Whether that's a "bug" is debatable, but it is getting in our way.]
10805 We have no real idea where the dwp file is, because gdb's realpath-ing
10806 of the executable's path may have discarded the needed info.
10807 [IWBN if the dwp file name was recorded in the executable, akin to
10808 .gnu_debuglink, but that doesn't exist yet.]
10809 Strip the directory from FILE_NAME and search again. */
10810 if (*debug_file_directory != '\0')
10812 /* Don't implicitly search the current directory here.
10813 If the user wants to search "." to handle this case,
10814 it must be added to debug-file-directory. */
10815 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
10822 /* Initialize the use of the DWP file for the current objfile.
10823 By convention the name of the DWP file is ${objfile}.dwp.
10824 The result is NULL if it can't be found. */
10826 static struct dwp_file *
10827 open_and_init_dwp_file (void)
10829 struct objfile *objfile = dwarf2_per_objfile->objfile;
10830 struct dwp_file *dwp_file;
10833 struct cleanup *cleanups = make_cleanup (null_cleanup, 0);
10835 /* Try to find first .dwp for the binary file before any symbolic links
10838 /* If the objfile is a debug file, find the name of the real binary
10839 file and get the name of dwp file from there. */
10840 if (objfile->separate_debug_objfile_backlink != NULL)
10842 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
10843 const char *backlink_basename = lbasename (backlink->original_name);
10844 char *debug_dirname = ldirname (objfile->original_name);
10846 make_cleanup (xfree, debug_dirname);
10847 dwp_name = xstrprintf ("%s%s%s.dwp", debug_dirname,
10848 SLASH_STRING, backlink_basename);
10851 dwp_name = xstrprintf ("%s.dwp", objfile->original_name);
10852 make_cleanup (xfree, dwp_name);
10854 dbfd = open_dwp_file (dwp_name);
10856 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
10858 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
10859 dwp_name = xstrprintf ("%s.dwp", objfile_name (objfile));
10860 make_cleanup (xfree, dwp_name);
10861 dbfd = open_dwp_file (dwp_name);
10866 if (dwarf_read_debug)
10867 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name);
10868 do_cleanups (cleanups);
10871 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
10872 dwp_file->name = bfd_get_filename (dbfd);
10873 dwp_file->dbfd = dbfd;
10874 do_cleanups (cleanups);
10876 /* +1: section 0 is unused */
10877 dwp_file->num_sections = bfd_count_sections (dbfd) + 1;
10878 dwp_file->elf_sections =
10879 OBSTACK_CALLOC (&objfile->objfile_obstack,
10880 dwp_file->num_sections, asection *);
10882 bfd_map_over_sections (dbfd, dwarf2_locate_common_dwp_sections, dwp_file);
10884 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
10886 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
10888 /* The DWP file version is stored in the hash table. Oh well. */
10889 if (dwp_file->cus->version != dwp_file->tus->version)
10891 /* Technically speaking, we should try to limp along, but this is
10892 pretty bizarre. We use pulongest here because that's the established
10893 portability solution (e.g, we cannot use %u for uint32_t). */
10894 error (_("Dwarf Error: DWP file CU version %s doesn't match"
10895 " TU version %s [in DWP file %s]"),
10896 pulongest (dwp_file->cus->version),
10897 pulongest (dwp_file->tus->version), dwp_name);
10899 dwp_file->version = dwp_file->cus->version;
10901 if (dwp_file->version == 2)
10902 bfd_map_over_sections (dbfd, dwarf2_locate_v2_dwp_sections, dwp_file);
10904 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
10905 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
10907 if (dwarf_read_debug)
10909 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
10910 fprintf_unfiltered (gdb_stdlog,
10911 " %s CUs, %s TUs\n",
10912 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
10913 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
10919 /* Wrapper around open_and_init_dwp_file, only open it once. */
10921 static struct dwp_file *
10922 get_dwp_file (void)
10924 if (! dwarf2_per_objfile->dwp_checked)
10926 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
10927 dwarf2_per_objfile->dwp_checked = 1;
10929 return dwarf2_per_objfile->dwp_file;
10932 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
10933 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
10934 or in the DWP file for the objfile, referenced by THIS_UNIT.
10935 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
10936 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
10938 This is called, for example, when wanting to read a variable with a
10939 complex location. Therefore we don't want to do file i/o for every call.
10940 Therefore we don't want to look for a DWO file on every call.
10941 Therefore we first see if we've already seen SIGNATURE in a DWP file,
10942 then we check if we've already seen DWO_NAME, and only THEN do we check
10945 The result is a pointer to the dwo_unit object or NULL if we didn't find it
10946 (dwo_id mismatch or couldn't find the DWO/DWP file). */
10948 static struct dwo_unit *
10949 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
10950 const char *dwo_name, const char *comp_dir,
10951 ULONGEST signature, int is_debug_types)
10953 struct objfile *objfile = dwarf2_per_objfile->objfile;
10954 const char *kind = is_debug_types ? "TU" : "CU";
10955 void **dwo_file_slot;
10956 struct dwo_file *dwo_file;
10957 struct dwp_file *dwp_file;
10959 /* First see if there's a DWP file.
10960 If we have a DWP file but didn't find the DWO inside it, don't
10961 look for the original DWO file. It makes gdb behave differently
10962 depending on whether one is debugging in the build tree. */
10964 dwp_file = get_dwp_file ();
10965 if (dwp_file != NULL)
10967 const struct dwp_hash_table *dwp_htab =
10968 is_debug_types ? dwp_file->tus : dwp_file->cus;
10970 if (dwp_htab != NULL)
10972 struct dwo_unit *dwo_cutu =
10973 lookup_dwo_unit_in_dwp (dwp_file, comp_dir,
10974 signature, is_debug_types);
10976 if (dwo_cutu != NULL)
10978 if (dwarf_read_debug)
10980 fprintf_unfiltered (gdb_stdlog,
10981 "Virtual DWO %s %s found: @%s\n",
10982 kind, hex_string (signature),
10983 host_address_to_string (dwo_cutu));
10991 /* No DWP file, look for the DWO file. */
10993 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
10994 if (*dwo_file_slot == NULL)
10996 /* Read in the file and build a table of the CUs/TUs it contains. */
10997 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
10999 /* NOTE: This will be NULL if unable to open the file. */
11000 dwo_file = (struct dwo_file *) *dwo_file_slot;
11002 if (dwo_file != NULL)
11004 struct dwo_unit *dwo_cutu = NULL;
11006 if (is_debug_types && dwo_file->tus)
11008 struct dwo_unit find_dwo_cutu;
11010 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11011 find_dwo_cutu.signature = signature;
11013 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
11015 else if (!is_debug_types && dwo_file->cu)
11017 if (signature == dwo_file->cu->signature)
11018 dwo_cutu = dwo_file->cu;
11021 if (dwo_cutu != NULL)
11023 if (dwarf_read_debug)
11025 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
11026 kind, dwo_name, hex_string (signature),
11027 host_address_to_string (dwo_cutu));
11034 /* We didn't find it. This could mean a dwo_id mismatch, or
11035 someone deleted the DWO/DWP file, or the search path isn't set up
11036 correctly to find the file. */
11038 if (dwarf_read_debug)
11040 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
11041 kind, dwo_name, hex_string (signature));
11044 /* This is a warning and not a complaint because it can be caused by
11045 pilot error (e.g., user accidentally deleting the DWO). */
11047 /* Print the name of the DWP file if we looked there, helps the user
11048 better diagnose the problem. */
11049 char *dwp_text = NULL;
11050 struct cleanup *cleanups;
11052 if (dwp_file != NULL)
11053 dwp_text = xstrprintf (" [in DWP file %s]", lbasename (dwp_file->name));
11054 cleanups = make_cleanup (xfree, dwp_text);
11056 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
11057 " [in module %s]"),
11058 kind, dwo_name, hex_string (signature),
11059 dwp_text != NULL ? dwp_text : "",
11060 this_unit->is_debug_types ? "TU" : "CU",
11061 this_unit->offset.sect_off, objfile_name (objfile));
11063 do_cleanups (cleanups);
11068 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
11069 See lookup_dwo_cutu_unit for details. */
11071 static struct dwo_unit *
11072 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
11073 const char *dwo_name, const char *comp_dir,
11074 ULONGEST signature)
11076 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
11079 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
11080 See lookup_dwo_cutu_unit for details. */
11082 static struct dwo_unit *
11083 lookup_dwo_type_unit (struct signatured_type *this_tu,
11084 const char *dwo_name, const char *comp_dir)
11086 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
11089 /* Traversal function for queue_and_load_all_dwo_tus. */
11092 queue_and_load_dwo_tu (void **slot, void *info)
11094 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
11095 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
11096 ULONGEST signature = dwo_unit->signature;
11097 struct signatured_type *sig_type =
11098 lookup_dwo_signatured_type (per_cu->cu, signature);
11100 if (sig_type != NULL)
11102 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
11104 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
11105 a real dependency of PER_CU on SIG_TYPE. That is detected later
11106 while processing PER_CU. */
11107 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
11108 load_full_type_unit (sig_cu);
11109 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
11115 /* Queue all TUs contained in the DWO of PER_CU to be read in.
11116 The DWO may have the only definition of the type, though it may not be
11117 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
11118 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
11121 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
11123 struct dwo_unit *dwo_unit;
11124 struct dwo_file *dwo_file;
11126 gdb_assert (!per_cu->is_debug_types);
11127 gdb_assert (get_dwp_file () == NULL);
11128 gdb_assert (per_cu->cu != NULL);
11130 dwo_unit = per_cu->cu->dwo_unit;
11131 gdb_assert (dwo_unit != NULL);
11133 dwo_file = dwo_unit->dwo_file;
11134 if (dwo_file->tus != NULL)
11135 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
11138 /* Free all resources associated with DWO_FILE.
11139 Close the DWO file and munmap the sections.
11140 All memory should be on the objfile obstack. */
11143 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
11146 /* Note: dbfd is NULL for virtual DWO files. */
11147 gdb_bfd_unref (dwo_file->dbfd);
11149 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
11152 /* Wrapper for free_dwo_file for use in cleanups. */
11155 free_dwo_file_cleanup (void *arg)
11157 struct dwo_file *dwo_file = (struct dwo_file *) arg;
11158 struct objfile *objfile = dwarf2_per_objfile->objfile;
11160 free_dwo_file (dwo_file, objfile);
11163 /* Traversal function for free_dwo_files. */
11166 free_dwo_file_from_slot (void **slot, void *info)
11168 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
11169 struct objfile *objfile = (struct objfile *) info;
11171 free_dwo_file (dwo_file, objfile);
11176 /* Free all resources associated with DWO_FILES. */
11179 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
11181 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
11184 /* Read in various DIEs. */
11186 /* qsort helper for inherit_abstract_dies. */
11189 unsigned_int_compar (const void *ap, const void *bp)
11191 unsigned int a = *(unsigned int *) ap;
11192 unsigned int b = *(unsigned int *) bp;
11194 return (a > b) - (b > a);
11197 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
11198 Inherit only the children of the DW_AT_abstract_origin DIE not being
11199 already referenced by DW_AT_abstract_origin from the children of the
11203 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
11205 struct die_info *child_die;
11206 unsigned die_children_count;
11207 /* CU offsets which were referenced by children of the current DIE. */
11208 sect_offset *offsets;
11209 sect_offset *offsets_end, *offsetp;
11210 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
11211 struct die_info *origin_die;
11212 /* Iterator of the ORIGIN_DIE children. */
11213 struct die_info *origin_child_die;
11214 struct cleanup *cleanups;
11215 struct attribute *attr;
11216 struct dwarf2_cu *origin_cu;
11217 struct pending **origin_previous_list_in_scope;
11219 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
11223 /* Note that following die references may follow to a die in a
11227 origin_die = follow_die_ref (die, attr, &origin_cu);
11229 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
11231 origin_previous_list_in_scope = origin_cu->list_in_scope;
11232 origin_cu->list_in_scope = cu->list_in_scope;
11234 if (die->tag != origin_die->tag
11235 && !(die->tag == DW_TAG_inlined_subroutine
11236 && origin_die->tag == DW_TAG_subprogram))
11237 complaint (&symfile_complaints,
11238 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
11239 die->offset.sect_off, origin_die->offset.sect_off);
11241 child_die = die->child;
11242 die_children_count = 0;
11243 while (child_die && child_die->tag)
11245 child_die = sibling_die (child_die);
11246 die_children_count++;
11248 offsets = XNEWVEC (sect_offset, die_children_count);
11249 cleanups = make_cleanup (xfree, offsets);
11251 offsets_end = offsets;
11252 for (child_die = die->child;
11253 child_die && child_die->tag;
11254 child_die = sibling_die (child_die))
11256 struct die_info *child_origin_die;
11257 struct dwarf2_cu *child_origin_cu;
11259 /* We are trying to process concrete instance entries:
11260 DW_TAG_GNU_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
11261 it's not relevant to our analysis here. i.e. detecting DIEs that are
11262 present in the abstract instance but not referenced in the concrete
11264 if (child_die->tag == DW_TAG_GNU_call_site)
11267 /* For each CHILD_DIE, find the corresponding child of
11268 ORIGIN_DIE. If there is more than one layer of
11269 DW_AT_abstract_origin, follow them all; there shouldn't be,
11270 but GCC versions at least through 4.4 generate this (GCC PR
11272 child_origin_die = child_die;
11273 child_origin_cu = cu;
11276 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
11280 child_origin_die = follow_die_ref (child_origin_die, attr,
11284 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
11285 counterpart may exist. */
11286 if (child_origin_die != child_die)
11288 if (child_die->tag != child_origin_die->tag
11289 && !(child_die->tag == DW_TAG_inlined_subroutine
11290 && child_origin_die->tag == DW_TAG_subprogram))
11291 complaint (&symfile_complaints,
11292 _("Child DIE 0x%x and its abstract origin 0x%x have "
11293 "different tags"), child_die->offset.sect_off,
11294 child_origin_die->offset.sect_off);
11295 if (child_origin_die->parent != origin_die)
11296 complaint (&symfile_complaints,
11297 _("Child DIE 0x%x and its abstract origin 0x%x have "
11298 "different parents"), child_die->offset.sect_off,
11299 child_origin_die->offset.sect_off);
11301 *offsets_end++ = child_origin_die->offset;
11304 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
11305 unsigned_int_compar);
11306 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
11307 if (offsetp[-1].sect_off == offsetp->sect_off)
11308 complaint (&symfile_complaints,
11309 _("Multiple children of DIE 0x%x refer "
11310 "to DIE 0x%x as their abstract origin"),
11311 die->offset.sect_off, offsetp->sect_off);
11314 origin_child_die = origin_die->child;
11315 while (origin_child_die && origin_child_die->tag)
11317 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
11318 while (offsetp < offsets_end
11319 && offsetp->sect_off < origin_child_die->offset.sect_off)
11321 if (offsetp >= offsets_end
11322 || offsetp->sect_off > origin_child_die->offset.sect_off)
11324 /* Found that ORIGIN_CHILD_DIE is really not referenced.
11325 Check whether we're already processing ORIGIN_CHILD_DIE.
11326 This can happen with mutually referenced abstract_origins.
11328 if (!origin_child_die->in_process)
11329 process_die (origin_child_die, origin_cu);
11331 origin_child_die = sibling_die (origin_child_die);
11333 origin_cu->list_in_scope = origin_previous_list_in_scope;
11335 do_cleanups (cleanups);
11339 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
11341 struct objfile *objfile = cu->objfile;
11342 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11343 struct context_stack *newobj;
11346 struct die_info *child_die;
11347 struct attribute *attr, *call_line, *call_file;
11349 CORE_ADDR baseaddr;
11350 struct block *block;
11351 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
11352 VEC (symbolp) *template_args = NULL;
11353 struct template_symbol *templ_func = NULL;
11357 /* If we do not have call site information, we can't show the
11358 caller of this inlined function. That's too confusing, so
11359 only use the scope for local variables. */
11360 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
11361 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
11362 if (call_line == NULL || call_file == NULL)
11364 read_lexical_block_scope (die, cu);
11369 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11371 name = dwarf2_name (die, cu);
11373 /* Ignore functions with missing or empty names. These are actually
11374 illegal according to the DWARF standard. */
11377 complaint (&symfile_complaints,
11378 _("missing name for subprogram DIE at %d"),
11379 die->offset.sect_off);
11383 /* Ignore functions with missing or invalid low and high pc attributes. */
11384 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
11385 <= PC_BOUNDS_INVALID)
11387 attr = dwarf2_attr (die, DW_AT_external, cu);
11388 if (!attr || !DW_UNSND (attr))
11389 complaint (&symfile_complaints,
11390 _("cannot get low and high bounds "
11391 "for subprogram DIE at %d"),
11392 die->offset.sect_off);
11396 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11397 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11399 /* If we have any template arguments, then we must allocate a
11400 different sort of symbol. */
11401 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
11403 if (child_die->tag == DW_TAG_template_type_param
11404 || child_die->tag == DW_TAG_template_value_param)
11406 templ_func = allocate_template_symbol (objfile);
11407 templ_func->base.is_cplus_template_function = 1;
11412 newobj = push_context (0, lowpc);
11413 newobj->name = new_symbol_full (die, read_type_die (die, cu), cu,
11414 (struct symbol *) templ_func);
11416 /* If there is a location expression for DW_AT_frame_base, record
11418 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
11420 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
11422 /* If there is a location for the static link, record it. */
11423 newobj->static_link = NULL;
11424 attr = dwarf2_attr (die, DW_AT_static_link, cu);
11427 newobj->static_link
11428 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
11429 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
11432 cu->list_in_scope = &local_symbols;
11434 if (die->child != NULL)
11436 child_die = die->child;
11437 while (child_die && child_die->tag)
11439 if (child_die->tag == DW_TAG_template_type_param
11440 || child_die->tag == DW_TAG_template_value_param)
11442 struct symbol *arg = new_symbol (child_die, NULL, cu);
11445 VEC_safe_push (symbolp, template_args, arg);
11448 process_die (child_die, cu);
11449 child_die = sibling_die (child_die);
11453 inherit_abstract_dies (die, cu);
11455 /* If we have a DW_AT_specification, we might need to import using
11456 directives from the context of the specification DIE. See the
11457 comment in determine_prefix. */
11458 if (cu->language == language_cplus
11459 && dwarf2_attr (die, DW_AT_specification, cu))
11461 struct dwarf2_cu *spec_cu = cu;
11462 struct die_info *spec_die = die_specification (die, &spec_cu);
11466 child_die = spec_die->child;
11467 while (child_die && child_die->tag)
11469 if (child_die->tag == DW_TAG_imported_module)
11470 process_die (child_die, spec_cu);
11471 child_die = sibling_die (child_die);
11474 /* In some cases, GCC generates specification DIEs that
11475 themselves contain DW_AT_specification attributes. */
11476 spec_die = die_specification (spec_die, &spec_cu);
11480 newobj = pop_context ();
11481 /* Make a block for the local symbols within. */
11482 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
11483 newobj->static_link, lowpc, highpc);
11485 /* For C++, set the block's scope. */
11486 if ((cu->language == language_cplus
11487 || cu->language == language_fortran
11488 || cu->language == language_d
11489 || cu->language == language_rust)
11490 && cu->processing_has_namespace_info)
11491 block_set_scope (block, determine_prefix (die, cu),
11492 &objfile->objfile_obstack);
11494 /* If we have address ranges, record them. */
11495 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11497 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
11499 /* Attach template arguments to function. */
11500 if (! VEC_empty (symbolp, template_args))
11502 gdb_assert (templ_func != NULL);
11504 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
11505 templ_func->template_arguments
11506 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
11507 templ_func->n_template_arguments);
11508 memcpy (templ_func->template_arguments,
11509 VEC_address (symbolp, template_args),
11510 (templ_func->n_template_arguments * sizeof (struct symbol *)));
11511 VEC_free (symbolp, template_args);
11514 /* In C++, we can have functions nested inside functions (e.g., when
11515 a function declares a class that has methods). This means that
11516 when we finish processing a function scope, we may need to go
11517 back to building a containing block's symbol lists. */
11518 local_symbols = newobj->locals;
11519 local_using_directives = newobj->local_using_directives;
11521 /* If we've finished processing a top-level function, subsequent
11522 symbols go in the file symbol list. */
11523 if (outermost_context_p ())
11524 cu->list_in_scope = &file_symbols;
11527 /* Process all the DIES contained within a lexical block scope. Start
11528 a new scope, process the dies, and then close the scope. */
11531 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
11533 struct objfile *objfile = cu->objfile;
11534 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11535 struct context_stack *newobj;
11536 CORE_ADDR lowpc, highpc;
11537 struct die_info *child_die;
11538 CORE_ADDR baseaddr;
11540 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11542 /* Ignore blocks with missing or invalid low and high pc attributes. */
11543 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
11544 as multiple lexical blocks? Handling children in a sane way would
11545 be nasty. Might be easier to properly extend generic blocks to
11546 describe ranges. */
11547 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
11549 case PC_BOUNDS_NOT_PRESENT:
11550 /* DW_TAG_lexical_block has no attributes, process its children as if
11551 there was no wrapping by that DW_TAG_lexical_block.
11552 GCC does no longer produces such DWARF since GCC r224161. */
11553 for (child_die = die->child;
11554 child_die != NULL && child_die->tag;
11555 child_die = sibling_die (child_die))
11556 process_die (child_die, cu);
11558 case PC_BOUNDS_INVALID:
11561 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11562 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11564 push_context (0, lowpc);
11565 if (die->child != NULL)
11567 child_die = die->child;
11568 while (child_die && child_die->tag)
11570 process_die (child_die, cu);
11571 child_die = sibling_die (child_die);
11574 inherit_abstract_dies (die, cu);
11575 newobj = pop_context ();
11577 if (local_symbols != NULL || local_using_directives != NULL)
11579 struct block *block
11580 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
11581 newobj->start_addr, highpc);
11583 /* Note that recording ranges after traversing children, as we
11584 do here, means that recording a parent's ranges entails
11585 walking across all its children's ranges as they appear in
11586 the address map, which is quadratic behavior.
11588 It would be nicer to record the parent's ranges before
11589 traversing its children, simply overriding whatever you find
11590 there. But since we don't even decide whether to create a
11591 block until after we've traversed its children, that's hard
11593 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11595 local_symbols = newobj->locals;
11596 local_using_directives = newobj->local_using_directives;
11599 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */
11602 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
11604 struct objfile *objfile = cu->objfile;
11605 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11606 CORE_ADDR pc, baseaddr;
11607 struct attribute *attr;
11608 struct call_site *call_site, call_site_local;
11611 struct die_info *child_die;
11613 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11615 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11618 complaint (&symfile_complaints,
11619 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site "
11620 "DIE 0x%x [in module %s]"),
11621 die->offset.sect_off, objfile_name (objfile));
11624 pc = attr_value_as_address (attr) + baseaddr;
11625 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
11627 if (cu->call_site_htab == NULL)
11628 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
11629 NULL, &objfile->objfile_obstack,
11630 hashtab_obstack_allocate, NULL);
11631 call_site_local.pc = pc;
11632 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
11635 complaint (&symfile_complaints,
11636 _("Duplicate PC %s for DW_TAG_GNU_call_site "
11637 "DIE 0x%x [in module %s]"),
11638 paddress (gdbarch, pc), die->offset.sect_off,
11639 objfile_name (objfile));
11643 /* Count parameters at the caller. */
11646 for (child_die = die->child; child_die && child_die->tag;
11647 child_die = sibling_die (child_die))
11649 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
11651 complaint (&symfile_complaints,
11652 _("Tag %d is not DW_TAG_GNU_call_site_parameter in "
11653 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11654 child_die->tag, child_die->offset.sect_off,
11655 objfile_name (objfile));
11663 = ((struct call_site *)
11664 obstack_alloc (&objfile->objfile_obstack,
11665 sizeof (*call_site)
11666 + (sizeof (*call_site->parameter) * (nparams - 1))));
11668 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
11669 call_site->pc = pc;
11671 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
11673 struct die_info *func_die;
11675 /* Skip also over DW_TAG_inlined_subroutine. */
11676 for (func_die = die->parent;
11677 func_die && func_die->tag != DW_TAG_subprogram
11678 && func_die->tag != DW_TAG_subroutine_type;
11679 func_die = func_die->parent);
11681 /* DW_AT_GNU_all_call_sites is a superset
11682 of DW_AT_GNU_all_tail_call_sites. */
11684 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
11685 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
11687 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
11688 not complete. But keep CALL_SITE for look ups via call_site_htab,
11689 both the initial caller containing the real return address PC and
11690 the final callee containing the current PC of a chain of tail
11691 calls do not need to have the tail call list complete. But any
11692 function candidate for a virtual tail call frame searched via
11693 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
11694 determined unambiguously. */
11698 struct type *func_type = NULL;
11701 func_type = get_die_type (func_die, cu);
11702 if (func_type != NULL)
11704 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
11706 /* Enlist this call site to the function. */
11707 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
11708 TYPE_TAIL_CALL_LIST (func_type) = call_site;
11711 complaint (&symfile_complaints,
11712 _("Cannot find function owning DW_TAG_GNU_call_site "
11713 "DIE 0x%x [in module %s]"),
11714 die->offset.sect_off, objfile_name (objfile));
11718 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
11720 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
11721 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
11722 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
11723 /* Keep NULL DWARF_BLOCK. */;
11724 else if (attr_form_is_block (attr))
11726 struct dwarf2_locexpr_baton *dlbaton;
11728 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
11729 dlbaton->data = DW_BLOCK (attr)->data;
11730 dlbaton->size = DW_BLOCK (attr)->size;
11731 dlbaton->per_cu = cu->per_cu;
11733 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
11735 else if (attr_form_is_ref (attr))
11737 struct dwarf2_cu *target_cu = cu;
11738 struct die_info *target_die;
11740 target_die = follow_die_ref (die, attr, &target_cu);
11741 gdb_assert (target_cu->objfile == objfile);
11742 if (die_is_declaration (target_die, target_cu))
11744 const char *target_physname;
11746 /* Prefer the mangled name; otherwise compute the demangled one. */
11747 target_physname = dwarf2_string_attr (target_die,
11748 DW_AT_linkage_name,
11750 if (target_physname == NULL)
11751 target_physname = dwarf2_string_attr (target_die,
11752 DW_AT_MIPS_linkage_name,
11754 if (target_physname == NULL)
11755 target_physname = dwarf2_physname (NULL, target_die, target_cu);
11756 if (target_physname == NULL)
11757 complaint (&symfile_complaints,
11758 _("DW_AT_GNU_call_site_target target DIE has invalid "
11759 "physname, for referencing DIE 0x%x [in module %s]"),
11760 die->offset.sect_off, objfile_name (objfile));
11762 SET_FIELD_PHYSNAME (call_site->target, target_physname);
11768 /* DW_AT_entry_pc should be preferred. */
11769 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
11770 <= PC_BOUNDS_INVALID)
11771 complaint (&symfile_complaints,
11772 _("DW_AT_GNU_call_site_target target DIE has invalid "
11773 "low pc, for referencing DIE 0x%x [in module %s]"),
11774 die->offset.sect_off, objfile_name (objfile));
11777 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11778 SET_FIELD_PHYSADDR (call_site->target, lowpc);
11783 complaint (&symfile_complaints,
11784 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither "
11785 "block nor reference, for DIE 0x%x [in module %s]"),
11786 die->offset.sect_off, objfile_name (objfile));
11788 call_site->per_cu = cu->per_cu;
11790 for (child_die = die->child;
11791 child_die && child_die->tag;
11792 child_die = sibling_die (child_die))
11794 struct call_site_parameter *parameter;
11795 struct attribute *loc, *origin;
11797 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
11799 /* Already printed the complaint above. */
11803 gdb_assert (call_site->parameter_count < nparams);
11804 parameter = &call_site->parameter[call_site->parameter_count];
11806 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
11807 specifies DW_TAG_formal_parameter. Value of the data assumed for the
11808 register is contained in DW_AT_GNU_call_site_value. */
11810 loc = dwarf2_attr (child_die, DW_AT_location, cu);
11811 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
11812 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
11814 sect_offset offset;
11816 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
11817 offset = dwarf2_get_ref_die_offset (origin);
11818 if (!offset_in_cu_p (&cu->header, offset))
11820 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
11821 binding can be done only inside one CU. Such referenced DIE
11822 therefore cannot be even moved to DW_TAG_partial_unit. */
11823 complaint (&symfile_complaints,
11824 _("DW_AT_abstract_origin offset is not in CU for "
11825 "DW_TAG_GNU_call_site child DIE 0x%x "
11827 child_die->offset.sect_off, objfile_name (objfile));
11830 parameter->u.param_offset.cu_off = (offset.sect_off
11831 - cu->header.offset.sect_off);
11833 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
11835 complaint (&symfile_complaints,
11836 _("No DW_FORM_block* DW_AT_location for "
11837 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11838 child_die->offset.sect_off, objfile_name (objfile));
11843 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
11844 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
11845 if (parameter->u.dwarf_reg != -1)
11846 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
11847 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
11848 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
11849 ¶meter->u.fb_offset))
11850 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
11853 complaint (&symfile_complaints,
11854 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
11855 "for DW_FORM_block* DW_AT_location is supported for "
11856 "DW_TAG_GNU_call_site child DIE 0x%x "
11858 child_die->offset.sect_off, objfile_name (objfile));
11863 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
11864 if (!attr_form_is_block (attr))
11866 complaint (&symfile_complaints,
11867 _("No DW_FORM_block* DW_AT_GNU_call_site_value for "
11868 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11869 child_die->offset.sect_off, objfile_name (objfile));
11872 parameter->value = DW_BLOCK (attr)->data;
11873 parameter->value_size = DW_BLOCK (attr)->size;
11875 /* Parameters are not pre-cleared by memset above. */
11876 parameter->data_value = NULL;
11877 parameter->data_value_size = 0;
11878 call_site->parameter_count++;
11880 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
11883 if (!attr_form_is_block (attr))
11884 complaint (&symfile_complaints,
11885 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for "
11886 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
11887 child_die->offset.sect_off, objfile_name (objfile));
11890 parameter->data_value = DW_BLOCK (attr)->data;
11891 parameter->data_value_size = DW_BLOCK (attr)->size;
11897 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
11898 Return 1 if the attributes are present and valid, otherwise, return 0.
11899 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
11902 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
11903 CORE_ADDR *high_return, struct dwarf2_cu *cu,
11904 struct partial_symtab *ranges_pst)
11906 struct objfile *objfile = cu->objfile;
11907 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11908 struct comp_unit_head *cu_header = &cu->header;
11909 bfd *obfd = objfile->obfd;
11910 unsigned int addr_size = cu_header->addr_size;
11911 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
11912 /* Base address selection entry. */
11915 unsigned int dummy;
11916 const gdb_byte *buffer;
11919 CORE_ADDR high = 0;
11920 CORE_ADDR baseaddr;
11922 found_base = cu->base_known;
11923 base = cu->base_address;
11925 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
11926 if (offset >= dwarf2_per_objfile->ranges.size)
11928 complaint (&symfile_complaints,
11929 _("Offset %d out of bounds for DW_AT_ranges attribute"),
11933 buffer = dwarf2_per_objfile->ranges.buffer + offset;
11937 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11941 CORE_ADDR range_beginning, range_end;
11943 range_beginning = read_address (obfd, buffer, cu, &dummy);
11944 buffer += addr_size;
11945 range_end = read_address (obfd, buffer, cu, &dummy);
11946 buffer += addr_size;
11947 offset += 2 * addr_size;
11949 /* An end of list marker is a pair of zero addresses. */
11950 if (range_beginning == 0 && range_end == 0)
11951 /* Found the end of list entry. */
11954 /* Each base address selection entry is a pair of 2 values.
11955 The first is the largest possible address, the second is
11956 the base address. Check for a base address here. */
11957 if ((range_beginning & mask) == mask)
11959 /* If we found the largest possible address, then we already
11960 have the base address in range_end. */
11968 /* We have no valid base address for the ranges
11970 complaint (&symfile_complaints,
11971 _("Invalid .debug_ranges data (no base address)"));
11975 if (range_beginning > range_end)
11977 /* Inverted range entries are invalid. */
11978 complaint (&symfile_complaints,
11979 _("Invalid .debug_ranges data (inverted range)"));
11983 /* Empty range entries have no effect. */
11984 if (range_beginning == range_end)
11987 range_beginning += base;
11990 /* A not-uncommon case of bad debug info.
11991 Don't pollute the addrmap with bad data. */
11992 if (range_beginning + baseaddr == 0
11993 && !dwarf2_per_objfile->has_section_at_zero)
11995 complaint (&symfile_complaints,
11996 _(".debug_ranges entry has start address of zero"
11997 " [in module %s]"), objfile_name (objfile));
12001 if (ranges_pst != NULL)
12006 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12007 range_beginning + baseaddr);
12008 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12009 range_end + baseaddr);
12010 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
12014 /* FIXME: This is recording everything as a low-high
12015 segment of consecutive addresses. We should have a
12016 data structure for discontiguous block ranges
12020 low = range_beginning;
12026 if (range_beginning < low)
12027 low = range_beginning;
12028 if (range_end > high)
12034 /* If the first entry is an end-of-list marker, the range
12035 describes an empty scope, i.e. no instructions. */
12041 *high_return = high;
12045 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
12046 definition for the return value. *LOWPC and *HIGHPC are set iff
12047 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
12049 static enum pc_bounds_kind
12050 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
12051 CORE_ADDR *highpc, struct dwarf2_cu *cu,
12052 struct partial_symtab *pst)
12054 struct attribute *attr;
12055 struct attribute *attr_high;
12057 CORE_ADDR high = 0;
12058 enum pc_bounds_kind ret;
12060 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12063 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12066 low = attr_value_as_address (attr);
12067 high = attr_value_as_address (attr_high);
12068 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12072 /* Found high w/o low attribute. */
12073 return PC_BOUNDS_INVALID;
12075 /* Found consecutive range of addresses. */
12076 ret = PC_BOUNDS_HIGH_LOW;
12080 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12083 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12084 We take advantage of the fact that DW_AT_ranges does not appear
12085 in DW_TAG_compile_unit of DWO files. */
12086 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12087 unsigned int ranges_offset = (DW_UNSND (attr)
12088 + (need_ranges_base
12092 /* Value of the DW_AT_ranges attribute is the offset in the
12093 .debug_ranges section. */
12094 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
12095 return PC_BOUNDS_INVALID;
12096 /* Found discontinuous range of addresses. */
12097 ret = PC_BOUNDS_RANGES;
12100 return PC_BOUNDS_NOT_PRESENT;
12103 /* read_partial_die has also the strict LOW < HIGH requirement. */
12105 return PC_BOUNDS_INVALID;
12107 /* When using the GNU linker, .gnu.linkonce. sections are used to
12108 eliminate duplicate copies of functions and vtables and such.
12109 The linker will arbitrarily choose one and discard the others.
12110 The AT_*_pc values for such functions refer to local labels in
12111 these sections. If the section from that file was discarded, the
12112 labels are not in the output, so the relocs get a value of 0.
12113 If this is a discarded function, mark the pc bounds as invalid,
12114 so that GDB will ignore it. */
12115 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
12116 return PC_BOUNDS_INVALID;
12124 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
12125 its low and high PC addresses. Do nothing if these addresses could not
12126 be determined. Otherwise, set LOWPC to the low address if it is smaller,
12127 and HIGHPC to the high address if greater than HIGHPC. */
12130 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
12131 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12132 struct dwarf2_cu *cu)
12134 CORE_ADDR low, high;
12135 struct die_info *child = die->child;
12137 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
12139 *lowpc = std::min (*lowpc, low);
12140 *highpc = std::max (*highpc, high);
12143 /* If the language does not allow nested subprograms (either inside
12144 subprograms or lexical blocks), we're done. */
12145 if (cu->language != language_ada)
12148 /* Check all the children of the given DIE. If it contains nested
12149 subprograms, then check their pc bounds. Likewise, we need to
12150 check lexical blocks as well, as they may also contain subprogram
12152 while (child && child->tag)
12154 if (child->tag == DW_TAG_subprogram
12155 || child->tag == DW_TAG_lexical_block)
12156 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
12157 child = sibling_die (child);
12161 /* Get the low and high pc's represented by the scope DIE, and store
12162 them in *LOWPC and *HIGHPC. If the correct values can't be
12163 determined, set *LOWPC to -1 and *HIGHPC to 0. */
12166 get_scope_pc_bounds (struct die_info *die,
12167 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12168 struct dwarf2_cu *cu)
12170 CORE_ADDR best_low = (CORE_ADDR) -1;
12171 CORE_ADDR best_high = (CORE_ADDR) 0;
12172 CORE_ADDR current_low, current_high;
12174 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
12175 >= PC_BOUNDS_RANGES)
12177 best_low = current_low;
12178 best_high = current_high;
12182 struct die_info *child = die->child;
12184 while (child && child->tag)
12186 switch (child->tag) {
12187 case DW_TAG_subprogram:
12188 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
12190 case DW_TAG_namespace:
12191 case DW_TAG_module:
12192 /* FIXME: carlton/2004-01-16: Should we do this for
12193 DW_TAG_class_type/DW_TAG_structure_type, too? I think
12194 that current GCC's always emit the DIEs corresponding
12195 to definitions of methods of classes as children of a
12196 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
12197 the DIEs giving the declarations, which could be
12198 anywhere). But I don't see any reason why the
12199 standards says that they have to be there. */
12200 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
12202 if (current_low != ((CORE_ADDR) -1))
12204 best_low = std::min (best_low, current_low);
12205 best_high = std::max (best_high, current_high);
12213 child = sibling_die (child);
12218 *highpc = best_high;
12221 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
12225 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
12226 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
12228 struct objfile *objfile = cu->objfile;
12229 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12230 struct attribute *attr;
12231 struct attribute *attr_high;
12233 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12236 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12239 CORE_ADDR low = attr_value_as_address (attr);
12240 CORE_ADDR high = attr_value_as_address (attr_high);
12242 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12245 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
12246 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
12247 record_block_range (block, low, high - 1);
12251 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12254 bfd *obfd = objfile->obfd;
12255 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12256 We take advantage of the fact that DW_AT_ranges does not appear
12257 in DW_TAG_compile_unit of DWO files. */
12258 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12260 /* The value of the DW_AT_ranges attribute is the offset of the
12261 address range list in the .debug_ranges section. */
12262 unsigned long offset = (DW_UNSND (attr)
12263 + (need_ranges_base ? cu->ranges_base : 0));
12264 const gdb_byte *buffer;
12266 /* For some target architectures, but not others, the
12267 read_address function sign-extends the addresses it returns.
12268 To recognize base address selection entries, we need a
12270 unsigned int addr_size = cu->header.addr_size;
12271 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12273 /* The base address, to which the next pair is relative. Note
12274 that this 'base' is a DWARF concept: most entries in a range
12275 list are relative, to reduce the number of relocs against the
12276 debugging information. This is separate from this function's
12277 'baseaddr' argument, which GDB uses to relocate debugging
12278 information from a shared library based on the address at
12279 which the library was loaded. */
12280 CORE_ADDR base = cu->base_address;
12281 int base_known = cu->base_known;
12283 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
12284 if (offset >= dwarf2_per_objfile->ranges.size)
12286 complaint (&symfile_complaints,
12287 _("Offset %lu out of bounds for DW_AT_ranges attribute"),
12291 buffer = dwarf2_per_objfile->ranges.buffer + offset;
12295 unsigned int bytes_read;
12296 CORE_ADDR start, end;
12298 start = read_address (obfd, buffer, cu, &bytes_read);
12299 buffer += bytes_read;
12300 end = read_address (obfd, buffer, cu, &bytes_read);
12301 buffer += bytes_read;
12303 /* Did we find the end of the range list? */
12304 if (start == 0 && end == 0)
12307 /* Did we find a base address selection entry? */
12308 else if ((start & base_select_mask) == base_select_mask)
12314 /* We found an ordinary address range. */
12319 complaint (&symfile_complaints,
12320 _("Invalid .debug_ranges data "
12321 "(no base address)"));
12327 /* Inverted range entries are invalid. */
12328 complaint (&symfile_complaints,
12329 _("Invalid .debug_ranges data "
12330 "(inverted range)"));
12334 /* Empty range entries have no effect. */
12338 start += base + baseaddr;
12339 end += base + baseaddr;
12341 /* A not-uncommon case of bad debug info.
12342 Don't pollute the addrmap with bad data. */
12343 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
12345 complaint (&symfile_complaints,
12346 _(".debug_ranges entry has start address of zero"
12347 " [in module %s]"), objfile_name (objfile));
12351 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
12352 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
12353 record_block_range (block, start, end - 1);
12359 /* Check whether the producer field indicates either of GCC < 4.6, or the
12360 Intel C/C++ compiler, and cache the result in CU. */
12363 check_producer (struct dwarf2_cu *cu)
12367 if (cu->producer == NULL)
12369 /* For unknown compilers expect their behavior is DWARF version
12372 GCC started to support .debug_types sections by -gdwarf-4 since
12373 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
12374 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
12375 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
12376 interpreted incorrectly by GDB now - GCC PR debug/48229. */
12378 else if (producer_is_gcc (cu->producer, &major, &minor))
12380 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
12381 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
12383 else if (startswith (cu->producer, "Intel(R) C"))
12384 cu->producer_is_icc = 1;
12387 /* For other non-GCC compilers, expect their behavior is DWARF version
12391 cu->checked_producer = 1;
12394 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
12395 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
12396 during 4.6.0 experimental. */
12399 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
12401 if (!cu->checked_producer)
12402 check_producer (cu);
12404 return cu->producer_is_gxx_lt_4_6;
12407 /* Return the default accessibility type if it is not overriden by
12408 DW_AT_accessibility. */
12410 static enum dwarf_access_attribute
12411 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
12413 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
12415 /* The default DWARF 2 accessibility for members is public, the default
12416 accessibility for inheritance is private. */
12418 if (die->tag != DW_TAG_inheritance)
12419 return DW_ACCESS_public;
12421 return DW_ACCESS_private;
12425 /* DWARF 3+ defines the default accessibility a different way. The same
12426 rules apply now for DW_TAG_inheritance as for the members and it only
12427 depends on the container kind. */
12429 if (die->parent->tag == DW_TAG_class_type)
12430 return DW_ACCESS_private;
12432 return DW_ACCESS_public;
12436 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
12437 offset. If the attribute was not found return 0, otherwise return
12438 1. If it was found but could not properly be handled, set *OFFSET
12442 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
12445 struct attribute *attr;
12447 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
12452 /* Note that we do not check for a section offset first here.
12453 This is because DW_AT_data_member_location is new in DWARF 4,
12454 so if we see it, we can assume that a constant form is really
12455 a constant and not a section offset. */
12456 if (attr_form_is_constant (attr))
12457 *offset = dwarf2_get_attr_constant_value (attr, 0);
12458 else if (attr_form_is_section_offset (attr))
12459 dwarf2_complex_location_expr_complaint ();
12460 else if (attr_form_is_block (attr))
12461 *offset = decode_locdesc (DW_BLOCK (attr), cu);
12463 dwarf2_complex_location_expr_complaint ();
12471 /* Add an aggregate field to the field list. */
12474 dwarf2_add_field (struct field_info *fip, struct die_info *die,
12475 struct dwarf2_cu *cu)
12477 struct objfile *objfile = cu->objfile;
12478 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12479 struct nextfield *new_field;
12480 struct attribute *attr;
12482 const char *fieldname = "";
12484 /* Allocate a new field list entry and link it in. */
12485 new_field = XNEW (struct nextfield);
12486 make_cleanup (xfree, new_field);
12487 memset (new_field, 0, sizeof (struct nextfield));
12489 if (die->tag == DW_TAG_inheritance)
12491 new_field->next = fip->baseclasses;
12492 fip->baseclasses = new_field;
12496 new_field->next = fip->fields;
12497 fip->fields = new_field;
12501 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
12503 new_field->accessibility = DW_UNSND (attr);
12505 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
12506 if (new_field->accessibility != DW_ACCESS_public)
12507 fip->non_public_fields = 1;
12509 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
12511 new_field->virtuality = DW_UNSND (attr);
12513 new_field->virtuality = DW_VIRTUALITY_none;
12515 fp = &new_field->field;
12517 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
12521 /* Data member other than a C++ static data member. */
12523 /* Get type of field. */
12524 fp->type = die_type (die, cu);
12526 SET_FIELD_BITPOS (*fp, 0);
12528 /* Get bit size of field (zero if none). */
12529 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
12532 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
12536 FIELD_BITSIZE (*fp) = 0;
12539 /* Get bit offset of field. */
12540 if (handle_data_member_location (die, cu, &offset))
12541 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
12542 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
12545 if (gdbarch_bits_big_endian (gdbarch))
12547 /* For big endian bits, the DW_AT_bit_offset gives the
12548 additional bit offset from the MSB of the containing
12549 anonymous object to the MSB of the field. We don't
12550 have to do anything special since we don't need to
12551 know the size of the anonymous object. */
12552 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
12556 /* For little endian bits, compute the bit offset to the
12557 MSB of the anonymous object, subtract off the number of
12558 bits from the MSB of the field to the MSB of the
12559 object, and then subtract off the number of bits of
12560 the field itself. The result is the bit offset of
12561 the LSB of the field. */
12562 int anonymous_size;
12563 int bit_offset = DW_UNSND (attr);
12565 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12568 /* The size of the anonymous object containing
12569 the bit field is explicit, so use the
12570 indicated size (in bytes). */
12571 anonymous_size = DW_UNSND (attr);
12575 /* The size of the anonymous object containing
12576 the bit field must be inferred from the type
12577 attribute of the data member containing the
12579 anonymous_size = TYPE_LENGTH (fp->type);
12581 SET_FIELD_BITPOS (*fp,
12582 (FIELD_BITPOS (*fp)
12583 + anonymous_size * bits_per_byte
12584 - bit_offset - FIELD_BITSIZE (*fp)));
12588 /* Get name of field. */
12589 fieldname = dwarf2_name (die, cu);
12590 if (fieldname == NULL)
12593 /* The name is already allocated along with this objfile, so we don't
12594 need to duplicate it for the type. */
12595 fp->name = fieldname;
12597 /* Change accessibility for artificial fields (e.g. virtual table
12598 pointer or virtual base class pointer) to private. */
12599 if (dwarf2_attr (die, DW_AT_artificial, cu))
12601 FIELD_ARTIFICIAL (*fp) = 1;
12602 new_field->accessibility = DW_ACCESS_private;
12603 fip->non_public_fields = 1;
12606 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
12608 /* C++ static member. */
12610 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
12611 is a declaration, but all versions of G++ as of this writing
12612 (so through at least 3.2.1) incorrectly generate
12613 DW_TAG_variable tags. */
12615 const char *physname;
12617 /* Get name of field. */
12618 fieldname = dwarf2_name (die, cu);
12619 if (fieldname == NULL)
12622 attr = dwarf2_attr (die, DW_AT_const_value, cu);
12624 /* Only create a symbol if this is an external value.
12625 new_symbol checks this and puts the value in the global symbol
12626 table, which we want. If it is not external, new_symbol
12627 will try to put the value in cu->list_in_scope which is wrong. */
12628 && dwarf2_flag_true_p (die, DW_AT_external, cu))
12630 /* A static const member, not much different than an enum as far as
12631 we're concerned, except that we can support more types. */
12632 new_symbol (die, NULL, cu);
12635 /* Get physical name. */
12636 physname = dwarf2_physname (fieldname, die, cu);
12638 /* The name is already allocated along with this objfile, so we don't
12639 need to duplicate it for the type. */
12640 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
12641 FIELD_TYPE (*fp) = die_type (die, cu);
12642 FIELD_NAME (*fp) = fieldname;
12644 else if (die->tag == DW_TAG_inheritance)
12648 /* C++ base class field. */
12649 if (handle_data_member_location (die, cu, &offset))
12650 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
12651 FIELD_BITSIZE (*fp) = 0;
12652 FIELD_TYPE (*fp) = die_type (die, cu);
12653 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
12654 fip->nbaseclasses++;
12658 /* Add a typedef defined in the scope of the FIP's class. */
12661 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
12662 struct dwarf2_cu *cu)
12664 struct typedef_field_list *new_field;
12665 struct typedef_field *fp;
12667 /* Allocate a new field list entry and link it in. */
12668 new_field = XCNEW (struct typedef_field_list);
12669 make_cleanup (xfree, new_field);
12671 gdb_assert (die->tag == DW_TAG_typedef);
12673 fp = &new_field->field;
12675 /* Get name of field. */
12676 fp->name = dwarf2_name (die, cu);
12677 if (fp->name == NULL)
12680 fp->type = read_type_die (die, cu);
12682 new_field->next = fip->typedef_field_list;
12683 fip->typedef_field_list = new_field;
12684 fip->typedef_field_list_count++;
12687 /* Create the vector of fields, and attach it to the type. */
12690 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
12691 struct dwarf2_cu *cu)
12693 int nfields = fip->nfields;
12695 /* Record the field count, allocate space for the array of fields,
12696 and create blank accessibility bitfields if necessary. */
12697 TYPE_NFIELDS (type) = nfields;
12698 TYPE_FIELDS (type) = (struct field *)
12699 TYPE_ALLOC (type, sizeof (struct field) * nfields);
12700 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
12702 if (fip->non_public_fields && cu->language != language_ada)
12704 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12706 TYPE_FIELD_PRIVATE_BITS (type) =
12707 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
12708 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
12710 TYPE_FIELD_PROTECTED_BITS (type) =
12711 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
12712 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
12714 TYPE_FIELD_IGNORE_BITS (type) =
12715 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
12716 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
12719 /* If the type has baseclasses, allocate and clear a bit vector for
12720 TYPE_FIELD_VIRTUAL_BITS. */
12721 if (fip->nbaseclasses && cu->language != language_ada)
12723 int num_bytes = B_BYTES (fip->nbaseclasses);
12724 unsigned char *pointer;
12726 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12727 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
12728 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
12729 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
12730 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
12733 /* Copy the saved-up fields into the field vector. Start from the head of
12734 the list, adding to the tail of the field array, so that they end up in
12735 the same order in the array in which they were added to the list. */
12736 while (nfields-- > 0)
12738 struct nextfield *fieldp;
12742 fieldp = fip->fields;
12743 fip->fields = fieldp->next;
12747 fieldp = fip->baseclasses;
12748 fip->baseclasses = fieldp->next;
12751 TYPE_FIELD (type, nfields) = fieldp->field;
12752 switch (fieldp->accessibility)
12754 case DW_ACCESS_private:
12755 if (cu->language != language_ada)
12756 SET_TYPE_FIELD_PRIVATE (type, nfields);
12759 case DW_ACCESS_protected:
12760 if (cu->language != language_ada)
12761 SET_TYPE_FIELD_PROTECTED (type, nfields);
12764 case DW_ACCESS_public:
12768 /* Unknown accessibility. Complain and treat it as public. */
12770 complaint (&symfile_complaints, _("unsupported accessibility %d"),
12771 fieldp->accessibility);
12775 if (nfields < fip->nbaseclasses)
12777 switch (fieldp->virtuality)
12779 case DW_VIRTUALITY_virtual:
12780 case DW_VIRTUALITY_pure_virtual:
12781 if (cu->language == language_ada)
12782 error (_("unexpected virtuality in component of Ada type"));
12783 SET_TYPE_FIELD_VIRTUAL (type, nfields);
12790 /* Return true if this member function is a constructor, false
12794 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
12796 const char *fieldname;
12797 const char *type_name;
12800 if (die->parent == NULL)
12803 if (die->parent->tag != DW_TAG_structure_type
12804 && die->parent->tag != DW_TAG_union_type
12805 && die->parent->tag != DW_TAG_class_type)
12808 fieldname = dwarf2_name (die, cu);
12809 type_name = dwarf2_name (die->parent, cu);
12810 if (fieldname == NULL || type_name == NULL)
12813 len = strlen (fieldname);
12814 return (strncmp (fieldname, type_name, len) == 0
12815 && (type_name[len] == '\0' || type_name[len] == '<'));
12818 /* Add a member function to the proper fieldlist. */
12821 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
12822 struct type *type, struct dwarf2_cu *cu)
12824 struct objfile *objfile = cu->objfile;
12825 struct attribute *attr;
12826 struct fnfieldlist *flp;
12828 struct fn_field *fnp;
12829 const char *fieldname;
12830 struct nextfnfield *new_fnfield;
12831 struct type *this_type;
12832 enum dwarf_access_attribute accessibility;
12834 if (cu->language == language_ada)
12835 error (_("unexpected member function in Ada type"));
12837 /* Get name of member function. */
12838 fieldname = dwarf2_name (die, cu);
12839 if (fieldname == NULL)
12842 /* Look up member function name in fieldlist. */
12843 for (i = 0; i < fip->nfnfields; i++)
12845 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
12849 /* Create new list element if necessary. */
12850 if (i < fip->nfnfields)
12851 flp = &fip->fnfieldlists[i];
12854 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
12856 fip->fnfieldlists = (struct fnfieldlist *)
12857 xrealloc (fip->fnfieldlists,
12858 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
12859 * sizeof (struct fnfieldlist));
12860 if (fip->nfnfields == 0)
12861 make_cleanup (free_current_contents, &fip->fnfieldlists);
12863 flp = &fip->fnfieldlists[fip->nfnfields];
12864 flp->name = fieldname;
12867 i = fip->nfnfields++;
12870 /* Create a new member function field and chain it to the field list
12872 new_fnfield = XNEW (struct nextfnfield);
12873 make_cleanup (xfree, new_fnfield);
12874 memset (new_fnfield, 0, sizeof (struct nextfnfield));
12875 new_fnfield->next = flp->head;
12876 flp->head = new_fnfield;
12879 /* Fill in the member function field info. */
12880 fnp = &new_fnfield->fnfield;
12882 /* Delay processing of the physname until later. */
12883 if (cu->language == language_cplus)
12885 add_to_method_list (type, i, flp->length - 1, fieldname,
12890 const char *physname = dwarf2_physname (fieldname, die, cu);
12891 fnp->physname = physname ? physname : "";
12894 fnp->type = alloc_type (objfile);
12895 this_type = read_type_die (die, cu);
12896 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
12898 int nparams = TYPE_NFIELDS (this_type);
12900 /* TYPE is the domain of this method, and THIS_TYPE is the type
12901 of the method itself (TYPE_CODE_METHOD). */
12902 smash_to_method_type (fnp->type, type,
12903 TYPE_TARGET_TYPE (this_type),
12904 TYPE_FIELDS (this_type),
12905 TYPE_NFIELDS (this_type),
12906 TYPE_VARARGS (this_type));
12908 /* Handle static member functions.
12909 Dwarf2 has no clean way to discern C++ static and non-static
12910 member functions. G++ helps GDB by marking the first
12911 parameter for non-static member functions (which is the this
12912 pointer) as artificial. We obtain this information from
12913 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
12914 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
12915 fnp->voffset = VOFFSET_STATIC;
12918 complaint (&symfile_complaints, _("member function type missing for '%s'"),
12919 dwarf2_full_name (fieldname, die, cu));
12921 /* Get fcontext from DW_AT_containing_type if present. */
12922 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
12923 fnp->fcontext = die_containing_type (die, cu);
12925 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
12926 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
12928 /* Get accessibility. */
12929 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
12931 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
12933 accessibility = dwarf2_default_access_attribute (die, cu);
12934 switch (accessibility)
12936 case DW_ACCESS_private:
12937 fnp->is_private = 1;
12939 case DW_ACCESS_protected:
12940 fnp->is_protected = 1;
12944 /* Check for artificial methods. */
12945 attr = dwarf2_attr (die, DW_AT_artificial, cu);
12946 if (attr && DW_UNSND (attr) != 0)
12947 fnp->is_artificial = 1;
12949 fnp->is_constructor = dwarf2_is_constructor (die, cu);
12951 /* Get index in virtual function table if it is a virtual member
12952 function. For older versions of GCC, this is an offset in the
12953 appropriate virtual table, as specified by DW_AT_containing_type.
12954 For everyone else, it is an expression to be evaluated relative
12955 to the object address. */
12957 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
12960 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
12962 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
12964 /* Old-style GCC. */
12965 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
12967 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
12968 || (DW_BLOCK (attr)->size > 1
12969 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
12970 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
12972 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
12973 if ((fnp->voffset % cu->header.addr_size) != 0)
12974 dwarf2_complex_location_expr_complaint ();
12976 fnp->voffset /= cu->header.addr_size;
12980 dwarf2_complex_location_expr_complaint ();
12982 if (!fnp->fcontext)
12984 /* If there is no `this' field and no DW_AT_containing_type,
12985 we cannot actually find a base class context for the
12987 if (TYPE_NFIELDS (this_type) == 0
12988 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
12990 complaint (&symfile_complaints,
12991 _("cannot determine context for virtual member "
12992 "function \"%s\" (offset %d)"),
12993 fieldname, die->offset.sect_off);
12998 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
13002 else if (attr_form_is_section_offset (attr))
13004 dwarf2_complex_location_expr_complaint ();
13008 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
13014 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
13015 if (attr && DW_UNSND (attr))
13017 /* GCC does this, as of 2008-08-25; PR debug/37237. */
13018 complaint (&symfile_complaints,
13019 _("Member function \"%s\" (offset %d) is virtual "
13020 "but the vtable offset is not specified"),
13021 fieldname, die->offset.sect_off);
13022 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13023 TYPE_CPLUS_DYNAMIC (type) = 1;
13028 /* Create the vector of member function fields, and attach it to the type. */
13031 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
13032 struct dwarf2_cu *cu)
13034 struct fnfieldlist *flp;
13037 if (cu->language == language_ada)
13038 error (_("unexpected member functions in Ada type"));
13040 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13041 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
13042 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
13044 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
13046 struct nextfnfield *nfp = flp->head;
13047 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
13050 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
13051 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
13052 fn_flp->fn_fields = (struct fn_field *)
13053 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
13054 for (k = flp->length; (k--, nfp); nfp = nfp->next)
13055 fn_flp->fn_fields[k] = nfp->fnfield;
13058 TYPE_NFN_FIELDS (type) = fip->nfnfields;
13061 /* Returns non-zero if NAME is the name of a vtable member in CU's
13062 language, zero otherwise. */
13064 is_vtable_name (const char *name, struct dwarf2_cu *cu)
13066 static const char vptr[] = "_vptr";
13067 static const char vtable[] = "vtable";
13069 /* Look for the C++ form of the vtable. */
13070 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
13076 /* GCC outputs unnamed structures that are really pointers to member
13077 functions, with the ABI-specified layout. If TYPE describes
13078 such a structure, smash it into a member function type.
13080 GCC shouldn't do this; it should just output pointer to member DIEs.
13081 This is GCC PR debug/28767. */
13084 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
13086 struct type *pfn_type, *self_type, *new_type;
13088 /* Check for a structure with no name and two children. */
13089 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
13092 /* Check for __pfn and __delta members. */
13093 if (TYPE_FIELD_NAME (type, 0) == NULL
13094 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
13095 || TYPE_FIELD_NAME (type, 1) == NULL
13096 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
13099 /* Find the type of the method. */
13100 pfn_type = TYPE_FIELD_TYPE (type, 0);
13101 if (pfn_type == NULL
13102 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
13103 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
13106 /* Look for the "this" argument. */
13107 pfn_type = TYPE_TARGET_TYPE (pfn_type);
13108 if (TYPE_NFIELDS (pfn_type) == 0
13109 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
13110 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
13113 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
13114 new_type = alloc_type (objfile);
13115 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
13116 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
13117 TYPE_VARARGS (pfn_type));
13118 smash_to_methodptr_type (type, new_type);
13121 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
13125 producer_is_icc (struct dwarf2_cu *cu)
13127 if (!cu->checked_producer)
13128 check_producer (cu);
13130 return cu->producer_is_icc;
13133 /* Called when we find the DIE that starts a structure or union scope
13134 (definition) to create a type for the structure or union. Fill in
13135 the type's name and general properties; the members will not be
13136 processed until process_structure_scope. A symbol table entry for
13137 the type will also not be done until process_structure_scope (assuming
13138 the type has a name).
13140 NOTE: we need to call these functions regardless of whether or not the
13141 DIE has a DW_AT_name attribute, since it might be an anonymous
13142 structure or union. This gets the type entered into our set of
13143 user defined types. */
13145 static struct type *
13146 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
13148 struct objfile *objfile = cu->objfile;
13150 struct attribute *attr;
13153 /* If the definition of this type lives in .debug_types, read that type.
13154 Don't follow DW_AT_specification though, that will take us back up
13155 the chain and we want to go down. */
13156 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13159 type = get_DW_AT_signature_type (die, attr, cu);
13161 /* The type's CU may not be the same as CU.
13162 Ensure TYPE is recorded with CU in die_type_hash. */
13163 return set_die_type (die, type, cu);
13166 type = alloc_type (objfile);
13167 INIT_CPLUS_SPECIFIC (type);
13169 name = dwarf2_name (die, cu);
13172 if (cu->language == language_cplus
13173 || cu->language == language_d
13174 || cu->language == language_rust)
13176 const char *full_name = dwarf2_full_name (name, die, cu);
13178 /* dwarf2_full_name might have already finished building the DIE's
13179 type. If so, there is no need to continue. */
13180 if (get_die_type (die, cu) != NULL)
13181 return get_die_type (die, cu);
13183 TYPE_TAG_NAME (type) = full_name;
13184 if (die->tag == DW_TAG_structure_type
13185 || die->tag == DW_TAG_class_type)
13186 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13190 /* The name is already allocated along with this objfile, so
13191 we don't need to duplicate it for the type. */
13192 TYPE_TAG_NAME (type) = name;
13193 if (die->tag == DW_TAG_class_type)
13194 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13198 if (die->tag == DW_TAG_structure_type)
13200 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13202 else if (die->tag == DW_TAG_union_type)
13204 TYPE_CODE (type) = TYPE_CODE_UNION;
13208 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13211 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
13212 TYPE_DECLARED_CLASS (type) = 1;
13214 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13217 if (attr_form_is_constant (attr))
13218 TYPE_LENGTH (type) = DW_UNSND (attr);
13221 /* For the moment, dynamic type sizes are not supported
13222 by GDB's struct type. The actual size is determined
13223 on-demand when resolving the type of a given object,
13224 so set the type's length to zero for now. Otherwise,
13225 we record an expression as the length, and that expression
13226 could lead to a very large value, which could eventually
13227 lead to us trying to allocate that much memory when creating
13228 a value of that type. */
13229 TYPE_LENGTH (type) = 0;
13234 TYPE_LENGTH (type) = 0;
13237 if (producer_is_icc (cu) && (TYPE_LENGTH (type) == 0))
13239 /* ICC does not output the required DW_AT_declaration
13240 on incomplete types, but gives them a size of zero. */
13241 TYPE_STUB (type) = 1;
13244 TYPE_STUB_SUPPORTED (type) = 1;
13246 if (die_is_declaration (die, cu))
13247 TYPE_STUB (type) = 1;
13248 else if (attr == NULL && die->child == NULL
13249 && producer_is_realview (cu->producer))
13250 /* RealView does not output the required DW_AT_declaration
13251 on incomplete types. */
13252 TYPE_STUB (type) = 1;
13254 /* We need to add the type field to the die immediately so we don't
13255 infinitely recurse when dealing with pointers to the structure
13256 type within the structure itself. */
13257 set_die_type (die, type, cu);
13259 /* set_die_type should be already done. */
13260 set_descriptive_type (type, die, cu);
13265 /* Finish creating a structure or union type, including filling in
13266 its members and creating a symbol for it. */
13269 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
13271 struct objfile *objfile = cu->objfile;
13272 struct die_info *child_die;
13275 type = get_die_type (die, cu);
13277 type = read_structure_type (die, cu);
13279 if (die->child != NULL && ! die_is_declaration (die, cu))
13281 struct field_info fi;
13282 VEC (symbolp) *template_args = NULL;
13283 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
13285 memset (&fi, 0, sizeof (struct field_info));
13287 child_die = die->child;
13289 while (child_die && child_die->tag)
13291 if (child_die->tag == DW_TAG_member
13292 || child_die->tag == DW_TAG_variable)
13294 /* NOTE: carlton/2002-11-05: A C++ static data member
13295 should be a DW_TAG_member that is a declaration, but
13296 all versions of G++ as of this writing (so through at
13297 least 3.2.1) incorrectly generate DW_TAG_variable
13298 tags for them instead. */
13299 dwarf2_add_field (&fi, child_die, cu);
13301 else if (child_die->tag == DW_TAG_subprogram)
13303 /* Rust doesn't have member functions in the C++ sense.
13304 However, it does emit ordinary functions as children
13305 of a struct DIE. */
13306 if (cu->language == language_rust)
13307 read_func_scope (child_die, cu);
13310 /* C++ member function. */
13311 dwarf2_add_member_fn (&fi, child_die, type, cu);
13314 else if (child_die->tag == DW_TAG_inheritance)
13316 /* C++ base class field. */
13317 dwarf2_add_field (&fi, child_die, cu);
13319 else if (child_die->tag == DW_TAG_typedef)
13320 dwarf2_add_typedef (&fi, child_die, cu);
13321 else if (child_die->tag == DW_TAG_template_type_param
13322 || child_die->tag == DW_TAG_template_value_param)
13324 struct symbol *arg = new_symbol (child_die, NULL, cu);
13327 VEC_safe_push (symbolp, template_args, arg);
13330 child_die = sibling_die (child_die);
13333 /* Attach template arguments to type. */
13334 if (! VEC_empty (symbolp, template_args))
13336 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13337 TYPE_N_TEMPLATE_ARGUMENTS (type)
13338 = VEC_length (symbolp, template_args);
13339 TYPE_TEMPLATE_ARGUMENTS (type)
13340 = XOBNEWVEC (&objfile->objfile_obstack,
13342 TYPE_N_TEMPLATE_ARGUMENTS (type));
13343 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
13344 VEC_address (symbolp, template_args),
13345 (TYPE_N_TEMPLATE_ARGUMENTS (type)
13346 * sizeof (struct symbol *)));
13347 VEC_free (symbolp, template_args);
13350 /* Attach fields and member functions to the type. */
13352 dwarf2_attach_fields_to_type (&fi, type, cu);
13355 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
13357 /* Get the type which refers to the base class (possibly this
13358 class itself) which contains the vtable pointer for the current
13359 class from the DW_AT_containing_type attribute. This use of
13360 DW_AT_containing_type is a GNU extension. */
13362 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13364 struct type *t = die_containing_type (die, cu);
13366 set_type_vptr_basetype (type, t);
13371 /* Our own class provides vtbl ptr. */
13372 for (i = TYPE_NFIELDS (t) - 1;
13373 i >= TYPE_N_BASECLASSES (t);
13376 const char *fieldname = TYPE_FIELD_NAME (t, i);
13378 if (is_vtable_name (fieldname, cu))
13380 set_type_vptr_fieldno (type, i);
13385 /* Complain if virtual function table field not found. */
13386 if (i < TYPE_N_BASECLASSES (t))
13387 complaint (&symfile_complaints,
13388 _("virtual function table pointer "
13389 "not found when defining class '%s'"),
13390 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
13395 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
13398 else if (cu->producer
13399 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
13401 /* The IBM XLC compiler does not provide direct indication
13402 of the containing type, but the vtable pointer is
13403 always named __vfp. */
13407 for (i = TYPE_NFIELDS (type) - 1;
13408 i >= TYPE_N_BASECLASSES (type);
13411 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
13413 set_type_vptr_fieldno (type, i);
13414 set_type_vptr_basetype (type, type);
13421 /* Copy fi.typedef_field_list linked list elements content into the
13422 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
13423 if (fi.typedef_field_list)
13425 int i = fi.typedef_field_list_count;
13427 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13428 TYPE_TYPEDEF_FIELD_ARRAY (type)
13429 = ((struct typedef_field *)
13430 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
13431 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
13433 /* Reverse the list order to keep the debug info elements order. */
13436 struct typedef_field *dest, *src;
13438 dest = &TYPE_TYPEDEF_FIELD (type, i);
13439 src = &fi.typedef_field_list->field;
13440 fi.typedef_field_list = fi.typedef_field_list->next;
13445 do_cleanups (back_to);
13448 quirk_gcc_member_function_pointer (type, objfile);
13450 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
13451 snapshots) has been known to create a die giving a declaration
13452 for a class that has, as a child, a die giving a definition for a
13453 nested class. So we have to process our children even if the
13454 current die is a declaration. Normally, of course, a declaration
13455 won't have any children at all. */
13457 child_die = die->child;
13459 while (child_die != NULL && child_die->tag)
13461 if (child_die->tag == DW_TAG_member
13462 || child_die->tag == DW_TAG_variable
13463 || child_die->tag == DW_TAG_inheritance
13464 || child_die->tag == DW_TAG_template_value_param
13465 || child_die->tag == DW_TAG_template_type_param)
13470 process_die (child_die, cu);
13472 child_die = sibling_die (child_die);
13475 /* Do not consider external references. According to the DWARF standard,
13476 these DIEs are identified by the fact that they have no byte_size
13477 attribute, and a declaration attribute. */
13478 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
13479 || !die_is_declaration (die, cu))
13480 new_symbol (die, type, cu);
13483 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
13484 update TYPE using some information only available in DIE's children. */
13487 update_enumeration_type_from_children (struct die_info *die,
13489 struct dwarf2_cu *cu)
13491 struct obstack obstack;
13492 struct die_info *child_die;
13493 int unsigned_enum = 1;
13496 struct cleanup *old_chain;
13498 obstack_init (&obstack);
13499 old_chain = make_cleanup_obstack_free (&obstack);
13501 for (child_die = die->child;
13502 child_die != NULL && child_die->tag;
13503 child_die = sibling_die (child_die))
13505 struct attribute *attr;
13507 const gdb_byte *bytes;
13508 struct dwarf2_locexpr_baton *baton;
13511 if (child_die->tag != DW_TAG_enumerator)
13514 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
13518 name = dwarf2_name (child_die, cu);
13520 name = "<anonymous enumerator>";
13522 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
13523 &value, &bytes, &baton);
13529 else if ((mask & value) != 0)
13534 /* If we already know that the enum type is neither unsigned, nor
13535 a flag type, no need to look at the rest of the enumerates. */
13536 if (!unsigned_enum && !flag_enum)
13541 TYPE_UNSIGNED (type) = 1;
13543 TYPE_FLAG_ENUM (type) = 1;
13545 do_cleanups (old_chain);
13548 /* Given a DW_AT_enumeration_type die, set its type. We do not
13549 complete the type's fields yet, or create any symbols. */
13551 static struct type *
13552 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
13554 struct objfile *objfile = cu->objfile;
13556 struct attribute *attr;
13559 /* If the definition of this type lives in .debug_types, read that type.
13560 Don't follow DW_AT_specification though, that will take us back up
13561 the chain and we want to go down. */
13562 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13565 type = get_DW_AT_signature_type (die, attr, cu);
13567 /* The type's CU may not be the same as CU.
13568 Ensure TYPE is recorded with CU in die_type_hash. */
13569 return set_die_type (die, type, cu);
13572 type = alloc_type (objfile);
13574 TYPE_CODE (type) = TYPE_CODE_ENUM;
13575 name = dwarf2_full_name (NULL, die, cu);
13577 TYPE_TAG_NAME (type) = name;
13579 attr = dwarf2_attr (die, DW_AT_type, cu);
13582 struct type *underlying_type = die_type (die, cu);
13584 TYPE_TARGET_TYPE (type) = underlying_type;
13587 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13590 TYPE_LENGTH (type) = DW_UNSND (attr);
13594 TYPE_LENGTH (type) = 0;
13597 /* The enumeration DIE can be incomplete. In Ada, any type can be
13598 declared as private in the package spec, and then defined only
13599 inside the package body. Such types are known as Taft Amendment
13600 Types. When another package uses such a type, an incomplete DIE
13601 may be generated by the compiler. */
13602 if (die_is_declaration (die, cu))
13603 TYPE_STUB (type) = 1;
13605 /* Finish the creation of this type by using the enum's children.
13606 We must call this even when the underlying type has been provided
13607 so that we can determine if we're looking at a "flag" enum. */
13608 update_enumeration_type_from_children (die, type, cu);
13610 /* If this type has an underlying type that is not a stub, then we
13611 may use its attributes. We always use the "unsigned" attribute
13612 in this situation, because ordinarily we guess whether the type
13613 is unsigned -- but the guess can be wrong and the underlying type
13614 can tell us the reality. However, we defer to a local size
13615 attribute if one exists, because this lets the compiler override
13616 the underlying type if needed. */
13617 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
13619 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
13620 if (TYPE_LENGTH (type) == 0)
13621 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
13624 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
13626 return set_die_type (die, type, cu);
13629 /* Given a pointer to a die which begins an enumeration, process all
13630 the dies that define the members of the enumeration, and create the
13631 symbol for the enumeration type.
13633 NOTE: We reverse the order of the element list. */
13636 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
13638 struct type *this_type;
13640 this_type = get_die_type (die, cu);
13641 if (this_type == NULL)
13642 this_type = read_enumeration_type (die, cu);
13644 if (die->child != NULL)
13646 struct die_info *child_die;
13647 struct symbol *sym;
13648 struct field *fields = NULL;
13649 int num_fields = 0;
13652 child_die = die->child;
13653 while (child_die && child_die->tag)
13655 if (child_die->tag != DW_TAG_enumerator)
13657 process_die (child_die, cu);
13661 name = dwarf2_name (child_die, cu);
13664 sym = new_symbol (child_die, this_type, cu);
13666 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
13668 fields = (struct field *)
13670 (num_fields + DW_FIELD_ALLOC_CHUNK)
13671 * sizeof (struct field));
13674 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
13675 FIELD_TYPE (fields[num_fields]) = NULL;
13676 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
13677 FIELD_BITSIZE (fields[num_fields]) = 0;
13683 child_die = sibling_die (child_die);
13688 TYPE_NFIELDS (this_type) = num_fields;
13689 TYPE_FIELDS (this_type) = (struct field *)
13690 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
13691 memcpy (TYPE_FIELDS (this_type), fields,
13692 sizeof (struct field) * num_fields);
13697 /* If we are reading an enum from a .debug_types unit, and the enum
13698 is a declaration, and the enum is not the signatured type in the
13699 unit, then we do not want to add a symbol for it. Adding a
13700 symbol would in some cases obscure the true definition of the
13701 enum, giving users an incomplete type when the definition is
13702 actually available. Note that we do not want to do this for all
13703 enums which are just declarations, because C++0x allows forward
13704 enum declarations. */
13705 if (cu->per_cu->is_debug_types
13706 && die_is_declaration (die, cu))
13708 struct signatured_type *sig_type;
13710 sig_type = (struct signatured_type *) cu->per_cu;
13711 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
13712 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
13716 new_symbol (die, this_type, cu);
13719 /* Extract all information from a DW_TAG_array_type DIE and put it in
13720 the DIE's type field. For now, this only handles one dimensional
13723 static struct type *
13724 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
13726 struct objfile *objfile = cu->objfile;
13727 struct die_info *child_die;
13729 struct type *element_type, *range_type, *index_type;
13730 struct type **range_types = NULL;
13731 struct attribute *attr;
13733 struct cleanup *back_to;
13735 unsigned int bit_stride = 0;
13737 element_type = die_type (die, cu);
13739 /* The die_type call above may have already set the type for this DIE. */
13740 type = get_die_type (die, cu);
13744 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
13746 bit_stride = DW_UNSND (attr) * 8;
13748 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
13750 bit_stride = DW_UNSND (attr);
13752 /* Irix 6.2 native cc creates array types without children for
13753 arrays with unspecified length. */
13754 if (die->child == NULL)
13756 index_type = objfile_type (objfile)->builtin_int;
13757 range_type = create_static_range_type (NULL, index_type, 0, -1);
13758 type = create_array_type_with_stride (NULL, element_type, range_type,
13760 return set_die_type (die, type, cu);
13763 back_to = make_cleanup (null_cleanup, NULL);
13764 child_die = die->child;
13765 while (child_die && child_die->tag)
13767 if (child_die->tag == DW_TAG_subrange_type)
13769 struct type *child_type = read_type_die (child_die, cu);
13771 if (child_type != NULL)
13773 /* The range type was succesfully read. Save it for the
13774 array type creation. */
13775 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
13777 range_types = (struct type **)
13778 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
13779 * sizeof (struct type *));
13781 make_cleanup (free_current_contents, &range_types);
13783 range_types[ndim++] = child_type;
13786 child_die = sibling_die (child_die);
13789 /* Dwarf2 dimensions are output from left to right, create the
13790 necessary array types in backwards order. */
13792 type = element_type;
13794 if (read_array_order (die, cu) == DW_ORD_col_major)
13799 type = create_array_type_with_stride (NULL, type, range_types[i++],
13805 type = create_array_type_with_stride (NULL, type, range_types[ndim],
13809 /* Understand Dwarf2 support for vector types (like they occur on
13810 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
13811 array type. This is not part of the Dwarf2/3 standard yet, but a
13812 custom vendor extension. The main difference between a regular
13813 array and the vector variant is that vectors are passed by value
13815 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
13817 make_vector_type (type);
13819 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
13820 implementation may choose to implement triple vectors using this
13822 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13825 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
13826 TYPE_LENGTH (type) = DW_UNSND (attr);
13828 complaint (&symfile_complaints,
13829 _("DW_AT_byte_size for array type smaller "
13830 "than the total size of elements"));
13833 name = dwarf2_name (die, cu);
13835 TYPE_NAME (type) = name;
13837 /* Install the type in the die. */
13838 set_die_type (die, type, cu);
13840 /* set_die_type should be already done. */
13841 set_descriptive_type (type, die, cu);
13843 do_cleanups (back_to);
13848 static enum dwarf_array_dim_ordering
13849 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
13851 struct attribute *attr;
13853 attr = dwarf2_attr (die, DW_AT_ordering, cu);
13856 return (enum dwarf_array_dim_ordering) DW_SND (attr);
13858 /* GNU F77 is a special case, as at 08/2004 array type info is the
13859 opposite order to the dwarf2 specification, but data is still
13860 laid out as per normal fortran.
13862 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
13863 version checking. */
13865 if (cu->language == language_fortran
13866 && cu->producer && strstr (cu->producer, "GNU F77"))
13868 return DW_ORD_row_major;
13871 switch (cu->language_defn->la_array_ordering)
13873 case array_column_major:
13874 return DW_ORD_col_major;
13875 case array_row_major:
13877 return DW_ORD_row_major;
13881 /* Extract all information from a DW_TAG_set_type DIE and put it in
13882 the DIE's type field. */
13884 static struct type *
13885 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
13887 struct type *domain_type, *set_type;
13888 struct attribute *attr;
13890 domain_type = die_type (die, cu);
13892 /* The die_type call above may have already set the type for this DIE. */
13893 set_type = get_die_type (die, cu);
13897 set_type = create_set_type (NULL, domain_type);
13899 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13901 TYPE_LENGTH (set_type) = DW_UNSND (attr);
13903 return set_die_type (die, set_type, cu);
13906 /* A helper for read_common_block that creates a locexpr baton.
13907 SYM is the symbol which we are marking as computed.
13908 COMMON_DIE is the DIE for the common block.
13909 COMMON_LOC is the location expression attribute for the common
13911 MEMBER_LOC is the location expression attribute for the particular
13912 member of the common block that we are processing.
13913 CU is the CU from which the above come. */
13916 mark_common_block_symbol_computed (struct symbol *sym,
13917 struct die_info *common_die,
13918 struct attribute *common_loc,
13919 struct attribute *member_loc,
13920 struct dwarf2_cu *cu)
13922 struct objfile *objfile = dwarf2_per_objfile->objfile;
13923 struct dwarf2_locexpr_baton *baton;
13925 unsigned int cu_off;
13926 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
13927 LONGEST offset = 0;
13929 gdb_assert (common_loc && member_loc);
13930 gdb_assert (attr_form_is_block (common_loc));
13931 gdb_assert (attr_form_is_block (member_loc)
13932 || attr_form_is_constant (member_loc));
13934 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
13935 baton->per_cu = cu->per_cu;
13936 gdb_assert (baton->per_cu);
13938 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
13940 if (attr_form_is_constant (member_loc))
13942 offset = dwarf2_get_attr_constant_value (member_loc, 0);
13943 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
13946 baton->size += DW_BLOCK (member_loc)->size;
13948 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
13951 *ptr++ = DW_OP_call4;
13952 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
13953 store_unsigned_integer (ptr, 4, byte_order, cu_off);
13956 if (attr_form_is_constant (member_loc))
13958 *ptr++ = DW_OP_addr;
13959 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
13960 ptr += cu->header.addr_size;
13964 /* We have to copy the data here, because DW_OP_call4 will only
13965 use a DW_AT_location attribute. */
13966 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
13967 ptr += DW_BLOCK (member_loc)->size;
13970 *ptr++ = DW_OP_plus;
13971 gdb_assert (ptr - baton->data == baton->size);
13973 SYMBOL_LOCATION_BATON (sym) = baton;
13974 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
13977 /* Create appropriate locally-scoped variables for all the
13978 DW_TAG_common_block entries. Also create a struct common_block
13979 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
13980 is used to sepate the common blocks name namespace from regular
13984 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
13986 struct attribute *attr;
13988 attr = dwarf2_attr (die, DW_AT_location, cu);
13991 /* Support the .debug_loc offsets. */
13992 if (attr_form_is_block (attr))
13996 else if (attr_form_is_section_offset (attr))
13998 dwarf2_complex_location_expr_complaint ();
14003 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14004 "common block member");
14009 if (die->child != NULL)
14011 struct objfile *objfile = cu->objfile;
14012 struct die_info *child_die;
14013 size_t n_entries = 0, size;
14014 struct common_block *common_block;
14015 struct symbol *sym;
14017 for (child_die = die->child;
14018 child_die && child_die->tag;
14019 child_die = sibling_die (child_die))
14022 size = (sizeof (struct common_block)
14023 + (n_entries - 1) * sizeof (struct symbol *));
14025 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
14027 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
14028 common_block->n_entries = 0;
14030 for (child_die = die->child;
14031 child_die && child_die->tag;
14032 child_die = sibling_die (child_die))
14034 /* Create the symbol in the DW_TAG_common_block block in the current
14036 sym = new_symbol (child_die, NULL, cu);
14039 struct attribute *member_loc;
14041 common_block->contents[common_block->n_entries++] = sym;
14043 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
14047 /* GDB has handled this for a long time, but it is
14048 not specified by DWARF. It seems to have been
14049 emitted by gfortran at least as recently as:
14050 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
14051 complaint (&symfile_complaints,
14052 _("Variable in common block has "
14053 "DW_AT_data_member_location "
14054 "- DIE at 0x%x [in module %s]"),
14055 child_die->offset.sect_off,
14056 objfile_name (cu->objfile));
14058 if (attr_form_is_section_offset (member_loc))
14059 dwarf2_complex_location_expr_complaint ();
14060 else if (attr_form_is_constant (member_loc)
14061 || attr_form_is_block (member_loc))
14064 mark_common_block_symbol_computed (sym, die, attr,
14068 dwarf2_complex_location_expr_complaint ();
14073 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
14074 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
14078 /* Create a type for a C++ namespace. */
14080 static struct type *
14081 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
14083 struct objfile *objfile = cu->objfile;
14084 const char *previous_prefix, *name;
14088 /* For extensions, reuse the type of the original namespace. */
14089 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
14091 struct die_info *ext_die;
14092 struct dwarf2_cu *ext_cu = cu;
14094 ext_die = dwarf2_extension (die, &ext_cu);
14095 type = read_type_die (ext_die, ext_cu);
14097 /* EXT_CU may not be the same as CU.
14098 Ensure TYPE is recorded with CU in die_type_hash. */
14099 return set_die_type (die, type, cu);
14102 name = namespace_name (die, &is_anonymous, cu);
14104 /* Now build the name of the current namespace. */
14106 previous_prefix = determine_prefix (die, cu);
14107 if (previous_prefix[0] != '\0')
14108 name = typename_concat (&objfile->objfile_obstack,
14109 previous_prefix, name, 0, cu);
14111 /* Create the type. */
14112 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
14113 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14115 return set_die_type (die, type, cu);
14118 /* Read a namespace scope. */
14121 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
14123 struct objfile *objfile = cu->objfile;
14126 /* Add a symbol associated to this if we haven't seen the namespace
14127 before. Also, add a using directive if it's an anonymous
14130 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
14134 type = read_type_die (die, cu);
14135 new_symbol (die, type, cu);
14137 namespace_name (die, &is_anonymous, cu);
14140 const char *previous_prefix = determine_prefix (die, cu);
14142 add_using_directive (using_directives (cu->language),
14143 previous_prefix, TYPE_NAME (type), NULL,
14144 NULL, NULL, 0, &objfile->objfile_obstack);
14148 if (die->child != NULL)
14150 struct die_info *child_die = die->child;
14152 while (child_die && child_die->tag)
14154 process_die (child_die, cu);
14155 child_die = sibling_die (child_die);
14160 /* Read a Fortran module as type. This DIE can be only a declaration used for
14161 imported module. Still we need that type as local Fortran "use ... only"
14162 declaration imports depend on the created type in determine_prefix. */
14164 static struct type *
14165 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
14167 struct objfile *objfile = cu->objfile;
14168 const char *module_name;
14171 module_name = dwarf2_name (die, cu);
14173 complaint (&symfile_complaints,
14174 _("DW_TAG_module has no name, offset 0x%x"),
14175 die->offset.sect_off);
14176 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
14178 /* determine_prefix uses TYPE_TAG_NAME. */
14179 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14181 return set_die_type (die, type, cu);
14184 /* Read a Fortran module. */
14187 read_module (struct die_info *die, struct dwarf2_cu *cu)
14189 struct die_info *child_die = die->child;
14192 type = read_type_die (die, cu);
14193 new_symbol (die, type, cu);
14195 while (child_die && child_die->tag)
14197 process_die (child_die, cu);
14198 child_die = sibling_die (child_die);
14202 /* Return the name of the namespace represented by DIE. Set
14203 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
14206 static const char *
14207 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
14209 struct die_info *current_die;
14210 const char *name = NULL;
14212 /* Loop through the extensions until we find a name. */
14214 for (current_die = die;
14215 current_die != NULL;
14216 current_die = dwarf2_extension (die, &cu))
14218 /* We don't use dwarf2_name here so that we can detect the absence
14219 of a name -> anonymous namespace. */
14220 name = dwarf2_string_attr (die, DW_AT_name, cu);
14226 /* Is it an anonymous namespace? */
14228 *is_anonymous = (name == NULL);
14230 name = CP_ANONYMOUS_NAMESPACE_STR;
14235 /* Extract all information from a DW_TAG_pointer_type DIE and add to
14236 the user defined type vector. */
14238 static struct type *
14239 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
14241 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
14242 struct comp_unit_head *cu_header = &cu->header;
14244 struct attribute *attr_byte_size;
14245 struct attribute *attr_address_class;
14246 int byte_size, addr_class;
14247 struct type *target_type;
14249 target_type = die_type (die, cu);
14251 /* The die_type call above may have already set the type for this DIE. */
14252 type = get_die_type (die, cu);
14256 type = lookup_pointer_type (target_type);
14258 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
14259 if (attr_byte_size)
14260 byte_size = DW_UNSND (attr_byte_size);
14262 byte_size = cu_header->addr_size;
14264 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
14265 if (attr_address_class)
14266 addr_class = DW_UNSND (attr_address_class);
14268 addr_class = DW_ADDR_none;
14270 /* If the pointer size or address class is different than the
14271 default, create a type variant marked as such and set the
14272 length accordingly. */
14273 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
14275 if (gdbarch_address_class_type_flags_p (gdbarch))
14279 type_flags = gdbarch_address_class_type_flags
14280 (gdbarch, byte_size, addr_class);
14281 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
14283 type = make_type_with_address_space (type, type_flags);
14285 else if (TYPE_LENGTH (type) != byte_size)
14287 complaint (&symfile_complaints,
14288 _("invalid pointer size %d"), byte_size);
14292 /* Should we also complain about unhandled address classes? */
14296 TYPE_LENGTH (type) = byte_size;
14297 return set_die_type (die, type, cu);
14300 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
14301 the user defined type vector. */
14303 static struct type *
14304 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
14307 struct type *to_type;
14308 struct type *domain;
14310 to_type = die_type (die, cu);
14311 domain = die_containing_type (die, cu);
14313 /* The calls above may have already set the type for this DIE. */
14314 type = get_die_type (die, cu);
14318 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
14319 type = lookup_methodptr_type (to_type);
14320 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
14322 struct type *new_type = alloc_type (cu->objfile);
14324 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
14325 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
14326 TYPE_VARARGS (to_type));
14327 type = lookup_methodptr_type (new_type);
14330 type = lookup_memberptr_type (to_type, domain);
14332 return set_die_type (die, type, cu);
14335 /* Extract all information from a DW_TAG_reference_type DIE and add to
14336 the user defined type vector. */
14338 static struct type *
14339 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
14341 struct comp_unit_head *cu_header = &cu->header;
14342 struct type *type, *target_type;
14343 struct attribute *attr;
14345 target_type = die_type (die, cu);
14347 /* The die_type call above may have already set the type for this DIE. */
14348 type = get_die_type (die, cu);
14352 type = lookup_reference_type (target_type);
14353 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14356 TYPE_LENGTH (type) = DW_UNSND (attr);
14360 TYPE_LENGTH (type) = cu_header->addr_size;
14362 return set_die_type (die, type, cu);
14365 /* Add the given cv-qualifiers to the element type of the array. GCC
14366 outputs DWARF type qualifiers that apply to an array, not the
14367 element type. But GDB relies on the array element type to carry
14368 the cv-qualifiers. This mimics section 6.7.3 of the C99
14371 static struct type *
14372 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
14373 struct type *base_type, int cnst, int voltl)
14375 struct type *el_type, *inner_array;
14377 base_type = copy_type (base_type);
14378 inner_array = base_type;
14380 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
14382 TYPE_TARGET_TYPE (inner_array) =
14383 copy_type (TYPE_TARGET_TYPE (inner_array));
14384 inner_array = TYPE_TARGET_TYPE (inner_array);
14387 el_type = TYPE_TARGET_TYPE (inner_array);
14388 cnst |= TYPE_CONST (el_type);
14389 voltl |= TYPE_VOLATILE (el_type);
14390 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
14392 return set_die_type (die, base_type, cu);
14395 static struct type *
14396 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
14398 struct type *base_type, *cv_type;
14400 base_type = die_type (die, cu);
14402 /* The die_type call above may have already set the type for this DIE. */
14403 cv_type = get_die_type (die, cu);
14407 /* In case the const qualifier is applied to an array type, the element type
14408 is so qualified, not the array type (section 6.7.3 of C99). */
14409 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14410 return add_array_cv_type (die, cu, base_type, 1, 0);
14412 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
14413 return set_die_type (die, cv_type, cu);
14416 static struct type *
14417 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
14419 struct type *base_type, *cv_type;
14421 base_type = die_type (die, cu);
14423 /* The die_type call above may have already set the type for this DIE. */
14424 cv_type = get_die_type (die, cu);
14428 /* In case the volatile qualifier is applied to an array type, the
14429 element type is so qualified, not the array type (section 6.7.3
14431 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14432 return add_array_cv_type (die, cu, base_type, 0, 1);
14434 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
14435 return set_die_type (die, cv_type, cu);
14438 /* Handle DW_TAG_restrict_type. */
14440 static struct type *
14441 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
14443 struct type *base_type, *cv_type;
14445 base_type = die_type (die, cu);
14447 /* The die_type call above may have already set the type for this DIE. */
14448 cv_type = get_die_type (die, cu);
14452 cv_type = make_restrict_type (base_type);
14453 return set_die_type (die, cv_type, cu);
14456 /* Handle DW_TAG_atomic_type. */
14458 static struct type *
14459 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
14461 struct type *base_type, *cv_type;
14463 base_type = die_type (die, cu);
14465 /* The die_type call above may have already set the type for this DIE. */
14466 cv_type = get_die_type (die, cu);
14470 cv_type = make_atomic_type (base_type);
14471 return set_die_type (die, cv_type, cu);
14474 /* Extract all information from a DW_TAG_string_type DIE and add to
14475 the user defined type vector. It isn't really a user defined type,
14476 but it behaves like one, with other DIE's using an AT_user_def_type
14477 attribute to reference it. */
14479 static struct type *
14480 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
14482 struct objfile *objfile = cu->objfile;
14483 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14484 struct type *type, *range_type, *index_type, *char_type;
14485 struct attribute *attr;
14486 unsigned int length;
14488 attr = dwarf2_attr (die, DW_AT_string_length, cu);
14491 length = DW_UNSND (attr);
14495 /* Check for the DW_AT_byte_size attribute. */
14496 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14499 length = DW_UNSND (attr);
14507 index_type = objfile_type (objfile)->builtin_int;
14508 range_type = create_static_range_type (NULL, index_type, 1, length);
14509 char_type = language_string_char_type (cu->language_defn, gdbarch);
14510 type = create_string_type (NULL, char_type, range_type);
14512 return set_die_type (die, type, cu);
14515 /* Assuming that DIE corresponds to a function, returns nonzero
14516 if the function is prototyped. */
14519 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
14521 struct attribute *attr;
14523 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
14524 if (attr && (DW_UNSND (attr) != 0))
14527 /* The DWARF standard implies that the DW_AT_prototyped attribute
14528 is only meaninful for C, but the concept also extends to other
14529 languages that allow unprototyped functions (Eg: Objective C).
14530 For all other languages, assume that functions are always
14532 if (cu->language != language_c
14533 && cu->language != language_objc
14534 && cu->language != language_opencl)
14537 /* RealView does not emit DW_AT_prototyped. We can not distinguish
14538 prototyped and unprototyped functions; default to prototyped,
14539 since that is more common in modern code (and RealView warns
14540 about unprototyped functions). */
14541 if (producer_is_realview (cu->producer))
14547 /* Handle DIES due to C code like:
14551 int (*funcp)(int a, long l);
14555 ('funcp' generates a DW_TAG_subroutine_type DIE). */
14557 static struct type *
14558 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
14560 struct objfile *objfile = cu->objfile;
14561 struct type *type; /* Type that this function returns. */
14562 struct type *ftype; /* Function that returns above type. */
14563 struct attribute *attr;
14565 type = die_type (die, cu);
14567 /* The die_type call above may have already set the type for this DIE. */
14568 ftype = get_die_type (die, cu);
14572 ftype = lookup_function_type (type);
14574 if (prototyped_function_p (die, cu))
14575 TYPE_PROTOTYPED (ftype) = 1;
14577 /* Store the calling convention in the type if it's available in
14578 the subroutine die. Otherwise set the calling convention to
14579 the default value DW_CC_normal. */
14580 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
14582 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
14583 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
14584 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
14586 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
14588 /* Record whether the function returns normally to its caller or not
14589 if the DWARF producer set that information. */
14590 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
14591 if (attr && (DW_UNSND (attr) != 0))
14592 TYPE_NO_RETURN (ftype) = 1;
14594 /* We need to add the subroutine type to the die immediately so
14595 we don't infinitely recurse when dealing with parameters
14596 declared as the same subroutine type. */
14597 set_die_type (die, ftype, cu);
14599 if (die->child != NULL)
14601 struct type *void_type = objfile_type (objfile)->builtin_void;
14602 struct die_info *child_die;
14603 int nparams, iparams;
14605 /* Count the number of parameters.
14606 FIXME: GDB currently ignores vararg functions, but knows about
14607 vararg member functions. */
14609 child_die = die->child;
14610 while (child_die && child_die->tag)
14612 if (child_die->tag == DW_TAG_formal_parameter)
14614 else if (child_die->tag == DW_TAG_unspecified_parameters)
14615 TYPE_VARARGS (ftype) = 1;
14616 child_die = sibling_die (child_die);
14619 /* Allocate storage for parameters and fill them in. */
14620 TYPE_NFIELDS (ftype) = nparams;
14621 TYPE_FIELDS (ftype) = (struct field *)
14622 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
14624 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
14625 even if we error out during the parameters reading below. */
14626 for (iparams = 0; iparams < nparams; iparams++)
14627 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
14630 child_die = die->child;
14631 while (child_die && child_die->tag)
14633 if (child_die->tag == DW_TAG_formal_parameter)
14635 struct type *arg_type;
14637 /* DWARF version 2 has no clean way to discern C++
14638 static and non-static member functions. G++ helps
14639 GDB by marking the first parameter for non-static
14640 member functions (which is the this pointer) as
14641 artificial. We pass this information to
14642 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
14644 DWARF version 3 added DW_AT_object_pointer, which GCC
14645 4.5 does not yet generate. */
14646 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
14648 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
14650 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
14651 arg_type = die_type (child_die, cu);
14653 /* RealView does not mark THIS as const, which the testsuite
14654 expects. GCC marks THIS as const in method definitions,
14655 but not in the class specifications (GCC PR 43053). */
14656 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
14657 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
14660 struct dwarf2_cu *arg_cu = cu;
14661 const char *name = dwarf2_name (child_die, cu);
14663 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
14666 /* If the compiler emits this, use it. */
14667 if (follow_die_ref (die, attr, &arg_cu) == child_die)
14670 else if (name && strcmp (name, "this") == 0)
14671 /* Function definitions will have the argument names. */
14673 else if (name == NULL && iparams == 0)
14674 /* Declarations may not have the names, so like
14675 elsewhere in GDB, assume an artificial first
14676 argument is "this". */
14680 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
14684 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
14687 child_die = sibling_die (child_die);
14694 static struct type *
14695 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
14697 struct objfile *objfile = cu->objfile;
14698 const char *name = NULL;
14699 struct type *this_type, *target_type;
14701 name = dwarf2_full_name (NULL, die, cu);
14702 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
14703 TYPE_TARGET_STUB (this_type) = 1;
14704 set_die_type (die, this_type, cu);
14705 target_type = die_type (die, cu);
14706 if (target_type != this_type)
14707 TYPE_TARGET_TYPE (this_type) = target_type;
14710 /* Self-referential typedefs are, it seems, not allowed by the DWARF
14711 spec and cause infinite loops in GDB. */
14712 complaint (&symfile_complaints,
14713 _("Self-referential DW_TAG_typedef "
14714 "- DIE at 0x%x [in module %s]"),
14715 die->offset.sect_off, objfile_name (objfile));
14716 TYPE_TARGET_TYPE (this_type) = NULL;
14721 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
14722 (which may be different from NAME) to the architecture back-end to allow
14723 it to guess the correct format if necessary. */
14725 static struct type *
14726 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
14727 const char *name_hint)
14729 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14730 const struct floatformat **format;
14733 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
14735 type = init_float_type (objfile, bits, name, format);
14737 type = init_type (objfile, TYPE_CODE_ERROR, bits / TARGET_CHAR_BIT, name);
14742 /* Find a representation of a given base type and install
14743 it in the TYPE field of the die. */
14745 static struct type *
14746 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
14748 struct objfile *objfile = cu->objfile;
14750 struct attribute *attr;
14751 int encoding = 0, bits = 0;
14754 attr = dwarf2_attr (die, DW_AT_encoding, cu);
14757 encoding = DW_UNSND (attr);
14759 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14762 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
14764 name = dwarf2_name (die, cu);
14767 complaint (&symfile_complaints,
14768 _("DW_AT_name missing from DW_TAG_base_type"));
14773 case DW_ATE_address:
14774 /* Turn DW_ATE_address into a void * pointer. */
14775 type = init_type (objfile, TYPE_CODE_VOID, 1, NULL);
14776 type = init_pointer_type (objfile, bits, name, type);
14778 case DW_ATE_boolean:
14779 type = init_boolean_type (objfile, bits, 1, name);
14781 case DW_ATE_complex_float:
14782 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
14783 type = init_complex_type (objfile, name, type);
14785 case DW_ATE_decimal_float:
14786 type = init_decfloat_type (objfile, bits, name);
14789 type = dwarf2_init_float_type (objfile, bits, name, name);
14791 case DW_ATE_signed:
14792 type = init_integer_type (objfile, bits, 0, name);
14794 case DW_ATE_unsigned:
14795 if (cu->language == language_fortran
14797 && startswith (name, "character("))
14798 type = init_character_type (objfile, bits, 1, name);
14800 type = init_integer_type (objfile, bits, 1, name);
14802 case DW_ATE_signed_char:
14803 if (cu->language == language_ada || cu->language == language_m2
14804 || cu->language == language_pascal
14805 || cu->language == language_fortran)
14806 type = init_character_type (objfile, bits, 0, name);
14808 type = init_integer_type (objfile, bits, 0, name);
14810 case DW_ATE_unsigned_char:
14811 if (cu->language == language_ada || cu->language == language_m2
14812 || cu->language == language_pascal
14813 || cu->language == language_fortran
14814 || cu->language == language_rust)
14815 type = init_character_type (objfile, bits, 1, name);
14817 type = init_integer_type (objfile, bits, 1, name);
14820 /* We just treat this as an integer and then recognize the
14821 type by name elsewhere. */
14822 type = init_integer_type (objfile, bits, 0, name);
14826 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
14827 dwarf_type_encoding_name (encoding));
14828 type = init_type (objfile, TYPE_CODE_ERROR,
14829 bits / TARGET_CHAR_BIT, name);
14833 if (name && strcmp (name, "char") == 0)
14834 TYPE_NOSIGN (type) = 1;
14836 return set_die_type (die, type, cu);
14839 /* Parse dwarf attribute if it's a block, reference or constant and put the
14840 resulting value of the attribute into struct bound_prop.
14841 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
14844 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
14845 struct dwarf2_cu *cu, struct dynamic_prop *prop)
14847 struct dwarf2_property_baton *baton;
14848 struct obstack *obstack = &cu->objfile->objfile_obstack;
14850 if (attr == NULL || prop == NULL)
14853 if (attr_form_is_block (attr))
14855 baton = XOBNEW (obstack, struct dwarf2_property_baton);
14856 baton->referenced_type = NULL;
14857 baton->locexpr.per_cu = cu->per_cu;
14858 baton->locexpr.size = DW_BLOCK (attr)->size;
14859 baton->locexpr.data = DW_BLOCK (attr)->data;
14860 prop->data.baton = baton;
14861 prop->kind = PROP_LOCEXPR;
14862 gdb_assert (prop->data.baton != NULL);
14864 else if (attr_form_is_ref (attr))
14866 struct dwarf2_cu *target_cu = cu;
14867 struct die_info *target_die;
14868 struct attribute *target_attr;
14870 target_die = follow_die_ref (die, attr, &target_cu);
14871 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
14872 if (target_attr == NULL)
14873 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
14875 if (target_attr == NULL)
14878 switch (target_attr->name)
14880 case DW_AT_location:
14881 if (attr_form_is_section_offset (target_attr))
14883 baton = XOBNEW (obstack, struct dwarf2_property_baton);
14884 baton->referenced_type = die_type (target_die, target_cu);
14885 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
14886 prop->data.baton = baton;
14887 prop->kind = PROP_LOCLIST;
14888 gdb_assert (prop->data.baton != NULL);
14890 else if (attr_form_is_block (target_attr))
14892 baton = XOBNEW (obstack, struct dwarf2_property_baton);
14893 baton->referenced_type = die_type (target_die, target_cu);
14894 baton->locexpr.per_cu = cu->per_cu;
14895 baton->locexpr.size = DW_BLOCK (target_attr)->size;
14896 baton->locexpr.data = DW_BLOCK (target_attr)->data;
14897 prop->data.baton = baton;
14898 prop->kind = PROP_LOCEXPR;
14899 gdb_assert (prop->data.baton != NULL);
14903 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14904 "dynamic property");
14908 case DW_AT_data_member_location:
14912 if (!handle_data_member_location (target_die, target_cu,
14916 baton = XOBNEW (obstack, struct dwarf2_property_baton);
14917 baton->referenced_type = read_type_die (target_die->parent,
14919 baton->offset_info.offset = offset;
14920 baton->offset_info.type = die_type (target_die, target_cu);
14921 prop->data.baton = baton;
14922 prop->kind = PROP_ADDR_OFFSET;
14927 else if (attr_form_is_constant (attr))
14929 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
14930 prop->kind = PROP_CONST;
14934 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
14935 dwarf2_name (die, cu));
14942 /* Read the given DW_AT_subrange DIE. */
14944 static struct type *
14945 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
14947 struct type *base_type, *orig_base_type;
14948 struct type *range_type;
14949 struct attribute *attr;
14950 struct dynamic_prop low, high;
14951 int low_default_is_valid;
14952 int high_bound_is_count = 0;
14954 LONGEST negative_mask;
14956 orig_base_type = die_type (die, cu);
14957 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
14958 whereas the real type might be. So, we use ORIG_BASE_TYPE when
14959 creating the range type, but we use the result of check_typedef
14960 when examining properties of the type. */
14961 base_type = check_typedef (orig_base_type);
14963 /* The die_type call above may have already set the type for this DIE. */
14964 range_type = get_die_type (die, cu);
14968 low.kind = PROP_CONST;
14969 high.kind = PROP_CONST;
14970 high.data.const_val = 0;
14972 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
14973 omitting DW_AT_lower_bound. */
14974 switch (cu->language)
14977 case language_cplus:
14978 low.data.const_val = 0;
14979 low_default_is_valid = 1;
14981 case language_fortran:
14982 low.data.const_val = 1;
14983 low_default_is_valid = 1;
14986 case language_objc:
14987 case language_rust:
14988 low.data.const_val = 0;
14989 low_default_is_valid = (cu->header.version >= 4);
14993 case language_pascal:
14994 low.data.const_val = 1;
14995 low_default_is_valid = (cu->header.version >= 4);
14998 low.data.const_val = 0;
14999 low_default_is_valid = 0;
15003 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
15005 attr_to_dynamic_prop (attr, die, cu, &low);
15006 else if (!low_default_is_valid)
15007 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
15008 "- DIE at 0x%x [in module %s]"),
15009 die->offset.sect_off, objfile_name (cu->objfile));
15011 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
15012 if (!attr_to_dynamic_prop (attr, die, cu, &high))
15014 attr = dwarf2_attr (die, DW_AT_count, cu);
15015 if (attr_to_dynamic_prop (attr, die, cu, &high))
15017 /* If bounds are constant do the final calculation here. */
15018 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
15019 high.data.const_val = low.data.const_val + high.data.const_val - 1;
15021 high_bound_is_count = 1;
15025 /* Dwarf-2 specifications explicitly allows to create subrange types
15026 without specifying a base type.
15027 In that case, the base type must be set to the type of
15028 the lower bound, upper bound or count, in that order, if any of these
15029 three attributes references an object that has a type.
15030 If no base type is found, the Dwarf-2 specifications say that
15031 a signed integer type of size equal to the size of an address should
15033 For the following C code: `extern char gdb_int [];'
15034 GCC produces an empty range DIE.
15035 FIXME: muller/2010-05-28: Possible references to object for low bound,
15036 high bound or count are not yet handled by this code. */
15037 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
15039 struct objfile *objfile = cu->objfile;
15040 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15041 int addr_size = gdbarch_addr_bit (gdbarch) /8;
15042 struct type *int_type = objfile_type (objfile)->builtin_int;
15044 /* Test "int", "long int", and "long long int" objfile types,
15045 and select the first one having a size above or equal to the
15046 architecture address size. */
15047 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15048 base_type = int_type;
15051 int_type = objfile_type (objfile)->builtin_long;
15052 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15053 base_type = int_type;
15056 int_type = objfile_type (objfile)->builtin_long_long;
15057 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15058 base_type = int_type;
15063 /* Normally, the DWARF producers are expected to use a signed
15064 constant form (Eg. DW_FORM_sdata) to express negative bounds.
15065 But this is unfortunately not always the case, as witnessed
15066 with GCC, for instance, where the ambiguous DW_FORM_dataN form
15067 is used instead. To work around that ambiguity, we treat
15068 the bounds as signed, and thus sign-extend their values, when
15069 the base type is signed. */
15071 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
15072 if (low.kind == PROP_CONST
15073 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
15074 low.data.const_val |= negative_mask;
15075 if (high.kind == PROP_CONST
15076 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
15077 high.data.const_val |= negative_mask;
15079 range_type = create_range_type (NULL, orig_base_type, &low, &high);
15081 if (high_bound_is_count)
15082 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
15084 /* Ada expects an empty array on no boundary attributes. */
15085 if (attr == NULL && cu->language != language_ada)
15086 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
15088 name = dwarf2_name (die, cu);
15090 TYPE_NAME (range_type) = name;
15092 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15094 TYPE_LENGTH (range_type) = DW_UNSND (attr);
15096 set_die_type (die, range_type, cu);
15098 /* set_die_type should be already done. */
15099 set_descriptive_type (range_type, die, cu);
15104 static struct type *
15105 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
15109 /* For now, we only support the C meaning of an unspecified type: void. */
15111 type = init_type (cu->objfile, TYPE_CODE_VOID, 0, NULL);
15112 TYPE_NAME (type) = dwarf2_name (die, cu);
15114 return set_die_type (die, type, cu);
15117 /* Read a single die and all its descendents. Set the die's sibling
15118 field to NULL; set other fields in the die correctly, and set all
15119 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
15120 location of the info_ptr after reading all of those dies. PARENT
15121 is the parent of the die in question. */
15123 static struct die_info *
15124 read_die_and_children (const struct die_reader_specs *reader,
15125 const gdb_byte *info_ptr,
15126 const gdb_byte **new_info_ptr,
15127 struct die_info *parent)
15129 struct die_info *die;
15130 const gdb_byte *cur_ptr;
15133 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
15136 *new_info_ptr = cur_ptr;
15139 store_in_ref_table (die, reader->cu);
15142 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
15146 *new_info_ptr = cur_ptr;
15149 die->sibling = NULL;
15150 die->parent = parent;
15154 /* Read a die, all of its descendents, and all of its siblings; set
15155 all of the fields of all of the dies correctly. Arguments are as
15156 in read_die_and_children. */
15158 static struct die_info *
15159 read_die_and_siblings_1 (const struct die_reader_specs *reader,
15160 const gdb_byte *info_ptr,
15161 const gdb_byte **new_info_ptr,
15162 struct die_info *parent)
15164 struct die_info *first_die, *last_sibling;
15165 const gdb_byte *cur_ptr;
15167 cur_ptr = info_ptr;
15168 first_die = last_sibling = NULL;
15172 struct die_info *die
15173 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
15177 *new_info_ptr = cur_ptr;
15184 last_sibling->sibling = die;
15186 last_sibling = die;
15190 /* Read a die, all of its descendents, and all of its siblings; set
15191 all of the fields of all of the dies correctly. Arguments are as
15192 in read_die_and_children.
15193 This the main entry point for reading a DIE and all its children. */
15195 static struct die_info *
15196 read_die_and_siblings (const struct die_reader_specs *reader,
15197 const gdb_byte *info_ptr,
15198 const gdb_byte **new_info_ptr,
15199 struct die_info *parent)
15201 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
15202 new_info_ptr, parent);
15204 if (dwarf_die_debug)
15206 fprintf_unfiltered (gdb_stdlog,
15207 "Read die from %s@0x%x of %s:\n",
15208 get_section_name (reader->die_section),
15209 (unsigned) (info_ptr - reader->die_section->buffer),
15210 bfd_get_filename (reader->abfd));
15211 dump_die (die, dwarf_die_debug);
15217 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
15219 The caller is responsible for filling in the extra attributes
15220 and updating (*DIEP)->num_attrs.
15221 Set DIEP to point to a newly allocated die with its information,
15222 except for its child, sibling, and parent fields.
15223 Set HAS_CHILDREN to tell whether the die has children or not. */
15225 static const gdb_byte *
15226 read_full_die_1 (const struct die_reader_specs *reader,
15227 struct die_info **diep, const gdb_byte *info_ptr,
15228 int *has_children, int num_extra_attrs)
15230 unsigned int abbrev_number, bytes_read, i;
15231 sect_offset offset;
15232 struct abbrev_info *abbrev;
15233 struct die_info *die;
15234 struct dwarf2_cu *cu = reader->cu;
15235 bfd *abfd = reader->abfd;
15237 offset.sect_off = info_ptr - reader->buffer;
15238 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15239 info_ptr += bytes_read;
15240 if (!abbrev_number)
15247 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
15249 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
15251 bfd_get_filename (abfd));
15253 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
15254 die->offset = offset;
15255 die->tag = abbrev->tag;
15256 die->abbrev = abbrev_number;
15258 /* Make the result usable.
15259 The caller needs to update num_attrs after adding the extra
15261 die->num_attrs = abbrev->num_attrs;
15263 for (i = 0; i < abbrev->num_attrs; ++i)
15264 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
15268 *has_children = abbrev->has_children;
15272 /* Read a die and all its attributes.
15273 Set DIEP to point to a newly allocated die with its information,
15274 except for its child, sibling, and parent fields.
15275 Set HAS_CHILDREN to tell whether the die has children or not. */
15277 static const gdb_byte *
15278 read_full_die (const struct die_reader_specs *reader,
15279 struct die_info **diep, const gdb_byte *info_ptr,
15282 const gdb_byte *result;
15284 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
15286 if (dwarf_die_debug)
15288 fprintf_unfiltered (gdb_stdlog,
15289 "Read die from %s@0x%x of %s:\n",
15290 get_section_name (reader->die_section),
15291 (unsigned) (info_ptr - reader->die_section->buffer),
15292 bfd_get_filename (reader->abfd));
15293 dump_die (*diep, dwarf_die_debug);
15299 /* Abbreviation tables.
15301 In DWARF version 2, the description of the debugging information is
15302 stored in a separate .debug_abbrev section. Before we read any
15303 dies from a section we read in all abbreviations and install them
15304 in a hash table. */
15306 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
15308 static struct abbrev_info *
15309 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
15311 struct abbrev_info *abbrev;
15313 abbrev = XOBNEW (&abbrev_table->abbrev_obstack, struct abbrev_info);
15314 memset (abbrev, 0, sizeof (struct abbrev_info));
15319 /* Add an abbreviation to the table. */
15322 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
15323 unsigned int abbrev_number,
15324 struct abbrev_info *abbrev)
15326 unsigned int hash_number;
15328 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15329 abbrev->next = abbrev_table->abbrevs[hash_number];
15330 abbrev_table->abbrevs[hash_number] = abbrev;
15333 /* Look up an abbrev in the table.
15334 Returns NULL if the abbrev is not found. */
15336 static struct abbrev_info *
15337 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
15338 unsigned int abbrev_number)
15340 unsigned int hash_number;
15341 struct abbrev_info *abbrev;
15343 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15344 abbrev = abbrev_table->abbrevs[hash_number];
15348 if (abbrev->number == abbrev_number)
15350 abbrev = abbrev->next;
15355 /* Read in an abbrev table. */
15357 static struct abbrev_table *
15358 abbrev_table_read_table (struct dwarf2_section_info *section,
15359 sect_offset offset)
15361 struct objfile *objfile = dwarf2_per_objfile->objfile;
15362 bfd *abfd = get_section_bfd_owner (section);
15363 struct abbrev_table *abbrev_table;
15364 const gdb_byte *abbrev_ptr;
15365 struct abbrev_info *cur_abbrev;
15366 unsigned int abbrev_number, bytes_read, abbrev_name;
15367 unsigned int abbrev_form;
15368 struct attr_abbrev *cur_attrs;
15369 unsigned int allocated_attrs;
15371 abbrev_table = XNEW (struct abbrev_table);
15372 abbrev_table->offset = offset;
15373 obstack_init (&abbrev_table->abbrev_obstack);
15374 abbrev_table->abbrevs =
15375 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct abbrev_info *,
15377 memset (abbrev_table->abbrevs, 0,
15378 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
15380 dwarf2_read_section (objfile, section);
15381 abbrev_ptr = section->buffer + offset.sect_off;
15382 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15383 abbrev_ptr += bytes_read;
15385 allocated_attrs = ATTR_ALLOC_CHUNK;
15386 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
15388 /* Loop until we reach an abbrev number of 0. */
15389 while (abbrev_number)
15391 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
15393 /* read in abbrev header */
15394 cur_abbrev->number = abbrev_number;
15396 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15397 abbrev_ptr += bytes_read;
15398 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
15401 /* now read in declarations */
15402 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15403 abbrev_ptr += bytes_read;
15404 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15405 abbrev_ptr += bytes_read;
15406 while (abbrev_name)
15408 if (cur_abbrev->num_attrs == allocated_attrs)
15410 allocated_attrs += ATTR_ALLOC_CHUNK;
15412 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
15415 cur_attrs[cur_abbrev->num_attrs].name
15416 = (enum dwarf_attribute) abbrev_name;
15417 cur_attrs[cur_abbrev->num_attrs++].form
15418 = (enum dwarf_form) abbrev_form;
15419 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15420 abbrev_ptr += bytes_read;
15421 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15422 abbrev_ptr += bytes_read;
15425 cur_abbrev->attrs =
15426 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
15427 cur_abbrev->num_attrs);
15428 memcpy (cur_abbrev->attrs, cur_attrs,
15429 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
15431 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
15433 /* Get next abbreviation.
15434 Under Irix6 the abbreviations for a compilation unit are not
15435 always properly terminated with an abbrev number of 0.
15436 Exit loop if we encounter an abbreviation which we have
15437 already read (which means we are about to read the abbreviations
15438 for the next compile unit) or if the end of the abbreviation
15439 table is reached. */
15440 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
15442 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15443 abbrev_ptr += bytes_read;
15444 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
15449 return abbrev_table;
15452 /* Free the resources held by ABBREV_TABLE. */
15455 abbrev_table_free (struct abbrev_table *abbrev_table)
15457 obstack_free (&abbrev_table->abbrev_obstack, NULL);
15458 xfree (abbrev_table);
15461 /* Same as abbrev_table_free but as a cleanup.
15462 We pass in a pointer to the pointer to the table so that we can
15463 set the pointer to NULL when we're done. It also simplifies
15464 build_type_psymtabs_1. */
15467 abbrev_table_free_cleanup (void *table_ptr)
15469 struct abbrev_table **abbrev_table_ptr = (struct abbrev_table **) table_ptr;
15471 if (*abbrev_table_ptr != NULL)
15472 abbrev_table_free (*abbrev_table_ptr);
15473 *abbrev_table_ptr = NULL;
15476 /* Read the abbrev table for CU from ABBREV_SECTION. */
15479 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
15480 struct dwarf2_section_info *abbrev_section)
15483 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
15486 /* Release the memory used by the abbrev table for a compilation unit. */
15489 dwarf2_free_abbrev_table (void *ptr_to_cu)
15491 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr_to_cu;
15493 if (cu->abbrev_table != NULL)
15494 abbrev_table_free (cu->abbrev_table);
15495 /* Set this to NULL so that we SEGV if we try to read it later,
15496 and also because free_comp_unit verifies this is NULL. */
15497 cu->abbrev_table = NULL;
15500 /* Returns nonzero if TAG represents a type that we might generate a partial
15504 is_type_tag_for_partial (int tag)
15509 /* Some types that would be reasonable to generate partial symbols for,
15510 that we don't at present. */
15511 case DW_TAG_array_type:
15512 case DW_TAG_file_type:
15513 case DW_TAG_ptr_to_member_type:
15514 case DW_TAG_set_type:
15515 case DW_TAG_string_type:
15516 case DW_TAG_subroutine_type:
15518 case DW_TAG_base_type:
15519 case DW_TAG_class_type:
15520 case DW_TAG_interface_type:
15521 case DW_TAG_enumeration_type:
15522 case DW_TAG_structure_type:
15523 case DW_TAG_subrange_type:
15524 case DW_TAG_typedef:
15525 case DW_TAG_union_type:
15532 /* Load all DIEs that are interesting for partial symbols into memory. */
15534 static struct partial_die_info *
15535 load_partial_dies (const struct die_reader_specs *reader,
15536 const gdb_byte *info_ptr, int building_psymtab)
15538 struct dwarf2_cu *cu = reader->cu;
15539 struct objfile *objfile = cu->objfile;
15540 struct partial_die_info *part_die;
15541 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
15542 struct abbrev_info *abbrev;
15543 unsigned int bytes_read;
15544 unsigned int load_all = 0;
15545 int nesting_level = 1;
15550 gdb_assert (cu->per_cu != NULL);
15551 if (cu->per_cu->load_all_dies)
15555 = htab_create_alloc_ex (cu->header.length / 12,
15559 &cu->comp_unit_obstack,
15560 hashtab_obstack_allocate,
15561 dummy_obstack_deallocate);
15563 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
15567 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
15569 /* A NULL abbrev means the end of a series of children. */
15570 if (abbrev == NULL)
15572 if (--nesting_level == 0)
15574 /* PART_DIE was probably the last thing allocated on the
15575 comp_unit_obstack, so we could call obstack_free
15576 here. We don't do that because the waste is small,
15577 and will be cleaned up when we're done with this
15578 compilation unit. This way, we're also more robust
15579 against other users of the comp_unit_obstack. */
15582 info_ptr += bytes_read;
15583 last_die = parent_die;
15584 parent_die = parent_die->die_parent;
15588 /* Check for template arguments. We never save these; if
15589 they're seen, we just mark the parent, and go on our way. */
15590 if (parent_die != NULL
15591 && cu->language == language_cplus
15592 && (abbrev->tag == DW_TAG_template_type_param
15593 || abbrev->tag == DW_TAG_template_value_param))
15595 parent_die->has_template_arguments = 1;
15599 /* We don't need a partial DIE for the template argument. */
15600 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15605 /* We only recurse into c++ subprograms looking for template arguments.
15606 Skip their other children. */
15608 && cu->language == language_cplus
15609 && parent_die != NULL
15610 && parent_die->tag == DW_TAG_subprogram)
15612 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15616 /* Check whether this DIE is interesting enough to save. Normally
15617 we would not be interested in members here, but there may be
15618 later variables referencing them via DW_AT_specification (for
15619 static members). */
15621 && !is_type_tag_for_partial (abbrev->tag)
15622 && abbrev->tag != DW_TAG_constant
15623 && abbrev->tag != DW_TAG_enumerator
15624 && abbrev->tag != DW_TAG_subprogram
15625 && abbrev->tag != DW_TAG_lexical_block
15626 && abbrev->tag != DW_TAG_variable
15627 && abbrev->tag != DW_TAG_namespace
15628 && abbrev->tag != DW_TAG_module
15629 && abbrev->tag != DW_TAG_member
15630 && abbrev->tag != DW_TAG_imported_unit
15631 && abbrev->tag != DW_TAG_imported_declaration)
15633 /* Otherwise we skip to the next sibling, if any. */
15634 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
15638 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
15641 /* This two-pass algorithm for processing partial symbols has a
15642 high cost in cache pressure. Thus, handle some simple cases
15643 here which cover the majority of C partial symbols. DIEs
15644 which neither have specification tags in them, nor could have
15645 specification tags elsewhere pointing at them, can simply be
15646 processed and discarded.
15648 This segment is also optional; scan_partial_symbols and
15649 add_partial_symbol will handle these DIEs if we chain
15650 them in normally. When compilers which do not emit large
15651 quantities of duplicate debug information are more common,
15652 this code can probably be removed. */
15654 /* Any complete simple types at the top level (pretty much all
15655 of them, for a language without namespaces), can be processed
15657 if (parent_die == NULL
15658 && part_die->has_specification == 0
15659 && part_die->is_declaration == 0
15660 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
15661 || part_die->tag == DW_TAG_base_type
15662 || part_die->tag == DW_TAG_subrange_type))
15664 if (building_psymtab && part_die->name != NULL)
15665 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
15666 VAR_DOMAIN, LOC_TYPEDEF,
15667 &objfile->static_psymbols,
15668 0, cu->language, objfile);
15669 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
15673 /* The exception for DW_TAG_typedef with has_children above is
15674 a workaround of GCC PR debug/47510. In the case of this complaint
15675 type_name_no_tag_or_error will error on such types later.
15677 GDB skipped children of DW_TAG_typedef by the shortcut above and then
15678 it could not find the child DIEs referenced later, this is checked
15679 above. In correct DWARF DW_TAG_typedef should have no children. */
15681 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
15682 complaint (&symfile_complaints,
15683 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
15684 "- DIE at 0x%x [in module %s]"),
15685 part_die->offset.sect_off, objfile_name (objfile));
15687 /* If we're at the second level, and we're an enumerator, and
15688 our parent has no specification (meaning possibly lives in a
15689 namespace elsewhere), then we can add the partial symbol now
15690 instead of queueing it. */
15691 if (part_die->tag == DW_TAG_enumerator
15692 && parent_die != NULL
15693 && parent_die->die_parent == NULL
15694 && parent_die->tag == DW_TAG_enumeration_type
15695 && parent_die->has_specification == 0)
15697 if (part_die->name == NULL)
15698 complaint (&symfile_complaints,
15699 _("malformed enumerator DIE ignored"));
15700 else if (building_psymtab)
15701 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
15702 VAR_DOMAIN, LOC_CONST,
15703 cu->language == language_cplus
15704 ? &objfile->global_psymbols
15705 : &objfile->static_psymbols,
15706 0, cu->language, objfile);
15708 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
15712 /* We'll save this DIE so link it in. */
15713 part_die->die_parent = parent_die;
15714 part_die->die_sibling = NULL;
15715 part_die->die_child = NULL;
15717 if (last_die && last_die == parent_die)
15718 last_die->die_child = part_die;
15720 last_die->die_sibling = part_die;
15722 last_die = part_die;
15724 if (first_die == NULL)
15725 first_die = part_die;
15727 /* Maybe add the DIE to the hash table. Not all DIEs that we
15728 find interesting need to be in the hash table, because we
15729 also have the parent/sibling/child chains; only those that we
15730 might refer to by offset later during partial symbol reading.
15732 For now this means things that might have be the target of a
15733 DW_AT_specification, DW_AT_abstract_origin, or
15734 DW_AT_extension. DW_AT_extension will refer only to
15735 namespaces; DW_AT_abstract_origin refers to functions (and
15736 many things under the function DIE, but we do not recurse
15737 into function DIEs during partial symbol reading) and
15738 possibly variables as well; DW_AT_specification refers to
15739 declarations. Declarations ought to have the DW_AT_declaration
15740 flag. It happens that GCC forgets to put it in sometimes, but
15741 only for functions, not for types.
15743 Adding more things than necessary to the hash table is harmless
15744 except for the performance cost. Adding too few will result in
15745 wasted time in find_partial_die, when we reread the compilation
15746 unit with load_all_dies set. */
15749 || abbrev->tag == DW_TAG_constant
15750 || abbrev->tag == DW_TAG_subprogram
15751 || abbrev->tag == DW_TAG_variable
15752 || abbrev->tag == DW_TAG_namespace
15753 || part_die->is_declaration)
15757 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
15758 part_die->offset.sect_off, INSERT);
15762 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
15764 /* For some DIEs we want to follow their children (if any). For C
15765 we have no reason to follow the children of structures; for other
15766 languages we have to, so that we can get at method physnames
15767 to infer fully qualified class names, for DW_AT_specification,
15768 and for C++ template arguments. For C++, we also look one level
15769 inside functions to find template arguments (if the name of the
15770 function does not already contain the template arguments).
15772 For Ada, we need to scan the children of subprograms and lexical
15773 blocks as well because Ada allows the definition of nested
15774 entities that could be interesting for the debugger, such as
15775 nested subprograms for instance. */
15776 if (last_die->has_children
15778 || last_die->tag == DW_TAG_namespace
15779 || last_die->tag == DW_TAG_module
15780 || last_die->tag == DW_TAG_enumeration_type
15781 || (cu->language == language_cplus
15782 && last_die->tag == DW_TAG_subprogram
15783 && (last_die->name == NULL
15784 || strchr (last_die->name, '<') == NULL))
15785 || (cu->language != language_c
15786 && (last_die->tag == DW_TAG_class_type
15787 || last_die->tag == DW_TAG_interface_type
15788 || last_die->tag == DW_TAG_structure_type
15789 || last_die->tag == DW_TAG_union_type))
15790 || (cu->language == language_ada
15791 && (last_die->tag == DW_TAG_subprogram
15792 || last_die->tag == DW_TAG_lexical_block))))
15795 parent_die = last_die;
15799 /* Otherwise we skip to the next sibling, if any. */
15800 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
15802 /* Back to the top, do it again. */
15806 /* Read a minimal amount of information into the minimal die structure. */
15808 static const gdb_byte *
15809 read_partial_die (const struct die_reader_specs *reader,
15810 struct partial_die_info *part_die,
15811 struct abbrev_info *abbrev, unsigned int abbrev_len,
15812 const gdb_byte *info_ptr)
15814 struct dwarf2_cu *cu = reader->cu;
15815 struct objfile *objfile = cu->objfile;
15816 const gdb_byte *buffer = reader->buffer;
15818 struct attribute attr;
15819 int has_low_pc_attr = 0;
15820 int has_high_pc_attr = 0;
15821 int high_pc_relative = 0;
15823 memset (part_die, 0, sizeof (struct partial_die_info));
15825 part_die->offset.sect_off = info_ptr - buffer;
15827 info_ptr += abbrev_len;
15829 if (abbrev == NULL)
15832 part_die->tag = abbrev->tag;
15833 part_die->has_children = abbrev->has_children;
15835 for (i = 0; i < abbrev->num_attrs; ++i)
15837 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
15839 /* Store the data if it is of an attribute we want to keep in a
15840 partial symbol table. */
15844 switch (part_die->tag)
15846 case DW_TAG_compile_unit:
15847 case DW_TAG_partial_unit:
15848 case DW_TAG_type_unit:
15849 /* Compilation units have a DW_AT_name that is a filename, not
15850 a source language identifier. */
15851 case DW_TAG_enumeration_type:
15852 case DW_TAG_enumerator:
15853 /* These tags always have simple identifiers already; no need
15854 to canonicalize them. */
15855 part_die->name = DW_STRING (&attr);
15859 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
15860 &objfile->per_bfd->storage_obstack);
15864 case DW_AT_linkage_name:
15865 case DW_AT_MIPS_linkage_name:
15866 /* Note that both forms of linkage name might appear. We
15867 assume they will be the same, and we only store the last
15869 if (cu->language == language_ada)
15870 part_die->name = DW_STRING (&attr);
15871 part_die->linkage_name = DW_STRING (&attr);
15874 has_low_pc_attr = 1;
15875 part_die->lowpc = attr_value_as_address (&attr);
15877 case DW_AT_high_pc:
15878 has_high_pc_attr = 1;
15879 part_die->highpc = attr_value_as_address (&attr);
15880 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
15881 high_pc_relative = 1;
15883 case DW_AT_location:
15884 /* Support the .debug_loc offsets. */
15885 if (attr_form_is_block (&attr))
15887 part_die->d.locdesc = DW_BLOCK (&attr);
15889 else if (attr_form_is_section_offset (&attr))
15891 dwarf2_complex_location_expr_complaint ();
15895 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15896 "partial symbol information");
15899 case DW_AT_external:
15900 part_die->is_external = DW_UNSND (&attr);
15902 case DW_AT_declaration:
15903 part_die->is_declaration = DW_UNSND (&attr);
15906 part_die->has_type = 1;
15908 case DW_AT_abstract_origin:
15909 case DW_AT_specification:
15910 case DW_AT_extension:
15911 part_die->has_specification = 1;
15912 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
15913 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
15914 || cu->per_cu->is_dwz);
15916 case DW_AT_sibling:
15917 /* Ignore absolute siblings, they might point outside of
15918 the current compile unit. */
15919 if (attr.form == DW_FORM_ref_addr)
15920 complaint (&symfile_complaints,
15921 _("ignoring absolute DW_AT_sibling"));
15924 unsigned int off = dwarf2_get_ref_die_offset (&attr).sect_off;
15925 const gdb_byte *sibling_ptr = buffer + off;
15927 if (sibling_ptr < info_ptr)
15928 complaint (&symfile_complaints,
15929 _("DW_AT_sibling points backwards"));
15930 else if (sibling_ptr > reader->buffer_end)
15931 dwarf2_section_buffer_overflow_complaint (reader->die_section);
15933 part_die->sibling = sibling_ptr;
15936 case DW_AT_byte_size:
15937 part_die->has_byte_size = 1;
15939 case DW_AT_const_value:
15940 part_die->has_const_value = 1;
15942 case DW_AT_calling_convention:
15943 /* DWARF doesn't provide a way to identify a program's source-level
15944 entry point. DW_AT_calling_convention attributes are only meant
15945 to describe functions' calling conventions.
15947 However, because it's a necessary piece of information in
15948 Fortran, and because DW_CC_program is the only piece of debugging
15949 information whose definition refers to a 'main program' at all,
15950 several compilers have begun marking Fortran main programs with
15951 DW_CC_program --- even when those functions use the standard
15952 calling conventions.
15954 So until DWARF specifies a way to provide this information and
15955 compilers pick up the new representation, we'll support this
15957 if (DW_UNSND (&attr) == DW_CC_program
15958 && cu->language == language_fortran
15959 && part_die->name != NULL)
15960 set_objfile_main_name (objfile, part_die->name, language_fortran);
15963 if (DW_UNSND (&attr) == DW_INL_inlined
15964 || DW_UNSND (&attr) == DW_INL_declared_inlined)
15965 part_die->may_be_inlined = 1;
15969 if (part_die->tag == DW_TAG_imported_unit)
15971 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
15972 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
15973 || cu->per_cu->is_dwz);
15982 if (high_pc_relative)
15983 part_die->highpc += part_die->lowpc;
15985 if (has_low_pc_attr && has_high_pc_attr)
15987 /* When using the GNU linker, .gnu.linkonce. sections are used to
15988 eliminate duplicate copies of functions and vtables and such.
15989 The linker will arbitrarily choose one and discard the others.
15990 The AT_*_pc values for such functions refer to local labels in
15991 these sections. If the section from that file was discarded, the
15992 labels are not in the output, so the relocs get a value of 0.
15993 If this is a discarded function, mark the pc bounds as invalid,
15994 so that GDB will ignore it. */
15995 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
15997 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15999 complaint (&symfile_complaints,
16000 _("DW_AT_low_pc %s is zero "
16001 "for DIE at 0x%x [in module %s]"),
16002 paddress (gdbarch, part_die->lowpc),
16003 part_die->offset.sect_off, objfile_name (objfile));
16005 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
16006 else if (part_die->lowpc >= part_die->highpc)
16008 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16010 complaint (&symfile_complaints,
16011 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
16012 "for DIE at 0x%x [in module %s]"),
16013 paddress (gdbarch, part_die->lowpc),
16014 paddress (gdbarch, part_die->highpc),
16015 part_die->offset.sect_off, objfile_name (objfile));
16018 part_die->has_pc_info = 1;
16024 /* Find a cached partial DIE at OFFSET in CU. */
16026 static struct partial_die_info *
16027 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
16029 struct partial_die_info *lookup_die = NULL;
16030 struct partial_die_info part_die;
16032 part_die.offset = offset;
16033 lookup_die = ((struct partial_die_info *)
16034 htab_find_with_hash (cu->partial_dies, &part_die,
16040 /* Find a partial DIE at OFFSET, which may or may not be in CU,
16041 except in the case of .debug_types DIEs which do not reference
16042 outside their CU (they do however referencing other types via
16043 DW_FORM_ref_sig8). */
16045 static struct partial_die_info *
16046 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
16048 struct objfile *objfile = cu->objfile;
16049 struct dwarf2_per_cu_data *per_cu = NULL;
16050 struct partial_die_info *pd = NULL;
16052 if (offset_in_dwz == cu->per_cu->is_dwz
16053 && offset_in_cu_p (&cu->header, offset))
16055 pd = find_partial_die_in_comp_unit (offset, cu);
16058 /* We missed recording what we needed.
16059 Load all dies and try again. */
16060 per_cu = cu->per_cu;
16064 /* TUs don't reference other CUs/TUs (except via type signatures). */
16065 if (cu->per_cu->is_debug_types)
16067 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
16068 " external reference to offset 0x%lx [in module %s].\n"),
16069 (long) cu->header.offset.sect_off, (long) offset.sect_off,
16070 bfd_get_filename (objfile->obfd));
16072 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
16075 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
16076 load_partial_comp_unit (per_cu);
16078 per_cu->cu->last_used = 0;
16079 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
16082 /* If we didn't find it, and not all dies have been loaded,
16083 load them all and try again. */
16085 if (pd == NULL && per_cu->load_all_dies == 0)
16087 per_cu->load_all_dies = 1;
16089 /* This is nasty. When we reread the DIEs, somewhere up the call chain
16090 THIS_CU->cu may already be in use. So we can't just free it and
16091 replace its DIEs with the ones we read in. Instead, we leave those
16092 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
16093 and clobber THIS_CU->cu->partial_dies with the hash table for the new
16095 load_partial_comp_unit (per_cu);
16097 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
16101 internal_error (__FILE__, __LINE__,
16102 _("could not find partial DIE 0x%x "
16103 "in cache [from module %s]\n"),
16104 offset.sect_off, bfd_get_filename (objfile->obfd));
16108 /* See if we can figure out if the class lives in a namespace. We do
16109 this by looking for a member function; its demangled name will
16110 contain namespace info, if there is any. */
16113 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
16114 struct dwarf2_cu *cu)
16116 /* NOTE: carlton/2003-10-07: Getting the info this way changes
16117 what template types look like, because the demangler
16118 frequently doesn't give the same name as the debug info. We
16119 could fix this by only using the demangled name to get the
16120 prefix (but see comment in read_structure_type). */
16122 struct partial_die_info *real_pdi;
16123 struct partial_die_info *child_pdi;
16125 /* If this DIE (this DIE's specification, if any) has a parent, then
16126 we should not do this. We'll prepend the parent's fully qualified
16127 name when we create the partial symbol. */
16129 real_pdi = struct_pdi;
16130 while (real_pdi->has_specification)
16131 real_pdi = find_partial_die (real_pdi->spec_offset,
16132 real_pdi->spec_is_dwz, cu);
16134 if (real_pdi->die_parent != NULL)
16137 for (child_pdi = struct_pdi->die_child;
16139 child_pdi = child_pdi->die_sibling)
16141 if (child_pdi->tag == DW_TAG_subprogram
16142 && child_pdi->linkage_name != NULL)
16144 char *actual_class_name
16145 = language_class_name_from_physname (cu->language_defn,
16146 child_pdi->linkage_name);
16147 if (actual_class_name != NULL)
16151 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16153 strlen (actual_class_name)));
16154 xfree (actual_class_name);
16161 /* Adjust PART_DIE before generating a symbol for it. This function
16162 may set the is_external flag or change the DIE's name. */
16165 fixup_partial_die (struct partial_die_info *part_die,
16166 struct dwarf2_cu *cu)
16168 /* Once we've fixed up a die, there's no point in doing so again.
16169 This also avoids a memory leak if we were to call
16170 guess_partial_die_structure_name multiple times. */
16171 if (part_die->fixup_called)
16174 /* If we found a reference attribute and the DIE has no name, try
16175 to find a name in the referred to DIE. */
16177 if (part_die->name == NULL && part_die->has_specification)
16179 struct partial_die_info *spec_die;
16181 spec_die = find_partial_die (part_die->spec_offset,
16182 part_die->spec_is_dwz, cu);
16184 fixup_partial_die (spec_die, cu);
16186 if (spec_die->name)
16188 part_die->name = spec_die->name;
16190 /* Copy DW_AT_external attribute if it is set. */
16191 if (spec_die->is_external)
16192 part_die->is_external = spec_die->is_external;
16196 /* Set default names for some unnamed DIEs. */
16198 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
16199 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
16201 /* If there is no parent die to provide a namespace, and there are
16202 children, see if we can determine the namespace from their linkage
16204 if (cu->language == language_cplus
16205 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
16206 && part_die->die_parent == NULL
16207 && part_die->has_children
16208 && (part_die->tag == DW_TAG_class_type
16209 || part_die->tag == DW_TAG_structure_type
16210 || part_die->tag == DW_TAG_union_type))
16211 guess_partial_die_structure_name (part_die, cu);
16213 /* GCC might emit a nameless struct or union that has a linkage
16214 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
16215 if (part_die->name == NULL
16216 && (part_die->tag == DW_TAG_class_type
16217 || part_die->tag == DW_TAG_interface_type
16218 || part_die->tag == DW_TAG_structure_type
16219 || part_die->tag == DW_TAG_union_type)
16220 && part_die->linkage_name != NULL)
16224 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
16229 /* Strip any leading namespaces/classes, keep only the base name.
16230 DW_AT_name for named DIEs does not contain the prefixes. */
16231 base = strrchr (demangled, ':');
16232 if (base && base > demangled && base[-1] == ':')
16239 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16240 base, strlen (base)));
16245 part_die->fixup_called = 1;
16248 /* Read an attribute value described by an attribute form. */
16250 static const gdb_byte *
16251 read_attribute_value (const struct die_reader_specs *reader,
16252 struct attribute *attr, unsigned form,
16253 const gdb_byte *info_ptr)
16255 struct dwarf2_cu *cu = reader->cu;
16256 struct objfile *objfile = cu->objfile;
16257 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16258 bfd *abfd = reader->abfd;
16259 struct comp_unit_head *cu_header = &cu->header;
16260 unsigned int bytes_read;
16261 struct dwarf_block *blk;
16263 attr->form = (enum dwarf_form) form;
16266 case DW_FORM_ref_addr:
16267 if (cu->header.version == 2)
16268 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16270 DW_UNSND (attr) = read_offset (abfd, info_ptr,
16271 &cu->header, &bytes_read);
16272 info_ptr += bytes_read;
16274 case DW_FORM_GNU_ref_alt:
16275 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16276 info_ptr += bytes_read;
16279 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16280 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
16281 info_ptr += bytes_read;
16283 case DW_FORM_block2:
16284 blk = dwarf_alloc_block (cu);
16285 blk->size = read_2_bytes (abfd, info_ptr);
16287 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16288 info_ptr += blk->size;
16289 DW_BLOCK (attr) = blk;
16291 case DW_FORM_block4:
16292 blk = dwarf_alloc_block (cu);
16293 blk->size = read_4_bytes (abfd, info_ptr);
16295 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16296 info_ptr += blk->size;
16297 DW_BLOCK (attr) = blk;
16299 case DW_FORM_data2:
16300 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
16303 case DW_FORM_data4:
16304 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
16307 case DW_FORM_data8:
16308 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
16311 case DW_FORM_sec_offset:
16312 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16313 info_ptr += bytes_read;
16315 case DW_FORM_string:
16316 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
16317 DW_STRING_IS_CANONICAL (attr) = 0;
16318 info_ptr += bytes_read;
16321 if (!cu->per_cu->is_dwz)
16323 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
16325 DW_STRING_IS_CANONICAL (attr) = 0;
16326 info_ptr += bytes_read;
16330 case DW_FORM_GNU_strp_alt:
16332 struct dwz_file *dwz = dwarf2_get_dwz_file ();
16333 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
16336 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
16337 DW_STRING_IS_CANONICAL (attr) = 0;
16338 info_ptr += bytes_read;
16341 case DW_FORM_exprloc:
16342 case DW_FORM_block:
16343 blk = dwarf_alloc_block (cu);
16344 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16345 info_ptr += bytes_read;
16346 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16347 info_ptr += blk->size;
16348 DW_BLOCK (attr) = blk;
16350 case DW_FORM_block1:
16351 blk = dwarf_alloc_block (cu);
16352 blk->size = read_1_byte (abfd, info_ptr);
16354 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16355 info_ptr += blk->size;
16356 DW_BLOCK (attr) = blk;
16358 case DW_FORM_data1:
16359 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16363 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16366 case DW_FORM_flag_present:
16367 DW_UNSND (attr) = 1;
16369 case DW_FORM_sdata:
16370 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
16371 info_ptr += bytes_read;
16373 case DW_FORM_udata:
16374 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16375 info_ptr += bytes_read;
16378 DW_UNSND (attr) = (cu->header.offset.sect_off
16379 + read_1_byte (abfd, info_ptr));
16383 DW_UNSND (attr) = (cu->header.offset.sect_off
16384 + read_2_bytes (abfd, info_ptr));
16388 DW_UNSND (attr) = (cu->header.offset.sect_off
16389 + read_4_bytes (abfd, info_ptr));
16393 DW_UNSND (attr) = (cu->header.offset.sect_off
16394 + read_8_bytes (abfd, info_ptr));
16397 case DW_FORM_ref_sig8:
16398 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
16401 case DW_FORM_ref_udata:
16402 DW_UNSND (attr) = (cu->header.offset.sect_off
16403 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
16404 info_ptr += bytes_read;
16406 case DW_FORM_indirect:
16407 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16408 info_ptr += bytes_read;
16409 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
16411 case DW_FORM_GNU_addr_index:
16412 if (reader->dwo_file == NULL)
16414 /* For now flag a hard error.
16415 Later we can turn this into a complaint. */
16416 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16417 dwarf_form_name (form),
16418 bfd_get_filename (abfd));
16420 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
16421 info_ptr += bytes_read;
16423 case DW_FORM_GNU_str_index:
16424 if (reader->dwo_file == NULL)
16426 /* For now flag a hard error.
16427 Later we can turn this into a complaint if warranted. */
16428 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16429 dwarf_form_name (form),
16430 bfd_get_filename (abfd));
16433 ULONGEST str_index =
16434 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16436 DW_STRING (attr) = read_str_index (reader, str_index);
16437 DW_STRING_IS_CANONICAL (attr) = 0;
16438 info_ptr += bytes_read;
16442 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
16443 dwarf_form_name (form),
16444 bfd_get_filename (abfd));
16448 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
16449 attr->form = DW_FORM_GNU_ref_alt;
16451 /* We have seen instances where the compiler tried to emit a byte
16452 size attribute of -1 which ended up being encoded as an unsigned
16453 0xffffffff. Although 0xffffffff is technically a valid size value,
16454 an object of this size seems pretty unlikely so we can relatively
16455 safely treat these cases as if the size attribute was invalid and
16456 treat them as zero by default. */
16457 if (attr->name == DW_AT_byte_size
16458 && form == DW_FORM_data4
16459 && DW_UNSND (attr) >= 0xffffffff)
16462 (&symfile_complaints,
16463 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
16464 hex_string (DW_UNSND (attr)));
16465 DW_UNSND (attr) = 0;
16471 /* Read an attribute described by an abbreviated attribute. */
16473 static const gdb_byte *
16474 read_attribute (const struct die_reader_specs *reader,
16475 struct attribute *attr, struct attr_abbrev *abbrev,
16476 const gdb_byte *info_ptr)
16478 attr->name = abbrev->name;
16479 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
16482 /* Read dwarf information from a buffer. */
16484 static unsigned int
16485 read_1_byte (bfd *abfd, const gdb_byte *buf)
16487 return bfd_get_8 (abfd, buf);
16491 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
16493 return bfd_get_signed_8 (abfd, buf);
16496 static unsigned int
16497 read_2_bytes (bfd *abfd, const gdb_byte *buf)
16499 return bfd_get_16 (abfd, buf);
16503 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
16505 return bfd_get_signed_16 (abfd, buf);
16508 static unsigned int
16509 read_4_bytes (bfd *abfd, const gdb_byte *buf)
16511 return bfd_get_32 (abfd, buf);
16515 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
16517 return bfd_get_signed_32 (abfd, buf);
16521 read_8_bytes (bfd *abfd, const gdb_byte *buf)
16523 return bfd_get_64 (abfd, buf);
16527 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
16528 unsigned int *bytes_read)
16530 struct comp_unit_head *cu_header = &cu->header;
16531 CORE_ADDR retval = 0;
16533 if (cu_header->signed_addr_p)
16535 switch (cu_header->addr_size)
16538 retval = bfd_get_signed_16 (abfd, buf);
16541 retval = bfd_get_signed_32 (abfd, buf);
16544 retval = bfd_get_signed_64 (abfd, buf);
16547 internal_error (__FILE__, __LINE__,
16548 _("read_address: bad switch, signed [in module %s]"),
16549 bfd_get_filename (abfd));
16554 switch (cu_header->addr_size)
16557 retval = bfd_get_16 (abfd, buf);
16560 retval = bfd_get_32 (abfd, buf);
16563 retval = bfd_get_64 (abfd, buf);
16566 internal_error (__FILE__, __LINE__,
16567 _("read_address: bad switch, "
16568 "unsigned [in module %s]"),
16569 bfd_get_filename (abfd));
16573 *bytes_read = cu_header->addr_size;
16577 /* Read the initial length from a section. The (draft) DWARF 3
16578 specification allows the initial length to take up either 4 bytes
16579 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
16580 bytes describe the length and all offsets will be 8 bytes in length
16583 An older, non-standard 64-bit format is also handled by this
16584 function. The older format in question stores the initial length
16585 as an 8-byte quantity without an escape value. Lengths greater
16586 than 2^32 aren't very common which means that the initial 4 bytes
16587 is almost always zero. Since a length value of zero doesn't make
16588 sense for the 32-bit format, this initial zero can be considered to
16589 be an escape value which indicates the presence of the older 64-bit
16590 format. As written, the code can't detect (old format) lengths
16591 greater than 4GB. If it becomes necessary to handle lengths
16592 somewhat larger than 4GB, we could allow other small values (such
16593 as the non-sensical values of 1, 2, and 3) to also be used as
16594 escape values indicating the presence of the old format.
16596 The value returned via bytes_read should be used to increment the
16597 relevant pointer after calling read_initial_length().
16599 [ Note: read_initial_length() and read_offset() are based on the
16600 document entitled "DWARF Debugging Information Format", revision
16601 3, draft 8, dated November 19, 2001. This document was obtained
16604 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
16606 This document is only a draft and is subject to change. (So beware.)
16608 Details regarding the older, non-standard 64-bit format were
16609 determined empirically by examining 64-bit ELF files produced by
16610 the SGI toolchain on an IRIX 6.5 machine.
16612 - Kevin, July 16, 2002
16616 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
16618 LONGEST length = bfd_get_32 (abfd, buf);
16620 if (length == 0xffffffff)
16622 length = bfd_get_64 (abfd, buf + 4);
16625 else if (length == 0)
16627 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
16628 length = bfd_get_64 (abfd, buf);
16639 /* Cover function for read_initial_length.
16640 Returns the length of the object at BUF, and stores the size of the
16641 initial length in *BYTES_READ and stores the size that offsets will be in
16643 If the initial length size is not equivalent to that specified in
16644 CU_HEADER then issue a complaint.
16645 This is useful when reading non-comp-unit headers. */
16648 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
16649 const struct comp_unit_head *cu_header,
16650 unsigned int *bytes_read,
16651 unsigned int *offset_size)
16653 LONGEST length = read_initial_length (abfd, buf, bytes_read);
16655 gdb_assert (cu_header->initial_length_size == 4
16656 || cu_header->initial_length_size == 8
16657 || cu_header->initial_length_size == 12);
16659 if (cu_header->initial_length_size != *bytes_read)
16660 complaint (&symfile_complaints,
16661 _("intermixed 32-bit and 64-bit DWARF sections"));
16663 *offset_size = (*bytes_read == 4) ? 4 : 8;
16667 /* Read an offset from the data stream. The size of the offset is
16668 given by cu_header->offset_size. */
16671 read_offset (bfd *abfd, const gdb_byte *buf,
16672 const struct comp_unit_head *cu_header,
16673 unsigned int *bytes_read)
16675 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
16677 *bytes_read = cu_header->offset_size;
16681 /* Read an offset from the data stream. */
16684 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
16686 LONGEST retval = 0;
16688 switch (offset_size)
16691 retval = bfd_get_32 (abfd, buf);
16694 retval = bfd_get_64 (abfd, buf);
16697 internal_error (__FILE__, __LINE__,
16698 _("read_offset_1: bad switch [in module %s]"),
16699 bfd_get_filename (abfd));
16705 static const gdb_byte *
16706 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
16708 /* If the size of a host char is 8 bits, we can return a pointer
16709 to the buffer, otherwise we have to copy the data to a buffer
16710 allocated on the temporary obstack. */
16711 gdb_assert (HOST_CHAR_BIT == 8);
16715 static const char *
16716 read_direct_string (bfd *abfd, const gdb_byte *buf,
16717 unsigned int *bytes_read_ptr)
16719 /* If the size of a host char is 8 bits, we can return a pointer
16720 to the string, otherwise we have to copy the string to a buffer
16721 allocated on the temporary obstack. */
16722 gdb_assert (HOST_CHAR_BIT == 8);
16725 *bytes_read_ptr = 1;
16728 *bytes_read_ptr = strlen ((const char *) buf) + 1;
16729 return (const char *) buf;
16732 static const char *
16733 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
16735 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
16736 if (dwarf2_per_objfile->str.buffer == NULL)
16737 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
16738 bfd_get_filename (abfd));
16739 if (str_offset >= dwarf2_per_objfile->str.size)
16740 error (_("DW_FORM_strp pointing outside of "
16741 ".debug_str section [in module %s]"),
16742 bfd_get_filename (abfd));
16743 gdb_assert (HOST_CHAR_BIT == 8);
16744 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
16746 return (const char *) (dwarf2_per_objfile->str.buffer + str_offset);
16749 /* Read a string at offset STR_OFFSET in the .debug_str section from
16750 the .dwz file DWZ. Throw an error if the offset is too large. If
16751 the string consists of a single NUL byte, return NULL; otherwise
16752 return a pointer to the string. */
16754 static const char *
16755 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
16757 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
16759 if (dwz->str.buffer == NULL)
16760 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
16761 "section [in module %s]"),
16762 bfd_get_filename (dwz->dwz_bfd));
16763 if (str_offset >= dwz->str.size)
16764 error (_("DW_FORM_GNU_strp_alt pointing outside of "
16765 ".debug_str section [in module %s]"),
16766 bfd_get_filename (dwz->dwz_bfd));
16767 gdb_assert (HOST_CHAR_BIT == 8);
16768 if (dwz->str.buffer[str_offset] == '\0')
16770 return (const char *) (dwz->str.buffer + str_offset);
16773 static const char *
16774 read_indirect_string (bfd *abfd, const gdb_byte *buf,
16775 const struct comp_unit_head *cu_header,
16776 unsigned int *bytes_read_ptr)
16778 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
16780 return read_indirect_string_at_offset (abfd, str_offset);
16784 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
16785 unsigned int *bytes_read_ptr)
16788 unsigned int num_read;
16790 unsigned char byte;
16797 byte = bfd_get_8 (abfd, buf);
16800 result |= ((ULONGEST) (byte & 127) << shift);
16801 if ((byte & 128) == 0)
16807 *bytes_read_ptr = num_read;
16812 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
16813 unsigned int *bytes_read_ptr)
16816 int shift, num_read;
16817 unsigned char byte;
16824 byte = bfd_get_8 (abfd, buf);
16827 result |= ((LONGEST) (byte & 127) << shift);
16829 if ((byte & 128) == 0)
16834 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
16835 result |= -(((LONGEST) 1) << shift);
16836 *bytes_read_ptr = num_read;
16840 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
16841 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
16842 ADDR_SIZE is the size of addresses from the CU header. */
16845 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
16847 struct objfile *objfile = dwarf2_per_objfile->objfile;
16848 bfd *abfd = objfile->obfd;
16849 const gdb_byte *info_ptr;
16851 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
16852 if (dwarf2_per_objfile->addr.buffer == NULL)
16853 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
16854 objfile_name (objfile));
16855 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
16856 error (_("DW_FORM_addr_index pointing outside of "
16857 ".debug_addr section [in module %s]"),
16858 objfile_name (objfile));
16859 info_ptr = (dwarf2_per_objfile->addr.buffer
16860 + addr_base + addr_index * addr_size);
16861 if (addr_size == 4)
16862 return bfd_get_32 (abfd, info_ptr);
16864 return bfd_get_64 (abfd, info_ptr);
16867 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
16870 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
16872 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
16875 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
16878 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
16879 unsigned int *bytes_read)
16881 bfd *abfd = cu->objfile->obfd;
16882 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
16884 return read_addr_index (cu, addr_index);
16887 /* Data structure to pass results from dwarf2_read_addr_index_reader
16888 back to dwarf2_read_addr_index. */
16890 struct dwarf2_read_addr_index_data
16892 ULONGEST addr_base;
16896 /* die_reader_func for dwarf2_read_addr_index. */
16899 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
16900 const gdb_byte *info_ptr,
16901 struct die_info *comp_unit_die,
16905 struct dwarf2_cu *cu = reader->cu;
16906 struct dwarf2_read_addr_index_data *aidata =
16907 (struct dwarf2_read_addr_index_data *) data;
16909 aidata->addr_base = cu->addr_base;
16910 aidata->addr_size = cu->header.addr_size;
16913 /* Given an index in .debug_addr, fetch the value.
16914 NOTE: This can be called during dwarf expression evaluation,
16915 long after the debug information has been read, and thus per_cu->cu
16916 may no longer exist. */
16919 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
16920 unsigned int addr_index)
16922 struct objfile *objfile = per_cu->objfile;
16923 struct dwarf2_cu *cu = per_cu->cu;
16924 ULONGEST addr_base;
16927 /* This is intended to be called from outside this file. */
16928 dw2_setup (objfile);
16930 /* We need addr_base and addr_size.
16931 If we don't have PER_CU->cu, we have to get it.
16932 Nasty, but the alternative is storing the needed info in PER_CU,
16933 which at this point doesn't seem justified: it's not clear how frequently
16934 it would get used and it would increase the size of every PER_CU.
16935 Entry points like dwarf2_per_cu_addr_size do a similar thing
16936 so we're not in uncharted territory here.
16937 Alas we need to be a bit more complicated as addr_base is contained
16940 We don't need to read the entire CU(/TU).
16941 We just need the header and top level die.
16943 IWBN to use the aging mechanism to let us lazily later discard the CU.
16944 For now we skip this optimization. */
16948 addr_base = cu->addr_base;
16949 addr_size = cu->header.addr_size;
16953 struct dwarf2_read_addr_index_data aidata;
16955 /* Note: We can't use init_cutu_and_read_dies_simple here,
16956 we need addr_base. */
16957 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
16958 dwarf2_read_addr_index_reader, &aidata);
16959 addr_base = aidata.addr_base;
16960 addr_size = aidata.addr_size;
16963 return read_addr_index_1 (addr_index, addr_base, addr_size);
16966 /* Given a DW_FORM_GNU_str_index, fetch the string.
16967 This is only used by the Fission support. */
16969 static const char *
16970 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
16972 struct objfile *objfile = dwarf2_per_objfile->objfile;
16973 const char *objf_name = objfile_name (objfile);
16974 bfd *abfd = objfile->obfd;
16975 struct dwarf2_cu *cu = reader->cu;
16976 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
16977 struct dwarf2_section_info *str_offsets_section =
16978 &reader->dwo_file->sections.str_offsets;
16979 const gdb_byte *info_ptr;
16980 ULONGEST str_offset;
16981 static const char form_name[] = "DW_FORM_GNU_str_index";
16983 dwarf2_read_section (objfile, str_section);
16984 dwarf2_read_section (objfile, str_offsets_section);
16985 if (str_section->buffer == NULL)
16986 error (_("%s used without .debug_str.dwo section"
16987 " in CU at offset 0x%lx [in module %s]"),
16988 form_name, (long) cu->header.offset.sect_off, objf_name);
16989 if (str_offsets_section->buffer == NULL)
16990 error (_("%s used without .debug_str_offsets.dwo section"
16991 " in CU at offset 0x%lx [in module %s]"),
16992 form_name, (long) cu->header.offset.sect_off, objf_name);
16993 if (str_index * cu->header.offset_size >= str_offsets_section->size)
16994 error (_("%s pointing outside of .debug_str_offsets.dwo"
16995 " section in CU at offset 0x%lx [in module %s]"),
16996 form_name, (long) cu->header.offset.sect_off, objf_name);
16997 info_ptr = (str_offsets_section->buffer
16998 + str_index * cu->header.offset_size);
16999 if (cu->header.offset_size == 4)
17000 str_offset = bfd_get_32 (abfd, info_ptr);
17002 str_offset = bfd_get_64 (abfd, info_ptr);
17003 if (str_offset >= str_section->size)
17004 error (_("Offset from %s pointing outside of"
17005 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
17006 form_name, (long) cu->header.offset.sect_off, objf_name);
17007 return (const char *) (str_section->buffer + str_offset);
17010 /* Return the length of an LEB128 number in BUF. */
17013 leb128_size (const gdb_byte *buf)
17015 const gdb_byte *begin = buf;
17021 if ((byte & 128) == 0)
17022 return buf - begin;
17027 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
17036 cu->language = language_c;
17039 case DW_LANG_C_plus_plus:
17040 case DW_LANG_C_plus_plus_11:
17041 case DW_LANG_C_plus_plus_14:
17042 cu->language = language_cplus;
17045 cu->language = language_d;
17047 case DW_LANG_Fortran77:
17048 case DW_LANG_Fortran90:
17049 case DW_LANG_Fortran95:
17050 case DW_LANG_Fortran03:
17051 case DW_LANG_Fortran08:
17052 cu->language = language_fortran;
17055 cu->language = language_go;
17057 case DW_LANG_Mips_Assembler:
17058 cu->language = language_asm;
17060 case DW_LANG_Ada83:
17061 case DW_LANG_Ada95:
17062 cu->language = language_ada;
17064 case DW_LANG_Modula2:
17065 cu->language = language_m2;
17067 case DW_LANG_Pascal83:
17068 cu->language = language_pascal;
17071 cu->language = language_objc;
17074 case DW_LANG_Rust_old:
17075 cu->language = language_rust;
17077 case DW_LANG_Cobol74:
17078 case DW_LANG_Cobol85:
17080 cu->language = language_minimal;
17083 cu->language_defn = language_def (cu->language);
17086 /* Return the named attribute or NULL if not there. */
17088 static struct attribute *
17089 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17094 struct attribute *spec = NULL;
17096 for (i = 0; i < die->num_attrs; ++i)
17098 if (die->attrs[i].name == name)
17099 return &die->attrs[i];
17100 if (die->attrs[i].name == DW_AT_specification
17101 || die->attrs[i].name == DW_AT_abstract_origin)
17102 spec = &die->attrs[i];
17108 die = follow_die_ref (die, spec, &cu);
17114 /* Return the named attribute or NULL if not there,
17115 but do not follow DW_AT_specification, etc.
17116 This is for use in contexts where we're reading .debug_types dies.
17117 Following DW_AT_specification, DW_AT_abstract_origin will take us
17118 back up the chain, and we want to go down. */
17120 static struct attribute *
17121 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
17125 for (i = 0; i < die->num_attrs; ++i)
17126 if (die->attrs[i].name == name)
17127 return &die->attrs[i];
17132 /* Return the string associated with a string-typed attribute, or NULL if it
17133 is either not found or is of an incorrect type. */
17135 static const char *
17136 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17138 struct attribute *attr;
17139 const char *str = NULL;
17141 attr = dwarf2_attr (die, name, cu);
17145 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_string
17146 || attr->form == DW_FORM_GNU_strp_alt)
17147 str = DW_STRING (attr);
17149 complaint (&symfile_complaints,
17150 _("string type expected for attribute %s for "
17151 "DIE at 0x%x in module %s"),
17152 dwarf_attr_name (name), die->offset.sect_off,
17153 objfile_name (cu->objfile));
17159 /* Return non-zero iff the attribute NAME is defined for the given DIE,
17160 and holds a non-zero value. This function should only be used for
17161 DW_FORM_flag or DW_FORM_flag_present attributes. */
17164 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
17166 struct attribute *attr = dwarf2_attr (die, name, cu);
17168 return (attr && DW_UNSND (attr));
17172 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
17174 /* A DIE is a declaration if it has a DW_AT_declaration attribute
17175 which value is non-zero. However, we have to be careful with
17176 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
17177 (via dwarf2_flag_true_p) follows this attribute. So we may
17178 end up accidently finding a declaration attribute that belongs
17179 to a different DIE referenced by the specification attribute,
17180 even though the given DIE does not have a declaration attribute. */
17181 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
17182 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
17185 /* Return the die giving the specification for DIE, if there is
17186 one. *SPEC_CU is the CU containing DIE on input, and the CU
17187 containing the return value on output. If there is no
17188 specification, but there is an abstract origin, that is
17191 static struct die_info *
17192 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
17194 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
17197 if (spec_attr == NULL)
17198 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
17200 if (spec_attr == NULL)
17203 return follow_die_ref (die, spec_attr, spec_cu);
17206 /* Free the line_header structure *LH, and any arrays and strings it
17208 NOTE: This is also used as a "cleanup" function. */
17211 free_line_header (struct line_header *lh)
17213 if (lh->standard_opcode_lengths)
17214 xfree (lh->standard_opcode_lengths);
17216 /* Remember that all the lh->file_names[i].name pointers are
17217 pointers into debug_line_buffer, and don't need to be freed. */
17218 if (lh->file_names)
17219 xfree (lh->file_names);
17221 /* Similarly for the include directory names. */
17222 if (lh->include_dirs)
17223 xfree (lh->include_dirs);
17228 /* Stub for free_line_header to match void * callback types. */
17231 free_line_header_voidp (void *arg)
17233 struct line_header *lh = (struct line_header *) arg;
17235 free_line_header (lh);
17238 /* Add an entry to LH's include directory table. */
17241 add_include_dir (struct line_header *lh, const char *include_dir)
17243 if (dwarf_line_debug >= 2)
17244 fprintf_unfiltered (gdb_stdlog, "Adding dir %u: %s\n",
17245 lh->num_include_dirs + 1, include_dir);
17247 /* Grow the array if necessary. */
17248 if (lh->include_dirs_size == 0)
17250 lh->include_dirs_size = 1; /* for testing */
17251 lh->include_dirs = XNEWVEC (const char *, lh->include_dirs_size);
17253 else if (lh->num_include_dirs >= lh->include_dirs_size)
17255 lh->include_dirs_size *= 2;
17256 lh->include_dirs = XRESIZEVEC (const char *, lh->include_dirs,
17257 lh->include_dirs_size);
17260 lh->include_dirs[lh->num_include_dirs++] = include_dir;
17263 /* Add an entry to LH's file name table. */
17266 add_file_name (struct line_header *lh,
17268 unsigned int dir_index,
17269 unsigned int mod_time,
17270 unsigned int length)
17272 struct file_entry *fe;
17274 if (dwarf_line_debug >= 2)
17275 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
17276 lh->num_file_names + 1, name);
17278 /* Grow the array if necessary. */
17279 if (lh->file_names_size == 0)
17281 lh->file_names_size = 1; /* for testing */
17282 lh->file_names = XNEWVEC (struct file_entry, lh->file_names_size);
17284 else if (lh->num_file_names >= lh->file_names_size)
17286 lh->file_names_size *= 2;
17288 = XRESIZEVEC (struct file_entry, lh->file_names, lh->file_names_size);
17291 fe = &lh->file_names[lh->num_file_names++];
17293 fe->dir_index = dir_index;
17294 fe->mod_time = mod_time;
17295 fe->length = length;
17296 fe->included_p = 0;
17300 /* A convenience function to find the proper .debug_line section for a CU. */
17302 static struct dwarf2_section_info *
17303 get_debug_line_section (struct dwarf2_cu *cu)
17305 struct dwarf2_section_info *section;
17307 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
17309 if (cu->dwo_unit && cu->per_cu->is_debug_types)
17310 section = &cu->dwo_unit->dwo_file->sections.line;
17311 else if (cu->per_cu->is_dwz)
17313 struct dwz_file *dwz = dwarf2_get_dwz_file ();
17315 section = &dwz->line;
17318 section = &dwarf2_per_objfile->line;
17323 /* Read the statement program header starting at OFFSET in
17324 .debug_line, or .debug_line.dwo. Return a pointer
17325 to a struct line_header, allocated using xmalloc.
17326 Returns NULL if there is a problem reading the header, e.g., if it
17327 has a version we don't understand.
17329 NOTE: the strings in the include directory and file name tables of
17330 the returned object point into the dwarf line section buffer,
17331 and must not be freed. */
17333 static struct line_header *
17334 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
17336 struct cleanup *back_to;
17337 struct line_header *lh;
17338 const gdb_byte *line_ptr;
17339 unsigned int bytes_read, offset_size;
17341 const char *cur_dir, *cur_file;
17342 struct dwarf2_section_info *section;
17345 section = get_debug_line_section (cu);
17346 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
17347 if (section->buffer == NULL)
17349 if (cu->dwo_unit && cu->per_cu->is_debug_types)
17350 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
17352 complaint (&symfile_complaints, _("missing .debug_line section"));
17356 /* We can't do this until we know the section is non-empty.
17357 Only then do we know we have such a section. */
17358 abfd = get_section_bfd_owner (section);
17360 /* Make sure that at least there's room for the total_length field.
17361 That could be 12 bytes long, but we're just going to fudge that. */
17362 if (offset + 4 >= section->size)
17364 dwarf2_statement_list_fits_in_line_number_section_complaint ();
17368 lh = XNEW (struct line_header);
17369 memset (lh, 0, sizeof (*lh));
17370 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
17373 lh->offset.sect_off = offset;
17374 lh->offset_in_dwz = cu->per_cu->is_dwz;
17376 line_ptr = section->buffer + offset;
17378 /* Read in the header. */
17380 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
17381 &bytes_read, &offset_size);
17382 line_ptr += bytes_read;
17383 if (line_ptr + lh->total_length > (section->buffer + section->size))
17385 dwarf2_statement_list_fits_in_line_number_section_complaint ();
17386 do_cleanups (back_to);
17389 lh->statement_program_end = line_ptr + lh->total_length;
17390 lh->version = read_2_bytes (abfd, line_ptr);
17392 if (lh->version > 4)
17394 /* This is a version we don't understand. The format could have
17395 changed in ways we don't handle properly so just punt. */
17396 complaint (&symfile_complaints,
17397 _("unsupported version in .debug_line section"));
17400 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
17401 line_ptr += offset_size;
17402 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
17404 if (lh->version >= 4)
17406 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
17410 lh->maximum_ops_per_instruction = 1;
17412 if (lh->maximum_ops_per_instruction == 0)
17414 lh->maximum_ops_per_instruction = 1;
17415 complaint (&symfile_complaints,
17416 _("invalid maximum_ops_per_instruction "
17417 "in `.debug_line' section"));
17420 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
17422 lh->line_base = read_1_signed_byte (abfd, line_ptr);
17424 lh->line_range = read_1_byte (abfd, line_ptr);
17426 lh->opcode_base = read_1_byte (abfd, line_ptr);
17428 lh->standard_opcode_lengths = XNEWVEC (unsigned char, lh->opcode_base);
17430 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
17431 for (i = 1; i < lh->opcode_base; ++i)
17433 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
17437 /* Read directory table. */
17438 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
17440 line_ptr += bytes_read;
17441 add_include_dir (lh, cur_dir);
17443 line_ptr += bytes_read;
17445 /* Read file name table. */
17446 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
17448 unsigned int dir_index, mod_time, length;
17450 line_ptr += bytes_read;
17451 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17452 line_ptr += bytes_read;
17453 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17454 line_ptr += bytes_read;
17455 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17456 line_ptr += bytes_read;
17458 add_file_name (lh, cur_file, dir_index, mod_time, length);
17460 line_ptr += bytes_read;
17461 lh->statement_program_start = line_ptr;
17463 if (line_ptr > (section->buffer + section->size))
17464 complaint (&symfile_complaints,
17465 _("line number info header doesn't "
17466 "fit in `.debug_line' section"));
17468 discard_cleanups (back_to);
17472 /* Subroutine of dwarf_decode_lines to simplify it.
17473 Return the file name of the psymtab for included file FILE_INDEX
17474 in line header LH of PST.
17475 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
17476 If space for the result is malloc'd, it will be freed by a cleanup.
17477 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
17479 The function creates dangling cleanup registration. */
17481 static const char *
17482 psymtab_include_file_name (const struct line_header *lh, int file_index,
17483 const struct partial_symtab *pst,
17484 const char *comp_dir)
17486 const struct file_entry fe = lh->file_names [file_index];
17487 const char *include_name = fe.name;
17488 const char *include_name_to_compare = include_name;
17489 const char *dir_name = NULL;
17490 const char *pst_filename;
17491 char *copied_name = NULL;
17494 if (fe.dir_index && lh->include_dirs != NULL)
17495 dir_name = lh->include_dirs[fe.dir_index - 1];
17497 if (!IS_ABSOLUTE_PATH (include_name)
17498 && (dir_name != NULL || comp_dir != NULL))
17500 /* Avoid creating a duplicate psymtab for PST.
17501 We do this by comparing INCLUDE_NAME and PST_FILENAME.
17502 Before we do the comparison, however, we need to account
17503 for DIR_NAME and COMP_DIR.
17504 First prepend dir_name (if non-NULL). If we still don't
17505 have an absolute path prepend comp_dir (if non-NULL).
17506 However, the directory we record in the include-file's
17507 psymtab does not contain COMP_DIR (to match the
17508 corresponding symtab(s)).
17513 bash$ gcc -g ./hello.c
17514 include_name = "hello.c"
17516 DW_AT_comp_dir = comp_dir = "/tmp"
17517 DW_AT_name = "./hello.c"
17521 if (dir_name != NULL)
17523 char *tem = concat (dir_name, SLASH_STRING,
17524 include_name, (char *)NULL);
17526 make_cleanup (xfree, tem);
17527 include_name = tem;
17528 include_name_to_compare = include_name;
17530 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
17532 char *tem = concat (comp_dir, SLASH_STRING,
17533 include_name, (char *)NULL);
17535 make_cleanup (xfree, tem);
17536 include_name_to_compare = tem;
17540 pst_filename = pst->filename;
17541 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
17543 copied_name = concat (pst->dirname, SLASH_STRING,
17544 pst_filename, (char *)NULL);
17545 pst_filename = copied_name;
17548 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
17550 if (copied_name != NULL)
17551 xfree (copied_name);
17555 return include_name;
17558 /* State machine to track the state of the line number program. */
17562 /* These are part of the standard DWARF line number state machine. */
17564 unsigned char op_index;
17569 unsigned int discriminator;
17571 /* Additional bits of state we need to track. */
17573 /* The last file that we called dwarf2_start_subfile for.
17574 This is only used for TLLs. */
17575 unsigned int last_file;
17576 /* The last file a line number was recorded for. */
17577 struct subfile *last_subfile;
17579 /* The function to call to record a line. */
17580 record_line_ftype *record_line;
17582 /* The last line number that was recorded, used to coalesce
17583 consecutive entries for the same line. This can happen, for
17584 example, when discriminators are present. PR 17276. */
17585 unsigned int last_line;
17586 int line_has_non_zero_discriminator;
17587 } lnp_state_machine;
17589 /* There's a lot of static state to pass to dwarf_record_line.
17590 This keeps it all together. */
17595 struct gdbarch *gdbarch;
17597 /* The line number header. */
17598 struct line_header *line_header;
17600 /* Non-zero if we're recording lines.
17601 Otherwise we're building partial symtabs and are just interested in
17602 finding include files mentioned by the line number program. */
17603 int record_lines_p;
17604 } lnp_reader_state;
17606 /* Ignore this record_line request. */
17609 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
17614 /* Return non-zero if we should add LINE to the line number table.
17615 LINE is the line to add, LAST_LINE is the last line that was added,
17616 LAST_SUBFILE is the subfile for LAST_LINE.
17617 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
17618 had a non-zero discriminator.
17620 We have to be careful in the presence of discriminators.
17621 E.g., for this line:
17623 for (i = 0; i < 100000; i++);
17625 clang can emit four line number entries for that one line,
17626 each with a different discriminator.
17627 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
17629 However, we want gdb to coalesce all four entries into one.
17630 Otherwise the user could stepi into the middle of the line and
17631 gdb would get confused about whether the pc really was in the
17632 middle of the line.
17634 Things are further complicated by the fact that two consecutive
17635 line number entries for the same line is a heuristic used by gcc
17636 to denote the end of the prologue. So we can't just discard duplicate
17637 entries, we have to be selective about it. The heuristic we use is
17638 that we only collapse consecutive entries for the same line if at least
17639 one of those entries has a non-zero discriminator. PR 17276.
17641 Note: Addresses in the line number state machine can never go backwards
17642 within one sequence, thus this coalescing is ok. */
17645 dwarf_record_line_p (unsigned int line, unsigned int last_line,
17646 int line_has_non_zero_discriminator,
17647 struct subfile *last_subfile)
17649 if (current_subfile != last_subfile)
17651 if (line != last_line)
17653 /* Same line for the same file that we've seen already.
17654 As a last check, for pr 17276, only record the line if the line
17655 has never had a non-zero discriminator. */
17656 if (!line_has_non_zero_discriminator)
17661 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
17662 in the line table of subfile SUBFILE. */
17665 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
17666 unsigned int line, CORE_ADDR address,
17667 record_line_ftype p_record_line)
17669 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
17671 if (dwarf_line_debug)
17673 fprintf_unfiltered (gdb_stdlog,
17674 "Recording line %u, file %s, address %s\n",
17675 line, lbasename (subfile->name),
17676 paddress (gdbarch, address));
17679 (*p_record_line) (subfile, line, addr);
17682 /* Subroutine of dwarf_decode_lines_1 to simplify it.
17683 Mark the end of a set of line number records.
17684 The arguments are the same as for dwarf_record_line_1.
17685 If SUBFILE is NULL the request is ignored. */
17688 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
17689 CORE_ADDR address, record_line_ftype p_record_line)
17691 if (subfile == NULL)
17694 if (dwarf_line_debug)
17696 fprintf_unfiltered (gdb_stdlog,
17697 "Finishing current line, file %s, address %s\n",
17698 lbasename (subfile->name),
17699 paddress (gdbarch, address));
17702 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
17705 /* Record the line in STATE.
17706 END_SEQUENCE is non-zero if we're processing the end of a sequence. */
17709 dwarf_record_line (lnp_reader_state *reader, lnp_state_machine *state,
17712 const struct line_header *lh = reader->line_header;
17713 unsigned int file, line, discriminator;
17716 file = state->file;
17717 line = state->line;
17718 is_stmt = state->is_stmt;
17719 discriminator = state->discriminator;
17721 if (dwarf_line_debug)
17723 fprintf_unfiltered (gdb_stdlog,
17724 "Processing actual line %u: file %u,"
17725 " address %s, is_stmt %u, discrim %u\n",
17727 paddress (reader->gdbarch, state->address),
17728 is_stmt, discriminator);
17731 if (file == 0 || file - 1 >= lh->num_file_names)
17732 dwarf2_debug_line_missing_file_complaint ();
17733 /* For now we ignore lines not starting on an instruction boundary.
17734 But not when processing end_sequence for compatibility with the
17735 previous version of the code. */
17736 else if (state->op_index == 0 || end_sequence)
17738 lh->file_names[file - 1].included_p = 1;
17739 if (reader->record_lines_p && is_stmt)
17741 if (state->last_subfile != current_subfile || end_sequence)
17743 dwarf_finish_line (reader->gdbarch, state->last_subfile,
17744 state->address, state->record_line);
17749 if (dwarf_record_line_p (line, state->last_line,
17750 state->line_has_non_zero_discriminator,
17751 state->last_subfile))
17753 dwarf_record_line_1 (reader->gdbarch, current_subfile,
17754 line, state->address,
17755 state->record_line);
17757 state->last_subfile = current_subfile;
17758 state->last_line = line;
17764 /* Initialize STATE for the start of a line number program. */
17767 init_lnp_state_machine (lnp_state_machine *state,
17768 const lnp_reader_state *reader)
17770 memset (state, 0, sizeof (*state));
17772 /* Just starting, there is no "last file". */
17773 state->last_file = 0;
17774 state->last_subfile = NULL;
17776 state->record_line = record_line;
17778 state->last_line = 0;
17779 state->line_has_non_zero_discriminator = 0;
17781 /* Initialize these according to the DWARF spec. */
17782 state->op_index = 0;
17785 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
17786 was a line entry for it so that the backend has a chance to adjust it
17787 and also record it in case it needs it. This is currently used by MIPS
17788 code, cf. `mips_adjust_dwarf2_line'. */
17789 state->address = gdbarch_adjust_dwarf2_line (reader->gdbarch, 0, 0);
17790 state->is_stmt = reader->line_header->default_is_stmt;
17791 state->discriminator = 0;
17794 /* Check address and if invalid nop-out the rest of the lines in this
17798 check_line_address (struct dwarf2_cu *cu, lnp_state_machine *state,
17799 const gdb_byte *line_ptr,
17800 CORE_ADDR lowpc, CORE_ADDR address)
17802 /* If address < lowpc then it's not a usable value, it's outside the
17803 pc range of the CU. However, we restrict the test to only address
17804 values of zero to preserve GDB's previous behaviour which is to
17805 handle the specific case of a function being GC'd by the linker. */
17807 if (address == 0 && address < lowpc)
17809 /* This line table is for a function which has been
17810 GCd by the linker. Ignore it. PR gdb/12528 */
17812 struct objfile *objfile = cu->objfile;
17813 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
17815 complaint (&symfile_complaints,
17816 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
17817 line_offset, objfile_name (objfile));
17818 state->record_line = noop_record_line;
17819 /* Note: sm.record_line is left as noop_record_line
17820 until we see DW_LNE_end_sequence. */
17824 /* Subroutine of dwarf_decode_lines to simplify it.
17825 Process the line number information in LH.
17826 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
17827 program in order to set included_p for every referenced header. */
17830 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
17831 const int decode_for_pst_p, CORE_ADDR lowpc)
17833 const gdb_byte *line_ptr, *extended_end;
17834 const gdb_byte *line_end;
17835 unsigned int bytes_read, extended_len;
17836 unsigned char op_code, extended_op;
17837 CORE_ADDR baseaddr;
17838 struct objfile *objfile = cu->objfile;
17839 bfd *abfd = objfile->obfd;
17840 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17841 /* Non-zero if we're recording line info (as opposed to building partial
17843 int record_lines_p = !decode_for_pst_p;
17844 /* A collection of things we need to pass to dwarf_record_line. */
17845 lnp_reader_state reader_state;
17847 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
17849 line_ptr = lh->statement_program_start;
17850 line_end = lh->statement_program_end;
17852 reader_state.gdbarch = gdbarch;
17853 reader_state.line_header = lh;
17854 reader_state.record_lines_p = record_lines_p;
17856 /* Read the statement sequences until there's nothing left. */
17857 while (line_ptr < line_end)
17859 /* The DWARF line number program state machine. */
17860 lnp_state_machine state_machine;
17861 int end_sequence = 0;
17863 /* Reset the state machine at the start of each sequence. */
17864 init_lnp_state_machine (&state_machine, &reader_state);
17866 if (record_lines_p && lh->num_file_names >= state_machine.file)
17868 /* Start a subfile for the current file of the state machine. */
17869 /* lh->include_dirs and lh->file_names are 0-based, but the
17870 directory and file name numbers in the statement program
17872 struct file_entry *fe = &lh->file_names[state_machine.file - 1];
17873 const char *dir = NULL;
17875 if (fe->dir_index && lh->include_dirs != NULL)
17876 dir = lh->include_dirs[fe->dir_index - 1];
17878 dwarf2_start_subfile (fe->name, dir);
17881 /* Decode the table. */
17882 while (line_ptr < line_end && !end_sequence)
17884 op_code = read_1_byte (abfd, line_ptr);
17887 if (op_code >= lh->opcode_base)
17889 /* Special opcode. */
17890 unsigned char adj_opcode;
17891 CORE_ADDR addr_adj;
17894 adj_opcode = op_code - lh->opcode_base;
17895 addr_adj = (((state_machine.op_index
17896 + (adj_opcode / lh->line_range))
17897 / lh->maximum_ops_per_instruction)
17898 * lh->minimum_instruction_length);
17899 state_machine.address
17900 += gdbarch_adjust_dwarf2_line (gdbarch, addr_adj, 1);
17901 state_machine.op_index = ((state_machine.op_index
17902 + (adj_opcode / lh->line_range))
17903 % lh->maximum_ops_per_instruction);
17904 line_delta = lh->line_base + (adj_opcode % lh->line_range);
17905 state_machine.line += line_delta;
17906 if (line_delta != 0)
17907 state_machine.line_has_non_zero_discriminator
17908 = state_machine.discriminator != 0;
17910 dwarf_record_line (&reader_state, &state_machine, 0);
17911 state_machine.discriminator = 0;
17913 else switch (op_code)
17915 case DW_LNS_extended_op:
17916 extended_len = read_unsigned_leb128 (abfd, line_ptr,
17918 line_ptr += bytes_read;
17919 extended_end = line_ptr + extended_len;
17920 extended_op = read_1_byte (abfd, line_ptr);
17922 switch (extended_op)
17924 case DW_LNE_end_sequence:
17925 state_machine.record_line = record_line;
17928 case DW_LNE_set_address:
17931 = read_address (abfd, line_ptr, cu, &bytes_read);
17933 line_ptr += bytes_read;
17934 check_line_address (cu, &state_machine, line_ptr,
17936 state_machine.op_index = 0;
17937 address += baseaddr;
17938 state_machine.address
17939 = gdbarch_adjust_dwarf2_line (gdbarch, address, 0);
17942 case DW_LNE_define_file:
17944 const char *cur_file;
17945 unsigned int dir_index, mod_time, length;
17947 cur_file = read_direct_string (abfd, line_ptr,
17949 line_ptr += bytes_read;
17951 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17952 line_ptr += bytes_read;
17954 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17955 line_ptr += bytes_read;
17957 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17958 line_ptr += bytes_read;
17959 add_file_name (lh, cur_file, dir_index, mod_time, length);
17962 case DW_LNE_set_discriminator:
17963 /* The discriminator is not interesting to the debugger;
17964 just ignore it. We still need to check its value though:
17965 if there are consecutive entries for the same
17966 (non-prologue) line we want to coalesce them.
17968 state_machine.discriminator
17969 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17970 state_machine.line_has_non_zero_discriminator
17971 |= state_machine.discriminator != 0;
17972 line_ptr += bytes_read;
17975 complaint (&symfile_complaints,
17976 _("mangled .debug_line section"));
17979 /* Make sure that we parsed the extended op correctly. If e.g.
17980 we expected a different address size than the producer used,
17981 we may have read the wrong number of bytes. */
17982 if (line_ptr != extended_end)
17984 complaint (&symfile_complaints,
17985 _("mangled .debug_line section"));
17990 dwarf_record_line (&reader_state, &state_machine, 0);
17991 state_machine.discriminator = 0;
17993 case DW_LNS_advance_pc:
17996 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
17997 CORE_ADDR addr_adj;
17999 addr_adj = (((state_machine.op_index + adjust)
18000 / lh->maximum_ops_per_instruction)
18001 * lh->minimum_instruction_length);
18002 state_machine.address
18003 += gdbarch_adjust_dwarf2_line (gdbarch, addr_adj, 1);
18004 state_machine.op_index = ((state_machine.op_index + adjust)
18005 % lh->maximum_ops_per_instruction);
18006 line_ptr += bytes_read;
18009 case DW_LNS_advance_line:
18012 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
18014 state_machine.line += line_delta;
18015 if (line_delta != 0)
18016 state_machine.line_has_non_zero_discriminator
18017 = state_machine.discriminator != 0;
18018 line_ptr += bytes_read;
18021 case DW_LNS_set_file:
18023 /* The arrays lh->include_dirs and lh->file_names are
18024 0-based, but the directory and file name numbers in
18025 the statement program are 1-based. */
18026 struct file_entry *fe;
18027 const char *dir = NULL;
18029 state_machine.file = read_unsigned_leb128 (abfd, line_ptr,
18031 line_ptr += bytes_read;
18032 if (state_machine.file == 0
18033 || state_machine.file - 1 >= lh->num_file_names)
18034 dwarf2_debug_line_missing_file_complaint ();
18037 fe = &lh->file_names[state_machine.file - 1];
18038 if (fe->dir_index && lh->include_dirs != NULL)
18039 dir = lh->include_dirs[fe->dir_index - 1];
18040 if (record_lines_p)
18042 state_machine.last_subfile = current_subfile;
18043 state_machine.line_has_non_zero_discriminator
18044 = state_machine.discriminator != 0;
18045 dwarf2_start_subfile (fe->name, dir);
18050 case DW_LNS_set_column:
18051 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18052 line_ptr += bytes_read;
18054 case DW_LNS_negate_stmt:
18055 state_machine.is_stmt = (!state_machine.is_stmt);
18057 case DW_LNS_set_basic_block:
18059 /* Add to the address register of the state machine the
18060 address increment value corresponding to special opcode
18061 255. I.e., this value is scaled by the minimum
18062 instruction length since special opcode 255 would have
18063 scaled the increment. */
18064 case DW_LNS_const_add_pc:
18066 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
18067 CORE_ADDR addr_adj;
18069 addr_adj = (((state_machine.op_index + adjust)
18070 / lh->maximum_ops_per_instruction)
18071 * lh->minimum_instruction_length);
18072 state_machine.address
18073 += gdbarch_adjust_dwarf2_line (gdbarch, addr_adj, 1);
18074 state_machine.op_index = ((state_machine.op_index + adjust)
18075 % lh->maximum_ops_per_instruction);
18078 case DW_LNS_fixed_advance_pc:
18080 CORE_ADDR addr_adj;
18082 addr_adj = read_2_bytes (abfd, line_ptr);
18083 state_machine.address
18084 += gdbarch_adjust_dwarf2_line (gdbarch, addr_adj, 1);
18085 state_machine.op_index = 0;
18091 /* Unknown standard opcode, ignore it. */
18094 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
18096 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18097 line_ptr += bytes_read;
18104 dwarf2_debug_line_missing_end_sequence_complaint ();
18106 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
18107 in which case we still finish recording the last line). */
18108 dwarf_record_line (&reader_state, &state_machine, 1);
18112 /* Decode the Line Number Program (LNP) for the given line_header
18113 structure and CU. The actual information extracted and the type
18114 of structures created from the LNP depends on the value of PST.
18116 1. If PST is NULL, then this procedure uses the data from the program
18117 to create all necessary symbol tables, and their linetables.
18119 2. If PST is not NULL, this procedure reads the program to determine
18120 the list of files included by the unit represented by PST, and
18121 builds all the associated partial symbol tables.
18123 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
18124 It is used for relative paths in the line table.
18125 NOTE: When processing partial symtabs (pst != NULL),
18126 comp_dir == pst->dirname.
18128 NOTE: It is important that psymtabs have the same file name (via strcmp)
18129 as the corresponding symtab. Since COMP_DIR is not used in the name of the
18130 symtab we don't use it in the name of the psymtabs we create.
18131 E.g. expand_line_sal requires this when finding psymtabs to expand.
18132 A good testcase for this is mb-inline.exp.
18134 LOWPC is the lowest address in CU (or 0 if not known).
18136 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
18137 for its PC<->lines mapping information. Otherwise only the filename
18138 table is read in. */
18141 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
18142 struct dwarf2_cu *cu, struct partial_symtab *pst,
18143 CORE_ADDR lowpc, int decode_mapping)
18145 struct objfile *objfile = cu->objfile;
18146 const int decode_for_pst_p = (pst != NULL);
18148 if (decode_mapping)
18149 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
18151 if (decode_for_pst_p)
18155 /* Now that we're done scanning the Line Header Program, we can
18156 create the psymtab of each included file. */
18157 for (file_index = 0; file_index < lh->num_file_names; file_index++)
18158 if (lh->file_names[file_index].included_p == 1)
18160 const char *include_name =
18161 psymtab_include_file_name (lh, file_index, pst, comp_dir);
18162 if (include_name != NULL)
18163 dwarf2_create_include_psymtab (include_name, pst, objfile);
18168 /* Make sure a symtab is created for every file, even files
18169 which contain only variables (i.e. no code with associated
18171 struct compunit_symtab *cust = buildsym_compunit_symtab ();
18174 for (i = 0; i < lh->num_file_names; i++)
18176 const char *dir = NULL;
18177 struct file_entry *fe;
18179 fe = &lh->file_names[i];
18180 if (fe->dir_index && lh->include_dirs != NULL)
18181 dir = lh->include_dirs[fe->dir_index - 1];
18182 dwarf2_start_subfile (fe->name, dir);
18184 if (current_subfile->symtab == NULL)
18186 current_subfile->symtab
18187 = allocate_symtab (cust, current_subfile->name);
18189 fe->symtab = current_subfile->symtab;
18194 /* Start a subfile for DWARF. FILENAME is the name of the file and
18195 DIRNAME the name of the source directory which contains FILENAME
18196 or NULL if not known.
18197 This routine tries to keep line numbers from identical absolute and
18198 relative file names in a common subfile.
18200 Using the `list' example from the GDB testsuite, which resides in
18201 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
18202 of /srcdir/list0.c yields the following debugging information for list0.c:
18204 DW_AT_name: /srcdir/list0.c
18205 DW_AT_comp_dir: /compdir
18206 files.files[0].name: list0.h
18207 files.files[0].dir: /srcdir
18208 files.files[1].name: list0.c
18209 files.files[1].dir: /srcdir
18211 The line number information for list0.c has to end up in a single
18212 subfile, so that `break /srcdir/list0.c:1' works as expected.
18213 start_subfile will ensure that this happens provided that we pass the
18214 concatenation of files.files[1].dir and files.files[1].name as the
18218 dwarf2_start_subfile (const char *filename, const char *dirname)
18222 /* In order not to lose the line information directory,
18223 we concatenate it to the filename when it makes sense.
18224 Note that the Dwarf3 standard says (speaking of filenames in line
18225 information): ``The directory index is ignored for file names
18226 that represent full path names''. Thus ignoring dirname in the
18227 `else' branch below isn't an issue. */
18229 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
18231 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
18235 start_subfile (filename);
18241 /* Start a symtab for DWARF.
18242 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
18244 static struct compunit_symtab *
18245 dwarf2_start_symtab (struct dwarf2_cu *cu,
18246 const char *name, const char *comp_dir, CORE_ADDR low_pc)
18248 struct compunit_symtab *cust
18249 = start_symtab (cu->objfile, name, comp_dir, low_pc);
18251 record_debugformat ("DWARF 2");
18252 record_producer (cu->producer);
18254 /* We assume that we're processing GCC output. */
18255 processing_gcc_compilation = 2;
18257 cu->processing_has_namespace_info = 0;
18263 var_decode_location (struct attribute *attr, struct symbol *sym,
18264 struct dwarf2_cu *cu)
18266 struct objfile *objfile = cu->objfile;
18267 struct comp_unit_head *cu_header = &cu->header;
18269 /* NOTE drow/2003-01-30: There used to be a comment and some special
18270 code here to turn a symbol with DW_AT_external and a
18271 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
18272 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
18273 with some versions of binutils) where shared libraries could have
18274 relocations against symbols in their debug information - the
18275 minimal symbol would have the right address, but the debug info
18276 would not. It's no longer necessary, because we will explicitly
18277 apply relocations when we read in the debug information now. */
18279 /* A DW_AT_location attribute with no contents indicates that a
18280 variable has been optimized away. */
18281 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
18283 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
18287 /* Handle one degenerate form of location expression specially, to
18288 preserve GDB's previous behavior when section offsets are
18289 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
18290 then mark this symbol as LOC_STATIC. */
18292 if (attr_form_is_block (attr)
18293 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
18294 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
18295 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
18296 && (DW_BLOCK (attr)->size
18297 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
18299 unsigned int dummy;
18301 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
18302 SYMBOL_VALUE_ADDRESS (sym) =
18303 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
18305 SYMBOL_VALUE_ADDRESS (sym) =
18306 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
18307 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
18308 fixup_symbol_section (sym, objfile);
18309 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
18310 SYMBOL_SECTION (sym));
18314 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
18315 expression evaluator, and use LOC_COMPUTED only when necessary
18316 (i.e. when the value of a register or memory location is
18317 referenced, or a thread-local block, etc.). Then again, it might
18318 not be worthwhile. I'm assuming that it isn't unless performance
18319 or memory numbers show me otherwise. */
18321 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
18323 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
18324 cu->has_loclist = 1;
18327 /* Given a pointer to a DWARF information entry, figure out if we need
18328 to make a symbol table entry for it, and if so, create a new entry
18329 and return a pointer to it.
18330 If TYPE is NULL, determine symbol type from the die, otherwise
18331 used the passed type.
18332 If SPACE is not NULL, use it to hold the new symbol. If it is
18333 NULL, allocate a new symbol on the objfile's obstack. */
18335 static struct symbol *
18336 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
18337 struct symbol *space)
18339 struct objfile *objfile = cu->objfile;
18340 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18341 struct symbol *sym = NULL;
18343 struct attribute *attr = NULL;
18344 struct attribute *attr2 = NULL;
18345 CORE_ADDR baseaddr;
18346 struct pending **list_to_add = NULL;
18348 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
18350 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
18352 name = dwarf2_name (die, cu);
18355 const char *linkagename;
18356 int suppress_add = 0;
18361 sym = allocate_symbol (objfile);
18362 OBJSTAT (objfile, n_syms++);
18364 /* Cache this symbol's name and the name's demangled form (if any). */
18365 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
18366 linkagename = dwarf2_physname (name, die, cu);
18367 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
18369 /* Fortran does not have mangling standard and the mangling does differ
18370 between gfortran, iFort etc. */
18371 if (cu->language == language_fortran
18372 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
18373 symbol_set_demangled_name (&(sym->ginfo),
18374 dwarf2_full_name (name, die, cu),
18377 /* Default assumptions.
18378 Use the passed type or decode it from the die. */
18379 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
18380 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
18382 SYMBOL_TYPE (sym) = type;
18384 SYMBOL_TYPE (sym) = die_type (die, cu);
18385 attr = dwarf2_attr (die,
18386 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
18390 SYMBOL_LINE (sym) = DW_UNSND (attr);
18393 attr = dwarf2_attr (die,
18394 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
18398 int file_index = DW_UNSND (attr);
18400 if (cu->line_header == NULL
18401 || file_index > cu->line_header->num_file_names)
18402 complaint (&symfile_complaints,
18403 _("file index out of range"));
18404 else if (file_index > 0)
18406 struct file_entry *fe;
18408 fe = &cu->line_header->file_names[file_index - 1];
18409 symbol_set_symtab (sym, fe->symtab);
18416 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
18421 addr = attr_value_as_address (attr);
18422 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
18423 SYMBOL_VALUE_ADDRESS (sym) = addr;
18425 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
18426 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
18427 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
18428 add_symbol_to_list (sym, cu->list_in_scope);
18430 case DW_TAG_subprogram:
18431 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
18433 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
18434 attr2 = dwarf2_attr (die, DW_AT_external, cu);
18435 if ((attr2 && (DW_UNSND (attr2) != 0))
18436 || cu->language == language_ada)
18438 /* Subprograms marked external are stored as a global symbol.
18439 Ada subprograms, whether marked external or not, are always
18440 stored as a global symbol, because we want to be able to
18441 access them globally. For instance, we want to be able
18442 to break on a nested subprogram without having to
18443 specify the context. */
18444 list_to_add = &global_symbols;
18448 list_to_add = cu->list_in_scope;
18451 case DW_TAG_inlined_subroutine:
18452 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
18454 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
18455 SYMBOL_INLINED (sym) = 1;
18456 list_to_add = cu->list_in_scope;
18458 case DW_TAG_template_value_param:
18460 /* Fall through. */
18461 case DW_TAG_constant:
18462 case DW_TAG_variable:
18463 case DW_TAG_member:
18464 /* Compilation with minimal debug info may result in
18465 variables with missing type entries. Change the
18466 misleading `void' type to something sensible. */
18467 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
18469 = objfile_type (objfile)->nodebug_data_symbol;
18471 attr = dwarf2_attr (die, DW_AT_const_value, cu);
18472 /* In the case of DW_TAG_member, we should only be called for
18473 static const members. */
18474 if (die->tag == DW_TAG_member)
18476 /* dwarf2_add_field uses die_is_declaration,
18477 so we do the same. */
18478 gdb_assert (die_is_declaration (die, cu));
18483 dwarf2_const_value (attr, sym, cu);
18484 attr2 = dwarf2_attr (die, DW_AT_external, cu);
18487 if (attr2 && (DW_UNSND (attr2) != 0))
18488 list_to_add = &global_symbols;
18490 list_to_add = cu->list_in_scope;
18494 attr = dwarf2_attr (die, DW_AT_location, cu);
18497 var_decode_location (attr, sym, cu);
18498 attr2 = dwarf2_attr (die, DW_AT_external, cu);
18500 /* Fortran explicitly imports any global symbols to the local
18501 scope by DW_TAG_common_block. */
18502 if (cu->language == language_fortran && die->parent
18503 && die->parent->tag == DW_TAG_common_block)
18506 if (SYMBOL_CLASS (sym) == LOC_STATIC
18507 && SYMBOL_VALUE_ADDRESS (sym) == 0
18508 && !dwarf2_per_objfile->has_section_at_zero)
18510 /* When a static variable is eliminated by the linker,
18511 the corresponding debug information is not stripped
18512 out, but the variable address is set to null;
18513 do not add such variables into symbol table. */
18515 else if (attr2 && (DW_UNSND (attr2) != 0))
18517 /* Workaround gfortran PR debug/40040 - it uses
18518 DW_AT_location for variables in -fPIC libraries which may
18519 get overriden by other libraries/executable and get
18520 a different address. Resolve it by the minimal symbol
18521 which may come from inferior's executable using copy
18522 relocation. Make this workaround only for gfortran as for
18523 other compilers GDB cannot guess the minimal symbol
18524 Fortran mangling kind. */
18525 if (cu->language == language_fortran && die->parent
18526 && die->parent->tag == DW_TAG_module
18528 && startswith (cu->producer, "GNU Fortran"))
18529 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
18531 /* A variable with DW_AT_external is never static,
18532 but it may be block-scoped. */
18533 list_to_add = (cu->list_in_scope == &file_symbols
18534 ? &global_symbols : cu->list_in_scope);
18537 list_to_add = cu->list_in_scope;
18541 /* We do not know the address of this symbol.
18542 If it is an external symbol and we have type information
18543 for it, enter the symbol as a LOC_UNRESOLVED symbol.
18544 The address of the variable will then be determined from
18545 the minimal symbol table whenever the variable is
18547 attr2 = dwarf2_attr (die, DW_AT_external, cu);
18549 /* Fortran explicitly imports any global symbols to the local
18550 scope by DW_TAG_common_block. */
18551 if (cu->language == language_fortran && die->parent
18552 && die->parent->tag == DW_TAG_common_block)
18554 /* SYMBOL_CLASS doesn't matter here because
18555 read_common_block is going to reset it. */
18557 list_to_add = cu->list_in_scope;
18559 else if (attr2 && (DW_UNSND (attr2) != 0)
18560 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
18562 /* A variable with DW_AT_external is never static, but it
18563 may be block-scoped. */
18564 list_to_add = (cu->list_in_scope == &file_symbols
18565 ? &global_symbols : cu->list_in_scope);
18567 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
18569 else if (!die_is_declaration (die, cu))
18571 /* Use the default LOC_OPTIMIZED_OUT class. */
18572 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
18574 list_to_add = cu->list_in_scope;
18578 case DW_TAG_formal_parameter:
18579 /* If we are inside a function, mark this as an argument. If
18580 not, we might be looking at an argument to an inlined function
18581 when we do not have enough information to show inlined frames;
18582 pretend it's a local variable in that case so that the user can
18584 if (context_stack_depth > 0
18585 && context_stack[context_stack_depth - 1].name != NULL)
18586 SYMBOL_IS_ARGUMENT (sym) = 1;
18587 attr = dwarf2_attr (die, DW_AT_location, cu);
18590 var_decode_location (attr, sym, cu);
18592 attr = dwarf2_attr (die, DW_AT_const_value, cu);
18595 dwarf2_const_value (attr, sym, cu);
18598 list_to_add = cu->list_in_scope;
18600 case DW_TAG_unspecified_parameters:
18601 /* From varargs functions; gdb doesn't seem to have any
18602 interest in this information, so just ignore it for now.
18605 case DW_TAG_template_type_param:
18607 /* Fall through. */
18608 case DW_TAG_class_type:
18609 case DW_TAG_interface_type:
18610 case DW_TAG_structure_type:
18611 case DW_TAG_union_type:
18612 case DW_TAG_set_type:
18613 case DW_TAG_enumeration_type:
18614 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
18615 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
18618 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
18619 really ever be static objects: otherwise, if you try
18620 to, say, break of a class's method and you're in a file
18621 which doesn't mention that class, it won't work unless
18622 the check for all static symbols in lookup_symbol_aux
18623 saves you. See the OtherFileClass tests in
18624 gdb.c++/namespace.exp. */
18628 list_to_add = (cu->list_in_scope == &file_symbols
18629 && cu->language == language_cplus
18630 ? &global_symbols : cu->list_in_scope);
18632 /* The semantics of C++ state that "struct foo {
18633 ... }" also defines a typedef for "foo". */
18634 if (cu->language == language_cplus
18635 || cu->language == language_ada
18636 || cu->language == language_d
18637 || cu->language == language_rust)
18639 /* The symbol's name is already allocated along
18640 with this objfile, so we don't need to
18641 duplicate it for the type. */
18642 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
18643 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
18648 case DW_TAG_typedef:
18649 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
18650 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
18651 list_to_add = cu->list_in_scope;
18653 case DW_TAG_base_type:
18654 case DW_TAG_subrange_type:
18655 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
18656 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
18657 list_to_add = cu->list_in_scope;
18659 case DW_TAG_enumerator:
18660 attr = dwarf2_attr (die, DW_AT_const_value, cu);
18663 dwarf2_const_value (attr, sym, cu);
18666 /* NOTE: carlton/2003-11-10: See comment above in the
18667 DW_TAG_class_type, etc. block. */
18669 list_to_add = (cu->list_in_scope == &file_symbols
18670 && cu->language == language_cplus
18671 ? &global_symbols : cu->list_in_scope);
18674 case DW_TAG_imported_declaration:
18675 case DW_TAG_namespace:
18676 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
18677 list_to_add = &global_symbols;
18679 case DW_TAG_module:
18680 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
18681 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
18682 list_to_add = &global_symbols;
18684 case DW_TAG_common_block:
18685 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
18686 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
18687 add_symbol_to_list (sym, cu->list_in_scope);
18690 /* Not a tag we recognize. Hopefully we aren't processing
18691 trash data, but since we must specifically ignore things
18692 we don't recognize, there is nothing else we should do at
18694 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
18695 dwarf_tag_name (die->tag));
18701 sym->hash_next = objfile->template_symbols;
18702 objfile->template_symbols = sym;
18703 list_to_add = NULL;
18706 if (list_to_add != NULL)
18707 add_symbol_to_list (sym, list_to_add);
18709 /* For the benefit of old versions of GCC, check for anonymous
18710 namespaces based on the demangled name. */
18711 if (!cu->processing_has_namespace_info
18712 && cu->language == language_cplus)
18713 cp_scan_for_anonymous_namespaces (sym, objfile);
18718 /* A wrapper for new_symbol_full that always allocates a new symbol. */
18720 static struct symbol *
18721 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
18723 return new_symbol_full (die, type, cu, NULL);
18726 /* Given an attr with a DW_FORM_dataN value in host byte order,
18727 zero-extend it as appropriate for the symbol's type. The DWARF
18728 standard (v4) is not entirely clear about the meaning of using
18729 DW_FORM_dataN for a constant with a signed type, where the type is
18730 wider than the data. The conclusion of a discussion on the DWARF
18731 list was that this is unspecified. We choose to always zero-extend
18732 because that is the interpretation long in use by GCC. */
18735 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
18736 struct dwarf2_cu *cu, LONGEST *value, int bits)
18738 struct objfile *objfile = cu->objfile;
18739 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
18740 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
18741 LONGEST l = DW_UNSND (attr);
18743 if (bits < sizeof (*value) * 8)
18745 l &= ((LONGEST) 1 << bits) - 1;
18748 else if (bits == sizeof (*value) * 8)
18752 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
18753 store_unsigned_integer (bytes, bits / 8, byte_order, l);
18760 /* Read a constant value from an attribute. Either set *VALUE, or if
18761 the value does not fit in *VALUE, set *BYTES - either already
18762 allocated on the objfile obstack, or newly allocated on OBSTACK,
18763 or, set *BATON, if we translated the constant to a location
18767 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
18768 const char *name, struct obstack *obstack,
18769 struct dwarf2_cu *cu,
18770 LONGEST *value, const gdb_byte **bytes,
18771 struct dwarf2_locexpr_baton **baton)
18773 struct objfile *objfile = cu->objfile;
18774 struct comp_unit_head *cu_header = &cu->header;
18775 struct dwarf_block *blk;
18776 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
18777 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
18783 switch (attr->form)
18786 case DW_FORM_GNU_addr_index:
18790 if (TYPE_LENGTH (type) != cu_header->addr_size)
18791 dwarf2_const_value_length_mismatch_complaint (name,
18792 cu_header->addr_size,
18793 TYPE_LENGTH (type));
18794 /* Symbols of this form are reasonably rare, so we just
18795 piggyback on the existing location code rather than writing
18796 a new implementation of symbol_computed_ops. */
18797 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
18798 (*baton)->per_cu = cu->per_cu;
18799 gdb_assert ((*baton)->per_cu);
18801 (*baton)->size = 2 + cu_header->addr_size;
18802 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
18803 (*baton)->data = data;
18805 data[0] = DW_OP_addr;
18806 store_unsigned_integer (&data[1], cu_header->addr_size,
18807 byte_order, DW_ADDR (attr));
18808 data[cu_header->addr_size + 1] = DW_OP_stack_value;
18811 case DW_FORM_string:
18813 case DW_FORM_GNU_str_index:
18814 case DW_FORM_GNU_strp_alt:
18815 /* DW_STRING is already allocated on the objfile obstack, point
18817 *bytes = (const gdb_byte *) DW_STRING (attr);
18819 case DW_FORM_block1:
18820 case DW_FORM_block2:
18821 case DW_FORM_block4:
18822 case DW_FORM_block:
18823 case DW_FORM_exprloc:
18824 blk = DW_BLOCK (attr);
18825 if (TYPE_LENGTH (type) != blk->size)
18826 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
18827 TYPE_LENGTH (type));
18828 *bytes = blk->data;
18831 /* The DW_AT_const_value attributes are supposed to carry the
18832 symbol's value "represented as it would be on the target
18833 architecture." By the time we get here, it's already been
18834 converted to host endianness, so we just need to sign- or
18835 zero-extend it as appropriate. */
18836 case DW_FORM_data1:
18837 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
18839 case DW_FORM_data2:
18840 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
18842 case DW_FORM_data4:
18843 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
18845 case DW_FORM_data8:
18846 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
18849 case DW_FORM_sdata:
18850 *value = DW_SND (attr);
18853 case DW_FORM_udata:
18854 *value = DW_UNSND (attr);
18858 complaint (&symfile_complaints,
18859 _("unsupported const value attribute form: '%s'"),
18860 dwarf_form_name (attr->form));
18867 /* Copy constant value from an attribute to a symbol. */
18870 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
18871 struct dwarf2_cu *cu)
18873 struct objfile *objfile = cu->objfile;
18875 const gdb_byte *bytes;
18876 struct dwarf2_locexpr_baton *baton;
18878 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
18879 SYMBOL_PRINT_NAME (sym),
18880 &objfile->objfile_obstack, cu,
18881 &value, &bytes, &baton);
18885 SYMBOL_LOCATION_BATON (sym) = baton;
18886 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
18888 else if (bytes != NULL)
18890 SYMBOL_VALUE_BYTES (sym) = bytes;
18891 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
18895 SYMBOL_VALUE (sym) = value;
18896 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
18900 /* Return the type of the die in question using its DW_AT_type attribute. */
18902 static struct type *
18903 die_type (struct die_info *die, struct dwarf2_cu *cu)
18905 struct attribute *type_attr;
18907 type_attr = dwarf2_attr (die, DW_AT_type, cu);
18910 /* A missing DW_AT_type represents a void type. */
18911 return objfile_type (cu->objfile)->builtin_void;
18914 return lookup_die_type (die, type_attr, cu);
18917 /* True iff CU's producer generates GNAT Ada auxiliary information
18918 that allows to find parallel types through that information instead
18919 of having to do expensive parallel lookups by type name. */
18922 need_gnat_info (struct dwarf2_cu *cu)
18924 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
18925 of GNAT produces this auxiliary information, without any indication
18926 that it is produced. Part of enhancing the FSF version of GNAT
18927 to produce that information will be to put in place an indicator
18928 that we can use in order to determine whether the descriptive type
18929 info is available or not. One suggestion that has been made is
18930 to use a new attribute, attached to the CU die. For now, assume
18931 that the descriptive type info is not available. */
18935 /* Return the auxiliary type of the die in question using its
18936 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
18937 attribute is not present. */
18939 static struct type *
18940 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
18942 struct attribute *type_attr;
18944 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
18948 return lookup_die_type (die, type_attr, cu);
18951 /* If DIE has a descriptive_type attribute, then set the TYPE's
18952 descriptive type accordingly. */
18955 set_descriptive_type (struct type *type, struct die_info *die,
18956 struct dwarf2_cu *cu)
18958 struct type *descriptive_type = die_descriptive_type (die, cu);
18960 if (descriptive_type)
18962 ALLOCATE_GNAT_AUX_TYPE (type);
18963 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
18967 /* Return the containing type of the die in question using its
18968 DW_AT_containing_type attribute. */
18970 static struct type *
18971 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
18973 struct attribute *type_attr;
18975 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
18977 error (_("Dwarf Error: Problem turning containing type into gdb type "
18978 "[in module %s]"), objfile_name (cu->objfile));
18980 return lookup_die_type (die, type_attr, cu);
18983 /* Return an error marker type to use for the ill formed type in DIE/CU. */
18985 static struct type *
18986 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
18988 struct objfile *objfile = dwarf2_per_objfile->objfile;
18989 char *message, *saved;
18991 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
18992 objfile_name (objfile),
18993 cu->header.offset.sect_off,
18994 die->offset.sect_off);
18995 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
18996 message, strlen (message));
18999 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
19002 /* Look up the type of DIE in CU using its type attribute ATTR.
19003 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
19004 DW_AT_containing_type.
19005 If there is no type substitute an error marker. */
19007 static struct type *
19008 lookup_die_type (struct die_info *die, const struct attribute *attr,
19009 struct dwarf2_cu *cu)
19011 struct objfile *objfile = cu->objfile;
19012 struct type *this_type;
19014 gdb_assert (attr->name == DW_AT_type
19015 || attr->name == DW_AT_GNAT_descriptive_type
19016 || attr->name == DW_AT_containing_type);
19018 /* First see if we have it cached. */
19020 if (attr->form == DW_FORM_GNU_ref_alt)
19022 struct dwarf2_per_cu_data *per_cu;
19023 sect_offset offset = dwarf2_get_ref_die_offset (attr);
19025 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
19026 this_type = get_die_type_at_offset (offset, per_cu);
19028 else if (attr_form_is_ref (attr))
19030 sect_offset offset = dwarf2_get_ref_die_offset (attr);
19032 this_type = get_die_type_at_offset (offset, cu->per_cu);
19034 else if (attr->form == DW_FORM_ref_sig8)
19036 ULONGEST signature = DW_SIGNATURE (attr);
19038 return get_signatured_type (die, signature, cu);
19042 complaint (&symfile_complaints,
19043 _("Dwarf Error: Bad type attribute %s in DIE"
19044 " at 0x%x [in module %s]"),
19045 dwarf_attr_name (attr->name), die->offset.sect_off,
19046 objfile_name (objfile));
19047 return build_error_marker_type (cu, die);
19050 /* If not cached we need to read it in. */
19052 if (this_type == NULL)
19054 struct die_info *type_die = NULL;
19055 struct dwarf2_cu *type_cu = cu;
19057 if (attr_form_is_ref (attr))
19058 type_die = follow_die_ref (die, attr, &type_cu);
19059 if (type_die == NULL)
19060 return build_error_marker_type (cu, die);
19061 /* If we find the type now, it's probably because the type came
19062 from an inter-CU reference and the type's CU got expanded before
19064 this_type = read_type_die (type_die, type_cu);
19067 /* If we still don't have a type use an error marker. */
19069 if (this_type == NULL)
19070 return build_error_marker_type (cu, die);
19075 /* Return the type in DIE, CU.
19076 Returns NULL for invalid types.
19078 This first does a lookup in die_type_hash,
19079 and only reads the die in if necessary.
19081 NOTE: This can be called when reading in partial or full symbols. */
19083 static struct type *
19084 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
19086 struct type *this_type;
19088 this_type = get_die_type (die, cu);
19092 return read_type_die_1 (die, cu);
19095 /* Read the type in DIE, CU.
19096 Returns NULL for invalid types. */
19098 static struct type *
19099 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
19101 struct type *this_type = NULL;
19105 case DW_TAG_class_type:
19106 case DW_TAG_interface_type:
19107 case DW_TAG_structure_type:
19108 case DW_TAG_union_type:
19109 this_type = read_structure_type (die, cu);
19111 case DW_TAG_enumeration_type:
19112 this_type = read_enumeration_type (die, cu);
19114 case DW_TAG_subprogram:
19115 case DW_TAG_subroutine_type:
19116 case DW_TAG_inlined_subroutine:
19117 this_type = read_subroutine_type (die, cu);
19119 case DW_TAG_array_type:
19120 this_type = read_array_type (die, cu);
19122 case DW_TAG_set_type:
19123 this_type = read_set_type (die, cu);
19125 case DW_TAG_pointer_type:
19126 this_type = read_tag_pointer_type (die, cu);
19128 case DW_TAG_ptr_to_member_type:
19129 this_type = read_tag_ptr_to_member_type (die, cu);
19131 case DW_TAG_reference_type:
19132 this_type = read_tag_reference_type (die, cu);
19134 case DW_TAG_const_type:
19135 this_type = read_tag_const_type (die, cu);
19137 case DW_TAG_volatile_type:
19138 this_type = read_tag_volatile_type (die, cu);
19140 case DW_TAG_restrict_type:
19141 this_type = read_tag_restrict_type (die, cu);
19143 case DW_TAG_string_type:
19144 this_type = read_tag_string_type (die, cu);
19146 case DW_TAG_typedef:
19147 this_type = read_typedef (die, cu);
19149 case DW_TAG_subrange_type:
19150 this_type = read_subrange_type (die, cu);
19152 case DW_TAG_base_type:
19153 this_type = read_base_type (die, cu);
19155 case DW_TAG_unspecified_type:
19156 this_type = read_unspecified_type (die, cu);
19158 case DW_TAG_namespace:
19159 this_type = read_namespace_type (die, cu);
19161 case DW_TAG_module:
19162 this_type = read_module_type (die, cu);
19164 case DW_TAG_atomic_type:
19165 this_type = read_tag_atomic_type (die, cu);
19168 complaint (&symfile_complaints,
19169 _("unexpected tag in read_type_die: '%s'"),
19170 dwarf_tag_name (die->tag));
19177 /* See if we can figure out if the class lives in a namespace. We do
19178 this by looking for a member function; its demangled name will
19179 contain namespace info, if there is any.
19180 Return the computed name or NULL.
19181 Space for the result is allocated on the objfile's obstack.
19182 This is the full-die version of guess_partial_die_structure_name.
19183 In this case we know DIE has no useful parent. */
19186 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
19188 struct die_info *spec_die;
19189 struct dwarf2_cu *spec_cu;
19190 struct die_info *child;
19193 spec_die = die_specification (die, &spec_cu);
19194 if (spec_die != NULL)
19200 for (child = die->child;
19202 child = child->sibling)
19204 if (child->tag == DW_TAG_subprogram)
19206 const char *linkage_name;
19208 linkage_name = dwarf2_string_attr (child, DW_AT_linkage_name, cu);
19209 if (linkage_name == NULL)
19210 linkage_name = dwarf2_string_attr (child, DW_AT_MIPS_linkage_name,
19212 if (linkage_name != NULL)
19215 = language_class_name_from_physname (cu->language_defn,
19219 if (actual_name != NULL)
19221 const char *die_name = dwarf2_name (die, cu);
19223 if (die_name != NULL
19224 && strcmp (die_name, actual_name) != 0)
19226 /* Strip off the class name from the full name.
19227 We want the prefix. */
19228 int die_name_len = strlen (die_name);
19229 int actual_name_len = strlen (actual_name);
19231 /* Test for '::' as a sanity check. */
19232 if (actual_name_len > die_name_len + 2
19233 && actual_name[actual_name_len
19234 - die_name_len - 1] == ':')
19235 name = (char *) obstack_copy0 (
19236 &cu->objfile->per_bfd->storage_obstack,
19237 actual_name, actual_name_len - die_name_len - 2);
19240 xfree (actual_name);
19249 /* GCC might emit a nameless typedef that has a linkage name. Determine the
19250 prefix part in such case. See
19251 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19254 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
19256 struct attribute *attr;
19259 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
19260 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
19263 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
19266 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
19268 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
19269 if (attr == NULL || DW_STRING (attr) == NULL)
19272 /* dwarf2_name had to be already called. */
19273 gdb_assert (DW_STRING_IS_CANONICAL (attr));
19275 /* Strip the base name, keep any leading namespaces/classes. */
19276 base = strrchr (DW_STRING (attr), ':');
19277 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
19280 return (char *) obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
19282 &base[-1] - DW_STRING (attr));
19285 /* Return the name of the namespace/class that DIE is defined within,
19286 or "" if we can't tell. The caller should not xfree the result.
19288 For example, if we're within the method foo() in the following
19298 then determine_prefix on foo's die will return "N::C". */
19300 static const char *
19301 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
19303 struct die_info *parent, *spec_die;
19304 struct dwarf2_cu *spec_cu;
19305 struct type *parent_type;
19308 if (cu->language != language_cplus
19309 && cu->language != language_fortran && cu->language != language_d
19310 && cu->language != language_rust)
19313 retval = anonymous_struct_prefix (die, cu);
19317 /* We have to be careful in the presence of DW_AT_specification.
19318 For example, with GCC 3.4, given the code
19322 // Definition of N::foo.
19326 then we'll have a tree of DIEs like this:
19328 1: DW_TAG_compile_unit
19329 2: DW_TAG_namespace // N
19330 3: DW_TAG_subprogram // declaration of N::foo
19331 4: DW_TAG_subprogram // definition of N::foo
19332 DW_AT_specification // refers to die #3
19334 Thus, when processing die #4, we have to pretend that we're in
19335 the context of its DW_AT_specification, namely the contex of die
19338 spec_die = die_specification (die, &spec_cu);
19339 if (spec_die == NULL)
19340 parent = die->parent;
19343 parent = spec_die->parent;
19347 if (parent == NULL)
19349 else if (parent->building_fullname)
19352 const char *parent_name;
19354 /* It has been seen on RealView 2.2 built binaries,
19355 DW_TAG_template_type_param types actually _defined_ as
19356 children of the parent class:
19359 template class <class Enum> Class{};
19360 Class<enum E> class_e;
19362 1: DW_TAG_class_type (Class)
19363 2: DW_TAG_enumeration_type (E)
19364 3: DW_TAG_enumerator (enum1:0)
19365 3: DW_TAG_enumerator (enum2:1)
19367 2: DW_TAG_template_type_param
19368 DW_AT_type DW_FORM_ref_udata (E)
19370 Besides being broken debug info, it can put GDB into an
19371 infinite loop. Consider:
19373 When we're building the full name for Class<E>, we'll start
19374 at Class, and go look over its template type parameters,
19375 finding E. We'll then try to build the full name of E, and
19376 reach here. We're now trying to build the full name of E,
19377 and look over the parent DIE for containing scope. In the
19378 broken case, if we followed the parent DIE of E, we'd again
19379 find Class, and once again go look at its template type
19380 arguments, etc., etc. Simply don't consider such parent die
19381 as source-level parent of this die (it can't be, the language
19382 doesn't allow it), and break the loop here. */
19383 name = dwarf2_name (die, cu);
19384 parent_name = dwarf2_name (parent, cu);
19385 complaint (&symfile_complaints,
19386 _("template param type '%s' defined within parent '%s'"),
19387 name ? name : "<unknown>",
19388 parent_name ? parent_name : "<unknown>");
19392 switch (parent->tag)
19394 case DW_TAG_namespace:
19395 parent_type = read_type_die (parent, cu);
19396 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
19397 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
19398 Work around this problem here. */
19399 if (cu->language == language_cplus
19400 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
19402 /* We give a name to even anonymous namespaces. */
19403 return TYPE_TAG_NAME (parent_type);
19404 case DW_TAG_class_type:
19405 case DW_TAG_interface_type:
19406 case DW_TAG_structure_type:
19407 case DW_TAG_union_type:
19408 case DW_TAG_module:
19409 parent_type = read_type_die (parent, cu);
19410 if (TYPE_TAG_NAME (parent_type) != NULL)
19411 return TYPE_TAG_NAME (parent_type);
19413 /* An anonymous structure is only allowed non-static data
19414 members; no typedefs, no member functions, et cetera.
19415 So it does not need a prefix. */
19417 case DW_TAG_compile_unit:
19418 case DW_TAG_partial_unit:
19419 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
19420 if (cu->language == language_cplus
19421 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
19422 && die->child != NULL
19423 && (die->tag == DW_TAG_class_type
19424 || die->tag == DW_TAG_structure_type
19425 || die->tag == DW_TAG_union_type))
19427 char *name = guess_full_die_structure_name (die, cu);
19432 case DW_TAG_enumeration_type:
19433 parent_type = read_type_die (parent, cu);
19434 if (TYPE_DECLARED_CLASS (parent_type))
19436 if (TYPE_TAG_NAME (parent_type) != NULL)
19437 return TYPE_TAG_NAME (parent_type);
19440 /* Fall through. */
19442 return determine_prefix (parent, cu);
19446 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
19447 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
19448 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
19449 an obconcat, otherwise allocate storage for the result. The CU argument is
19450 used to determine the language and hence, the appropriate separator. */
19452 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
19455 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
19456 int physname, struct dwarf2_cu *cu)
19458 const char *lead = "";
19461 if (suffix == NULL || suffix[0] == '\0'
19462 || prefix == NULL || prefix[0] == '\0')
19464 else if (cu->language == language_d)
19466 /* For D, the 'main' function could be defined in any module, but it
19467 should never be prefixed. */
19468 if (strcmp (suffix, "D main") == 0)
19476 else if (cu->language == language_fortran && physname)
19478 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
19479 DW_AT_MIPS_linkage_name is preferred and used instead. */
19487 if (prefix == NULL)
19489 if (suffix == NULL)
19496 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
19498 strcpy (retval, lead);
19499 strcat (retval, prefix);
19500 strcat (retval, sep);
19501 strcat (retval, suffix);
19506 /* We have an obstack. */
19507 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
19511 /* Return sibling of die, NULL if no sibling. */
19513 static struct die_info *
19514 sibling_die (struct die_info *die)
19516 return die->sibling;
19519 /* Get name of a die, return NULL if not found. */
19521 static const char *
19522 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
19523 struct obstack *obstack)
19525 if (name && cu->language == language_cplus)
19527 char *canon_name = cp_canonicalize_string (name);
19529 if (canon_name != NULL)
19531 if (strcmp (canon_name, name) != 0)
19532 name = (const char *) obstack_copy0 (obstack, canon_name,
19533 strlen (canon_name));
19534 xfree (canon_name);
19541 /* Get name of a die, return NULL if not found.
19542 Anonymous namespaces are converted to their magic string. */
19544 static const char *
19545 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
19547 struct attribute *attr;
19549 attr = dwarf2_attr (die, DW_AT_name, cu);
19550 if ((!attr || !DW_STRING (attr))
19551 && die->tag != DW_TAG_namespace
19552 && die->tag != DW_TAG_class_type
19553 && die->tag != DW_TAG_interface_type
19554 && die->tag != DW_TAG_structure_type
19555 && die->tag != DW_TAG_union_type)
19560 case DW_TAG_compile_unit:
19561 case DW_TAG_partial_unit:
19562 /* Compilation units have a DW_AT_name that is a filename, not
19563 a source language identifier. */
19564 case DW_TAG_enumeration_type:
19565 case DW_TAG_enumerator:
19566 /* These tags always have simple identifiers already; no need
19567 to canonicalize them. */
19568 return DW_STRING (attr);
19570 case DW_TAG_namespace:
19571 if (attr != NULL && DW_STRING (attr) != NULL)
19572 return DW_STRING (attr);
19573 return CP_ANONYMOUS_NAMESPACE_STR;
19575 case DW_TAG_class_type:
19576 case DW_TAG_interface_type:
19577 case DW_TAG_structure_type:
19578 case DW_TAG_union_type:
19579 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
19580 structures or unions. These were of the form "._%d" in GCC 4.1,
19581 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
19582 and GCC 4.4. We work around this problem by ignoring these. */
19583 if (attr && DW_STRING (attr)
19584 && (startswith (DW_STRING (attr), "._")
19585 || startswith (DW_STRING (attr), "<anonymous")))
19588 /* GCC might emit a nameless typedef that has a linkage name. See
19589 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19590 if (!attr || DW_STRING (attr) == NULL)
19592 char *demangled = NULL;
19594 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
19596 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
19598 if (attr == NULL || DW_STRING (attr) == NULL)
19601 /* Avoid demangling DW_STRING (attr) the second time on a second
19602 call for the same DIE. */
19603 if (!DW_STRING_IS_CANONICAL (attr))
19604 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
19610 /* FIXME: we already did this for the partial symbol... */
19613 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
19614 demangled, strlen (demangled)));
19615 DW_STRING_IS_CANONICAL (attr) = 1;
19618 /* Strip any leading namespaces/classes, keep only the base name.
19619 DW_AT_name for named DIEs does not contain the prefixes. */
19620 base = strrchr (DW_STRING (attr), ':');
19621 if (base && base > DW_STRING (attr) && base[-1] == ':')
19624 return DW_STRING (attr);
19633 if (!DW_STRING_IS_CANONICAL (attr))
19636 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
19637 &cu->objfile->per_bfd->storage_obstack);
19638 DW_STRING_IS_CANONICAL (attr) = 1;
19640 return DW_STRING (attr);
19643 /* Return the die that this die in an extension of, or NULL if there
19644 is none. *EXT_CU is the CU containing DIE on input, and the CU
19645 containing the return value on output. */
19647 static struct die_info *
19648 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
19650 struct attribute *attr;
19652 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
19656 return follow_die_ref (die, attr, ext_cu);
19659 /* Convert a DIE tag into its string name. */
19661 static const char *
19662 dwarf_tag_name (unsigned tag)
19664 const char *name = get_DW_TAG_name (tag);
19667 return "DW_TAG_<unknown>";
19672 /* Convert a DWARF attribute code into its string name. */
19674 static const char *
19675 dwarf_attr_name (unsigned attr)
19679 #ifdef MIPS /* collides with DW_AT_HP_block_index */
19680 if (attr == DW_AT_MIPS_fde)
19681 return "DW_AT_MIPS_fde";
19683 if (attr == DW_AT_HP_block_index)
19684 return "DW_AT_HP_block_index";
19687 name = get_DW_AT_name (attr);
19690 return "DW_AT_<unknown>";
19695 /* Convert a DWARF value form code into its string name. */
19697 static const char *
19698 dwarf_form_name (unsigned form)
19700 const char *name = get_DW_FORM_name (form);
19703 return "DW_FORM_<unknown>";
19709 dwarf_bool_name (unsigned mybool)
19717 /* Convert a DWARF type code into its string name. */
19719 static const char *
19720 dwarf_type_encoding_name (unsigned enc)
19722 const char *name = get_DW_ATE_name (enc);
19725 return "DW_ATE_<unknown>";
19731 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
19735 print_spaces (indent, f);
19736 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
19737 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
19739 if (die->parent != NULL)
19741 print_spaces (indent, f);
19742 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
19743 die->parent->offset.sect_off);
19746 print_spaces (indent, f);
19747 fprintf_unfiltered (f, " has children: %s\n",
19748 dwarf_bool_name (die->child != NULL));
19750 print_spaces (indent, f);
19751 fprintf_unfiltered (f, " attributes:\n");
19753 for (i = 0; i < die->num_attrs; ++i)
19755 print_spaces (indent, f);
19756 fprintf_unfiltered (f, " %s (%s) ",
19757 dwarf_attr_name (die->attrs[i].name),
19758 dwarf_form_name (die->attrs[i].form));
19760 switch (die->attrs[i].form)
19763 case DW_FORM_GNU_addr_index:
19764 fprintf_unfiltered (f, "address: ");
19765 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
19767 case DW_FORM_block2:
19768 case DW_FORM_block4:
19769 case DW_FORM_block:
19770 case DW_FORM_block1:
19771 fprintf_unfiltered (f, "block: size %s",
19772 pulongest (DW_BLOCK (&die->attrs[i])->size));
19774 case DW_FORM_exprloc:
19775 fprintf_unfiltered (f, "expression: size %s",
19776 pulongest (DW_BLOCK (&die->attrs[i])->size));
19778 case DW_FORM_ref_addr:
19779 fprintf_unfiltered (f, "ref address: ");
19780 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
19782 case DW_FORM_GNU_ref_alt:
19783 fprintf_unfiltered (f, "alt ref address: ");
19784 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
19790 case DW_FORM_ref_udata:
19791 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
19792 (long) (DW_UNSND (&die->attrs[i])));
19794 case DW_FORM_data1:
19795 case DW_FORM_data2:
19796 case DW_FORM_data4:
19797 case DW_FORM_data8:
19798 case DW_FORM_udata:
19799 case DW_FORM_sdata:
19800 fprintf_unfiltered (f, "constant: %s",
19801 pulongest (DW_UNSND (&die->attrs[i])));
19803 case DW_FORM_sec_offset:
19804 fprintf_unfiltered (f, "section offset: %s",
19805 pulongest (DW_UNSND (&die->attrs[i])));
19807 case DW_FORM_ref_sig8:
19808 fprintf_unfiltered (f, "signature: %s",
19809 hex_string (DW_SIGNATURE (&die->attrs[i])));
19811 case DW_FORM_string:
19813 case DW_FORM_GNU_str_index:
19814 case DW_FORM_GNU_strp_alt:
19815 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
19816 DW_STRING (&die->attrs[i])
19817 ? DW_STRING (&die->attrs[i]) : "",
19818 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
19821 if (DW_UNSND (&die->attrs[i]))
19822 fprintf_unfiltered (f, "flag: TRUE");
19824 fprintf_unfiltered (f, "flag: FALSE");
19826 case DW_FORM_flag_present:
19827 fprintf_unfiltered (f, "flag: TRUE");
19829 case DW_FORM_indirect:
19830 /* The reader will have reduced the indirect form to
19831 the "base form" so this form should not occur. */
19832 fprintf_unfiltered (f,
19833 "unexpected attribute form: DW_FORM_indirect");
19836 fprintf_unfiltered (f, "unsupported attribute form: %d.",
19837 die->attrs[i].form);
19840 fprintf_unfiltered (f, "\n");
19845 dump_die_for_error (struct die_info *die)
19847 dump_die_shallow (gdb_stderr, 0, die);
19851 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
19853 int indent = level * 4;
19855 gdb_assert (die != NULL);
19857 if (level >= max_level)
19860 dump_die_shallow (f, indent, die);
19862 if (die->child != NULL)
19864 print_spaces (indent, f);
19865 fprintf_unfiltered (f, " Children:");
19866 if (level + 1 < max_level)
19868 fprintf_unfiltered (f, "\n");
19869 dump_die_1 (f, level + 1, max_level, die->child);
19873 fprintf_unfiltered (f,
19874 " [not printed, max nesting level reached]\n");
19878 if (die->sibling != NULL && level > 0)
19880 dump_die_1 (f, level, max_level, die->sibling);
19884 /* This is called from the pdie macro in gdbinit.in.
19885 It's not static so gcc will keep a copy callable from gdb. */
19888 dump_die (struct die_info *die, int max_level)
19890 dump_die_1 (gdb_stdlog, 0, max_level, die);
19894 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
19898 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
19904 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
19908 dwarf2_get_ref_die_offset (const struct attribute *attr)
19910 sect_offset retval = { DW_UNSND (attr) };
19912 if (attr_form_is_ref (attr))
19915 retval.sect_off = 0;
19916 complaint (&symfile_complaints,
19917 _("unsupported die ref attribute form: '%s'"),
19918 dwarf_form_name (attr->form));
19922 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
19923 * the value held by the attribute is not constant. */
19926 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
19928 if (attr->form == DW_FORM_sdata)
19929 return DW_SND (attr);
19930 else if (attr->form == DW_FORM_udata
19931 || attr->form == DW_FORM_data1
19932 || attr->form == DW_FORM_data2
19933 || attr->form == DW_FORM_data4
19934 || attr->form == DW_FORM_data8)
19935 return DW_UNSND (attr);
19938 complaint (&symfile_complaints,
19939 _("Attribute value is not a constant (%s)"),
19940 dwarf_form_name (attr->form));
19941 return default_value;
19945 /* Follow reference or signature attribute ATTR of SRC_DIE.
19946 On entry *REF_CU is the CU of SRC_DIE.
19947 On exit *REF_CU is the CU of the result. */
19949 static struct die_info *
19950 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
19951 struct dwarf2_cu **ref_cu)
19953 struct die_info *die;
19955 if (attr_form_is_ref (attr))
19956 die = follow_die_ref (src_die, attr, ref_cu);
19957 else if (attr->form == DW_FORM_ref_sig8)
19958 die = follow_die_sig (src_die, attr, ref_cu);
19961 dump_die_for_error (src_die);
19962 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
19963 objfile_name ((*ref_cu)->objfile));
19969 /* Follow reference OFFSET.
19970 On entry *REF_CU is the CU of the source die referencing OFFSET.
19971 On exit *REF_CU is the CU of the result.
19972 Returns NULL if OFFSET is invalid. */
19974 static struct die_info *
19975 follow_die_offset (sect_offset offset, int offset_in_dwz,
19976 struct dwarf2_cu **ref_cu)
19978 struct die_info temp_die;
19979 struct dwarf2_cu *target_cu, *cu = *ref_cu;
19981 gdb_assert (cu->per_cu != NULL);
19985 if (cu->per_cu->is_debug_types)
19987 /* .debug_types CUs cannot reference anything outside their CU.
19988 If they need to, they have to reference a signatured type via
19989 DW_FORM_ref_sig8. */
19990 if (! offset_in_cu_p (&cu->header, offset))
19993 else if (offset_in_dwz != cu->per_cu->is_dwz
19994 || ! offset_in_cu_p (&cu->header, offset))
19996 struct dwarf2_per_cu_data *per_cu;
19998 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
20001 /* If necessary, add it to the queue and load its DIEs. */
20002 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
20003 load_full_comp_unit (per_cu, cu->language);
20005 target_cu = per_cu->cu;
20007 else if (cu->dies == NULL)
20009 /* We're loading full DIEs during partial symbol reading. */
20010 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
20011 load_full_comp_unit (cu->per_cu, language_minimal);
20014 *ref_cu = target_cu;
20015 temp_die.offset = offset;
20016 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
20017 &temp_die, offset.sect_off);
20020 /* Follow reference attribute ATTR of SRC_DIE.
20021 On entry *REF_CU is the CU of SRC_DIE.
20022 On exit *REF_CU is the CU of the result. */
20024 static struct die_info *
20025 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
20026 struct dwarf2_cu **ref_cu)
20028 sect_offset offset = dwarf2_get_ref_die_offset (attr);
20029 struct dwarf2_cu *cu = *ref_cu;
20030 struct die_info *die;
20032 die = follow_die_offset (offset,
20033 (attr->form == DW_FORM_GNU_ref_alt
20034 || cu->per_cu->is_dwz),
20037 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
20038 "at 0x%x [in module %s]"),
20039 offset.sect_off, src_die->offset.sect_off,
20040 objfile_name (cu->objfile));
20045 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
20046 Returned value is intended for DW_OP_call*. Returned
20047 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
20049 struct dwarf2_locexpr_baton
20050 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
20051 struct dwarf2_per_cu_data *per_cu,
20052 CORE_ADDR (*get_frame_pc) (void *baton),
20055 struct dwarf2_cu *cu;
20056 struct die_info *die;
20057 struct attribute *attr;
20058 struct dwarf2_locexpr_baton retval;
20060 dw2_setup (per_cu->objfile);
20062 if (per_cu->cu == NULL)
20067 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20068 Instead just throw an error, not much else we can do. */
20069 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20070 offset.sect_off, objfile_name (per_cu->objfile));
20073 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
20075 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20076 offset.sect_off, objfile_name (per_cu->objfile));
20078 attr = dwarf2_attr (die, DW_AT_location, cu);
20081 /* DWARF: "If there is no such attribute, then there is no effect.".
20082 DATA is ignored if SIZE is 0. */
20084 retval.data = NULL;
20087 else if (attr_form_is_section_offset (attr))
20089 struct dwarf2_loclist_baton loclist_baton;
20090 CORE_ADDR pc = (*get_frame_pc) (baton);
20093 fill_in_loclist_baton (cu, &loclist_baton, attr);
20095 retval.data = dwarf2_find_location_expression (&loclist_baton,
20097 retval.size = size;
20101 if (!attr_form_is_block (attr))
20102 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
20103 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
20104 offset.sect_off, objfile_name (per_cu->objfile));
20106 retval.data = DW_BLOCK (attr)->data;
20107 retval.size = DW_BLOCK (attr)->size;
20109 retval.per_cu = cu->per_cu;
20111 age_cached_comp_units ();
20116 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
20119 struct dwarf2_locexpr_baton
20120 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
20121 struct dwarf2_per_cu_data *per_cu,
20122 CORE_ADDR (*get_frame_pc) (void *baton),
20125 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
20127 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
20130 /* Write a constant of a given type as target-ordered bytes into
20133 static const gdb_byte *
20134 write_constant_as_bytes (struct obstack *obstack,
20135 enum bfd_endian byte_order,
20142 *len = TYPE_LENGTH (type);
20143 result = (gdb_byte *) obstack_alloc (obstack, *len);
20144 store_unsigned_integer (result, *len, byte_order, value);
20149 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
20150 pointer to the constant bytes and set LEN to the length of the
20151 data. If memory is needed, allocate it on OBSTACK. If the DIE
20152 does not have a DW_AT_const_value, return NULL. */
20155 dwarf2_fetch_constant_bytes (sect_offset offset,
20156 struct dwarf2_per_cu_data *per_cu,
20157 struct obstack *obstack,
20160 struct dwarf2_cu *cu;
20161 struct die_info *die;
20162 struct attribute *attr;
20163 const gdb_byte *result = NULL;
20166 enum bfd_endian byte_order;
20168 dw2_setup (per_cu->objfile);
20170 if (per_cu->cu == NULL)
20175 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20176 Instead just throw an error, not much else we can do. */
20177 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20178 offset.sect_off, objfile_name (per_cu->objfile));
20181 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
20183 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20184 offset.sect_off, objfile_name (per_cu->objfile));
20187 attr = dwarf2_attr (die, DW_AT_const_value, cu);
20191 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
20192 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
20194 switch (attr->form)
20197 case DW_FORM_GNU_addr_index:
20201 *len = cu->header.addr_size;
20202 tem = (gdb_byte *) obstack_alloc (obstack, *len);
20203 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
20207 case DW_FORM_string:
20209 case DW_FORM_GNU_str_index:
20210 case DW_FORM_GNU_strp_alt:
20211 /* DW_STRING is already allocated on the objfile obstack, point
20213 result = (const gdb_byte *) DW_STRING (attr);
20214 *len = strlen (DW_STRING (attr));
20216 case DW_FORM_block1:
20217 case DW_FORM_block2:
20218 case DW_FORM_block4:
20219 case DW_FORM_block:
20220 case DW_FORM_exprloc:
20221 result = DW_BLOCK (attr)->data;
20222 *len = DW_BLOCK (attr)->size;
20225 /* The DW_AT_const_value attributes are supposed to carry the
20226 symbol's value "represented as it would be on the target
20227 architecture." By the time we get here, it's already been
20228 converted to host endianness, so we just need to sign- or
20229 zero-extend it as appropriate. */
20230 case DW_FORM_data1:
20231 type = die_type (die, cu);
20232 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
20233 if (result == NULL)
20234 result = write_constant_as_bytes (obstack, byte_order,
20237 case DW_FORM_data2:
20238 type = die_type (die, cu);
20239 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
20240 if (result == NULL)
20241 result = write_constant_as_bytes (obstack, byte_order,
20244 case DW_FORM_data4:
20245 type = die_type (die, cu);
20246 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
20247 if (result == NULL)
20248 result = write_constant_as_bytes (obstack, byte_order,
20251 case DW_FORM_data8:
20252 type = die_type (die, cu);
20253 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
20254 if (result == NULL)
20255 result = write_constant_as_bytes (obstack, byte_order,
20259 case DW_FORM_sdata:
20260 type = die_type (die, cu);
20261 result = write_constant_as_bytes (obstack, byte_order,
20262 type, DW_SND (attr), len);
20265 case DW_FORM_udata:
20266 type = die_type (die, cu);
20267 result = write_constant_as_bytes (obstack, byte_order,
20268 type, DW_UNSND (attr), len);
20272 complaint (&symfile_complaints,
20273 _("unsupported const value attribute form: '%s'"),
20274 dwarf_form_name (attr->form));
20281 /* Return the type of the DIE at DIE_OFFSET in the CU named by
20285 dwarf2_get_die_type (cu_offset die_offset,
20286 struct dwarf2_per_cu_data *per_cu)
20288 sect_offset die_offset_sect;
20290 dw2_setup (per_cu->objfile);
20292 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
20293 return get_die_type_at_offset (die_offset_sect, per_cu);
20296 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
20297 On entry *REF_CU is the CU of SRC_DIE.
20298 On exit *REF_CU is the CU of the result.
20299 Returns NULL if the referenced DIE isn't found. */
20301 static struct die_info *
20302 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
20303 struct dwarf2_cu **ref_cu)
20305 struct die_info temp_die;
20306 struct dwarf2_cu *sig_cu;
20307 struct die_info *die;
20309 /* While it might be nice to assert sig_type->type == NULL here,
20310 we can get here for DW_AT_imported_declaration where we need
20311 the DIE not the type. */
20313 /* If necessary, add it to the queue and load its DIEs. */
20315 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
20316 read_signatured_type (sig_type);
20318 sig_cu = sig_type->per_cu.cu;
20319 gdb_assert (sig_cu != NULL);
20320 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
20321 temp_die.offset = sig_type->type_offset_in_section;
20322 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
20323 temp_die.offset.sect_off);
20326 /* For .gdb_index version 7 keep track of included TUs.
20327 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
20328 if (dwarf2_per_objfile->index_table != NULL
20329 && dwarf2_per_objfile->index_table->version <= 7)
20331 VEC_safe_push (dwarf2_per_cu_ptr,
20332 (*ref_cu)->per_cu->imported_symtabs,
20343 /* Follow signatured type referenced by ATTR in SRC_DIE.
20344 On entry *REF_CU is the CU of SRC_DIE.
20345 On exit *REF_CU is the CU of the result.
20346 The result is the DIE of the type.
20347 If the referenced type cannot be found an error is thrown. */
20349 static struct die_info *
20350 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
20351 struct dwarf2_cu **ref_cu)
20353 ULONGEST signature = DW_SIGNATURE (attr);
20354 struct signatured_type *sig_type;
20355 struct die_info *die;
20357 gdb_assert (attr->form == DW_FORM_ref_sig8);
20359 sig_type = lookup_signatured_type (*ref_cu, signature);
20360 /* sig_type will be NULL if the signatured type is missing from
20362 if (sig_type == NULL)
20364 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
20365 " from DIE at 0x%x [in module %s]"),
20366 hex_string (signature), src_die->offset.sect_off,
20367 objfile_name ((*ref_cu)->objfile));
20370 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
20373 dump_die_for_error (src_die);
20374 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
20375 " from DIE at 0x%x [in module %s]"),
20376 hex_string (signature), src_die->offset.sect_off,
20377 objfile_name ((*ref_cu)->objfile));
20383 /* Get the type specified by SIGNATURE referenced in DIE/CU,
20384 reading in and processing the type unit if necessary. */
20386 static struct type *
20387 get_signatured_type (struct die_info *die, ULONGEST signature,
20388 struct dwarf2_cu *cu)
20390 struct signatured_type *sig_type;
20391 struct dwarf2_cu *type_cu;
20392 struct die_info *type_die;
20395 sig_type = lookup_signatured_type (cu, signature);
20396 /* sig_type will be NULL if the signatured type is missing from
20398 if (sig_type == NULL)
20400 complaint (&symfile_complaints,
20401 _("Dwarf Error: Cannot find signatured DIE %s referenced"
20402 " from DIE at 0x%x [in module %s]"),
20403 hex_string (signature), die->offset.sect_off,
20404 objfile_name (dwarf2_per_objfile->objfile));
20405 return build_error_marker_type (cu, die);
20408 /* If we already know the type we're done. */
20409 if (sig_type->type != NULL)
20410 return sig_type->type;
20413 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
20414 if (type_die != NULL)
20416 /* N.B. We need to call get_die_type to ensure only one type for this DIE
20417 is created. This is important, for example, because for c++ classes
20418 we need TYPE_NAME set which is only done by new_symbol. Blech. */
20419 type = read_type_die (type_die, type_cu);
20422 complaint (&symfile_complaints,
20423 _("Dwarf Error: Cannot build signatured type %s"
20424 " referenced from DIE at 0x%x [in module %s]"),
20425 hex_string (signature), die->offset.sect_off,
20426 objfile_name (dwarf2_per_objfile->objfile));
20427 type = build_error_marker_type (cu, die);
20432 complaint (&symfile_complaints,
20433 _("Dwarf Error: Problem reading signatured DIE %s referenced"
20434 " from DIE at 0x%x [in module %s]"),
20435 hex_string (signature), die->offset.sect_off,
20436 objfile_name (dwarf2_per_objfile->objfile));
20437 type = build_error_marker_type (cu, die);
20439 sig_type->type = type;
20444 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
20445 reading in and processing the type unit if necessary. */
20447 static struct type *
20448 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
20449 struct dwarf2_cu *cu) /* ARI: editCase function */
20451 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
20452 if (attr_form_is_ref (attr))
20454 struct dwarf2_cu *type_cu = cu;
20455 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
20457 return read_type_die (type_die, type_cu);
20459 else if (attr->form == DW_FORM_ref_sig8)
20461 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
20465 complaint (&symfile_complaints,
20466 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
20467 " at 0x%x [in module %s]"),
20468 dwarf_form_name (attr->form), die->offset.sect_off,
20469 objfile_name (dwarf2_per_objfile->objfile));
20470 return build_error_marker_type (cu, die);
20474 /* Load the DIEs associated with type unit PER_CU into memory. */
20477 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
20479 struct signatured_type *sig_type;
20481 /* Caller is responsible for ensuring type_unit_groups don't get here. */
20482 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
20484 /* We have the per_cu, but we need the signatured_type.
20485 Fortunately this is an easy translation. */
20486 gdb_assert (per_cu->is_debug_types);
20487 sig_type = (struct signatured_type *) per_cu;
20489 gdb_assert (per_cu->cu == NULL);
20491 read_signatured_type (sig_type);
20493 gdb_assert (per_cu->cu != NULL);
20496 /* die_reader_func for read_signatured_type.
20497 This is identical to load_full_comp_unit_reader,
20498 but is kept separate for now. */
20501 read_signatured_type_reader (const struct die_reader_specs *reader,
20502 const gdb_byte *info_ptr,
20503 struct die_info *comp_unit_die,
20507 struct dwarf2_cu *cu = reader->cu;
20509 gdb_assert (cu->die_hash == NULL);
20511 htab_create_alloc_ex (cu->header.length / 12,
20515 &cu->comp_unit_obstack,
20516 hashtab_obstack_allocate,
20517 dummy_obstack_deallocate);
20520 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
20521 &info_ptr, comp_unit_die);
20522 cu->dies = comp_unit_die;
20523 /* comp_unit_die is not stored in die_hash, no need. */
20525 /* We try not to read any attributes in this function, because not
20526 all CUs needed for references have been loaded yet, and symbol
20527 table processing isn't initialized. But we have to set the CU language,
20528 or we won't be able to build types correctly.
20529 Similarly, if we do not read the producer, we can not apply
20530 producer-specific interpretation. */
20531 prepare_one_comp_unit (cu, cu->dies, language_minimal);
20534 /* Read in a signatured type and build its CU and DIEs.
20535 If the type is a stub for the real type in a DWO file,
20536 read in the real type from the DWO file as well. */
20539 read_signatured_type (struct signatured_type *sig_type)
20541 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
20543 gdb_assert (per_cu->is_debug_types);
20544 gdb_assert (per_cu->cu == NULL);
20546 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
20547 read_signatured_type_reader, NULL);
20548 sig_type->per_cu.tu_read = 1;
20551 /* Decode simple location descriptions.
20552 Given a pointer to a dwarf block that defines a location, compute
20553 the location and return the value.
20555 NOTE drow/2003-11-18: This function is called in two situations
20556 now: for the address of static or global variables (partial symbols
20557 only) and for offsets into structures which are expected to be
20558 (more or less) constant. The partial symbol case should go away,
20559 and only the constant case should remain. That will let this
20560 function complain more accurately. A few special modes are allowed
20561 without complaint for global variables (for instance, global
20562 register values and thread-local values).
20564 A location description containing no operations indicates that the
20565 object is optimized out. The return value is 0 for that case.
20566 FIXME drow/2003-11-16: No callers check for this case any more; soon all
20567 callers will only want a very basic result and this can become a
20570 Note that stack[0] is unused except as a default error return. */
20573 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
20575 struct objfile *objfile = cu->objfile;
20577 size_t size = blk->size;
20578 const gdb_byte *data = blk->data;
20579 CORE_ADDR stack[64];
20581 unsigned int bytes_read, unsnd;
20587 stack[++stacki] = 0;
20626 stack[++stacki] = op - DW_OP_lit0;
20661 stack[++stacki] = op - DW_OP_reg0;
20663 dwarf2_complex_location_expr_complaint ();
20667 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
20669 stack[++stacki] = unsnd;
20671 dwarf2_complex_location_expr_complaint ();
20675 stack[++stacki] = read_address (objfile->obfd, &data[i],
20680 case DW_OP_const1u:
20681 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
20685 case DW_OP_const1s:
20686 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
20690 case DW_OP_const2u:
20691 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
20695 case DW_OP_const2s:
20696 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
20700 case DW_OP_const4u:
20701 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
20705 case DW_OP_const4s:
20706 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
20710 case DW_OP_const8u:
20711 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
20716 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
20722 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
20727 stack[stacki + 1] = stack[stacki];
20732 stack[stacki - 1] += stack[stacki];
20736 case DW_OP_plus_uconst:
20737 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
20743 stack[stacki - 1] -= stack[stacki];
20748 /* If we're not the last op, then we definitely can't encode
20749 this using GDB's address_class enum. This is valid for partial
20750 global symbols, although the variable's address will be bogus
20753 dwarf2_complex_location_expr_complaint ();
20756 case DW_OP_GNU_push_tls_address:
20757 case DW_OP_form_tls_address:
20758 /* The top of the stack has the offset from the beginning
20759 of the thread control block at which the variable is located. */
20760 /* Nothing should follow this operator, so the top of stack would
20762 /* This is valid for partial global symbols, but the variable's
20763 address will be bogus in the psymtab. Make it always at least
20764 non-zero to not look as a variable garbage collected by linker
20765 which have DW_OP_addr 0. */
20767 dwarf2_complex_location_expr_complaint ();
20771 case DW_OP_GNU_uninit:
20774 case DW_OP_GNU_addr_index:
20775 case DW_OP_GNU_const_index:
20776 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
20783 const char *name = get_DW_OP_name (op);
20786 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
20789 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
20793 return (stack[stacki]);
20796 /* Enforce maximum stack depth of SIZE-1 to avoid writing
20797 outside of the allocated space. Also enforce minimum>0. */
20798 if (stacki >= ARRAY_SIZE (stack) - 1)
20800 complaint (&symfile_complaints,
20801 _("location description stack overflow"));
20807 complaint (&symfile_complaints,
20808 _("location description stack underflow"));
20812 return (stack[stacki]);
20815 /* memory allocation interface */
20817 static struct dwarf_block *
20818 dwarf_alloc_block (struct dwarf2_cu *cu)
20820 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
20823 static struct die_info *
20824 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
20826 struct die_info *die;
20827 size_t size = sizeof (struct die_info);
20830 size += (num_attrs - 1) * sizeof (struct attribute);
20832 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
20833 memset (die, 0, sizeof (struct die_info));
20838 /* Macro support. */
20840 /* Return file name relative to the compilation directory of file number I in
20841 *LH's file name table. The result is allocated using xmalloc; the caller is
20842 responsible for freeing it. */
20845 file_file_name (int file, struct line_header *lh)
20847 /* Is the file number a valid index into the line header's file name
20848 table? Remember that file numbers start with one, not zero. */
20849 if (1 <= file && file <= lh->num_file_names)
20851 struct file_entry *fe = &lh->file_names[file - 1];
20853 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0
20854 || lh->include_dirs == NULL)
20855 return xstrdup (fe->name);
20856 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
20857 fe->name, (char *) NULL);
20861 /* The compiler produced a bogus file number. We can at least
20862 record the macro definitions made in the file, even if we
20863 won't be able to find the file by name. */
20864 char fake_name[80];
20866 xsnprintf (fake_name, sizeof (fake_name),
20867 "<bad macro file number %d>", file);
20869 complaint (&symfile_complaints,
20870 _("bad file number in macro information (%d)"),
20873 return xstrdup (fake_name);
20877 /* Return the full name of file number I in *LH's file name table.
20878 Use COMP_DIR as the name of the current directory of the
20879 compilation. The result is allocated using xmalloc; the caller is
20880 responsible for freeing it. */
20882 file_full_name (int file, struct line_header *lh, const char *comp_dir)
20884 /* Is the file number a valid index into the line header's file name
20885 table? Remember that file numbers start with one, not zero. */
20886 if (1 <= file && file <= lh->num_file_names)
20888 char *relative = file_file_name (file, lh);
20890 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
20892 return reconcat (relative, comp_dir, SLASH_STRING,
20893 relative, (char *) NULL);
20896 return file_file_name (file, lh);
20900 static struct macro_source_file *
20901 macro_start_file (int file, int line,
20902 struct macro_source_file *current_file,
20903 struct line_header *lh)
20905 /* File name relative to the compilation directory of this source file. */
20906 char *file_name = file_file_name (file, lh);
20908 if (! current_file)
20910 /* Note: We don't create a macro table for this compilation unit
20911 at all until we actually get a filename. */
20912 struct macro_table *macro_table = get_macro_table ();
20914 /* If we have no current file, then this must be the start_file
20915 directive for the compilation unit's main source file. */
20916 current_file = macro_set_main (macro_table, file_name);
20917 macro_define_special (macro_table);
20920 current_file = macro_include (current_file, line, file_name);
20924 return current_file;
20928 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
20929 followed by a null byte. */
20931 copy_string (const char *buf, int len)
20933 char *s = (char *) xmalloc (len + 1);
20935 memcpy (s, buf, len);
20941 static const char *
20942 consume_improper_spaces (const char *p, const char *body)
20946 complaint (&symfile_complaints,
20947 _("macro definition contains spaces "
20948 "in formal argument list:\n`%s'"),
20960 parse_macro_definition (struct macro_source_file *file, int line,
20965 /* The body string takes one of two forms. For object-like macro
20966 definitions, it should be:
20968 <macro name> " " <definition>
20970 For function-like macro definitions, it should be:
20972 <macro name> "() " <definition>
20974 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
20976 Spaces may appear only where explicitly indicated, and in the
20979 The Dwarf 2 spec says that an object-like macro's name is always
20980 followed by a space, but versions of GCC around March 2002 omit
20981 the space when the macro's definition is the empty string.
20983 The Dwarf 2 spec says that there should be no spaces between the
20984 formal arguments in a function-like macro's formal argument list,
20985 but versions of GCC around March 2002 include spaces after the
20989 /* Find the extent of the macro name. The macro name is terminated
20990 by either a space or null character (for an object-like macro) or
20991 an opening paren (for a function-like macro). */
20992 for (p = body; *p; p++)
20993 if (*p == ' ' || *p == '(')
20996 if (*p == ' ' || *p == '\0')
20998 /* It's an object-like macro. */
20999 int name_len = p - body;
21000 char *name = copy_string (body, name_len);
21001 const char *replacement;
21004 replacement = body + name_len + 1;
21007 dwarf2_macro_malformed_definition_complaint (body);
21008 replacement = body + name_len;
21011 macro_define_object (file, line, name, replacement);
21015 else if (*p == '(')
21017 /* It's a function-like macro. */
21018 char *name = copy_string (body, p - body);
21021 char **argv = XNEWVEC (char *, argv_size);
21025 p = consume_improper_spaces (p, body);
21027 /* Parse the formal argument list. */
21028 while (*p && *p != ')')
21030 /* Find the extent of the current argument name. */
21031 const char *arg_start = p;
21033 while (*p && *p != ',' && *p != ')' && *p != ' ')
21036 if (! *p || p == arg_start)
21037 dwarf2_macro_malformed_definition_complaint (body);
21040 /* Make sure argv has room for the new argument. */
21041 if (argc >= argv_size)
21044 argv = XRESIZEVEC (char *, argv, argv_size);
21047 argv[argc++] = copy_string (arg_start, p - arg_start);
21050 p = consume_improper_spaces (p, body);
21052 /* Consume the comma, if present. */
21057 p = consume_improper_spaces (p, body);
21066 /* Perfectly formed definition, no complaints. */
21067 macro_define_function (file, line, name,
21068 argc, (const char **) argv,
21070 else if (*p == '\0')
21072 /* Complain, but do define it. */
21073 dwarf2_macro_malformed_definition_complaint (body);
21074 macro_define_function (file, line, name,
21075 argc, (const char **) argv,
21079 /* Just complain. */
21080 dwarf2_macro_malformed_definition_complaint (body);
21083 /* Just complain. */
21084 dwarf2_macro_malformed_definition_complaint (body);
21090 for (i = 0; i < argc; i++)
21096 dwarf2_macro_malformed_definition_complaint (body);
21099 /* Skip some bytes from BYTES according to the form given in FORM.
21100 Returns the new pointer. */
21102 static const gdb_byte *
21103 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
21104 enum dwarf_form form,
21105 unsigned int offset_size,
21106 struct dwarf2_section_info *section)
21108 unsigned int bytes_read;
21112 case DW_FORM_data1:
21117 case DW_FORM_data2:
21121 case DW_FORM_data4:
21125 case DW_FORM_data8:
21129 case DW_FORM_string:
21130 read_direct_string (abfd, bytes, &bytes_read);
21131 bytes += bytes_read;
21134 case DW_FORM_sec_offset:
21136 case DW_FORM_GNU_strp_alt:
21137 bytes += offset_size;
21140 case DW_FORM_block:
21141 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
21142 bytes += bytes_read;
21145 case DW_FORM_block1:
21146 bytes += 1 + read_1_byte (abfd, bytes);
21148 case DW_FORM_block2:
21149 bytes += 2 + read_2_bytes (abfd, bytes);
21151 case DW_FORM_block4:
21152 bytes += 4 + read_4_bytes (abfd, bytes);
21155 case DW_FORM_sdata:
21156 case DW_FORM_udata:
21157 case DW_FORM_GNU_addr_index:
21158 case DW_FORM_GNU_str_index:
21159 bytes = gdb_skip_leb128 (bytes, buffer_end);
21162 dwarf2_section_buffer_overflow_complaint (section);
21170 complaint (&symfile_complaints,
21171 _("invalid form 0x%x in `%s'"),
21172 form, get_section_name (section));
21180 /* A helper for dwarf_decode_macros that handles skipping an unknown
21181 opcode. Returns an updated pointer to the macro data buffer; or,
21182 on error, issues a complaint and returns NULL. */
21184 static const gdb_byte *
21185 skip_unknown_opcode (unsigned int opcode,
21186 const gdb_byte **opcode_definitions,
21187 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
21189 unsigned int offset_size,
21190 struct dwarf2_section_info *section)
21192 unsigned int bytes_read, i;
21194 const gdb_byte *defn;
21196 if (opcode_definitions[opcode] == NULL)
21198 complaint (&symfile_complaints,
21199 _("unrecognized DW_MACFINO opcode 0x%x"),
21204 defn = opcode_definitions[opcode];
21205 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
21206 defn += bytes_read;
21208 for (i = 0; i < arg; ++i)
21210 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
21211 (enum dwarf_form) defn[i], offset_size,
21213 if (mac_ptr == NULL)
21215 /* skip_form_bytes already issued the complaint. */
21223 /* A helper function which parses the header of a macro section.
21224 If the macro section is the extended (for now called "GNU") type,
21225 then this updates *OFFSET_SIZE. Returns a pointer to just after
21226 the header, or issues a complaint and returns NULL on error. */
21228 static const gdb_byte *
21229 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
21231 const gdb_byte *mac_ptr,
21232 unsigned int *offset_size,
21233 int section_is_gnu)
21235 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
21237 if (section_is_gnu)
21239 unsigned int version, flags;
21241 version = read_2_bytes (abfd, mac_ptr);
21244 complaint (&symfile_complaints,
21245 _("unrecognized version `%d' in .debug_macro section"),
21251 flags = read_1_byte (abfd, mac_ptr);
21253 *offset_size = (flags & 1) ? 8 : 4;
21255 if ((flags & 2) != 0)
21256 /* We don't need the line table offset. */
21257 mac_ptr += *offset_size;
21259 /* Vendor opcode descriptions. */
21260 if ((flags & 4) != 0)
21262 unsigned int i, count;
21264 count = read_1_byte (abfd, mac_ptr);
21266 for (i = 0; i < count; ++i)
21268 unsigned int opcode, bytes_read;
21271 opcode = read_1_byte (abfd, mac_ptr);
21273 opcode_definitions[opcode] = mac_ptr;
21274 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21275 mac_ptr += bytes_read;
21284 /* A helper for dwarf_decode_macros that handles the GNU extensions,
21285 including DW_MACRO_GNU_transparent_include. */
21288 dwarf_decode_macro_bytes (bfd *abfd,
21289 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
21290 struct macro_source_file *current_file,
21291 struct line_header *lh,
21292 struct dwarf2_section_info *section,
21293 int section_is_gnu, int section_is_dwz,
21294 unsigned int offset_size,
21295 htab_t include_hash)
21297 struct objfile *objfile = dwarf2_per_objfile->objfile;
21298 enum dwarf_macro_record_type macinfo_type;
21299 int at_commandline;
21300 const gdb_byte *opcode_definitions[256];
21302 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
21303 &offset_size, section_is_gnu);
21304 if (mac_ptr == NULL)
21306 /* We already issued a complaint. */
21310 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
21311 GDB is still reading the definitions from command line. First
21312 DW_MACINFO_start_file will need to be ignored as it was already executed
21313 to create CURRENT_FILE for the main source holding also the command line
21314 definitions. On first met DW_MACINFO_start_file this flag is reset to
21315 normally execute all the remaining DW_MACINFO_start_file macinfos. */
21317 at_commandline = 1;
21321 /* Do we at least have room for a macinfo type byte? */
21322 if (mac_ptr >= mac_end)
21324 dwarf2_section_buffer_overflow_complaint (section);
21328 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
21331 /* Note that we rely on the fact that the corresponding GNU and
21332 DWARF constants are the same. */
21333 switch (macinfo_type)
21335 /* A zero macinfo type indicates the end of the macro
21340 case DW_MACRO_GNU_define:
21341 case DW_MACRO_GNU_undef:
21342 case DW_MACRO_GNU_define_indirect:
21343 case DW_MACRO_GNU_undef_indirect:
21344 case DW_MACRO_GNU_define_indirect_alt:
21345 case DW_MACRO_GNU_undef_indirect_alt:
21347 unsigned int bytes_read;
21352 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21353 mac_ptr += bytes_read;
21355 if (macinfo_type == DW_MACRO_GNU_define
21356 || macinfo_type == DW_MACRO_GNU_undef)
21358 body = read_direct_string (abfd, mac_ptr, &bytes_read);
21359 mac_ptr += bytes_read;
21363 LONGEST str_offset;
21365 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
21366 mac_ptr += offset_size;
21368 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
21369 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
21372 struct dwz_file *dwz = dwarf2_get_dwz_file ();
21374 body = read_indirect_string_from_dwz (dwz, str_offset);
21377 body = read_indirect_string_at_offset (abfd, str_offset);
21380 is_define = (macinfo_type == DW_MACRO_GNU_define
21381 || macinfo_type == DW_MACRO_GNU_define_indirect
21382 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
21383 if (! current_file)
21385 /* DWARF violation as no main source is present. */
21386 complaint (&symfile_complaints,
21387 _("debug info with no main source gives macro %s "
21389 is_define ? _("definition") : _("undefinition"),
21393 if ((line == 0 && !at_commandline)
21394 || (line != 0 && at_commandline))
21395 complaint (&symfile_complaints,
21396 _("debug info gives %s macro %s with %s line %d: %s"),
21397 at_commandline ? _("command-line") : _("in-file"),
21398 is_define ? _("definition") : _("undefinition"),
21399 line == 0 ? _("zero") : _("non-zero"), line, body);
21402 parse_macro_definition (current_file, line, body);
21405 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
21406 || macinfo_type == DW_MACRO_GNU_undef_indirect
21407 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
21408 macro_undef (current_file, line, body);
21413 case DW_MACRO_GNU_start_file:
21415 unsigned int bytes_read;
21418 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21419 mac_ptr += bytes_read;
21420 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21421 mac_ptr += bytes_read;
21423 if ((line == 0 && !at_commandline)
21424 || (line != 0 && at_commandline))
21425 complaint (&symfile_complaints,
21426 _("debug info gives source %d included "
21427 "from %s at %s line %d"),
21428 file, at_commandline ? _("command-line") : _("file"),
21429 line == 0 ? _("zero") : _("non-zero"), line);
21431 if (at_commandline)
21433 /* This DW_MACRO_GNU_start_file was executed in the
21435 at_commandline = 0;
21438 current_file = macro_start_file (file, line, current_file, lh);
21442 case DW_MACRO_GNU_end_file:
21443 if (! current_file)
21444 complaint (&symfile_complaints,
21445 _("macro debug info has an unmatched "
21446 "`close_file' directive"));
21449 current_file = current_file->included_by;
21450 if (! current_file)
21452 enum dwarf_macro_record_type next_type;
21454 /* GCC circa March 2002 doesn't produce the zero
21455 type byte marking the end of the compilation
21456 unit. Complain if it's not there, but exit no
21459 /* Do we at least have room for a macinfo type byte? */
21460 if (mac_ptr >= mac_end)
21462 dwarf2_section_buffer_overflow_complaint (section);
21466 /* We don't increment mac_ptr here, so this is just
21469 = (enum dwarf_macro_record_type) read_1_byte (abfd,
21471 if (next_type != 0)
21472 complaint (&symfile_complaints,
21473 _("no terminating 0-type entry for "
21474 "macros in `.debug_macinfo' section"));
21481 case DW_MACRO_GNU_transparent_include:
21482 case DW_MACRO_GNU_transparent_include_alt:
21486 bfd *include_bfd = abfd;
21487 struct dwarf2_section_info *include_section = section;
21488 const gdb_byte *include_mac_end = mac_end;
21489 int is_dwz = section_is_dwz;
21490 const gdb_byte *new_mac_ptr;
21492 offset = read_offset_1 (abfd, mac_ptr, offset_size);
21493 mac_ptr += offset_size;
21495 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
21497 struct dwz_file *dwz = dwarf2_get_dwz_file ();
21499 dwarf2_read_section (objfile, &dwz->macro);
21501 include_section = &dwz->macro;
21502 include_bfd = get_section_bfd_owner (include_section);
21503 include_mac_end = dwz->macro.buffer + dwz->macro.size;
21507 new_mac_ptr = include_section->buffer + offset;
21508 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
21512 /* This has actually happened; see
21513 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
21514 complaint (&symfile_complaints,
21515 _("recursive DW_MACRO_GNU_transparent_include in "
21516 ".debug_macro section"));
21520 *slot = (void *) new_mac_ptr;
21522 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
21523 include_mac_end, current_file, lh,
21524 section, section_is_gnu, is_dwz,
21525 offset_size, include_hash);
21527 htab_remove_elt (include_hash, (void *) new_mac_ptr);
21532 case DW_MACINFO_vendor_ext:
21533 if (!section_is_gnu)
21535 unsigned int bytes_read;
21537 /* This reads the constant, but since we don't recognize
21538 any vendor extensions, we ignore it. */
21539 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21540 mac_ptr += bytes_read;
21541 read_direct_string (abfd, mac_ptr, &bytes_read);
21542 mac_ptr += bytes_read;
21544 /* We don't recognize any vendor extensions. */
21550 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
21551 mac_ptr, mac_end, abfd, offset_size,
21553 if (mac_ptr == NULL)
21557 } while (macinfo_type != 0);
21561 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
21562 int section_is_gnu)
21564 struct objfile *objfile = dwarf2_per_objfile->objfile;
21565 struct line_header *lh = cu->line_header;
21567 const gdb_byte *mac_ptr, *mac_end;
21568 struct macro_source_file *current_file = 0;
21569 enum dwarf_macro_record_type macinfo_type;
21570 unsigned int offset_size = cu->header.offset_size;
21571 const gdb_byte *opcode_definitions[256];
21572 struct cleanup *cleanup;
21573 htab_t include_hash;
21575 struct dwarf2_section_info *section;
21576 const char *section_name;
21578 if (cu->dwo_unit != NULL)
21580 if (section_is_gnu)
21582 section = &cu->dwo_unit->dwo_file->sections.macro;
21583 section_name = ".debug_macro.dwo";
21587 section = &cu->dwo_unit->dwo_file->sections.macinfo;
21588 section_name = ".debug_macinfo.dwo";
21593 if (section_is_gnu)
21595 section = &dwarf2_per_objfile->macro;
21596 section_name = ".debug_macro";
21600 section = &dwarf2_per_objfile->macinfo;
21601 section_name = ".debug_macinfo";
21605 dwarf2_read_section (objfile, section);
21606 if (section->buffer == NULL)
21608 complaint (&symfile_complaints, _("missing %s section"), section_name);
21611 abfd = get_section_bfd_owner (section);
21613 /* First pass: Find the name of the base filename.
21614 This filename is needed in order to process all macros whose definition
21615 (or undefinition) comes from the command line. These macros are defined
21616 before the first DW_MACINFO_start_file entry, and yet still need to be
21617 associated to the base file.
21619 To determine the base file name, we scan the macro definitions until we
21620 reach the first DW_MACINFO_start_file entry. We then initialize
21621 CURRENT_FILE accordingly so that any macro definition found before the
21622 first DW_MACINFO_start_file can still be associated to the base file. */
21624 mac_ptr = section->buffer + offset;
21625 mac_end = section->buffer + section->size;
21627 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
21628 &offset_size, section_is_gnu);
21629 if (mac_ptr == NULL)
21631 /* We already issued a complaint. */
21637 /* Do we at least have room for a macinfo type byte? */
21638 if (mac_ptr >= mac_end)
21640 /* Complaint is printed during the second pass as GDB will probably
21641 stop the first pass earlier upon finding
21642 DW_MACINFO_start_file. */
21646 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
21649 /* Note that we rely on the fact that the corresponding GNU and
21650 DWARF constants are the same. */
21651 switch (macinfo_type)
21653 /* A zero macinfo type indicates the end of the macro
21658 case DW_MACRO_GNU_define:
21659 case DW_MACRO_GNU_undef:
21660 /* Only skip the data by MAC_PTR. */
21662 unsigned int bytes_read;
21664 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21665 mac_ptr += bytes_read;
21666 read_direct_string (abfd, mac_ptr, &bytes_read);
21667 mac_ptr += bytes_read;
21671 case DW_MACRO_GNU_start_file:
21673 unsigned int bytes_read;
21676 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21677 mac_ptr += bytes_read;
21678 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21679 mac_ptr += bytes_read;
21681 current_file = macro_start_file (file, line, current_file, lh);
21685 case DW_MACRO_GNU_end_file:
21686 /* No data to skip by MAC_PTR. */
21689 case DW_MACRO_GNU_define_indirect:
21690 case DW_MACRO_GNU_undef_indirect:
21691 case DW_MACRO_GNU_define_indirect_alt:
21692 case DW_MACRO_GNU_undef_indirect_alt:
21694 unsigned int bytes_read;
21696 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21697 mac_ptr += bytes_read;
21698 mac_ptr += offset_size;
21702 case DW_MACRO_GNU_transparent_include:
21703 case DW_MACRO_GNU_transparent_include_alt:
21704 /* Note that, according to the spec, a transparent include
21705 chain cannot call DW_MACRO_GNU_start_file. So, we can just
21706 skip this opcode. */
21707 mac_ptr += offset_size;
21710 case DW_MACINFO_vendor_ext:
21711 /* Only skip the data by MAC_PTR. */
21712 if (!section_is_gnu)
21714 unsigned int bytes_read;
21716 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21717 mac_ptr += bytes_read;
21718 read_direct_string (abfd, mac_ptr, &bytes_read);
21719 mac_ptr += bytes_read;
21724 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
21725 mac_ptr, mac_end, abfd, offset_size,
21727 if (mac_ptr == NULL)
21731 } while (macinfo_type != 0 && current_file == NULL);
21733 /* Second pass: Process all entries.
21735 Use the AT_COMMAND_LINE flag to determine whether we are still processing
21736 command-line macro definitions/undefinitions. This flag is unset when we
21737 reach the first DW_MACINFO_start_file entry. */
21739 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
21740 NULL, xcalloc, xfree);
21741 cleanup = make_cleanup_htab_delete (include_hash);
21742 mac_ptr = section->buffer + offset;
21743 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
21744 *slot = (void *) mac_ptr;
21745 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
21746 current_file, lh, section,
21747 section_is_gnu, 0, offset_size, include_hash);
21748 do_cleanups (cleanup);
21751 /* Check if the attribute's form is a DW_FORM_block*
21752 if so return true else false. */
21755 attr_form_is_block (const struct attribute *attr)
21757 return (attr == NULL ? 0 :
21758 attr->form == DW_FORM_block1
21759 || attr->form == DW_FORM_block2
21760 || attr->form == DW_FORM_block4
21761 || attr->form == DW_FORM_block
21762 || attr->form == DW_FORM_exprloc);
21765 /* Return non-zero if ATTR's value is a section offset --- classes
21766 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
21767 You may use DW_UNSND (attr) to retrieve such offsets.
21769 Section 7.5.4, "Attribute Encodings", explains that no attribute
21770 may have a value that belongs to more than one of these classes; it
21771 would be ambiguous if we did, because we use the same forms for all
21775 attr_form_is_section_offset (const struct attribute *attr)
21777 return (attr->form == DW_FORM_data4
21778 || attr->form == DW_FORM_data8
21779 || attr->form == DW_FORM_sec_offset);
21782 /* Return non-zero if ATTR's value falls in the 'constant' class, or
21783 zero otherwise. When this function returns true, you can apply
21784 dwarf2_get_attr_constant_value to it.
21786 However, note that for some attributes you must check
21787 attr_form_is_section_offset before using this test. DW_FORM_data4
21788 and DW_FORM_data8 are members of both the constant class, and of
21789 the classes that contain offsets into other debug sections
21790 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
21791 that, if an attribute's can be either a constant or one of the
21792 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
21793 taken as section offsets, not constants. */
21796 attr_form_is_constant (const struct attribute *attr)
21798 switch (attr->form)
21800 case DW_FORM_sdata:
21801 case DW_FORM_udata:
21802 case DW_FORM_data1:
21803 case DW_FORM_data2:
21804 case DW_FORM_data4:
21805 case DW_FORM_data8:
21813 /* DW_ADDR is always stored already as sect_offset; despite for the forms
21814 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
21817 attr_form_is_ref (const struct attribute *attr)
21819 switch (attr->form)
21821 case DW_FORM_ref_addr:
21826 case DW_FORM_ref_udata:
21827 case DW_FORM_GNU_ref_alt:
21834 /* Return the .debug_loc section to use for CU.
21835 For DWO files use .debug_loc.dwo. */
21837 static struct dwarf2_section_info *
21838 cu_debug_loc_section (struct dwarf2_cu *cu)
21841 return &cu->dwo_unit->dwo_file->sections.loc;
21842 return &dwarf2_per_objfile->loc;
21845 /* A helper function that fills in a dwarf2_loclist_baton. */
21848 fill_in_loclist_baton (struct dwarf2_cu *cu,
21849 struct dwarf2_loclist_baton *baton,
21850 const struct attribute *attr)
21852 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
21854 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
21856 baton->per_cu = cu->per_cu;
21857 gdb_assert (baton->per_cu);
21858 /* We don't know how long the location list is, but make sure we
21859 don't run off the edge of the section. */
21860 baton->size = section->size - DW_UNSND (attr);
21861 baton->data = section->buffer + DW_UNSND (attr);
21862 baton->base_address = cu->base_address;
21863 baton->from_dwo = cu->dwo_unit != NULL;
21867 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
21868 struct dwarf2_cu *cu, int is_block)
21870 struct objfile *objfile = dwarf2_per_objfile->objfile;
21871 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
21873 if (attr_form_is_section_offset (attr)
21874 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
21875 the section. If so, fall through to the complaint in the
21877 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
21879 struct dwarf2_loclist_baton *baton;
21881 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
21883 fill_in_loclist_baton (cu, baton, attr);
21885 if (cu->base_known == 0)
21886 complaint (&symfile_complaints,
21887 _("Location list used without "
21888 "specifying the CU base address."));
21890 SYMBOL_ACLASS_INDEX (sym) = (is_block
21891 ? dwarf2_loclist_block_index
21892 : dwarf2_loclist_index);
21893 SYMBOL_LOCATION_BATON (sym) = baton;
21897 struct dwarf2_locexpr_baton *baton;
21899 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
21900 baton->per_cu = cu->per_cu;
21901 gdb_assert (baton->per_cu);
21903 if (attr_form_is_block (attr))
21905 /* Note that we're just copying the block's data pointer
21906 here, not the actual data. We're still pointing into the
21907 info_buffer for SYM's objfile; right now we never release
21908 that buffer, but when we do clean up properly this may
21910 baton->size = DW_BLOCK (attr)->size;
21911 baton->data = DW_BLOCK (attr)->data;
21915 dwarf2_invalid_attrib_class_complaint ("location description",
21916 SYMBOL_NATURAL_NAME (sym));
21920 SYMBOL_ACLASS_INDEX (sym) = (is_block
21921 ? dwarf2_locexpr_block_index
21922 : dwarf2_locexpr_index);
21923 SYMBOL_LOCATION_BATON (sym) = baton;
21927 /* Return the OBJFILE associated with the compilation unit CU. If CU
21928 came from a separate debuginfo file, then the master objfile is
21932 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
21934 struct objfile *objfile = per_cu->objfile;
21936 /* Return the master objfile, so that we can report and look up the
21937 correct file containing this variable. */
21938 if (objfile->separate_debug_objfile_backlink)
21939 objfile = objfile->separate_debug_objfile_backlink;
21944 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
21945 (CU_HEADERP is unused in such case) or prepare a temporary copy at
21946 CU_HEADERP first. */
21948 static const struct comp_unit_head *
21949 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
21950 struct dwarf2_per_cu_data *per_cu)
21952 const gdb_byte *info_ptr;
21955 return &per_cu->cu->header;
21957 info_ptr = per_cu->section->buffer + per_cu->offset.sect_off;
21959 memset (cu_headerp, 0, sizeof (*cu_headerp));
21960 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
21965 /* Return the address size given in the compilation unit header for CU. */
21968 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
21970 struct comp_unit_head cu_header_local;
21971 const struct comp_unit_head *cu_headerp;
21973 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
21975 return cu_headerp->addr_size;
21978 /* Return the offset size given in the compilation unit header for CU. */
21981 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
21983 struct comp_unit_head cu_header_local;
21984 const struct comp_unit_head *cu_headerp;
21986 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
21988 return cu_headerp->offset_size;
21991 /* See its dwarf2loc.h declaration. */
21994 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
21996 struct comp_unit_head cu_header_local;
21997 const struct comp_unit_head *cu_headerp;
21999 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22001 if (cu_headerp->version == 2)
22002 return cu_headerp->addr_size;
22004 return cu_headerp->offset_size;
22007 /* Return the text offset of the CU. The returned offset comes from
22008 this CU's objfile. If this objfile came from a separate debuginfo
22009 file, then the offset may be different from the corresponding
22010 offset in the parent objfile. */
22013 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
22015 struct objfile *objfile = per_cu->objfile;
22017 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
22020 /* Locate the .debug_info compilation unit from CU's objfile which contains
22021 the DIE at OFFSET. Raises an error on failure. */
22023 static struct dwarf2_per_cu_data *
22024 dwarf2_find_containing_comp_unit (sect_offset offset,
22025 unsigned int offset_in_dwz,
22026 struct objfile *objfile)
22028 struct dwarf2_per_cu_data *this_cu;
22030 const sect_offset *cu_off;
22033 high = dwarf2_per_objfile->n_comp_units - 1;
22036 struct dwarf2_per_cu_data *mid_cu;
22037 int mid = low + (high - low) / 2;
22039 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
22040 cu_off = &mid_cu->offset;
22041 if (mid_cu->is_dwz > offset_in_dwz
22042 || (mid_cu->is_dwz == offset_in_dwz
22043 && cu_off->sect_off >= offset.sect_off))
22048 gdb_assert (low == high);
22049 this_cu = dwarf2_per_objfile->all_comp_units[low];
22050 cu_off = &this_cu->offset;
22051 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
22053 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
22054 error (_("Dwarf Error: could not find partial DIE containing "
22055 "offset 0x%lx [in module %s]"),
22056 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
22058 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
22059 <= offset.sect_off);
22060 return dwarf2_per_objfile->all_comp_units[low-1];
22064 this_cu = dwarf2_per_objfile->all_comp_units[low];
22065 if (low == dwarf2_per_objfile->n_comp_units - 1
22066 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
22067 error (_("invalid dwarf2 offset %u"), offset.sect_off);
22068 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
22073 /* Initialize dwarf2_cu CU, owned by PER_CU. */
22076 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
22078 memset (cu, 0, sizeof (*cu));
22080 cu->per_cu = per_cu;
22081 cu->objfile = per_cu->objfile;
22082 obstack_init (&cu->comp_unit_obstack);
22085 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
22088 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
22089 enum language pretend_language)
22091 struct attribute *attr;
22093 /* Set the language we're debugging. */
22094 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
22096 set_cu_language (DW_UNSND (attr), cu);
22099 cu->language = pretend_language;
22100 cu->language_defn = language_def (cu->language);
22103 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
22106 /* Release one cached compilation unit, CU. We unlink it from the tree
22107 of compilation units, but we don't remove it from the read_in_chain;
22108 the caller is responsible for that.
22109 NOTE: DATA is a void * because this function is also used as a
22110 cleanup routine. */
22113 free_heap_comp_unit (void *data)
22115 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22117 gdb_assert (cu->per_cu != NULL);
22118 cu->per_cu->cu = NULL;
22121 obstack_free (&cu->comp_unit_obstack, NULL);
22126 /* This cleanup function is passed the address of a dwarf2_cu on the stack
22127 when we're finished with it. We can't free the pointer itself, but be
22128 sure to unlink it from the cache. Also release any associated storage. */
22131 free_stack_comp_unit (void *data)
22133 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22135 gdb_assert (cu->per_cu != NULL);
22136 cu->per_cu->cu = NULL;
22139 obstack_free (&cu->comp_unit_obstack, NULL);
22140 cu->partial_dies = NULL;
22143 /* Free all cached compilation units. */
22146 free_cached_comp_units (void *data)
22148 struct dwarf2_per_cu_data *per_cu, **last_chain;
22150 per_cu = dwarf2_per_objfile->read_in_chain;
22151 last_chain = &dwarf2_per_objfile->read_in_chain;
22152 while (per_cu != NULL)
22154 struct dwarf2_per_cu_data *next_cu;
22156 next_cu = per_cu->cu->read_in_chain;
22158 free_heap_comp_unit (per_cu->cu);
22159 *last_chain = next_cu;
22165 /* Increase the age counter on each cached compilation unit, and free
22166 any that are too old. */
22169 age_cached_comp_units (void)
22171 struct dwarf2_per_cu_data *per_cu, **last_chain;
22173 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
22174 per_cu = dwarf2_per_objfile->read_in_chain;
22175 while (per_cu != NULL)
22177 per_cu->cu->last_used ++;
22178 if (per_cu->cu->last_used <= dwarf_max_cache_age)
22179 dwarf2_mark (per_cu->cu);
22180 per_cu = per_cu->cu->read_in_chain;
22183 per_cu = dwarf2_per_objfile->read_in_chain;
22184 last_chain = &dwarf2_per_objfile->read_in_chain;
22185 while (per_cu != NULL)
22187 struct dwarf2_per_cu_data *next_cu;
22189 next_cu = per_cu->cu->read_in_chain;
22191 if (!per_cu->cu->mark)
22193 free_heap_comp_unit (per_cu->cu);
22194 *last_chain = next_cu;
22197 last_chain = &per_cu->cu->read_in_chain;
22203 /* Remove a single compilation unit from the cache. */
22206 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
22208 struct dwarf2_per_cu_data *per_cu, **last_chain;
22210 per_cu = dwarf2_per_objfile->read_in_chain;
22211 last_chain = &dwarf2_per_objfile->read_in_chain;
22212 while (per_cu != NULL)
22214 struct dwarf2_per_cu_data *next_cu;
22216 next_cu = per_cu->cu->read_in_chain;
22218 if (per_cu == target_per_cu)
22220 free_heap_comp_unit (per_cu->cu);
22222 *last_chain = next_cu;
22226 last_chain = &per_cu->cu->read_in_chain;
22232 /* Release all extra memory associated with OBJFILE. */
22235 dwarf2_free_objfile (struct objfile *objfile)
22238 = (struct dwarf2_per_objfile *) objfile_data (objfile,
22239 dwarf2_objfile_data_key);
22241 if (dwarf2_per_objfile == NULL)
22244 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
22245 free_cached_comp_units (NULL);
22247 if (dwarf2_per_objfile->quick_file_names_table)
22248 htab_delete (dwarf2_per_objfile->quick_file_names_table);
22250 if (dwarf2_per_objfile->line_header_hash)
22251 htab_delete (dwarf2_per_objfile->line_header_hash);
22253 /* Everything else should be on the objfile obstack. */
22256 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
22257 We store these in a hash table separate from the DIEs, and preserve them
22258 when the DIEs are flushed out of cache.
22260 The CU "per_cu" pointer is needed because offset alone is not enough to
22261 uniquely identify the type. A file may have multiple .debug_types sections,
22262 or the type may come from a DWO file. Furthermore, while it's more logical
22263 to use per_cu->section+offset, with Fission the section with the data is in
22264 the DWO file but we don't know that section at the point we need it.
22265 We have to use something in dwarf2_per_cu_data (or the pointer to it)
22266 because we can enter the lookup routine, get_die_type_at_offset, from
22267 outside this file, and thus won't necessarily have PER_CU->cu.
22268 Fortunately, PER_CU is stable for the life of the objfile. */
22270 struct dwarf2_per_cu_offset_and_type
22272 const struct dwarf2_per_cu_data *per_cu;
22273 sect_offset offset;
22277 /* Hash function for a dwarf2_per_cu_offset_and_type. */
22280 per_cu_offset_and_type_hash (const void *item)
22282 const struct dwarf2_per_cu_offset_and_type *ofs
22283 = (const struct dwarf2_per_cu_offset_and_type *) item;
22285 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
22288 /* Equality function for a dwarf2_per_cu_offset_and_type. */
22291 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
22293 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
22294 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
22295 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
22296 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
22298 return (ofs_lhs->per_cu == ofs_rhs->per_cu
22299 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
22302 /* Set the type associated with DIE to TYPE. Save it in CU's hash
22303 table if necessary. For convenience, return TYPE.
22305 The DIEs reading must have careful ordering to:
22306 * Not cause infite loops trying to read in DIEs as a prerequisite for
22307 reading current DIE.
22308 * Not trying to dereference contents of still incompletely read in types
22309 while reading in other DIEs.
22310 * Enable referencing still incompletely read in types just by a pointer to
22311 the type without accessing its fields.
22313 Therefore caller should follow these rules:
22314 * Try to fetch any prerequisite types we may need to build this DIE type
22315 before building the type and calling set_die_type.
22316 * After building type call set_die_type for current DIE as soon as
22317 possible before fetching more types to complete the current type.
22318 * Make the type as complete as possible before fetching more types. */
22320 static struct type *
22321 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
22323 struct dwarf2_per_cu_offset_and_type **slot, ofs;
22324 struct objfile *objfile = cu->objfile;
22325 struct attribute *attr;
22326 struct dynamic_prop prop;
22328 /* For Ada types, make sure that the gnat-specific data is always
22329 initialized (if not already set). There are a few types where
22330 we should not be doing so, because the type-specific area is
22331 already used to hold some other piece of info (eg: TYPE_CODE_FLT
22332 where the type-specific area is used to store the floatformat).
22333 But this is not a problem, because the gnat-specific information
22334 is actually not needed for these types. */
22335 if (need_gnat_info (cu)
22336 && TYPE_CODE (type) != TYPE_CODE_FUNC
22337 && TYPE_CODE (type) != TYPE_CODE_FLT
22338 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
22339 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
22340 && TYPE_CODE (type) != TYPE_CODE_METHOD
22341 && !HAVE_GNAT_AUX_INFO (type))
22342 INIT_GNAT_SPECIFIC (type);
22344 /* Read DW_AT_allocated and set in type. */
22345 attr = dwarf2_attr (die, DW_AT_allocated, cu);
22346 if (attr_form_is_block (attr))
22348 if (attr_to_dynamic_prop (attr, die, cu, &prop))
22349 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type, objfile);
22351 else if (attr != NULL)
22353 complaint (&symfile_complaints,
22354 _("DW_AT_allocated has the wrong form (%s) at DIE 0x%x"),
22355 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
22356 die->offset.sect_off);
22359 /* Read DW_AT_associated and set in type. */
22360 attr = dwarf2_attr (die, DW_AT_associated, cu);
22361 if (attr_form_is_block (attr))
22363 if (attr_to_dynamic_prop (attr, die, cu, &prop))
22364 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type, objfile);
22366 else if (attr != NULL)
22368 complaint (&symfile_complaints,
22369 _("DW_AT_associated has the wrong form (%s) at DIE 0x%x"),
22370 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
22371 die->offset.sect_off);
22374 /* Read DW_AT_data_location and set in type. */
22375 attr = dwarf2_attr (die, DW_AT_data_location, cu);
22376 if (attr_to_dynamic_prop (attr, die, cu, &prop))
22377 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type, objfile);
22379 if (dwarf2_per_objfile->die_type_hash == NULL)
22381 dwarf2_per_objfile->die_type_hash =
22382 htab_create_alloc_ex (127,
22383 per_cu_offset_and_type_hash,
22384 per_cu_offset_and_type_eq,
22386 &objfile->objfile_obstack,
22387 hashtab_obstack_allocate,
22388 dummy_obstack_deallocate);
22391 ofs.per_cu = cu->per_cu;
22392 ofs.offset = die->offset;
22394 slot = (struct dwarf2_per_cu_offset_and_type **)
22395 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
22397 complaint (&symfile_complaints,
22398 _("A problem internal to GDB: DIE 0x%x has type already set"),
22399 die->offset.sect_off);
22400 *slot = XOBNEW (&objfile->objfile_obstack,
22401 struct dwarf2_per_cu_offset_and_type);
22406 /* Look up the type for the die at OFFSET in PER_CU in die_type_hash,
22407 or return NULL if the die does not have a saved type. */
22409 static struct type *
22410 get_die_type_at_offset (sect_offset offset,
22411 struct dwarf2_per_cu_data *per_cu)
22413 struct dwarf2_per_cu_offset_and_type *slot, ofs;
22415 if (dwarf2_per_objfile->die_type_hash == NULL)
22418 ofs.per_cu = per_cu;
22419 ofs.offset = offset;
22420 slot = ((struct dwarf2_per_cu_offset_and_type *)
22421 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
22428 /* Look up the type for DIE in CU in die_type_hash,
22429 or return NULL if DIE does not have a saved type. */
22431 static struct type *
22432 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
22434 return get_die_type_at_offset (die->offset, cu->per_cu);
22437 /* Add a dependence relationship from CU to REF_PER_CU. */
22440 dwarf2_add_dependence (struct dwarf2_cu *cu,
22441 struct dwarf2_per_cu_data *ref_per_cu)
22445 if (cu->dependencies == NULL)
22447 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
22448 NULL, &cu->comp_unit_obstack,
22449 hashtab_obstack_allocate,
22450 dummy_obstack_deallocate);
22452 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
22454 *slot = ref_per_cu;
22457 /* Subroutine of dwarf2_mark to pass to htab_traverse.
22458 Set the mark field in every compilation unit in the
22459 cache that we must keep because we are keeping CU. */
22462 dwarf2_mark_helper (void **slot, void *data)
22464 struct dwarf2_per_cu_data *per_cu;
22466 per_cu = (struct dwarf2_per_cu_data *) *slot;
22468 /* cu->dependencies references may not yet have been ever read if QUIT aborts
22469 reading of the chain. As such dependencies remain valid it is not much
22470 useful to track and undo them during QUIT cleanups. */
22471 if (per_cu->cu == NULL)
22474 if (per_cu->cu->mark)
22476 per_cu->cu->mark = 1;
22478 if (per_cu->cu->dependencies != NULL)
22479 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
22484 /* Set the mark field in CU and in every other compilation unit in the
22485 cache that we must keep because we are keeping CU. */
22488 dwarf2_mark (struct dwarf2_cu *cu)
22493 if (cu->dependencies != NULL)
22494 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
22498 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
22502 per_cu->cu->mark = 0;
22503 per_cu = per_cu->cu->read_in_chain;
22507 /* Trivial hash function for partial_die_info: the hash value of a DIE
22508 is its offset in .debug_info for this objfile. */
22511 partial_die_hash (const void *item)
22513 const struct partial_die_info *part_die
22514 = (const struct partial_die_info *) item;
22516 return part_die->offset.sect_off;
22519 /* Trivial comparison function for partial_die_info structures: two DIEs
22520 are equal if they have the same offset. */
22523 partial_die_eq (const void *item_lhs, const void *item_rhs)
22525 const struct partial_die_info *part_die_lhs
22526 = (const struct partial_die_info *) item_lhs;
22527 const struct partial_die_info *part_die_rhs
22528 = (const struct partial_die_info *) item_rhs;
22530 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
22533 static struct cmd_list_element *set_dwarf_cmdlist;
22534 static struct cmd_list_element *show_dwarf_cmdlist;
22537 set_dwarf_cmd (char *args, int from_tty)
22539 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
22544 show_dwarf_cmd (char *args, int from_tty)
22546 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
22549 /* Free data associated with OBJFILE, if necessary. */
22552 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
22554 struct dwarf2_per_objfile *data = (struct dwarf2_per_objfile *) d;
22557 /* Make sure we don't accidentally use dwarf2_per_objfile while
22559 dwarf2_per_objfile = NULL;
22561 for (ix = 0; ix < data->n_comp_units; ++ix)
22562 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
22564 for (ix = 0; ix < data->n_type_units; ++ix)
22565 VEC_free (dwarf2_per_cu_ptr,
22566 data->all_type_units[ix]->per_cu.imported_symtabs);
22567 xfree (data->all_type_units);
22569 VEC_free (dwarf2_section_info_def, data->types);
22571 if (data->dwo_files)
22572 free_dwo_files (data->dwo_files, objfile);
22573 if (data->dwp_file)
22574 gdb_bfd_unref (data->dwp_file->dbfd);
22576 if (data->dwz_file && data->dwz_file->dwz_bfd)
22577 gdb_bfd_unref (data->dwz_file->dwz_bfd);
22581 /* The "save gdb-index" command. */
22583 /* The contents of the hash table we create when building the string
22585 struct strtab_entry
22587 offset_type offset;
22591 /* Hash function for a strtab_entry.
22593 Function is used only during write_hash_table so no index format backward
22594 compatibility is needed. */
22597 hash_strtab_entry (const void *e)
22599 const struct strtab_entry *entry = (const struct strtab_entry *) e;
22600 return mapped_index_string_hash (INT_MAX, entry->str);
22603 /* Equality function for a strtab_entry. */
22606 eq_strtab_entry (const void *a, const void *b)
22608 const struct strtab_entry *ea = (const struct strtab_entry *) a;
22609 const struct strtab_entry *eb = (const struct strtab_entry *) b;
22610 return !strcmp (ea->str, eb->str);
22613 /* Create a strtab_entry hash table. */
22616 create_strtab (void)
22618 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry,
22619 xfree, xcalloc, xfree);
22622 /* Add a string to the constant pool. Return the string's offset in
22626 add_string (htab_t table, struct obstack *cpool, const char *str)
22629 struct strtab_entry entry;
22630 struct strtab_entry *result;
22633 slot = htab_find_slot (table, &entry, INSERT);
22635 result = (struct strtab_entry *) *slot;
22638 result = XNEW (struct strtab_entry);
22639 result->offset = obstack_object_size (cpool);
22641 obstack_grow_str0 (cpool, str);
22644 return result->offset;
22647 /* An entry in the symbol table. */
22648 struct symtab_index_entry
22650 /* The name of the symbol. */
22652 /* The offset of the name in the constant pool. */
22653 offset_type index_offset;
22654 /* A sorted vector of the indices of all the CUs that hold an object
22656 VEC (offset_type) *cu_indices;
22659 /* The symbol table. This is a power-of-2-sized hash table. */
22660 struct mapped_symtab
22662 offset_type n_elements;
22664 struct symtab_index_entry **data;
22667 /* Hash function for a symtab_index_entry. */
22670 hash_symtab_entry (const void *e)
22672 const struct symtab_index_entry *entry
22673 = (const struct symtab_index_entry *) e;
22674 return iterative_hash (VEC_address (offset_type, entry->cu_indices),
22675 sizeof (offset_type) * VEC_length (offset_type,
22676 entry->cu_indices),
22680 /* Equality function for a symtab_index_entry. */
22683 eq_symtab_entry (const void *a, const void *b)
22685 const struct symtab_index_entry *ea = (const struct symtab_index_entry *) a;
22686 const struct symtab_index_entry *eb = (const struct symtab_index_entry *) b;
22687 int len = VEC_length (offset_type, ea->cu_indices);
22688 if (len != VEC_length (offset_type, eb->cu_indices))
22690 return !memcmp (VEC_address (offset_type, ea->cu_indices),
22691 VEC_address (offset_type, eb->cu_indices),
22692 sizeof (offset_type) * len);
22695 /* Destroy a symtab_index_entry. */
22698 delete_symtab_entry (void *p)
22700 struct symtab_index_entry *entry = (struct symtab_index_entry *) p;
22701 VEC_free (offset_type, entry->cu_indices);
22705 /* Create a hash table holding symtab_index_entry objects. */
22708 create_symbol_hash_table (void)
22710 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry,
22711 delete_symtab_entry, xcalloc, xfree);
22714 /* Create a new mapped symtab object. */
22716 static struct mapped_symtab *
22717 create_mapped_symtab (void)
22719 struct mapped_symtab *symtab = XNEW (struct mapped_symtab);
22720 symtab->n_elements = 0;
22721 symtab->size = 1024;
22722 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
22726 /* Destroy a mapped_symtab. */
22729 cleanup_mapped_symtab (void *p)
22731 struct mapped_symtab *symtab = (struct mapped_symtab *) p;
22732 /* The contents of the array are freed when the other hash table is
22734 xfree (symtab->data);
22738 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to
22741 Function is used only during write_hash_table so no index format backward
22742 compatibility is needed. */
22744 static struct symtab_index_entry **
22745 find_slot (struct mapped_symtab *symtab, const char *name)
22747 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
22749 index = hash & (symtab->size - 1);
22750 step = ((hash * 17) & (symtab->size - 1)) | 1;
22754 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name))
22755 return &symtab->data[index];
22756 index = (index + step) & (symtab->size - 1);
22760 /* Expand SYMTAB's hash table. */
22763 hash_expand (struct mapped_symtab *symtab)
22765 offset_type old_size = symtab->size;
22767 struct symtab_index_entry **old_entries = symtab->data;
22770 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
22772 for (i = 0; i < old_size; ++i)
22774 if (old_entries[i])
22776 struct symtab_index_entry **slot = find_slot (symtab,
22777 old_entries[i]->name);
22778 *slot = old_entries[i];
22782 xfree (old_entries);
22785 /* Add an entry to SYMTAB. NAME is the name of the symbol.
22786 CU_INDEX is the index of the CU in which the symbol appears.
22787 IS_STATIC is one if the symbol is static, otherwise zero (global). */
22790 add_index_entry (struct mapped_symtab *symtab, const char *name,
22791 int is_static, gdb_index_symbol_kind kind,
22792 offset_type cu_index)
22794 struct symtab_index_entry **slot;
22795 offset_type cu_index_and_attrs;
22797 ++symtab->n_elements;
22798 if (4 * symtab->n_elements / 3 >= symtab->size)
22799 hash_expand (symtab);
22801 slot = find_slot (symtab, name);
22804 *slot = XNEW (struct symtab_index_entry);
22805 (*slot)->name = name;
22806 /* index_offset is set later. */
22807 (*slot)->cu_indices = NULL;
22810 cu_index_and_attrs = 0;
22811 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
22812 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
22813 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
22815 /* We don't want to record an index value twice as we want to avoid the
22817 We process all global symbols and then all static symbols
22818 (which would allow us to avoid the duplication by only having to check
22819 the last entry pushed), but a symbol could have multiple kinds in one CU.
22820 To keep things simple we don't worry about the duplication here and
22821 sort and uniqufy the list after we've processed all symbols. */
22822 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs);
22825 /* qsort helper routine for uniquify_cu_indices. */
22828 offset_type_compare (const void *ap, const void *bp)
22830 offset_type a = *(offset_type *) ap;
22831 offset_type b = *(offset_type *) bp;
22833 return (a > b) - (b > a);
22836 /* Sort and remove duplicates of all symbols' cu_indices lists. */
22839 uniquify_cu_indices (struct mapped_symtab *symtab)
22843 for (i = 0; i < symtab->size; ++i)
22845 struct symtab_index_entry *entry = symtab->data[i];
22848 && entry->cu_indices != NULL)
22850 unsigned int next_to_insert, next_to_check;
22851 offset_type last_value;
22853 qsort (VEC_address (offset_type, entry->cu_indices),
22854 VEC_length (offset_type, entry->cu_indices),
22855 sizeof (offset_type), offset_type_compare);
22857 last_value = VEC_index (offset_type, entry->cu_indices, 0);
22858 next_to_insert = 1;
22859 for (next_to_check = 1;
22860 next_to_check < VEC_length (offset_type, entry->cu_indices);
22863 if (VEC_index (offset_type, entry->cu_indices, next_to_check)
22866 last_value = VEC_index (offset_type, entry->cu_indices,
22868 VEC_replace (offset_type, entry->cu_indices, next_to_insert,
22873 VEC_truncate (offset_type, entry->cu_indices, next_to_insert);
22878 /* Add a vector of indices to the constant pool. */
22881 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool,
22882 struct symtab_index_entry *entry)
22886 slot = htab_find_slot (symbol_hash_table, entry, INSERT);
22889 offset_type len = VEC_length (offset_type, entry->cu_indices);
22890 offset_type val = MAYBE_SWAP (len);
22895 entry->index_offset = obstack_object_size (cpool);
22897 obstack_grow (cpool, &val, sizeof (val));
22899 VEC_iterate (offset_type, entry->cu_indices, i, iter);
22902 val = MAYBE_SWAP (iter);
22903 obstack_grow (cpool, &val, sizeof (val));
22908 struct symtab_index_entry *old_entry
22909 = (struct symtab_index_entry *) *slot;
22910 entry->index_offset = old_entry->index_offset;
22913 return entry->index_offset;
22916 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with
22917 constant pool entries going into the obstack CPOOL. */
22920 write_hash_table (struct mapped_symtab *symtab,
22921 struct obstack *output, struct obstack *cpool)
22924 htab_t symbol_hash_table;
22927 symbol_hash_table = create_symbol_hash_table ();
22928 str_table = create_strtab ();
22930 /* We add all the index vectors to the constant pool first, to
22931 ensure alignment is ok. */
22932 for (i = 0; i < symtab->size; ++i)
22934 if (symtab->data[i])
22935 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]);
22938 /* Now write out the hash table. */
22939 for (i = 0; i < symtab->size; ++i)
22941 offset_type str_off, vec_off;
22943 if (symtab->data[i])
22945 str_off = add_string (str_table, cpool, symtab->data[i]->name);
22946 vec_off = symtab->data[i]->index_offset;
22950 /* While 0 is a valid constant pool index, it is not valid
22951 to have 0 for both offsets. */
22956 str_off = MAYBE_SWAP (str_off);
22957 vec_off = MAYBE_SWAP (vec_off);
22959 obstack_grow (output, &str_off, sizeof (str_off));
22960 obstack_grow (output, &vec_off, sizeof (vec_off));
22963 htab_delete (str_table);
22964 htab_delete (symbol_hash_table);
22967 /* Struct to map psymtab to CU index in the index file. */
22968 struct psymtab_cu_index_map
22970 struct partial_symtab *psymtab;
22971 unsigned int cu_index;
22975 hash_psymtab_cu_index (const void *item)
22977 const struct psymtab_cu_index_map *map
22978 = (const struct psymtab_cu_index_map *) item;
22980 return htab_hash_pointer (map->psymtab);
22984 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs)
22986 const struct psymtab_cu_index_map *lhs
22987 = (const struct psymtab_cu_index_map *) item_lhs;
22988 const struct psymtab_cu_index_map *rhs
22989 = (const struct psymtab_cu_index_map *) item_rhs;
22991 return lhs->psymtab == rhs->psymtab;
22994 /* Helper struct for building the address table. */
22995 struct addrmap_index_data
22997 struct objfile *objfile;
22998 struct obstack *addr_obstack;
22999 htab_t cu_index_htab;
23001 /* Non-zero if the previous_* fields are valid.
23002 We can't write an entry until we see the next entry (since it is only then
23003 that we know the end of the entry). */
23004 int previous_valid;
23005 /* Index of the CU in the table of all CUs in the index file. */
23006 unsigned int previous_cu_index;
23007 /* Start address of the CU. */
23008 CORE_ADDR previous_cu_start;
23011 /* Write an address entry to OBSTACK. */
23014 add_address_entry (struct objfile *objfile, struct obstack *obstack,
23015 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
23017 offset_type cu_index_to_write;
23019 CORE_ADDR baseaddr;
23021 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
23023 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr);
23024 obstack_grow (obstack, addr, 8);
23025 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr);
23026 obstack_grow (obstack, addr, 8);
23027 cu_index_to_write = MAYBE_SWAP (cu_index);
23028 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type));
23031 /* Worker function for traversing an addrmap to build the address table. */
23034 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
23036 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
23037 struct partial_symtab *pst = (struct partial_symtab *) obj;
23039 if (data->previous_valid)
23040 add_address_entry (data->objfile, data->addr_obstack,
23041 data->previous_cu_start, start_addr,
23042 data->previous_cu_index);
23044 data->previous_cu_start = start_addr;
23047 struct psymtab_cu_index_map find_map, *map;
23048 find_map.psymtab = pst;
23049 map = ((struct psymtab_cu_index_map *)
23050 htab_find (data->cu_index_htab, &find_map));
23051 gdb_assert (map != NULL);
23052 data->previous_cu_index = map->cu_index;
23053 data->previous_valid = 1;
23056 data->previous_valid = 0;
23061 /* Write OBJFILE's address map to OBSTACK.
23062 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
23063 in the index file. */
23066 write_address_map (struct objfile *objfile, struct obstack *obstack,
23067 htab_t cu_index_htab)
23069 struct addrmap_index_data addrmap_index_data;
23071 /* When writing the address table, we have to cope with the fact that
23072 the addrmap iterator only provides the start of a region; we have to
23073 wait until the next invocation to get the start of the next region. */
23075 addrmap_index_data.objfile = objfile;
23076 addrmap_index_data.addr_obstack = obstack;
23077 addrmap_index_data.cu_index_htab = cu_index_htab;
23078 addrmap_index_data.previous_valid = 0;
23080 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
23081 &addrmap_index_data);
23083 /* It's highly unlikely the last entry (end address = 0xff...ff)
23084 is valid, but we should still handle it.
23085 The end address is recorded as the start of the next region, but that
23086 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
23088 if (addrmap_index_data.previous_valid)
23089 add_address_entry (objfile, obstack,
23090 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
23091 addrmap_index_data.previous_cu_index);
23094 /* Return the symbol kind of PSYM. */
23096 static gdb_index_symbol_kind
23097 symbol_kind (struct partial_symbol *psym)
23099 domain_enum domain = PSYMBOL_DOMAIN (psym);
23100 enum address_class aclass = PSYMBOL_CLASS (psym);
23108 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
23110 return GDB_INDEX_SYMBOL_KIND_TYPE;
23112 case LOC_CONST_BYTES:
23113 case LOC_OPTIMIZED_OUT:
23115 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23117 /* Note: It's currently impossible to recognize psyms as enum values
23118 short of reading the type info. For now punt. */
23119 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23121 /* There are other LOC_FOO values that one might want to classify
23122 as variables, but dwarf2read.c doesn't currently use them. */
23123 return GDB_INDEX_SYMBOL_KIND_OTHER;
23125 case STRUCT_DOMAIN:
23126 return GDB_INDEX_SYMBOL_KIND_TYPE;
23128 return GDB_INDEX_SYMBOL_KIND_OTHER;
23132 /* Add a list of partial symbols to SYMTAB. */
23135 write_psymbols (struct mapped_symtab *symtab,
23137 struct partial_symbol **psymp,
23139 offset_type cu_index,
23142 for (; count-- > 0; ++psymp)
23144 struct partial_symbol *psym = *psymp;
23147 if (SYMBOL_LANGUAGE (psym) == language_ada)
23148 error (_("Ada is not currently supported by the index"));
23150 /* Only add a given psymbol once. */
23151 slot = htab_find_slot (psyms_seen, psym, INSERT);
23154 gdb_index_symbol_kind kind = symbol_kind (psym);
23157 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
23158 is_static, kind, cu_index);
23163 /* Write the contents of an ("unfinished") obstack to FILE. Throw an
23164 exception if there is an error. */
23167 write_obstack (FILE *file, struct obstack *obstack)
23169 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack),
23171 != obstack_object_size (obstack))
23172 error (_("couldn't data write to file"));
23175 /* Unlink a file if the argument is not NULL. */
23178 unlink_if_set (void *p)
23180 char **filename = (char **) p;
23182 unlink (*filename);
23185 /* A helper struct used when iterating over debug_types. */
23186 struct signatured_type_index_data
23188 struct objfile *objfile;
23189 struct mapped_symtab *symtab;
23190 struct obstack *types_list;
23195 /* A helper function that writes a single signatured_type to an
23199 write_one_signatured_type (void **slot, void *d)
23201 struct signatured_type_index_data *info
23202 = (struct signatured_type_index_data *) d;
23203 struct signatured_type *entry = (struct signatured_type *) *slot;
23204 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
23207 write_psymbols (info->symtab,
23209 info->objfile->global_psymbols.list
23210 + psymtab->globals_offset,
23211 psymtab->n_global_syms, info->cu_index,
23213 write_psymbols (info->symtab,
23215 info->objfile->static_psymbols.list
23216 + psymtab->statics_offset,
23217 psymtab->n_static_syms, info->cu_index,
23220 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
23221 entry->per_cu.offset.sect_off);
23222 obstack_grow (info->types_list, val, 8);
23223 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
23224 entry->type_offset_in_tu.cu_off);
23225 obstack_grow (info->types_list, val, 8);
23226 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature);
23227 obstack_grow (info->types_list, val, 8);
23234 /* Recurse into all "included" dependencies and write their symbols as
23235 if they appeared in this psymtab. */
23238 recursively_write_psymbols (struct objfile *objfile,
23239 struct partial_symtab *psymtab,
23240 struct mapped_symtab *symtab,
23242 offset_type cu_index)
23246 for (i = 0; i < psymtab->number_of_dependencies; ++i)
23247 if (psymtab->dependencies[i]->user != NULL)
23248 recursively_write_psymbols (objfile, psymtab->dependencies[i],
23249 symtab, psyms_seen, cu_index);
23251 write_psymbols (symtab,
23253 objfile->global_psymbols.list + psymtab->globals_offset,
23254 psymtab->n_global_syms, cu_index,
23256 write_psymbols (symtab,
23258 objfile->static_psymbols.list + psymtab->statics_offset,
23259 psymtab->n_static_syms, cu_index,
23263 /* Create an index file for OBJFILE in the directory DIR. */
23266 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
23268 struct cleanup *cleanup;
23269 char *filename, *cleanup_filename;
23270 struct obstack contents, addr_obstack, constant_pool, symtab_obstack;
23271 struct obstack cu_list, types_cu_list;
23274 struct mapped_symtab *symtab;
23275 offset_type val, size_of_contents, total_len;
23278 htab_t cu_index_htab;
23279 struct psymtab_cu_index_map *psymtab_cu_index_map;
23281 if (dwarf2_per_objfile->using_index)
23282 error (_("Cannot use an index to create the index"));
23284 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
23285 error (_("Cannot make an index when the file has multiple .debug_types sections"));
23287 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
23290 if (stat (objfile_name (objfile), &st) < 0)
23291 perror_with_name (objfile_name (objfile));
23293 filename = concat (dir, SLASH_STRING, lbasename (objfile_name (objfile)),
23294 INDEX_SUFFIX, (char *) NULL);
23295 cleanup = make_cleanup (xfree, filename);
23297 out_file = gdb_fopen_cloexec (filename, "wb");
23299 error (_("Can't open `%s' for writing"), filename);
23301 cleanup_filename = filename;
23302 make_cleanup (unlink_if_set, &cleanup_filename);
23304 symtab = create_mapped_symtab ();
23305 make_cleanup (cleanup_mapped_symtab, symtab);
23307 obstack_init (&addr_obstack);
23308 make_cleanup_obstack_free (&addr_obstack);
23310 obstack_init (&cu_list);
23311 make_cleanup_obstack_free (&cu_list);
23313 obstack_init (&types_cu_list);
23314 make_cleanup_obstack_free (&types_cu_list);
23316 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer,
23317 NULL, xcalloc, xfree);
23318 make_cleanup_htab_delete (psyms_seen);
23320 /* While we're scanning CU's create a table that maps a psymtab pointer
23321 (which is what addrmap records) to its index (which is what is recorded
23322 in the index file). This will later be needed to write the address
23324 cu_index_htab = htab_create_alloc (100,
23325 hash_psymtab_cu_index,
23326 eq_psymtab_cu_index,
23327 NULL, xcalloc, xfree);
23328 make_cleanup_htab_delete (cu_index_htab);
23329 psymtab_cu_index_map = XNEWVEC (struct psymtab_cu_index_map,
23330 dwarf2_per_objfile->n_comp_units);
23331 make_cleanup (xfree, psymtab_cu_index_map);
23333 /* The CU list is already sorted, so we don't need to do additional
23334 work here. Also, the debug_types entries do not appear in
23335 all_comp_units, but only in their own hash table. */
23336 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
23338 struct dwarf2_per_cu_data *per_cu
23339 = dwarf2_per_objfile->all_comp_units[i];
23340 struct partial_symtab *psymtab = per_cu->v.psymtab;
23342 struct psymtab_cu_index_map *map;
23345 /* CU of a shared file from 'dwz -m' may be unused by this main file.
23346 It may be referenced from a local scope but in such case it does not
23347 need to be present in .gdb_index. */
23348 if (psymtab == NULL)
23351 if (psymtab->user == NULL)
23352 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i);
23354 map = &psymtab_cu_index_map[i];
23355 map->psymtab = psymtab;
23357 slot = htab_find_slot (cu_index_htab, map, INSERT);
23358 gdb_assert (slot != NULL);
23359 gdb_assert (*slot == NULL);
23362 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
23363 per_cu->offset.sect_off);
23364 obstack_grow (&cu_list, val, 8);
23365 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length);
23366 obstack_grow (&cu_list, val, 8);
23369 /* Dump the address map. */
23370 write_address_map (objfile, &addr_obstack, cu_index_htab);
23372 /* Write out the .debug_type entries, if any. */
23373 if (dwarf2_per_objfile->signatured_types)
23375 struct signatured_type_index_data sig_data;
23377 sig_data.objfile = objfile;
23378 sig_data.symtab = symtab;
23379 sig_data.types_list = &types_cu_list;
23380 sig_data.psyms_seen = psyms_seen;
23381 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
23382 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
23383 write_one_signatured_type, &sig_data);
23386 /* Now that we've processed all symbols we can shrink their cu_indices
23388 uniquify_cu_indices (symtab);
23390 obstack_init (&constant_pool);
23391 make_cleanup_obstack_free (&constant_pool);
23392 obstack_init (&symtab_obstack);
23393 make_cleanup_obstack_free (&symtab_obstack);
23394 write_hash_table (symtab, &symtab_obstack, &constant_pool);
23396 obstack_init (&contents);
23397 make_cleanup_obstack_free (&contents);
23398 size_of_contents = 6 * sizeof (offset_type);
23399 total_len = size_of_contents;
23401 /* The version number. */
23402 val = MAYBE_SWAP (8);
23403 obstack_grow (&contents, &val, sizeof (val));
23405 /* The offset of the CU list from the start of the file. */
23406 val = MAYBE_SWAP (total_len);
23407 obstack_grow (&contents, &val, sizeof (val));
23408 total_len += obstack_object_size (&cu_list);
23410 /* The offset of the types CU list from the start of the file. */
23411 val = MAYBE_SWAP (total_len);
23412 obstack_grow (&contents, &val, sizeof (val));
23413 total_len += obstack_object_size (&types_cu_list);
23415 /* The offset of the address table from the start of the file. */
23416 val = MAYBE_SWAP (total_len);
23417 obstack_grow (&contents, &val, sizeof (val));
23418 total_len += obstack_object_size (&addr_obstack);
23420 /* The offset of the symbol table from the start of the file. */
23421 val = MAYBE_SWAP (total_len);
23422 obstack_grow (&contents, &val, sizeof (val));
23423 total_len += obstack_object_size (&symtab_obstack);
23425 /* The offset of the constant pool from the start of the file. */
23426 val = MAYBE_SWAP (total_len);
23427 obstack_grow (&contents, &val, sizeof (val));
23428 total_len += obstack_object_size (&constant_pool);
23430 gdb_assert (obstack_object_size (&contents) == size_of_contents);
23432 write_obstack (out_file, &contents);
23433 write_obstack (out_file, &cu_list);
23434 write_obstack (out_file, &types_cu_list);
23435 write_obstack (out_file, &addr_obstack);
23436 write_obstack (out_file, &symtab_obstack);
23437 write_obstack (out_file, &constant_pool);
23441 /* We want to keep the file, so we set cleanup_filename to NULL
23442 here. See unlink_if_set. */
23443 cleanup_filename = NULL;
23445 do_cleanups (cleanup);
23448 /* Implementation of the `save gdb-index' command.
23450 Note that the file format used by this command is documented in the
23451 GDB manual. Any changes here must be documented there. */
23454 save_gdb_index_command (char *arg, int from_tty)
23456 struct objfile *objfile;
23459 error (_("usage: save gdb-index DIRECTORY"));
23461 ALL_OBJFILES (objfile)
23465 /* If the objfile does not correspond to an actual file, skip it. */
23466 if (stat (objfile_name (objfile), &st) < 0)
23470 = (struct dwarf2_per_objfile *) objfile_data (objfile,
23471 dwarf2_objfile_data_key);
23472 if (dwarf2_per_objfile)
23477 write_psymtabs_to_index (objfile, arg);
23479 CATCH (except, RETURN_MASK_ERROR)
23481 exception_fprintf (gdb_stderr, except,
23482 _("Error while writing index for `%s': "),
23483 objfile_name (objfile));
23492 int dwarf_always_disassemble;
23495 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
23496 struct cmd_list_element *c, const char *value)
23498 fprintf_filtered (file,
23499 _("Whether to always disassemble "
23500 "DWARF expressions is %s.\n"),
23505 show_check_physname (struct ui_file *file, int from_tty,
23506 struct cmd_list_element *c, const char *value)
23508 fprintf_filtered (file,
23509 _("Whether to check \"physname\" is %s.\n"),
23513 void _initialize_dwarf2_read (void);
23516 _initialize_dwarf2_read (void)
23518 struct cmd_list_element *c;
23520 dwarf2_objfile_data_key
23521 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
23523 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
23524 Set DWARF specific variables.\n\
23525 Configure DWARF variables such as the cache size"),
23526 &set_dwarf_cmdlist, "maintenance set dwarf ",
23527 0/*allow-unknown*/, &maintenance_set_cmdlist);
23529 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
23530 Show DWARF specific variables\n\
23531 Show DWARF variables such as the cache size"),
23532 &show_dwarf_cmdlist, "maintenance show dwarf ",
23533 0/*allow-unknown*/, &maintenance_show_cmdlist);
23535 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
23536 &dwarf_max_cache_age, _("\
23537 Set the upper bound on the age of cached DWARF compilation units."), _("\
23538 Show the upper bound on the age of cached DWARF compilation units."), _("\
23539 A higher limit means that cached compilation units will be stored\n\
23540 in memory longer, and more total memory will be used. Zero disables\n\
23541 caching, which can slow down startup."),
23543 show_dwarf_max_cache_age,
23544 &set_dwarf_cmdlist,
23545 &show_dwarf_cmdlist);
23547 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
23548 &dwarf_always_disassemble, _("\
23549 Set whether `info address' always disassembles DWARF expressions."), _("\
23550 Show whether `info address' always disassembles DWARF expressions."), _("\
23551 When enabled, DWARF expressions are always printed in an assembly-like\n\
23552 syntax. When disabled, expressions will be printed in a more\n\
23553 conversational style, when possible."),
23555 show_dwarf_always_disassemble,
23556 &set_dwarf_cmdlist,
23557 &show_dwarf_cmdlist);
23559 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
23560 Set debugging of the DWARF reader."), _("\
23561 Show debugging of the DWARF reader."), _("\
23562 When enabled (non-zero), debugging messages are printed during DWARF\n\
23563 reading and symtab expansion. A value of 1 (one) provides basic\n\
23564 information. A value greater than 1 provides more verbose information."),
23567 &setdebuglist, &showdebuglist);
23569 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
23570 Set debugging of the DWARF DIE reader."), _("\
23571 Show debugging of the DWARF DIE reader."), _("\
23572 When enabled (non-zero), DIEs are dumped after they are read in.\n\
23573 The value is the maximum depth to print."),
23576 &setdebuglist, &showdebuglist);
23578 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
23579 Set debugging of the dwarf line reader."), _("\
23580 Show debugging of the dwarf line reader."), _("\
23581 When enabled (non-zero), line number entries are dumped as they are read in.\n\
23582 A value of 1 (one) provides basic information.\n\
23583 A value greater than 1 provides more verbose information."),
23586 &setdebuglist, &showdebuglist);
23588 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
23589 Set cross-checking of \"physname\" code against demangler."), _("\
23590 Show cross-checking of \"physname\" code against demangler."), _("\
23591 When enabled, GDB's internal \"physname\" code is checked against\n\
23593 NULL, show_check_physname,
23594 &setdebuglist, &showdebuglist);
23596 add_setshow_boolean_cmd ("use-deprecated-index-sections",
23597 no_class, &use_deprecated_index_sections, _("\
23598 Set whether to use deprecated gdb_index sections."), _("\
23599 Show whether to use deprecated gdb_index sections."), _("\
23600 When enabled, deprecated .gdb_index sections are used anyway.\n\
23601 Normally they are ignored either because of a missing feature or\n\
23602 performance issue.\n\
23603 Warning: This option must be enabled before gdb reads the file."),
23606 &setlist, &showlist);
23608 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
23610 Save a gdb-index file.\n\
23611 Usage: save gdb-index DIRECTORY"),
23613 set_cmd_completer (c, filename_completer);
23615 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
23616 &dwarf2_locexpr_funcs);
23617 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
23618 &dwarf2_loclist_funcs);
23620 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
23621 &dwarf2_block_frame_base_locexpr_funcs);
23622 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
23623 &dwarf2_block_frame_base_loclist_funcs);