1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2017 Free Software Foundation, Inc.
5 Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
6 Inc. with support from Florida State University (under contract
7 with the Ada Joint Program Office), and Silicon Graphics, Inc.
8 Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
9 based on Fred Fish's (Cygnus Support) implementation of DWARF 1
12 This file is part of GDB.
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 3 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 /* FIXME: Various die-reading functions need to be more careful with
28 reading off the end of the section.
29 E.g., load_partial_dies, read_partial_die. */
40 #include "gdb-demangle.h"
41 #include "expression.h"
42 #include "filenames.h" /* for DOSish file names */
45 #include "complaints.h"
47 #include "dwarf2expr.h"
48 #include "dwarf2loc.h"
49 #include "cp-support.h"
55 #include "typeprint.h"
58 #include "completer.h"
63 #include "gdbcore.h" /* for gnutarget */
64 #include "gdb/gdb-index.h"
69 #include "filestuff.h"
71 #include "namespace.h"
72 #include "common/gdb_unlinker.h"
73 #include "common/function-view.h"
74 #include "common/gdb_optional.h"
75 #include "common/underlying.h"
76 #include "common/byte-vector.h"
77 #include "filename-seen-cache.h"
79 #include <sys/types.h>
81 #include <unordered_set>
82 #include <unordered_map>
84 typedef struct symbol *symbolp;
87 /* When == 1, print basic high level tracing messages.
88 When > 1, be more verbose.
89 This is in contrast to the low level DIE reading of dwarf_die_debug. */
90 static unsigned int dwarf_read_debug = 0;
92 /* When non-zero, dump DIEs after they are read in. */
93 static unsigned int dwarf_die_debug = 0;
95 /* When non-zero, dump line number entries as they are read in. */
96 static unsigned int dwarf_line_debug = 0;
98 /* When non-zero, cross-check physname against demangler. */
99 static int check_physname = 0;
101 /* When non-zero, do not reject deprecated .gdb_index sections. */
102 static int use_deprecated_index_sections = 0;
104 static const struct objfile_data *dwarf2_objfile_data_key;
106 /* The "aclass" indices for various kinds of computed DWARF symbols. */
108 static int dwarf2_locexpr_index;
109 static int dwarf2_loclist_index;
110 static int dwarf2_locexpr_block_index;
111 static int dwarf2_loclist_block_index;
113 /* A descriptor for dwarf sections.
115 S.ASECTION, SIZE are typically initialized when the objfile is first
116 scanned. BUFFER, READIN are filled in later when the section is read.
117 If the section contained compressed data then SIZE is updated to record
118 the uncompressed size of the section.
120 DWP file format V2 introduces a wrinkle that is easiest to handle by
121 creating the concept of virtual sections contained within a real section.
122 In DWP V2 the sections of the input DWO files are concatenated together
123 into one section, but section offsets are kept relative to the original
125 If this is a virtual dwp-v2 section, S.CONTAINING_SECTION is a backlink to
126 the real section this "virtual" section is contained in, and BUFFER,SIZE
127 describe the virtual section. */
129 struct dwarf2_section_info
133 /* If this is a real section, the bfd section. */
135 /* If this is a virtual section, pointer to the containing ("real")
137 struct dwarf2_section_info *containing_section;
139 /* Pointer to section data, only valid if readin. */
140 const gdb_byte *buffer;
141 /* The size of the section, real or virtual. */
143 /* If this is a virtual section, the offset in the real section.
144 Only valid if is_virtual. */
145 bfd_size_type virtual_offset;
146 /* True if we have tried to read this section. */
148 /* True if this is a virtual section, False otherwise.
149 This specifies which of s.section and s.containing_section to use. */
153 typedef struct dwarf2_section_info dwarf2_section_info_def;
154 DEF_VEC_O (dwarf2_section_info_def);
156 /* All offsets in the index are of this type. It must be
157 architecture-independent. */
158 typedef uint32_t offset_type;
160 DEF_VEC_I (offset_type);
162 /* Ensure only legit values are used. */
163 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
165 gdb_assert ((unsigned int) (value) <= 1); \
166 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
169 /* Ensure only legit values are used. */
170 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
172 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
173 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
174 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
177 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
178 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
180 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
181 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
184 /* A description of the mapped index. The file format is described in
185 a comment by the code that writes the index. */
188 /* Index data format version. */
191 /* The total length of the buffer. */
194 /* A pointer to the address table data. */
195 const gdb_byte *address_table;
197 /* Size of the address table data in bytes. */
198 offset_type address_table_size;
200 /* The symbol table, implemented as a hash table. */
201 const offset_type *symbol_table;
203 /* Size in slots, each slot is 2 offset_types. */
204 offset_type symbol_table_slots;
206 /* A pointer to the constant pool. */
207 const char *constant_pool;
210 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
211 DEF_VEC_P (dwarf2_per_cu_ptr);
215 int nr_uniq_abbrev_tables;
217 int nr_symtab_sharers;
218 int nr_stmt_less_type_units;
219 int nr_all_type_units_reallocs;
222 /* Collection of data recorded per objfile.
223 This hangs off of dwarf2_objfile_data_key. */
225 struct dwarf2_per_objfile
227 /* Construct a dwarf2_per_objfile for OBJFILE. NAMES points to the
228 dwarf2 section names, or is NULL if the standard ELF names are
230 dwarf2_per_objfile (struct objfile *objfile,
231 const dwarf2_debug_sections *names);
233 ~dwarf2_per_objfile ();
236 dwarf2_per_objfile (const dwarf2_per_objfile &) = delete;
237 void operator= (const dwarf2_per_objfile &) = delete;
239 /* Free all cached compilation units. */
240 void free_cached_comp_units ();
242 /* This function is mapped across the sections and remembers the
243 offset and size of each of the debugging sections we are
245 void locate_sections (bfd *abfd, asection *sectp,
246 const dwarf2_debug_sections &names);
249 dwarf2_section_info info {};
250 dwarf2_section_info abbrev {};
251 dwarf2_section_info line {};
252 dwarf2_section_info loc {};
253 dwarf2_section_info loclists {};
254 dwarf2_section_info macinfo {};
255 dwarf2_section_info macro {};
256 dwarf2_section_info str {};
257 dwarf2_section_info line_str {};
258 dwarf2_section_info ranges {};
259 dwarf2_section_info rnglists {};
260 dwarf2_section_info addr {};
261 dwarf2_section_info frame {};
262 dwarf2_section_info eh_frame {};
263 dwarf2_section_info gdb_index {};
265 VEC (dwarf2_section_info_def) *types = NULL;
268 struct objfile *objfile = NULL;
270 /* Table of all the compilation units. This is used to locate
271 the target compilation unit of a particular reference. */
272 struct dwarf2_per_cu_data **all_comp_units = NULL;
274 /* The number of compilation units in ALL_COMP_UNITS. */
275 int n_comp_units = 0;
277 /* The number of .debug_types-related CUs. */
278 int n_type_units = 0;
280 /* The number of elements allocated in all_type_units.
281 If there are skeleton-less TUs, we add them to all_type_units lazily. */
282 int n_allocated_type_units = 0;
284 /* The .debug_types-related CUs (TUs).
285 This is stored in malloc space because we may realloc it. */
286 struct signatured_type **all_type_units = NULL;
288 /* Table of struct type_unit_group objects.
289 The hash key is the DW_AT_stmt_list value. */
290 htab_t type_unit_groups {};
292 /* A table mapping .debug_types signatures to its signatured_type entry.
293 This is NULL if the .debug_types section hasn't been read in yet. */
294 htab_t signatured_types {};
296 /* Type unit statistics, to see how well the scaling improvements
298 struct tu_stats tu_stats {};
300 /* A chain of compilation units that are currently read in, so that
301 they can be freed later. */
302 dwarf2_per_cu_data *read_in_chain = NULL;
304 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
305 This is NULL if the table hasn't been allocated yet. */
308 /* True if we've checked for whether there is a DWP file. */
309 bool dwp_checked = false;
311 /* The DWP file if there is one, or NULL. */
312 struct dwp_file *dwp_file = NULL;
314 /* The shared '.dwz' file, if one exists. This is used when the
315 original data was compressed using 'dwz -m'. */
316 struct dwz_file *dwz_file = NULL;
318 /* A flag indicating whether this objfile has a section loaded at a
320 bool has_section_at_zero = false;
322 /* True if we are using the mapped index,
323 or we are faking it for OBJF_READNOW's sake. */
324 bool using_index = false;
326 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
327 mapped_index *index_table = NULL;
329 /* When using index_table, this keeps track of all quick_file_names entries.
330 TUs typically share line table entries with a CU, so we maintain a
331 separate table of all line table entries to support the sharing.
332 Note that while there can be way more TUs than CUs, we've already
333 sorted all the TUs into "type unit groups", grouped by their
334 DW_AT_stmt_list value. Therefore the only sharing done here is with a
335 CU and its associated TU group if there is one. */
336 htab_t quick_file_names_table {};
338 /* Set during partial symbol reading, to prevent queueing of full
340 bool reading_partial_symbols = false;
342 /* Table mapping type DIEs to their struct type *.
343 This is NULL if not allocated yet.
344 The mapping is done via (CU/TU + DIE offset) -> type. */
345 htab_t die_type_hash {};
347 /* The CUs we recently read. */
348 VEC (dwarf2_per_cu_ptr) *just_read_cus = NULL;
350 /* Table containing line_header indexed by offset and offset_in_dwz. */
351 htab_t line_header_hash {};
353 /* Table containing all filenames. This is an optional because the
354 table is lazily constructed on first access. */
355 gdb::optional<filename_seen_cache> filenames_cache;
358 static struct dwarf2_per_objfile *dwarf2_per_objfile;
360 /* Default names of the debugging sections. */
362 /* Note that if the debugging section has been compressed, it might
363 have a name like .zdebug_info. */
365 static const struct dwarf2_debug_sections dwarf2_elf_names =
367 { ".debug_info", ".zdebug_info" },
368 { ".debug_abbrev", ".zdebug_abbrev" },
369 { ".debug_line", ".zdebug_line" },
370 { ".debug_loc", ".zdebug_loc" },
371 { ".debug_loclists", ".zdebug_loclists" },
372 { ".debug_macinfo", ".zdebug_macinfo" },
373 { ".debug_macro", ".zdebug_macro" },
374 { ".debug_str", ".zdebug_str" },
375 { ".debug_line_str", ".zdebug_line_str" },
376 { ".debug_ranges", ".zdebug_ranges" },
377 { ".debug_rnglists", ".zdebug_rnglists" },
378 { ".debug_types", ".zdebug_types" },
379 { ".debug_addr", ".zdebug_addr" },
380 { ".debug_frame", ".zdebug_frame" },
381 { ".eh_frame", NULL },
382 { ".gdb_index", ".zgdb_index" },
386 /* List of DWO/DWP sections. */
388 static const struct dwop_section_names
390 struct dwarf2_section_names abbrev_dwo;
391 struct dwarf2_section_names info_dwo;
392 struct dwarf2_section_names line_dwo;
393 struct dwarf2_section_names loc_dwo;
394 struct dwarf2_section_names loclists_dwo;
395 struct dwarf2_section_names macinfo_dwo;
396 struct dwarf2_section_names macro_dwo;
397 struct dwarf2_section_names str_dwo;
398 struct dwarf2_section_names str_offsets_dwo;
399 struct dwarf2_section_names types_dwo;
400 struct dwarf2_section_names cu_index;
401 struct dwarf2_section_names tu_index;
405 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
406 { ".debug_info.dwo", ".zdebug_info.dwo" },
407 { ".debug_line.dwo", ".zdebug_line.dwo" },
408 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
409 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
410 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
411 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
412 { ".debug_str.dwo", ".zdebug_str.dwo" },
413 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
414 { ".debug_types.dwo", ".zdebug_types.dwo" },
415 { ".debug_cu_index", ".zdebug_cu_index" },
416 { ".debug_tu_index", ".zdebug_tu_index" },
419 /* local data types */
421 /* The data in a compilation unit header, after target2host
422 translation, looks like this. */
423 struct comp_unit_head
427 unsigned char addr_size;
428 unsigned char signed_addr_p;
429 sect_offset abbrev_sect_off;
431 /* Size of file offsets; either 4 or 8. */
432 unsigned int offset_size;
434 /* Size of the length field; either 4 or 12. */
435 unsigned int initial_length_size;
437 enum dwarf_unit_type unit_type;
439 /* Offset to the first byte of this compilation unit header in the
440 .debug_info section, for resolving relative reference dies. */
441 sect_offset sect_off;
443 /* Offset to first die in this cu from the start of the cu.
444 This will be the first byte following the compilation unit header. */
445 cu_offset first_die_cu_offset;
447 /* 64-bit signature of this type unit - it is valid only for
448 UNIT_TYPE DW_UT_type. */
451 /* For types, offset in the type's DIE of the type defined by this TU. */
452 cu_offset type_cu_offset_in_tu;
455 /* Type used for delaying computation of method physnames.
456 See comments for compute_delayed_physnames. */
457 struct delayed_method_info
459 /* The type to which the method is attached, i.e., its parent class. */
462 /* The index of the method in the type's function fieldlists. */
465 /* The index of the method in the fieldlist. */
468 /* The name of the DIE. */
471 /* The DIE associated with this method. */
472 struct die_info *die;
475 typedef struct delayed_method_info delayed_method_info;
476 DEF_VEC_O (delayed_method_info);
478 /* Internal state when decoding a particular compilation unit. */
481 /* The objfile containing this compilation unit. */
482 struct objfile *objfile;
484 /* The header of the compilation unit. */
485 struct comp_unit_head header;
487 /* Base address of this compilation unit. */
488 CORE_ADDR base_address;
490 /* Non-zero if base_address has been set. */
493 /* The language we are debugging. */
494 enum language language;
495 const struct language_defn *language_defn;
497 const char *producer;
499 /* The generic symbol table building routines have separate lists for
500 file scope symbols and all all other scopes (local scopes). So
501 we need to select the right one to pass to add_symbol_to_list().
502 We do it by keeping a pointer to the correct list in list_in_scope.
504 FIXME: The original dwarf code just treated the file scope as the
505 first local scope, and all other local scopes as nested local
506 scopes, and worked fine. Check to see if we really need to
507 distinguish these in buildsym.c. */
508 struct pending **list_in_scope;
510 /* The abbrev table for this CU.
511 Normally this points to the abbrev table in the objfile.
512 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
513 struct abbrev_table *abbrev_table;
515 /* Hash table holding all the loaded partial DIEs
516 with partial_die->offset.SECT_OFF as hash. */
519 /* Storage for things with the same lifetime as this read-in compilation
520 unit, including partial DIEs. */
521 struct obstack comp_unit_obstack;
523 /* When multiple dwarf2_cu structures are living in memory, this field
524 chains them all together, so that they can be released efficiently.
525 We will probably also want a generation counter so that most-recently-used
526 compilation units are cached... */
527 struct dwarf2_per_cu_data *read_in_chain;
529 /* Backlink to our per_cu entry. */
530 struct dwarf2_per_cu_data *per_cu;
532 /* How many compilation units ago was this CU last referenced? */
535 /* A hash table of DIE cu_offset for following references with
536 die_info->offset.sect_off as hash. */
539 /* Full DIEs if read in. */
540 struct die_info *dies;
542 /* A set of pointers to dwarf2_per_cu_data objects for compilation
543 units referenced by this one. Only set during full symbol processing;
544 partial symbol tables do not have dependencies. */
547 /* Header data from the line table, during full symbol processing. */
548 struct line_header *line_header;
550 /* A list of methods which need to have physnames computed
551 after all type information has been read. */
552 VEC (delayed_method_info) *method_list;
554 /* To be copied to symtab->call_site_htab. */
555 htab_t call_site_htab;
557 /* Non-NULL if this CU came from a DWO file.
558 There is an invariant here that is important to remember:
559 Except for attributes copied from the top level DIE in the "main"
560 (or "stub") file in preparation for reading the DWO file
561 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
562 Either there isn't a DWO file (in which case this is NULL and the point
563 is moot), or there is and either we're not going to read it (in which
564 case this is NULL) or there is and we are reading it (in which case this
566 struct dwo_unit *dwo_unit;
568 /* The DW_AT_addr_base attribute if present, zero otherwise
569 (zero is a valid value though).
570 Note this value comes from the Fission stub CU/TU's DIE. */
573 /* The DW_AT_ranges_base attribute if present, zero otherwise
574 (zero is a valid value though).
575 Note this value comes from the Fission stub CU/TU's DIE.
576 Also note that the value is zero in the non-DWO case so this value can
577 be used without needing to know whether DWO files are in use or not.
578 N.B. This does not apply to DW_AT_ranges appearing in
579 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
580 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
581 DW_AT_ranges_base *would* have to be applied, and we'd have to care
582 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
583 ULONGEST ranges_base;
585 /* Mark used when releasing cached dies. */
586 unsigned int mark : 1;
588 /* This CU references .debug_loc. See the symtab->locations_valid field.
589 This test is imperfect as there may exist optimized debug code not using
590 any location list and still facing inlining issues if handled as
591 unoptimized code. For a future better test see GCC PR other/32998. */
592 unsigned int has_loclist : 1;
594 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
595 if all the producer_is_* fields are valid. This information is cached
596 because profiling CU expansion showed excessive time spent in
597 producer_is_gxx_lt_4_6. */
598 unsigned int checked_producer : 1;
599 unsigned int producer_is_gxx_lt_4_6 : 1;
600 unsigned int producer_is_gcc_lt_4_3 : 1;
601 unsigned int producer_is_icc : 1;
603 /* When set, the file that we're processing is known to have
604 debugging info for C++ namespaces. GCC 3.3.x did not produce
605 this information, but later versions do. */
607 unsigned int processing_has_namespace_info : 1;
610 /* Persistent data held for a compilation unit, even when not
611 processing it. We put a pointer to this structure in the
612 read_symtab_private field of the psymtab. */
614 struct dwarf2_per_cu_data
616 /* The start offset and length of this compilation unit.
617 NOTE: Unlike comp_unit_head.length, this length includes
619 If the DIE refers to a DWO file, this is always of the original die,
621 sect_offset sect_off;
624 /* DWARF standard version this data has been read from (such as 4 or 5). */
627 /* Flag indicating this compilation unit will be read in before
628 any of the current compilation units are processed. */
629 unsigned int queued : 1;
631 /* This flag will be set when reading partial DIEs if we need to load
632 absolutely all DIEs for this compilation unit, instead of just the ones
633 we think are interesting. It gets set if we look for a DIE in the
634 hash table and don't find it. */
635 unsigned int load_all_dies : 1;
637 /* Non-zero if this CU is from .debug_types.
638 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
640 unsigned int is_debug_types : 1;
642 /* Non-zero if this CU is from the .dwz file. */
643 unsigned int is_dwz : 1;
645 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
646 This flag is only valid if is_debug_types is true.
647 We can't read a CU directly from a DWO file: There are required
648 attributes in the stub. */
649 unsigned int reading_dwo_directly : 1;
651 /* Non-zero if the TU has been read.
652 This is used to assist the "Stay in DWO Optimization" for Fission:
653 When reading a DWO, it's faster to read TUs from the DWO instead of
654 fetching them from random other DWOs (due to comdat folding).
655 If the TU has already been read, the optimization is unnecessary
656 (and unwise - we don't want to change where gdb thinks the TU lives
658 This flag is only valid if is_debug_types is true. */
659 unsigned int tu_read : 1;
661 /* The section this CU/TU lives in.
662 If the DIE refers to a DWO file, this is always the original die,
664 struct dwarf2_section_info *section;
666 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
667 of the CU cache it gets reset to NULL again. This is left as NULL for
668 dummy CUs (a CU header, but nothing else). */
669 struct dwarf2_cu *cu;
671 /* The corresponding objfile.
672 Normally we can get the objfile from dwarf2_per_objfile.
673 However we can enter this file with just a "per_cu" handle. */
674 struct objfile *objfile;
676 /* When dwarf2_per_objfile->using_index is true, the 'quick' field
677 is active. Otherwise, the 'psymtab' field is active. */
680 /* The partial symbol table associated with this compilation unit,
681 or NULL for unread partial units. */
682 struct partial_symtab *psymtab;
684 /* Data needed by the "quick" functions. */
685 struct dwarf2_per_cu_quick_data *quick;
688 /* The CUs we import using DW_TAG_imported_unit. This is filled in
689 while reading psymtabs, used to compute the psymtab dependencies,
690 and then cleared. Then it is filled in again while reading full
691 symbols, and only deleted when the objfile is destroyed.
693 This is also used to work around a difference between the way gold
694 generates .gdb_index version <=7 and the way gdb does. Arguably this
695 is a gold bug. For symbols coming from TUs, gold records in the index
696 the CU that includes the TU instead of the TU itself. This breaks
697 dw2_lookup_symbol: It assumes that if the index says symbol X lives
698 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
699 will find X. Alas TUs live in their own symtab, so after expanding CU Y
700 we need to look in TU Z to find X. Fortunately, this is akin to
701 DW_TAG_imported_unit, so we just use the same mechanism: For
702 .gdb_index version <=7 this also records the TUs that the CU referred
703 to. Concurrently with this change gdb was modified to emit version 8
704 indices so we only pay a price for gold generated indices.
705 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
706 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
709 /* Entry in the signatured_types hash table. */
711 struct signatured_type
713 /* The "per_cu" object of this type.
714 This struct is used iff per_cu.is_debug_types.
715 N.B.: This is the first member so that it's easy to convert pointers
717 struct dwarf2_per_cu_data per_cu;
719 /* The type's signature. */
722 /* Offset in the TU of the type's DIE, as read from the TU header.
723 If this TU is a DWO stub and the definition lives in a DWO file
724 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
725 cu_offset type_offset_in_tu;
727 /* Offset in the section of the type's DIE.
728 If the definition lives in a DWO file, this is the offset in the
729 .debug_types.dwo section.
730 The value is zero until the actual value is known.
731 Zero is otherwise not a valid section offset. */
732 sect_offset type_offset_in_section;
734 /* Type units are grouped by their DW_AT_stmt_list entry so that they
735 can share them. This points to the containing symtab. */
736 struct type_unit_group *type_unit_group;
739 The first time we encounter this type we fully read it in and install it
740 in the symbol tables. Subsequent times we only need the type. */
743 /* Containing DWO unit.
744 This field is valid iff per_cu.reading_dwo_directly. */
745 struct dwo_unit *dwo_unit;
748 typedef struct signatured_type *sig_type_ptr;
749 DEF_VEC_P (sig_type_ptr);
751 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
752 This includes type_unit_group and quick_file_names. */
754 struct stmt_list_hash
756 /* The DWO unit this table is from or NULL if there is none. */
757 struct dwo_unit *dwo_unit;
759 /* Offset in .debug_line or .debug_line.dwo. */
760 sect_offset line_sect_off;
763 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
764 an object of this type. */
766 struct type_unit_group
768 /* dwarf2read.c's main "handle" on a TU symtab.
769 To simplify things we create an artificial CU that "includes" all the
770 type units using this stmt_list so that the rest of the code still has
771 a "per_cu" handle on the symtab.
772 This PER_CU is recognized by having no section. */
773 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
774 struct dwarf2_per_cu_data per_cu;
776 /* The TUs that share this DW_AT_stmt_list entry.
777 This is added to while parsing type units to build partial symtabs,
778 and is deleted afterwards and not used again. */
779 VEC (sig_type_ptr) *tus;
781 /* The compunit symtab.
782 Type units in a group needn't all be defined in the same source file,
783 so we create an essentially anonymous symtab as the compunit symtab. */
784 struct compunit_symtab *compunit_symtab;
786 /* The data used to construct the hash key. */
787 struct stmt_list_hash hash;
789 /* The number of symtabs from the line header.
790 The value here must match line_header.num_file_names. */
791 unsigned int num_symtabs;
793 /* The symbol tables for this TU (obtained from the files listed in
795 WARNING: The order of entries here must match the order of entries
796 in the line header. After the first TU using this type_unit_group, the
797 line header for the subsequent TUs is recreated from this. This is done
798 because we need to use the same symtabs for each TU using the same
799 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
800 there's no guarantee the line header doesn't have duplicate entries. */
801 struct symtab **symtabs;
804 /* These sections are what may appear in a (real or virtual) DWO file. */
808 struct dwarf2_section_info abbrev;
809 struct dwarf2_section_info line;
810 struct dwarf2_section_info loc;
811 struct dwarf2_section_info loclists;
812 struct dwarf2_section_info macinfo;
813 struct dwarf2_section_info macro;
814 struct dwarf2_section_info str;
815 struct dwarf2_section_info str_offsets;
816 /* In the case of a virtual DWO file, these two are unused. */
817 struct dwarf2_section_info info;
818 VEC (dwarf2_section_info_def) *types;
821 /* CUs/TUs in DWP/DWO files. */
825 /* Backlink to the containing struct dwo_file. */
826 struct dwo_file *dwo_file;
828 /* The "id" that distinguishes this CU/TU.
829 .debug_info calls this "dwo_id", .debug_types calls this "signature".
830 Since signatures came first, we stick with it for consistency. */
833 /* The section this CU/TU lives in, in the DWO file. */
834 struct dwarf2_section_info *section;
836 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
837 sect_offset sect_off;
840 /* For types, offset in the type's DIE of the type defined by this TU. */
841 cu_offset type_offset_in_tu;
844 /* include/dwarf2.h defines the DWP section codes.
845 It defines a max value but it doesn't define a min value, which we
846 use for error checking, so provide one. */
848 enum dwp_v2_section_ids
853 /* Data for one DWO file.
855 This includes virtual DWO files (a virtual DWO file is a DWO file as it
856 appears in a DWP file). DWP files don't really have DWO files per se -
857 comdat folding of types "loses" the DWO file they came from, and from
858 a high level view DWP files appear to contain a mass of random types.
859 However, to maintain consistency with the non-DWP case we pretend DWP
860 files contain virtual DWO files, and we assign each TU with one virtual
861 DWO file (generally based on the line and abbrev section offsets -
862 a heuristic that seems to work in practice). */
866 /* The DW_AT_GNU_dwo_name attribute.
867 For virtual DWO files the name is constructed from the section offsets
868 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
869 from related CU+TUs. */
870 const char *dwo_name;
872 /* The DW_AT_comp_dir attribute. */
873 const char *comp_dir;
875 /* The bfd, when the file is open. Otherwise this is NULL.
876 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
879 /* The sections that make up this DWO file.
880 Remember that for virtual DWO files in DWP V2, these are virtual
881 sections (for lack of a better name). */
882 struct dwo_sections sections;
884 /* The CUs in the file.
885 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
886 an extension to handle LLVM's Link Time Optimization output (where
887 multiple source files may be compiled into a single object/dwo pair). */
890 /* Table of TUs in the file.
891 Each element is a struct dwo_unit. */
895 /* These sections are what may appear in a DWP file. */
899 /* These are used by both DWP version 1 and 2. */
900 struct dwarf2_section_info str;
901 struct dwarf2_section_info cu_index;
902 struct dwarf2_section_info tu_index;
904 /* These are only used by DWP version 2 files.
905 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
906 sections are referenced by section number, and are not recorded here.
907 In DWP version 2 there is at most one copy of all these sections, each
908 section being (effectively) comprised of the concatenation of all of the
909 individual sections that exist in the version 1 format.
910 To keep the code simple we treat each of these concatenated pieces as a
911 section itself (a virtual section?). */
912 struct dwarf2_section_info abbrev;
913 struct dwarf2_section_info info;
914 struct dwarf2_section_info line;
915 struct dwarf2_section_info loc;
916 struct dwarf2_section_info macinfo;
917 struct dwarf2_section_info macro;
918 struct dwarf2_section_info str_offsets;
919 struct dwarf2_section_info types;
922 /* These sections are what may appear in a virtual DWO file in DWP version 1.
923 A virtual DWO file is a DWO file as it appears in a DWP file. */
925 struct virtual_v1_dwo_sections
927 struct dwarf2_section_info abbrev;
928 struct dwarf2_section_info line;
929 struct dwarf2_section_info loc;
930 struct dwarf2_section_info macinfo;
931 struct dwarf2_section_info macro;
932 struct dwarf2_section_info str_offsets;
933 /* Each DWP hash table entry records one CU or one TU.
934 That is recorded here, and copied to dwo_unit.section. */
935 struct dwarf2_section_info info_or_types;
938 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
939 In version 2, the sections of the DWO files are concatenated together
940 and stored in one section of that name. Thus each ELF section contains
941 several "virtual" sections. */
943 struct virtual_v2_dwo_sections
945 bfd_size_type abbrev_offset;
946 bfd_size_type abbrev_size;
948 bfd_size_type line_offset;
949 bfd_size_type line_size;
951 bfd_size_type loc_offset;
952 bfd_size_type loc_size;
954 bfd_size_type macinfo_offset;
955 bfd_size_type macinfo_size;
957 bfd_size_type macro_offset;
958 bfd_size_type macro_size;
960 bfd_size_type str_offsets_offset;
961 bfd_size_type str_offsets_size;
963 /* Each DWP hash table entry records one CU or one TU.
964 That is recorded here, and copied to dwo_unit.section. */
965 bfd_size_type info_or_types_offset;
966 bfd_size_type info_or_types_size;
969 /* Contents of DWP hash tables. */
971 struct dwp_hash_table
973 uint32_t version, nr_columns;
974 uint32_t nr_units, nr_slots;
975 const gdb_byte *hash_table, *unit_table;
980 const gdb_byte *indices;
984 /* This is indexed by column number and gives the id of the section
986 #define MAX_NR_V2_DWO_SECTIONS \
987 (1 /* .debug_info or .debug_types */ \
988 + 1 /* .debug_abbrev */ \
989 + 1 /* .debug_line */ \
990 + 1 /* .debug_loc */ \
991 + 1 /* .debug_str_offsets */ \
992 + 1 /* .debug_macro or .debug_macinfo */)
993 int section_ids[MAX_NR_V2_DWO_SECTIONS];
994 const gdb_byte *offsets;
995 const gdb_byte *sizes;
1000 /* Data for one DWP file. */
1004 /* Name of the file. */
1007 /* File format version. */
1013 /* Section info for this file. */
1014 struct dwp_sections sections;
1016 /* Table of CUs in the file. */
1017 const struct dwp_hash_table *cus;
1019 /* Table of TUs in the file. */
1020 const struct dwp_hash_table *tus;
1022 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
1026 /* Table to map ELF section numbers to their sections.
1027 This is only needed for the DWP V1 file format. */
1028 unsigned int num_sections;
1029 asection **elf_sections;
1032 /* This represents a '.dwz' file. */
1036 /* A dwz file can only contain a few sections. */
1037 struct dwarf2_section_info abbrev;
1038 struct dwarf2_section_info info;
1039 struct dwarf2_section_info str;
1040 struct dwarf2_section_info line;
1041 struct dwarf2_section_info macro;
1042 struct dwarf2_section_info gdb_index;
1044 /* The dwz's BFD. */
1048 /* Struct used to pass misc. parameters to read_die_and_children, et
1049 al. which are used for both .debug_info and .debug_types dies.
1050 All parameters here are unchanging for the life of the call. This
1051 struct exists to abstract away the constant parameters of die reading. */
1053 struct die_reader_specs
1055 /* The bfd of die_section. */
1058 /* The CU of the DIE we are parsing. */
1059 struct dwarf2_cu *cu;
1061 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
1062 struct dwo_file *dwo_file;
1064 /* The section the die comes from.
1065 This is either .debug_info or .debug_types, or the .dwo variants. */
1066 struct dwarf2_section_info *die_section;
1068 /* die_section->buffer. */
1069 const gdb_byte *buffer;
1071 /* The end of the buffer. */
1072 const gdb_byte *buffer_end;
1074 /* The value of the DW_AT_comp_dir attribute. */
1075 const char *comp_dir;
1078 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1079 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1080 const gdb_byte *info_ptr,
1081 struct die_info *comp_unit_die,
1085 /* A 1-based directory index. This is a strong typedef to prevent
1086 accidentally using a directory index as a 0-based index into an
1088 enum class dir_index : unsigned int {};
1090 /* Likewise, a 1-based file name index. */
1091 enum class file_name_index : unsigned int {};
1095 file_entry () = default;
1097 file_entry (const char *name_, dir_index d_index_,
1098 unsigned int mod_time_, unsigned int length_)
1101 mod_time (mod_time_),
1105 /* Return the include directory at D_INDEX stored in LH. Returns
1106 NULL if D_INDEX is out of bounds. */
1107 const char *include_dir (const line_header *lh) const;
1109 /* The file name. Note this is an observing pointer. The memory is
1110 owned by debug_line_buffer. */
1111 const char *name {};
1113 /* The directory index (1-based). */
1114 dir_index d_index {};
1116 unsigned int mod_time {};
1118 unsigned int length {};
1120 /* True if referenced by the Line Number Program. */
1123 /* The associated symbol table, if any. */
1124 struct symtab *symtab {};
1127 /* The line number information for a compilation unit (found in the
1128 .debug_line section) begins with a "statement program header",
1129 which contains the following information. */
1136 /* Add an entry to the include directory table. */
1137 void add_include_dir (const char *include_dir);
1139 /* Add an entry to the file name table. */
1140 void add_file_name (const char *name, dir_index d_index,
1141 unsigned int mod_time, unsigned int length);
1143 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
1144 is out of bounds. */
1145 const char *include_dir_at (dir_index index) const
1147 /* Convert directory index number (1-based) to vector index
1149 size_t vec_index = to_underlying (index) - 1;
1151 if (vec_index >= include_dirs.size ())
1153 return include_dirs[vec_index];
1156 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
1157 is out of bounds. */
1158 file_entry *file_name_at (file_name_index index)
1160 /* Convert file name index number (1-based) to vector index
1162 size_t vec_index = to_underlying (index) - 1;
1164 if (vec_index >= file_names.size ())
1166 return &file_names[vec_index];
1169 /* Const version of the above. */
1170 const file_entry *file_name_at (unsigned int index) const
1172 if (index >= file_names.size ())
1174 return &file_names[index];
1177 /* Offset of line number information in .debug_line section. */
1178 sect_offset sect_off {};
1180 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1181 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1183 unsigned int total_length {};
1184 unsigned short version {};
1185 unsigned int header_length {};
1186 unsigned char minimum_instruction_length {};
1187 unsigned char maximum_ops_per_instruction {};
1188 unsigned char default_is_stmt {};
1190 unsigned char line_range {};
1191 unsigned char opcode_base {};
1193 /* standard_opcode_lengths[i] is the number of operands for the
1194 standard opcode whose value is i. This means that
1195 standard_opcode_lengths[0] is unused, and the last meaningful
1196 element is standard_opcode_lengths[opcode_base - 1]. */
1197 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1199 /* The include_directories table. Note these are observing
1200 pointers. The memory is owned by debug_line_buffer. */
1201 std::vector<const char *> include_dirs;
1203 /* The file_names table. */
1204 std::vector<file_entry> file_names;
1206 /* The start and end of the statement program following this
1207 header. These point into dwarf2_per_objfile->line_buffer. */
1208 const gdb_byte *statement_program_start {}, *statement_program_end {};
1211 typedef std::unique_ptr<line_header> line_header_up;
1214 file_entry::include_dir (const line_header *lh) const
1216 return lh->include_dir_at (d_index);
1219 /* When we construct a partial symbol table entry we only
1220 need this much information. */
1221 struct partial_die_info
1223 /* Offset of this DIE. */
1224 sect_offset sect_off;
1226 /* DWARF-2 tag for this DIE. */
1227 ENUM_BITFIELD(dwarf_tag) tag : 16;
1229 /* Assorted flags describing the data found in this DIE. */
1230 unsigned int has_children : 1;
1231 unsigned int is_external : 1;
1232 unsigned int is_declaration : 1;
1233 unsigned int has_type : 1;
1234 unsigned int has_specification : 1;
1235 unsigned int has_pc_info : 1;
1236 unsigned int may_be_inlined : 1;
1238 /* This DIE has been marked DW_AT_main_subprogram. */
1239 unsigned int main_subprogram : 1;
1241 /* Flag set if the SCOPE field of this structure has been
1243 unsigned int scope_set : 1;
1245 /* Flag set if the DIE has a byte_size attribute. */
1246 unsigned int has_byte_size : 1;
1248 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1249 unsigned int has_const_value : 1;
1251 /* Flag set if any of the DIE's children are template arguments. */
1252 unsigned int has_template_arguments : 1;
1254 /* Flag set if fixup_partial_die has been called on this die. */
1255 unsigned int fixup_called : 1;
1257 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1258 unsigned int is_dwz : 1;
1260 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1261 unsigned int spec_is_dwz : 1;
1263 /* The name of this DIE. Normally the value of DW_AT_name, but
1264 sometimes a default name for unnamed DIEs. */
1267 /* The linkage name, if present. */
1268 const char *linkage_name;
1270 /* The scope to prepend to our children. This is generally
1271 allocated on the comp_unit_obstack, so will disappear
1272 when this compilation unit leaves the cache. */
1275 /* Some data associated with the partial DIE. The tag determines
1276 which field is live. */
1279 /* The location description associated with this DIE, if any. */
1280 struct dwarf_block *locdesc;
1281 /* The offset of an import, for DW_TAG_imported_unit. */
1282 sect_offset sect_off;
1285 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1289 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1290 DW_AT_sibling, if any. */
1291 /* NOTE: This member isn't strictly necessary, read_partial_die could
1292 return DW_AT_sibling values to its caller load_partial_dies. */
1293 const gdb_byte *sibling;
1295 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1296 DW_AT_specification (or DW_AT_abstract_origin or
1297 DW_AT_extension). */
1298 sect_offset spec_offset;
1300 /* Pointers to this DIE's parent, first child, and next sibling,
1302 struct partial_die_info *die_parent, *die_child, *die_sibling;
1305 /* This data structure holds the information of an abbrev. */
1308 unsigned int number; /* number identifying abbrev */
1309 enum dwarf_tag tag; /* dwarf tag */
1310 unsigned short has_children; /* boolean */
1311 unsigned short num_attrs; /* number of attributes */
1312 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1313 struct abbrev_info *next; /* next in chain */
1318 ENUM_BITFIELD(dwarf_attribute) name : 16;
1319 ENUM_BITFIELD(dwarf_form) form : 16;
1321 /* It is valid only if FORM is DW_FORM_implicit_const. */
1322 LONGEST implicit_const;
1325 /* Size of abbrev_table.abbrev_hash_table. */
1326 #define ABBREV_HASH_SIZE 121
1328 /* Top level data structure to contain an abbreviation table. */
1332 /* Where the abbrev table came from.
1333 This is used as a sanity check when the table is used. */
1334 sect_offset sect_off;
1336 /* Storage for the abbrev table. */
1337 struct obstack abbrev_obstack;
1339 /* Hash table of abbrevs.
1340 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1341 It could be statically allocated, but the previous code didn't so we
1343 struct abbrev_info **abbrevs;
1346 /* Attributes have a name and a value. */
1349 ENUM_BITFIELD(dwarf_attribute) name : 16;
1350 ENUM_BITFIELD(dwarf_form) form : 15;
1352 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1353 field should be in u.str (existing only for DW_STRING) but it is kept
1354 here for better struct attribute alignment. */
1355 unsigned int string_is_canonical : 1;
1360 struct dwarf_block *blk;
1369 /* This data structure holds a complete die structure. */
1372 /* DWARF-2 tag for this DIE. */
1373 ENUM_BITFIELD(dwarf_tag) tag : 16;
1375 /* Number of attributes */
1376 unsigned char num_attrs;
1378 /* True if we're presently building the full type name for the
1379 type derived from this DIE. */
1380 unsigned char building_fullname : 1;
1382 /* True if this die is in process. PR 16581. */
1383 unsigned char in_process : 1;
1386 unsigned int abbrev;
1388 /* Offset in .debug_info or .debug_types section. */
1389 sect_offset sect_off;
1391 /* The dies in a compilation unit form an n-ary tree. PARENT
1392 points to this die's parent; CHILD points to the first child of
1393 this node; and all the children of a given node are chained
1394 together via their SIBLING fields. */
1395 struct die_info *child; /* Its first child, if any. */
1396 struct die_info *sibling; /* Its next sibling, if any. */
1397 struct die_info *parent; /* Its parent, if any. */
1399 /* An array of attributes, with NUM_ATTRS elements. There may be
1400 zero, but it's not common and zero-sized arrays are not
1401 sufficiently portable C. */
1402 struct attribute attrs[1];
1405 /* Get at parts of an attribute structure. */
1407 #define DW_STRING(attr) ((attr)->u.str)
1408 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1409 #define DW_UNSND(attr) ((attr)->u.unsnd)
1410 #define DW_BLOCK(attr) ((attr)->u.blk)
1411 #define DW_SND(attr) ((attr)->u.snd)
1412 #define DW_ADDR(attr) ((attr)->u.addr)
1413 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1415 /* Blocks are a bunch of untyped bytes. */
1420 /* Valid only if SIZE is not zero. */
1421 const gdb_byte *data;
1424 #ifndef ATTR_ALLOC_CHUNK
1425 #define ATTR_ALLOC_CHUNK 4
1428 /* Allocate fields for structs, unions and enums in this size. */
1429 #ifndef DW_FIELD_ALLOC_CHUNK
1430 #define DW_FIELD_ALLOC_CHUNK 4
1433 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1434 but this would require a corresponding change in unpack_field_as_long
1436 static int bits_per_byte = 8;
1440 struct nextfield *next;
1448 struct nextfnfield *next;
1449 struct fn_field fnfield;
1456 struct nextfnfield *head;
1459 struct typedef_field_list
1461 struct typedef_field field;
1462 struct typedef_field_list *next;
1465 /* The routines that read and process dies for a C struct or C++ class
1466 pass lists of data member fields and lists of member function fields
1467 in an instance of a field_info structure, as defined below. */
1470 /* List of data member and baseclasses fields. */
1471 struct nextfield *fields, *baseclasses;
1473 /* Number of fields (including baseclasses). */
1476 /* Number of baseclasses. */
1479 /* Set if the accesibility of one of the fields is not public. */
1480 int non_public_fields;
1482 /* Member function fields array, entries are allocated in the order they
1483 are encountered in the object file. */
1484 struct nextfnfield *fnfields;
1486 /* Member function fieldlist array, contains name of possibly overloaded
1487 member function, number of overloaded member functions and a pointer
1488 to the head of the member function field chain. */
1489 struct fnfieldlist *fnfieldlists;
1491 /* Number of entries in the fnfieldlists array. */
1494 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1495 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1496 struct typedef_field_list *typedef_field_list;
1497 unsigned typedef_field_list_count;
1500 /* One item on the queue of compilation units to read in full symbols
1502 struct dwarf2_queue_item
1504 struct dwarf2_per_cu_data *per_cu;
1505 enum language pretend_language;
1506 struct dwarf2_queue_item *next;
1509 /* The current queue. */
1510 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1512 /* Loaded secondary compilation units are kept in memory until they
1513 have not been referenced for the processing of this many
1514 compilation units. Set this to zero to disable caching. Cache
1515 sizes of up to at least twenty will improve startup time for
1516 typical inter-CU-reference binaries, at an obvious memory cost. */
1517 static int dwarf_max_cache_age = 5;
1519 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1520 struct cmd_list_element *c, const char *value)
1522 fprintf_filtered (file, _("The upper bound on the age of cached "
1523 "DWARF compilation units is %s.\n"),
1527 /* local function prototypes */
1529 static const char *get_section_name (const struct dwarf2_section_info *);
1531 static const char *get_section_file_name (const struct dwarf2_section_info *);
1533 static void dwarf2_find_base_address (struct die_info *die,
1534 struct dwarf2_cu *cu);
1536 static struct partial_symtab *create_partial_symtab
1537 (struct dwarf2_per_cu_data *per_cu, const char *name);
1539 static void dwarf2_build_psymtabs_hard (struct objfile *);
1541 static void scan_partial_symbols (struct partial_die_info *,
1542 CORE_ADDR *, CORE_ADDR *,
1543 int, struct dwarf2_cu *);
1545 static void add_partial_symbol (struct partial_die_info *,
1546 struct dwarf2_cu *);
1548 static void add_partial_namespace (struct partial_die_info *pdi,
1549 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1550 int set_addrmap, struct dwarf2_cu *cu);
1552 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1553 CORE_ADDR *highpc, int set_addrmap,
1554 struct dwarf2_cu *cu);
1556 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1557 struct dwarf2_cu *cu);
1559 static void add_partial_subprogram (struct partial_die_info *pdi,
1560 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1561 int need_pc, struct dwarf2_cu *cu);
1563 static void dwarf2_read_symtab (struct partial_symtab *,
1566 static void psymtab_to_symtab_1 (struct partial_symtab *);
1568 static struct abbrev_info *abbrev_table_lookup_abbrev
1569 (const struct abbrev_table *, unsigned int);
1571 static struct abbrev_table *abbrev_table_read_table
1572 (struct dwarf2_section_info *, sect_offset);
1574 static void abbrev_table_free (struct abbrev_table *);
1576 static void abbrev_table_free_cleanup (void *);
1578 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1579 struct dwarf2_section_info *);
1581 static void dwarf2_free_abbrev_table (void *);
1583 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1585 static struct partial_die_info *load_partial_dies
1586 (const struct die_reader_specs *, const gdb_byte *, int);
1588 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1589 struct partial_die_info *,
1590 struct abbrev_info *,
1594 static struct partial_die_info *find_partial_die (sect_offset, int,
1595 struct dwarf2_cu *);
1597 static void fixup_partial_die (struct partial_die_info *,
1598 struct dwarf2_cu *);
1600 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1601 struct attribute *, struct attr_abbrev *,
1604 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1606 static int read_1_signed_byte (bfd *, const gdb_byte *);
1608 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1610 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1612 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1614 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1617 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1619 static LONGEST read_checked_initial_length_and_offset
1620 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1621 unsigned int *, unsigned int *);
1623 static LONGEST read_offset (bfd *, const gdb_byte *,
1624 const struct comp_unit_head *,
1627 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1629 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1632 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1634 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1636 static const char *read_indirect_string (bfd *, const gdb_byte *,
1637 const struct comp_unit_head *,
1640 static const char *read_indirect_line_string (bfd *, const gdb_byte *,
1641 const struct comp_unit_head *,
1644 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1646 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1648 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1652 static const char *read_str_index (const struct die_reader_specs *reader,
1653 ULONGEST str_index);
1655 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1657 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1658 struct dwarf2_cu *);
1660 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1663 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1664 struct dwarf2_cu *cu);
1666 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1667 struct dwarf2_cu *cu);
1669 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1671 static struct die_info *die_specification (struct die_info *die,
1672 struct dwarf2_cu **);
1674 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1675 struct dwarf2_cu *cu);
1677 static void dwarf_decode_lines (struct line_header *, const char *,
1678 struct dwarf2_cu *, struct partial_symtab *,
1679 CORE_ADDR, int decode_mapping);
1681 static void dwarf2_start_subfile (const char *, const char *);
1683 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1684 const char *, const char *,
1687 static struct symbol *new_symbol (struct die_info *, struct type *,
1688 struct dwarf2_cu *);
1690 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1691 struct dwarf2_cu *, struct symbol *);
1693 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1694 struct dwarf2_cu *);
1696 static void dwarf2_const_value_attr (const struct attribute *attr,
1699 struct obstack *obstack,
1700 struct dwarf2_cu *cu, LONGEST *value,
1701 const gdb_byte **bytes,
1702 struct dwarf2_locexpr_baton **baton);
1704 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1706 static int need_gnat_info (struct dwarf2_cu *);
1708 static struct type *die_descriptive_type (struct die_info *,
1709 struct dwarf2_cu *);
1711 static void set_descriptive_type (struct type *, struct die_info *,
1712 struct dwarf2_cu *);
1714 static struct type *die_containing_type (struct die_info *,
1715 struct dwarf2_cu *);
1717 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1718 struct dwarf2_cu *);
1720 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1722 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1724 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1726 static char *typename_concat (struct obstack *obs, const char *prefix,
1727 const char *suffix, int physname,
1728 struct dwarf2_cu *cu);
1730 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1732 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1734 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1736 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1738 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1740 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1741 struct dwarf2_cu *, struct partial_symtab *);
1743 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1744 values. Keep the items ordered with increasing constraints compliance. */
1747 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1748 PC_BOUNDS_NOT_PRESENT,
1750 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1751 were present but they do not form a valid range of PC addresses. */
1754 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1757 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1761 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1762 CORE_ADDR *, CORE_ADDR *,
1764 struct partial_symtab *);
1766 static void get_scope_pc_bounds (struct die_info *,
1767 CORE_ADDR *, CORE_ADDR *,
1768 struct dwarf2_cu *);
1770 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1771 CORE_ADDR, struct dwarf2_cu *);
1773 static void dwarf2_add_field (struct field_info *, struct die_info *,
1774 struct dwarf2_cu *);
1776 static void dwarf2_attach_fields_to_type (struct field_info *,
1777 struct type *, struct dwarf2_cu *);
1779 static void dwarf2_add_member_fn (struct field_info *,
1780 struct die_info *, struct type *,
1781 struct dwarf2_cu *);
1783 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1785 struct dwarf2_cu *);
1787 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1789 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1791 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1793 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1795 static struct using_direct **using_directives (enum language);
1797 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1799 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1801 static struct type *read_module_type (struct die_info *die,
1802 struct dwarf2_cu *cu);
1804 static const char *namespace_name (struct die_info *die,
1805 int *is_anonymous, struct dwarf2_cu *);
1807 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1809 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1811 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1812 struct dwarf2_cu *);
1814 static struct die_info *read_die_and_siblings_1
1815 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1818 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1819 const gdb_byte *info_ptr,
1820 const gdb_byte **new_info_ptr,
1821 struct die_info *parent);
1823 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1824 struct die_info **, const gdb_byte *,
1827 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1828 struct die_info **, const gdb_byte *,
1831 static void process_die (struct die_info *, struct dwarf2_cu *);
1833 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1836 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1838 static const char *dwarf2_full_name (const char *name,
1839 struct die_info *die,
1840 struct dwarf2_cu *cu);
1842 static const char *dwarf2_physname (const char *name, struct die_info *die,
1843 struct dwarf2_cu *cu);
1845 static struct die_info *dwarf2_extension (struct die_info *die,
1846 struct dwarf2_cu **);
1848 static const char *dwarf_tag_name (unsigned int);
1850 static const char *dwarf_attr_name (unsigned int);
1852 static const char *dwarf_form_name (unsigned int);
1854 static const char *dwarf_bool_name (unsigned int);
1856 static const char *dwarf_type_encoding_name (unsigned int);
1858 static struct die_info *sibling_die (struct die_info *);
1860 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1862 static void dump_die_for_error (struct die_info *);
1864 static void dump_die_1 (struct ui_file *, int level, int max_level,
1867 /*static*/ void dump_die (struct die_info *, int max_level);
1869 static void store_in_ref_table (struct die_info *,
1870 struct dwarf2_cu *);
1872 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1874 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1876 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1877 const struct attribute *,
1878 struct dwarf2_cu **);
1880 static struct die_info *follow_die_ref (struct die_info *,
1881 const struct attribute *,
1882 struct dwarf2_cu **);
1884 static struct die_info *follow_die_sig (struct die_info *,
1885 const struct attribute *,
1886 struct dwarf2_cu **);
1888 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1889 struct dwarf2_cu *);
1891 static struct type *get_DW_AT_signature_type (struct die_info *,
1892 const struct attribute *,
1893 struct dwarf2_cu *);
1895 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1897 static void read_signatured_type (struct signatured_type *);
1899 static int attr_to_dynamic_prop (const struct attribute *attr,
1900 struct die_info *die, struct dwarf2_cu *cu,
1901 struct dynamic_prop *prop);
1903 /* memory allocation interface */
1905 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1907 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1909 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1911 static int attr_form_is_block (const struct attribute *);
1913 static int attr_form_is_section_offset (const struct attribute *);
1915 static int attr_form_is_constant (const struct attribute *);
1917 static int attr_form_is_ref (const struct attribute *);
1919 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1920 struct dwarf2_loclist_baton *baton,
1921 const struct attribute *attr);
1923 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1925 struct dwarf2_cu *cu,
1928 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1929 const gdb_byte *info_ptr,
1930 struct abbrev_info *abbrev);
1932 static void free_stack_comp_unit (void *);
1934 static hashval_t partial_die_hash (const void *item);
1936 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1938 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1939 (sect_offset sect_off, unsigned int offset_in_dwz, struct objfile *objfile);
1941 static void init_one_comp_unit (struct dwarf2_cu *cu,
1942 struct dwarf2_per_cu_data *per_cu);
1944 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1945 struct die_info *comp_unit_die,
1946 enum language pretend_language);
1948 static void free_heap_comp_unit (void *);
1950 static void free_cached_comp_units (void *);
1952 static void age_cached_comp_units (void);
1954 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1956 static struct type *set_die_type (struct die_info *, struct type *,
1957 struct dwarf2_cu *);
1959 static void create_all_comp_units (struct objfile *);
1961 static int create_all_type_units (struct objfile *);
1963 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1966 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1969 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1972 static void dwarf2_add_dependence (struct dwarf2_cu *,
1973 struct dwarf2_per_cu_data *);
1975 static void dwarf2_mark (struct dwarf2_cu *);
1977 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1979 static struct type *get_die_type_at_offset (sect_offset,
1980 struct dwarf2_per_cu_data *);
1982 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1984 static void dwarf2_release_queue (void *dummy);
1986 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1987 enum language pretend_language);
1989 static void process_queue (void);
1991 /* The return type of find_file_and_directory. Note, the enclosed
1992 string pointers are only valid while this object is valid. */
1994 struct file_and_directory
1996 /* The filename. This is never NULL. */
1999 /* The compilation directory. NULL if not known. If we needed to
2000 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
2001 points directly to the DW_AT_comp_dir string attribute owned by
2002 the obstack that owns the DIE. */
2003 const char *comp_dir;
2005 /* If we needed to build a new string for comp_dir, this is what
2006 owns the storage. */
2007 std::string comp_dir_storage;
2010 static file_and_directory find_file_and_directory (struct die_info *die,
2011 struct dwarf2_cu *cu);
2013 static char *file_full_name (int file, struct line_header *lh,
2014 const char *comp_dir);
2016 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
2017 enum class rcuh_kind { COMPILE, TYPE };
2019 static const gdb_byte *read_and_check_comp_unit_head
2020 (struct comp_unit_head *header,
2021 struct dwarf2_section_info *section,
2022 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
2023 rcuh_kind section_kind);
2025 static void init_cutu_and_read_dies
2026 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
2027 int use_existing_cu, int keep,
2028 die_reader_func_ftype *die_reader_func, void *data);
2030 static void init_cutu_and_read_dies_simple
2031 (struct dwarf2_per_cu_data *this_cu,
2032 die_reader_func_ftype *die_reader_func, void *data);
2034 static htab_t allocate_signatured_type_table (struct objfile *objfile);
2036 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
2038 static struct dwo_unit *lookup_dwo_unit_in_dwp
2039 (struct dwp_file *dwp_file, const char *comp_dir,
2040 ULONGEST signature, int is_debug_types);
2042 static struct dwp_file *get_dwp_file (void);
2044 static struct dwo_unit *lookup_dwo_comp_unit
2045 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
2047 static struct dwo_unit *lookup_dwo_type_unit
2048 (struct signatured_type *, const char *, const char *);
2050 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
2052 static void free_dwo_file_cleanup (void *);
2054 static void process_cu_includes (void);
2056 static void check_producer (struct dwarf2_cu *cu);
2058 static void free_line_header_voidp (void *arg);
2060 /* Various complaints about symbol reading that don't abort the process. */
2063 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2065 complaint (&symfile_complaints,
2066 _("statement list doesn't fit in .debug_line section"));
2070 dwarf2_debug_line_missing_file_complaint (void)
2072 complaint (&symfile_complaints,
2073 _(".debug_line section has line data without a file"));
2077 dwarf2_debug_line_missing_end_sequence_complaint (void)
2079 complaint (&symfile_complaints,
2080 _(".debug_line section has line "
2081 "program sequence without an end"));
2085 dwarf2_complex_location_expr_complaint (void)
2087 complaint (&symfile_complaints, _("location expression too complex"));
2091 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2094 complaint (&symfile_complaints,
2095 _("const value length mismatch for '%s', got %d, expected %d"),
2100 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2102 complaint (&symfile_complaints,
2103 _("debug info runs off end of %s section"
2105 get_section_name (section),
2106 get_section_file_name (section));
2110 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2112 complaint (&symfile_complaints,
2113 _("macro debug info contains a "
2114 "malformed macro definition:\n`%s'"),
2119 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2121 complaint (&symfile_complaints,
2122 _("invalid attribute class or form for '%s' in '%s'"),
2126 /* Hash function for line_header_hash. */
2129 line_header_hash (const struct line_header *ofs)
2131 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2134 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2137 line_header_hash_voidp (const void *item)
2139 const struct line_header *ofs = (const struct line_header *) item;
2141 return line_header_hash (ofs);
2144 /* Equality function for line_header_hash. */
2147 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2149 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2150 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2152 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2153 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2159 /* Convert VALUE between big- and little-endian. */
2161 byte_swap (offset_type value)
2165 result = (value & 0xff) << 24;
2166 result |= (value & 0xff00) << 8;
2167 result |= (value & 0xff0000) >> 8;
2168 result |= (value & 0xff000000) >> 24;
2172 #define MAYBE_SWAP(V) byte_swap (V)
2175 #define MAYBE_SWAP(V) static_cast<offset_type> (V)
2176 #endif /* WORDS_BIGENDIAN */
2178 /* Read the given attribute value as an address, taking the attribute's
2179 form into account. */
2182 attr_value_as_address (struct attribute *attr)
2186 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2188 /* Aside from a few clearly defined exceptions, attributes that
2189 contain an address must always be in DW_FORM_addr form.
2190 Unfortunately, some compilers happen to be violating this
2191 requirement by encoding addresses using other forms, such
2192 as DW_FORM_data4 for example. For those broken compilers,
2193 we try to do our best, without any guarantee of success,
2194 to interpret the address correctly. It would also be nice
2195 to generate a complaint, but that would require us to maintain
2196 a list of legitimate cases where a non-address form is allowed,
2197 as well as update callers to pass in at least the CU's DWARF
2198 version. This is more overhead than what we're willing to
2199 expand for a pretty rare case. */
2200 addr = DW_UNSND (attr);
2203 addr = DW_ADDR (attr);
2208 /* The suffix for an index file. */
2209 #define INDEX_SUFFIX ".gdb-index"
2211 /* See declaration. */
2213 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2214 const dwarf2_debug_sections *names)
2215 : objfile (objfile_)
2218 names = &dwarf2_elf_names;
2220 bfd *obfd = objfile->obfd;
2222 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2223 locate_sections (obfd, sec, *names);
2226 dwarf2_per_objfile::~dwarf2_per_objfile ()
2228 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2229 free_cached_comp_units ();
2231 if (quick_file_names_table)
2232 htab_delete (quick_file_names_table);
2234 if (line_header_hash)
2235 htab_delete (line_header_hash);
2237 /* Everything else should be on the objfile obstack. */
2240 /* See declaration. */
2243 dwarf2_per_objfile::free_cached_comp_units ()
2245 dwarf2_per_cu_data *per_cu = read_in_chain;
2246 dwarf2_per_cu_data **last_chain = &read_in_chain;
2247 while (per_cu != NULL)
2249 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2251 free_heap_comp_unit (per_cu->cu);
2252 *last_chain = next_cu;
2257 /* Try to locate the sections we need for DWARF 2 debugging
2258 information and return true if we have enough to do something.
2259 NAMES points to the dwarf2 section names, or is NULL if the standard
2260 ELF names are used. */
2263 dwarf2_has_info (struct objfile *objfile,
2264 const struct dwarf2_debug_sections *names)
2266 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
2267 objfile_data (objfile, dwarf2_objfile_data_key));
2268 if (!dwarf2_per_objfile)
2270 /* Initialize per-objfile state. */
2271 struct dwarf2_per_objfile *data
2272 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_objfile);
2274 dwarf2_per_objfile = new (data) struct dwarf2_per_objfile (objfile, names);
2275 set_objfile_data (objfile, dwarf2_objfile_data_key, dwarf2_per_objfile);
2277 return (!dwarf2_per_objfile->info.is_virtual
2278 && dwarf2_per_objfile->info.s.section != NULL
2279 && !dwarf2_per_objfile->abbrev.is_virtual
2280 && dwarf2_per_objfile->abbrev.s.section != NULL);
2283 /* Return the containing section of virtual section SECTION. */
2285 static struct dwarf2_section_info *
2286 get_containing_section (const struct dwarf2_section_info *section)
2288 gdb_assert (section->is_virtual);
2289 return section->s.containing_section;
2292 /* Return the bfd owner of SECTION. */
2295 get_section_bfd_owner (const struct dwarf2_section_info *section)
2297 if (section->is_virtual)
2299 section = get_containing_section (section);
2300 gdb_assert (!section->is_virtual);
2302 return section->s.section->owner;
2305 /* Return the bfd section of SECTION.
2306 Returns NULL if the section is not present. */
2309 get_section_bfd_section (const struct dwarf2_section_info *section)
2311 if (section->is_virtual)
2313 section = get_containing_section (section);
2314 gdb_assert (!section->is_virtual);
2316 return section->s.section;
2319 /* Return the name of SECTION. */
2322 get_section_name (const struct dwarf2_section_info *section)
2324 asection *sectp = get_section_bfd_section (section);
2326 gdb_assert (sectp != NULL);
2327 return bfd_section_name (get_section_bfd_owner (section), sectp);
2330 /* Return the name of the file SECTION is in. */
2333 get_section_file_name (const struct dwarf2_section_info *section)
2335 bfd *abfd = get_section_bfd_owner (section);
2337 return bfd_get_filename (abfd);
2340 /* Return the id of SECTION.
2341 Returns 0 if SECTION doesn't exist. */
2344 get_section_id (const struct dwarf2_section_info *section)
2346 asection *sectp = get_section_bfd_section (section);
2353 /* Return the flags of SECTION.
2354 SECTION (or containing section if this is a virtual section) must exist. */
2357 get_section_flags (const struct dwarf2_section_info *section)
2359 asection *sectp = get_section_bfd_section (section);
2361 gdb_assert (sectp != NULL);
2362 return bfd_get_section_flags (sectp->owner, sectp);
2365 /* When loading sections, we look either for uncompressed section or for
2366 compressed section names. */
2369 section_is_p (const char *section_name,
2370 const struct dwarf2_section_names *names)
2372 if (names->normal != NULL
2373 && strcmp (section_name, names->normal) == 0)
2375 if (names->compressed != NULL
2376 && strcmp (section_name, names->compressed) == 0)
2381 /* See declaration. */
2384 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2385 const dwarf2_debug_sections &names)
2387 flagword aflag = bfd_get_section_flags (abfd, sectp);
2389 if ((aflag & SEC_HAS_CONTENTS) == 0)
2392 else if (section_is_p (sectp->name, &names.info))
2394 this->info.s.section = sectp;
2395 this->info.size = bfd_get_section_size (sectp);
2397 else if (section_is_p (sectp->name, &names.abbrev))
2399 this->abbrev.s.section = sectp;
2400 this->abbrev.size = bfd_get_section_size (sectp);
2402 else if (section_is_p (sectp->name, &names.line))
2404 this->line.s.section = sectp;
2405 this->line.size = bfd_get_section_size (sectp);
2407 else if (section_is_p (sectp->name, &names.loc))
2409 this->loc.s.section = sectp;
2410 this->loc.size = bfd_get_section_size (sectp);
2412 else if (section_is_p (sectp->name, &names.loclists))
2414 this->loclists.s.section = sectp;
2415 this->loclists.size = bfd_get_section_size (sectp);
2417 else if (section_is_p (sectp->name, &names.macinfo))
2419 this->macinfo.s.section = sectp;
2420 this->macinfo.size = bfd_get_section_size (sectp);
2422 else if (section_is_p (sectp->name, &names.macro))
2424 this->macro.s.section = sectp;
2425 this->macro.size = bfd_get_section_size (sectp);
2427 else if (section_is_p (sectp->name, &names.str))
2429 this->str.s.section = sectp;
2430 this->str.size = bfd_get_section_size (sectp);
2432 else if (section_is_p (sectp->name, &names.line_str))
2434 this->line_str.s.section = sectp;
2435 this->line_str.size = bfd_get_section_size (sectp);
2437 else if (section_is_p (sectp->name, &names.addr))
2439 this->addr.s.section = sectp;
2440 this->addr.size = bfd_get_section_size (sectp);
2442 else if (section_is_p (sectp->name, &names.frame))
2444 this->frame.s.section = sectp;
2445 this->frame.size = bfd_get_section_size (sectp);
2447 else if (section_is_p (sectp->name, &names.eh_frame))
2449 this->eh_frame.s.section = sectp;
2450 this->eh_frame.size = bfd_get_section_size (sectp);
2452 else if (section_is_p (sectp->name, &names.ranges))
2454 this->ranges.s.section = sectp;
2455 this->ranges.size = bfd_get_section_size (sectp);
2457 else if (section_is_p (sectp->name, &names.rnglists))
2459 this->rnglists.s.section = sectp;
2460 this->rnglists.size = bfd_get_section_size (sectp);
2462 else if (section_is_p (sectp->name, &names.types))
2464 struct dwarf2_section_info type_section;
2466 memset (&type_section, 0, sizeof (type_section));
2467 type_section.s.section = sectp;
2468 type_section.size = bfd_get_section_size (sectp);
2470 VEC_safe_push (dwarf2_section_info_def, this->types,
2473 else if (section_is_p (sectp->name, &names.gdb_index))
2475 this->gdb_index.s.section = sectp;
2476 this->gdb_index.size = bfd_get_section_size (sectp);
2479 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2480 && bfd_section_vma (abfd, sectp) == 0)
2481 this->has_section_at_zero = true;
2484 /* A helper function that decides whether a section is empty,
2488 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2490 if (section->is_virtual)
2491 return section->size == 0;
2492 return section->s.section == NULL || section->size == 0;
2495 /* Read the contents of the section INFO.
2496 OBJFILE is the main object file, but not necessarily the file where
2497 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2499 If the section is compressed, uncompress it before returning. */
2502 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2506 gdb_byte *buf, *retbuf;
2510 info->buffer = NULL;
2513 if (dwarf2_section_empty_p (info))
2516 sectp = get_section_bfd_section (info);
2518 /* If this is a virtual section we need to read in the real one first. */
2519 if (info->is_virtual)
2521 struct dwarf2_section_info *containing_section =
2522 get_containing_section (info);
2524 gdb_assert (sectp != NULL);
2525 if ((sectp->flags & SEC_RELOC) != 0)
2527 error (_("Dwarf Error: DWP format V2 with relocations is not"
2528 " supported in section %s [in module %s]"),
2529 get_section_name (info), get_section_file_name (info));
2531 dwarf2_read_section (objfile, containing_section);
2532 /* Other code should have already caught virtual sections that don't
2534 gdb_assert (info->virtual_offset + info->size
2535 <= containing_section->size);
2536 /* If the real section is empty or there was a problem reading the
2537 section we shouldn't get here. */
2538 gdb_assert (containing_section->buffer != NULL);
2539 info->buffer = containing_section->buffer + info->virtual_offset;
2543 /* If the section has relocations, we must read it ourselves.
2544 Otherwise we attach it to the BFD. */
2545 if ((sectp->flags & SEC_RELOC) == 0)
2547 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2551 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2554 /* When debugging .o files, we may need to apply relocations; see
2555 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2556 We never compress sections in .o files, so we only need to
2557 try this when the section is not compressed. */
2558 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2561 info->buffer = retbuf;
2565 abfd = get_section_bfd_owner (info);
2566 gdb_assert (abfd != NULL);
2568 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2569 || bfd_bread (buf, info->size, abfd) != info->size)
2571 error (_("Dwarf Error: Can't read DWARF data"
2572 " in section %s [in module %s]"),
2573 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2577 /* A helper function that returns the size of a section in a safe way.
2578 If you are positive that the section has been read before using the
2579 size, then it is safe to refer to the dwarf2_section_info object's
2580 "size" field directly. In other cases, you must call this
2581 function, because for compressed sections the size field is not set
2582 correctly until the section has been read. */
2584 static bfd_size_type
2585 dwarf2_section_size (struct objfile *objfile,
2586 struct dwarf2_section_info *info)
2589 dwarf2_read_section (objfile, info);
2593 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2597 dwarf2_get_section_info (struct objfile *objfile,
2598 enum dwarf2_section_enum sect,
2599 asection **sectp, const gdb_byte **bufp,
2600 bfd_size_type *sizep)
2602 struct dwarf2_per_objfile *data
2603 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2604 dwarf2_objfile_data_key);
2605 struct dwarf2_section_info *info;
2607 /* We may see an objfile without any DWARF, in which case we just
2618 case DWARF2_DEBUG_FRAME:
2619 info = &data->frame;
2621 case DWARF2_EH_FRAME:
2622 info = &data->eh_frame;
2625 gdb_assert_not_reached ("unexpected section");
2628 dwarf2_read_section (objfile, info);
2630 *sectp = get_section_bfd_section (info);
2631 *bufp = info->buffer;
2632 *sizep = info->size;
2635 /* A helper function to find the sections for a .dwz file. */
2638 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2640 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2642 /* Note that we only support the standard ELF names, because .dwz
2643 is ELF-only (at the time of writing). */
2644 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2646 dwz_file->abbrev.s.section = sectp;
2647 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2649 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2651 dwz_file->info.s.section = sectp;
2652 dwz_file->info.size = bfd_get_section_size (sectp);
2654 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2656 dwz_file->str.s.section = sectp;
2657 dwz_file->str.size = bfd_get_section_size (sectp);
2659 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2661 dwz_file->line.s.section = sectp;
2662 dwz_file->line.size = bfd_get_section_size (sectp);
2664 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2666 dwz_file->macro.s.section = sectp;
2667 dwz_file->macro.size = bfd_get_section_size (sectp);
2669 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2671 dwz_file->gdb_index.s.section = sectp;
2672 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2676 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2677 there is no .gnu_debugaltlink section in the file. Error if there
2678 is such a section but the file cannot be found. */
2680 static struct dwz_file *
2681 dwarf2_get_dwz_file (void)
2684 struct cleanup *cleanup;
2685 const char *filename;
2686 struct dwz_file *result;
2687 bfd_size_type buildid_len_arg;
2691 if (dwarf2_per_objfile->dwz_file != NULL)
2692 return dwarf2_per_objfile->dwz_file;
2694 bfd_set_error (bfd_error_no_error);
2695 data = bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2696 &buildid_len_arg, &buildid);
2699 if (bfd_get_error () == bfd_error_no_error)
2701 error (_("could not read '.gnu_debugaltlink' section: %s"),
2702 bfd_errmsg (bfd_get_error ()));
2704 cleanup = make_cleanup (xfree, data);
2705 make_cleanup (xfree, buildid);
2707 buildid_len = (size_t) buildid_len_arg;
2709 filename = (const char *) data;
2711 std::string abs_storage;
2712 if (!IS_ABSOLUTE_PATH (filename))
2714 char *abs = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2716 make_cleanup (xfree, abs);
2717 abs_storage = ldirname (abs) + SLASH_STRING + filename;
2718 filename = abs_storage.c_str ();
2721 /* First try the file name given in the section. If that doesn't
2722 work, try to use the build-id instead. */
2723 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2724 if (dwz_bfd != NULL)
2726 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2730 if (dwz_bfd == NULL)
2731 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2733 if (dwz_bfd == NULL)
2734 error (_("could not find '.gnu_debugaltlink' file for %s"),
2735 objfile_name (dwarf2_per_objfile->objfile));
2737 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2739 result->dwz_bfd = dwz_bfd.release ();
2741 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
2743 do_cleanups (cleanup);
2745 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
2746 dwarf2_per_objfile->dwz_file = result;
2750 /* DWARF quick_symbols_functions support. */
2752 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2753 unique line tables, so we maintain a separate table of all .debug_line
2754 derived entries to support the sharing.
2755 All the quick functions need is the list of file names. We discard the
2756 line_header when we're done and don't need to record it here. */
2757 struct quick_file_names
2759 /* The data used to construct the hash key. */
2760 struct stmt_list_hash hash;
2762 /* The number of entries in file_names, real_names. */
2763 unsigned int num_file_names;
2765 /* The file names from the line table, after being run through
2767 const char **file_names;
2769 /* The file names from the line table after being run through
2770 gdb_realpath. These are computed lazily. */
2771 const char **real_names;
2774 /* When using the index (and thus not using psymtabs), each CU has an
2775 object of this type. This is used to hold information needed by
2776 the various "quick" methods. */
2777 struct dwarf2_per_cu_quick_data
2779 /* The file table. This can be NULL if there was no file table
2780 or it's currently not read in.
2781 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2782 struct quick_file_names *file_names;
2784 /* The corresponding symbol table. This is NULL if symbols for this
2785 CU have not yet been read. */
2786 struct compunit_symtab *compunit_symtab;
2788 /* A temporary mark bit used when iterating over all CUs in
2789 expand_symtabs_matching. */
2790 unsigned int mark : 1;
2792 /* True if we've tried to read the file table and found there isn't one.
2793 There will be no point in trying to read it again next time. */
2794 unsigned int no_file_data : 1;
2797 /* Utility hash function for a stmt_list_hash. */
2800 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2804 if (stmt_list_hash->dwo_unit != NULL)
2805 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2806 v += to_underlying (stmt_list_hash->line_sect_off);
2810 /* Utility equality function for a stmt_list_hash. */
2813 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2814 const struct stmt_list_hash *rhs)
2816 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2818 if (lhs->dwo_unit != NULL
2819 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2822 return lhs->line_sect_off == rhs->line_sect_off;
2825 /* Hash function for a quick_file_names. */
2828 hash_file_name_entry (const void *e)
2830 const struct quick_file_names *file_data
2831 = (const struct quick_file_names *) e;
2833 return hash_stmt_list_entry (&file_data->hash);
2836 /* Equality function for a quick_file_names. */
2839 eq_file_name_entry (const void *a, const void *b)
2841 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2842 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2844 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2847 /* Delete function for a quick_file_names. */
2850 delete_file_name_entry (void *e)
2852 struct quick_file_names *file_data = (struct quick_file_names *) e;
2855 for (i = 0; i < file_data->num_file_names; ++i)
2857 xfree ((void*) file_data->file_names[i]);
2858 if (file_data->real_names)
2859 xfree ((void*) file_data->real_names[i]);
2862 /* The space for the struct itself lives on objfile_obstack,
2863 so we don't free it here. */
2866 /* Create a quick_file_names hash table. */
2869 create_quick_file_names_table (unsigned int nr_initial_entries)
2871 return htab_create_alloc (nr_initial_entries,
2872 hash_file_name_entry, eq_file_name_entry,
2873 delete_file_name_entry, xcalloc, xfree);
2876 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2877 have to be created afterwards. You should call age_cached_comp_units after
2878 processing PER_CU->CU. dw2_setup must have been already called. */
2881 load_cu (struct dwarf2_per_cu_data *per_cu)
2883 if (per_cu->is_debug_types)
2884 load_full_type_unit (per_cu);
2886 load_full_comp_unit (per_cu, language_minimal);
2888 if (per_cu->cu == NULL)
2889 return; /* Dummy CU. */
2891 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2894 /* Read in the symbols for PER_CU. */
2897 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2899 struct cleanup *back_to;
2901 /* Skip type_unit_groups, reading the type units they contain
2902 is handled elsewhere. */
2903 if (IS_TYPE_UNIT_GROUP (per_cu))
2906 back_to = make_cleanup (dwarf2_release_queue, NULL);
2908 if (dwarf2_per_objfile->using_index
2909 ? per_cu->v.quick->compunit_symtab == NULL
2910 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2912 queue_comp_unit (per_cu, language_minimal);
2915 /* If we just loaded a CU from a DWO, and we're working with an index
2916 that may badly handle TUs, load all the TUs in that DWO as well.
2917 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2918 if (!per_cu->is_debug_types
2919 && per_cu->cu != NULL
2920 && per_cu->cu->dwo_unit != NULL
2921 && dwarf2_per_objfile->index_table != NULL
2922 && dwarf2_per_objfile->index_table->version <= 7
2923 /* DWP files aren't supported yet. */
2924 && get_dwp_file () == NULL)
2925 queue_and_load_all_dwo_tus (per_cu);
2930 /* Age the cache, releasing compilation units that have not
2931 been used recently. */
2932 age_cached_comp_units ();
2934 do_cleanups (back_to);
2937 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2938 the objfile from which this CU came. Returns the resulting symbol
2941 static struct compunit_symtab *
2942 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2944 gdb_assert (dwarf2_per_objfile->using_index);
2945 if (!per_cu->v.quick->compunit_symtab)
2947 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2948 scoped_restore decrementer = increment_reading_symtab ();
2949 dw2_do_instantiate_symtab (per_cu);
2950 process_cu_includes ();
2951 do_cleanups (back_to);
2954 return per_cu->v.quick->compunit_symtab;
2957 /* Return the CU/TU given its index.
2959 This is intended for loops like:
2961 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2962 + dwarf2_per_objfile->n_type_units); ++i)
2964 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
2970 static struct dwarf2_per_cu_data *
2971 dw2_get_cutu (int index)
2973 if (index >= dwarf2_per_objfile->n_comp_units)
2975 index -= dwarf2_per_objfile->n_comp_units;
2976 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2977 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2980 return dwarf2_per_objfile->all_comp_units[index];
2983 /* Return the CU given its index.
2984 This differs from dw2_get_cutu in that it's for when you know INDEX
2987 static struct dwarf2_per_cu_data *
2988 dw2_get_cu (int index)
2990 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
2992 return dwarf2_per_objfile->all_comp_units[index];
2995 /* A helper for create_cus_from_index that handles a given list of
2999 create_cus_from_index_list (struct objfile *objfile,
3000 const gdb_byte *cu_list, offset_type n_elements,
3001 struct dwarf2_section_info *section,
3007 for (i = 0; i < n_elements; i += 2)
3009 gdb_static_assert (sizeof (ULONGEST) >= 8);
3011 sect_offset sect_off
3012 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
3013 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3016 dwarf2_per_cu_data *the_cu
3017 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3018 struct dwarf2_per_cu_data);
3019 the_cu->sect_off = sect_off;
3020 the_cu->length = length;
3021 the_cu->objfile = objfile;
3022 the_cu->section = section;
3023 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3024 struct dwarf2_per_cu_quick_data);
3025 the_cu->is_dwz = is_dwz;
3026 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
3030 /* Read the CU list from the mapped index, and use it to create all
3031 the CU objects for this objfile. */
3034 create_cus_from_index (struct objfile *objfile,
3035 const gdb_byte *cu_list, offset_type cu_list_elements,
3036 const gdb_byte *dwz_list, offset_type dwz_elements)
3038 struct dwz_file *dwz;
3040 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
3041 dwarf2_per_objfile->all_comp_units =
3042 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
3043 dwarf2_per_objfile->n_comp_units);
3045 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
3046 &dwarf2_per_objfile->info, 0, 0);
3048 if (dwz_elements == 0)
3051 dwz = dwarf2_get_dwz_file ();
3052 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
3053 cu_list_elements / 2);
3056 /* Create the signatured type hash table from the index. */
3059 create_signatured_type_table_from_index (struct objfile *objfile,
3060 struct dwarf2_section_info *section,
3061 const gdb_byte *bytes,
3062 offset_type elements)
3065 htab_t sig_types_hash;
3067 dwarf2_per_objfile->n_type_units
3068 = dwarf2_per_objfile->n_allocated_type_units
3070 dwarf2_per_objfile->all_type_units =
3071 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3073 sig_types_hash = allocate_signatured_type_table (objfile);
3075 for (i = 0; i < elements; i += 3)
3077 struct signatured_type *sig_type;
3080 cu_offset type_offset_in_tu;
3082 gdb_static_assert (sizeof (ULONGEST) >= 8);
3083 sect_offset sect_off
3084 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3086 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3088 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3091 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3092 struct signatured_type);
3093 sig_type->signature = signature;
3094 sig_type->type_offset_in_tu = type_offset_in_tu;
3095 sig_type->per_cu.is_debug_types = 1;
3096 sig_type->per_cu.section = section;
3097 sig_type->per_cu.sect_off = sect_off;
3098 sig_type->per_cu.objfile = objfile;
3099 sig_type->per_cu.v.quick
3100 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3101 struct dwarf2_per_cu_quick_data);
3103 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3106 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
3109 dwarf2_per_objfile->signatured_types = sig_types_hash;
3112 /* Read the address map data from the mapped index, and use it to
3113 populate the objfile's psymtabs_addrmap. */
3116 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
3118 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3119 const gdb_byte *iter, *end;
3120 struct addrmap *mutable_map;
3123 auto_obstack temp_obstack;
3125 mutable_map = addrmap_create_mutable (&temp_obstack);
3127 iter = index->address_table;
3128 end = iter + index->address_table_size;
3130 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3134 ULONGEST hi, lo, cu_index;
3135 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3137 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3139 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3144 complaint (&symfile_complaints,
3145 _(".gdb_index address table has invalid range (%s - %s)"),
3146 hex_string (lo), hex_string (hi));
3150 if (cu_index >= dwarf2_per_objfile->n_comp_units)
3152 complaint (&symfile_complaints,
3153 _(".gdb_index address table has invalid CU number %u"),
3154 (unsigned) cu_index);
3158 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3159 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3160 addrmap_set_empty (mutable_map, lo, hi - 1, dw2_get_cutu (cu_index));
3163 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3164 &objfile->objfile_obstack);
3167 /* The hash function for strings in the mapped index. This is the same as
3168 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
3169 implementation. This is necessary because the hash function is tied to the
3170 format of the mapped index file. The hash values do not have to match with
3173 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
3176 mapped_index_string_hash (int index_version, const void *p)
3178 const unsigned char *str = (const unsigned char *) p;
3182 while ((c = *str++) != 0)
3184 if (index_version >= 5)
3186 r = r * 67 + c - 113;
3192 /* Find a slot in the mapped index INDEX for the object named NAME.
3193 If NAME is found, set *VEC_OUT to point to the CU vector in the
3194 constant pool and return 1. If NAME cannot be found, return 0. */
3197 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3198 offset_type **vec_out)
3200 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
3202 offset_type slot, step;
3203 int (*cmp) (const char *, const char *);
3205 if (current_language->la_language == language_cplus
3206 || current_language->la_language == language_fortran
3207 || current_language->la_language == language_d)
3209 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3212 if (strchr (name, '(') != NULL)
3214 char *without_params = cp_remove_params (name);
3216 if (without_params != NULL)
3218 make_cleanup (xfree, without_params);
3219 name = without_params;
3224 /* Index version 4 did not support case insensitive searches. But the
3225 indices for case insensitive languages are built in lowercase, therefore
3226 simulate our NAME being searched is also lowercased. */
3227 hash = mapped_index_string_hash ((index->version == 4
3228 && case_sensitivity == case_sensitive_off
3229 ? 5 : index->version),
3232 slot = hash & (index->symbol_table_slots - 1);
3233 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
3234 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3238 /* Convert a slot number to an offset into the table. */
3239 offset_type i = 2 * slot;
3241 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
3243 do_cleanups (back_to);
3247 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
3248 if (!cmp (name, str))
3250 *vec_out = (offset_type *) (index->constant_pool
3251 + MAYBE_SWAP (index->symbol_table[i + 1]));
3252 do_cleanups (back_to);
3256 slot = (slot + step) & (index->symbol_table_slots - 1);
3260 /* A helper function that reads the .gdb_index from SECTION and fills
3261 in MAP. FILENAME is the name of the file containing the section;
3262 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3263 ok to use deprecated sections.
3265 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3266 out parameters that are filled in with information about the CU and
3267 TU lists in the section.
3269 Returns 1 if all went well, 0 otherwise. */
3272 read_index_from_section (struct objfile *objfile,
3273 const char *filename,
3275 struct dwarf2_section_info *section,
3276 struct mapped_index *map,
3277 const gdb_byte **cu_list,
3278 offset_type *cu_list_elements,
3279 const gdb_byte **types_list,
3280 offset_type *types_list_elements)
3282 const gdb_byte *addr;
3283 offset_type version;
3284 offset_type *metadata;
3287 if (dwarf2_section_empty_p (section))
3290 /* Older elfutils strip versions could keep the section in the main
3291 executable while splitting it for the separate debug info file. */
3292 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3295 dwarf2_read_section (objfile, section);
3297 addr = section->buffer;
3298 /* Version check. */
3299 version = MAYBE_SWAP (*(offset_type *) addr);
3300 /* Versions earlier than 3 emitted every copy of a psymbol. This
3301 causes the index to behave very poorly for certain requests. Version 3
3302 contained incomplete addrmap. So, it seems better to just ignore such
3306 static int warning_printed = 0;
3307 if (!warning_printed)
3309 warning (_("Skipping obsolete .gdb_index section in %s."),
3311 warning_printed = 1;
3315 /* Index version 4 uses a different hash function than index version
3318 Versions earlier than 6 did not emit psymbols for inlined
3319 functions. Using these files will cause GDB not to be able to
3320 set breakpoints on inlined functions by name, so we ignore these
3321 indices unless the user has done
3322 "set use-deprecated-index-sections on". */
3323 if (version < 6 && !deprecated_ok)
3325 static int warning_printed = 0;
3326 if (!warning_printed)
3329 Skipping deprecated .gdb_index section in %s.\n\
3330 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3331 to use the section anyway."),
3333 warning_printed = 1;
3337 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3338 of the TU (for symbols coming from TUs),
3339 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3340 Plus gold-generated indices can have duplicate entries for global symbols,
3341 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3342 These are just performance bugs, and we can't distinguish gdb-generated
3343 indices from gold-generated ones, so issue no warning here. */
3345 /* Indexes with higher version than the one supported by GDB may be no
3346 longer backward compatible. */
3350 map->version = version;
3351 map->total_size = section->size;
3353 metadata = (offset_type *) (addr + sizeof (offset_type));
3356 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3357 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3361 *types_list = addr + MAYBE_SWAP (metadata[i]);
3362 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3363 - MAYBE_SWAP (metadata[i]))
3367 map->address_table = addr + MAYBE_SWAP (metadata[i]);
3368 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
3369 - MAYBE_SWAP (metadata[i]));
3372 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
3373 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
3374 - MAYBE_SWAP (metadata[i]))
3375 / (2 * sizeof (offset_type)));
3378 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3384 /* Read the index file. If everything went ok, initialize the "quick"
3385 elements of all the CUs and return 1. Otherwise, return 0. */
3388 dwarf2_read_index (struct objfile *objfile)
3390 struct mapped_index local_map, *map;
3391 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3392 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3393 struct dwz_file *dwz;
3395 if (!read_index_from_section (objfile, objfile_name (objfile),
3396 use_deprecated_index_sections,
3397 &dwarf2_per_objfile->gdb_index, &local_map,
3398 &cu_list, &cu_list_elements,
3399 &types_list, &types_list_elements))
3402 /* Don't use the index if it's empty. */
3403 if (local_map.symbol_table_slots == 0)
3406 /* If there is a .dwz file, read it so we can get its CU list as
3408 dwz = dwarf2_get_dwz_file ();
3411 struct mapped_index dwz_map;
3412 const gdb_byte *dwz_types_ignore;
3413 offset_type dwz_types_elements_ignore;
3415 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3417 &dwz->gdb_index, &dwz_map,
3418 &dwz_list, &dwz_list_elements,
3420 &dwz_types_elements_ignore))
3422 warning (_("could not read '.gdb_index' section from %s; skipping"),
3423 bfd_get_filename (dwz->dwz_bfd));
3428 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3431 if (types_list_elements)
3433 struct dwarf2_section_info *section;
3435 /* We can only handle a single .debug_types when we have an
3437 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3440 section = VEC_index (dwarf2_section_info_def,
3441 dwarf2_per_objfile->types, 0);
3443 create_signatured_type_table_from_index (objfile, section, types_list,
3444 types_list_elements);
3447 create_addrmap_from_index (objfile, &local_map);
3449 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
3452 dwarf2_per_objfile->index_table = map;
3453 dwarf2_per_objfile->using_index = 1;
3454 dwarf2_per_objfile->quick_file_names_table =
3455 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3460 /* A helper for the "quick" functions which sets the global
3461 dwarf2_per_objfile according to OBJFILE. */
3464 dw2_setup (struct objfile *objfile)
3466 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
3467 objfile_data (objfile, dwarf2_objfile_data_key));
3468 gdb_assert (dwarf2_per_objfile);
3471 /* die_reader_func for dw2_get_file_names. */
3474 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3475 const gdb_byte *info_ptr,
3476 struct die_info *comp_unit_die,
3480 struct dwarf2_cu *cu = reader->cu;
3481 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3482 struct objfile *objfile = dwarf2_per_objfile->objfile;
3483 struct dwarf2_per_cu_data *lh_cu;
3484 struct attribute *attr;
3487 struct quick_file_names *qfn;
3489 gdb_assert (! this_cu->is_debug_types);
3491 /* Our callers never want to match partial units -- instead they
3492 will match the enclosing full CU. */
3493 if (comp_unit_die->tag == DW_TAG_partial_unit)
3495 this_cu->v.quick->no_file_data = 1;
3503 sect_offset line_offset {};
3505 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3508 struct quick_file_names find_entry;
3510 line_offset = (sect_offset) DW_UNSND (attr);
3512 /* We may have already read in this line header (TU line header sharing).
3513 If we have we're done. */
3514 find_entry.hash.dwo_unit = cu->dwo_unit;
3515 find_entry.hash.line_sect_off = line_offset;
3516 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3517 &find_entry, INSERT);
3520 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3524 lh = dwarf_decode_line_header (line_offset, cu);
3528 lh_cu->v.quick->no_file_data = 1;
3532 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3533 qfn->hash.dwo_unit = cu->dwo_unit;
3534 qfn->hash.line_sect_off = line_offset;
3535 gdb_assert (slot != NULL);
3538 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3540 qfn->num_file_names = lh->file_names.size ();
3542 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3543 for (i = 0; i < lh->file_names.size (); ++i)
3544 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3545 qfn->real_names = NULL;
3547 lh_cu->v.quick->file_names = qfn;
3550 /* A helper for the "quick" functions which attempts to read the line
3551 table for THIS_CU. */
3553 static struct quick_file_names *
3554 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3556 /* This should never be called for TUs. */
3557 gdb_assert (! this_cu->is_debug_types);
3558 /* Nor type unit groups. */
3559 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3561 if (this_cu->v.quick->file_names != NULL)
3562 return this_cu->v.quick->file_names;
3563 /* If we know there is no line data, no point in looking again. */
3564 if (this_cu->v.quick->no_file_data)
3567 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3569 if (this_cu->v.quick->no_file_data)
3571 return this_cu->v.quick->file_names;
3574 /* A helper for the "quick" functions which computes and caches the
3575 real path for a given file name from the line table. */
3578 dw2_get_real_path (struct objfile *objfile,
3579 struct quick_file_names *qfn, int index)
3581 if (qfn->real_names == NULL)
3582 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3583 qfn->num_file_names, const char *);
3585 if (qfn->real_names[index] == NULL)
3586 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]);
3588 return qfn->real_names[index];
3591 static struct symtab *
3592 dw2_find_last_source_symtab (struct objfile *objfile)
3594 struct compunit_symtab *cust;
3597 dw2_setup (objfile);
3598 index = dwarf2_per_objfile->n_comp_units - 1;
3599 cust = dw2_instantiate_symtab (dw2_get_cutu (index));
3602 return compunit_primary_filetab (cust);
3605 /* Traversal function for dw2_forget_cached_source_info. */
3608 dw2_free_cached_file_names (void **slot, void *info)
3610 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3612 if (file_data->real_names)
3616 for (i = 0; i < file_data->num_file_names; ++i)
3618 xfree ((void*) file_data->real_names[i]);
3619 file_data->real_names[i] = NULL;
3627 dw2_forget_cached_source_info (struct objfile *objfile)
3629 dw2_setup (objfile);
3631 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3632 dw2_free_cached_file_names, NULL);
3635 /* Helper function for dw2_map_symtabs_matching_filename that expands
3636 the symtabs and calls the iterator. */
3639 dw2_map_expand_apply (struct objfile *objfile,
3640 struct dwarf2_per_cu_data *per_cu,
3641 const char *name, const char *real_path,
3642 gdb::function_view<bool (symtab *)> callback)
3644 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3646 /* Don't visit already-expanded CUs. */
3647 if (per_cu->v.quick->compunit_symtab)
3650 /* This may expand more than one symtab, and we want to iterate over
3652 dw2_instantiate_symtab (per_cu);
3654 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3655 last_made, callback);
3658 /* Implementation of the map_symtabs_matching_filename method. */
3661 dw2_map_symtabs_matching_filename
3662 (struct objfile *objfile, const char *name, const char *real_path,
3663 gdb::function_view<bool (symtab *)> callback)
3666 const char *name_basename = lbasename (name);
3668 dw2_setup (objfile);
3670 /* The rule is CUs specify all the files, including those used by
3671 any TU, so there's no need to scan TUs here. */
3673 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3676 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3677 struct quick_file_names *file_data;
3679 /* We only need to look at symtabs not already expanded. */
3680 if (per_cu->v.quick->compunit_symtab)
3683 file_data = dw2_get_file_names (per_cu);
3684 if (file_data == NULL)
3687 for (j = 0; j < file_data->num_file_names; ++j)
3689 const char *this_name = file_data->file_names[j];
3690 const char *this_real_name;
3692 if (compare_filenames_for_search (this_name, name))
3694 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3700 /* Before we invoke realpath, which can get expensive when many
3701 files are involved, do a quick comparison of the basenames. */
3702 if (! basenames_may_differ
3703 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3706 this_real_name = dw2_get_real_path (objfile, file_data, j);
3707 if (compare_filenames_for_search (this_real_name, name))
3709 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3715 if (real_path != NULL)
3717 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3718 gdb_assert (IS_ABSOLUTE_PATH (name));
3719 if (this_real_name != NULL
3720 && FILENAME_CMP (real_path, this_real_name) == 0)
3722 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3734 /* Struct used to manage iterating over all CUs looking for a symbol. */
3736 struct dw2_symtab_iterator
3738 /* The internalized form of .gdb_index. */
3739 struct mapped_index *index;
3740 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3741 int want_specific_block;
3742 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3743 Unused if !WANT_SPECIFIC_BLOCK. */
3745 /* The kind of symbol we're looking for. */
3747 /* The list of CUs from the index entry of the symbol,
3748 or NULL if not found. */
3750 /* The next element in VEC to look at. */
3752 /* The number of elements in VEC, or zero if there is no match. */
3754 /* Have we seen a global version of the symbol?
3755 If so we can ignore all further global instances.
3756 This is to work around gold/15646, inefficient gold-generated
3761 /* Initialize the index symtab iterator ITER.
3762 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3763 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3766 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3767 struct mapped_index *index,
3768 int want_specific_block,
3773 iter->index = index;
3774 iter->want_specific_block = want_specific_block;
3775 iter->block_index = block_index;
3776 iter->domain = domain;
3778 iter->global_seen = 0;
3780 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3781 iter->length = MAYBE_SWAP (*iter->vec);
3789 /* Return the next matching CU or NULL if there are no more. */
3791 static struct dwarf2_per_cu_data *
3792 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3794 for ( ; iter->next < iter->length; ++iter->next)
3796 offset_type cu_index_and_attrs =
3797 MAYBE_SWAP (iter->vec[iter->next + 1]);
3798 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3799 struct dwarf2_per_cu_data *per_cu;
3800 int want_static = iter->block_index != GLOBAL_BLOCK;
3801 /* This value is only valid for index versions >= 7. */
3802 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3803 gdb_index_symbol_kind symbol_kind =
3804 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3805 /* Only check the symbol attributes if they're present.
3806 Indices prior to version 7 don't record them,
3807 and indices >= 7 may elide them for certain symbols
3808 (gold does this). */
3810 (iter->index->version >= 7
3811 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3813 /* Don't crash on bad data. */
3814 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3815 + dwarf2_per_objfile->n_type_units))
3817 complaint (&symfile_complaints,
3818 _(".gdb_index entry has bad CU index"
3820 objfile_name (dwarf2_per_objfile->objfile));
3824 per_cu = dw2_get_cutu (cu_index);
3826 /* Skip if already read in. */
3827 if (per_cu->v.quick->compunit_symtab)
3830 /* Check static vs global. */
3833 if (iter->want_specific_block
3834 && want_static != is_static)
3836 /* Work around gold/15646. */
3837 if (!is_static && iter->global_seen)
3840 iter->global_seen = 1;
3843 /* Only check the symbol's kind if it has one. */
3846 switch (iter->domain)
3849 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3850 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3851 /* Some types are also in VAR_DOMAIN. */
3852 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3856 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3860 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3875 static struct compunit_symtab *
3876 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3877 const char *name, domain_enum domain)
3879 struct compunit_symtab *stab_best = NULL;
3880 struct mapped_index *index;
3882 dw2_setup (objfile);
3884 index = dwarf2_per_objfile->index_table;
3886 /* index is NULL if OBJF_READNOW. */
3889 struct dw2_symtab_iterator iter;
3890 struct dwarf2_per_cu_data *per_cu;
3892 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3894 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3896 struct symbol *sym, *with_opaque = NULL;
3897 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
3898 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
3899 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3901 sym = block_find_symbol (block, name, domain,
3902 block_find_non_opaque_type_preferred,
3905 /* Some caution must be observed with overloaded functions
3906 and methods, since the index will not contain any overload
3907 information (but NAME might contain it). */
3910 && SYMBOL_MATCHES_SEARCH_NAME (sym, name))
3912 if (with_opaque != NULL
3913 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, name))
3916 /* Keep looking through other CUs. */
3924 dw2_print_stats (struct objfile *objfile)
3926 int i, total, count;
3928 dw2_setup (objfile);
3929 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3931 for (i = 0; i < total; ++i)
3933 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3935 if (!per_cu->v.quick->compunit_symtab)
3938 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3939 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3942 /* This dumps minimal information about the index.
3943 It is called via "mt print objfiles".
3944 One use is to verify .gdb_index has been loaded by the
3945 gdb.dwarf2/gdb-index.exp testcase. */
3948 dw2_dump (struct objfile *objfile)
3950 dw2_setup (objfile);
3951 gdb_assert (dwarf2_per_objfile->using_index);
3952 printf_filtered (".gdb_index:");
3953 if (dwarf2_per_objfile->index_table != NULL)
3955 printf_filtered (" version %d\n",
3956 dwarf2_per_objfile->index_table->version);
3959 printf_filtered (" faked for \"readnow\"\n");
3960 printf_filtered ("\n");
3964 dw2_relocate (struct objfile *objfile,
3965 const struct section_offsets *new_offsets,
3966 const struct section_offsets *delta)
3968 /* There's nothing to relocate here. */
3972 dw2_expand_symtabs_for_function (struct objfile *objfile,
3973 const char *func_name)
3975 struct mapped_index *index;
3977 dw2_setup (objfile);
3979 index = dwarf2_per_objfile->index_table;
3981 /* index is NULL if OBJF_READNOW. */
3984 struct dw2_symtab_iterator iter;
3985 struct dwarf2_per_cu_data *per_cu;
3987 /* Note: It doesn't matter what we pass for block_index here. */
3988 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3991 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3992 dw2_instantiate_symtab (per_cu);
3997 dw2_expand_all_symtabs (struct objfile *objfile)
4001 dw2_setup (objfile);
4003 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4004 + dwarf2_per_objfile->n_type_units); ++i)
4006 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4008 dw2_instantiate_symtab (per_cu);
4013 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4014 const char *fullname)
4018 dw2_setup (objfile);
4020 /* We don't need to consider type units here.
4021 This is only called for examining code, e.g. expand_line_sal.
4022 There can be an order of magnitude (or more) more type units
4023 than comp units, and we avoid them if we can. */
4025 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4028 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4029 struct quick_file_names *file_data;
4031 /* We only need to look at symtabs not already expanded. */
4032 if (per_cu->v.quick->compunit_symtab)
4035 file_data = dw2_get_file_names (per_cu);
4036 if (file_data == NULL)
4039 for (j = 0; j < file_data->num_file_names; ++j)
4041 const char *this_fullname = file_data->file_names[j];
4043 if (filename_cmp (this_fullname, fullname) == 0)
4045 dw2_instantiate_symtab (per_cu);
4053 dw2_map_matching_symbols (struct objfile *objfile,
4054 const char * name, domain_enum domain,
4056 int (*callback) (struct block *,
4057 struct symbol *, void *),
4058 void *data, symbol_compare_ftype *match,
4059 symbol_compare_ftype *ordered_compare)
4061 /* Currently unimplemented; used for Ada. The function can be called if the
4062 current language is Ada for a non-Ada objfile using GNU index. As Ada
4063 does not look for non-Ada symbols this function should just return. */
4067 dw2_expand_symtabs_matching
4068 (struct objfile *objfile,
4069 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
4070 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4071 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
4072 enum search_domain kind)
4076 struct mapped_index *index;
4078 dw2_setup (objfile);
4080 /* index_table is NULL if OBJF_READNOW. */
4081 if (!dwarf2_per_objfile->index_table)
4083 index = dwarf2_per_objfile->index_table;
4085 if (file_matcher != NULL)
4087 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
4089 NULL, xcalloc, xfree));
4090 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
4092 NULL, xcalloc, xfree));
4094 /* The rule is CUs specify all the files, including those used by
4095 any TU, so there's no need to scan TUs here. */
4097 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4100 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4101 struct quick_file_names *file_data;
4106 per_cu->v.quick->mark = 0;
4108 /* We only need to look at symtabs not already expanded. */
4109 if (per_cu->v.quick->compunit_symtab)
4112 file_data = dw2_get_file_names (per_cu);
4113 if (file_data == NULL)
4116 if (htab_find (visited_not_found.get (), file_data) != NULL)
4118 else if (htab_find (visited_found.get (), file_data) != NULL)
4120 per_cu->v.quick->mark = 1;
4124 for (j = 0; j < file_data->num_file_names; ++j)
4126 const char *this_real_name;
4128 if (file_matcher (file_data->file_names[j], false))
4130 per_cu->v.quick->mark = 1;
4134 /* Before we invoke realpath, which can get expensive when many
4135 files are involved, do a quick comparison of the basenames. */
4136 if (!basenames_may_differ
4137 && !file_matcher (lbasename (file_data->file_names[j]),
4141 this_real_name = dw2_get_real_path (objfile, file_data, j);
4142 if (file_matcher (this_real_name, false))
4144 per_cu->v.quick->mark = 1;
4149 slot = htab_find_slot (per_cu->v.quick->mark
4150 ? visited_found.get ()
4151 : visited_not_found.get (),
4157 for (iter = 0; iter < index->symbol_table_slots; ++iter)
4159 offset_type idx = 2 * iter;
4161 offset_type *vec, vec_len, vec_idx;
4162 int global_seen = 0;
4166 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
4169 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
4171 if (!symbol_matcher (name))
4174 /* The name was matched, now expand corresponding CUs that were
4176 vec = (offset_type *) (index->constant_pool
4177 + MAYBE_SWAP (index->symbol_table[idx + 1]));
4178 vec_len = MAYBE_SWAP (vec[0]);
4179 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
4181 struct dwarf2_per_cu_data *per_cu;
4182 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
4183 /* This value is only valid for index versions >= 7. */
4184 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
4185 gdb_index_symbol_kind symbol_kind =
4186 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
4187 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
4188 /* Only check the symbol attributes if they're present.
4189 Indices prior to version 7 don't record them,
4190 and indices >= 7 may elide them for certain symbols
4191 (gold does this). */
4193 (index->version >= 7
4194 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4196 /* Work around gold/15646. */
4199 if (!is_static && global_seen)
4205 /* Only check the symbol's kind if it has one. */
4210 case VARIABLES_DOMAIN:
4211 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
4214 case FUNCTIONS_DOMAIN:
4215 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
4219 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4227 /* Don't crash on bad data. */
4228 if (cu_index >= (dwarf2_per_objfile->n_comp_units
4229 + dwarf2_per_objfile->n_type_units))
4231 complaint (&symfile_complaints,
4232 _(".gdb_index entry has bad CU index"
4233 " [in module %s]"), objfile_name (objfile));
4237 per_cu = dw2_get_cutu (cu_index);
4238 if (file_matcher == NULL || per_cu->v.quick->mark)
4240 int symtab_was_null =
4241 (per_cu->v.quick->compunit_symtab == NULL);
4243 dw2_instantiate_symtab (per_cu);
4245 if (expansion_notify != NULL
4247 && per_cu->v.quick->compunit_symtab != NULL)
4249 expansion_notify (per_cu->v.quick->compunit_symtab);
4256 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
4259 static struct compunit_symtab *
4260 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
4265 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
4266 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
4269 if (cust->includes == NULL)
4272 for (i = 0; cust->includes[i]; ++i)
4274 struct compunit_symtab *s = cust->includes[i];
4276 s = recursively_find_pc_sect_compunit_symtab (s, pc);
4284 static struct compunit_symtab *
4285 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
4286 struct bound_minimal_symbol msymbol,
4288 struct obj_section *section,
4291 struct dwarf2_per_cu_data *data;
4292 struct compunit_symtab *result;
4294 dw2_setup (objfile);
4296 if (!objfile->psymtabs_addrmap)
4299 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
4304 if (warn_if_readin && data->v.quick->compunit_symtab)
4305 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
4306 paddress (get_objfile_arch (objfile), pc));
4309 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
4311 gdb_assert (result != NULL);
4316 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
4317 void *data, int need_fullname)
4319 dw2_setup (objfile);
4321 if (!dwarf2_per_objfile->filenames_cache)
4323 dwarf2_per_objfile->filenames_cache.emplace ();
4325 htab_up visited (htab_create_alloc (10,
4326 htab_hash_pointer, htab_eq_pointer,
4327 NULL, xcalloc, xfree));
4329 /* The rule is CUs specify all the files, including those used
4330 by any TU, so there's no need to scan TUs here. We can
4331 ignore file names coming from already-expanded CUs. */
4333 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4335 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4337 if (per_cu->v.quick->compunit_symtab)
4339 void **slot = htab_find_slot (visited.get (),
4340 per_cu->v.quick->file_names,
4343 *slot = per_cu->v.quick->file_names;
4347 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4350 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4351 struct quick_file_names *file_data;
4354 /* We only need to look at symtabs not already expanded. */
4355 if (per_cu->v.quick->compunit_symtab)
4358 file_data = dw2_get_file_names (per_cu);
4359 if (file_data == NULL)
4362 slot = htab_find_slot (visited.get (), file_data, INSERT);
4365 /* Already visited. */
4370 for (int j = 0; j < file_data->num_file_names; ++j)
4372 const char *filename = file_data->file_names[j];
4373 dwarf2_per_objfile->filenames_cache->seen (filename);
4378 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
4380 const char *this_real_name;
4383 this_real_name = gdb_realpath (filename);
4385 this_real_name = NULL;
4386 (*fun) (filename, this_real_name, data);
4391 dw2_has_symbols (struct objfile *objfile)
4396 const struct quick_symbol_functions dwarf2_gdb_index_functions =
4399 dw2_find_last_source_symtab,
4400 dw2_forget_cached_source_info,
4401 dw2_map_symtabs_matching_filename,
4406 dw2_expand_symtabs_for_function,
4407 dw2_expand_all_symtabs,
4408 dw2_expand_symtabs_with_fullname,
4409 dw2_map_matching_symbols,
4410 dw2_expand_symtabs_matching,
4411 dw2_find_pc_sect_compunit_symtab,
4412 dw2_map_symbol_filenames
4415 /* Initialize for reading DWARF for this objfile. Return 0 if this
4416 file will use psymtabs, or 1 if using the GNU index. */
4419 dwarf2_initialize_objfile (struct objfile *objfile)
4421 /* If we're about to read full symbols, don't bother with the
4422 indices. In this case we also don't care if some other debug
4423 format is making psymtabs, because they are all about to be
4425 if ((objfile->flags & OBJF_READNOW))
4429 dwarf2_per_objfile->using_index = 1;
4430 create_all_comp_units (objfile);
4431 create_all_type_units (objfile);
4432 dwarf2_per_objfile->quick_file_names_table =
4433 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
4435 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4436 + dwarf2_per_objfile->n_type_units); ++i)
4438 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4440 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4441 struct dwarf2_per_cu_quick_data);
4444 /* Return 1 so that gdb sees the "quick" functions. However,
4445 these functions will be no-ops because we will have expanded
4450 if (dwarf2_read_index (objfile))
4458 /* Build a partial symbol table. */
4461 dwarf2_build_psymtabs (struct objfile *objfile)
4464 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
4466 init_psymbol_list (objfile, 1024);
4471 /* This isn't really ideal: all the data we allocate on the
4472 objfile's obstack is still uselessly kept around. However,
4473 freeing it seems unsafe. */
4474 psymtab_discarder psymtabs (objfile);
4475 dwarf2_build_psymtabs_hard (objfile);
4478 CATCH (except, RETURN_MASK_ERROR)
4480 exception_print (gdb_stderr, except);
4485 /* Return the total length of the CU described by HEADER. */
4488 get_cu_length (const struct comp_unit_head *header)
4490 return header->initial_length_size + header->length;
4493 /* Return TRUE if SECT_OFF is within CU_HEADER. */
4496 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
4498 sect_offset bottom = cu_header->sect_off;
4499 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
4501 return sect_off >= bottom && sect_off < top;
4504 /* Find the base address of the compilation unit for range lists and
4505 location lists. It will normally be specified by DW_AT_low_pc.
4506 In DWARF-3 draft 4, the base address could be overridden by
4507 DW_AT_entry_pc. It's been removed, but GCC still uses this for
4508 compilation units with discontinuous ranges. */
4511 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
4513 struct attribute *attr;
4516 cu->base_address = 0;
4518 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
4521 cu->base_address = attr_value_as_address (attr);
4526 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
4529 cu->base_address = attr_value_as_address (attr);
4535 /* Read in the comp unit header information from the debug_info at info_ptr.
4536 Use rcuh_kind::COMPILE as the default type if not known by the caller.
4537 NOTE: This leaves members offset, first_die_offset to be filled in
4540 static const gdb_byte *
4541 read_comp_unit_head (struct comp_unit_head *cu_header,
4542 const gdb_byte *info_ptr,
4543 struct dwarf2_section_info *section,
4544 rcuh_kind section_kind)
4547 unsigned int bytes_read;
4548 const char *filename = get_section_file_name (section);
4549 bfd *abfd = get_section_bfd_owner (section);
4551 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
4552 cu_header->initial_length_size = bytes_read;
4553 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
4554 info_ptr += bytes_read;
4555 cu_header->version = read_2_bytes (abfd, info_ptr);
4557 if (cu_header->version < 5)
4558 switch (section_kind)
4560 case rcuh_kind::COMPILE:
4561 cu_header->unit_type = DW_UT_compile;
4563 case rcuh_kind::TYPE:
4564 cu_header->unit_type = DW_UT_type;
4567 internal_error (__FILE__, __LINE__,
4568 _("read_comp_unit_head: invalid section_kind"));
4572 cu_header->unit_type = static_cast<enum dwarf_unit_type>
4573 (read_1_byte (abfd, info_ptr));
4575 switch (cu_header->unit_type)
4578 if (section_kind != rcuh_kind::COMPILE)
4579 error (_("Dwarf Error: wrong unit_type in compilation unit header "
4580 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
4584 section_kind = rcuh_kind::TYPE;
4587 error (_("Dwarf Error: wrong unit_type in compilation unit header "
4588 "(is %d, should be %d or %d) [in module %s]"),
4589 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
4592 cu_header->addr_size = read_1_byte (abfd, info_ptr);
4595 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
4598 info_ptr += bytes_read;
4599 if (cu_header->version < 5)
4601 cu_header->addr_size = read_1_byte (abfd, info_ptr);
4604 signed_addr = bfd_get_sign_extend_vma (abfd);
4605 if (signed_addr < 0)
4606 internal_error (__FILE__, __LINE__,
4607 _("read_comp_unit_head: dwarf from non elf file"));
4608 cu_header->signed_addr_p = signed_addr;
4610 if (section_kind == rcuh_kind::TYPE)
4612 LONGEST type_offset;
4614 cu_header->signature = read_8_bytes (abfd, info_ptr);
4617 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
4618 info_ptr += bytes_read;
4619 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
4620 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
4621 error (_("Dwarf Error: Too big type_offset in compilation unit "
4622 "header (is %s) [in module %s]"), plongest (type_offset),
4629 /* Helper function that returns the proper abbrev section for
4632 static struct dwarf2_section_info *
4633 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
4635 struct dwarf2_section_info *abbrev;
4637 if (this_cu->is_dwz)
4638 abbrev = &dwarf2_get_dwz_file ()->abbrev;
4640 abbrev = &dwarf2_per_objfile->abbrev;
4645 /* Subroutine of read_and_check_comp_unit_head and
4646 read_and_check_type_unit_head to simplify them.
4647 Perform various error checking on the header. */
4650 error_check_comp_unit_head (struct comp_unit_head *header,
4651 struct dwarf2_section_info *section,
4652 struct dwarf2_section_info *abbrev_section)
4654 const char *filename = get_section_file_name (section);
4656 if (header->version < 2 || header->version > 5)
4657 error (_("Dwarf Error: wrong version in compilation unit header "
4658 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
4661 if (to_underlying (header->abbrev_sect_off)
4662 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
4663 error (_("Dwarf Error: bad offset (0x%x) in compilation unit header "
4664 "(offset 0x%x + 6) [in module %s]"),
4665 to_underlying (header->abbrev_sect_off),
4666 to_underlying (header->sect_off),
4669 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
4670 avoid potential 32-bit overflow. */
4671 if (((ULONGEST) header->sect_off + get_cu_length (header))
4673 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
4674 "(offset 0x%x + 0) [in module %s]"),
4675 header->length, to_underlying (header->sect_off),
4679 /* Read in a CU/TU header and perform some basic error checking.
4680 The contents of the header are stored in HEADER.
4681 The result is a pointer to the start of the first DIE. */
4683 static const gdb_byte *
4684 read_and_check_comp_unit_head (struct comp_unit_head *header,
4685 struct dwarf2_section_info *section,
4686 struct dwarf2_section_info *abbrev_section,
4687 const gdb_byte *info_ptr,
4688 rcuh_kind section_kind)
4690 const gdb_byte *beg_of_comp_unit = info_ptr;
4691 bfd *abfd = get_section_bfd_owner (section);
4693 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
4695 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
4697 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
4699 error_check_comp_unit_head (header, section, abbrev_section);
4704 /* Fetch the abbreviation table offset from a comp or type unit header. */
4707 read_abbrev_offset (struct dwarf2_section_info *section,
4708 sect_offset sect_off)
4710 bfd *abfd = get_section_bfd_owner (section);
4711 const gdb_byte *info_ptr;
4712 unsigned int initial_length_size, offset_size;
4715 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4716 info_ptr = section->buffer + to_underlying (sect_off);
4717 read_initial_length (abfd, info_ptr, &initial_length_size);
4718 offset_size = initial_length_size == 4 ? 4 : 8;
4719 info_ptr += initial_length_size;
4721 version = read_2_bytes (abfd, info_ptr);
4725 /* Skip unit type and address size. */
4729 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
4732 /* Allocate a new partial symtab for file named NAME and mark this new
4733 partial symtab as being an include of PST. */
4736 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4737 struct objfile *objfile)
4739 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4741 if (!IS_ABSOLUTE_PATH (subpst->filename))
4743 /* It shares objfile->objfile_obstack. */
4744 subpst->dirname = pst->dirname;
4747 subpst->textlow = 0;
4748 subpst->texthigh = 0;
4750 subpst->dependencies
4751 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
4752 subpst->dependencies[0] = pst;
4753 subpst->number_of_dependencies = 1;
4755 subpst->globals_offset = 0;
4756 subpst->n_global_syms = 0;
4757 subpst->statics_offset = 0;
4758 subpst->n_static_syms = 0;
4759 subpst->compunit_symtab = NULL;
4760 subpst->read_symtab = pst->read_symtab;
4763 /* No private part is necessary for include psymtabs. This property
4764 can be used to differentiate between such include psymtabs and
4765 the regular ones. */
4766 subpst->read_symtab_private = NULL;
4769 /* Read the Line Number Program data and extract the list of files
4770 included by the source file represented by PST. Build an include
4771 partial symtab for each of these included files. */
4774 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4775 struct die_info *die,
4776 struct partial_symtab *pst)
4779 struct attribute *attr;
4781 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4783 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
4785 return; /* No linetable, so no includes. */
4787 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4788 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
4792 hash_signatured_type (const void *item)
4794 const struct signatured_type *sig_type
4795 = (const struct signatured_type *) item;
4797 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4798 return sig_type->signature;
4802 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4804 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
4805 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
4807 return lhs->signature == rhs->signature;
4810 /* Allocate a hash table for signatured types. */
4813 allocate_signatured_type_table (struct objfile *objfile)
4815 return htab_create_alloc_ex (41,
4816 hash_signatured_type,
4819 &objfile->objfile_obstack,
4820 hashtab_obstack_allocate,
4821 dummy_obstack_deallocate);
4824 /* A helper function to add a signatured type CU to a table. */
4827 add_signatured_type_cu_to_table (void **slot, void *datum)
4829 struct signatured_type *sigt = (struct signatured_type *) *slot;
4830 struct signatured_type ***datap = (struct signatured_type ***) datum;
4838 /* A helper for create_debug_types_hash_table. Read types from SECTION
4839 and fill them into TYPES_HTAB. It will process only type units,
4840 therefore DW_UT_type. */
4843 create_debug_type_hash_table (struct dwo_file *dwo_file,
4844 dwarf2_section_info *section, htab_t &types_htab,
4845 rcuh_kind section_kind)
4847 struct objfile *objfile = dwarf2_per_objfile->objfile;
4848 struct dwarf2_section_info *abbrev_section;
4850 const gdb_byte *info_ptr, *end_ptr;
4852 abbrev_section = (dwo_file != NULL
4853 ? &dwo_file->sections.abbrev
4854 : &dwarf2_per_objfile->abbrev);
4856 if (dwarf_read_debug)
4857 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
4858 get_section_name (section),
4859 get_section_file_name (abbrev_section));
4861 dwarf2_read_section (objfile, section);
4862 info_ptr = section->buffer;
4864 if (info_ptr == NULL)
4867 /* We can't set abfd until now because the section may be empty or
4868 not present, in which case the bfd is unknown. */
4869 abfd = get_section_bfd_owner (section);
4871 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4872 because we don't need to read any dies: the signature is in the
4875 end_ptr = info_ptr + section->size;
4876 while (info_ptr < end_ptr)
4878 struct signatured_type *sig_type;
4879 struct dwo_unit *dwo_tu;
4881 const gdb_byte *ptr = info_ptr;
4882 struct comp_unit_head header;
4883 unsigned int length;
4885 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
4887 /* Initialize it due to a false compiler warning. */
4888 header.signature = -1;
4889 header.type_cu_offset_in_tu = (cu_offset) -1;
4891 /* We need to read the type's signature in order to build the hash
4892 table, but we don't need anything else just yet. */
4894 ptr = read_and_check_comp_unit_head (&header, section,
4895 abbrev_section, ptr, section_kind);
4897 length = get_cu_length (&header);
4899 /* Skip dummy type units. */
4900 if (ptr >= info_ptr + length
4901 || peek_abbrev_code (abfd, ptr) == 0
4902 || header.unit_type != DW_UT_type)
4908 if (types_htab == NULL)
4911 types_htab = allocate_dwo_unit_table (objfile);
4913 types_htab = allocate_signatured_type_table (objfile);
4919 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4921 dwo_tu->dwo_file = dwo_file;
4922 dwo_tu->signature = header.signature;
4923 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
4924 dwo_tu->section = section;
4925 dwo_tu->sect_off = sect_off;
4926 dwo_tu->length = length;
4930 /* N.B.: type_offset is not usable if this type uses a DWO file.
4931 The real type_offset is in the DWO file. */
4933 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4934 struct signatured_type);
4935 sig_type->signature = header.signature;
4936 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
4937 sig_type->per_cu.objfile = objfile;
4938 sig_type->per_cu.is_debug_types = 1;
4939 sig_type->per_cu.section = section;
4940 sig_type->per_cu.sect_off = sect_off;
4941 sig_type->per_cu.length = length;
4944 slot = htab_find_slot (types_htab,
4945 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4947 gdb_assert (slot != NULL);
4950 sect_offset dup_sect_off;
4954 const struct dwo_unit *dup_tu
4955 = (const struct dwo_unit *) *slot;
4957 dup_sect_off = dup_tu->sect_off;
4961 const struct signatured_type *dup_tu
4962 = (const struct signatured_type *) *slot;
4964 dup_sect_off = dup_tu->per_cu.sect_off;
4967 complaint (&symfile_complaints,
4968 _("debug type entry at offset 0x%x is duplicate to"
4969 " the entry at offset 0x%x, signature %s"),
4970 to_underlying (sect_off), to_underlying (dup_sect_off),
4971 hex_string (header.signature));
4973 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4975 if (dwarf_read_debug > 1)
4976 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
4977 to_underlying (sect_off),
4978 hex_string (header.signature));
4984 /* Create the hash table of all entries in the .debug_types
4985 (or .debug_types.dwo) section(s).
4986 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4987 otherwise it is NULL.
4989 The result is a pointer to the hash table or NULL if there are no types.
4991 Note: This function processes DWO files only, not DWP files. */
4994 create_debug_types_hash_table (struct dwo_file *dwo_file,
4995 VEC (dwarf2_section_info_def) *types,
4999 struct dwarf2_section_info *section;
5001 if (VEC_empty (dwarf2_section_info_def, types))
5005 VEC_iterate (dwarf2_section_info_def, types, ix, section);
5007 create_debug_type_hash_table (dwo_file, section, types_htab,
5011 /* Create the hash table of all entries in the .debug_types section,
5012 and initialize all_type_units.
5013 The result is zero if there is an error (e.g. missing .debug_types section),
5014 otherwise non-zero. */
5017 create_all_type_units (struct objfile *objfile)
5019 htab_t types_htab = NULL;
5020 struct signatured_type **iter;
5022 create_debug_type_hash_table (NULL, &dwarf2_per_objfile->info, types_htab,
5023 rcuh_kind::COMPILE);
5024 create_debug_types_hash_table (NULL, dwarf2_per_objfile->types, types_htab);
5025 if (types_htab == NULL)
5027 dwarf2_per_objfile->signatured_types = NULL;
5031 dwarf2_per_objfile->signatured_types = types_htab;
5033 dwarf2_per_objfile->n_type_units
5034 = dwarf2_per_objfile->n_allocated_type_units
5035 = htab_elements (types_htab);
5036 dwarf2_per_objfile->all_type_units =
5037 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
5038 iter = &dwarf2_per_objfile->all_type_units[0];
5039 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
5040 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
5041 == dwarf2_per_objfile->n_type_units);
5046 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
5047 If SLOT is non-NULL, it is the entry to use in the hash table.
5048 Otherwise we find one. */
5050 static struct signatured_type *
5051 add_type_unit (ULONGEST sig, void **slot)
5053 struct objfile *objfile = dwarf2_per_objfile->objfile;
5054 int n_type_units = dwarf2_per_objfile->n_type_units;
5055 struct signatured_type *sig_type;
5057 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
5059 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
5061 if (dwarf2_per_objfile->n_allocated_type_units == 0)
5062 dwarf2_per_objfile->n_allocated_type_units = 1;
5063 dwarf2_per_objfile->n_allocated_type_units *= 2;
5064 dwarf2_per_objfile->all_type_units
5065 = XRESIZEVEC (struct signatured_type *,
5066 dwarf2_per_objfile->all_type_units,
5067 dwarf2_per_objfile->n_allocated_type_units);
5068 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
5070 dwarf2_per_objfile->n_type_units = n_type_units;
5072 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5073 struct signatured_type);
5074 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
5075 sig_type->signature = sig;
5076 sig_type->per_cu.is_debug_types = 1;
5077 if (dwarf2_per_objfile->using_index)
5079 sig_type->per_cu.v.quick =
5080 OBSTACK_ZALLOC (&objfile->objfile_obstack,
5081 struct dwarf2_per_cu_quick_data);
5086 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5089 gdb_assert (*slot == NULL);
5091 /* The rest of sig_type must be filled in by the caller. */
5095 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
5096 Fill in SIG_ENTRY with DWO_ENTRY. */
5099 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
5100 struct signatured_type *sig_entry,
5101 struct dwo_unit *dwo_entry)
5103 /* Make sure we're not clobbering something we don't expect to. */
5104 gdb_assert (! sig_entry->per_cu.queued);
5105 gdb_assert (sig_entry->per_cu.cu == NULL);
5106 if (dwarf2_per_objfile->using_index)
5108 gdb_assert (sig_entry->per_cu.v.quick != NULL);
5109 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
5112 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
5113 gdb_assert (sig_entry->signature == dwo_entry->signature);
5114 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
5115 gdb_assert (sig_entry->type_unit_group == NULL);
5116 gdb_assert (sig_entry->dwo_unit == NULL);
5118 sig_entry->per_cu.section = dwo_entry->section;
5119 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
5120 sig_entry->per_cu.length = dwo_entry->length;
5121 sig_entry->per_cu.reading_dwo_directly = 1;
5122 sig_entry->per_cu.objfile = objfile;
5123 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
5124 sig_entry->dwo_unit = dwo_entry;
5127 /* Subroutine of lookup_signatured_type.
5128 If we haven't read the TU yet, create the signatured_type data structure
5129 for a TU to be read in directly from a DWO file, bypassing the stub.
5130 This is the "Stay in DWO Optimization": When there is no DWP file and we're
5131 using .gdb_index, then when reading a CU we want to stay in the DWO file
5132 containing that CU. Otherwise we could end up reading several other DWO
5133 files (due to comdat folding) to process the transitive closure of all the
5134 mentioned TUs, and that can be slow. The current DWO file will have every
5135 type signature that it needs.
5136 We only do this for .gdb_index because in the psymtab case we already have
5137 to read all the DWOs to build the type unit groups. */
5139 static struct signatured_type *
5140 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5142 struct objfile *objfile = dwarf2_per_objfile->objfile;
5143 struct dwo_file *dwo_file;
5144 struct dwo_unit find_dwo_entry, *dwo_entry;
5145 struct signatured_type find_sig_entry, *sig_entry;
5148 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
5150 /* If TU skeletons have been removed then we may not have read in any
5152 if (dwarf2_per_objfile->signatured_types == NULL)
5154 dwarf2_per_objfile->signatured_types
5155 = allocate_signatured_type_table (objfile);
5158 /* We only ever need to read in one copy of a signatured type.
5159 Use the global signatured_types array to do our own comdat-folding
5160 of types. If this is the first time we're reading this TU, and
5161 the TU has an entry in .gdb_index, replace the recorded data from
5162 .gdb_index with this TU. */
5164 find_sig_entry.signature = sig;
5165 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5166 &find_sig_entry, INSERT);
5167 sig_entry = (struct signatured_type *) *slot;
5169 /* We can get here with the TU already read, *or* in the process of being
5170 read. Don't reassign the global entry to point to this DWO if that's
5171 the case. Also note that if the TU is already being read, it may not
5172 have come from a DWO, the program may be a mix of Fission-compiled
5173 code and non-Fission-compiled code. */
5175 /* Have we already tried to read this TU?
5176 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
5177 needn't exist in the global table yet). */
5178 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
5181 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
5182 dwo_unit of the TU itself. */
5183 dwo_file = cu->dwo_unit->dwo_file;
5185 /* Ok, this is the first time we're reading this TU. */
5186 if (dwo_file->tus == NULL)
5188 find_dwo_entry.signature = sig;
5189 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
5190 if (dwo_entry == NULL)
5193 /* If the global table doesn't have an entry for this TU, add one. */
5194 if (sig_entry == NULL)
5195 sig_entry = add_type_unit (sig, slot);
5197 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
5198 sig_entry->per_cu.tu_read = 1;
5202 /* Subroutine of lookup_signatured_type.
5203 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
5204 then try the DWP file. If the TU stub (skeleton) has been removed then
5205 it won't be in .gdb_index. */
5207 static struct signatured_type *
5208 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5210 struct objfile *objfile = dwarf2_per_objfile->objfile;
5211 struct dwp_file *dwp_file = get_dwp_file ();
5212 struct dwo_unit *dwo_entry;
5213 struct signatured_type find_sig_entry, *sig_entry;
5216 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
5217 gdb_assert (dwp_file != NULL);
5219 /* If TU skeletons have been removed then we may not have read in any
5221 if (dwarf2_per_objfile->signatured_types == NULL)
5223 dwarf2_per_objfile->signatured_types
5224 = allocate_signatured_type_table (objfile);
5227 find_sig_entry.signature = sig;
5228 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5229 &find_sig_entry, INSERT);
5230 sig_entry = (struct signatured_type *) *slot;
5232 /* Have we already tried to read this TU?
5233 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
5234 needn't exist in the global table yet). */
5235 if (sig_entry != NULL)
5238 if (dwp_file->tus == NULL)
5240 dwo_entry = lookup_dwo_unit_in_dwp (dwp_file, NULL,
5241 sig, 1 /* is_debug_types */);
5242 if (dwo_entry == NULL)
5245 sig_entry = add_type_unit (sig, slot);
5246 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
5251 /* Lookup a signature based type for DW_FORM_ref_sig8.
5252 Returns NULL if signature SIG is not present in the table.
5253 It is up to the caller to complain about this. */
5255 static struct signatured_type *
5256 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5259 && dwarf2_per_objfile->using_index)
5261 /* We're in a DWO/DWP file, and we're using .gdb_index.
5262 These cases require special processing. */
5263 if (get_dwp_file () == NULL)
5264 return lookup_dwo_signatured_type (cu, sig);
5266 return lookup_dwp_signatured_type (cu, sig);
5270 struct signatured_type find_entry, *entry;
5272 if (dwarf2_per_objfile->signatured_types == NULL)
5274 find_entry.signature = sig;
5275 entry = ((struct signatured_type *)
5276 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
5281 /* Low level DIE reading support. */
5283 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
5286 init_cu_die_reader (struct die_reader_specs *reader,
5287 struct dwarf2_cu *cu,
5288 struct dwarf2_section_info *section,
5289 struct dwo_file *dwo_file)
5291 gdb_assert (section->readin && section->buffer != NULL);
5292 reader->abfd = get_section_bfd_owner (section);
5294 reader->dwo_file = dwo_file;
5295 reader->die_section = section;
5296 reader->buffer = section->buffer;
5297 reader->buffer_end = section->buffer + section->size;
5298 reader->comp_dir = NULL;
5301 /* Subroutine of init_cutu_and_read_dies to simplify it.
5302 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
5303 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
5306 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
5307 from it to the DIE in the DWO. If NULL we are skipping the stub.
5308 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
5309 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
5310 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
5311 STUB_COMP_DIR may be non-NULL.
5312 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
5313 are filled in with the info of the DIE from the DWO file.
5314 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
5315 provided an abbrev table to use.
5316 The result is non-zero if a valid (non-dummy) DIE was found. */
5319 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
5320 struct dwo_unit *dwo_unit,
5321 int abbrev_table_provided,
5322 struct die_info *stub_comp_unit_die,
5323 const char *stub_comp_dir,
5324 struct die_reader_specs *result_reader,
5325 const gdb_byte **result_info_ptr,
5326 struct die_info **result_comp_unit_die,
5327 int *result_has_children)
5329 struct objfile *objfile = dwarf2_per_objfile->objfile;
5330 struct dwarf2_cu *cu = this_cu->cu;
5331 struct dwarf2_section_info *section;
5333 const gdb_byte *begin_info_ptr, *info_ptr;
5334 ULONGEST signature; /* Or dwo_id. */
5335 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
5336 int i,num_extra_attrs;
5337 struct dwarf2_section_info *dwo_abbrev_section;
5338 struct attribute *attr;
5339 struct die_info *comp_unit_die;
5341 /* At most one of these may be provided. */
5342 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
5344 /* These attributes aren't processed until later:
5345 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
5346 DW_AT_comp_dir is used now, to find the DWO file, but it is also
5347 referenced later. However, these attributes are found in the stub
5348 which we won't have later. In order to not impose this complication
5349 on the rest of the code, we read them here and copy them to the
5358 if (stub_comp_unit_die != NULL)
5360 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
5362 if (! this_cu->is_debug_types)
5363 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
5364 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
5365 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
5366 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
5367 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
5369 /* There should be a DW_AT_addr_base attribute here (if needed).
5370 We need the value before we can process DW_FORM_GNU_addr_index. */
5372 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
5374 cu->addr_base = DW_UNSND (attr);
5376 /* There should be a DW_AT_ranges_base attribute here (if needed).
5377 We need the value before we can process DW_AT_ranges. */
5378 cu->ranges_base = 0;
5379 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
5381 cu->ranges_base = DW_UNSND (attr);
5383 else if (stub_comp_dir != NULL)
5385 /* Reconstruct the comp_dir attribute to simplify the code below. */
5386 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
5387 comp_dir->name = DW_AT_comp_dir;
5388 comp_dir->form = DW_FORM_string;
5389 DW_STRING_IS_CANONICAL (comp_dir) = 0;
5390 DW_STRING (comp_dir) = stub_comp_dir;
5393 /* Set up for reading the DWO CU/TU. */
5394 cu->dwo_unit = dwo_unit;
5395 section = dwo_unit->section;
5396 dwarf2_read_section (objfile, section);
5397 abfd = get_section_bfd_owner (section);
5398 begin_info_ptr = info_ptr = (section->buffer
5399 + to_underlying (dwo_unit->sect_off));
5400 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
5401 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
5403 if (this_cu->is_debug_types)
5405 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
5407 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5409 info_ptr, rcuh_kind::TYPE);
5410 /* This is not an assert because it can be caused by bad debug info. */
5411 if (sig_type->signature != cu->header.signature)
5413 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
5414 " TU at offset 0x%x [in module %s]"),
5415 hex_string (sig_type->signature),
5416 hex_string (cu->header.signature),
5417 to_underlying (dwo_unit->sect_off),
5418 bfd_get_filename (abfd));
5420 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
5421 /* For DWOs coming from DWP files, we don't know the CU length
5422 nor the type's offset in the TU until now. */
5423 dwo_unit->length = get_cu_length (&cu->header);
5424 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
5426 /* Establish the type offset that can be used to lookup the type.
5427 For DWO files, we don't know it until now. */
5428 sig_type->type_offset_in_section
5429 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
5433 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5435 info_ptr, rcuh_kind::COMPILE);
5436 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
5437 /* For DWOs coming from DWP files, we don't know the CU length
5439 dwo_unit->length = get_cu_length (&cu->header);
5442 /* Replace the CU's original abbrev table with the DWO's.
5443 Reminder: We can't read the abbrev table until we've read the header. */
5444 if (abbrev_table_provided)
5446 /* Don't free the provided abbrev table, the caller of
5447 init_cutu_and_read_dies owns it. */
5448 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5449 /* Ensure the DWO abbrev table gets freed. */
5450 make_cleanup (dwarf2_free_abbrev_table, cu);
5454 dwarf2_free_abbrev_table (cu);
5455 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5456 /* Leave any existing abbrev table cleanup as is. */
5459 /* Read in the die, but leave space to copy over the attributes
5460 from the stub. This has the benefit of simplifying the rest of
5461 the code - all the work to maintain the illusion of a single
5462 DW_TAG_{compile,type}_unit DIE is done here. */
5463 num_extra_attrs = ((stmt_list != NULL)
5467 + (comp_dir != NULL));
5468 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
5469 result_has_children, num_extra_attrs);
5471 /* Copy over the attributes from the stub to the DIE we just read in. */
5472 comp_unit_die = *result_comp_unit_die;
5473 i = comp_unit_die->num_attrs;
5474 if (stmt_list != NULL)
5475 comp_unit_die->attrs[i++] = *stmt_list;
5477 comp_unit_die->attrs[i++] = *low_pc;
5478 if (high_pc != NULL)
5479 comp_unit_die->attrs[i++] = *high_pc;
5481 comp_unit_die->attrs[i++] = *ranges;
5482 if (comp_dir != NULL)
5483 comp_unit_die->attrs[i++] = *comp_dir;
5484 comp_unit_die->num_attrs += num_extra_attrs;
5486 if (dwarf_die_debug)
5488 fprintf_unfiltered (gdb_stdlog,
5489 "Read die from %s@0x%x of %s:\n",
5490 get_section_name (section),
5491 (unsigned) (begin_info_ptr - section->buffer),
5492 bfd_get_filename (abfd));
5493 dump_die (comp_unit_die, dwarf_die_debug);
5496 /* Save the comp_dir attribute. If there is no DWP file then we'll read
5497 TUs by skipping the stub and going directly to the entry in the DWO file.
5498 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
5499 to get it via circuitous means. Blech. */
5500 if (comp_dir != NULL)
5501 result_reader->comp_dir = DW_STRING (comp_dir);
5503 /* Skip dummy compilation units. */
5504 if (info_ptr >= begin_info_ptr + dwo_unit->length
5505 || peek_abbrev_code (abfd, info_ptr) == 0)
5508 *result_info_ptr = info_ptr;
5512 /* Subroutine of init_cutu_and_read_dies to simplify it.
5513 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
5514 Returns NULL if the specified DWO unit cannot be found. */
5516 static struct dwo_unit *
5517 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
5518 struct die_info *comp_unit_die)
5520 struct dwarf2_cu *cu = this_cu->cu;
5521 struct attribute *attr;
5523 struct dwo_unit *dwo_unit;
5524 const char *comp_dir, *dwo_name;
5526 gdb_assert (cu != NULL);
5528 /* Yeah, we look dwo_name up again, but it simplifies the code. */
5529 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5530 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
5532 if (this_cu->is_debug_types)
5534 struct signatured_type *sig_type;
5536 /* Since this_cu is the first member of struct signatured_type,
5537 we can go from a pointer to one to a pointer to the other. */
5538 sig_type = (struct signatured_type *) this_cu;
5539 signature = sig_type->signature;
5540 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
5544 struct attribute *attr;
5546 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
5548 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
5550 dwo_name, objfile_name (this_cu->objfile));
5551 signature = DW_UNSND (attr);
5552 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
5559 /* Subroutine of init_cutu_and_read_dies to simplify it.
5560 See it for a description of the parameters.
5561 Read a TU directly from a DWO file, bypassing the stub.
5563 Note: This function could be a little bit simpler if we shared cleanups
5564 with our caller, init_cutu_and_read_dies. That's generally a fragile thing
5565 to do, so we keep this function self-contained. Or we could move this
5566 into our caller, but it's complex enough already. */
5569 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
5570 int use_existing_cu, int keep,
5571 die_reader_func_ftype *die_reader_func,
5574 struct dwarf2_cu *cu;
5575 struct signatured_type *sig_type;
5576 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5577 struct die_reader_specs reader;
5578 const gdb_byte *info_ptr;
5579 struct die_info *comp_unit_die;
5582 /* Verify we can do the following downcast, and that we have the
5584 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
5585 sig_type = (struct signatured_type *) this_cu;
5586 gdb_assert (sig_type->dwo_unit != NULL);
5588 cleanups = make_cleanup (null_cleanup, NULL);
5590 if (use_existing_cu && this_cu->cu != NULL)
5592 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
5594 /* There's no need to do the rereading_dwo_cu handling that
5595 init_cutu_and_read_dies does since we don't read the stub. */
5599 /* If !use_existing_cu, this_cu->cu must be NULL. */
5600 gdb_assert (this_cu->cu == NULL);
5601 cu = XNEW (struct dwarf2_cu);
5602 init_one_comp_unit (cu, this_cu);
5603 /* If an error occurs while loading, release our storage. */
5604 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5607 /* A future optimization, if needed, would be to use an existing
5608 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
5609 could share abbrev tables. */
5611 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
5612 0 /* abbrev_table_provided */,
5613 NULL /* stub_comp_unit_die */,
5614 sig_type->dwo_unit->dwo_file->comp_dir,
5616 &comp_unit_die, &has_children) == 0)
5619 do_cleanups (cleanups);
5623 /* All the "real" work is done here. */
5624 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5626 /* This duplicates the code in init_cutu_and_read_dies,
5627 but the alternative is making the latter more complex.
5628 This function is only for the special case of using DWO files directly:
5629 no point in overly complicating the general case just to handle this. */
5630 if (free_cu_cleanup != NULL)
5634 /* We've successfully allocated this compilation unit. Let our
5635 caller clean it up when finished with it. */
5636 discard_cleanups (free_cu_cleanup);
5638 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5639 So we have to manually free the abbrev table. */
5640 dwarf2_free_abbrev_table (cu);
5642 /* Link this CU into read_in_chain. */
5643 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5644 dwarf2_per_objfile->read_in_chain = this_cu;
5647 do_cleanups (free_cu_cleanup);
5650 do_cleanups (cleanups);
5653 /* Initialize a CU (or TU) and read its DIEs.
5654 If the CU defers to a DWO file, read the DWO file as well.
5656 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
5657 Otherwise the table specified in the comp unit header is read in and used.
5658 This is an optimization for when we already have the abbrev table.
5660 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
5661 Otherwise, a new CU is allocated with xmalloc.
5663 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
5664 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
5666 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5667 linker) then DIE_READER_FUNC will not get called. */
5670 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
5671 struct abbrev_table *abbrev_table,
5672 int use_existing_cu, int keep,
5673 die_reader_func_ftype *die_reader_func,
5676 struct objfile *objfile = dwarf2_per_objfile->objfile;
5677 struct dwarf2_section_info *section = this_cu->section;
5678 bfd *abfd = get_section_bfd_owner (section);
5679 struct dwarf2_cu *cu;
5680 const gdb_byte *begin_info_ptr, *info_ptr;
5681 struct die_reader_specs reader;
5682 struct die_info *comp_unit_die;
5684 struct attribute *attr;
5685 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5686 struct signatured_type *sig_type = NULL;
5687 struct dwarf2_section_info *abbrev_section;
5688 /* Non-zero if CU currently points to a DWO file and we need to
5689 reread it. When this happens we need to reread the skeleton die
5690 before we can reread the DWO file (this only applies to CUs, not TUs). */
5691 int rereading_dwo_cu = 0;
5693 if (dwarf_die_debug)
5694 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5695 this_cu->is_debug_types ? "type" : "comp",
5696 to_underlying (this_cu->sect_off));
5698 if (use_existing_cu)
5701 /* If we're reading a TU directly from a DWO file, including a virtual DWO
5702 file (instead of going through the stub), short-circuit all of this. */
5703 if (this_cu->reading_dwo_directly)
5705 /* Narrow down the scope of possibilities to have to understand. */
5706 gdb_assert (this_cu->is_debug_types);
5707 gdb_assert (abbrev_table == NULL);
5708 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
5709 die_reader_func, data);
5713 cleanups = make_cleanup (null_cleanup, NULL);
5715 /* This is cheap if the section is already read in. */
5716 dwarf2_read_section (objfile, section);
5718 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
5720 abbrev_section = get_abbrev_section_for_cu (this_cu);
5722 if (use_existing_cu && this_cu->cu != NULL)
5725 /* If this CU is from a DWO file we need to start over, we need to
5726 refetch the attributes from the skeleton CU.
5727 This could be optimized by retrieving those attributes from when we
5728 were here the first time: the previous comp_unit_die was stored in
5729 comp_unit_obstack. But there's no data yet that we need this
5731 if (cu->dwo_unit != NULL)
5732 rereading_dwo_cu = 1;
5736 /* If !use_existing_cu, this_cu->cu must be NULL. */
5737 gdb_assert (this_cu->cu == NULL);
5738 cu = XNEW (struct dwarf2_cu);
5739 init_one_comp_unit (cu, this_cu);
5740 /* If an error occurs while loading, release our storage. */
5741 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5744 /* Get the header. */
5745 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
5747 /* We already have the header, there's no need to read it in again. */
5748 info_ptr += to_underlying (cu->header.first_die_cu_offset);
5752 if (this_cu->is_debug_types)
5754 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5755 abbrev_section, info_ptr,
5758 /* Since per_cu is the first member of struct signatured_type,
5759 we can go from a pointer to one to a pointer to the other. */
5760 sig_type = (struct signatured_type *) this_cu;
5761 gdb_assert (sig_type->signature == cu->header.signature);
5762 gdb_assert (sig_type->type_offset_in_tu
5763 == cu->header.type_cu_offset_in_tu);
5764 gdb_assert (this_cu->sect_off == cu->header.sect_off);
5766 /* LENGTH has not been set yet for type units if we're
5767 using .gdb_index. */
5768 this_cu->length = get_cu_length (&cu->header);
5770 /* Establish the type offset that can be used to lookup the type. */
5771 sig_type->type_offset_in_section =
5772 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
5774 this_cu->dwarf_version = cu->header.version;
5778 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5781 rcuh_kind::COMPILE);
5783 gdb_assert (this_cu->sect_off == cu->header.sect_off);
5784 gdb_assert (this_cu->length == get_cu_length (&cu->header));
5785 this_cu->dwarf_version = cu->header.version;
5789 /* Skip dummy compilation units. */
5790 if (info_ptr >= begin_info_ptr + this_cu->length
5791 || peek_abbrev_code (abfd, info_ptr) == 0)
5793 do_cleanups (cleanups);
5797 /* If we don't have them yet, read the abbrevs for this compilation unit.
5798 And if we need to read them now, make sure they're freed when we're
5799 done. Note that it's important that if the CU had an abbrev table
5800 on entry we don't free it when we're done: Somewhere up the call stack
5801 it may be in use. */
5802 if (abbrev_table != NULL)
5804 gdb_assert (cu->abbrev_table == NULL);
5805 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
5806 cu->abbrev_table = abbrev_table;
5808 else if (cu->abbrev_table == NULL)
5810 dwarf2_read_abbrevs (cu, abbrev_section);
5811 make_cleanup (dwarf2_free_abbrev_table, cu);
5813 else if (rereading_dwo_cu)
5815 dwarf2_free_abbrev_table (cu);
5816 dwarf2_read_abbrevs (cu, abbrev_section);
5819 /* Read the top level CU/TU die. */
5820 init_cu_die_reader (&reader, cu, section, NULL);
5821 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5823 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
5825 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
5826 DWO CU, that this test will fail (the attribute will not be present). */
5827 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5830 struct dwo_unit *dwo_unit;
5831 struct die_info *dwo_comp_unit_die;
5835 complaint (&symfile_complaints,
5836 _("compilation unit with DW_AT_GNU_dwo_name"
5837 " has children (offset 0x%x) [in module %s]"),
5838 to_underlying (this_cu->sect_off), bfd_get_filename (abfd));
5840 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
5841 if (dwo_unit != NULL)
5843 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
5844 abbrev_table != NULL,
5845 comp_unit_die, NULL,
5847 &dwo_comp_unit_die, &has_children) == 0)
5850 do_cleanups (cleanups);
5853 comp_unit_die = dwo_comp_unit_die;
5857 /* Yikes, we couldn't find the rest of the DIE, we only have
5858 the stub. A complaint has already been logged. There's
5859 not much more we can do except pass on the stub DIE to
5860 die_reader_func. We don't want to throw an error on bad
5865 /* All of the above is setup for this call. Yikes. */
5866 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5868 /* Done, clean up. */
5869 if (free_cu_cleanup != NULL)
5873 /* We've successfully allocated this compilation unit. Let our
5874 caller clean it up when finished with it. */
5875 discard_cleanups (free_cu_cleanup);
5877 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5878 So we have to manually free the abbrev table. */
5879 dwarf2_free_abbrev_table (cu);
5881 /* Link this CU into read_in_chain. */
5882 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5883 dwarf2_per_objfile->read_in_chain = this_cu;
5886 do_cleanups (free_cu_cleanup);
5889 do_cleanups (cleanups);
5892 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
5893 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
5894 to have already done the lookup to find the DWO file).
5896 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
5897 THIS_CU->is_debug_types, but nothing else.
5899 We fill in THIS_CU->length.
5901 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5902 linker) then DIE_READER_FUNC will not get called.
5904 THIS_CU->cu is always freed when done.
5905 This is done in order to not leave THIS_CU->cu in a state where we have
5906 to care whether it refers to the "main" CU or the DWO CU. */
5909 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
5910 struct dwo_file *dwo_file,
5911 die_reader_func_ftype *die_reader_func,
5914 struct objfile *objfile = dwarf2_per_objfile->objfile;
5915 struct dwarf2_section_info *section = this_cu->section;
5916 bfd *abfd = get_section_bfd_owner (section);
5917 struct dwarf2_section_info *abbrev_section;
5918 struct dwarf2_cu cu;
5919 const gdb_byte *begin_info_ptr, *info_ptr;
5920 struct die_reader_specs reader;
5921 struct cleanup *cleanups;
5922 struct die_info *comp_unit_die;
5925 if (dwarf_die_debug)
5926 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5927 this_cu->is_debug_types ? "type" : "comp",
5928 to_underlying (this_cu->sect_off));
5930 gdb_assert (this_cu->cu == NULL);
5932 abbrev_section = (dwo_file != NULL
5933 ? &dwo_file->sections.abbrev
5934 : get_abbrev_section_for_cu (this_cu));
5936 /* This is cheap if the section is already read in. */
5937 dwarf2_read_section (objfile, section);
5939 init_one_comp_unit (&cu, this_cu);
5941 cleanups = make_cleanup (free_stack_comp_unit, &cu);
5943 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
5944 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
5945 abbrev_section, info_ptr,
5946 (this_cu->is_debug_types
5948 : rcuh_kind::COMPILE));
5950 this_cu->length = get_cu_length (&cu.header);
5952 /* Skip dummy compilation units. */
5953 if (info_ptr >= begin_info_ptr + this_cu->length
5954 || peek_abbrev_code (abfd, info_ptr) == 0)
5956 do_cleanups (cleanups);
5960 dwarf2_read_abbrevs (&cu, abbrev_section);
5961 make_cleanup (dwarf2_free_abbrev_table, &cu);
5963 init_cu_die_reader (&reader, &cu, section, dwo_file);
5964 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5966 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5968 do_cleanups (cleanups);
5971 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
5972 does not lookup the specified DWO file.
5973 This cannot be used to read DWO files.
5975 THIS_CU->cu is always freed when done.
5976 This is done in order to not leave THIS_CU->cu in a state where we have
5977 to care whether it refers to the "main" CU or the DWO CU.
5978 We can revisit this if the data shows there's a performance issue. */
5981 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
5982 die_reader_func_ftype *die_reader_func,
5985 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
5988 /* Type Unit Groups.
5990 Type Unit Groups are a way to collapse the set of all TUs (type units) into
5991 a more manageable set. The grouping is done by DW_AT_stmt_list entry
5992 so that all types coming from the same compilation (.o file) are grouped
5993 together. A future step could be to put the types in the same symtab as
5994 the CU the types ultimately came from. */
5997 hash_type_unit_group (const void *item)
5999 const struct type_unit_group *tu_group
6000 = (const struct type_unit_group *) item;
6002 return hash_stmt_list_entry (&tu_group->hash);
6006 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
6008 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
6009 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
6011 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
6014 /* Allocate a hash table for type unit groups. */
6017 allocate_type_unit_groups_table (void)
6019 return htab_create_alloc_ex (3,
6020 hash_type_unit_group,
6023 &dwarf2_per_objfile->objfile->objfile_obstack,
6024 hashtab_obstack_allocate,
6025 dummy_obstack_deallocate);
6028 /* Type units that don't have DW_AT_stmt_list are grouped into their own
6029 partial symtabs. We combine several TUs per psymtab to not let the size
6030 of any one psymtab grow too big. */
6031 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
6032 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
6034 /* Helper routine for get_type_unit_group.
6035 Create the type_unit_group object used to hold one or more TUs. */
6037 static struct type_unit_group *
6038 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
6040 struct objfile *objfile = dwarf2_per_objfile->objfile;
6041 struct dwarf2_per_cu_data *per_cu;
6042 struct type_unit_group *tu_group;
6044 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6045 struct type_unit_group);
6046 per_cu = &tu_group->per_cu;
6047 per_cu->objfile = objfile;
6049 if (dwarf2_per_objfile->using_index)
6051 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6052 struct dwarf2_per_cu_quick_data);
6056 unsigned int line_offset = to_underlying (line_offset_struct);
6057 struct partial_symtab *pst;
6060 /* Give the symtab a useful name for debug purposes. */
6061 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
6062 name = xstrprintf ("<type_units_%d>",
6063 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
6065 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
6067 pst = create_partial_symtab (per_cu, name);
6073 tu_group->hash.dwo_unit = cu->dwo_unit;
6074 tu_group->hash.line_sect_off = line_offset_struct;
6079 /* Look up the type_unit_group for type unit CU, and create it if necessary.
6080 STMT_LIST is a DW_AT_stmt_list attribute. */
6082 static struct type_unit_group *
6083 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
6085 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6086 struct type_unit_group *tu_group;
6088 unsigned int line_offset;
6089 struct type_unit_group type_unit_group_for_lookup;
6091 if (dwarf2_per_objfile->type_unit_groups == NULL)
6093 dwarf2_per_objfile->type_unit_groups =
6094 allocate_type_unit_groups_table ();
6097 /* Do we need to create a new group, or can we use an existing one? */
6101 line_offset = DW_UNSND (stmt_list);
6102 ++tu_stats->nr_symtab_sharers;
6106 /* Ugh, no stmt_list. Rare, but we have to handle it.
6107 We can do various things here like create one group per TU or
6108 spread them over multiple groups to split up the expansion work.
6109 To avoid worst case scenarios (too many groups or too large groups)
6110 we, umm, group them in bunches. */
6111 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
6112 | (tu_stats->nr_stmt_less_type_units
6113 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
6114 ++tu_stats->nr_stmt_less_type_units;
6117 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
6118 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
6119 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
6120 &type_unit_group_for_lookup, INSERT);
6123 tu_group = (struct type_unit_group *) *slot;
6124 gdb_assert (tu_group != NULL);
6128 sect_offset line_offset_struct = (sect_offset) line_offset;
6129 tu_group = create_type_unit_group (cu, line_offset_struct);
6131 ++tu_stats->nr_symtabs;
6137 /* Partial symbol tables. */
6139 /* Create a psymtab named NAME and assign it to PER_CU.
6141 The caller must fill in the following details:
6142 dirname, textlow, texthigh. */
6144 static struct partial_symtab *
6145 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
6147 struct objfile *objfile = per_cu->objfile;
6148 struct partial_symtab *pst;
6150 pst = start_psymtab_common (objfile, name, 0,
6151 objfile->global_psymbols.next,
6152 objfile->static_psymbols.next);
6154 pst->psymtabs_addrmap_supported = 1;
6156 /* This is the glue that links PST into GDB's symbol API. */
6157 pst->read_symtab_private = per_cu;
6158 pst->read_symtab = dwarf2_read_symtab;
6159 per_cu->v.psymtab = pst;
6164 /* The DATA object passed to process_psymtab_comp_unit_reader has this
6167 struct process_psymtab_comp_unit_data
6169 /* True if we are reading a DW_TAG_partial_unit. */
6171 int want_partial_unit;
6173 /* The "pretend" language that is used if the CU doesn't declare a
6176 enum language pretend_language;
6179 /* die_reader_func for process_psymtab_comp_unit. */
6182 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
6183 const gdb_byte *info_ptr,
6184 struct die_info *comp_unit_die,
6188 struct dwarf2_cu *cu = reader->cu;
6189 struct objfile *objfile = cu->objfile;
6190 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6191 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6193 CORE_ADDR best_lowpc = 0, best_highpc = 0;
6194 struct partial_symtab *pst;
6195 enum pc_bounds_kind cu_bounds_kind;
6196 const char *filename;
6197 struct process_psymtab_comp_unit_data *info
6198 = (struct process_psymtab_comp_unit_data *) data;
6200 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
6203 gdb_assert (! per_cu->is_debug_types);
6205 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
6207 cu->list_in_scope = &file_symbols;
6209 /* Allocate a new partial symbol table structure. */
6210 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
6211 if (filename == NULL)
6214 pst = create_partial_symtab (per_cu, filename);
6216 /* This must be done before calling dwarf2_build_include_psymtabs. */
6217 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
6219 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6221 dwarf2_find_base_address (comp_unit_die, cu);
6223 /* Possibly set the default values of LOWPC and HIGHPC from
6225 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
6226 &best_highpc, cu, pst);
6227 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
6228 /* Store the contiguous range if it is not empty; it can be empty for
6229 CUs with no code. */
6230 addrmap_set_empty (objfile->psymtabs_addrmap,
6231 gdbarch_adjust_dwarf2_addr (gdbarch,
6232 best_lowpc + baseaddr),
6233 gdbarch_adjust_dwarf2_addr (gdbarch,
6234 best_highpc + baseaddr) - 1,
6237 /* Check if comp unit has_children.
6238 If so, read the rest of the partial symbols from this comp unit.
6239 If not, there's no more debug_info for this comp unit. */
6242 struct partial_die_info *first_die;
6243 CORE_ADDR lowpc, highpc;
6245 lowpc = ((CORE_ADDR) -1);
6246 highpc = ((CORE_ADDR) 0);
6248 first_die = load_partial_dies (reader, info_ptr, 1);
6250 scan_partial_symbols (first_die, &lowpc, &highpc,
6251 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
6253 /* If we didn't find a lowpc, set it to highpc to avoid
6254 complaints from `maint check'. */
6255 if (lowpc == ((CORE_ADDR) -1))
6258 /* If the compilation unit didn't have an explicit address range,
6259 then use the information extracted from its child dies. */
6260 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
6263 best_highpc = highpc;
6266 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
6267 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
6269 end_psymtab_common (objfile, pst);
6271 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
6274 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6275 struct dwarf2_per_cu_data *iter;
6277 /* Fill in 'dependencies' here; we fill in 'users' in a
6279 pst->number_of_dependencies = len;
6281 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
6283 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
6286 pst->dependencies[i] = iter->v.psymtab;
6288 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6291 /* Get the list of files included in the current compilation unit,
6292 and build a psymtab for each of them. */
6293 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
6295 if (dwarf_read_debug)
6297 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6299 fprintf_unfiltered (gdb_stdlog,
6300 "Psymtab for %s unit @0x%x: %s - %s"
6301 ", %d global, %d static syms\n",
6302 per_cu->is_debug_types ? "type" : "comp",
6303 to_underlying (per_cu->sect_off),
6304 paddress (gdbarch, pst->textlow),
6305 paddress (gdbarch, pst->texthigh),
6306 pst->n_global_syms, pst->n_static_syms);
6310 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6311 Process compilation unit THIS_CU for a psymtab. */
6314 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
6315 int want_partial_unit,
6316 enum language pretend_language)
6318 struct process_psymtab_comp_unit_data info;
6320 /* If this compilation unit was already read in, free the
6321 cached copy in order to read it in again. This is
6322 necessary because we skipped some symbols when we first
6323 read in the compilation unit (see load_partial_dies).
6324 This problem could be avoided, but the benefit is unclear. */
6325 if (this_cu->cu != NULL)
6326 free_one_cached_comp_unit (this_cu);
6328 gdb_assert (! this_cu->is_debug_types);
6329 info.want_partial_unit = want_partial_unit;
6330 info.pretend_language = pretend_language;
6331 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
6332 process_psymtab_comp_unit_reader,
6335 /* Age out any secondary CUs. */
6336 age_cached_comp_units ();
6339 /* Reader function for build_type_psymtabs. */
6342 build_type_psymtabs_reader (const struct die_reader_specs *reader,
6343 const gdb_byte *info_ptr,
6344 struct die_info *type_unit_die,
6348 struct objfile *objfile = dwarf2_per_objfile->objfile;
6349 struct dwarf2_cu *cu = reader->cu;
6350 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6351 struct signatured_type *sig_type;
6352 struct type_unit_group *tu_group;
6353 struct attribute *attr;
6354 struct partial_die_info *first_die;
6355 CORE_ADDR lowpc, highpc;
6356 struct partial_symtab *pst;
6358 gdb_assert (data == NULL);
6359 gdb_assert (per_cu->is_debug_types);
6360 sig_type = (struct signatured_type *) per_cu;
6365 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
6366 tu_group = get_type_unit_group (cu, attr);
6368 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
6370 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
6371 cu->list_in_scope = &file_symbols;
6372 pst = create_partial_symtab (per_cu, "");
6375 first_die = load_partial_dies (reader, info_ptr, 1);
6377 lowpc = (CORE_ADDR) -1;
6378 highpc = (CORE_ADDR) 0;
6379 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
6381 end_psymtab_common (objfile, pst);
6384 /* Struct used to sort TUs by their abbreviation table offset. */
6386 struct tu_abbrev_offset
6388 struct signatured_type *sig_type;
6389 sect_offset abbrev_offset;
6392 /* Helper routine for build_type_psymtabs_1, passed to qsort. */
6395 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
6397 const struct tu_abbrev_offset * const *a
6398 = (const struct tu_abbrev_offset * const*) ap;
6399 const struct tu_abbrev_offset * const *b
6400 = (const struct tu_abbrev_offset * const*) bp;
6401 sect_offset aoff = (*a)->abbrev_offset;
6402 sect_offset boff = (*b)->abbrev_offset;
6404 return (aoff > boff) - (aoff < boff);
6407 /* Efficiently read all the type units.
6408 This does the bulk of the work for build_type_psymtabs.
6410 The efficiency is because we sort TUs by the abbrev table they use and
6411 only read each abbrev table once. In one program there are 200K TUs
6412 sharing 8K abbrev tables.
6414 The main purpose of this function is to support building the
6415 dwarf2_per_objfile->type_unit_groups table.
6416 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
6417 can collapse the search space by grouping them by stmt_list.
6418 The savings can be significant, in the same program from above the 200K TUs
6419 share 8K stmt_list tables.
6421 FUNC is expected to call get_type_unit_group, which will create the
6422 struct type_unit_group if necessary and add it to
6423 dwarf2_per_objfile->type_unit_groups. */
6426 build_type_psymtabs_1 (void)
6428 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6429 struct cleanup *cleanups;
6430 struct abbrev_table *abbrev_table;
6431 sect_offset abbrev_offset;
6432 struct tu_abbrev_offset *sorted_by_abbrev;
6435 /* It's up to the caller to not call us multiple times. */
6436 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
6438 if (dwarf2_per_objfile->n_type_units == 0)
6441 /* TUs typically share abbrev tables, and there can be way more TUs than
6442 abbrev tables. Sort by abbrev table to reduce the number of times we
6443 read each abbrev table in.
6444 Alternatives are to punt or to maintain a cache of abbrev tables.
6445 This is simpler and efficient enough for now.
6447 Later we group TUs by their DW_AT_stmt_list value (as this defines the
6448 symtab to use). Typically TUs with the same abbrev offset have the same
6449 stmt_list value too so in practice this should work well.
6451 The basic algorithm here is:
6453 sort TUs by abbrev table
6454 for each TU with same abbrev table:
6455 read abbrev table if first user
6456 read TU top level DIE
6457 [IWBN if DWO skeletons had DW_AT_stmt_list]
6460 if (dwarf_read_debug)
6461 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
6463 /* Sort in a separate table to maintain the order of all_type_units
6464 for .gdb_index: TU indices directly index all_type_units. */
6465 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
6466 dwarf2_per_objfile->n_type_units);
6467 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
6469 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
6471 sorted_by_abbrev[i].sig_type = sig_type;
6472 sorted_by_abbrev[i].abbrev_offset =
6473 read_abbrev_offset (sig_type->per_cu.section,
6474 sig_type->per_cu.sect_off);
6476 cleanups = make_cleanup (xfree, sorted_by_abbrev);
6477 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
6478 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
6480 abbrev_offset = (sect_offset) ~(unsigned) 0;
6481 abbrev_table = NULL;
6482 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
6484 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
6486 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
6488 /* Switch to the next abbrev table if necessary. */
6489 if (abbrev_table == NULL
6490 || tu->abbrev_offset != abbrev_offset)
6492 if (abbrev_table != NULL)
6494 abbrev_table_free (abbrev_table);
6495 /* Reset to NULL in case abbrev_table_read_table throws
6496 an error: abbrev_table_free_cleanup will get called. */
6497 abbrev_table = NULL;
6499 abbrev_offset = tu->abbrev_offset;
6501 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
6503 ++tu_stats->nr_uniq_abbrev_tables;
6506 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
6507 build_type_psymtabs_reader, NULL);
6510 do_cleanups (cleanups);
6513 /* Print collected type unit statistics. */
6516 print_tu_stats (void)
6518 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6520 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
6521 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
6522 dwarf2_per_objfile->n_type_units);
6523 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
6524 tu_stats->nr_uniq_abbrev_tables);
6525 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
6526 tu_stats->nr_symtabs);
6527 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
6528 tu_stats->nr_symtab_sharers);
6529 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
6530 tu_stats->nr_stmt_less_type_units);
6531 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
6532 tu_stats->nr_all_type_units_reallocs);
6535 /* Traversal function for build_type_psymtabs. */
6538 build_type_psymtab_dependencies (void **slot, void *info)
6540 struct objfile *objfile = dwarf2_per_objfile->objfile;
6541 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
6542 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
6543 struct partial_symtab *pst = per_cu->v.psymtab;
6544 int len = VEC_length (sig_type_ptr, tu_group->tus);
6545 struct signatured_type *iter;
6548 gdb_assert (len > 0);
6549 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
6551 pst->number_of_dependencies = len;
6553 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
6555 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
6558 gdb_assert (iter->per_cu.is_debug_types);
6559 pst->dependencies[i] = iter->per_cu.v.psymtab;
6560 iter->type_unit_group = tu_group;
6563 VEC_free (sig_type_ptr, tu_group->tus);
6568 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6569 Build partial symbol tables for the .debug_types comp-units. */
6572 build_type_psymtabs (struct objfile *objfile)
6574 if (! create_all_type_units (objfile))
6577 build_type_psymtabs_1 ();
6580 /* Traversal function for process_skeletonless_type_unit.
6581 Read a TU in a DWO file and build partial symbols for it. */
6584 process_skeletonless_type_unit (void **slot, void *info)
6586 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
6587 struct objfile *objfile = (struct objfile *) info;
6588 struct signatured_type find_entry, *entry;
6590 /* If this TU doesn't exist in the global table, add it and read it in. */
6592 if (dwarf2_per_objfile->signatured_types == NULL)
6594 dwarf2_per_objfile->signatured_types
6595 = allocate_signatured_type_table (objfile);
6598 find_entry.signature = dwo_unit->signature;
6599 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
6601 /* If we've already seen this type there's nothing to do. What's happening
6602 is we're doing our own version of comdat-folding here. */
6606 /* This does the job that create_all_type_units would have done for
6608 entry = add_type_unit (dwo_unit->signature, slot);
6609 fill_in_sig_entry_from_dwo_entry (objfile, entry, dwo_unit);
6612 /* This does the job that build_type_psymtabs_1 would have done. */
6613 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0,
6614 build_type_psymtabs_reader, NULL);
6619 /* Traversal function for process_skeletonless_type_units. */
6622 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
6624 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
6626 if (dwo_file->tus != NULL)
6628 htab_traverse_noresize (dwo_file->tus,
6629 process_skeletonless_type_unit, info);
6635 /* Scan all TUs of DWO files, verifying we've processed them.
6636 This is needed in case a TU was emitted without its skeleton.
6637 Note: This can't be done until we know what all the DWO files are. */
6640 process_skeletonless_type_units (struct objfile *objfile)
6642 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
6643 if (get_dwp_file () == NULL
6644 && dwarf2_per_objfile->dwo_files != NULL)
6646 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
6647 process_dwo_file_for_skeletonless_type_units,
6652 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
6655 psymtabs_addrmap_cleanup (void *o)
6657 struct objfile *objfile = (struct objfile *) o;
6659 objfile->psymtabs_addrmap = NULL;
6662 /* Compute the 'user' field for each psymtab in OBJFILE. */
6665 set_partial_user (struct objfile *objfile)
6669 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6671 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6672 struct partial_symtab *pst = per_cu->v.psymtab;
6678 for (j = 0; j < pst->number_of_dependencies; ++j)
6680 /* Set the 'user' field only if it is not already set. */
6681 if (pst->dependencies[j]->user == NULL)
6682 pst->dependencies[j]->user = pst;
6687 /* Build the partial symbol table by doing a quick pass through the
6688 .debug_info and .debug_abbrev sections. */
6691 dwarf2_build_psymtabs_hard (struct objfile *objfile)
6693 struct cleanup *back_to, *addrmap_cleanup;
6696 if (dwarf_read_debug)
6698 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
6699 objfile_name (objfile));
6702 dwarf2_per_objfile->reading_partial_symbols = 1;
6704 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
6706 /* Any cached compilation units will be linked by the per-objfile
6707 read_in_chain. Make sure to free them when we're done. */
6708 back_to = make_cleanup (free_cached_comp_units, NULL);
6710 build_type_psymtabs (objfile);
6712 create_all_comp_units (objfile);
6714 /* Create a temporary address map on a temporary obstack. We later
6715 copy this to the final obstack. */
6716 auto_obstack temp_obstack;
6717 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
6718 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
6720 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6722 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6724 process_psymtab_comp_unit (per_cu, 0, language_minimal);
6727 /* This has to wait until we read the CUs, we need the list of DWOs. */
6728 process_skeletonless_type_units (objfile);
6730 /* Now that all TUs have been processed we can fill in the dependencies. */
6731 if (dwarf2_per_objfile->type_unit_groups != NULL)
6733 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
6734 build_type_psymtab_dependencies, NULL);
6737 if (dwarf_read_debug)
6740 set_partial_user (objfile);
6742 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
6743 &objfile->objfile_obstack);
6744 discard_cleanups (addrmap_cleanup);
6746 do_cleanups (back_to);
6748 if (dwarf_read_debug)
6749 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
6750 objfile_name (objfile));
6753 /* die_reader_func for load_partial_comp_unit. */
6756 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
6757 const gdb_byte *info_ptr,
6758 struct die_info *comp_unit_die,
6762 struct dwarf2_cu *cu = reader->cu;
6764 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
6766 /* Check if comp unit has_children.
6767 If so, read the rest of the partial symbols from this comp unit.
6768 If not, there's no more debug_info for this comp unit. */
6770 load_partial_dies (reader, info_ptr, 0);
6773 /* Load the partial DIEs for a secondary CU into memory.
6774 This is also used when rereading a primary CU with load_all_dies. */
6777 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
6779 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6780 load_partial_comp_unit_reader, NULL);
6784 read_comp_units_from_section (struct objfile *objfile,
6785 struct dwarf2_section_info *section,
6786 unsigned int is_dwz,
6789 struct dwarf2_per_cu_data ***all_comp_units)
6791 const gdb_byte *info_ptr;
6792 bfd *abfd = get_section_bfd_owner (section);
6794 if (dwarf_read_debug)
6795 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
6796 get_section_name (section),
6797 get_section_file_name (section));
6799 dwarf2_read_section (objfile, section);
6801 info_ptr = section->buffer;
6803 while (info_ptr < section->buffer + section->size)
6805 unsigned int length, initial_length_size;
6806 struct dwarf2_per_cu_data *this_cu;
6808 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
6810 /* Read just enough information to find out where the next
6811 compilation unit is. */
6812 length = read_initial_length (abfd, info_ptr, &initial_length_size);
6814 /* Save the compilation unit for later lookup. */
6815 this_cu = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_cu_data);
6816 memset (this_cu, 0, sizeof (*this_cu));
6817 this_cu->sect_off = sect_off;
6818 this_cu->length = length + initial_length_size;
6819 this_cu->is_dwz = is_dwz;
6820 this_cu->objfile = objfile;
6821 this_cu->section = section;
6823 if (*n_comp_units == *n_allocated)
6826 *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *,
6827 *all_comp_units, *n_allocated);
6829 (*all_comp_units)[*n_comp_units] = this_cu;
6832 info_ptr = info_ptr + this_cu->length;
6836 /* Create a list of all compilation units in OBJFILE.
6837 This is only done for -readnow and building partial symtabs. */
6840 create_all_comp_units (struct objfile *objfile)
6844 struct dwarf2_per_cu_data **all_comp_units;
6845 struct dwz_file *dwz;
6849 all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated);
6851 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
6852 &n_allocated, &n_comp_units, &all_comp_units);
6854 dwz = dwarf2_get_dwz_file ();
6856 read_comp_units_from_section (objfile, &dwz->info, 1,
6857 &n_allocated, &n_comp_units,
6860 dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack,
6861 struct dwarf2_per_cu_data *,
6863 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
6864 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6865 xfree (all_comp_units);
6866 dwarf2_per_objfile->n_comp_units = n_comp_units;
6869 /* Process all loaded DIEs for compilation unit CU, starting at
6870 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
6871 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
6872 DW_AT_ranges). See the comments of add_partial_subprogram on how
6873 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
6876 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
6877 CORE_ADDR *highpc, int set_addrmap,
6878 struct dwarf2_cu *cu)
6880 struct partial_die_info *pdi;
6882 /* Now, march along the PDI's, descending into ones which have
6883 interesting children but skipping the children of the other ones,
6884 until we reach the end of the compilation unit. */
6890 fixup_partial_die (pdi, cu);
6892 /* Anonymous namespaces or modules have no name but have interesting
6893 children, so we need to look at them. Ditto for anonymous
6896 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
6897 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
6898 || pdi->tag == DW_TAG_imported_unit)
6902 case DW_TAG_subprogram:
6903 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
6905 case DW_TAG_constant:
6906 case DW_TAG_variable:
6907 case DW_TAG_typedef:
6908 case DW_TAG_union_type:
6909 if (!pdi->is_declaration)
6911 add_partial_symbol (pdi, cu);
6914 case DW_TAG_class_type:
6915 case DW_TAG_interface_type:
6916 case DW_TAG_structure_type:
6917 if (!pdi->is_declaration)
6919 add_partial_symbol (pdi, cu);
6921 if (cu->language == language_rust && pdi->has_children)
6922 scan_partial_symbols (pdi->die_child, lowpc, highpc,
6925 case DW_TAG_enumeration_type:
6926 if (!pdi->is_declaration)
6927 add_partial_enumeration (pdi, cu);
6929 case DW_TAG_base_type:
6930 case DW_TAG_subrange_type:
6931 /* File scope base type definitions are added to the partial
6933 add_partial_symbol (pdi, cu);
6935 case DW_TAG_namespace:
6936 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
6939 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
6941 case DW_TAG_imported_unit:
6943 struct dwarf2_per_cu_data *per_cu;
6945 /* For now we don't handle imported units in type units. */
6946 if (cu->per_cu->is_debug_types)
6948 error (_("Dwarf Error: DW_TAG_imported_unit is not"
6949 " supported in type units [in module %s]"),
6950 objfile_name (cu->objfile));
6953 per_cu = dwarf2_find_containing_comp_unit (pdi->d.sect_off,
6957 /* Go read the partial unit, if needed. */
6958 if (per_cu->v.psymtab == NULL)
6959 process_psymtab_comp_unit (per_cu, 1, cu->language);
6961 VEC_safe_push (dwarf2_per_cu_ptr,
6962 cu->per_cu->imported_symtabs, per_cu);
6965 case DW_TAG_imported_declaration:
6966 add_partial_symbol (pdi, cu);
6973 /* If the die has a sibling, skip to the sibling. */
6975 pdi = pdi->die_sibling;
6979 /* Functions used to compute the fully scoped name of a partial DIE.
6981 Normally, this is simple. For C++, the parent DIE's fully scoped
6982 name is concatenated with "::" and the partial DIE's name.
6983 Enumerators are an exception; they use the scope of their parent
6984 enumeration type, i.e. the name of the enumeration type is not
6985 prepended to the enumerator.
6987 There are two complexities. One is DW_AT_specification; in this
6988 case "parent" means the parent of the target of the specification,
6989 instead of the direct parent of the DIE. The other is compilers
6990 which do not emit DW_TAG_namespace; in this case we try to guess
6991 the fully qualified name of structure types from their members'
6992 linkage names. This must be done using the DIE's children rather
6993 than the children of any DW_AT_specification target. We only need
6994 to do this for structures at the top level, i.e. if the target of
6995 any DW_AT_specification (if any; otherwise the DIE itself) does not
6998 /* Compute the scope prefix associated with PDI's parent, in
6999 compilation unit CU. The result will be allocated on CU's
7000 comp_unit_obstack, or a copy of the already allocated PDI->NAME
7001 field. NULL is returned if no prefix is necessary. */
7003 partial_die_parent_scope (struct partial_die_info *pdi,
7004 struct dwarf2_cu *cu)
7006 const char *grandparent_scope;
7007 struct partial_die_info *parent, *real_pdi;
7009 /* We need to look at our parent DIE; if we have a DW_AT_specification,
7010 then this means the parent of the specification DIE. */
7013 while (real_pdi->has_specification)
7014 real_pdi = find_partial_die (real_pdi->spec_offset,
7015 real_pdi->spec_is_dwz, cu);
7017 parent = real_pdi->die_parent;
7021 if (parent->scope_set)
7022 return parent->scope;
7024 fixup_partial_die (parent, cu);
7026 grandparent_scope = partial_die_parent_scope (parent, cu);
7028 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
7029 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
7030 Work around this problem here. */
7031 if (cu->language == language_cplus
7032 && parent->tag == DW_TAG_namespace
7033 && strcmp (parent->name, "::") == 0
7034 && grandparent_scope == NULL)
7036 parent->scope = NULL;
7037 parent->scope_set = 1;
7041 if (pdi->tag == DW_TAG_enumerator)
7042 /* Enumerators should not get the name of the enumeration as a prefix. */
7043 parent->scope = grandparent_scope;
7044 else if (parent->tag == DW_TAG_namespace
7045 || parent->tag == DW_TAG_module
7046 || parent->tag == DW_TAG_structure_type
7047 || parent->tag == DW_TAG_class_type
7048 || parent->tag == DW_TAG_interface_type
7049 || parent->tag == DW_TAG_union_type
7050 || parent->tag == DW_TAG_enumeration_type)
7052 if (grandparent_scope == NULL)
7053 parent->scope = parent->name;
7055 parent->scope = typename_concat (&cu->comp_unit_obstack,
7057 parent->name, 0, cu);
7061 /* FIXME drow/2004-04-01: What should we be doing with
7062 function-local names? For partial symbols, we should probably be
7064 complaint (&symfile_complaints,
7065 _("unhandled containing DIE tag %d for DIE at %d"),
7066 parent->tag, to_underlying (pdi->sect_off));
7067 parent->scope = grandparent_scope;
7070 parent->scope_set = 1;
7071 return parent->scope;
7074 /* Return the fully scoped name associated with PDI, from compilation unit
7075 CU. The result will be allocated with malloc. */
7078 partial_die_full_name (struct partial_die_info *pdi,
7079 struct dwarf2_cu *cu)
7081 const char *parent_scope;
7083 /* If this is a template instantiation, we can not work out the
7084 template arguments from partial DIEs. So, unfortunately, we have
7085 to go through the full DIEs. At least any work we do building
7086 types here will be reused if full symbols are loaded later. */
7087 if (pdi->has_template_arguments)
7089 fixup_partial_die (pdi, cu);
7091 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
7093 struct die_info *die;
7094 struct attribute attr;
7095 struct dwarf2_cu *ref_cu = cu;
7097 /* DW_FORM_ref_addr is using section offset. */
7098 attr.name = (enum dwarf_attribute) 0;
7099 attr.form = DW_FORM_ref_addr;
7100 attr.u.unsnd = to_underlying (pdi->sect_off);
7101 die = follow_die_ref (NULL, &attr, &ref_cu);
7103 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
7107 parent_scope = partial_die_parent_scope (pdi, cu);
7108 if (parent_scope == NULL)
7111 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
7115 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
7117 struct objfile *objfile = cu->objfile;
7118 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7120 const char *actual_name = NULL;
7122 char *built_actual_name;
7124 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7126 built_actual_name = partial_die_full_name (pdi, cu);
7127 if (built_actual_name != NULL)
7128 actual_name = built_actual_name;
7130 if (actual_name == NULL)
7131 actual_name = pdi->name;
7135 case DW_TAG_subprogram:
7136 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
7137 if (pdi->is_external || cu->language == language_ada)
7139 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
7140 of the global scope. But in Ada, we want to be able to access
7141 nested procedures globally. So all Ada subprograms are stored
7142 in the global scope. */
7143 add_psymbol_to_list (actual_name, strlen (actual_name),
7144 built_actual_name != NULL,
7145 VAR_DOMAIN, LOC_BLOCK,
7146 &objfile->global_psymbols,
7147 addr, cu->language, objfile);
7151 add_psymbol_to_list (actual_name, strlen (actual_name),
7152 built_actual_name != NULL,
7153 VAR_DOMAIN, LOC_BLOCK,
7154 &objfile->static_psymbols,
7155 addr, cu->language, objfile);
7158 if (pdi->main_subprogram && actual_name != NULL)
7159 set_objfile_main_name (objfile, actual_name, cu->language);
7161 case DW_TAG_constant:
7163 struct psymbol_allocation_list *list;
7165 if (pdi->is_external)
7166 list = &objfile->global_psymbols;
7168 list = &objfile->static_psymbols;
7169 add_psymbol_to_list (actual_name, strlen (actual_name),
7170 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
7171 list, 0, cu->language, objfile);
7174 case DW_TAG_variable:
7176 addr = decode_locdesc (pdi->d.locdesc, cu);
7180 && !dwarf2_per_objfile->has_section_at_zero)
7182 /* A global or static variable may also have been stripped
7183 out by the linker if unused, in which case its address
7184 will be nullified; do not add such variables into partial
7185 symbol table then. */
7187 else if (pdi->is_external)
7190 Don't enter into the minimal symbol tables as there is
7191 a minimal symbol table entry from the ELF symbols already.
7192 Enter into partial symbol table if it has a location
7193 descriptor or a type.
7194 If the location descriptor is missing, new_symbol will create
7195 a LOC_UNRESOLVED symbol, the address of the variable will then
7196 be determined from the minimal symbol table whenever the variable
7198 The address for the partial symbol table entry is not
7199 used by GDB, but it comes in handy for debugging partial symbol
7202 if (pdi->d.locdesc || pdi->has_type)
7203 add_psymbol_to_list (actual_name, strlen (actual_name),
7204 built_actual_name != NULL,
7205 VAR_DOMAIN, LOC_STATIC,
7206 &objfile->global_psymbols,
7208 cu->language, objfile);
7212 int has_loc = pdi->d.locdesc != NULL;
7214 /* Static Variable. Skip symbols whose value we cannot know (those
7215 without location descriptors or constant values). */
7216 if (!has_loc && !pdi->has_const_value)
7218 xfree (built_actual_name);
7222 add_psymbol_to_list (actual_name, strlen (actual_name),
7223 built_actual_name != NULL,
7224 VAR_DOMAIN, LOC_STATIC,
7225 &objfile->static_psymbols,
7226 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
7227 cu->language, objfile);
7230 case DW_TAG_typedef:
7231 case DW_TAG_base_type:
7232 case DW_TAG_subrange_type:
7233 add_psymbol_to_list (actual_name, strlen (actual_name),
7234 built_actual_name != NULL,
7235 VAR_DOMAIN, LOC_TYPEDEF,
7236 &objfile->static_psymbols,
7237 0, cu->language, objfile);
7239 case DW_TAG_imported_declaration:
7240 case DW_TAG_namespace:
7241 add_psymbol_to_list (actual_name, strlen (actual_name),
7242 built_actual_name != NULL,
7243 VAR_DOMAIN, LOC_TYPEDEF,
7244 &objfile->global_psymbols,
7245 0, cu->language, objfile);
7248 add_psymbol_to_list (actual_name, strlen (actual_name),
7249 built_actual_name != NULL,
7250 MODULE_DOMAIN, LOC_TYPEDEF,
7251 &objfile->global_psymbols,
7252 0, cu->language, objfile);
7254 case DW_TAG_class_type:
7255 case DW_TAG_interface_type:
7256 case DW_TAG_structure_type:
7257 case DW_TAG_union_type:
7258 case DW_TAG_enumeration_type:
7259 /* Skip external references. The DWARF standard says in the section
7260 about "Structure, Union, and Class Type Entries": "An incomplete
7261 structure, union or class type is represented by a structure,
7262 union or class entry that does not have a byte size attribute
7263 and that has a DW_AT_declaration attribute." */
7264 if (!pdi->has_byte_size && pdi->is_declaration)
7266 xfree (built_actual_name);
7270 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
7271 static vs. global. */
7272 add_psymbol_to_list (actual_name, strlen (actual_name),
7273 built_actual_name != NULL,
7274 STRUCT_DOMAIN, LOC_TYPEDEF,
7275 cu->language == language_cplus
7276 ? &objfile->global_psymbols
7277 : &objfile->static_psymbols,
7278 0, cu->language, objfile);
7281 case DW_TAG_enumerator:
7282 add_psymbol_to_list (actual_name, strlen (actual_name),
7283 built_actual_name != NULL,
7284 VAR_DOMAIN, LOC_CONST,
7285 cu->language == language_cplus
7286 ? &objfile->global_psymbols
7287 : &objfile->static_psymbols,
7288 0, cu->language, objfile);
7294 xfree (built_actual_name);
7297 /* Read a partial die corresponding to a namespace; also, add a symbol
7298 corresponding to that namespace to the symbol table. NAMESPACE is
7299 the name of the enclosing namespace. */
7302 add_partial_namespace (struct partial_die_info *pdi,
7303 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7304 int set_addrmap, struct dwarf2_cu *cu)
7306 /* Add a symbol for the namespace. */
7308 add_partial_symbol (pdi, cu);
7310 /* Now scan partial symbols in that namespace. */
7312 if (pdi->has_children)
7313 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7316 /* Read a partial die corresponding to a Fortran module. */
7319 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
7320 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
7322 /* Add a symbol for the namespace. */
7324 add_partial_symbol (pdi, cu);
7326 /* Now scan partial symbols in that module. */
7328 if (pdi->has_children)
7329 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7332 /* Read a partial die corresponding to a subprogram and create a partial
7333 symbol for that subprogram. When the CU language allows it, this
7334 routine also defines a partial symbol for each nested subprogram
7335 that this subprogram contains. If SET_ADDRMAP is true, record the
7336 covered ranges in the addrmap. Set *LOWPC and *HIGHPC to the lowest
7337 and highest PC values found in PDI.
7339 PDI may also be a lexical block, in which case we simply search
7340 recursively for subprograms defined inside that lexical block.
7341 Again, this is only performed when the CU language allows this
7342 type of definitions. */
7345 add_partial_subprogram (struct partial_die_info *pdi,
7346 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7347 int set_addrmap, struct dwarf2_cu *cu)
7349 if (pdi->tag == DW_TAG_subprogram)
7351 if (pdi->has_pc_info)
7353 if (pdi->lowpc < *lowpc)
7354 *lowpc = pdi->lowpc;
7355 if (pdi->highpc > *highpc)
7356 *highpc = pdi->highpc;
7359 struct objfile *objfile = cu->objfile;
7360 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7365 baseaddr = ANOFFSET (objfile->section_offsets,
7366 SECT_OFF_TEXT (objfile));
7367 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7368 pdi->lowpc + baseaddr);
7369 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7370 pdi->highpc + baseaddr);
7371 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
7372 cu->per_cu->v.psymtab);
7376 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
7378 if (!pdi->is_declaration)
7379 /* Ignore subprogram DIEs that do not have a name, they are
7380 illegal. Do not emit a complaint at this point, we will
7381 do so when we convert this psymtab into a symtab. */
7383 add_partial_symbol (pdi, cu);
7387 if (! pdi->has_children)
7390 if (cu->language == language_ada)
7392 pdi = pdi->die_child;
7395 fixup_partial_die (pdi, cu);
7396 if (pdi->tag == DW_TAG_subprogram
7397 || pdi->tag == DW_TAG_lexical_block)
7398 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
7399 pdi = pdi->die_sibling;
7404 /* Read a partial die corresponding to an enumeration type. */
7407 add_partial_enumeration (struct partial_die_info *enum_pdi,
7408 struct dwarf2_cu *cu)
7410 struct partial_die_info *pdi;
7412 if (enum_pdi->name != NULL)
7413 add_partial_symbol (enum_pdi, cu);
7415 pdi = enum_pdi->die_child;
7418 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
7419 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
7421 add_partial_symbol (pdi, cu);
7422 pdi = pdi->die_sibling;
7426 /* Return the initial uleb128 in the die at INFO_PTR. */
7429 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
7431 unsigned int bytes_read;
7433 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7436 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
7437 Return the corresponding abbrev, or NULL if the number is zero (indicating
7438 an empty DIE). In either case *BYTES_READ will be set to the length of
7439 the initial number. */
7441 static struct abbrev_info *
7442 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
7443 struct dwarf2_cu *cu)
7445 bfd *abfd = cu->objfile->obfd;
7446 unsigned int abbrev_number;
7447 struct abbrev_info *abbrev;
7449 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
7451 if (abbrev_number == 0)
7454 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
7457 error (_("Dwarf Error: Could not find abbrev number %d in %s"
7458 " at offset 0x%x [in module %s]"),
7459 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
7460 to_underlying (cu->header.sect_off), bfd_get_filename (abfd));
7466 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7467 Returns a pointer to the end of a series of DIEs, terminated by an empty
7468 DIE. Any children of the skipped DIEs will also be skipped. */
7470 static const gdb_byte *
7471 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
7473 struct dwarf2_cu *cu = reader->cu;
7474 struct abbrev_info *abbrev;
7475 unsigned int bytes_read;
7479 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
7481 return info_ptr + bytes_read;
7483 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
7487 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7488 INFO_PTR should point just after the initial uleb128 of a DIE, and the
7489 abbrev corresponding to that skipped uleb128 should be passed in
7490 ABBREV. Returns a pointer to this DIE's sibling, skipping any
7493 static const gdb_byte *
7494 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
7495 struct abbrev_info *abbrev)
7497 unsigned int bytes_read;
7498 struct attribute attr;
7499 bfd *abfd = reader->abfd;
7500 struct dwarf2_cu *cu = reader->cu;
7501 const gdb_byte *buffer = reader->buffer;
7502 const gdb_byte *buffer_end = reader->buffer_end;
7503 unsigned int form, i;
7505 for (i = 0; i < abbrev->num_attrs; i++)
7507 /* The only abbrev we care about is DW_AT_sibling. */
7508 if (abbrev->attrs[i].name == DW_AT_sibling)
7510 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
7511 if (attr.form == DW_FORM_ref_addr)
7512 complaint (&symfile_complaints,
7513 _("ignoring absolute DW_AT_sibling"));
7516 sect_offset off = dwarf2_get_ref_die_offset (&attr);
7517 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
7519 if (sibling_ptr < info_ptr)
7520 complaint (&symfile_complaints,
7521 _("DW_AT_sibling points backwards"));
7522 else if (sibling_ptr > reader->buffer_end)
7523 dwarf2_section_buffer_overflow_complaint (reader->die_section);
7529 /* If it isn't DW_AT_sibling, skip this attribute. */
7530 form = abbrev->attrs[i].form;
7534 case DW_FORM_ref_addr:
7535 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
7536 and later it is offset sized. */
7537 if (cu->header.version == 2)
7538 info_ptr += cu->header.addr_size;
7540 info_ptr += cu->header.offset_size;
7542 case DW_FORM_GNU_ref_alt:
7543 info_ptr += cu->header.offset_size;
7546 info_ptr += cu->header.addr_size;
7553 case DW_FORM_flag_present:
7554 case DW_FORM_implicit_const:
7566 case DW_FORM_ref_sig8:
7569 case DW_FORM_data16:
7572 case DW_FORM_string:
7573 read_direct_string (abfd, info_ptr, &bytes_read);
7574 info_ptr += bytes_read;
7576 case DW_FORM_sec_offset:
7578 case DW_FORM_GNU_strp_alt:
7579 info_ptr += cu->header.offset_size;
7581 case DW_FORM_exprloc:
7583 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7584 info_ptr += bytes_read;
7586 case DW_FORM_block1:
7587 info_ptr += 1 + read_1_byte (abfd, info_ptr);
7589 case DW_FORM_block2:
7590 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
7592 case DW_FORM_block4:
7593 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
7597 case DW_FORM_ref_udata:
7598 case DW_FORM_GNU_addr_index:
7599 case DW_FORM_GNU_str_index:
7600 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
7602 case DW_FORM_indirect:
7603 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7604 info_ptr += bytes_read;
7605 /* We need to continue parsing from here, so just go back to
7607 goto skip_attribute;
7610 error (_("Dwarf Error: Cannot handle %s "
7611 "in DWARF reader [in module %s]"),
7612 dwarf_form_name (form),
7613 bfd_get_filename (abfd));
7617 if (abbrev->has_children)
7618 return skip_children (reader, info_ptr);
7623 /* Locate ORIG_PDI's sibling.
7624 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
7626 static const gdb_byte *
7627 locate_pdi_sibling (const struct die_reader_specs *reader,
7628 struct partial_die_info *orig_pdi,
7629 const gdb_byte *info_ptr)
7631 /* Do we know the sibling already? */
7633 if (orig_pdi->sibling)
7634 return orig_pdi->sibling;
7636 /* Are there any children to deal with? */
7638 if (!orig_pdi->has_children)
7641 /* Skip the children the long way. */
7643 return skip_children (reader, info_ptr);
7646 /* Expand this partial symbol table into a full symbol table. SELF is
7650 dwarf2_read_symtab (struct partial_symtab *self,
7651 struct objfile *objfile)
7655 warning (_("bug: psymtab for %s is already read in."),
7662 printf_filtered (_("Reading in symbols for %s..."),
7664 gdb_flush (gdb_stdout);
7667 /* Restore our global data. */
7669 = (struct dwarf2_per_objfile *) objfile_data (objfile,
7670 dwarf2_objfile_data_key);
7672 /* If this psymtab is constructed from a debug-only objfile, the
7673 has_section_at_zero flag will not necessarily be correct. We
7674 can get the correct value for this flag by looking at the data
7675 associated with the (presumably stripped) associated objfile. */
7676 if (objfile->separate_debug_objfile_backlink)
7678 struct dwarf2_per_objfile *dpo_backlink
7679 = ((struct dwarf2_per_objfile *)
7680 objfile_data (objfile->separate_debug_objfile_backlink,
7681 dwarf2_objfile_data_key));
7683 dwarf2_per_objfile->has_section_at_zero
7684 = dpo_backlink->has_section_at_zero;
7687 dwarf2_per_objfile->reading_partial_symbols = 0;
7689 psymtab_to_symtab_1 (self);
7691 /* Finish up the debug error message. */
7693 printf_filtered (_("done.\n"));
7696 process_cu_includes ();
7699 /* Reading in full CUs. */
7701 /* Add PER_CU to the queue. */
7704 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
7705 enum language pretend_language)
7707 struct dwarf2_queue_item *item;
7710 item = XNEW (struct dwarf2_queue_item);
7711 item->per_cu = per_cu;
7712 item->pretend_language = pretend_language;
7715 if (dwarf2_queue == NULL)
7716 dwarf2_queue = item;
7718 dwarf2_queue_tail->next = item;
7720 dwarf2_queue_tail = item;
7723 /* If PER_CU is not yet queued, add it to the queue.
7724 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
7726 The result is non-zero if PER_CU was queued, otherwise the result is zero
7727 meaning either PER_CU is already queued or it is already loaded.
7729 N.B. There is an invariant here that if a CU is queued then it is loaded.
7730 The caller is required to load PER_CU if we return non-zero. */
7733 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
7734 struct dwarf2_per_cu_data *per_cu,
7735 enum language pretend_language)
7737 /* We may arrive here during partial symbol reading, if we need full
7738 DIEs to process an unusual case (e.g. template arguments). Do
7739 not queue PER_CU, just tell our caller to load its DIEs. */
7740 if (dwarf2_per_objfile->reading_partial_symbols)
7742 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
7747 /* Mark the dependence relation so that we don't flush PER_CU
7749 if (dependent_cu != NULL)
7750 dwarf2_add_dependence (dependent_cu, per_cu);
7752 /* If it's already on the queue, we have nothing to do. */
7756 /* If the compilation unit is already loaded, just mark it as
7758 if (per_cu->cu != NULL)
7760 per_cu->cu->last_used = 0;
7764 /* Add it to the queue. */
7765 queue_comp_unit (per_cu, pretend_language);
7770 /* Process the queue. */
7773 process_queue (void)
7775 struct dwarf2_queue_item *item, *next_item;
7777 if (dwarf_read_debug)
7779 fprintf_unfiltered (gdb_stdlog,
7780 "Expanding one or more symtabs of objfile %s ...\n",
7781 objfile_name (dwarf2_per_objfile->objfile));
7784 /* The queue starts out with one item, but following a DIE reference
7785 may load a new CU, adding it to the end of the queue. */
7786 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
7788 if ((dwarf2_per_objfile->using_index
7789 ? !item->per_cu->v.quick->compunit_symtab
7790 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
7791 /* Skip dummy CUs. */
7792 && item->per_cu->cu != NULL)
7794 struct dwarf2_per_cu_data *per_cu = item->per_cu;
7795 unsigned int debug_print_threshold;
7798 if (per_cu->is_debug_types)
7800 struct signatured_type *sig_type =
7801 (struct signatured_type *) per_cu;
7803 sprintf (buf, "TU %s at offset 0x%x",
7804 hex_string (sig_type->signature),
7805 to_underlying (per_cu->sect_off));
7806 /* There can be 100s of TUs.
7807 Only print them in verbose mode. */
7808 debug_print_threshold = 2;
7812 sprintf (buf, "CU at offset 0x%x",
7813 to_underlying (per_cu->sect_off));
7814 debug_print_threshold = 1;
7817 if (dwarf_read_debug >= debug_print_threshold)
7818 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
7820 if (per_cu->is_debug_types)
7821 process_full_type_unit (per_cu, item->pretend_language);
7823 process_full_comp_unit (per_cu, item->pretend_language);
7825 if (dwarf_read_debug >= debug_print_threshold)
7826 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
7829 item->per_cu->queued = 0;
7830 next_item = item->next;
7834 dwarf2_queue_tail = NULL;
7836 if (dwarf_read_debug)
7838 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7839 objfile_name (dwarf2_per_objfile->objfile));
7843 /* Free all allocated queue entries. This function only releases anything if
7844 an error was thrown; if the queue was processed then it would have been
7845 freed as we went along. */
7848 dwarf2_release_queue (void *dummy)
7850 struct dwarf2_queue_item *item, *last;
7852 item = dwarf2_queue;
7855 /* Anything still marked queued is likely to be in an
7856 inconsistent state, so discard it. */
7857 if (item->per_cu->queued)
7859 if (item->per_cu->cu != NULL)
7860 free_one_cached_comp_unit (item->per_cu);
7861 item->per_cu->queued = 0;
7869 dwarf2_queue = dwarf2_queue_tail = NULL;
7872 /* Read in full symbols for PST, and anything it depends on. */
7875 psymtab_to_symtab_1 (struct partial_symtab *pst)
7877 struct dwarf2_per_cu_data *per_cu;
7883 for (i = 0; i < pst->number_of_dependencies; i++)
7884 if (!pst->dependencies[i]->readin
7885 && pst->dependencies[i]->user == NULL)
7887 /* Inform about additional files that need to be read in. */
7890 /* FIXME: i18n: Need to make this a single string. */
7891 fputs_filtered (" ", gdb_stdout);
7893 fputs_filtered ("and ", gdb_stdout);
7895 printf_filtered ("%s...", pst->dependencies[i]->filename);
7896 wrap_here (""); /* Flush output. */
7897 gdb_flush (gdb_stdout);
7899 psymtab_to_symtab_1 (pst->dependencies[i]);
7902 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
7906 /* It's an include file, no symbols to read for it.
7907 Everything is in the parent symtab. */
7912 dw2_do_instantiate_symtab (per_cu);
7915 /* Trivial hash function for die_info: the hash value of a DIE
7916 is its offset in .debug_info for this objfile. */
7919 die_hash (const void *item)
7921 const struct die_info *die = (const struct die_info *) item;
7923 return to_underlying (die->sect_off);
7926 /* Trivial comparison function for die_info structures: two DIEs
7927 are equal if they have the same offset. */
7930 die_eq (const void *item_lhs, const void *item_rhs)
7932 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
7933 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
7935 return die_lhs->sect_off == die_rhs->sect_off;
7938 /* die_reader_func for load_full_comp_unit.
7939 This is identical to read_signatured_type_reader,
7940 but is kept separate for now. */
7943 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7944 const gdb_byte *info_ptr,
7945 struct die_info *comp_unit_die,
7949 struct dwarf2_cu *cu = reader->cu;
7950 enum language *language_ptr = (enum language *) data;
7952 gdb_assert (cu->die_hash == NULL);
7954 htab_create_alloc_ex (cu->header.length / 12,
7958 &cu->comp_unit_obstack,
7959 hashtab_obstack_allocate,
7960 dummy_obstack_deallocate);
7963 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7964 &info_ptr, comp_unit_die);
7965 cu->dies = comp_unit_die;
7966 /* comp_unit_die is not stored in die_hash, no need. */
7968 /* We try not to read any attributes in this function, because not
7969 all CUs needed for references have been loaded yet, and symbol
7970 table processing isn't initialized. But we have to set the CU language,
7971 or we won't be able to build types correctly.
7972 Similarly, if we do not read the producer, we can not apply
7973 producer-specific interpretation. */
7974 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
7977 /* Load the DIEs associated with PER_CU into memory. */
7980 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
7981 enum language pretend_language)
7983 gdb_assert (! this_cu->is_debug_types);
7985 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7986 load_full_comp_unit_reader, &pretend_language);
7989 /* Add a DIE to the delayed physname list. */
7992 add_to_method_list (struct type *type, int fnfield_index, int index,
7993 const char *name, struct die_info *die,
7994 struct dwarf2_cu *cu)
7996 struct delayed_method_info mi;
7998 mi.fnfield_index = fnfield_index;
8002 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
8005 /* A cleanup for freeing the delayed method list. */
8008 free_delayed_list (void *ptr)
8010 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
8011 if (cu->method_list != NULL)
8013 VEC_free (delayed_method_info, cu->method_list);
8014 cu->method_list = NULL;
8018 /* Compute the physnames of any methods on the CU's method list.
8020 The computation of method physnames is delayed in order to avoid the
8021 (bad) condition that one of the method's formal parameters is of an as yet
8025 compute_delayed_physnames (struct dwarf2_cu *cu)
8028 struct delayed_method_info *mi;
8029 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
8031 const char *physname;
8032 struct fn_fieldlist *fn_flp
8033 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
8034 physname = dwarf2_physname (mi->name, mi->die, cu);
8035 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi->index)
8036 = physname ? physname : "";
8040 /* Go objects should be embedded in a DW_TAG_module DIE,
8041 and it's not clear if/how imported objects will appear.
8042 To keep Go support simple until that's worked out,
8043 go back through what we've read and create something usable.
8044 We could do this while processing each DIE, and feels kinda cleaner,
8045 but that way is more invasive.
8046 This is to, for example, allow the user to type "p var" or "b main"
8047 without having to specify the package name, and allow lookups
8048 of module.object to work in contexts that use the expression
8052 fixup_go_packaging (struct dwarf2_cu *cu)
8054 char *package_name = NULL;
8055 struct pending *list;
8058 for (list = global_symbols; list != NULL; list = list->next)
8060 for (i = 0; i < list->nsyms; ++i)
8062 struct symbol *sym = list->symbol[i];
8064 if (SYMBOL_LANGUAGE (sym) == language_go
8065 && SYMBOL_CLASS (sym) == LOC_BLOCK)
8067 char *this_package_name = go_symbol_package_name (sym);
8069 if (this_package_name == NULL)
8071 if (package_name == NULL)
8072 package_name = this_package_name;
8075 if (strcmp (package_name, this_package_name) != 0)
8076 complaint (&symfile_complaints,
8077 _("Symtab %s has objects from two different Go packages: %s and %s"),
8078 (symbol_symtab (sym) != NULL
8079 ? symtab_to_filename_for_display
8080 (symbol_symtab (sym))
8081 : objfile_name (cu->objfile)),
8082 this_package_name, package_name);
8083 xfree (this_package_name);
8089 if (package_name != NULL)
8091 struct objfile *objfile = cu->objfile;
8092 const char *saved_package_name
8093 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
8095 strlen (package_name));
8096 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
8097 saved_package_name);
8100 TYPE_TAG_NAME (type) = TYPE_NAME (type);
8102 sym = allocate_symbol (objfile);
8103 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
8104 SYMBOL_SET_NAMES (sym, saved_package_name,
8105 strlen (saved_package_name), 0, objfile);
8106 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
8107 e.g., "main" finds the "main" module and not C's main(). */
8108 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
8109 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
8110 SYMBOL_TYPE (sym) = type;
8112 add_symbol_to_list (sym, &global_symbols);
8114 xfree (package_name);
8118 /* Return the symtab for PER_CU. This works properly regardless of
8119 whether we're using the index or psymtabs. */
8121 static struct compunit_symtab *
8122 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
8124 return (dwarf2_per_objfile->using_index
8125 ? per_cu->v.quick->compunit_symtab
8126 : per_cu->v.psymtab->compunit_symtab);
8129 /* A helper function for computing the list of all symbol tables
8130 included by PER_CU. */
8133 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
8134 htab_t all_children, htab_t all_type_symtabs,
8135 struct dwarf2_per_cu_data *per_cu,
8136 struct compunit_symtab *immediate_parent)
8140 struct compunit_symtab *cust;
8141 struct dwarf2_per_cu_data *iter;
8143 slot = htab_find_slot (all_children, per_cu, INSERT);
8146 /* This inclusion and its children have been processed. */
8151 /* Only add a CU if it has a symbol table. */
8152 cust = get_compunit_symtab (per_cu);
8155 /* If this is a type unit only add its symbol table if we haven't
8156 seen it yet (type unit per_cu's can share symtabs). */
8157 if (per_cu->is_debug_types)
8159 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
8163 VEC_safe_push (compunit_symtab_ptr, *result, cust);
8164 if (cust->user == NULL)
8165 cust->user = immediate_parent;
8170 VEC_safe_push (compunit_symtab_ptr, *result, cust);
8171 if (cust->user == NULL)
8172 cust->user = immediate_parent;
8177 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
8180 recursively_compute_inclusions (result, all_children,
8181 all_type_symtabs, iter, cust);
8185 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
8189 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
8191 gdb_assert (! per_cu->is_debug_types);
8193 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
8196 struct dwarf2_per_cu_data *per_cu_iter;
8197 struct compunit_symtab *compunit_symtab_iter;
8198 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
8199 htab_t all_children, all_type_symtabs;
8200 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
8202 /* If we don't have a symtab, we can just skip this case. */
8206 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
8207 NULL, xcalloc, xfree);
8208 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
8209 NULL, xcalloc, xfree);
8212 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
8216 recursively_compute_inclusions (&result_symtabs, all_children,
8217 all_type_symtabs, per_cu_iter,
8221 /* Now we have a transitive closure of all the included symtabs. */
8222 len = VEC_length (compunit_symtab_ptr, result_symtabs);
8224 = XOBNEWVEC (&dwarf2_per_objfile->objfile->objfile_obstack,
8225 struct compunit_symtab *, len + 1);
8227 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
8228 compunit_symtab_iter);
8230 cust->includes[ix] = compunit_symtab_iter;
8231 cust->includes[len] = NULL;
8233 VEC_free (compunit_symtab_ptr, result_symtabs);
8234 htab_delete (all_children);
8235 htab_delete (all_type_symtabs);
8239 /* Compute the 'includes' field for the symtabs of all the CUs we just
8243 process_cu_includes (void)
8246 struct dwarf2_per_cu_data *iter;
8249 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
8253 if (! iter->is_debug_types)
8254 compute_compunit_symtab_includes (iter);
8257 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
8260 /* Generate full symbol information for PER_CU, whose DIEs have
8261 already been loaded into memory. */
8264 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
8265 enum language pretend_language)
8267 struct dwarf2_cu *cu = per_cu->cu;
8268 struct objfile *objfile = per_cu->objfile;
8269 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8270 CORE_ADDR lowpc, highpc;
8271 struct compunit_symtab *cust;
8272 struct cleanup *back_to, *delayed_list_cleanup;
8274 struct block *static_block;
8277 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8280 back_to = make_cleanup (really_free_pendings, NULL);
8281 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
8283 cu->list_in_scope = &file_symbols;
8285 cu->language = pretend_language;
8286 cu->language_defn = language_def (cu->language);
8288 /* Do line number decoding in read_file_scope () */
8289 process_die (cu->dies, cu);
8291 /* For now fudge the Go package. */
8292 if (cu->language == language_go)
8293 fixup_go_packaging (cu);
8295 /* Now that we have processed all the DIEs in the CU, all the types
8296 should be complete, and it should now be safe to compute all of the
8298 compute_delayed_physnames (cu);
8299 do_cleanups (delayed_list_cleanup);
8301 /* Some compilers don't define a DW_AT_high_pc attribute for the
8302 compilation unit. If the DW_AT_high_pc is missing, synthesize
8303 it, by scanning the DIE's below the compilation unit. */
8304 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
8306 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
8307 static_block = end_symtab_get_static_block (addr, 0, 1);
8309 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
8310 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
8311 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
8312 addrmap to help ensure it has an accurate map of pc values belonging to
8314 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
8316 cust = end_symtab_from_static_block (static_block,
8317 SECT_OFF_TEXT (objfile), 0);
8321 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
8323 /* Set symtab language to language from DW_AT_language. If the
8324 compilation is from a C file generated by language preprocessors, do
8325 not set the language if it was already deduced by start_subfile. */
8326 if (!(cu->language == language_c
8327 && COMPUNIT_FILETABS (cust)->language != language_unknown))
8328 COMPUNIT_FILETABS (cust)->language = cu->language;
8330 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
8331 produce DW_AT_location with location lists but it can be possibly
8332 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
8333 there were bugs in prologue debug info, fixed later in GCC-4.5
8334 by "unwind info for epilogues" patch (which is not directly related).
8336 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
8337 needed, it would be wrong due to missing DW_AT_producer there.
8339 Still one can confuse GDB by using non-standard GCC compilation
8340 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
8342 if (cu->has_loclist && gcc_4_minor >= 5)
8343 cust->locations_valid = 1;
8345 if (gcc_4_minor >= 5)
8346 cust->epilogue_unwind_valid = 1;
8348 cust->call_site_htab = cu->call_site_htab;
8351 if (dwarf2_per_objfile->using_index)
8352 per_cu->v.quick->compunit_symtab = cust;
8355 struct partial_symtab *pst = per_cu->v.psymtab;
8356 pst->compunit_symtab = cust;
8360 /* Push it for inclusion processing later. */
8361 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
8363 do_cleanups (back_to);
8366 /* Generate full symbol information for type unit PER_CU, whose DIEs have
8367 already been loaded into memory. */
8370 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
8371 enum language pretend_language)
8373 struct dwarf2_cu *cu = per_cu->cu;
8374 struct objfile *objfile = per_cu->objfile;
8375 struct compunit_symtab *cust;
8376 struct cleanup *back_to, *delayed_list_cleanup;
8377 struct signatured_type *sig_type;
8379 gdb_assert (per_cu->is_debug_types);
8380 sig_type = (struct signatured_type *) per_cu;
8383 back_to = make_cleanup (really_free_pendings, NULL);
8384 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
8386 cu->list_in_scope = &file_symbols;
8388 cu->language = pretend_language;
8389 cu->language_defn = language_def (cu->language);
8391 /* The symbol tables are set up in read_type_unit_scope. */
8392 process_die (cu->dies, cu);
8394 /* For now fudge the Go package. */
8395 if (cu->language == language_go)
8396 fixup_go_packaging (cu);
8398 /* Now that we have processed all the DIEs in the CU, all the types
8399 should be complete, and it should now be safe to compute all of the
8401 compute_delayed_physnames (cu);
8402 do_cleanups (delayed_list_cleanup);
8404 /* TUs share symbol tables.
8405 If this is the first TU to use this symtab, complete the construction
8406 of it with end_expandable_symtab. Otherwise, complete the addition of
8407 this TU's symbols to the existing symtab. */
8408 if (sig_type->type_unit_group->compunit_symtab == NULL)
8410 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
8411 sig_type->type_unit_group->compunit_symtab = cust;
8415 /* Set symtab language to language from DW_AT_language. If the
8416 compilation is from a C file generated by language preprocessors,
8417 do not set the language if it was already deduced by
8419 if (!(cu->language == language_c
8420 && COMPUNIT_FILETABS (cust)->language != language_c))
8421 COMPUNIT_FILETABS (cust)->language = cu->language;
8426 augment_type_symtab ();
8427 cust = sig_type->type_unit_group->compunit_symtab;
8430 if (dwarf2_per_objfile->using_index)
8431 per_cu->v.quick->compunit_symtab = cust;
8434 struct partial_symtab *pst = per_cu->v.psymtab;
8435 pst->compunit_symtab = cust;
8439 do_cleanups (back_to);
8442 /* Process an imported unit DIE. */
8445 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
8447 struct attribute *attr;
8449 /* For now we don't handle imported units in type units. */
8450 if (cu->per_cu->is_debug_types)
8452 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8453 " supported in type units [in module %s]"),
8454 objfile_name (cu->objfile));
8457 attr = dwarf2_attr (die, DW_AT_import, cu);
8460 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
8461 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
8462 dwarf2_per_cu_data *per_cu
8463 = dwarf2_find_containing_comp_unit (sect_off, is_dwz, cu->objfile);
8465 /* If necessary, add it to the queue and load its DIEs. */
8466 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
8467 load_full_comp_unit (per_cu, cu->language);
8469 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8474 /* Reset the in_process bit of a die. */
8477 reset_die_in_process (void *arg)
8479 struct die_info *die = (struct die_info *) arg;
8481 die->in_process = 0;
8484 /* Process a die and its children. */
8487 process_die (struct die_info *die, struct dwarf2_cu *cu)
8489 struct cleanup *in_process;
8491 /* We should only be processing those not already in process. */
8492 gdb_assert (!die->in_process);
8494 die->in_process = 1;
8495 in_process = make_cleanup (reset_die_in_process,die);
8499 case DW_TAG_padding:
8501 case DW_TAG_compile_unit:
8502 case DW_TAG_partial_unit:
8503 read_file_scope (die, cu);
8505 case DW_TAG_type_unit:
8506 read_type_unit_scope (die, cu);
8508 case DW_TAG_subprogram:
8509 case DW_TAG_inlined_subroutine:
8510 read_func_scope (die, cu);
8512 case DW_TAG_lexical_block:
8513 case DW_TAG_try_block:
8514 case DW_TAG_catch_block:
8515 read_lexical_block_scope (die, cu);
8517 case DW_TAG_call_site:
8518 case DW_TAG_GNU_call_site:
8519 read_call_site_scope (die, cu);
8521 case DW_TAG_class_type:
8522 case DW_TAG_interface_type:
8523 case DW_TAG_structure_type:
8524 case DW_TAG_union_type:
8525 process_structure_scope (die, cu);
8527 case DW_TAG_enumeration_type:
8528 process_enumeration_scope (die, cu);
8531 /* These dies have a type, but processing them does not create
8532 a symbol or recurse to process the children. Therefore we can
8533 read them on-demand through read_type_die. */
8534 case DW_TAG_subroutine_type:
8535 case DW_TAG_set_type:
8536 case DW_TAG_array_type:
8537 case DW_TAG_pointer_type:
8538 case DW_TAG_ptr_to_member_type:
8539 case DW_TAG_reference_type:
8540 case DW_TAG_rvalue_reference_type:
8541 case DW_TAG_string_type:
8544 case DW_TAG_base_type:
8545 case DW_TAG_subrange_type:
8546 case DW_TAG_typedef:
8547 /* Add a typedef symbol for the type definition, if it has a
8549 new_symbol (die, read_type_die (die, cu), cu);
8551 case DW_TAG_common_block:
8552 read_common_block (die, cu);
8554 case DW_TAG_common_inclusion:
8556 case DW_TAG_namespace:
8557 cu->processing_has_namespace_info = 1;
8558 read_namespace (die, cu);
8561 cu->processing_has_namespace_info = 1;
8562 read_module (die, cu);
8564 case DW_TAG_imported_declaration:
8565 cu->processing_has_namespace_info = 1;
8566 if (read_namespace_alias (die, cu))
8568 /* The declaration is not a global namespace alias: fall through. */
8569 case DW_TAG_imported_module:
8570 cu->processing_has_namespace_info = 1;
8571 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
8572 || cu->language != language_fortran))
8573 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
8574 dwarf_tag_name (die->tag));
8575 read_import_statement (die, cu);
8578 case DW_TAG_imported_unit:
8579 process_imported_unit_die (die, cu);
8583 new_symbol (die, NULL, cu);
8587 do_cleanups (in_process);
8590 /* DWARF name computation. */
8592 /* A helper function for dwarf2_compute_name which determines whether DIE
8593 needs to have the name of the scope prepended to the name listed in the
8597 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
8599 struct attribute *attr;
8603 case DW_TAG_namespace:
8604 case DW_TAG_typedef:
8605 case DW_TAG_class_type:
8606 case DW_TAG_interface_type:
8607 case DW_TAG_structure_type:
8608 case DW_TAG_union_type:
8609 case DW_TAG_enumeration_type:
8610 case DW_TAG_enumerator:
8611 case DW_TAG_subprogram:
8612 case DW_TAG_inlined_subroutine:
8614 case DW_TAG_imported_declaration:
8617 case DW_TAG_variable:
8618 case DW_TAG_constant:
8619 /* We only need to prefix "globally" visible variables. These include
8620 any variable marked with DW_AT_external or any variable that
8621 lives in a namespace. [Variables in anonymous namespaces
8622 require prefixing, but they are not DW_AT_external.] */
8624 if (dwarf2_attr (die, DW_AT_specification, cu))
8626 struct dwarf2_cu *spec_cu = cu;
8628 return die_needs_namespace (die_specification (die, &spec_cu),
8632 attr = dwarf2_attr (die, DW_AT_external, cu);
8633 if (attr == NULL && die->parent->tag != DW_TAG_namespace
8634 && die->parent->tag != DW_TAG_module)
8636 /* A variable in a lexical block of some kind does not need a
8637 namespace, even though in C++ such variables may be external
8638 and have a mangled name. */
8639 if (die->parent->tag == DW_TAG_lexical_block
8640 || die->parent->tag == DW_TAG_try_block
8641 || die->parent->tag == DW_TAG_catch_block
8642 || die->parent->tag == DW_TAG_subprogram)
8651 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
8652 compute the physname for the object, which include a method's:
8653 - formal parameters (C++),
8654 - receiver type (Go),
8656 The term "physname" is a bit confusing.
8657 For C++, for example, it is the demangled name.
8658 For Go, for example, it's the mangled name.
8660 For Ada, return the DIE's linkage name rather than the fully qualified
8661 name. PHYSNAME is ignored..
8663 The result is allocated on the objfile_obstack and canonicalized. */
8666 dwarf2_compute_name (const char *name,
8667 struct die_info *die, struct dwarf2_cu *cu,
8670 struct objfile *objfile = cu->objfile;
8673 name = dwarf2_name (die, cu);
8675 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
8676 but otherwise compute it by typename_concat inside GDB.
8677 FIXME: Actually this is not really true, or at least not always true.
8678 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
8679 Fortran names because there is no mangling standard. So new_symbol_full
8680 will set the demangled name to the result of dwarf2_full_name, and it is
8681 the demangled name that GDB uses if it exists. */
8682 if (cu->language == language_ada
8683 || (cu->language == language_fortran && physname))
8685 /* For Ada unit, we prefer the linkage name over the name, as
8686 the former contains the exported name, which the user expects
8687 to be able to reference. Ideally, we want the user to be able
8688 to reference this entity using either natural or linkage name,
8689 but we haven't started looking at this enhancement yet. */
8690 const char *linkage_name;
8692 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
8693 if (linkage_name == NULL)
8694 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
8695 if (linkage_name != NULL)
8696 return linkage_name;
8699 /* These are the only languages we know how to qualify names in. */
8701 && (cu->language == language_cplus
8702 || cu->language == language_fortran || cu->language == language_d
8703 || cu->language == language_rust))
8705 if (die_needs_namespace (die, cu))
8709 const char *canonical_name = NULL;
8713 prefix = determine_prefix (die, cu);
8714 if (*prefix != '\0')
8716 char *prefixed_name = typename_concat (NULL, prefix, name,
8719 buf.puts (prefixed_name);
8720 xfree (prefixed_name);
8725 /* Template parameters may be specified in the DIE's DW_AT_name, or
8726 as children with DW_TAG_template_type_param or
8727 DW_TAG_value_type_param. If the latter, add them to the name
8728 here. If the name already has template parameters, then
8729 skip this step; some versions of GCC emit both, and
8730 it is more efficient to use the pre-computed name.
8732 Something to keep in mind about this process: it is very
8733 unlikely, or in some cases downright impossible, to produce
8734 something that will match the mangled name of a function.
8735 If the definition of the function has the same debug info,
8736 we should be able to match up with it anyway. But fallbacks
8737 using the minimal symbol, for instance to find a method
8738 implemented in a stripped copy of libstdc++, will not work.
8739 If we do not have debug info for the definition, we will have to
8740 match them up some other way.
8742 When we do name matching there is a related problem with function
8743 templates; two instantiated function templates are allowed to
8744 differ only by their return types, which we do not add here. */
8746 if (cu->language == language_cplus && strchr (name, '<') == NULL)
8748 struct attribute *attr;
8749 struct die_info *child;
8752 die->building_fullname = 1;
8754 for (child = die->child; child != NULL; child = child->sibling)
8758 const gdb_byte *bytes;
8759 struct dwarf2_locexpr_baton *baton;
8762 if (child->tag != DW_TAG_template_type_param
8763 && child->tag != DW_TAG_template_value_param)
8774 attr = dwarf2_attr (child, DW_AT_type, cu);
8777 complaint (&symfile_complaints,
8778 _("template parameter missing DW_AT_type"));
8779 buf.puts ("UNKNOWN_TYPE");
8782 type = die_type (child, cu);
8784 if (child->tag == DW_TAG_template_type_param)
8786 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
8790 attr = dwarf2_attr (child, DW_AT_const_value, cu);
8793 complaint (&symfile_complaints,
8794 _("template parameter missing "
8795 "DW_AT_const_value"));
8796 buf.puts ("UNKNOWN_VALUE");
8800 dwarf2_const_value_attr (attr, type, name,
8801 &cu->comp_unit_obstack, cu,
8802 &value, &bytes, &baton);
8804 if (TYPE_NOSIGN (type))
8805 /* GDB prints characters as NUMBER 'CHAR'. If that's
8806 changed, this can use value_print instead. */
8807 c_printchar (value, type, &buf);
8810 struct value_print_options opts;
8813 v = dwarf2_evaluate_loc_desc (type, NULL,
8817 else if (bytes != NULL)
8819 v = allocate_value (type);
8820 memcpy (value_contents_writeable (v), bytes,
8821 TYPE_LENGTH (type));
8824 v = value_from_longest (type, value);
8826 /* Specify decimal so that we do not depend on
8828 get_formatted_print_options (&opts, 'd');
8830 value_print (v, &buf, &opts);
8836 die->building_fullname = 0;
8840 /* Close the argument list, with a space if necessary
8841 (nested templates). */
8842 if (!buf.empty () && buf.string ().back () == '>')
8849 /* For C++ methods, append formal parameter type
8850 information, if PHYSNAME. */
8852 if (physname && die->tag == DW_TAG_subprogram
8853 && cu->language == language_cplus)
8855 struct type *type = read_type_die (die, cu);
8857 c_type_print_args (type, &buf, 1, cu->language,
8858 &type_print_raw_options);
8860 if (cu->language == language_cplus)
8862 /* Assume that an artificial first parameter is
8863 "this", but do not crash if it is not. RealView
8864 marks unnamed (and thus unused) parameters as
8865 artificial; there is no way to differentiate
8867 if (TYPE_NFIELDS (type) > 0
8868 && TYPE_FIELD_ARTIFICIAL (type, 0)
8869 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8870 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8872 buf.puts (" const");
8876 const std::string &intermediate_name = buf.string ();
8878 if (cu->language == language_cplus)
8880 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
8881 &objfile->per_bfd->storage_obstack);
8883 /* If we only computed INTERMEDIATE_NAME, or if
8884 INTERMEDIATE_NAME is already canonical, then we need to
8885 copy it to the appropriate obstack. */
8886 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
8887 name = ((const char *)
8888 obstack_copy0 (&objfile->per_bfd->storage_obstack,
8889 intermediate_name.c_str (),
8890 intermediate_name.length ()));
8892 name = canonical_name;
8899 /* Return the fully qualified name of DIE, based on its DW_AT_name.
8900 If scope qualifiers are appropriate they will be added. The result
8901 will be allocated on the storage_obstack, or NULL if the DIE does
8902 not have a name. NAME may either be from a previous call to
8903 dwarf2_name or NULL.
8905 The output string will be canonicalized (if C++). */
8908 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8910 return dwarf2_compute_name (name, die, cu, 0);
8913 /* Construct a physname for the given DIE in CU. NAME may either be
8914 from a previous call to dwarf2_name or NULL. The result will be
8915 allocated on the objfile_objstack or NULL if the DIE does not have a
8918 The output string will be canonicalized (if C++). */
8921 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8923 struct objfile *objfile = cu->objfile;
8924 const char *retval, *mangled = NULL, *canon = NULL;
8925 struct cleanup *back_to;
8928 /* In this case dwarf2_compute_name is just a shortcut not building anything
8930 if (!die_needs_namespace (die, cu))
8931 return dwarf2_compute_name (name, die, cu, 1);
8933 back_to = make_cleanup (null_cleanup, NULL);
8935 mangled = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
8936 if (mangled == NULL)
8937 mangled = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
8939 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
8940 See https://github.com/rust-lang/rust/issues/32925. */
8941 if (cu->language == language_rust && mangled != NULL
8942 && strchr (mangled, '{') != NULL)
8945 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
8947 if (mangled != NULL)
8951 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
8952 type. It is easier for GDB users to search for such functions as
8953 `name(params)' than `long name(params)'. In such case the minimal
8954 symbol names do not match the full symbol names but for template
8955 functions there is never a need to look up their definition from their
8956 declaration so the only disadvantage remains the minimal symbol
8957 variant `long name(params)' does not have the proper inferior type.
8960 if (cu->language == language_go)
8962 /* This is a lie, but we already lie to the caller new_symbol_full.
8963 new_symbol_full assumes we return the mangled name.
8964 This just undoes that lie until things are cleaned up. */
8969 demangled = gdb_demangle (mangled,
8970 (DMGL_PARAMS | DMGL_ANSI | DMGL_RET_DROP));
8974 make_cleanup (xfree, demangled);
8984 if (canon == NULL || check_physname)
8986 const char *physname = dwarf2_compute_name (name, die, cu, 1);
8988 if (canon != NULL && strcmp (physname, canon) != 0)
8990 /* It may not mean a bug in GDB. The compiler could also
8991 compute DW_AT_linkage_name incorrectly. But in such case
8992 GDB would need to be bug-to-bug compatible. */
8994 complaint (&symfile_complaints,
8995 _("Computed physname <%s> does not match demangled <%s> "
8996 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
8997 physname, canon, mangled, to_underlying (die->sect_off),
8998 objfile_name (objfile));
9000 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
9001 is available here - over computed PHYSNAME. It is safer
9002 against both buggy GDB and buggy compilers. */
9016 retval = ((const char *)
9017 obstack_copy0 (&objfile->per_bfd->storage_obstack,
9018 retval, strlen (retval)));
9020 do_cleanups (back_to);
9024 /* Inspect DIE in CU for a namespace alias. If one exists, record
9025 a new symbol for it.
9027 Returns 1 if a namespace alias was recorded, 0 otherwise. */
9030 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
9032 struct attribute *attr;
9034 /* If the die does not have a name, this is not a namespace
9036 attr = dwarf2_attr (die, DW_AT_name, cu);
9040 struct die_info *d = die;
9041 struct dwarf2_cu *imported_cu = cu;
9043 /* If the compiler has nested DW_AT_imported_declaration DIEs,
9044 keep inspecting DIEs until we hit the underlying import. */
9045 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
9046 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
9048 attr = dwarf2_attr (d, DW_AT_import, cu);
9052 d = follow_die_ref (d, attr, &imported_cu);
9053 if (d->tag != DW_TAG_imported_declaration)
9057 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
9059 complaint (&symfile_complaints,
9060 _("DIE at 0x%x has too many recursively imported "
9061 "declarations"), to_underlying (d->sect_off));
9068 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
9070 type = get_die_type_at_offset (sect_off, cu->per_cu);
9071 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
9073 /* This declaration is a global namespace alias. Add
9074 a symbol for it whose type is the aliased namespace. */
9075 new_symbol (die, type, cu);
9084 /* Return the using directives repository (global or local?) to use in the
9085 current context for LANGUAGE.
9087 For Ada, imported declarations can materialize renamings, which *may* be
9088 global. However it is impossible (for now?) in DWARF to distinguish
9089 "external" imported declarations and "static" ones. As all imported
9090 declarations seem to be static in all other languages, make them all CU-wide
9091 global only in Ada. */
9093 static struct using_direct **
9094 using_directives (enum language language)
9096 if (language == language_ada && context_stack_depth == 0)
9097 return &global_using_directives;
9099 return &local_using_directives;
9102 /* Read the import statement specified by the given die and record it. */
9105 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
9107 struct objfile *objfile = cu->objfile;
9108 struct attribute *import_attr;
9109 struct die_info *imported_die, *child_die;
9110 struct dwarf2_cu *imported_cu;
9111 const char *imported_name;
9112 const char *imported_name_prefix;
9113 const char *canonical_name;
9114 const char *import_alias;
9115 const char *imported_declaration = NULL;
9116 const char *import_prefix;
9117 VEC (const_char_ptr) *excludes = NULL;
9118 struct cleanup *cleanups;
9120 import_attr = dwarf2_attr (die, DW_AT_import, cu);
9121 if (import_attr == NULL)
9123 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9124 dwarf_tag_name (die->tag));
9129 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
9130 imported_name = dwarf2_name (imported_die, imported_cu);
9131 if (imported_name == NULL)
9133 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
9135 The import in the following code:
9149 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
9150 <52> DW_AT_decl_file : 1
9151 <53> DW_AT_decl_line : 6
9152 <54> DW_AT_import : <0x75>
9153 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
9155 <5b> DW_AT_decl_file : 1
9156 <5c> DW_AT_decl_line : 2
9157 <5d> DW_AT_type : <0x6e>
9159 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
9160 <76> DW_AT_byte_size : 4
9161 <77> DW_AT_encoding : 5 (signed)
9163 imports the wrong die ( 0x75 instead of 0x58 ).
9164 This case will be ignored until the gcc bug is fixed. */
9168 /* Figure out the local name after import. */
9169 import_alias = dwarf2_name (die, cu);
9171 /* Figure out where the statement is being imported to. */
9172 import_prefix = determine_prefix (die, cu);
9174 /* Figure out what the scope of the imported die is and prepend it
9175 to the name of the imported die. */
9176 imported_name_prefix = determine_prefix (imported_die, imported_cu);
9178 if (imported_die->tag != DW_TAG_namespace
9179 && imported_die->tag != DW_TAG_module)
9181 imported_declaration = imported_name;
9182 canonical_name = imported_name_prefix;
9184 else if (strlen (imported_name_prefix) > 0)
9185 canonical_name = obconcat (&objfile->objfile_obstack,
9186 imported_name_prefix,
9187 (cu->language == language_d ? "." : "::"),
9188 imported_name, (char *) NULL);
9190 canonical_name = imported_name;
9192 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
9194 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
9195 for (child_die = die->child; child_die && child_die->tag;
9196 child_die = sibling_die (child_die))
9198 /* DWARF-4: A Fortran use statement with a “rename list” may be
9199 represented by an imported module entry with an import attribute
9200 referring to the module and owned entries corresponding to those
9201 entities that are renamed as part of being imported. */
9203 if (child_die->tag != DW_TAG_imported_declaration)
9205 complaint (&symfile_complaints,
9206 _("child DW_TAG_imported_declaration expected "
9207 "- DIE at 0x%x [in module %s]"),
9208 to_underlying (child_die->sect_off), objfile_name (objfile));
9212 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
9213 if (import_attr == NULL)
9215 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9216 dwarf_tag_name (child_die->tag));
9221 imported_die = follow_die_ref_or_sig (child_die, import_attr,
9223 imported_name = dwarf2_name (imported_die, imported_cu);
9224 if (imported_name == NULL)
9226 complaint (&symfile_complaints,
9227 _("child DW_TAG_imported_declaration has unknown "
9228 "imported name - DIE at 0x%x [in module %s]"),
9229 to_underlying (child_die->sect_off), objfile_name (objfile));
9233 VEC_safe_push (const_char_ptr, excludes, imported_name);
9235 process_die (child_die, cu);
9238 add_using_directive (using_directives (cu->language),
9242 imported_declaration,
9245 &objfile->objfile_obstack);
9247 do_cleanups (cleanups);
9250 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
9251 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
9252 this, it was first present in GCC release 4.3.0. */
9255 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
9257 if (!cu->checked_producer)
9258 check_producer (cu);
9260 return cu->producer_is_gcc_lt_4_3;
9263 static file_and_directory
9264 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
9266 file_and_directory res;
9268 /* Find the filename. Do not use dwarf2_name here, since the filename
9269 is not a source language identifier. */
9270 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
9271 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
9273 if (res.comp_dir == NULL
9274 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
9275 && IS_ABSOLUTE_PATH (res.name))
9277 res.comp_dir_storage = ldirname (res.name);
9278 if (!res.comp_dir_storage.empty ())
9279 res.comp_dir = res.comp_dir_storage.c_str ();
9281 if (res.comp_dir != NULL)
9283 /* Irix 6.2 native cc prepends <machine>.: to the compilation
9284 directory, get rid of it. */
9285 const char *cp = strchr (res.comp_dir, ':');
9287 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
9288 res.comp_dir = cp + 1;
9291 if (res.name == NULL)
9292 res.name = "<unknown>";
9297 /* Handle DW_AT_stmt_list for a compilation unit.
9298 DIE is the DW_TAG_compile_unit die for CU.
9299 COMP_DIR is the compilation directory. LOWPC is passed to
9300 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
9303 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
9304 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
9306 struct objfile *objfile = dwarf2_per_objfile->objfile;
9307 struct attribute *attr;
9308 struct line_header line_header_local;
9309 hashval_t line_header_local_hash;
9314 gdb_assert (! cu->per_cu->is_debug_types);
9316 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9320 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
9322 /* The line header hash table is only created if needed (it exists to
9323 prevent redundant reading of the line table for partial_units).
9324 If we're given a partial_unit, we'll need it. If we're given a
9325 compile_unit, then use the line header hash table if it's already
9326 created, but don't create one just yet. */
9328 if (dwarf2_per_objfile->line_header_hash == NULL
9329 && die->tag == DW_TAG_partial_unit)
9331 dwarf2_per_objfile->line_header_hash
9332 = htab_create_alloc_ex (127, line_header_hash_voidp,
9333 line_header_eq_voidp,
9334 free_line_header_voidp,
9335 &objfile->objfile_obstack,
9336 hashtab_obstack_allocate,
9337 dummy_obstack_deallocate);
9340 line_header_local.sect_off = line_offset;
9341 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
9342 line_header_local_hash = line_header_hash (&line_header_local);
9343 if (dwarf2_per_objfile->line_header_hash != NULL)
9345 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9347 line_header_local_hash, NO_INSERT);
9349 /* For DW_TAG_compile_unit we need info like symtab::linetable which
9350 is not present in *SLOT (since if there is something in *SLOT then
9351 it will be for a partial_unit). */
9352 if (die->tag == DW_TAG_partial_unit && slot != NULL)
9354 gdb_assert (*slot != NULL);
9355 cu->line_header = (struct line_header *) *slot;
9360 /* dwarf_decode_line_header does not yet provide sufficient information.
9361 We always have to call also dwarf_decode_lines for it. */
9362 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
9365 cu->line_header = lh.get ();
9367 if (dwarf2_per_objfile->line_header_hash == NULL)
9371 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9373 line_header_local_hash, INSERT);
9374 gdb_assert (slot != NULL);
9376 if (slot != NULL && *slot == NULL)
9378 /* This newly decoded line number information unit will be owned
9379 by line_header_hash hash table. */
9380 *slot = cu->line_header;
9384 /* We cannot free any current entry in (*slot) as that struct line_header
9385 may be already used by multiple CUs. Create only temporary decoded
9386 line_header for this CU - it may happen at most once for each line
9387 number information unit. And if we're not using line_header_hash
9388 then this is what we want as well. */
9389 gdb_assert (die->tag != DW_TAG_partial_unit);
9391 decode_mapping = (die->tag != DW_TAG_partial_unit);
9392 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
9398 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
9401 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
9403 struct objfile *objfile = dwarf2_per_objfile->objfile;
9404 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9405 CORE_ADDR lowpc = ((CORE_ADDR) -1);
9406 CORE_ADDR highpc = ((CORE_ADDR) 0);
9407 struct attribute *attr;
9408 struct die_info *child_die;
9411 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9413 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
9415 /* If we didn't find a lowpc, set it to highpc to avoid complaints
9416 from finish_block. */
9417 if (lowpc == ((CORE_ADDR) -1))
9419 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
9421 file_and_directory fnd = find_file_and_directory (die, cu);
9423 prepare_one_comp_unit (cu, die, cu->language);
9425 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
9426 standardised yet. As a workaround for the language detection we fall
9427 back to the DW_AT_producer string. */
9428 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
9429 cu->language = language_opencl;
9431 /* Similar hack for Go. */
9432 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
9433 set_cu_language (DW_LANG_Go, cu);
9435 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
9437 /* Decode line number information if present. We do this before
9438 processing child DIEs, so that the line header table is available
9439 for DW_AT_decl_file. */
9440 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
9442 /* Process all dies in compilation unit. */
9443 if (die->child != NULL)
9445 child_die = die->child;
9446 while (child_die && child_die->tag)
9448 process_die (child_die, cu);
9449 child_die = sibling_die (child_die);
9453 /* Decode macro information, if present. Dwarf 2 macro information
9454 refers to information in the line number info statement program
9455 header, so we can only read it if we've read the header
9457 attr = dwarf2_attr (die, DW_AT_macros, cu);
9459 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
9460 if (attr && cu->line_header)
9462 if (dwarf2_attr (die, DW_AT_macro_info, cu))
9463 complaint (&symfile_complaints,
9464 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
9466 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
9470 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
9471 if (attr && cu->line_header)
9473 unsigned int macro_offset = DW_UNSND (attr);
9475 dwarf_decode_macros (cu, macro_offset, 0);
9480 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
9481 Create the set of symtabs used by this TU, or if this TU is sharing
9482 symtabs with another TU and the symtabs have already been created
9483 then restore those symtabs in the line header.
9484 We don't need the pc/line-number mapping for type units. */
9487 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
9489 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
9490 struct type_unit_group *tu_group;
9492 struct attribute *attr;
9494 struct signatured_type *sig_type;
9496 gdb_assert (per_cu->is_debug_types);
9497 sig_type = (struct signatured_type *) per_cu;
9499 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9501 /* If we're using .gdb_index (includes -readnow) then
9502 per_cu->type_unit_group may not have been set up yet. */
9503 if (sig_type->type_unit_group == NULL)
9504 sig_type->type_unit_group = get_type_unit_group (cu, attr);
9505 tu_group = sig_type->type_unit_group;
9507 /* If we've already processed this stmt_list there's no real need to
9508 do it again, we could fake it and just recreate the part we need
9509 (file name,index -> symtab mapping). If data shows this optimization
9510 is useful we can do it then. */
9511 first_time = tu_group->compunit_symtab == NULL;
9513 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
9518 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
9519 lh = dwarf_decode_line_header (line_offset, cu);
9524 dwarf2_start_symtab (cu, "", NULL, 0);
9527 gdb_assert (tu_group->symtabs == NULL);
9528 restart_symtab (tu_group->compunit_symtab, "", 0);
9533 cu->line_header = lh.get ();
9537 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
9539 /* Note: We don't assign tu_group->compunit_symtab yet because we're
9540 still initializing it, and our caller (a few levels up)
9541 process_full_type_unit still needs to know if this is the first
9544 tu_group->num_symtabs = lh->file_names.size ();
9545 tu_group->symtabs = XNEWVEC (struct symtab *, lh->file_names.size ());
9547 for (i = 0; i < lh->file_names.size (); ++i)
9549 file_entry &fe = lh->file_names[i];
9551 dwarf2_start_subfile (fe.name, fe.include_dir (lh.get ()));
9553 if (current_subfile->symtab == NULL)
9555 /* NOTE: start_subfile will recognize when it's been passed
9556 a file it has already seen. So we can't assume there's a
9557 simple mapping from lh->file_names to subfiles, plus
9558 lh->file_names may contain dups. */
9559 current_subfile->symtab
9560 = allocate_symtab (cust, current_subfile->name);
9563 fe.symtab = current_subfile->symtab;
9564 tu_group->symtabs[i] = fe.symtab;
9569 restart_symtab (tu_group->compunit_symtab, "", 0);
9571 for (i = 0; i < lh->file_names.size (); ++i)
9573 struct file_entry *fe = &lh->file_names[i];
9575 fe->symtab = tu_group->symtabs[i];
9581 /* The main symtab is allocated last. Type units don't have DW_AT_name
9582 so they don't have a "real" (so to speak) symtab anyway.
9583 There is later code that will assign the main symtab to all symbols
9584 that don't have one. We need to handle the case of a symbol with a
9585 missing symtab (DW_AT_decl_file) anyway. */
9588 /* Process DW_TAG_type_unit.
9589 For TUs we want to skip the first top level sibling if it's not the
9590 actual type being defined by this TU. In this case the first top
9591 level sibling is there to provide context only. */
9594 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
9596 struct die_info *child_die;
9598 prepare_one_comp_unit (cu, die, language_minimal);
9600 /* Initialize (or reinitialize) the machinery for building symtabs.
9601 We do this before processing child DIEs, so that the line header table
9602 is available for DW_AT_decl_file. */
9603 setup_type_unit_groups (die, cu);
9605 if (die->child != NULL)
9607 child_die = die->child;
9608 while (child_die && child_die->tag)
9610 process_die (child_die, cu);
9611 child_die = sibling_die (child_die);
9618 http://gcc.gnu.org/wiki/DebugFission
9619 http://gcc.gnu.org/wiki/DebugFissionDWP
9621 To simplify handling of both DWO files ("object" files with the DWARF info)
9622 and DWP files (a file with the DWOs packaged up into one file), we treat
9623 DWP files as having a collection of virtual DWO files. */
9626 hash_dwo_file (const void *item)
9628 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
9631 hash = htab_hash_string (dwo_file->dwo_name);
9632 if (dwo_file->comp_dir != NULL)
9633 hash += htab_hash_string (dwo_file->comp_dir);
9638 eq_dwo_file (const void *item_lhs, const void *item_rhs)
9640 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
9641 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
9643 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
9645 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
9646 return lhs->comp_dir == rhs->comp_dir;
9647 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
9650 /* Allocate a hash table for DWO files. */
9653 allocate_dwo_file_hash_table (void)
9655 struct objfile *objfile = dwarf2_per_objfile->objfile;
9657 return htab_create_alloc_ex (41,
9661 &objfile->objfile_obstack,
9662 hashtab_obstack_allocate,
9663 dummy_obstack_deallocate);
9666 /* Lookup DWO file DWO_NAME. */
9669 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
9671 struct dwo_file find_entry;
9674 if (dwarf2_per_objfile->dwo_files == NULL)
9675 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
9677 memset (&find_entry, 0, sizeof (find_entry));
9678 find_entry.dwo_name = dwo_name;
9679 find_entry.comp_dir = comp_dir;
9680 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
9686 hash_dwo_unit (const void *item)
9688 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
9690 /* This drops the top 32 bits of the id, but is ok for a hash. */
9691 return dwo_unit->signature;
9695 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
9697 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
9698 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
9700 /* The signature is assumed to be unique within the DWO file.
9701 So while object file CU dwo_id's always have the value zero,
9702 that's OK, assuming each object file DWO file has only one CU,
9703 and that's the rule for now. */
9704 return lhs->signature == rhs->signature;
9707 /* Allocate a hash table for DWO CUs,TUs.
9708 There is one of these tables for each of CUs,TUs for each DWO file. */
9711 allocate_dwo_unit_table (struct objfile *objfile)
9713 /* Start out with a pretty small number.
9714 Generally DWO files contain only one CU and maybe some TUs. */
9715 return htab_create_alloc_ex (3,
9719 &objfile->objfile_obstack,
9720 hashtab_obstack_allocate,
9721 dummy_obstack_deallocate);
9724 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
9726 struct create_dwo_cu_data
9728 struct dwo_file *dwo_file;
9729 struct dwo_unit dwo_unit;
9732 /* die_reader_func for create_dwo_cu. */
9735 create_dwo_cu_reader (const struct die_reader_specs *reader,
9736 const gdb_byte *info_ptr,
9737 struct die_info *comp_unit_die,
9741 struct dwarf2_cu *cu = reader->cu;
9742 sect_offset sect_off = cu->per_cu->sect_off;
9743 struct dwarf2_section_info *section = cu->per_cu->section;
9744 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
9745 struct dwo_file *dwo_file = data->dwo_file;
9746 struct dwo_unit *dwo_unit = &data->dwo_unit;
9747 struct attribute *attr;
9749 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
9752 complaint (&symfile_complaints,
9753 _("Dwarf Error: debug entry at offset 0x%x is missing"
9754 " its dwo_id [in module %s]"),
9755 to_underlying (sect_off), dwo_file->dwo_name);
9759 dwo_unit->dwo_file = dwo_file;
9760 dwo_unit->signature = DW_UNSND (attr);
9761 dwo_unit->section = section;
9762 dwo_unit->sect_off = sect_off;
9763 dwo_unit->length = cu->per_cu->length;
9765 if (dwarf_read_debug)
9766 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
9767 to_underlying (sect_off),
9768 hex_string (dwo_unit->signature));
9771 /* Create the dwo_units for the CUs in a DWO_FILE.
9772 Note: This function processes DWO files only, not DWP files. */
9775 create_cus_hash_table (struct dwo_file &dwo_file, dwarf2_section_info §ion,
9778 struct objfile *objfile = dwarf2_per_objfile->objfile;
9779 const struct dwarf2_section_info *abbrev_section = &dwo_file.sections.abbrev;
9780 const gdb_byte *info_ptr, *end_ptr;
9782 dwarf2_read_section (objfile, §ion);
9783 info_ptr = section.buffer;
9785 if (info_ptr == NULL)
9788 if (dwarf_read_debug)
9790 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
9791 get_section_name (§ion),
9792 get_section_file_name (§ion));
9795 end_ptr = info_ptr + section.size;
9796 while (info_ptr < end_ptr)
9798 struct dwarf2_per_cu_data per_cu;
9799 struct create_dwo_cu_data create_dwo_cu_data;
9800 struct dwo_unit *dwo_unit;
9802 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
9804 memset (&create_dwo_cu_data.dwo_unit, 0,
9805 sizeof (create_dwo_cu_data.dwo_unit));
9806 memset (&per_cu, 0, sizeof (per_cu));
9807 per_cu.objfile = objfile;
9808 per_cu.is_debug_types = 0;
9809 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
9810 per_cu.section = §ion;
9811 create_dwo_cu_data.dwo_file = &dwo_file;
9813 init_cutu_and_read_dies_no_follow (
9814 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
9815 info_ptr += per_cu.length;
9817 // If the unit could not be parsed, skip it.
9818 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
9821 if (cus_htab == NULL)
9822 cus_htab = allocate_dwo_unit_table (objfile);
9824 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9825 *dwo_unit = create_dwo_cu_data.dwo_unit;
9826 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
9827 gdb_assert (slot != NULL);
9830 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
9831 sect_offset dup_sect_off = dup_cu->sect_off;
9833 complaint (&symfile_complaints,
9834 _("debug cu entry at offset 0x%x is duplicate to"
9835 " the entry at offset 0x%x, signature %s"),
9836 to_underlying (sect_off), to_underlying (dup_sect_off),
9837 hex_string (dwo_unit->signature));
9839 *slot = (void *)dwo_unit;
9843 /* DWP file .debug_{cu,tu}_index section format:
9844 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
9848 Both index sections have the same format, and serve to map a 64-bit
9849 signature to a set of section numbers. Each section begins with a header,
9850 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
9851 indexes, and a pool of 32-bit section numbers. The index sections will be
9852 aligned at 8-byte boundaries in the file.
9854 The index section header consists of:
9856 V, 32 bit version number
9858 N, 32 bit number of compilation units or type units in the index
9859 M, 32 bit number of slots in the hash table
9861 Numbers are recorded using the byte order of the application binary.
9863 The hash table begins at offset 16 in the section, and consists of an array
9864 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
9865 order of the application binary). Unused slots in the hash table are 0.
9866 (We rely on the extreme unlikeliness of a signature being exactly 0.)
9868 The parallel table begins immediately after the hash table
9869 (at offset 16 + 8 * M from the beginning of the section), and consists of an
9870 array of 32-bit indexes (using the byte order of the application binary),
9871 corresponding 1-1 with slots in the hash table. Each entry in the parallel
9872 table contains a 32-bit index into the pool of section numbers. For unused
9873 hash table slots, the corresponding entry in the parallel table will be 0.
9875 The pool of section numbers begins immediately following the hash table
9876 (at offset 16 + 12 * M from the beginning of the section). The pool of
9877 section numbers consists of an array of 32-bit words (using the byte order
9878 of the application binary). Each item in the array is indexed starting
9879 from 0. The hash table entry provides the index of the first section
9880 number in the set. Additional section numbers in the set follow, and the
9881 set is terminated by a 0 entry (section number 0 is not used in ELF).
9883 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
9884 section must be the first entry in the set, and the .debug_abbrev.dwo must
9885 be the second entry. Other members of the set may follow in any order.
9891 DWP Version 2 combines all the .debug_info, etc. sections into one,
9892 and the entries in the index tables are now offsets into these sections.
9893 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
9896 Index Section Contents:
9898 Hash Table of Signatures dwp_hash_table.hash_table
9899 Parallel Table of Indices dwp_hash_table.unit_table
9900 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
9901 Table of Section Sizes dwp_hash_table.v2.sizes
9903 The index section header consists of:
9905 V, 32 bit version number
9906 L, 32 bit number of columns in the table of section offsets
9907 N, 32 bit number of compilation units or type units in the index
9908 M, 32 bit number of slots in the hash table
9910 Numbers are recorded using the byte order of the application binary.
9912 The hash table has the same format as version 1.
9913 The parallel table of indices has the same format as version 1,
9914 except that the entries are origin-1 indices into the table of sections
9915 offsets and the table of section sizes.
9917 The table of offsets begins immediately following the parallel table
9918 (at offset 16 + 12 * M from the beginning of the section). The table is
9919 a two-dimensional array of 32-bit words (using the byte order of the
9920 application binary), with L columns and N+1 rows, in row-major order.
9921 Each row in the array is indexed starting from 0. The first row provides
9922 a key to the remaining rows: each column in this row provides an identifier
9923 for a debug section, and the offsets in the same column of subsequent rows
9924 refer to that section. The section identifiers are:
9926 DW_SECT_INFO 1 .debug_info.dwo
9927 DW_SECT_TYPES 2 .debug_types.dwo
9928 DW_SECT_ABBREV 3 .debug_abbrev.dwo
9929 DW_SECT_LINE 4 .debug_line.dwo
9930 DW_SECT_LOC 5 .debug_loc.dwo
9931 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
9932 DW_SECT_MACINFO 7 .debug_macinfo.dwo
9933 DW_SECT_MACRO 8 .debug_macro.dwo
9935 The offsets provided by the CU and TU index sections are the base offsets
9936 for the contributions made by each CU or TU to the corresponding section
9937 in the package file. Each CU and TU header contains an abbrev_offset
9938 field, used to find the abbreviations table for that CU or TU within the
9939 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
9940 be interpreted as relative to the base offset given in the index section.
9941 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
9942 should be interpreted as relative to the base offset for .debug_line.dwo,
9943 and offsets into other debug sections obtained from DWARF attributes should
9944 also be interpreted as relative to the corresponding base offset.
9946 The table of sizes begins immediately following the table of offsets.
9947 Like the table of offsets, it is a two-dimensional array of 32-bit words,
9948 with L columns and N rows, in row-major order. Each row in the array is
9949 indexed starting from 1 (row 0 is shared by the two tables).
9953 Hash table lookup is handled the same in version 1 and 2:
9955 We assume that N and M will not exceed 2^32 - 1.
9956 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
9958 Given a 64-bit compilation unit signature or a type signature S, an entry
9959 in the hash table is located as follows:
9961 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
9962 the low-order k bits all set to 1.
9964 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
9966 3) If the hash table entry at index H matches the signature, use that
9967 entry. If the hash table entry at index H is unused (all zeroes),
9968 terminate the search: the signature is not present in the table.
9970 4) Let H = (H + H') modulo M. Repeat at Step 3.
9972 Because M > N and H' and M are relatively prime, the search is guaranteed
9973 to stop at an unused slot or find the match. */
9975 /* Create a hash table to map DWO IDs to their CU/TU entry in
9976 .debug_{info,types}.dwo in DWP_FILE.
9977 Returns NULL if there isn't one.
9978 Note: This function processes DWP files only, not DWO files. */
9980 static struct dwp_hash_table *
9981 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
9983 struct objfile *objfile = dwarf2_per_objfile->objfile;
9984 bfd *dbfd = dwp_file->dbfd;
9985 const gdb_byte *index_ptr, *index_end;
9986 struct dwarf2_section_info *index;
9987 uint32_t version, nr_columns, nr_units, nr_slots;
9988 struct dwp_hash_table *htab;
9991 index = &dwp_file->sections.tu_index;
9993 index = &dwp_file->sections.cu_index;
9995 if (dwarf2_section_empty_p (index))
9997 dwarf2_read_section (objfile, index);
9999 index_ptr = index->buffer;
10000 index_end = index_ptr + index->size;
10002 version = read_4_bytes (dbfd, index_ptr);
10005 nr_columns = read_4_bytes (dbfd, index_ptr);
10009 nr_units = read_4_bytes (dbfd, index_ptr);
10011 nr_slots = read_4_bytes (dbfd, index_ptr);
10014 if (version != 1 && version != 2)
10016 error (_("Dwarf Error: unsupported DWP file version (%s)"
10017 " [in module %s]"),
10018 pulongest (version), dwp_file->name);
10020 if (nr_slots != (nr_slots & -nr_slots))
10022 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
10023 " is not power of 2 [in module %s]"),
10024 pulongest (nr_slots), dwp_file->name);
10027 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
10028 htab->version = version;
10029 htab->nr_columns = nr_columns;
10030 htab->nr_units = nr_units;
10031 htab->nr_slots = nr_slots;
10032 htab->hash_table = index_ptr;
10033 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
10035 /* Exit early if the table is empty. */
10036 if (nr_slots == 0 || nr_units == 0
10037 || (version == 2 && nr_columns == 0))
10039 /* All must be zero. */
10040 if (nr_slots != 0 || nr_units != 0
10041 || (version == 2 && nr_columns != 0))
10043 complaint (&symfile_complaints,
10044 _("Empty DWP but nr_slots,nr_units,nr_columns not"
10045 " all zero [in modules %s]"),
10053 htab->section_pool.v1.indices =
10054 htab->unit_table + sizeof (uint32_t) * nr_slots;
10055 /* It's harder to decide whether the section is too small in v1.
10056 V1 is deprecated anyway so we punt. */
10060 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
10061 int *ids = htab->section_pool.v2.section_ids;
10062 /* Reverse map for error checking. */
10063 int ids_seen[DW_SECT_MAX + 1];
10066 if (nr_columns < 2)
10068 error (_("Dwarf Error: bad DWP hash table, too few columns"
10069 " in section table [in module %s]"),
10072 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
10074 error (_("Dwarf Error: bad DWP hash table, too many columns"
10075 " in section table [in module %s]"),
10078 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10079 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10080 for (i = 0; i < nr_columns; ++i)
10082 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
10084 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
10086 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
10087 " in section table [in module %s]"),
10088 id, dwp_file->name);
10090 if (ids_seen[id] != -1)
10092 error (_("Dwarf Error: bad DWP hash table, duplicate section"
10093 " id %d in section table [in module %s]"),
10094 id, dwp_file->name);
10099 /* Must have exactly one info or types section. */
10100 if (((ids_seen[DW_SECT_INFO] != -1)
10101 + (ids_seen[DW_SECT_TYPES] != -1))
10104 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
10105 " DWO info/types section [in module %s]"),
10108 /* Must have an abbrev section. */
10109 if (ids_seen[DW_SECT_ABBREV] == -1)
10111 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
10112 " section [in module %s]"),
10115 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
10116 htab->section_pool.v2.sizes =
10117 htab->section_pool.v2.offsets + (sizeof (uint32_t)
10118 * nr_units * nr_columns);
10119 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
10120 * nr_units * nr_columns))
10123 error (_("Dwarf Error: DWP index section is corrupt (too small)"
10124 " [in module %s]"),
10132 /* Update SECTIONS with the data from SECTP.
10134 This function is like the other "locate" section routines that are
10135 passed to bfd_map_over_sections, but in this context the sections to
10136 read comes from the DWP V1 hash table, not the full ELF section table.
10138 The result is non-zero for success, or zero if an error was found. */
10141 locate_v1_virtual_dwo_sections (asection *sectp,
10142 struct virtual_v1_dwo_sections *sections)
10144 const struct dwop_section_names *names = &dwop_section_names;
10146 if (section_is_p (sectp->name, &names->abbrev_dwo))
10148 /* There can be only one. */
10149 if (sections->abbrev.s.section != NULL)
10151 sections->abbrev.s.section = sectp;
10152 sections->abbrev.size = bfd_get_section_size (sectp);
10154 else if (section_is_p (sectp->name, &names->info_dwo)
10155 || section_is_p (sectp->name, &names->types_dwo))
10157 /* There can be only one. */
10158 if (sections->info_or_types.s.section != NULL)
10160 sections->info_or_types.s.section = sectp;
10161 sections->info_or_types.size = bfd_get_section_size (sectp);
10163 else if (section_is_p (sectp->name, &names->line_dwo))
10165 /* There can be only one. */
10166 if (sections->line.s.section != NULL)
10168 sections->line.s.section = sectp;
10169 sections->line.size = bfd_get_section_size (sectp);
10171 else if (section_is_p (sectp->name, &names->loc_dwo))
10173 /* There can be only one. */
10174 if (sections->loc.s.section != NULL)
10176 sections->loc.s.section = sectp;
10177 sections->loc.size = bfd_get_section_size (sectp);
10179 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10181 /* There can be only one. */
10182 if (sections->macinfo.s.section != NULL)
10184 sections->macinfo.s.section = sectp;
10185 sections->macinfo.size = bfd_get_section_size (sectp);
10187 else if (section_is_p (sectp->name, &names->macro_dwo))
10189 /* There can be only one. */
10190 if (sections->macro.s.section != NULL)
10192 sections->macro.s.section = sectp;
10193 sections->macro.size = bfd_get_section_size (sectp);
10195 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10197 /* There can be only one. */
10198 if (sections->str_offsets.s.section != NULL)
10200 sections->str_offsets.s.section = sectp;
10201 sections->str_offsets.size = bfd_get_section_size (sectp);
10205 /* No other kind of section is valid. */
10212 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10213 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10214 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10215 This is for DWP version 1 files. */
10217 static struct dwo_unit *
10218 create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file,
10219 uint32_t unit_index,
10220 const char *comp_dir,
10221 ULONGEST signature, int is_debug_types)
10223 struct objfile *objfile = dwarf2_per_objfile->objfile;
10224 const struct dwp_hash_table *dwp_htab =
10225 is_debug_types ? dwp_file->tus : dwp_file->cus;
10226 bfd *dbfd = dwp_file->dbfd;
10227 const char *kind = is_debug_types ? "TU" : "CU";
10228 struct dwo_file *dwo_file;
10229 struct dwo_unit *dwo_unit;
10230 struct virtual_v1_dwo_sections sections;
10231 void **dwo_file_slot;
10232 char *virtual_dwo_name;
10233 struct cleanup *cleanups;
10236 gdb_assert (dwp_file->version == 1);
10238 if (dwarf_read_debug)
10240 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
10242 pulongest (unit_index), hex_string (signature),
10246 /* Fetch the sections of this DWO unit.
10247 Put a limit on the number of sections we look for so that bad data
10248 doesn't cause us to loop forever. */
10250 #define MAX_NR_V1_DWO_SECTIONS \
10251 (1 /* .debug_info or .debug_types */ \
10252 + 1 /* .debug_abbrev */ \
10253 + 1 /* .debug_line */ \
10254 + 1 /* .debug_loc */ \
10255 + 1 /* .debug_str_offsets */ \
10256 + 1 /* .debug_macro or .debug_macinfo */ \
10257 + 1 /* trailing zero */)
10259 memset (§ions, 0, sizeof (sections));
10260 cleanups = make_cleanup (null_cleanup, 0);
10262 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
10265 uint32_t section_nr =
10266 read_4_bytes (dbfd,
10267 dwp_htab->section_pool.v1.indices
10268 + (unit_index + i) * sizeof (uint32_t));
10270 if (section_nr == 0)
10272 if (section_nr >= dwp_file->num_sections)
10274 error (_("Dwarf Error: bad DWP hash table, section number too large"
10275 " [in module %s]"),
10279 sectp = dwp_file->elf_sections[section_nr];
10280 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
10282 error (_("Dwarf Error: bad DWP hash table, invalid section found"
10283 " [in module %s]"),
10289 || dwarf2_section_empty_p (§ions.info_or_types)
10290 || dwarf2_section_empty_p (§ions.abbrev))
10292 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
10293 " [in module %s]"),
10296 if (i == MAX_NR_V1_DWO_SECTIONS)
10298 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
10299 " [in module %s]"),
10303 /* It's easier for the rest of the code if we fake a struct dwo_file and
10304 have dwo_unit "live" in that. At least for now.
10306 The DWP file can be made up of a random collection of CUs and TUs.
10307 However, for each CU + set of TUs that came from the same original DWO
10308 file, we can combine them back into a virtual DWO file to save space
10309 (fewer struct dwo_file objects to allocate). Remember that for really
10310 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10313 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
10314 get_section_id (§ions.abbrev),
10315 get_section_id (§ions.line),
10316 get_section_id (§ions.loc),
10317 get_section_id (§ions.str_offsets));
10318 make_cleanup (xfree, virtual_dwo_name);
10319 /* Can we use an existing virtual DWO file? */
10320 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10321 /* Create one if necessary. */
10322 if (*dwo_file_slot == NULL)
10324 if (dwarf_read_debug)
10326 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10329 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10331 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10333 strlen (virtual_dwo_name));
10334 dwo_file->comp_dir = comp_dir;
10335 dwo_file->sections.abbrev = sections.abbrev;
10336 dwo_file->sections.line = sections.line;
10337 dwo_file->sections.loc = sections.loc;
10338 dwo_file->sections.macinfo = sections.macinfo;
10339 dwo_file->sections.macro = sections.macro;
10340 dwo_file->sections.str_offsets = sections.str_offsets;
10341 /* The "str" section is global to the entire DWP file. */
10342 dwo_file->sections.str = dwp_file->sections.str;
10343 /* The info or types section is assigned below to dwo_unit,
10344 there's no need to record it in dwo_file.
10345 Also, we can't simply record type sections in dwo_file because
10346 we record a pointer into the vector in dwo_unit. As we collect more
10347 types we'll grow the vector and eventually have to reallocate space
10348 for it, invalidating all copies of pointers into the previous
10350 *dwo_file_slot = dwo_file;
10354 if (dwarf_read_debug)
10356 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10359 dwo_file = (struct dwo_file *) *dwo_file_slot;
10361 do_cleanups (cleanups);
10363 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10364 dwo_unit->dwo_file = dwo_file;
10365 dwo_unit->signature = signature;
10366 dwo_unit->section =
10367 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10368 *dwo_unit->section = sections.info_or_types;
10369 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10374 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
10375 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
10376 piece within that section used by a TU/CU, return a virtual section
10377 of just that piece. */
10379 static struct dwarf2_section_info
10380 create_dwp_v2_section (struct dwarf2_section_info *section,
10381 bfd_size_type offset, bfd_size_type size)
10383 struct dwarf2_section_info result;
10386 gdb_assert (section != NULL);
10387 gdb_assert (!section->is_virtual);
10389 memset (&result, 0, sizeof (result));
10390 result.s.containing_section = section;
10391 result.is_virtual = 1;
10396 sectp = get_section_bfd_section (section);
10398 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
10399 bounds of the real section. This is a pretty-rare event, so just
10400 flag an error (easier) instead of a warning and trying to cope. */
10402 || offset + size > bfd_get_section_size (sectp))
10404 bfd *abfd = sectp->owner;
10406 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
10407 " in section %s [in module %s]"),
10408 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
10409 objfile_name (dwarf2_per_objfile->objfile));
10412 result.virtual_offset = offset;
10413 result.size = size;
10417 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10418 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10419 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10420 This is for DWP version 2 files. */
10422 static struct dwo_unit *
10423 create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file,
10424 uint32_t unit_index,
10425 const char *comp_dir,
10426 ULONGEST signature, int is_debug_types)
10428 struct objfile *objfile = dwarf2_per_objfile->objfile;
10429 const struct dwp_hash_table *dwp_htab =
10430 is_debug_types ? dwp_file->tus : dwp_file->cus;
10431 bfd *dbfd = dwp_file->dbfd;
10432 const char *kind = is_debug_types ? "TU" : "CU";
10433 struct dwo_file *dwo_file;
10434 struct dwo_unit *dwo_unit;
10435 struct virtual_v2_dwo_sections sections;
10436 void **dwo_file_slot;
10437 char *virtual_dwo_name;
10438 struct cleanup *cleanups;
10441 gdb_assert (dwp_file->version == 2);
10443 if (dwarf_read_debug)
10445 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
10447 pulongest (unit_index), hex_string (signature),
10451 /* Fetch the section offsets of this DWO unit. */
10453 memset (§ions, 0, sizeof (sections));
10454 cleanups = make_cleanup (null_cleanup, 0);
10456 for (i = 0; i < dwp_htab->nr_columns; ++i)
10458 uint32_t offset = read_4_bytes (dbfd,
10459 dwp_htab->section_pool.v2.offsets
10460 + (((unit_index - 1) * dwp_htab->nr_columns
10462 * sizeof (uint32_t)));
10463 uint32_t size = read_4_bytes (dbfd,
10464 dwp_htab->section_pool.v2.sizes
10465 + (((unit_index - 1) * dwp_htab->nr_columns
10467 * sizeof (uint32_t)));
10469 switch (dwp_htab->section_pool.v2.section_ids[i])
10472 case DW_SECT_TYPES:
10473 sections.info_or_types_offset = offset;
10474 sections.info_or_types_size = size;
10476 case DW_SECT_ABBREV:
10477 sections.abbrev_offset = offset;
10478 sections.abbrev_size = size;
10481 sections.line_offset = offset;
10482 sections.line_size = size;
10485 sections.loc_offset = offset;
10486 sections.loc_size = size;
10488 case DW_SECT_STR_OFFSETS:
10489 sections.str_offsets_offset = offset;
10490 sections.str_offsets_size = size;
10492 case DW_SECT_MACINFO:
10493 sections.macinfo_offset = offset;
10494 sections.macinfo_size = size;
10496 case DW_SECT_MACRO:
10497 sections.macro_offset = offset;
10498 sections.macro_size = size;
10503 /* It's easier for the rest of the code if we fake a struct dwo_file and
10504 have dwo_unit "live" in that. At least for now.
10506 The DWP file can be made up of a random collection of CUs and TUs.
10507 However, for each CU + set of TUs that came from the same original DWO
10508 file, we can combine them back into a virtual DWO file to save space
10509 (fewer struct dwo_file objects to allocate). Remember that for really
10510 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10513 xstrprintf ("virtual-dwo/%ld-%ld-%ld-%ld",
10514 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
10515 (long) (sections.line_size ? sections.line_offset : 0),
10516 (long) (sections.loc_size ? sections.loc_offset : 0),
10517 (long) (sections.str_offsets_size
10518 ? sections.str_offsets_offset : 0));
10519 make_cleanup (xfree, virtual_dwo_name);
10520 /* Can we use an existing virtual DWO file? */
10521 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10522 /* Create one if necessary. */
10523 if (*dwo_file_slot == NULL)
10525 if (dwarf_read_debug)
10527 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10530 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10532 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10534 strlen (virtual_dwo_name));
10535 dwo_file->comp_dir = comp_dir;
10536 dwo_file->sections.abbrev =
10537 create_dwp_v2_section (&dwp_file->sections.abbrev,
10538 sections.abbrev_offset, sections.abbrev_size);
10539 dwo_file->sections.line =
10540 create_dwp_v2_section (&dwp_file->sections.line,
10541 sections.line_offset, sections.line_size);
10542 dwo_file->sections.loc =
10543 create_dwp_v2_section (&dwp_file->sections.loc,
10544 sections.loc_offset, sections.loc_size);
10545 dwo_file->sections.macinfo =
10546 create_dwp_v2_section (&dwp_file->sections.macinfo,
10547 sections.macinfo_offset, sections.macinfo_size);
10548 dwo_file->sections.macro =
10549 create_dwp_v2_section (&dwp_file->sections.macro,
10550 sections.macro_offset, sections.macro_size);
10551 dwo_file->sections.str_offsets =
10552 create_dwp_v2_section (&dwp_file->sections.str_offsets,
10553 sections.str_offsets_offset,
10554 sections.str_offsets_size);
10555 /* The "str" section is global to the entire DWP file. */
10556 dwo_file->sections.str = dwp_file->sections.str;
10557 /* The info or types section is assigned below to dwo_unit,
10558 there's no need to record it in dwo_file.
10559 Also, we can't simply record type sections in dwo_file because
10560 we record a pointer into the vector in dwo_unit. As we collect more
10561 types we'll grow the vector and eventually have to reallocate space
10562 for it, invalidating all copies of pointers into the previous
10564 *dwo_file_slot = dwo_file;
10568 if (dwarf_read_debug)
10570 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10573 dwo_file = (struct dwo_file *) *dwo_file_slot;
10575 do_cleanups (cleanups);
10577 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10578 dwo_unit->dwo_file = dwo_file;
10579 dwo_unit->signature = signature;
10580 dwo_unit->section =
10581 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10582 *dwo_unit->section = create_dwp_v2_section (is_debug_types
10583 ? &dwp_file->sections.types
10584 : &dwp_file->sections.info,
10585 sections.info_or_types_offset,
10586 sections.info_or_types_size);
10587 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10592 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
10593 Returns NULL if the signature isn't found. */
10595 static struct dwo_unit *
10596 lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir,
10597 ULONGEST signature, int is_debug_types)
10599 const struct dwp_hash_table *dwp_htab =
10600 is_debug_types ? dwp_file->tus : dwp_file->cus;
10601 bfd *dbfd = dwp_file->dbfd;
10602 uint32_t mask = dwp_htab->nr_slots - 1;
10603 uint32_t hash = signature & mask;
10604 uint32_t hash2 = ((signature >> 32) & mask) | 1;
10607 struct dwo_unit find_dwo_cu;
10609 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
10610 find_dwo_cu.signature = signature;
10611 slot = htab_find_slot (is_debug_types
10612 ? dwp_file->loaded_tus
10613 : dwp_file->loaded_cus,
10614 &find_dwo_cu, INSERT);
10617 return (struct dwo_unit *) *slot;
10619 /* Use a for loop so that we don't loop forever on bad debug info. */
10620 for (i = 0; i < dwp_htab->nr_slots; ++i)
10622 ULONGEST signature_in_table;
10624 signature_in_table =
10625 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
10626 if (signature_in_table == signature)
10628 uint32_t unit_index =
10629 read_4_bytes (dbfd,
10630 dwp_htab->unit_table + hash * sizeof (uint32_t));
10632 if (dwp_file->version == 1)
10634 *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index,
10635 comp_dir, signature,
10640 *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index,
10641 comp_dir, signature,
10644 return (struct dwo_unit *) *slot;
10646 if (signature_in_table == 0)
10648 hash = (hash + hash2) & mask;
10651 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
10652 " [in module %s]"),
10656 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
10657 Open the file specified by FILE_NAME and hand it off to BFD for
10658 preliminary analysis. Return a newly initialized bfd *, which
10659 includes a canonicalized copy of FILE_NAME.
10660 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
10661 SEARCH_CWD is true if the current directory is to be searched.
10662 It will be searched before debug-file-directory.
10663 If successful, the file is added to the bfd include table of the
10664 objfile's bfd (see gdb_bfd_record_inclusion).
10665 If unable to find/open the file, return NULL.
10666 NOTE: This function is derived from symfile_bfd_open. */
10668 static gdb_bfd_ref_ptr
10669 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
10672 char *absolute_name;
10673 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
10674 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
10675 to debug_file_directory. */
10677 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
10681 if (*debug_file_directory != '\0')
10682 search_path = concat (".", dirname_separator_string,
10683 debug_file_directory, (char *) NULL);
10685 search_path = xstrdup (".");
10688 search_path = xstrdup (debug_file_directory);
10690 flags = OPF_RETURN_REALPATH;
10692 flags |= OPF_SEARCH_IN_PATH;
10693 desc = openp (search_path, flags, file_name,
10694 O_RDONLY | O_BINARY, &absolute_name);
10695 xfree (search_path);
10699 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name, gnutarget, desc));
10700 xfree (absolute_name);
10701 if (sym_bfd == NULL)
10703 bfd_set_cacheable (sym_bfd.get (), 1);
10705 if (!bfd_check_format (sym_bfd.get (), bfd_object))
10708 /* Success. Record the bfd as having been included by the objfile's bfd.
10709 This is important because things like demangled_names_hash lives in the
10710 objfile's per_bfd space and may have references to things like symbol
10711 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
10712 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
10717 /* Try to open DWO file FILE_NAME.
10718 COMP_DIR is the DW_AT_comp_dir attribute.
10719 The result is the bfd handle of the file.
10720 If there is a problem finding or opening the file, return NULL.
10721 Upon success, the canonicalized path of the file is stored in the bfd,
10722 same as symfile_bfd_open. */
10724 static gdb_bfd_ref_ptr
10725 open_dwo_file (const char *file_name, const char *comp_dir)
10727 if (IS_ABSOLUTE_PATH (file_name))
10728 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
10730 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
10732 if (comp_dir != NULL)
10734 char *path_to_try = concat (comp_dir, SLASH_STRING,
10735 file_name, (char *) NULL);
10737 /* NOTE: If comp_dir is a relative path, this will also try the
10738 search path, which seems useful. */
10739 gdb_bfd_ref_ptr abfd (try_open_dwop_file (path_to_try, 0 /*is_dwp*/,
10740 1 /*search_cwd*/));
10741 xfree (path_to_try);
10746 /* That didn't work, try debug-file-directory, which, despite its name,
10747 is a list of paths. */
10749 if (*debug_file_directory == '\0')
10752 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
10755 /* This function is mapped across the sections and remembers the offset and
10756 size of each of the DWO debugging sections we are interested in. */
10759 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
10761 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
10762 const struct dwop_section_names *names = &dwop_section_names;
10764 if (section_is_p (sectp->name, &names->abbrev_dwo))
10766 dwo_sections->abbrev.s.section = sectp;
10767 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
10769 else if (section_is_p (sectp->name, &names->info_dwo))
10771 dwo_sections->info.s.section = sectp;
10772 dwo_sections->info.size = bfd_get_section_size (sectp);
10774 else if (section_is_p (sectp->name, &names->line_dwo))
10776 dwo_sections->line.s.section = sectp;
10777 dwo_sections->line.size = bfd_get_section_size (sectp);
10779 else if (section_is_p (sectp->name, &names->loc_dwo))
10781 dwo_sections->loc.s.section = sectp;
10782 dwo_sections->loc.size = bfd_get_section_size (sectp);
10784 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10786 dwo_sections->macinfo.s.section = sectp;
10787 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
10789 else if (section_is_p (sectp->name, &names->macro_dwo))
10791 dwo_sections->macro.s.section = sectp;
10792 dwo_sections->macro.size = bfd_get_section_size (sectp);
10794 else if (section_is_p (sectp->name, &names->str_dwo))
10796 dwo_sections->str.s.section = sectp;
10797 dwo_sections->str.size = bfd_get_section_size (sectp);
10799 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10801 dwo_sections->str_offsets.s.section = sectp;
10802 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
10804 else if (section_is_p (sectp->name, &names->types_dwo))
10806 struct dwarf2_section_info type_section;
10808 memset (&type_section, 0, sizeof (type_section));
10809 type_section.s.section = sectp;
10810 type_section.size = bfd_get_section_size (sectp);
10811 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
10816 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
10817 by PER_CU. This is for the non-DWP case.
10818 The result is NULL if DWO_NAME can't be found. */
10820 static struct dwo_file *
10821 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
10822 const char *dwo_name, const char *comp_dir)
10824 struct objfile *objfile = dwarf2_per_objfile->objfile;
10825 struct dwo_file *dwo_file;
10826 struct cleanup *cleanups;
10828 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwo_name, comp_dir));
10831 if (dwarf_read_debug)
10832 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
10835 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10836 dwo_file->dwo_name = dwo_name;
10837 dwo_file->comp_dir = comp_dir;
10838 dwo_file->dbfd = dbfd.release ();
10840 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
10842 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
10843 &dwo_file->sections);
10845 create_cus_hash_table (*dwo_file, dwo_file->sections.info, dwo_file->cus);
10847 create_debug_types_hash_table (dwo_file, dwo_file->sections.types,
10850 discard_cleanups (cleanups);
10852 if (dwarf_read_debug)
10853 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
10858 /* This function is mapped across the sections and remembers the offset and
10859 size of each of the DWP debugging sections common to version 1 and 2 that
10860 we are interested in. */
10863 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
10864 void *dwp_file_ptr)
10866 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
10867 const struct dwop_section_names *names = &dwop_section_names;
10868 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10870 /* Record the ELF section number for later lookup: this is what the
10871 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10872 gdb_assert (elf_section_nr < dwp_file->num_sections);
10873 dwp_file->elf_sections[elf_section_nr] = sectp;
10875 /* Look for specific sections that we need. */
10876 if (section_is_p (sectp->name, &names->str_dwo))
10878 dwp_file->sections.str.s.section = sectp;
10879 dwp_file->sections.str.size = bfd_get_section_size (sectp);
10881 else if (section_is_p (sectp->name, &names->cu_index))
10883 dwp_file->sections.cu_index.s.section = sectp;
10884 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
10886 else if (section_is_p (sectp->name, &names->tu_index))
10888 dwp_file->sections.tu_index.s.section = sectp;
10889 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
10893 /* This function is mapped across the sections and remembers the offset and
10894 size of each of the DWP version 2 debugging sections that we are interested
10895 in. This is split into a separate function because we don't know if we
10896 have version 1 or 2 until we parse the cu_index/tu_index sections. */
10899 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
10901 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
10902 const struct dwop_section_names *names = &dwop_section_names;
10903 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10905 /* Record the ELF section number for later lookup: this is what the
10906 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10907 gdb_assert (elf_section_nr < dwp_file->num_sections);
10908 dwp_file->elf_sections[elf_section_nr] = sectp;
10910 /* Look for specific sections that we need. */
10911 if (section_is_p (sectp->name, &names->abbrev_dwo))
10913 dwp_file->sections.abbrev.s.section = sectp;
10914 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
10916 else if (section_is_p (sectp->name, &names->info_dwo))
10918 dwp_file->sections.info.s.section = sectp;
10919 dwp_file->sections.info.size = bfd_get_section_size (sectp);
10921 else if (section_is_p (sectp->name, &names->line_dwo))
10923 dwp_file->sections.line.s.section = sectp;
10924 dwp_file->sections.line.size = bfd_get_section_size (sectp);
10926 else if (section_is_p (sectp->name, &names->loc_dwo))
10928 dwp_file->sections.loc.s.section = sectp;
10929 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
10931 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10933 dwp_file->sections.macinfo.s.section = sectp;
10934 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
10936 else if (section_is_p (sectp->name, &names->macro_dwo))
10938 dwp_file->sections.macro.s.section = sectp;
10939 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
10941 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10943 dwp_file->sections.str_offsets.s.section = sectp;
10944 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
10946 else if (section_is_p (sectp->name, &names->types_dwo))
10948 dwp_file->sections.types.s.section = sectp;
10949 dwp_file->sections.types.size = bfd_get_section_size (sectp);
10953 /* Hash function for dwp_file loaded CUs/TUs. */
10956 hash_dwp_loaded_cutus (const void *item)
10958 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
10960 /* This drops the top 32 bits of the signature, but is ok for a hash. */
10961 return dwo_unit->signature;
10964 /* Equality function for dwp_file loaded CUs/TUs. */
10967 eq_dwp_loaded_cutus (const void *a, const void *b)
10969 const struct dwo_unit *dua = (const struct dwo_unit *) a;
10970 const struct dwo_unit *dub = (const struct dwo_unit *) b;
10972 return dua->signature == dub->signature;
10975 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
10978 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
10980 return htab_create_alloc_ex (3,
10981 hash_dwp_loaded_cutus,
10982 eq_dwp_loaded_cutus,
10984 &objfile->objfile_obstack,
10985 hashtab_obstack_allocate,
10986 dummy_obstack_deallocate);
10989 /* Try to open DWP file FILE_NAME.
10990 The result is the bfd handle of the file.
10991 If there is a problem finding or opening the file, return NULL.
10992 Upon success, the canonicalized path of the file is stored in the bfd,
10993 same as symfile_bfd_open. */
10995 static gdb_bfd_ref_ptr
10996 open_dwp_file (const char *file_name)
10998 gdb_bfd_ref_ptr abfd (try_open_dwop_file (file_name, 1 /*is_dwp*/,
10999 1 /*search_cwd*/));
11003 /* Work around upstream bug 15652.
11004 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
11005 [Whether that's a "bug" is debatable, but it is getting in our way.]
11006 We have no real idea where the dwp file is, because gdb's realpath-ing
11007 of the executable's path may have discarded the needed info.
11008 [IWBN if the dwp file name was recorded in the executable, akin to
11009 .gnu_debuglink, but that doesn't exist yet.]
11010 Strip the directory from FILE_NAME and search again. */
11011 if (*debug_file_directory != '\0')
11013 /* Don't implicitly search the current directory here.
11014 If the user wants to search "." to handle this case,
11015 it must be added to debug-file-directory. */
11016 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
11023 /* Initialize the use of the DWP file for the current objfile.
11024 By convention the name of the DWP file is ${objfile}.dwp.
11025 The result is NULL if it can't be found. */
11027 static struct dwp_file *
11028 open_and_init_dwp_file (void)
11030 struct objfile *objfile = dwarf2_per_objfile->objfile;
11031 struct dwp_file *dwp_file;
11033 /* Try to find first .dwp for the binary file before any symbolic links
11036 /* If the objfile is a debug file, find the name of the real binary
11037 file and get the name of dwp file from there. */
11038 std::string dwp_name;
11039 if (objfile->separate_debug_objfile_backlink != NULL)
11041 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
11042 const char *backlink_basename = lbasename (backlink->original_name);
11044 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
11047 dwp_name = objfile->original_name;
11049 dwp_name += ".dwp";
11051 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwp_name.c_str ()));
11053 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
11055 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
11056 dwp_name = objfile_name (objfile);
11057 dwp_name += ".dwp";
11058 dbfd = open_dwp_file (dwp_name.c_str ());
11063 if (dwarf_read_debug)
11064 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
11067 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
11068 dwp_file->name = bfd_get_filename (dbfd.get ());
11069 dwp_file->dbfd = dbfd.release ();
11071 /* +1: section 0 is unused */
11072 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
11073 dwp_file->elf_sections =
11074 OBSTACK_CALLOC (&objfile->objfile_obstack,
11075 dwp_file->num_sections, asection *);
11077 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
11080 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
11082 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
11084 /* The DWP file version is stored in the hash table. Oh well. */
11085 if (dwp_file->cus->version != dwp_file->tus->version)
11087 /* Technically speaking, we should try to limp along, but this is
11088 pretty bizarre. We use pulongest here because that's the established
11089 portability solution (e.g, we cannot use %u for uint32_t). */
11090 error (_("Dwarf Error: DWP file CU version %s doesn't match"
11091 " TU version %s [in DWP file %s]"),
11092 pulongest (dwp_file->cus->version),
11093 pulongest (dwp_file->tus->version), dwp_name.c_str ());
11095 dwp_file->version = dwp_file->cus->version;
11097 if (dwp_file->version == 2)
11098 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
11101 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
11102 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
11104 if (dwarf_read_debug)
11106 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
11107 fprintf_unfiltered (gdb_stdlog,
11108 " %s CUs, %s TUs\n",
11109 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
11110 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
11116 /* Wrapper around open_and_init_dwp_file, only open it once. */
11118 static struct dwp_file *
11119 get_dwp_file (void)
11121 if (! dwarf2_per_objfile->dwp_checked)
11123 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
11124 dwarf2_per_objfile->dwp_checked = 1;
11126 return dwarf2_per_objfile->dwp_file;
11129 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
11130 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
11131 or in the DWP file for the objfile, referenced by THIS_UNIT.
11132 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
11133 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
11135 This is called, for example, when wanting to read a variable with a
11136 complex location. Therefore we don't want to do file i/o for every call.
11137 Therefore we don't want to look for a DWO file on every call.
11138 Therefore we first see if we've already seen SIGNATURE in a DWP file,
11139 then we check if we've already seen DWO_NAME, and only THEN do we check
11142 The result is a pointer to the dwo_unit object or NULL if we didn't find it
11143 (dwo_id mismatch or couldn't find the DWO/DWP file). */
11145 static struct dwo_unit *
11146 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
11147 const char *dwo_name, const char *comp_dir,
11148 ULONGEST signature, int is_debug_types)
11150 struct objfile *objfile = dwarf2_per_objfile->objfile;
11151 const char *kind = is_debug_types ? "TU" : "CU";
11152 void **dwo_file_slot;
11153 struct dwo_file *dwo_file;
11154 struct dwp_file *dwp_file;
11156 /* First see if there's a DWP file.
11157 If we have a DWP file but didn't find the DWO inside it, don't
11158 look for the original DWO file. It makes gdb behave differently
11159 depending on whether one is debugging in the build tree. */
11161 dwp_file = get_dwp_file ();
11162 if (dwp_file != NULL)
11164 const struct dwp_hash_table *dwp_htab =
11165 is_debug_types ? dwp_file->tus : dwp_file->cus;
11167 if (dwp_htab != NULL)
11169 struct dwo_unit *dwo_cutu =
11170 lookup_dwo_unit_in_dwp (dwp_file, comp_dir,
11171 signature, is_debug_types);
11173 if (dwo_cutu != NULL)
11175 if (dwarf_read_debug)
11177 fprintf_unfiltered (gdb_stdlog,
11178 "Virtual DWO %s %s found: @%s\n",
11179 kind, hex_string (signature),
11180 host_address_to_string (dwo_cutu));
11188 /* No DWP file, look for the DWO file. */
11190 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
11191 if (*dwo_file_slot == NULL)
11193 /* Read in the file and build a table of the CUs/TUs it contains. */
11194 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
11196 /* NOTE: This will be NULL if unable to open the file. */
11197 dwo_file = (struct dwo_file *) *dwo_file_slot;
11199 if (dwo_file != NULL)
11201 struct dwo_unit *dwo_cutu = NULL;
11203 if (is_debug_types && dwo_file->tus)
11205 struct dwo_unit find_dwo_cutu;
11207 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11208 find_dwo_cutu.signature = signature;
11210 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
11212 else if (!is_debug_types && dwo_file->cus)
11214 struct dwo_unit find_dwo_cutu;
11216 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11217 find_dwo_cutu.signature = signature;
11218 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
11222 if (dwo_cutu != NULL)
11224 if (dwarf_read_debug)
11226 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
11227 kind, dwo_name, hex_string (signature),
11228 host_address_to_string (dwo_cutu));
11235 /* We didn't find it. This could mean a dwo_id mismatch, or
11236 someone deleted the DWO/DWP file, or the search path isn't set up
11237 correctly to find the file. */
11239 if (dwarf_read_debug)
11241 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
11242 kind, dwo_name, hex_string (signature));
11245 /* This is a warning and not a complaint because it can be caused by
11246 pilot error (e.g., user accidentally deleting the DWO). */
11248 /* Print the name of the DWP file if we looked there, helps the user
11249 better diagnose the problem. */
11250 char *dwp_text = NULL;
11251 struct cleanup *cleanups;
11253 if (dwp_file != NULL)
11254 dwp_text = xstrprintf (" [in DWP file %s]", lbasename (dwp_file->name));
11255 cleanups = make_cleanup (xfree, dwp_text);
11257 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
11258 " [in module %s]"),
11259 kind, dwo_name, hex_string (signature),
11260 dwp_text != NULL ? dwp_text : "",
11261 this_unit->is_debug_types ? "TU" : "CU",
11262 to_underlying (this_unit->sect_off), objfile_name (objfile));
11264 do_cleanups (cleanups);
11269 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
11270 See lookup_dwo_cutu_unit for details. */
11272 static struct dwo_unit *
11273 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
11274 const char *dwo_name, const char *comp_dir,
11275 ULONGEST signature)
11277 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
11280 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
11281 See lookup_dwo_cutu_unit for details. */
11283 static struct dwo_unit *
11284 lookup_dwo_type_unit (struct signatured_type *this_tu,
11285 const char *dwo_name, const char *comp_dir)
11287 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
11290 /* Traversal function for queue_and_load_all_dwo_tus. */
11293 queue_and_load_dwo_tu (void **slot, void *info)
11295 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
11296 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
11297 ULONGEST signature = dwo_unit->signature;
11298 struct signatured_type *sig_type =
11299 lookup_dwo_signatured_type (per_cu->cu, signature);
11301 if (sig_type != NULL)
11303 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
11305 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
11306 a real dependency of PER_CU on SIG_TYPE. That is detected later
11307 while processing PER_CU. */
11308 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
11309 load_full_type_unit (sig_cu);
11310 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
11316 /* Queue all TUs contained in the DWO of PER_CU to be read in.
11317 The DWO may have the only definition of the type, though it may not be
11318 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
11319 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
11322 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
11324 struct dwo_unit *dwo_unit;
11325 struct dwo_file *dwo_file;
11327 gdb_assert (!per_cu->is_debug_types);
11328 gdb_assert (get_dwp_file () == NULL);
11329 gdb_assert (per_cu->cu != NULL);
11331 dwo_unit = per_cu->cu->dwo_unit;
11332 gdb_assert (dwo_unit != NULL);
11334 dwo_file = dwo_unit->dwo_file;
11335 if (dwo_file->tus != NULL)
11336 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
11339 /* Free all resources associated with DWO_FILE.
11340 Close the DWO file and munmap the sections.
11341 All memory should be on the objfile obstack. */
11344 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
11347 /* Note: dbfd is NULL for virtual DWO files. */
11348 gdb_bfd_unref (dwo_file->dbfd);
11350 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
11353 /* Wrapper for free_dwo_file for use in cleanups. */
11356 free_dwo_file_cleanup (void *arg)
11358 struct dwo_file *dwo_file = (struct dwo_file *) arg;
11359 struct objfile *objfile = dwarf2_per_objfile->objfile;
11361 free_dwo_file (dwo_file, objfile);
11364 /* Traversal function for free_dwo_files. */
11367 free_dwo_file_from_slot (void **slot, void *info)
11369 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
11370 struct objfile *objfile = (struct objfile *) info;
11372 free_dwo_file (dwo_file, objfile);
11377 /* Free all resources associated with DWO_FILES. */
11380 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
11382 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
11385 /* Read in various DIEs. */
11387 /* qsort helper for inherit_abstract_dies. */
11390 unsigned_int_compar (const void *ap, const void *bp)
11392 unsigned int a = *(unsigned int *) ap;
11393 unsigned int b = *(unsigned int *) bp;
11395 return (a > b) - (b > a);
11398 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
11399 Inherit only the children of the DW_AT_abstract_origin DIE not being
11400 already referenced by DW_AT_abstract_origin from the children of the
11404 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
11406 struct die_info *child_die;
11407 unsigned die_children_count;
11408 /* CU offsets which were referenced by children of the current DIE. */
11409 sect_offset *offsets;
11410 sect_offset *offsets_end, *offsetp;
11411 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
11412 struct die_info *origin_die;
11413 /* Iterator of the ORIGIN_DIE children. */
11414 struct die_info *origin_child_die;
11415 struct cleanup *cleanups;
11416 struct attribute *attr;
11417 struct dwarf2_cu *origin_cu;
11418 struct pending **origin_previous_list_in_scope;
11420 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
11424 /* Note that following die references may follow to a die in a
11428 origin_die = follow_die_ref (die, attr, &origin_cu);
11430 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
11432 origin_previous_list_in_scope = origin_cu->list_in_scope;
11433 origin_cu->list_in_scope = cu->list_in_scope;
11435 if (die->tag != origin_die->tag
11436 && !(die->tag == DW_TAG_inlined_subroutine
11437 && origin_die->tag == DW_TAG_subprogram))
11438 complaint (&symfile_complaints,
11439 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
11440 to_underlying (die->sect_off),
11441 to_underlying (origin_die->sect_off));
11443 child_die = die->child;
11444 die_children_count = 0;
11445 while (child_die && child_die->tag)
11447 child_die = sibling_die (child_die);
11448 die_children_count++;
11450 offsets = XNEWVEC (sect_offset, die_children_count);
11451 cleanups = make_cleanup (xfree, offsets);
11453 offsets_end = offsets;
11454 for (child_die = die->child;
11455 child_die && child_die->tag;
11456 child_die = sibling_die (child_die))
11458 struct die_info *child_origin_die;
11459 struct dwarf2_cu *child_origin_cu;
11461 /* We are trying to process concrete instance entries:
11462 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
11463 it's not relevant to our analysis here. i.e. detecting DIEs that are
11464 present in the abstract instance but not referenced in the concrete
11466 if (child_die->tag == DW_TAG_call_site
11467 || child_die->tag == DW_TAG_GNU_call_site)
11470 /* For each CHILD_DIE, find the corresponding child of
11471 ORIGIN_DIE. If there is more than one layer of
11472 DW_AT_abstract_origin, follow them all; there shouldn't be,
11473 but GCC versions at least through 4.4 generate this (GCC PR
11475 child_origin_die = child_die;
11476 child_origin_cu = cu;
11479 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
11483 child_origin_die = follow_die_ref (child_origin_die, attr,
11487 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
11488 counterpart may exist. */
11489 if (child_origin_die != child_die)
11491 if (child_die->tag != child_origin_die->tag
11492 && !(child_die->tag == DW_TAG_inlined_subroutine
11493 && child_origin_die->tag == DW_TAG_subprogram))
11494 complaint (&symfile_complaints,
11495 _("Child DIE 0x%x and its abstract origin 0x%x have "
11497 to_underlying (child_die->sect_off),
11498 to_underlying (child_origin_die->sect_off));
11499 if (child_origin_die->parent != origin_die)
11500 complaint (&symfile_complaints,
11501 _("Child DIE 0x%x and its abstract origin 0x%x have "
11502 "different parents"),
11503 to_underlying (child_die->sect_off),
11504 to_underlying (child_origin_die->sect_off));
11506 *offsets_end++ = child_origin_die->sect_off;
11509 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
11510 unsigned_int_compar);
11511 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
11512 if (offsetp[-1] == *offsetp)
11513 complaint (&symfile_complaints,
11514 _("Multiple children of DIE 0x%x refer "
11515 "to DIE 0x%x as their abstract origin"),
11516 to_underlying (die->sect_off), to_underlying (*offsetp));
11519 origin_child_die = origin_die->child;
11520 while (origin_child_die && origin_child_die->tag)
11522 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
11523 while (offsetp < offsets_end
11524 && *offsetp < origin_child_die->sect_off)
11526 if (offsetp >= offsets_end
11527 || *offsetp > origin_child_die->sect_off)
11529 /* Found that ORIGIN_CHILD_DIE is really not referenced.
11530 Check whether we're already processing ORIGIN_CHILD_DIE.
11531 This can happen with mutually referenced abstract_origins.
11533 if (!origin_child_die->in_process)
11534 process_die (origin_child_die, origin_cu);
11536 origin_child_die = sibling_die (origin_child_die);
11538 origin_cu->list_in_scope = origin_previous_list_in_scope;
11540 do_cleanups (cleanups);
11544 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
11546 struct objfile *objfile = cu->objfile;
11547 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11548 struct context_stack *newobj;
11551 struct die_info *child_die;
11552 struct attribute *attr, *call_line, *call_file;
11554 CORE_ADDR baseaddr;
11555 struct block *block;
11556 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
11557 VEC (symbolp) *template_args = NULL;
11558 struct template_symbol *templ_func = NULL;
11562 /* If we do not have call site information, we can't show the
11563 caller of this inlined function. That's too confusing, so
11564 only use the scope for local variables. */
11565 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
11566 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
11567 if (call_line == NULL || call_file == NULL)
11569 read_lexical_block_scope (die, cu);
11574 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11576 name = dwarf2_name (die, cu);
11578 /* Ignore functions with missing or empty names. These are actually
11579 illegal according to the DWARF standard. */
11582 complaint (&symfile_complaints,
11583 _("missing name for subprogram DIE at %d"),
11584 to_underlying (die->sect_off));
11588 /* Ignore functions with missing or invalid low and high pc attributes. */
11589 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
11590 <= PC_BOUNDS_INVALID)
11592 attr = dwarf2_attr (die, DW_AT_external, cu);
11593 if (!attr || !DW_UNSND (attr))
11594 complaint (&symfile_complaints,
11595 _("cannot get low and high bounds "
11596 "for subprogram DIE at %d"),
11597 to_underlying (die->sect_off));
11601 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11602 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11604 /* If we have any template arguments, then we must allocate a
11605 different sort of symbol. */
11606 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
11608 if (child_die->tag == DW_TAG_template_type_param
11609 || child_die->tag == DW_TAG_template_value_param)
11611 templ_func = allocate_template_symbol (objfile);
11612 templ_func->base.is_cplus_template_function = 1;
11617 newobj = push_context (0, lowpc);
11618 newobj->name = new_symbol_full (die, read_type_die (die, cu), cu,
11619 (struct symbol *) templ_func);
11621 /* If there is a location expression for DW_AT_frame_base, record
11623 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
11625 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
11627 /* If there is a location for the static link, record it. */
11628 newobj->static_link = NULL;
11629 attr = dwarf2_attr (die, DW_AT_static_link, cu);
11632 newobj->static_link
11633 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
11634 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
11637 cu->list_in_scope = &local_symbols;
11639 if (die->child != NULL)
11641 child_die = die->child;
11642 while (child_die && child_die->tag)
11644 if (child_die->tag == DW_TAG_template_type_param
11645 || child_die->tag == DW_TAG_template_value_param)
11647 struct symbol *arg = new_symbol (child_die, NULL, cu);
11650 VEC_safe_push (symbolp, template_args, arg);
11653 process_die (child_die, cu);
11654 child_die = sibling_die (child_die);
11658 inherit_abstract_dies (die, cu);
11660 /* If we have a DW_AT_specification, we might need to import using
11661 directives from the context of the specification DIE. See the
11662 comment in determine_prefix. */
11663 if (cu->language == language_cplus
11664 && dwarf2_attr (die, DW_AT_specification, cu))
11666 struct dwarf2_cu *spec_cu = cu;
11667 struct die_info *spec_die = die_specification (die, &spec_cu);
11671 child_die = spec_die->child;
11672 while (child_die && child_die->tag)
11674 if (child_die->tag == DW_TAG_imported_module)
11675 process_die (child_die, spec_cu);
11676 child_die = sibling_die (child_die);
11679 /* In some cases, GCC generates specification DIEs that
11680 themselves contain DW_AT_specification attributes. */
11681 spec_die = die_specification (spec_die, &spec_cu);
11685 newobj = pop_context ();
11686 /* Make a block for the local symbols within. */
11687 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
11688 newobj->static_link, lowpc, highpc);
11690 /* For C++, set the block's scope. */
11691 if ((cu->language == language_cplus
11692 || cu->language == language_fortran
11693 || cu->language == language_d
11694 || cu->language == language_rust)
11695 && cu->processing_has_namespace_info)
11696 block_set_scope (block, determine_prefix (die, cu),
11697 &objfile->objfile_obstack);
11699 /* If we have address ranges, record them. */
11700 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11702 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
11704 /* Attach template arguments to function. */
11705 if (! VEC_empty (symbolp, template_args))
11707 gdb_assert (templ_func != NULL);
11709 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
11710 templ_func->template_arguments
11711 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
11712 templ_func->n_template_arguments);
11713 memcpy (templ_func->template_arguments,
11714 VEC_address (symbolp, template_args),
11715 (templ_func->n_template_arguments * sizeof (struct symbol *)));
11716 VEC_free (symbolp, template_args);
11719 /* In C++, we can have functions nested inside functions (e.g., when
11720 a function declares a class that has methods). This means that
11721 when we finish processing a function scope, we may need to go
11722 back to building a containing block's symbol lists. */
11723 local_symbols = newobj->locals;
11724 local_using_directives = newobj->local_using_directives;
11726 /* If we've finished processing a top-level function, subsequent
11727 symbols go in the file symbol list. */
11728 if (outermost_context_p ())
11729 cu->list_in_scope = &file_symbols;
11732 /* Process all the DIES contained within a lexical block scope. Start
11733 a new scope, process the dies, and then close the scope. */
11736 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
11738 struct objfile *objfile = cu->objfile;
11739 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11740 struct context_stack *newobj;
11741 CORE_ADDR lowpc, highpc;
11742 struct die_info *child_die;
11743 CORE_ADDR baseaddr;
11745 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11747 /* Ignore blocks with missing or invalid low and high pc attributes. */
11748 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
11749 as multiple lexical blocks? Handling children in a sane way would
11750 be nasty. Might be easier to properly extend generic blocks to
11751 describe ranges. */
11752 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
11754 case PC_BOUNDS_NOT_PRESENT:
11755 /* DW_TAG_lexical_block has no attributes, process its children as if
11756 there was no wrapping by that DW_TAG_lexical_block.
11757 GCC does no longer produces such DWARF since GCC r224161. */
11758 for (child_die = die->child;
11759 child_die != NULL && child_die->tag;
11760 child_die = sibling_die (child_die))
11761 process_die (child_die, cu);
11763 case PC_BOUNDS_INVALID:
11766 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11767 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11769 push_context (0, lowpc);
11770 if (die->child != NULL)
11772 child_die = die->child;
11773 while (child_die && child_die->tag)
11775 process_die (child_die, cu);
11776 child_die = sibling_die (child_die);
11779 inherit_abstract_dies (die, cu);
11780 newobj = pop_context ();
11782 if (local_symbols != NULL || local_using_directives != NULL)
11784 struct block *block
11785 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
11786 newobj->start_addr, highpc);
11788 /* Note that recording ranges after traversing children, as we
11789 do here, means that recording a parent's ranges entails
11790 walking across all its children's ranges as they appear in
11791 the address map, which is quadratic behavior.
11793 It would be nicer to record the parent's ranges before
11794 traversing its children, simply overriding whatever you find
11795 there. But since we don't even decide whether to create a
11796 block until after we've traversed its children, that's hard
11798 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11800 local_symbols = newobj->locals;
11801 local_using_directives = newobj->local_using_directives;
11804 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
11807 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
11809 struct objfile *objfile = cu->objfile;
11810 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11811 CORE_ADDR pc, baseaddr;
11812 struct attribute *attr;
11813 struct call_site *call_site, call_site_local;
11816 struct die_info *child_die;
11818 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11820 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
11823 /* This was a pre-DWARF-5 GNU extension alias
11824 for DW_AT_call_return_pc. */
11825 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11829 complaint (&symfile_complaints,
11830 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
11831 "DIE 0x%x [in module %s]"),
11832 to_underlying (die->sect_off), objfile_name (objfile));
11835 pc = attr_value_as_address (attr) + baseaddr;
11836 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
11838 if (cu->call_site_htab == NULL)
11839 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
11840 NULL, &objfile->objfile_obstack,
11841 hashtab_obstack_allocate, NULL);
11842 call_site_local.pc = pc;
11843 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
11846 complaint (&symfile_complaints,
11847 _("Duplicate PC %s for DW_TAG_call_site "
11848 "DIE 0x%x [in module %s]"),
11849 paddress (gdbarch, pc), to_underlying (die->sect_off),
11850 objfile_name (objfile));
11854 /* Count parameters at the caller. */
11857 for (child_die = die->child; child_die && child_die->tag;
11858 child_die = sibling_die (child_die))
11860 if (child_die->tag != DW_TAG_call_site_parameter
11861 && child_die->tag != DW_TAG_GNU_call_site_parameter)
11863 complaint (&symfile_complaints,
11864 _("Tag %d is not DW_TAG_call_site_parameter in "
11865 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
11866 child_die->tag, to_underlying (child_die->sect_off),
11867 objfile_name (objfile));
11875 = ((struct call_site *)
11876 obstack_alloc (&objfile->objfile_obstack,
11877 sizeof (*call_site)
11878 + (sizeof (*call_site->parameter) * (nparams - 1))));
11880 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
11881 call_site->pc = pc;
11883 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
11884 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
11886 struct die_info *func_die;
11888 /* Skip also over DW_TAG_inlined_subroutine. */
11889 for (func_die = die->parent;
11890 func_die && func_die->tag != DW_TAG_subprogram
11891 && func_die->tag != DW_TAG_subroutine_type;
11892 func_die = func_die->parent);
11894 /* DW_AT_call_all_calls is a superset
11895 of DW_AT_call_all_tail_calls. */
11897 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
11898 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
11899 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
11900 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
11902 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
11903 not complete. But keep CALL_SITE for look ups via call_site_htab,
11904 both the initial caller containing the real return address PC and
11905 the final callee containing the current PC of a chain of tail
11906 calls do not need to have the tail call list complete. But any
11907 function candidate for a virtual tail call frame searched via
11908 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
11909 determined unambiguously. */
11913 struct type *func_type = NULL;
11916 func_type = get_die_type (func_die, cu);
11917 if (func_type != NULL)
11919 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
11921 /* Enlist this call site to the function. */
11922 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
11923 TYPE_TAIL_CALL_LIST (func_type) = call_site;
11926 complaint (&symfile_complaints,
11927 _("Cannot find function owning DW_TAG_call_site "
11928 "DIE 0x%x [in module %s]"),
11929 to_underlying (die->sect_off), objfile_name (objfile));
11933 attr = dwarf2_attr (die, DW_AT_call_target, cu);
11935 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
11937 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
11940 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
11941 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
11943 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
11944 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
11945 /* Keep NULL DWARF_BLOCK. */;
11946 else if (attr_form_is_block (attr))
11948 struct dwarf2_locexpr_baton *dlbaton;
11950 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
11951 dlbaton->data = DW_BLOCK (attr)->data;
11952 dlbaton->size = DW_BLOCK (attr)->size;
11953 dlbaton->per_cu = cu->per_cu;
11955 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
11957 else if (attr_form_is_ref (attr))
11959 struct dwarf2_cu *target_cu = cu;
11960 struct die_info *target_die;
11962 target_die = follow_die_ref (die, attr, &target_cu);
11963 gdb_assert (target_cu->objfile == objfile);
11964 if (die_is_declaration (target_die, target_cu))
11966 const char *target_physname;
11968 /* Prefer the mangled name; otherwise compute the demangled one. */
11969 target_physname = dwarf2_string_attr (target_die,
11970 DW_AT_linkage_name,
11972 if (target_physname == NULL)
11973 target_physname = dwarf2_string_attr (target_die,
11974 DW_AT_MIPS_linkage_name,
11976 if (target_physname == NULL)
11977 target_physname = dwarf2_physname (NULL, target_die, target_cu);
11978 if (target_physname == NULL)
11979 complaint (&symfile_complaints,
11980 _("DW_AT_call_target target DIE has invalid "
11981 "physname, for referencing DIE 0x%x [in module %s]"),
11982 to_underlying (die->sect_off), objfile_name (objfile));
11984 SET_FIELD_PHYSNAME (call_site->target, target_physname);
11990 /* DW_AT_entry_pc should be preferred. */
11991 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
11992 <= PC_BOUNDS_INVALID)
11993 complaint (&symfile_complaints,
11994 _("DW_AT_call_target target DIE has invalid "
11995 "low pc, for referencing DIE 0x%x [in module %s]"),
11996 to_underlying (die->sect_off), objfile_name (objfile));
11999 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
12000 SET_FIELD_PHYSADDR (call_site->target, lowpc);
12005 complaint (&symfile_complaints,
12006 _("DW_TAG_call_site DW_AT_call_target is neither "
12007 "block nor reference, for DIE 0x%x [in module %s]"),
12008 to_underlying (die->sect_off), objfile_name (objfile));
12010 call_site->per_cu = cu->per_cu;
12012 for (child_die = die->child;
12013 child_die && child_die->tag;
12014 child_die = sibling_die (child_die))
12016 struct call_site_parameter *parameter;
12017 struct attribute *loc, *origin;
12019 if (child_die->tag != DW_TAG_call_site_parameter
12020 && child_die->tag != DW_TAG_GNU_call_site_parameter)
12022 /* Already printed the complaint above. */
12026 gdb_assert (call_site->parameter_count < nparams);
12027 parameter = &call_site->parameter[call_site->parameter_count];
12029 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
12030 specifies DW_TAG_formal_parameter. Value of the data assumed for the
12031 register is contained in DW_AT_call_value. */
12033 loc = dwarf2_attr (child_die, DW_AT_location, cu);
12034 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
12035 if (origin == NULL)
12037 /* This was a pre-DWARF-5 GNU extension alias
12038 for DW_AT_call_parameter. */
12039 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
12041 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
12043 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
12045 sect_offset sect_off
12046 = (sect_offset) dwarf2_get_ref_die_offset (origin);
12047 if (!offset_in_cu_p (&cu->header, sect_off))
12049 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
12050 binding can be done only inside one CU. Such referenced DIE
12051 therefore cannot be even moved to DW_TAG_partial_unit. */
12052 complaint (&symfile_complaints,
12053 _("DW_AT_call_parameter offset is not in CU for "
12054 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12055 to_underlying (child_die->sect_off),
12056 objfile_name (objfile));
12059 parameter->u.param_cu_off
12060 = (cu_offset) (sect_off - cu->header.sect_off);
12062 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
12064 complaint (&symfile_complaints,
12065 _("No DW_FORM_block* DW_AT_location for "
12066 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12067 to_underlying (child_die->sect_off), objfile_name (objfile));
12072 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
12073 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
12074 if (parameter->u.dwarf_reg != -1)
12075 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
12076 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
12077 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
12078 ¶meter->u.fb_offset))
12079 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
12082 complaint (&symfile_complaints,
12083 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
12084 "for DW_FORM_block* DW_AT_location is supported for "
12085 "DW_TAG_call_site child DIE 0x%x "
12087 to_underlying (child_die->sect_off),
12088 objfile_name (objfile));
12093 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
12095 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
12096 if (!attr_form_is_block (attr))
12098 complaint (&symfile_complaints,
12099 _("No DW_FORM_block* DW_AT_call_value for "
12100 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12101 to_underlying (child_die->sect_off),
12102 objfile_name (objfile));
12105 parameter->value = DW_BLOCK (attr)->data;
12106 parameter->value_size = DW_BLOCK (attr)->size;
12108 /* Parameters are not pre-cleared by memset above. */
12109 parameter->data_value = NULL;
12110 parameter->data_value_size = 0;
12111 call_site->parameter_count++;
12113 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
12115 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
12118 if (!attr_form_is_block (attr))
12119 complaint (&symfile_complaints,
12120 _("No DW_FORM_block* DW_AT_call_data_value for "
12121 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12122 to_underlying (child_die->sect_off),
12123 objfile_name (objfile));
12126 parameter->data_value = DW_BLOCK (attr)->data;
12127 parameter->data_value_size = DW_BLOCK (attr)->size;
12133 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
12134 reading .debug_rnglists.
12135 Callback's type should be:
12136 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
12137 Return true if the attributes are present and valid, otherwise,
12140 template <typename Callback>
12142 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
12143 Callback &&callback)
12145 struct objfile *objfile = cu->objfile;
12146 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12147 struct comp_unit_head *cu_header = &cu->header;
12148 bfd *obfd = objfile->obfd;
12149 unsigned int addr_size = cu_header->addr_size;
12150 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12151 /* Base address selection entry. */
12154 unsigned int dummy;
12155 const gdb_byte *buffer;
12157 CORE_ADDR high = 0;
12158 CORE_ADDR baseaddr;
12159 bool overflow = false;
12161 found_base = cu->base_known;
12162 base = cu->base_address;
12164 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
12165 if (offset >= dwarf2_per_objfile->rnglists.size)
12167 complaint (&symfile_complaints,
12168 _("Offset %d out of bounds for DW_AT_ranges attribute"),
12172 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
12174 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12178 /* Initialize it due to a false compiler warning. */
12179 CORE_ADDR range_beginning = 0, range_end = 0;
12180 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
12181 + dwarf2_per_objfile->rnglists.size);
12182 unsigned int bytes_read;
12184 if (buffer == buf_end)
12189 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
12192 case DW_RLE_end_of_list:
12194 case DW_RLE_base_address:
12195 if (buffer + cu->header.addr_size > buf_end)
12200 base = read_address (obfd, buffer, cu, &bytes_read);
12202 buffer += bytes_read;
12204 case DW_RLE_start_length:
12205 if (buffer + cu->header.addr_size > buf_end)
12210 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12211 buffer += bytes_read;
12212 range_end = (range_beginning
12213 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
12214 buffer += bytes_read;
12215 if (buffer > buf_end)
12221 case DW_RLE_offset_pair:
12222 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12223 buffer += bytes_read;
12224 if (buffer > buf_end)
12229 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12230 buffer += bytes_read;
12231 if (buffer > buf_end)
12237 case DW_RLE_start_end:
12238 if (buffer + 2 * cu->header.addr_size > buf_end)
12243 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12244 buffer += bytes_read;
12245 range_end = read_address (obfd, buffer, cu, &bytes_read);
12246 buffer += bytes_read;
12249 complaint (&symfile_complaints,
12250 _("Invalid .debug_rnglists data (no base address)"));
12253 if (rlet == DW_RLE_end_of_list || overflow)
12255 if (rlet == DW_RLE_base_address)
12260 /* We have no valid base address for the ranges
12262 complaint (&symfile_complaints,
12263 _("Invalid .debug_rnglists data (no base address)"));
12267 if (range_beginning > range_end)
12269 /* Inverted range entries are invalid. */
12270 complaint (&symfile_complaints,
12271 _("Invalid .debug_rnglists data (inverted range)"));
12275 /* Empty range entries have no effect. */
12276 if (range_beginning == range_end)
12279 range_beginning += base;
12282 /* A not-uncommon case of bad debug info.
12283 Don't pollute the addrmap with bad data. */
12284 if (range_beginning + baseaddr == 0
12285 && !dwarf2_per_objfile->has_section_at_zero)
12287 complaint (&symfile_complaints,
12288 _(".debug_rnglists entry has start address of zero"
12289 " [in module %s]"), objfile_name (objfile));
12293 callback (range_beginning, range_end);
12298 complaint (&symfile_complaints,
12299 _("Offset %d is not terminated "
12300 "for DW_AT_ranges attribute"),
12308 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
12309 Callback's type should be:
12310 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
12311 Return 1 if the attributes are present and valid, otherwise, return 0. */
12313 template <typename Callback>
12315 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
12316 Callback &&callback)
12318 struct objfile *objfile = cu->objfile;
12319 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12320 struct comp_unit_head *cu_header = &cu->header;
12321 bfd *obfd = objfile->obfd;
12322 unsigned int addr_size = cu_header->addr_size;
12323 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12324 /* Base address selection entry. */
12327 unsigned int dummy;
12328 const gdb_byte *buffer;
12329 CORE_ADDR baseaddr;
12331 if (cu_header->version >= 5)
12332 return dwarf2_rnglists_process (offset, cu, callback);
12334 found_base = cu->base_known;
12335 base = cu->base_address;
12337 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
12338 if (offset >= dwarf2_per_objfile->ranges.size)
12340 complaint (&symfile_complaints,
12341 _("Offset %d out of bounds for DW_AT_ranges attribute"),
12345 buffer = dwarf2_per_objfile->ranges.buffer + offset;
12347 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12351 CORE_ADDR range_beginning, range_end;
12353 range_beginning = read_address (obfd, buffer, cu, &dummy);
12354 buffer += addr_size;
12355 range_end = read_address (obfd, buffer, cu, &dummy);
12356 buffer += addr_size;
12357 offset += 2 * addr_size;
12359 /* An end of list marker is a pair of zero addresses. */
12360 if (range_beginning == 0 && range_end == 0)
12361 /* Found the end of list entry. */
12364 /* Each base address selection entry is a pair of 2 values.
12365 The first is the largest possible address, the second is
12366 the base address. Check for a base address here. */
12367 if ((range_beginning & mask) == mask)
12369 /* If we found the largest possible address, then we already
12370 have the base address in range_end. */
12378 /* We have no valid base address for the ranges
12380 complaint (&symfile_complaints,
12381 _("Invalid .debug_ranges data (no base address)"));
12385 if (range_beginning > range_end)
12387 /* Inverted range entries are invalid. */
12388 complaint (&symfile_complaints,
12389 _("Invalid .debug_ranges data (inverted range)"));
12393 /* Empty range entries have no effect. */
12394 if (range_beginning == range_end)
12397 range_beginning += base;
12400 /* A not-uncommon case of bad debug info.
12401 Don't pollute the addrmap with bad data. */
12402 if (range_beginning + baseaddr == 0
12403 && !dwarf2_per_objfile->has_section_at_zero)
12405 complaint (&symfile_complaints,
12406 _(".debug_ranges entry has start address of zero"
12407 " [in module %s]"), objfile_name (objfile));
12411 callback (range_beginning, range_end);
12417 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
12418 Return 1 if the attributes are present and valid, otherwise, return 0.
12419 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
12422 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
12423 CORE_ADDR *high_return, struct dwarf2_cu *cu,
12424 struct partial_symtab *ranges_pst)
12426 struct objfile *objfile = cu->objfile;
12427 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12428 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
12429 SECT_OFF_TEXT (objfile));
12432 CORE_ADDR high = 0;
12435 retval = dwarf2_ranges_process (offset, cu,
12436 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
12438 if (ranges_pst != NULL)
12443 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12444 range_beginning + baseaddr);
12445 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12446 range_end + baseaddr);
12447 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
12451 /* FIXME: This is recording everything as a low-high
12452 segment of consecutive addresses. We should have a
12453 data structure for discontiguous block ranges
12457 low = range_beginning;
12463 if (range_beginning < low)
12464 low = range_beginning;
12465 if (range_end > high)
12473 /* If the first entry is an end-of-list marker, the range
12474 describes an empty scope, i.e. no instructions. */
12480 *high_return = high;
12484 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
12485 definition for the return value. *LOWPC and *HIGHPC are set iff
12486 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
12488 static enum pc_bounds_kind
12489 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
12490 CORE_ADDR *highpc, struct dwarf2_cu *cu,
12491 struct partial_symtab *pst)
12493 struct attribute *attr;
12494 struct attribute *attr_high;
12496 CORE_ADDR high = 0;
12497 enum pc_bounds_kind ret;
12499 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12502 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12505 low = attr_value_as_address (attr);
12506 high = attr_value_as_address (attr_high);
12507 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12511 /* Found high w/o low attribute. */
12512 return PC_BOUNDS_INVALID;
12514 /* Found consecutive range of addresses. */
12515 ret = PC_BOUNDS_HIGH_LOW;
12519 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12522 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12523 We take advantage of the fact that DW_AT_ranges does not appear
12524 in DW_TAG_compile_unit of DWO files. */
12525 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12526 unsigned int ranges_offset = (DW_UNSND (attr)
12527 + (need_ranges_base
12531 /* Value of the DW_AT_ranges attribute is the offset in the
12532 .debug_ranges section. */
12533 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
12534 return PC_BOUNDS_INVALID;
12535 /* Found discontinuous range of addresses. */
12536 ret = PC_BOUNDS_RANGES;
12539 return PC_BOUNDS_NOT_PRESENT;
12542 /* read_partial_die has also the strict LOW < HIGH requirement. */
12544 return PC_BOUNDS_INVALID;
12546 /* When using the GNU linker, .gnu.linkonce. sections are used to
12547 eliminate duplicate copies of functions and vtables and such.
12548 The linker will arbitrarily choose one and discard the others.
12549 The AT_*_pc values for such functions refer to local labels in
12550 these sections. If the section from that file was discarded, the
12551 labels are not in the output, so the relocs get a value of 0.
12552 If this is a discarded function, mark the pc bounds as invalid,
12553 so that GDB will ignore it. */
12554 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
12555 return PC_BOUNDS_INVALID;
12563 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
12564 its low and high PC addresses. Do nothing if these addresses could not
12565 be determined. Otherwise, set LOWPC to the low address if it is smaller,
12566 and HIGHPC to the high address if greater than HIGHPC. */
12569 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
12570 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12571 struct dwarf2_cu *cu)
12573 CORE_ADDR low, high;
12574 struct die_info *child = die->child;
12576 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
12578 *lowpc = std::min (*lowpc, low);
12579 *highpc = std::max (*highpc, high);
12582 /* If the language does not allow nested subprograms (either inside
12583 subprograms or lexical blocks), we're done. */
12584 if (cu->language != language_ada)
12587 /* Check all the children of the given DIE. If it contains nested
12588 subprograms, then check their pc bounds. Likewise, we need to
12589 check lexical blocks as well, as they may also contain subprogram
12591 while (child && child->tag)
12593 if (child->tag == DW_TAG_subprogram
12594 || child->tag == DW_TAG_lexical_block)
12595 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
12596 child = sibling_die (child);
12600 /* Get the low and high pc's represented by the scope DIE, and store
12601 them in *LOWPC and *HIGHPC. If the correct values can't be
12602 determined, set *LOWPC to -1 and *HIGHPC to 0. */
12605 get_scope_pc_bounds (struct die_info *die,
12606 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12607 struct dwarf2_cu *cu)
12609 CORE_ADDR best_low = (CORE_ADDR) -1;
12610 CORE_ADDR best_high = (CORE_ADDR) 0;
12611 CORE_ADDR current_low, current_high;
12613 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
12614 >= PC_BOUNDS_RANGES)
12616 best_low = current_low;
12617 best_high = current_high;
12621 struct die_info *child = die->child;
12623 while (child && child->tag)
12625 switch (child->tag) {
12626 case DW_TAG_subprogram:
12627 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
12629 case DW_TAG_namespace:
12630 case DW_TAG_module:
12631 /* FIXME: carlton/2004-01-16: Should we do this for
12632 DW_TAG_class_type/DW_TAG_structure_type, too? I think
12633 that current GCC's always emit the DIEs corresponding
12634 to definitions of methods of classes as children of a
12635 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
12636 the DIEs giving the declarations, which could be
12637 anywhere). But I don't see any reason why the
12638 standards says that they have to be there. */
12639 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
12641 if (current_low != ((CORE_ADDR) -1))
12643 best_low = std::min (best_low, current_low);
12644 best_high = std::max (best_high, current_high);
12652 child = sibling_die (child);
12657 *highpc = best_high;
12660 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
12664 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
12665 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
12667 struct objfile *objfile = cu->objfile;
12668 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12669 struct attribute *attr;
12670 struct attribute *attr_high;
12672 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12675 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12678 CORE_ADDR low = attr_value_as_address (attr);
12679 CORE_ADDR high = attr_value_as_address (attr_high);
12681 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12684 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
12685 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
12686 record_block_range (block, low, high - 1);
12690 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12693 bfd *obfd = objfile->obfd;
12694 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12695 We take advantage of the fact that DW_AT_ranges does not appear
12696 in DW_TAG_compile_unit of DWO files. */
12697 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12699 /* The value of the DW_AT_ranges attribute is the offset of the
12700 address range list in the .debug_ranges section. */
12701 unsigned long offset = (DW_UNSND (attr)
12702 + (need_ranges_base ? cu->ranges_base : 0));
12703 const gdb_byte *buffer;
12705 /* For some target architectures, but not others, the
12706 read_address function sign-extends the addresses it returns.
12707 To recognize base address selection entries, we need a
12709 unsigned int addr_size = cu->header.addr_size;
12710 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12712 /* The base address, to which the next pair is relative. Note
12713 that this 'base' is a DWARF concept: most entries in a range
12714 list are relative, to reduce the number of relocs against the
12715 debugging information. This is separate from this function's
12716 'baseaddr' argument, which GDB uses to relocate debugging
12717 information from a shared library based on the address at
12718 which the library was loaded. */
12719 CORE_ADDR base = cu->base_address;
12720 int base_known = cu->base_known;
12722 dwarf2_ranges_process (offset, cu,
12723 [&] (CORE_ADDR start, CORE_ADDR end)
12727 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
12728 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
12729 record_block_range (block, start, end - 1);
12734 /* Check whether the producer field indicates either of GCC < 4.6, or the
12735 Intel C/C++ compiler, and cache the result in CU. */
12738 check_producer (struct dwarf2_cu *cu)
12742 if (cu->producer == NULL)
12744 /* For unknown compilers expect their behavior is DWARF version
12747 GCC started to support .debug_types sections by -gdwarf-4 since
12748 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
12749 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
12750 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
12751 interpreted incorrectly by GDB now - GCC PR debug/48229. */
12753 else if (producer_is_gcc (cu->producer, &major, &minor))
12755 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
12756 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
12758 else if (startswith (cu->producer, "Intel(R) C"))
12759 cu->producer_is_icc = 1;
12762 /* For other non-GCC compilers, expect their behavior is DWARF version
12766 cu->checked_producer = 1;
12769 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
12770 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
12771 during 4.6.0 experimental. */
12774 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
12776 if (!cu->checked_producer)
12777 check_producer (cu);
12779 return cu->producer_is_gxx_lt_4_6;
12782 /* Return the default accessibility type if it is not overriden by
12783 DW_AT_accessibility. */
12785 static enum dwarf_access_attribute
12786 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
12788 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
12790 /* The default DWARF 2 accessibility for members is public, the default
12791 accessibility for inheritance is private. */
12793 if (die->tag != DW_TAG_inheritance)
12794 return DW_ACCESS_public;
12796 return DW_ACCESS_private;
12800 /* DWARF 3+ defines the default accessibility a different way. The same
12801 rules apply now for DW_TAG_inheritance as for the members and it only
12802 depends on the container kind. */
12804 if (die->parent->tag == DW_TAG_class_type)
12805 return DW_ACCESS_private;
12807 return DW_ACCESS_public;
12811 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
12812 offset. If the attribute was not found return 0, otherwise return
12813 1. If it was found but could not properly be handled, set *OFFSET
12817 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
12820 struct attribute *attr;
12822 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
12827 /* Note that we do not check for a section offset first here.
12828 This is because DW_AT_data_member_location is new in DWARF 4,
12829 so if we see it, we can assume that a constant form is really
12830 a constant and not a section offset. */
12831 if (attr_form_is_constant (attr))
12832 *offset = dwarf2_get_attr_constant_value (attr, 0);
12833 else if (attr_form_is_section_offset (attr))
12834 dwarf2_complex_location_expr_complaint ();
12835 else if (attr_form_is_block (attr))
12836 *offset = decode_locdesc (DW_BLOCK (attr), cu);
12838 dwarf2_complex_location_expr_complaint ();
12846 /* Add an aggregate field to the field list. */
12849 dwarf2_add_field (struct field_info *fip, struct die_info *die,
12850 struct dwarf2_cu *cu)
12852 struct objfile *objfile = cu->objfile;
12853 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12854 struct nextfield *new_field;
12855 struct attribute *attr;
12857 const char *fieldname = "";
12859 /* Allocate a new field list entry and link it in. */
12860 new_field = XNEW (struct nextfield);
12861 make_cleanup (xfree, new_field);
12862 memset (new_field, 0, sizeof (struct nextfield));
12864 if (die->tag == DW_TAG_inheritance)
12866 new_field->next = fip->baseclasses;
12867 fip->baseclasses = new_field;
12871 new_field->next = fip->fields;
12872 fip->fields = new_field;
12876 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
12878 new_field->accessibility = DW_UNSND (attr);
12880 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
12881 if (new_field->accessibility != DW_ACCESS_public)
12882 fip->non_public_fields = 1;
12884 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
12886 new_field->virtuality = DW_UNSND (attr);
12888 new_field->virtuality = DW_VIRTUALITY_none;
12890 fp = &new_field->field;
12892 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
12896 /* Data member other than a C++ static data member. */
12898 /* Get type of field. */
12899 fp->type = die_type (die, cu);
12901 SET_FIELD_BITPOS (*fp, 0);
12903 /* Get bit size of field (zero if none). */
12904 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
12907 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
12911 FIELD_BITSIZE (*fp) = 0;
12914 /* Get bit offset of field. */
12915 if (handle_data_member_location (die, cu, &offset))
12916 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
12917 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
12920 if (gdbarch_bits_big_endian (gdbarch))
12922 /* For big endian bits, the DW_AT_bit_offset gives the
12923 additional bit offset from the MSB of the containing
12924 anonymous object to the MSB of the field. We don't
12925 have to do anything special since we don't need to
12926 know the size of the anonymous object. */
12927 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
12931 /* For little endian bits, compute the bit offset to the
12932 MSB of the anonymous object, subtract off the number of
12933 bits from the MSB of the field to the MSB of the
12934 object, and then subtract off the number of bits of
12935 the field itself. The result is the bit offset of
12936 the LSB of the field. */
12937 int anonymous_size;
12938 int bit_offset = DW_UNSND (attr);
12940 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12943 /* The size of the anonymous object containing
12944 the bit field is explicit, so use the
12945 indicated size (in bytes). */
12946 anonymous_size = DW_UNSND (attr);
12950 /* The size of the anonymous object containing
12951 the bit field must be inferred from the type
12952 attribute of the data member containing the
12954 anonymous_size = TYPE_LENGTH (fp->type);
12956 SET_FIELD_BITPOS (*fp,
12957 (FIELD_BITPOS (*fp)
12958 + anonymous_size * bits_per_byte
12959 - bit_offset - FIELD_BITSIZE (*fp)));
12962 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
12964 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
12965 + dwarf2_get_attr_constant_value (attr, 0)));
12967 /* Get name of field. */
12968 fieldname = dwarf2_name (die, cu);
12969 if (fieldname == NULL)
12972 /* The name is already allocated along with this objfile, so we don't
12973 need to duplicate it for the type. */
12974 fp->name = fieldname;
12976 /* Change accessibility for artificial fields (e.g. virtual table
12977 pointer or virtual base class pointer) to private. */
12978 if (dwarf2_attr (die, DW_AT_artificial, cu))
12980 FIELD_ARTIFICIAL (*fp) = 1;
12981 new_field->accessibility = DW_ACCESS_private;
12982 fip->non_public_fields = 1;
12985 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
12987 /* C++ static member. */
12989 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
12990 is a declaration, but all versions of G++ as of this writing
12991 (so through at least 3.2.1) incorrectly generate
12992 DW_TAG_variable tags. */
12994 const char *physname;
12996 /* Get name of field. */
12997 fieldname = dwarf2_name (die, cu);
12998 if (fieldname == NULL)
13001 attr = dwarf2_attr (die, DW_AT_const_value, cu);
13003 /* Only create a symbol if this is an external value.
13004 new_symbol checks this and puts the value in the global symbol
13005 table, which we want. If it is not external, new_symbol
13006 will try to put the value in cu->list_in_scope which is wrong. */
13007 && dwarf2_flag_true_p (die, DW_AT_external, cu))
13009 /* A static const member, not much different than an enum as far as
13010 we're concerned, except that we can support more types. */
13011 new_symbol (die, NULL, cu);
13014 /* Get physical name. */
13015 physname = dwarf2_physname (fieldname, die, cu);
13017 /* The name is already allocated along with this objfile, so we don't
13018 need to duplicate it for the type. */
13019 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
13020 FIELD_TYPE (*fp) = die_type (die, cu);
13021 FIELD_NAME (*fp) = fieldname;
13023 else if (die->tag == DW_TAG_inheritance)
13027 /* C++ base class field. */
13028 if (handle_data_member_location (die, cu, &offset))
13029 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
13030 FIELD_BITSIZE (*fp) = 0;
13031 FIELD_TYPE (*fp) = die_type (die, cu);
13032 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
13033 fip->nbaseclasses++;
13037 /* Add a typedef defined in the scope of the FIP's class. */
13040 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
13041 struct dwarf2_cu *cu)
13043 struct typedef_field_list *new_field;
13044 struct typedef_field *fp;
13046 /* Allocate a new field list entry and link it in. */
13047 new_field = XCNEW (struct typedef_field_list);
13048 make_cleanup (xfree, new_field);
13050 gdb_assert (die->tag == DW_TAG_typedef);
13052 fp = &new_field->field;
13054 /* Get name of field. */
13055 fp->name = dwarf2_name (die, cu);
13056 if (fp->name == NULL)
13059 fp->type = read_type_die (die, cu);
13061 new_field->next = fip->typedef_field_list;
13062 fip->typedef_field_list = new_field;
13063 fip->typedef_field_list_count++;
13066 /* Create the vector of fields, and attach it to the type. */
13069 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
13070 struct dwarf2_cu *cu)
13072 int nfields = fip->nfields;
13074 /* Record the field count, allocate space for the array of fields,
13075 and create blank accessibility bitfields if necessary. */
13076 TYPE_NFIELDS (type) = nfields;
13077 TYPE_FIELDS (type) = (struct field *)
13078 TYPE_ALLOC (type, sizeof (struct field) * nfields);
13079 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
13081 if (fip->non_public_fields && cu->language != language_ada)
13083 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13085 TYPE_FIELD_PRIVATE_BITS (type) =
13086 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13087 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
13089 TYPE_FIELD_PROTECTED_BITS (type) =
13090 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13091 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
13093 TYPE_FIELD_IGNORE_BITS (type) =
13094 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13095 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
13098 /* If the type has baseclasses, allocate and clear a bit vector for
13099 TYPE_FIELD_VIRTUAL_BITS. */
13100 if (fip->nbaseclasses && cu->language != language_ada)
13102 int num_bytes = B_BYTES (fip->nbaseclasses);
13103 unsigned char *pointer;
13105 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13106 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
13107 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
13108 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
13109 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
13112 /* Copy the saved-up fields into the field vector. Start from the head of
13113 the list, adding to the tail of the field array, so that they end up in
13114 the same order in the array in which they were added to the list. */
13115 while (nfields-- > 0)
13117 struct nextfield *fieldp;
13121 fieldp = fip->fields;
13122 fip->fields = fieldp->next;
13126 fieldp = fip->baseclasses;
13127 fip->baseclasses = fieldp->next;
13130 TYPE_FIELD (type, nfields) = fieldp->field;
13131 switch (fieldp->accessibility)
13133 case DW_ACCESS_private:
13134 if (cu->language != language_ada)
13135 SET_TYPE_FIELD_PRIVATE (type, nfields);
13138 case DW_ACCESS_protected:
13139 if (cu->language != language_ada)
13140 SET_TYPE_FIELD_PROTECTED (type, nfields);
13143 case DW_ACCESS_public:
13147 /* Unknown accessibility. Complain and treat it as public. */
13149 complaint (&symfile_complaints, _("unsupported accessibility %d"),
13150 fieldp->accessibility);
13154 if (nfields < fip->nbaseclasses)
13156 switch (fieldp->virtuality)
13158 case DW_VIRTUALITY_virtual:
13159 case DW_VIRTUALITY_pure_virtual:
13160 if (cu->language == language_ada)
13161 error (_("unexpected virtuality in component of Ada type"));
13162 SET_TYPE_FIELD_VIRTUAL (type, nfields);
13169 /* Return true if this member function is a constructor, false
13173 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
13175 const char *fieldname;
13176 const char *type_name;
13179 if (die->parent == NULL)
13182 if (die->parent->tag != DW_TAG_structure_type
13183 && die->parent->tag != DW_TAG_union_type
13184 && die->parent->tag != DW_TAG_class_type)
13187 fieldname = dwarf2_name (die, cu);
13188 type_name = dwarf2_name (die->parent, cu);
13189 if (fieldname == NULL || type_name == NULL)
13192 len = strlen (fieldname);
13193 return (strncmp (fieldname, type_name, len) == 0
13194 && (type_name[len] == '\0' || type_name[len] == '<'));
13197 /* Add a member function to the proper fieldlist. */
13200 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
13201 struct type *type, struct dwarf2_cu *cu)
13203 struct objfile *objfile = cu->objfile;
13204 struct attribute *attr;
13205 struct fnfieldlist *flp;
13207 struct fn_field *fnp;
13208 const char *fieldname;
13209 struct nextfnfield *new_fnfield;
13210 struct type *this_type;
13211 enum dwarf_access_attribute accessibility;
13213 if (cu->language == language_ada)
13214 error (_("unexpected member function in Ada type"));
13216 /* Get name of member function. */
13217 fieldname = dwarf2_name (die, cu);
13218 if (fieldname == NULL)
13221 /* Look up member function name in fieldlist. */
13222 for (i = 0; i < fip->nfnfields; i++)
13224 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
13228 /* Create new list element if necessary. */
13229 if (i < fip->nfnfields)
13230 flp = &fip->fnfieldlists[i];
13233 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
13235 fip->fnfieldlists = (struct fnfieldlist *)
13236 xrealloc (fip->fnfieldlists,
13237 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
13238 * sizeof (struct fnfieldlist));
13239 if (fip->nfnfields == 0)
13240 make_cleanup (free_current_contents, &fip->fnfieldlists);
13242 flp = &fip->fnfieldlists[fip->nfnfields];
13243 flp->name = fieldname;
13246 i = fip->nfnfields++;
13249 /* Create a new member function field and chain it to the field list
13251 new_fnfield = XNEW (struct nextfnfield);
13252 make_cleanup (xfree, new_fnfield);
13253 memset (new_fnfield, 0, sizeof (struct nextfnfield));
13254 new_fnfield->next = flp->head;
13255 flp->head = new_fnfield;
13258 /* Fill in the member function field info. */
13259 fnp = &new_fnfield->fnfield;
13261 /* Delay processing of the physname until later. */
13262 if (cu->language == language_cplus)
13264 add_to_method_list (type, i, flp->length - 1, fieldname,
13269 const char *physname = dwarf2_physname (fieldname, die, cu);
13270 fnp->physname = physname ? physname : "";
13273 fnp->type = alloc_type (objfile);
13274 this_type = read_type_die (die, cu);
13275 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
13277 int nparams = TYPE_NFIELDS (this_type);
13279 /* TYPE is the domain of this method, and THIS_TYPE is the type
13280 of the method itself (TYPE_CODE_METHOD). */
13281 smash_to_method_type (fnp->type, type,
13282 TYPE_TARGET_TYPE (this_type),
13283 TYPE_FIELDS (this_type),
13284 TYPE_NFIELDS (this_type),
13285 TYPE_VARARGS (this_type));
13287 /* Handle static member functions.
13288 Dwarf2 has no clean way to discern C++ static and non-static
13289 member functions. G++ helps GDB by marking the first
13290 parameter for non-static member functions (which is the this
13291 pointer) as artificial. We obtain this information from
13292 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
13293 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
13294 fnp->voffset = VOFFSET_STATIC;
13297 complaint (&symfile_complaints, _("member function type missing for '%s'"),
13298 dwarf2_full_name (fieldname, die, cu));
13300 /* Get fcontext from DW_AT_containing_type if present. */
13301 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13302 fnp->fcontext = die_containing_type (die, cu);
13304 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
13305 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
13307 /* Get accessibility. */
13308 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
13310 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
13312 accessibility = dwarf2_default_access_attribute (die, cu);
13313 switch (accessibility)
13315 case DW_ACCESS_private:
13316 fnp->is_private = 1;
13318 case DW_ACCESS_protected:
13319 fnp->is_protected = 1;
13323 /* Check for artificial methods. */
13324 attr = dwarf2_attr (die, DW_AT_artificial, cu);
13325 if (attr && DW_UNSND (attr) != 0)
13326 fnp->is_artificial = 1;
13328 fnp->is_constructor = dwarf2_is_constructor (die, cu);
13330 /* Get index in virtual function table if it is a virtual member
13331 function. For older versions of GCC, this is an offset in the
13332 appropriate virtual table, as specified by DW_AT_containing_type.
13333 For everyone else, it is an expression to be evaluated relative
13334 to the object address. */
13336 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
13339 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
13341 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
13343 /* Old-style GCC. */
13344 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
13346 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
13347 || (DW_BLOCK (attr)->size > 1
13348 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
13349 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
13351 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
13352 if ((fnp->voffset % cu->header.addr_size) != 0)
13353 dwarf2_complex_location_expr_complaint ();
13355 fnp->voffset /= cu->header.addr_size;
13359 dwarf2_complex_location_expr_complaint ();
13361 if (!fnp->fcontext)
13363 /* If there is no `this' field and no DW_AT_containing_type,
13364 we cannot actually find a base class context for the
13366 if (TYPE_NFIELDS (this_type) == 0
13367 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
13369 complaint (&symfile_complaints,
13370 _("cannot determine context for virtual member "
13371 "function \"%s\" (offset %d)"),
13372 fieldname, to_underlying (die->sect_off));
13377 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
13381 else if (attr_form_is_section_offset (attr))
13383 dwarf2_complex_location_expr_complaint ();
13387 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
13393 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
13394 if (attr && DW_UNSND (attr))
13396 /* GCC does this, as of 2008-08-25; PR debug/37237. */
13397 complaint (&symfile_complaints,
13398 _("Member function \"%s\" (offset %d) is virtual "
13399 "but the vtable offset is not specified"),
13400 fieldname, to_underlying (die->sect_off));
13401 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13402 TYPE_CPLUS_DYNAMIC (type) = 1;
13407 /* Create the vector of member function fields, and attach it to the type. */
13410 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
13411 struct dwarf2_cu *cu)
13413 struct fnfieldlist *flp;
13416 if (cu->language == language_ada)
13417 error (_("unexpected member functions in Ada type"));
13419 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13420 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
13421 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
13423 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
13425 struct nextfnfield *nfp = flp->head;
13426 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
13429 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
13430 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
13431 fn_flp->fn_fields = (struct fn_field *)
13432 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
13433 for (k = flp->length; (k--, nfp); nfp = nfp->next)
13434 fn_flp->fn_fields[k] = nfp->fnfield;
13437 TYPE_NFN_FIELDS (type) = fip->nfnfields;
13440 /* Returns non-zero if NAME is the name of a vtable member in CU's
13441 language, zero otherwise. */
13443 is_vtable_name (const char *name, struct dwarf2_cu *cu)
13445 static const char vptr[] = "_vptr";
13446 static const char vtable[] = "vtable";
13448 /* Look for the C++ form of the vtable. */
13449 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
13455 /* GCC outputs unnamed structures that are really pointers to member
13456 functions, with the ABI-specified layout. If TYPE describes
13457 such a structure, smash it into a member function type.
13459 GCC shouldn't do this; it should just output pointer to member DIEs.
13460 This is GCC PR debug/28767. */
13463 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
13465 struct type *pfn_type, *self_type, *new_type;
13467 /* Check for a structure with no name and two children. */
13468 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
13471 /* Check for __pfn and __delta members. */
13472 if (TYPE_FIELD_NAME (type, 0) == NULL
13473 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
13474 || TYPE_FIELD_NAME (type, 1) == NULL
13475 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
13478 /* Find the type of the method. */
13479 pfn_type = TYPE_FIELD_TYPE (type, 0);
13480 if (pfn_type == NULL
13481 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
13482 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
13485 /* Look for the "this" argument. */
13486 pfn_type = TYPE_TARGET_TYPE (pfn_type);
13487 if (TYPE_NFIELDS (pfn_type) == 0
13488 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
13489 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
13492 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
13493 new_type = alloc_type (objfile);
13494 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
13495 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
13496 TYPE_VARARGS (pfn_type));
13497 smash_to_methodptr_type (type, new_type);
13500 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
13504 producer_is_icc (struct dwarf2_cu *cu)
13506 if (!cu->checked_producer)
13507 check_producer (cu);
13509 return cu->producer_is_icc;
13512 /* Called when we find the DIE that starts a structure or union scope
13513 (definition) to create a type for the structure or union. Fill in
13514 the type's name and general properties; the members will not be
13515 processed until process_structure_scope. A symbol table entry for
13516 the type will also not be done until process_structure_scope (assuming
13517 the type has a name).
13519 NOTE: we need to call these functions regardless of whether or not the
13520 DIE has a DW_AT_name attribute, since it might be an anonymous
13521 structure or union. This gets the type entered into our set of
13522 user defined types. */
13524 static struct type *
13525 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
13527 struct objfile *objfile = cu->objfile;
13529 struct attribute *attr;
13532 /* If the definition of this type lives in .debug_types, read that type.
13533 Don't follow DW_AT_specification though, that will take us back up
13534 the chain and we want to go down. */
13535 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13538 type = get_DW_AT_signature_type (die, attr, cu);
13540 /* The type's CU may not be the same as CU.
13541 Ensure TYPE is recorded with CU in die_type_hash. */
13542 return set_die_type (die, type, cu);
13545 type = alloc_type (objfile);
13546 INIT_CPLUS_SPECIFIC (type);
13548 name = dwarf2_name (die, cu);
13551 if (cu->language == language_cplus
13552 || cu->language == language_d
13553 || cu->language == language_rust)
13555 const char *full_name = dwarf2_full_name (name, die, cu);
13557 /* dwarf2_full_name might have already finished building the DIE's
13558 type. If so, there is no need to continue. */
13559 if (get_die_type (die, cu) != NULL)
13560 return get_die_type (die, cu);
13562 TYPE_TAG_NAME (type) = full_name;
13563 if (die->tag == DW_TAG_structure_type
13564 || die->tag == DW_TAG_class_type)
13565 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13569 /* The name is already allocated along with this objfile, so
13570 we don't need to duplicate it for the type. */
13571 TYPE_TAG_NAME (type) = name;
13572 if (die->tag == DW_TAG_class_type)
13573 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13577 if (die->tag == DW_TAG_structure_type)
13579 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13581 else if (die->tag == DW_TAG_union_type)
13583 TYPE_CODE (type) = TYPE_CODE_UNION;
13587 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13590 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
13591 TYPE_DECLARED_CLASS (type) = 1;
13593 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13596 if (attr_form_is_constant (attr))
13597 TYPE_LENGTH (type) = DW_UNSND (attr);
13600 /* For the moment, dynamic type sizes are not supported
13601 by GDB's struct type. The actual size is determined
13602 on-demand when resolving the type of a given object,
13603 so set the type's length to zero for now. Otherwise,
13604 we record an expression as the length, and that expression
13605 could lead to a very large value, which could eventually
13606 lead to us trying to allocate that much memory when creating
13607 a value of that type. */
13608 TYPE_LENGTH (type) = 0;
13613 TYPE_LENGTH (type) = 0;
13616 if (producer_is_icc (cu) && (TYPE_LENGTH (type) == 0))
13618 /* ICC does not output the required DW_AT_declaration
13619 on incomplete types, but gives them a size of zero. */
13620 TYPE_STUB (type) = 1;
13623 TYPE_STUB_SUPPORTED (type) = 1;
13625 if (die_is_declaration (die, cu))
13626 TYPE_STUB (type) = 1;
13627 else if (attr == NULL && die->child == NULL
13628 && producer_is_realview (cu->producer))
13629 /* RealView does not output the required DW_AT_declaration
13630 on incomplete types. */
13631 TYPE_STUB (type) = 1;
13633 /* We need to add the type field to the die immediately so we don't
13634 infinitely recurse when dealing with pointers to the structure
13635 type within the structure itself. */
13636 set_die_type (die, type, cu);
13638 /* set_die_type should be already done. */
13639 set_descriptive_type (type, die, cu);
13644 /* Finish creating a structure or union type, including filling in
13645 its members and creating a symbol for it. */
13648 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
13650 struct objfile *objfile = cu->objfile;
13651 struct die_info *child_die;
13654 type = get_die_type (die, cu);
13656 type = read_structure_type (die, cu);
13658 if (die->child != NULL && ! die_is_declaration (die, cu))
13660 struct field_info fi;
13661 VEC (symbolp) *template_args = NULL;
13662 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
13664 memset (&fi, 0, sizeof (struct field_info));
13666 child_die = die->child;
13668 while (child_die && child_die->tag)
13670 if (child_die->tag == DW_TAG_member
13671 || child_die->tag == DW_TAG_variable)
13673 /* NOTE: carlton/2002-11-05: A C++ static data member
13674 should be a DW_TAG_member that is a declaration, but
13675 all versions of G++ as of this writing (so through at
13676 least 3.2.1) incorrectly generate DW_TAG_variable
13677 tags for them instead. */
13678 dwarf2_add_field (&fi, child_die, cu);
13680 else if (child_die->tag == DW_TAG_subprogram)
13682 /* Rust doesn't have member functions in the C++ sense.
13683 However, it does emit ordinary functions as children
13684 of a struct DIE. */
13685 if (cu->language == language_rust)
13686 read_func_scope (child_die, cu);
13689 /* C++ member function. */
13690 dwarf2_add_member_fn (&fi, child_die, type, cu);
13693 else if (child_die->tag == DW_TAG_inheritance)
13695 /* C++ base class field. */
13696 dwarf2_add_field (&fi, child_die, cu);
13698 else if (child_die->tag == DW_TAG_typedef)
13699 dwarf2_add_typedef (&fi, child_die, cu);
13700 else if (child_die->tag == DW_TAG_template_type_param
13701 || child_die->tag == DW_TAG_template_value_param)
13703 struct symbol *arg = new_symbol (child_die, NULL, cu);
13706 VEC_safe_push (symbolp, template_args, arg);
13709 child_die = sibling_die (child_die);
13712 /* Attach template arguments to type. */
13713 if (! VEC_empty (symbolp, template_args))
13715 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13716 TYPE_N_TEMPLATE_ARGUMENTS (type)
13717 = VEC_length (symbolp, template_args);
13718 TYPE_TEMPLATE_ARGUMENTS (type)
13719 = XOBNEWVEC (&objfile->objfile_obstack,
13721 TYPE_N_TEMPLATE_ARGUMENTS (type));
13722 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
13723 VEC_address (symbolp, template_args),
13724 (TYPE_N_TEMPLATE_ARGUMENTS (type)
13725 * sizeof (struct symbol *)));
13726 VEC_free (symbolp, template_args);
13729 /* Attach fields and member functions to the type. */
13731 dwarf2_attach_fields_to_type (&fi, type, cu);
13734 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
13736 /* Get the type which refers to the base class (possibly this
13737 class itself) which contains the vtable pointer for the current
13738 class from the DW_AT_containing_type attribute. This use of
13739 DW_AT_containing_type is a GNU extension. */
13741 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13743 struct type *t = die_containing_type (die, cu);
13745 set_type_vptr_basetype (type, t);
13750 /* Our own class provides vtbl ptr. */
13751 for (i = TYPE_NFIELDS (t) - 1;
13752 i >= TYPE_N_BASECLASSES (t);
13755 const char *fieldname = TYPE_FIELD_NAME (t, i);
13757 if (is_vtable_name (fieldname, cu))
13759 set_type_vptr_fieldno (type, i);
13764 /* Complain if virtual function table field not found. */
13765 if (i < TYPE_N_BASECLASSES (t))
13766 complaint (&symfile_complaints,
13767 _("virtual function table pointer "
13768 "not found when defining class '%s'"),
13769 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
13774 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
13777 else if (cu->producer
13778 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
13780 /* The IBM XLC compiler does not provide direct indication
13781 of the containing type, but the vtable pointer is
13782 always named __vfp. */
13786 for (i = TYPE_NFIELDS (type) - 1;
13787 i >= TYPE_N_BASECLASSES (type);
13790 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
13792 set_type_vptr_fieldno (type, i);
13793 set_type_vptr_basetype (type, type);
13800 /* Copy fi.typedef_field_list linked list elements content into the
13801 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
13802 if (fi.typedef_field_list)
13804 int i = fi.typedef_field_list_count;
13806 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13807 TYPE_TYPEDEF_FIELD_ARRAY (type)
13808 = ((struct typedef_field *)
13809 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
13810 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
13812 /* Reverse the list order to keep the debug info elements order. */
13815 struct typedef_field *dest, *src;
13817 dest = &TYPE_TYPEDEF_FIELD (type, i);
13818 src = &fi.typedef_field_list->field;
13819 fi.typedef_field_list = fi.typedef_field_list->next;
13824 do_cleanups (back_to);
13827 quirk_gcc_member_function_pointer (type, objfile);
13829 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
13830 snapshots) has been known to create a die giving a declaration
13831 for a class that has, as a child, a die giving a definition for a
13832 nested class. So we have to process our children even if the
13833 current die is a declaration. Normally, of course, a declaration
13834 won't have any children at all. */
13836 child_die = die->child;
13838 while (child_die != NULL && child_die->tag)
13840 if (child_die->tag == DW_TAG_member
13841 || child_die->tag == DW_TAG_variable
13842 || child_die->tag == DW_TAG_inheritance
13843 || child_die->tag == DW_TAG_template_value_param
13844 || child_die->tag == DW_TAG_template_type_param)
13849 process_die (child_die, cu);
13851 child_die = sibling_die (child_die);
13854 /* Do not consider external references. According to the DWARF standard,
13855 these DIEs are identified by the fact that they have no byte_size
13856 attribute, and a declaration attribute. */
13857 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
13858 || !die_is_declaration (die, cu))
13859 new_symbol (die, type, cu);
13862 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
13863 update TYPE using some information only available in DIE's children. */
13866 update_enumeration_type_from_children (struct die_info *die,
13868 struct dwarf2_cu *cu)
13870 struct die_info *child_die;
13871 int unsigned_enum = 1;
13875 auto_obstack obstack;
13877 for (child_die = die->child;
13878 child_die != NULL && child_die->tag;
13879 child_die = sibling_die (child_die))
13881 struct attribute *attr;
13883 const gdb_byte *bytes;
13884 struct dwarf2_locexpr_baton *baton;
13887 if (child_die->tag != DW_TAG_enumerator)
13890 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
13894 name = dwarf2_name (child_die, cu);
13896 name = "<anonymous enumerator>";
13898 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
13899 &value, &bytes, &baton);
13905 else if ((mask & value) != 0)
13910 /* If we already know that the enum type is neither unsigned, nor
13911 a flag type, no need to look at the rest of the enumerates. */
13912 if (!unsigned_enum && !flag_enum)
13917 TYPE_UNSIGNED (type) = 1;
13919 TYPE_FLAG_ENUM (type) = 1;
13922 /* Given a DW_AT_enumeration_type die, set its type. We do not
13923 complete the type's fields yet, or create any symbols. */
13925 static struct type *
13926 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
13928 struct objfile *objfile = cu->objfile;
13930 struct attribute *attr;
13933 /* If the definition of this type lives in .debug_types, read that type.
13934 Don't follow DW_AT_specification though, that will take us back up
13935 the chain and we want to go down. */
13936 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13939 type = get_DW_AT_signature_type (die, attr, cu);
13941 /* The type's CU may not be the same as CU.
13942 Ensure TYPE is recorded with CU in die_type_hash. */
13943 return set_die_type (die, type, cu);
13946 type = alloc_type (objfile);
13948 TYPE_CODE (type) = TYPE_CODE_ENUM;
13949 name = dwarf2_full_name (NULL, die, cu);
13951 TYPE_TAG_NAME (type) = name;
13953 attr = dwarf2_attr (die, DW_AT_type, cu);
13956 struct type *underlying_type = die_type (die, cu);
13958 TYPE_TARGET_TYPE (type) = underlying_type;
13961 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13964 TYPE_LENGTH (type) = DW_UNSND (attr);
13968 TYPE_LENGTH (type) = 0;
13971 /* The enumeration DIE can be incomplete. In Ada, any type can be
13972 declared as private in the package spec, and then defined only
13973 inside the package body. Such types are known as Taft Amendment
13974 Types. When another package uses such a type, an incomplete DIE
13975 may be generated by the compiler. */
13976 if (die_is_declaration (die, cu))
13977 TYPE_STUB (type) = 1;
13979 /* Finish the creation of this type by using the enum's children.
13980 We must call this even when the underlying type has been provided
13981 so that we can determine if we're looking at a "flag" enum. */
13982 update_enumeration_type_from_children (die, type, cu);
13984 /* If this type has an underlying type that is not a stub, then we
13985 may use its attributes. We always use the "unsigned" attribute
13986 in this situation, because ordinarily we guess whether the type
13987 is unsigned -- but the guess can be wrong and the underlying type
13988 can tell us the reality. However, we defer to a local size
13989 attribute if one exists, because this lets the compiler override
13990 the underlying type if needed. */
13991 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
13993 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
13994 if (TYPE_LENGTH (type) == 0)
13995 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
13998 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
14000 return set_die_type (die, type, cu);
14003 /* Given a pointer to a die which begins an enumeration, process all
14004 the dies that define the members of the enumeration, and create the
14005 symbol for the enumeration type.
14007 NOTE: We reverse the order of the element list. */
14010 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
14012 struct type *this_type;
14014 this_type = get_die_type (die, cu);
14015 if (this_type == NULL)
14016 this_type = read_enumeration_type (die, cu);
14018 if (die->child != NULL)
14020 struct die_info *child_die;
14021 struct symbol *sym;
14022 struct field *fields = NULL;
14023 int num_fields = 0;
14026 child_die = die->child;
14027 while (child_die && child_die->tag)
14029 if (child_die->tag != DW_TAG_enumerator)
14031 process_die (child_die, cu);
14035 name = dwarf2_name (child_die, cu);
14038 sym = new_symbol (child_die, this_type, cu);
14040 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
14042 fields = (struct field *)
14044 (num_fields + DW_FIELD_ALLOC_CHUNK)
14045 * sizeof (struct field));
14048 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
14049 FIELD_TYPE (fields[num_fields]) = NULL;
14050 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
14051 FIELD_BITSIZE (fields[num_fields]) = 0;
14057 child_die = sibling_die (child_die);
14062 TYPE_NFIELDS (this_type) = num_fields;
14063 TYPE_FIELDS (this_type) = (struct field *)
14064 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
14065 memcpy (TYPE_FIELDS (this_type), fields,
14066 sizeof (struct field) * num_fields);
14071 /* If we are reading an enum from a .debug_types unit, and the enum
14072 is a declaration, and the enum is not the signatured type in the
14073 unit, then we do not want to add a symbol for it. Adding a
14074 symbol would in some cases obscure the true definition of the
14075 enum, giving users an incomplete type when the definition is
14076 actually available. Note that we do not want to do this for all
14077 enums which are just declarations, because C++0x allows forward
14078 enum declarations. */
14079 if (cu->per_cu->is_debug_types
14080 && die_is_declaration (die, cu))
14082 struct signatured_type *sig_type;
14084 sig_type = (struct signatured_type *) cu->per_cu;
14085 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
14086 if (sig_type->type_offset_in_section != die->sect_off)
14090 new_symbol (die, this_type, cu);
14093 /* Extract all information from a DW_TAG_array_type DIE and put it in
14094 the DIE's type field. For now, this only handles one dimensional
14097 static struct type *
14098 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
14100 struct objfile *objfile = cu->objfile;
14101 struct die_info *child_die;
14103 struct type *element_type, *range_type, *index_type;
14104 struct type **range_types = NULL;
14105 struct attribute *attr;
14107 struct cleanup *back_to;
14109 unsigned int bit_stride = 0;
14111 element_type = die_type (die, cu);
14113 /* The die_type call above may have already set the type for this DIE. */
14114 type = get_die_type (die, cu);
14118 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
14120 bit_stride = DW_UNSND (attr) * 8;
14122 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
14124 bit_stride = DW_UNSND (attr);
14126 /* Irix 6.2 native cc creates array types without children for
14127 arrays with unspecified length. */
14128 if (die->child == NULL)
14130 index_type = objfile_type (objfile)->builtin_int;
14131 range_type = create_static_range_type (NULL, index_type, 0, -1);
14132 type = create_array_type_with_stride (NULL, element_type, range_type,
14134 return set_die_type (die, type, cu);
14137 back_to = make_cleanup (null_cleanup, NULL);
14138 child_die = die->child;
14139 while (child_die && child_die->tag)
14141 if (child_die->tag == DW_TAG_subrange_type)
14143 struct type *child_type = read_type_die (child_die, cu);
14145 if (child_type != NULL)
14147 /* The range type was succesfully read. Save it for the
14148 array type creation. */
14149 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
14151 range_types = (struct type **)
14152 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
14153 * sizeof (struct type *));
14155 make_cleanup (free_current_contents, &range_types);
14157 range_types[ndim++] = child_type;
14160 child_die = sibling_die (child_die);
14163 /* Dwarf2 dimensions are output from left to right, create the
14164 necessary array types in backwards order. */
14166 type = element_type;
14168 if (read_array_order (die, cu) == DW_ORD_col_major)
14173 type = create_array_type_with_stride (NULL, type, range_types[i++],
14179 type = create_array_type_with_stride (NULL, type, range_types[ndim],
14183 /* Understand Dwarf2 support for vector types (like they occur on
14184 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
14185 array type. This is not part of the Dwarf2/3 standard yet, but a
14186 custom vendor extension. The main difference between a regular
14187 array and the vector variant is that vectors are passed by value
14189 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
14191 make_vector_type (type);
14193 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
14194 implementation may choose to implement triple vectors using this
14196 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14199 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
14200 TYPE_LENGTH (type) = DW_UNSND (attr);
14202 complaint (&symfile_complaints,
14203 _("DW_AT_byte_size for array type smaller "
14204 "than the total size of elements"));
14207 name = dwarf2_name (die, cu);
14209 TYPE_NAME (type) = name;
14211 /* Install the type in the die. */
14212 set_die_type (die, type, cu);
14214 /* set_die_type should be already done. */
14215 set_descriptive_type (type, die, cu);
14217 do_cleanups (back_to);
14222 static enum dwarf_array_dim_ordering
14223 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
14225 struct attribute *attr;
14227 attr = dwarf2_attr (die, DW_AT_ordering, cu);
14230 return (enum dwarf_array_dim_ordering) DW_SND (attr);
14232 /* GNU F77 is a special case, as at 08/2004 array type info is the
14233 opposite order to the dwarf2 specification, but data is still
14234 laid out as per normal fortran.
14236 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
14237 version checking. */
14239 if (cu->language == language_fortran
14240 && cu->producer && strstr (cu->producer, "GNU F77"))
14242 return DW_ORD_row_major;
14245 switch (cu->language_defn->la_array_ordering)
14247 case array_column_major:
14248 return DW_ORD_col_major;
14249 case array_row_major:
14251 return DW_ORD_row_major;
14255 /* Extract all information from a DW_TAG_set_type DIE and put it in
14256 the DIE's type field. */
14258 static struct type *
14259 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
14261 struct type *domain_type, *set_type;
14262 struct attribute *attr;
14264 domain_type = die_type (die, cu);
14266 /* The die_type call above may have already set the type for this DIE. */
14267 set_type = get_die_type (die, cu);
14271 set_type = create_set_type (NULL, domain_type);
14273 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14275 TYPE_LENGTH (set_type) = DW_UNSND (attr);
14277 return set_die_type (die, set_type, cu);
14280 /* A helper for read_common_block that creates a locexpr baton.
14281 SYM is the symbol which we are marking as computed.
14282 COMMON_DIE is the DIE for the common block.
14283 COMMON_LOC is the location expression attribute for the common
14285 MEMBER_LOC is the location expression attribute for the particular
14286 member of the common block that we are processing.
14287 CU is the CU from which the above come. */
14290 mark_common_block_symbol_computed (struct symbol *sym,
14291 struct die_info *common_die,
14292 struct attribute *common_loc,
14293 struct attribute *member_loc,
14294 struct dwarf2_cu *cu)
14296 struct objfile *objfile = dwarf2_per_objfile->objfile;
14297 struct dwarf2_locexpr_baton *baton;
14299 unsigned int cu_off;
14300 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
14301 LONGEST offset = 0;
14303 gdb_assert (common_loc && member_loc);
14304 gdb_assert (attr_form_is_block (common_loc));
14305 gdb_assert (attr_form_is_block (member_loc)
14306 || attr_form_is_constant (member_loc));
14308 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14309 baton->per_cu = cu->per_cu;
14310 gdb_assert (baton->per_cu);
14312 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
14314 if (attr_form_is_constant (member_loc))
14316 offset = dwarf2_get_attr_constant_value (member_loc, 0);
14317 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
14320 baton->size += DW_BLOCK (member_loc)->size;
14322 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
14325 *ptr++ = DW_OP_call4;
14326 cu_off = common_die->sect_off - cu->per_cu->sect_off;
14327 store_unsigned_integer (ptr, 4, byte_order, cu_off);
14330 if (attr_form_is_constant (member_loc))
14332 *ptr++ = DW_OP_addr;
14333 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
14334 ptr += cu->header.addr_size;
14338 /* We have to copy the data here, because DW_OP_call4 will only
14339 use a DW_AT_location attribute. */
14340 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
14341 ptr += DW_BLOCK (member_loc)->size;
14344 *ptr++ = DW_OP_plus;
14345 gdb_assert (ptr - baton->data == baton->size);
14347 SYMBOL_LOCATION_BATON (sym) = baton;
14348 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
14351 /* Create appropriate locally-scoped variables for all the
14352 DW_TAG_common_block entries. Also create a struct common_block
14353 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
14354 is used to sepate the common blocks name namespace from regular
14358 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
14360 struct attribute *attr;
14362 attr = dwarf2_attr (die, DW_AT_location, cu);
14365 /* Support the .debug_loc offsets. */
14366 if (attr_form_is_block (attr))
14370 else if (attr_form_is_section_offset (attr))
14372 dwarf2_complex_location_expr_complaint ();
14377 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14378 "common block member");
14383 if (die->child != NULL)
14385 struct objfile *objfile = cu->objfile;
14386 struct die_info *child_die;
14387 size_t n_entries = 0, size;
14388 struct common_block *common_block;
14389 struct symbol *sym;
14391 for (child_die = die->child;
14392 child_die && child_die->tag;
14393 child_die = sibling_die (child_die))
14396 size = (sizeof (struct common_block)
14397 + (n_entries - 1) * sizeof (struct symbol *));
14399 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
14401 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
14402 common_block->n_entries = 0;
14404 for (child_die = die->child;
14405 child_die && child_die->tag;
14406 child_die = sibling_die (child_die))
14408 /* Create the symbol in the DW_TAG_common_block block in the current
14410 sym = new_symbol (child_die, NULL, cu);
14413 struct attribute *member_loc;
14415 common_block->contents[common_block->n_entries++] = sym;
14417 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
14421 /* GDB has handled this for a long time, but it is
14422 not specified by DWARF. It seems to have been
14423 emitted by gfortran at least as recently as:
14424 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
14425 complaint (&symfile_complaints,
14426 _("Variable in common block has "
14427 "DW_AT_data_member_location "
14428 "- DIE at 0x%x [in module %s]"),
14429 to_underlying (child_die->sect_off),
14430 objfile_name (cu->objfile));
14432 if (attr_form_is_section_offset (member_loc))
14433 dwarf2_complex_location_expr_complaint ();
14434 else if (attr_form_is_constant (member_loc)
14435 || attr_form_is_block (member_loc))
14438 mark_common_block_symbol_computed (sym, die, attr,
14442 dwarf2_complex_location_expr_complaint ();
14447 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
14448 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
14452 /* Create a type for a C++ namespace. */
14454 static struct type *
14455 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
14457 struct objfile *objfile = cu->objfile;
14458 const char *previous_prefix, *name;
14462 /* For extensions, reuse the type of the original namespace. */
14463 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
14465 struct die_info *ext_die;
14466 struct dwarf2_cu *ext_cu = cu;
14468 ext_die = dwarf2_extension (die, &ext_cu);
14469 type = read_type_die (ext_die, ext_cu);
14471 /* EXT_CU may not be the same as CU.
14472 Ensure TYPE is recorded with CU in die_type_hash. */
14473 return set_die_type (die, type, cu);
14476 name = namespace_name (die, &is_anonymous, cu);
14478 /* Now build the name of the current namespace. */
14480 previous_prefix = determine_prefix (die, cu);
14481 if (previous_prefix[0] != '\0')
14482 name = typename_concat (&objfile->objfile_obstack,
14483 previous_prefix, name, 0, cu);
14485 /* Create the type. */
14486 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
14487 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14489 return set_die_type (die, type, cu);
14492 /* Read a namespace scope. */
14495 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
14497 struct objfile *objfile = cu->objfile;
14500 /* Add a symbol associated to this if we haven't seen the namespace
14501 before. Also, add a using directive if it's an anonymous
14504 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
14508 type = read_type_die (die, cu);
14509 new_symbol (die, type, cu);
14511 namespace_name (die, &is_anonymous, cu);
14514 const char *previous_prefix = determine_prefix (die, cu);
14516 add_using_directive (using_directives (cu->language),
14517 previous_prefix, TYPE_NAME (type), NULL,
14518 NULL, NULL, 0, &objfile->objfile_obstack);
14522 if (die->child != NULL)
14524 struct die_info *child_die = die->child;
14526 while (child_die && child_die->tag)
14528 process_die (child_die, cu);
14529 child_die = sibling_die (child_die);
14534 /* Read a Fortran module as type. This DIE can be only a declaration used for
14535 imported module. Still we need that type as local Fortran "use ... only"
14536 declaration imports depend on the created type in determine_prefix. */
14538 static struct type *
14539 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
14541 struct objfile *objfile = cu->objfile;
14542 const char *module_name;
14545 module_name = dwarf2_name (die, cu);
14547 complaint (&symfile_complaints,
14548 _("DW_TAG_module has no name, offset 0x%x"),
14549 to_underlying (die->sect_off));
14550 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
14552 /* determine_prefix uses TYPE_TAG_NAME. */
14553 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14555 return set_die_type (die, type, cu);
14558 /* Read a Fortran module. */
14561 read_module (struct die_info *die, struct dwarf2_cu *cu)
14563 struct die_info *child_die = die->child;
14566 type = read_type_die (die, cu);
14567 new_symbol (die, type, cu);
14569 while (child_die && child_die->tag)
14571 process_die (child_die, cu);
14572 child_die = sibling_die (child_die);
14576 /* Return the name of the namespace represented by DIE. Set
14577 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
14580 static const char *
14581 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
14583 struct die_info *current_die;
14584 const char *name = NULL;
14586 /* Loop through the extensions until we find a name. */
14588 for (current_die = die;
14589 current_die != NULL;
14590 current_die = dwarf2_extension (die, &cu))
14592 /* We don't use dwarf2_name here so that we can detect the absence
14593 of a name -> anonymous namespace. */
14594 name = dwarf2_string_attr (die, DW_AT_name, cu);
14600 /* Is it an anonymous namespace? */
14602 *is_anonymous = (name == NULL);
14604 name = CP_ANONYMOUS_NAMESPACE_STR;
14609 /* Extract all information from a DW_TAG_pointer_type DIE and add to
14610 the user defined type vector. */
14612 static struct type *
14613 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
14615 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
14616 struct comp_unit_head *cu_header = &cu->header;
14618 struct attribute *attr_byte_size;
14619 struct attribute *attr_address_class;
14620 int byte_size, addr_class;
14621 struct type *target_type;
14623 target_type = die_type (die, cu);
14625 /* The die_type call above may have already set the type for this DIE. */
14626 type = get_die_type (die, cu);
14630 type = lookup_pointer_type (target_type);
14632 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
14633 if (attr_byte_size)
14634 byte_size = DW_UNSND (attr_byte_size);
14636 byte_size = cu_header->addr_size;
14638 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
14639 if (attr_address_class)
14640 addr_class = DW_UNSND (attr_address_class);
14642 addr_class = DW_ADDR_none;
14644 /* If the pointer size or address class is different than the
14645 default, create a type variant marked as such and set the
14646 length accordingly. */
14647 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
14649 if (gdbarch_address_class_type_flags_p (gdbarch))
14653 type_flags = gdbarch_address_class_type_flags
14654 (gdbarch, byte_size, addr_class);
14655 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
14657 type = make_type_with_address_space (type, type_flags);
14659 else if (TYPE_LENGTH (type) != byte_size)
14661 complaint (&symfile_complaints,
14662 _("invalid pointer size %d"), byte_size);
14666 /* Should we also complain about unhandled address classes? */
14670 TYPE_LENGTH (type) = byte_size;
14671 return set_die_type (die, type, cu);
14674 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
14675 the user defined type vector. */
14677 static struct type *
14678 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
14681 struct type *to_type;
14682 struct type *domain;
14684 to_type = die_type (die, cu);
14685 domain = die_containing_type (die, cu);
14687 /* The calls above may have already set the type for this DIE. */
14688 type = get_die_type (die, cu);
14692 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
14693 type = lookup_methodptr_type (to_type);
14694 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
14696 struct type *new_type = alloc_type (cu->objfile);
14698 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
14699 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
14700 TYPE_VARARGS (to_type));
14701 type = lookup_methodptr_type (new_type);
14704 type = lookup_memberptr_type (to_type, domain);
14706 return set_die_type (die, type, cu);
14709 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
14710 the user defined type vector. */
14712 static struct type *
14713 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
14714 enum type_code refcode)
14716 struct comp_unit_head *cu_header = &cu->header;
14717 struct type *type, *target_type;
14718 struct attribute *attr;
14720 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
14722 target_type = die_type (die, cu);
14724 /* The die_type call above may have already set the type for this DIE. */
14725 type = get_die_type (die, cu);
14729 type = lookup_reference_type (target_type, refcode);
14730 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14733 TYPE_LENGTH (type) = DW_UNSND (attr);
14737 TYPE_LENGTH (type) = cu_header->addr_size;
14739 return set_die_type (die, type, cu);
14742 /* Add the given cv-qualifiers to the element type of the array. GCC
14743 outputs DWARF type qualifiers that apply to an array, not the
14744 element type. But GDB relies on the array element type to carry
14745 the cv-qualifiers. This mimics section 6.7.3 of the C99
14748 static struct type *
14749 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
14750 struct type *base_type, int cnst, int voltl)
14752 struct type *el_type, *inner_array;
14754 base_type = copy_type (base_type);
14755 inner_array = base_type;
14757 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
14759 TYPE_TARGET_TYPE (inner_array) =
14760 copy_type (TYPE_TARGET_TYPE (inner_array));
14761 inner_array = TYPE_TARGET_TYPE (inner_array);
14764 el_type = TYPE_TARGET_TYPE (inner_array);
14765 cnst |= TYPE_CONST (el_type);
14766 voltl |= TYPE_VOLATILE (el_type);
14767 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
14769 return set_die_type (die, base_type, cu);
14772 static struct type *
14773 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
14775 struct type *base_type, *cv_type;
14777 base_type = die_type (die, cu);
14779 /* The die_type call above may have already set the type for this DIE. */
14780 cv_type = get_die_type (die, cu);
14784 /* In case the const qualifier is applied to an array type, the element type
14785 is so qualified, not the array type (section 6.7.3 of C99). */
14786 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14787 return add_array_cv_type (die, cu, base_type, 1, 0);
14789 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
14790 return set_die_type (die, cv_type, cu);
14793 static struct type *
14794 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
14796 struct type *base_type, *cv_type;
14798 base_type = die_type (die, cu);
14800 /* The die_type call above may have already set the type for this DIE. */
14801 cv_type = get_die_type (die, cu);
14805 /* In case the volatile qualifier is applied to an array type, the
14806 element type is so qualified, not the array type (section 6.7.3
14808 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14809 return add_array_cv_type (die, cu, base_type, 0, 1);
14811 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
14812 return set_die_type (die, cv_type, cu);
14815 /* Handle DW_TAG_restrict_type. */
14817 static struct type *
14818 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
14820 struct type *base_type, *cv_type;
14822 base_type = die_type (die, cu);
14824 /* The die_type call above may have already set the type for this DIE. */
14825 cv_type = get_die_type (die, cu);
14829 cv_type = make_restrict_type (base_type);
14830 return set_die_type (die, cv_type, cu);
14833 /* Handle DW_TAG_atomic_type. */
14835 static struct type *
14836 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
14838 struct type *base_type, *cv_type;
14840 base_type = die_type (die, cu);
14842 /* The die_type call above may have already set the type for this DIE. */
14843 cv_type = get_die_type (die, cu);
14847 cv_type = make_atomic_type (base_type);
14848 return set_die_type (die, cv_type, cu);
14851 /* Extract all information from a DW_TAG_string_type DIE and add to
14852 the user defined type vector. It isn't really a user defined type,
14853 but it behaves like one, with other DIE's using an AT_user_def_type
14854 attribute to reference it. */
14856 static struct type *
14857 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
14859 struct objfile *objfile = cu->objfile;
14860 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14861 struct type *type, *range_type, *index_type, *char_type;
14862 struct attribute *attr;
14863 unsigned int length;
14865 attr = dwarf2_attr (die, DW_AT_string_length, cu);
14868 length = DW_UNSND (attr);
14872 /* Check for the DW_AT_byte_size attribute. */
14873 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14876 length = DW_UNSND (attr);
14884 index_type = objfile_type (objfile)->builtin_int;
14885 range_type = create_static_range_type (NULL, index_type, 1, length);
14886 char_type = language_string_char_type (cu->language_defn, gdbarch);
14887 type = create_string_type (NULL, char_type, range_type);
14889 return set_die_type (die, type, cu);
14892 /* Assuming that DIE corresponds to a function, returns nonzero
14893 if the function is prototyped. */
14896 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
14898 struct attribute *attr;
14900 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
14901 if (attr && (DW_UNSND (attr) != 0))
14904 /* The DWARF standard implies that the DW_AT_prototyped attribute
14905 is only meaninful for C, but the concept also extends to other
14906 languages that allow unprototyped functions (Eg: Objective C).
14907 For all other languages, assume that functions are always
14909 if (cu->language != language_c
14910 && cu->language != language_objc
14911 && cu->language != language_opencl)
14914 /* RealView does not emit DW_AT_prototyped. We can not distinguish
14915 prototyped and unprototyped functions; default to prototyped,
14916 since that is more common in modern code (and RealView warns
14917 about unprototyped functions). */
14918 if (producer_is_realview (cu->producer))
14924 /* Handle DIES due to C code like:
14928 int (*funcp)(int a, long l);
14932 ('funcp' generates a DW_TAG_subroutine_type DIE). */
14934 static struct type *
14935 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
14937 struct objfile *objfile = cu->objfile;
14938 struct type *type; /* Type that this function returns. */
14939 struct type *ftype; /* Function that returns above type. */
14940 struct attribute *attr;
14942 type = die_type (die, cu);
14944 /* The die_type call above may have already set the type for this DIE. */
14945 ftype = get_die_type (die, cu);
14949 ftype = lookup_function_type (type);
14951 if (prototyped_function_p (die, cu))
14952 TYPE_PROTOTYPED (ftype) = 1;
14954 /* Store the calling convention in the type if it's available in
14955 the subroutine die. Otherwise set the calling convention to
14956 the default value DW_CC_normal. */
14957 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
14959 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
14960 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
14961 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
14963 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
14965 /* Record whether the function returns normally to its caller or not
14966 if the DWARF producer set that information. */
14967 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
14968 if (attr && (DW_UNSND (attr) != 0))
14969 TYPE_NO_RETURN (ftype) = 1;
14971 /* We need to add the subroutine type to the die immediately so
14972 we don't infinitely recurse when dealing with parameters
14973 declared as the same subroutine type. */
14974 set_die_type (die, ftype, cu);
14976 if (die->child != NULL)
14978 struct type *void_type = objfile_type (objfile)->builtin_void;
14979 struct die_info *child_die;
14980 int nparams, iparams;
14982 /* Count the number of parameters.
14983 FIXME: GDB currently ignores vararg functions, but knows about
14984 vararg member functions. */
14986 child_die = die->child;
14987 while (child_die && child_die->tag)
14989 if (child_die->tag == DW_TAG_formal_parameter)
14991 else if (child_die->tag == DW_TAG_unspecified_parameters)
14992 TYPE_VARARGS (ftype) = 1;
14993 child_die = sibling_die (child_die);
14996 /* Allocate storage for parameters and fill them in. */
14997 TYPE_NFIELDS (ftype) = nparams;
14998 TYPE_FIELDS (ftype) = (struct field *)
14999 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
15001 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
15002 even if we error out during the parameters reading below. */
15003 for (iparams = 0; iparams < nparams; iparams++)
15004 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
15007 child_die = die->child;
15008 while (child_die && child_die->tag)
15010 if (child_die->tag == DW_TAG_formal_parameter)
15012 struct type *arg_type;
15014 /* DWARF version 2 has no clean way to discern C++
15015 static and non-static member functions. G++ helps
15016 GDB by marking the first parameter for non-static
15017 member functions (which is the this pointer) as
15018 artificial. We pass this information to
15019 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
15021 DWARF version 3 added DW_AT_object_pointer, which GCC
15022 4.5 does not yet generate. */
15023 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
15025 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
15027 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
15028 arg_type = die_type (child_die, cu);
15030 /* RealView does not mark THIS as const, which the testsuite
15031 expects. GCC marks THIS as const in method definitions,
15032 but not in the class specifications (GCC PR 43053). */
15033 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
15034 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
15037 struct dwarf2_cu *arg_cu = cu;
15038 const char *name = dwarf2_name (child_die, cu);
15040 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
15043 /* If the compiler emits this, use it. */
15044 if (follow_die_ref (die, attr, &arg_cu) == child_die)
15047 else if (name && strcmp (name, "this") == 0)
15048 /* Function definitions will have the argument names. */
15050 else if (name == NULL && iparams == 0)
15051 /* Declarations may not have the names, so like
15052 elsewhere in GDB, assume an artificial first
15053 argument is "this". */
15057 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
15061 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
15064 child_die = sibling_die (child_die);
15071 static struct type *
15072 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
15074 struct objfile *objfile = cu->objfile;
15075 const char *name = NULL;
15076 struct type *this_type, *target_type;
15078 name = dwarf2_full_name (NULL, die, cu);
15079 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
15080 TYPE_TARGET_STUB (this_type) = 1;
15081 set_die_type (die, this_type, cu);
15082 target_type = die_type (die, cu);
15083 if (target_type != this_type)
15084 TYPE_TARGET_TYPE (this_type) = target_type;
15087 /* Self-referential typedefs are, it seems, not allowed by the DWARF
15088 spec and cause infinite loops in GDB. */
15089 complaint (&symfile_complaints,
15090 _("Self-referential DW_TAG_typedef "
15091 "- DIE at 0x%x [in module %s]"),
15092 to_underlying (die->sect_off), objfile_name (objfile));
15093 TYPE_TARGET_TYPE (this_type) = NULL;
15098 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
15099 (which may be different from NAME) to the architecture back-end to allow
15100 it to guess the correct format if necessary. */
15102 static struct type *
15103 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
15104 const char *name_hint)
15106 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15107 const struct floatformat **format;
15110 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
15112 type = init_float_type (objfile, bits, name, format);
15114 type = init_type (objfile, TYPE_CODE_ERROR, bits / TARGET_CHAR_BIT, name);
15119 /* Find a representation of a given base type and install
15120 it in the TYPE field of the die. */
15122 static struct type *
15123 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
15125 struct objfile *objfile = cu->objfile;
15127 struct attribute *attr;
15128 int encoding = 0, bits = 0;
15131 attr = dwarf2_attr (die, DW_AT_encoding, cu);
15134 encoding = DW_UNSND (attr);
15136 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15139 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
15141 name = dwarf2_name (die, cu);
15144 complaint (&symfile_complaints,
15145 _("DW_AT_name missing from DW_TAG_base_type"));
15150 case DW_ATE_address:
15151 /* Turn DW_ATE_address into a void * pointer. */
15152 type = init_type (objfile, TYPE_CODE_VOID, 1, NULL);
15153 type = init_pointer_type (objfile, bits, name, type);
15155 case DW_ATE_boolean:
15156 type = init_boolean_type (objfile, bits, 1, name);
15158 case DW_ATE_complex_float:
15159 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
15160 type = init_complex_type (objfile, name, type);
15162 case DW_ATE_decimal_float:
15163 type = init_decfloat_type (objfile, bits, name);
15166 type = dwarf2_init_float_type (objfile, bits, name, name);
15168 case DW_ATE_signed:
15169 type = init_integer_type (objfile, bits, 0, name);
15171 case DW_ATE_unsigned:
15172 if (cu->language == language_fortran
15174 && startswith (name, "character("))
15175 type = init_character_type (objfile, bits, 1, name);
15177 type = init_integer_type (objfile, bits, 1, name);
15179 case DW_ATE_signed_char:
15180 if (cu->language == language_ada || cu->language == language_m2
15181 || cu->language == language_pascal
15182 || cu->language == language_fortran)
15183 type = init_character_type (objfile, bits, 0, name);
15185 type = init_integer_type (objfile, bits, 0, name);
15187 case DW_ATE_unsigned_char:
15188 if (cu->language == language_ada || cu->language == language_m2
15189 || cu->language == language_pascal
15190 || cu->language == language_fortran
15191 || cu->language == language_rust)
15192 type = init_character_type (objfile, bits, 1, name);
15194 type = init_integer_type (objfile, bits, 1, name);
15198 gdbarch *arch = get_objfile_arch (objfile);
15201 type = builtin_type (arch)->builtin_char16;
15202 else if (bits == 32)
15203 type = builtin_type (arch)->builtin_char32;
15206 complaint (&symfile_complaints,
15207 _("unsupported DW_ATE_UTF bit size: '%d'"),
15209 type = init_integer_type (objfile, bits, 1, name);
15211 return set_die_type (die, type, cu);
15216 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
15217 dwarf_type_encoding_name (encoding));
15218 type = init_type (objfile, TYPE_CODE_ERROR,
15219 bits / TARGET_CHAR_BIT, name);
15223 if (name && strcmp (name, "char") == 0)
15224 TYPE_NOSIGN (type) = 1;
15226 return set_die_type (die, type, cu);
15229 /* Parse dwarf attribute if it's a block, reference or constant and put the
15230 resulting value of the attribute into struct bound_prop.
15231 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
15234 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
15235 struct dwarf2_cu *cu, struct dynamic_prop *prop)
15237 struct dwarf2_property_baton *baton;
15238 struct obstack *obstack = &cu->objfile->objfile_obstack;
15240 if (attr == NULL || prop == NULL)
15243 if (attr_form_is_block (attr))
15245 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15246 baton->referenced_type = NULL;
15247 baton->locexpr.per_cu = cu->per_cu;
15248 baton->locexpr.size = DW_BLOCK (attr)->size;
15249 baton->locexpr.data = DW_BLOCK (attr)->data;
15250 prop->data.baton = baton;
15251 prop->kind = PROP_LOCEXPR;
15252 gdb_assert (prop->data.baton != NULL);
15254 else if (attr_form_is_ref (attr))
15256 struct dwarf2_cu *target_cu = cu;
15257 struct die_info *target_die;
15258 struct attribute *target_attr;
15260 target_die = follow_die_ref (die, attr, &target_cu);
15261 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
15262 if (target_attr == NULL)
15263 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
15265 if (target_attr == NULL)
15268 switch (target_attr->name)
15270 case DW_AT_location:
15271 if (attr_form_is_section_offset (target_attr))
15273 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15274 baton->referenced_type = die_type (target_die, target_cu);
15275 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
15276 prop->data.baton = baton;
15277 prop->kind = PROP_LOCLIST;
15278 gdb_assert (prop->data.baton != NULL);
15280 else if (attr_form_is_block (target_attr))
15282 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15283 baton->referenced_type = die_type (target_die, target_cu);
15284 baton->locexpr.per_cu = cu->per_cu;
15285 baton->locexpr.size = DW_BLOCK (target_attr)->size;
15286 baton->locexpr.data = DW_BLOCK (target_attr)->data;
15287 prop->data.baton = baton;
15288 prop->kind = PROP_LOCEXPR;
15289 gdb_assert (prop->data.baton != NULL);
15293 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15294 "dynamic property");
15298 case DW_AT_data_member_location:
15302 if (!handle_data_member_location (target_die, target_cu,
15306 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15307 baton->referenced_type = read_type_die (target_die->parent,
15309 baton->offset_info.offset = offset;
15310 baton->offset_info.type = die_type (target_die, target_cu);
15311 prop->data.baton = baton;
15312 prop->kind = PROP_ADDR_OFFSET;
15317 else if (attr_form_is_constant (attr))
15319 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
15320 prop->kind = PROP_CONST;
15324 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
15325 dwarf2_name (die, cu));
15332 /* Read the given DW_AT_subrange DIE. */
15334 static struct type *
15335 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
15337 struct type *base_type, *orig_base_type;
15338 struct type *range_type;
15339 struct attribute *attr;
15340 struct dynamic_prop low, high;
15341 int low_default_is_valid;
15342 int high_bound_is_count = 0;
15344 LONGEST negative_mask;
15346 orig_base_type = die_type (die, cu);
15347 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
15348 whereas the real type might be. So, we use ORIG_BASE_TYPE when
15349 creating the range type, but we use the result of check_typedef
15350 when examining properties of the type. */
15351 base_type = check_typedef (orig_base_type);
15353 /* The die_type call above may have already set the type for this DIE. */
15354 range_type = get_die_type (die, cu);
15358 low.kind = PROP_CONST;
15359 high.kind = PROP_CONST;
15360 high.data.const_val = 0;
15362 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
15363 omitting DW_AT_lower_bound. */
15364 switch (cu->language)
15367 case language_cplus:
15368 low.data.const_val = 0;
15369 low_default_is_valid = 1;
15371 case language_fortran:
15372 low.data.const_val = 1;
15373 low_default_is_valid = 1;
15376 case language_objc:
15377 case language_rust:
15378 low.data.const_val = 0;
15379 low_default_is_valid = (cu->header.version >= 4);
15383 case language_pascal:
15384 low.data.const_val = 1;
15385 low_default_is_valid = (cu->header.version >= 4);
15388 low.data.const_val = 0;
15389 low_default_is_valid = 0;
15393 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
15395 attr_to_dynamic_prop (attr, die, cu, &low);
15396 else if (!low_default_is_valid)
15397 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
15398 "- DIE at 0x%x [in module %s]"),
15399 to_underlying (die->sect_off), objfile_name (cu->objfile));
15401 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
15402 if (!attr_to_dynamic_prop (attr, die, cu, &high))
15404 attr = dwarf2_attr (die, DW_AT_count, cu);
15405 if (attr_to_dynamic_prop (attr, die, cu, &high))
15407 /* If bounds are constant do the final calculation here. */
15408 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
15409 high.data.const_val = low.data.const_val + high.data.const_val - 1;
15411 high_bound_is_count = 1;
15415 /* Dwarf-2 specifications explicitly allows to create subrange types
15416 without specifying a base type.
15417 In that case, the base type must be set to the type of
15418 the lower bound, upper bound or count, in that order, if any of these
15419 three attributes references an object that has a type.
15420 If no base type is found, the Dwarf-2 specifications say that
15421 a signed integer type of size equal to the size of an address should
15423 For the following C code: `extern char gdb_int [];'
15424 GCC produces an empty range DIE.
15425 FIXME: muller/2010-05-28: Possible references to object for low bound,
15426 high bound or count are not yet handled by this code. */
15427 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
15429 struct objfile *objfile = cu->objfile;
15430 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15431 int addr_size = gdbarch_addr_bit (gdbarch) /8;
15432 struct type *int_type = objfile_type (objfile)->builtin_int;
15434 /* Test "int", "long int", and "long long int" objfile types,
15435 and select the first one having a size above or equal to the
15436 architecture address size. */
15437 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15438 base_type = int_type;
15441 int_type = objfile_type (objfile)->builtin_long;
15442 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15443 base_type = int_type;
15446 int_type = objfile_type (objfile)->builtin_long_long;
15447 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15448 base_type = int_type;
15453 /* Normally, the DWARF producers are expected to use a signed
15454 constant form (Eg. DW_FORM_sdata) to express negative bounds.
15455 But this is unfortunately not always the case, as witnessed
15456 with GCC, for instance, where the ambiguous DW_FORM_dataN form
15457 is used instead. To work around that ambiguity, we treat
15458 the bounds as signed, and thus sign-extend their values, when
15459 the base type is signed. */
15461 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
15462 if (low.kind == PROP_CONST
15463 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
15464 low.data.const_val |= negative_mask;
15465 if (high.kind == PROP_CONST
15466 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
15467 high.data.const_val |= negative_mask;
15469 range_type = create_range_type (NULL, orig_base_type, &low, &high);
15471 if (high_bound_is_count)
15472 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
15474 /* Ada expects an empty array on no boundary attributes. */
15475 if (attr == NULL && cu->language != language_ada)
15476 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
15478 name = dwarf2_name (die, cu);
15480 TYPE_NAME (range_type) = name;
15482 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15484 TYPE_LENGTH (range_type) = DW_UNSND (attr);
15486 set_die_type (die, range_type, cu);
15488 /* set_die_type should be already done. */
15489 set_descriptive_type (range_type, die, cu);
15494 static struct type *
15495 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
15499 /* For now, we only support the C meaning of an unspecified type: void. */
15501 type = init_type (cu->objfile, TYPE_CODE_VOID, 0, NULL);
15502 TYPE_NAME (type) = dwarf2_name (die, cu);
15504 return set_die_type (die, type, cu);
15507 /* Read a single die and all its descendents. Set the die's sibling
15508 field to NULL; set other fields in the die correctly, and set all
15509 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
15510 location of the info_ptr after reading all of those dies. PARENT
15511 is the parent of the die in question. */
15513 static struct die_info *
15514 read_die_and_children (const struct die_reader_specs *reader,
15515 const gdb_byte *info_ptr,
15516 const gdb_byte **new_info_ptr,
15517 struct die_info *parent)
15519 struct die_info *die;
15520 const gdb_byte *cur_ptr;
15523 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
15526 *new_info_ptr = cur_ptr;
15529 store_in_ref_table (die, reader->cu);
15532 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
15536 *new_info_ptr = cur_ptr;
15539 die->sibling = NULL;
15540 die->parent = parent;
15544 /* Read a die, all of its descendents, and all of its siblings; set
15545 all of the fields of all of the dies correctly. Arguments are as
15546 in read_die_and_children. */
15548 static struct die_info *
15549 read_die_and_siblings_1 (const struct die_reader_specs *reader,
15550 const gdb_byte *info_ptr,
15551 const gdb_byte **new_info_ptr,
15552 struct die_info *parent)
15554 struct die_info *first_die, *last_sibling;
15555 const gdb_byte *cur_ptr;
15557 cur_ptr = info_ptr;
15558 first_die = last_sibling = NULL;
15562 struct die_info *die
15563 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
15567 *new_info_ptr = cur_ptr;
15574 last_sibling->sibling = die;
15576 last_sibling = die;
15580 /* Read a die, all of its descendents, and all of its siblings; set
15581 all of the fields of all of the dies correctly. Arguments are as
15582 in read_die_and_children.
15583 This the main entry point for reading a DIE and all its children. */
15585 static struct die_info *
15586 read_die_and_siblings (const struct die_reader_specs *reader,
15587 const gdb_byte *info_ptr,
15588 const gdb_byte **new_info_ptr,
15589 struct die_info *parent)
15591 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
15592 new_info_ptr, parent);
15594 if (dwarf_die_debug)
15596 fprintf_unfiltered (gdb_stdlog,
15597 "Read die from %s@0x%x of %s:\n",
15598 get_section_name (reader->die_section),
15599 (unsigned) (info_ptr - reader->die_section->buffer),
15600 bfd_get_filename (reader->abfd));
15601 dump_die (die, dwarf_die_debug);
15607 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
15609 The caller is responsible for filling in the extra attributes
15610 and updating (*DIEP)->num_attrs.
15611 Set DIEP to point to a newly allocated die with its information,
15612 except for its child, sibling, and parent fields.
15613 Set HAS_CHILDREN to tell whether the die has children or not. */
15615 static const gdb_byte *
15616 read_full_die_1 (const struct die_reader_specs *reader,
15617 struct die_info **diep, const gdb_byte *info_ptr,
15618 int *has_children, int num_extra_attrs)
15620 unsigned int abbrev_number, bytes_read, i;
15621 struct abbrev_info *abbrev;
15622 struct die_info *die;
15623 struct dwarf2_cu *cu = reader->cu;
15624 bfd *abfd = reader->abfd;
15626 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
15627 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15628 info_ptr += bytes_read;
15629 if (!abbrev_number)
15636 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
15638 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
15640 bfd_get_filename (abfd));
15642 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
15643 die->sect_off = sect_off;
15644 die->tag = abbrev->tag;
15645 die->abbrev = abbrev_number;
15647 /* Make the result usable.
15648 The caller needs to update num_attrs after adding the extra
15650 die->num_attrs = abbrev->num_attrs;
15652 for (i = 0; i < abbrev->num_attrs; ++i)
15653 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
15657 *has_children = abbrev->has_children;
15661 /* Read a die and all its attributes.
15662 Set DIEP to point to a newly allocated die with its information,
15663 except for its child, sibling, and parent fields.
15664 Set HAS_CHILDREN to tell whether the die has children or not. */
15666 static const gdb_byte *
15667 read_full_die (const struct die_reader_specs *reader,
15668 struct die_info **diep, const gdb_byte *info_ptr,
15671 const gdb_byte *result;
15673 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
15675 if (dwarf_die_debug)
15677 fprintf_unfiltered (gdb_stdlog,
15678 "Read die from %s@0x%x of %s:\n",
15679 get_section_name (reader->die_section),
15680 (unsigned) (info_ptr - reader->die_section->buffer),
15681 bfd_get_filename (reader->abfd));
15682 dump_die (*diep, dwarf_die_debug);
15688 /* Abbreviation tables.
15690 In DWARF version 2, the description of the debugging information is
15691 stored in a separate .debug_abbrev section. Before we read any
15692 dies from a section we read in all abbreviations and install them
15693 in a hash table. */
15695 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
15697 static struct abbrev_info *
15698 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
15700 struct abbrev_info *abbrev;
15702 abbrev = XOBNEW (&abbrev_table->abbrev_obstack, struct abbrev_info);
15703 memset (abbrev, 0, sizeof (struct abbrev_info));
15708 /* Add an abbreviation to the table. */
15711 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
15712 unsigned int abbrev_number,
15713 struct abbrev_info *abbrev)
15715 unsigned int hash_number;
15717 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15718 abbrev->next = abbrev_table->abbrevs[hash_number];
15719 abbrev_table->abbrevs[hash_number] = abbrev;
15722 /* Look up an abbrev in the table.
15723 Returns NULL if the abbrev is not found. */
15725 static struct abbrev_info *
15726 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
15727 unsigned int abbrev_number)
15729 unsigned int hash_number;
15730 struct abbrev_info *abbrev;
15732 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15733 abbrev = abbrev_table->abbrevs[hash_number];
15737 if (abbrev->number == abbrev_number)
15739 abbrev = abbrev->next;
15744 /* Read in an abbrev table. */
15746 static struct abbrev_table *
15747 abbrev_table_read_table (struct dwarf2_section_info *section,
15748 sect_offset sect_off)
15750 struct objfile *objfile = dwarf2_per_objfile->objfile;
15751 bfd *abfd = get_section_bfd_owner (section);
15752 struct abbrev_table *abbrev_table;
15753 const gdb_byte *abbrev_ptr;
15754 struct abbrev_info *cur_abbrev;
15755 unsigned int abbrev_number, bytes_read, abbrev_name;
15756 unsigned int abbrev_form;
15757 struct attr_abbrev *cur_attrs;
15758 unsigned int allocated_attrs;
15760 abbrev_table = XNEW (struct abbrev_table);
15761 abbrev_table->sect_off = sect_off;
15762 obstack_init (&abbrev_table->abbrev_obstack);
15763 abbrev_table->abbrevs =
15764 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct abbrev_info *,
15766 memset (abbrev_table->abbrevs, 0,
15767 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
15769 dwarf2_read_section (objfile, section);
15770 abbrev_ptr = section->buffer + to_underlying (sect_off);
15771 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15772 abbrev_ptr += bytes_read;
15774 allocated_attrs = ATTR_ALLOC_CHUNK;
15775 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
15777 /* Loop until we reach an abbrev number of 0. */
15778 while (abbrev_number)
15780 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
15782 /* read in abbrev header */
15783 cur_abbrev->number = abbrev_number;
15785 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15786 abbrev_ptr += bytes_read;
15787 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
15790 /* now read in declarations */
15793 LONGEST implicit_const;
15795 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15796 abbrev_ptr += bytes_read;
15797 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15798 abbrev_ptr += bytes_read;
15799 if (abbrev_form == DW_FORM_implicit_const)
15801 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
15803 abbrev_ptr += bytes_read;
15807 /* Initialize it due to a false compiler warning. */
15808 implicit_const = -1;
15811 if (abbrev_name == 0)
15814 if (cur_abbrev->num_attrs == allocated_attrs)
15816 allocated_attrs += ATTR_ALLOC_CHUNK;
15818 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
15821 cur_attrs[cur_abbrev->num_attrs].name
15822 = (enum dwarf_attribute) abbrev_name;
15823 cur_attrs[cur_abbrev->num_attrs].form
15824 = (enum dwarf_form) abbrev_form;
15825 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
15826 ++cur_abbrev->num_attrs;
15829 cur_abbrev->attrs =
15830 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
15831 cur_abbrev->num_attrs);
15832 memcpy (cur_abbrev->attrs, cur_attrs,
15833 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
15835 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
15837 /* Get next abbreviation.
15838 Under Irix6 the abbreviations for a compilation unit are not
15839 always properly terminated with an abbrev number of 0.
15840 Exit loop if we encounter an abbreviation which we have
15841 already read (which means we are about to read the abbreviations
15842 for the next compile unit) or if the end of the abbreviation
15843 table is reached. */
15844 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
15846 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15847 abbrev_ptr += bytes_read;
15848 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
15853 return abbrev_table;
15856 /* Free the resources held by ABBREV_TABLE. */
15859 abbrev_table_free (struct abbrev_table *abbrev_table)
15861 obstack_free (&abbrev_table->abbrev_obstack, NULL);
15862 xfree (abbrev_table);
15865 /* Same as abbrev_table_free but as a cleanup.
15866 We pass in a pointer to the pointer to the table so that we can
15867 set the pointer to NULL when we're done. It also simplifies
15868 build_type_psymtabs_1. */
15871 abbrev_table_free_cleanup (void *table_ptr)
15873 struct abbrev_table **abbrev_table_ptr = (struct abbrev_table **) table_ptr;
15875 if (*abbrev_table_ptr != NULL)
15876 abbrev_table_free (*abbrev_table_ptr);
15877 *abbrev_table_ptr = NULL;
15880 /* Read the abbrev table for CU from ABBREV_SECTION. */
15883 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
15884 struct dwarf2_section_info *abbrev_section)
15887 abbrev_table_read_table (abbrev_section, cu->header.abbrev_sect_off);
15890 /* Release the memory used by the abbrev table for a compilation unit. */
15893 dwarf2_free_abbrev_table (void *ptr_to_cu)
15895 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr_to_cu;
15897 if (cu->abbrev_table != NULL)
15898 abbrev_table_free (cu->abbrev_table);
15899 /* Set this to NULL so that we SEGV if we try to read it later,
15900 and also because free_comp_unit verifies this is NULL. */
15901 cu->abbrev_table = NULL;
15904 /* Returns nonzero if TAG represents a type that we might generate a partial
15908 is_type_tag_for_partial (int tag)
15913 /* Some types that would be reasonable to generate partial symbols for,
15914 that we don't at present. */
15915 case DW_TAG_array_type:
15916 case DW_TAG_file_type:
15917 case DW_TAG_ptr_to_member_type:
15918 case DW_TAG_set_type:
15919 case DW_TAG_string_type:
15920 case DW_TAG_subroutine_type:
15922 case DW_TAG_base_type:
15923 case DW_TAG_class_type:
15924 case DW_TAG_interface_type:
15925 case DW_TAG_enumeration_type:
15926 case DW_TAG_structure_type:
15927 case DW_TAG_subrange_type:
15928 case DW_TAG_typedef:
15929 case DW_TAG_union_type:
15936 /* Load all DIEs that are interesting for partial symbols into memory. */
15938 static struct partial_die_info *
15939 load_partial_dies (const struct die_reader_specs *reader,
15940 const gdb_byte *info_ptr, int building_psymtab)
15942 struct dwarf2_cu *cu = reader->cu;
15943 struct objfile *objfile = cu->objfile;
15944 struct partial_die_info *part_die;
15945 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
15946 struct abbrev_info *abbrev;
15947 unsigned int bytes_read;
15948 unsigned int load_all = 0;
15949 int nesting_level = 1;
15954 gdb_assert (cu->per_cu != NULL);
15955 if (cu->per_cu->load_all_dies)
15959 = htab_create_alloc_ex (cu->header.length / 12,
15963 &cu->comp_unit_obstack,
15964 hashtab_obstack_allocate,
15965 dummy_obstack_deallocate);
15967 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
15971 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
15973 /* A NULL abbrev means the end of a series of children. */
15974 if (abbrev == NULL)
15976 if (--nesting_level == 0)
15978 /* PART_DIE was probably the last thing allocated on the
15979 comp_unit_obstack, so we could call obstack_free
15980 here. We don't do that because the waste is small,
15981 and will be cleaned up when we're done with this
15982 compilation unit. This way, we're also more robust
15983 against other users of the comp_unit_obstack. */
15986 info_ptr += bytes_read;
15987 last_die = parent_die;
15988 parent_die = parent_die->die_parent;
15992 /* Check for template arguments. We never save these; if
15993 they're seen, we just mark the parent, and go on our way. */
15994 if (parent_die != NULL
15995 && cu->language == language_cplus
15996 && (abbrev->tag == DW_TAG_template_type_param
15997 || abbrev->tag == DW_TAG_template_value_param))
15999 parent_die->has_template_arguments = 1;
16003 /* We don't need a partial DIE for the template argument. */
16004 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16009 /* We only recurse into c++ subprograms looking for template arguments.
16010 Skip their other children. */
16012 && cu->language == language_cplus
16013 && parent_die != NULL
16014 && parent_die->tag == DW_TAG_subprogram)
16016 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16020 /* Check whether this DIE is interesting enough to save. Normally
16021 we would not be interested in members here, but there may be
16022 later variables referencing them via DW_AT_specification (for
16023 static members). */
16025 && !is_type_tag_for_partial (abbrev->tag)
16026 && abbrev->tag != DW_TAG_constant
16027 && abbrev->tag != DW_TAG_enumerator
16028 && abbrev->tag != DW_TAG_subprogram
16029 && abbrev->tag != DW_TAG_lexical_block
16030 && abbrev->tag != DW_TAG_variable
16031 && abbrev->tag != DW_TAG_namespace
16032 && abbrev->tag != DW_TAG_module
16033 && abbrev->tag != DW_TAG_member
16034 && abbrev->tag != DW_TAG_imported_unit
16035 && abbrev->tag != DW_TAG_imported_declaration)
16037 /* Otherwise we skip to the next sibling, if any. */
16038 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16042 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
16045 /* This two-pass algorithm for processing partial symbols has a
16046 high cost in cache pressure. Thus, handle some simple cases
16047 here which cover the majority of C partial symbols. DIEs
16048 which neither have specification tags in them, nor could have
16049 specification tags elsewhere pointing at them, can simply be
16050 processed and discarded.
16052 This segment is also optional; scan_partial_symbols and
16053 add_partial_symbol will handle these DIEs if we chain
16054 them in normally. When compilers which do not emit large
16055 quantities of duplicate debug information are more common,
16056 this code can probably be removed. */
16058 /* Any complete simple types at the top level (pretty much all
16059 of them, for a language without namespaces), can be processed
16061 if (parent_die == NULL
16062 && part_die->has_specification == 0
16063 && part_die->is_declaration == 0
16064 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
16065 || part_die->tag == DW_TAG_base_type
16066 || part_die->tag == DW_TAG_subrange_type))
16068 if (building_psymtab && part_die->name != NULL)
16069 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16070 VAR_DOMAIN, LOC_TYPEDEF,
16071 &objfile->static_psymbols,
16072 0, cu->language, objfile);
16073 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16077 /* The exception for DW_TAG_typedef with has_children above is
16078 a workaround of GCC PR debug/47510. In the case of this complaint
16079 type_name_no_tag_or_error will error on such types later.
16081 GDB skipped children of DW_TAG_typedef by the shortcut above and then
16082 it could not find the child DIEs referenced later, this is checked
16083 above. In correct DWARF DW_TAG_typedef should have no children. */
16085 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
16086 complaint (&symfile_complaints,
16087 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
16088 "- DIE at 0x%x [in module %s]"),
16089 to_underlying (part_die->sect_off), objfile_name (objfile));
16091 /* If we're at the second level, and we're an enumerator, and
16092 our parent has no specification (meaning possibly lives in a
16093 namespace elsewhere), then we can add the partial symbol now
16094 instead of queueing it. */
16095 if (part_die->tag == DW_TAG_enumerator
16096 && parent_die != NULL
16097 && parent_die->die_parent == NULL
16098 && parent_die->tag == DW_TAG_enumeration_type
16099 && parent_die->has_specification == 0)
16101 if (part_die->name == NULL)
16102 complaint (&symfile_complaints,
16103 _("malformed enumerator DIE ignored"));
16104 else if (building_psymtab)
16105 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16106 VAR_DOMAIN, LOC_CONST,
16107 cu->language == language_cplus
16108 ? &objfile->global_psymbols
16109 : &objfile->static_psymbols,
16110 0, cu->language, objfile);
16112 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16116 /* We'll save this DIE so link it in. */
16117 part_die->die_parent = parent_die;
16118 part_die->die_sibling = NULL;
16119 part_die->die_child = NULL;
16121 if (last_die && last_die == parent_die)
16122 last_die->die_child = part_die;
16124 last_die->die_sibling = part_die;
16126 last_die = part_die;
16128 if (first_die == NULL)
16129 first_die = part_die;
16131 /* Maybe add the DIE to the hash table. Not all DIEs that we
16132 find interesting need to be in the hash table, because we
16133 also have the parent/sibling/child chains; only those that we
16134 might refer to by offset later during partial symbol reading.
16136 For now this means things that might have be the target of a
16137 DW_AT_specification, DW_AT_abstract_origin, or
16138 DW_AT_extension. DW_AT_extension will refer only to
16139 namespaces; DW_AT_abstract_origin refers to functions (and
16140 many things under the function DIE, but we do not recurse
16141 into function DIEs during partial symbol reading) and
16142 possibly variables as well; DW_AT_specification refers to
16143 declarations. Declarations ought to have the DW_AT_declaration
16144 flag. It happens that GCC forgets to put it in sometimes, but
16145 only for functions, not for types.
16147 Adding more things than necessary to the hash table is harmless
16148 except for the performance cost. Adding too few will result in
16149 wasted time in find_partial_die, when we reread the compilation
16150 unit with load_all_dies set. */
16153 || abbrev->tag == DW_TAG_constant
16154 || abbrev->tag == DW_TAG_subprogram
16155 || abbrev->tag == DW_TAG_variable
16156 || abbrev->tag == DW_TAG_namespace
16157 || part_die->is_declaration)
16161 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
16162 to_underlying (part_die->sect_off),
16167 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
16169 /* For some DIEs we want to follow their children (if any). For C
16170 we have no reason to follow the children of structures; for other
16171 languages we have to, so that we can get at method physnames
16172 to infer fully qualified class names, for DW_AT_specification,
16173 and for C++ template arguments. For C++, we also look one level
16174 inside functions to find template arguments (if the name of the
16175 function does not already contain the template arguments).
16177 For Ada, we need to scan the children of subprograms and lexical
16178 blocks as well because Ada allows the definition of nested
16179 entities that could be interesting for the debugger, such as
16180 nested subprograms for instance. */
16181 if (last_die->has_children
16183 || last_die->tag == DW_TAG_namespace
16184 || last_die->tag == DW_TAG_module
16185 || last_die->tag == DW_TAG_enumeration_type
16186 || (cu->language == language_cplus
16187 && last_die->tag == DW_TAG_subprogram
16188 && (last_die->name == NULL
16189 || strchr (last_die->name, '<') == NULL))
16190 || (cu->language != language_c
16191 && (last_die->tag == DW_TAG_class_type
16192 || last_die->tag == DW_TAG_interface_type
16193 || last_die->tag == DW_TAG_structure_type
16194 || last_die->tag == DW_TAG_union_type))
16195 || (cu->language == language_ada
16196 && (last_die->tag == DW_TAG_subprogram
16197 || last_die->tag == DW_TAG_lexical_block))))
16200 parent_die = last_die;
16204 /* Otherwise we skip to the next sibling, if any. */
16205 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
16207 /* Back to the top, do it again. */
16211 /* Read a minimal amount of information into the minimal die structure. */
16213 static const gdb_byte *
16214 read_partial_die (const struct die_reader_specs *reader,
16215 struct partial_die_info *part_die,
16216 struct abbrev_info *abbrev, unsigned int abbrev_len,
16217 const gdb_byte *info_ptr)
16219 struct dwarf2_cu *cu = reader->cu;
16220 struct objfile *objfile = cu->objfile;
16221 const gdb_byte *buffer = reader->buffer;
16223 struct attribute attr;
16224 int has_low_pc_attr = 0;
16225 int has_high_pc_attr = 0;
16226 int high_pc_relative = 0;
16228 memset (part_die, 0, sizeof (struct partial_die_info));
16230 part_die->sect_off = (sect_offset) (info_ptr - buffer);
16232 info_ptr += abbrev_len;
16234 if (abbrev == NULL)
16237 part_die->tag = abbrev->tag;
16238 part_die->has_children = abbrev->has_children;
16240 for (i = 0; i < abbrev->num_attrs; ++i)
16242 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
16244 /* Store the data if it is of an attribute we want to keep in a
16245 partial symbol table. */
16249 switch (part_die->tag)
16251 case DW_TAG_compile_unit:
16252 case DW_TAG_partial_unit:
16253 case DW_TAG_type_unit:
16254 /* Compilation units have a DW_AT_name that is a filename, not
16255 a source language identifier. */
16256 case DW_TAG_enumeration_type:
16257 case DW_TAG_enumerator:
16258 /* These tags always have simple identifiers already; no need
16259 to canonicalize them. */
16260 part_die->name = DW_STRING (&attr);
16264 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
16265 &objfile->per_bfd->storage_obstack);
16269 case DW_AT_linkage_name:
16270 case DW_AT_MIPS_linkage_name:
16271 /* Note that both forms of linkage name might appear. We
16272 assume they will be the same, and we only store the last
16274 if (cu->language == language_ada)
16275 part_die->name = DW_STRING (&attr);
16276 part_die->linkage_name = DW_STRING (&attr);
16279 has_low_pc_attr = 1;
16280 part_die->lowpc = attr_value_as_address (&attr);
16282 case DW_AT_high_pc:
16283 has_high_pc_attr = 1;
16284 part_die->highpc = attr_value_as_address (&attr);
16285 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
16286 high_pc_relative = 1;
16288 case DW_AT_location:
16289 /* Support the .debug_loc offsets. */
16290 if (attr_form_is_block (&attr))
16292 part_die->d.locdesc = DW_BLOCK (&attr);
16294 else if (attr_form_is_section_offset (&attr))
16296 dwarf2_complex_location_expr_complaint ();
16300 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16301 "partial symbol information");
16304 case DW_AT_external:
16305 part_die->is_external = DW_UNSND (&attr);
16307 case DW_AT_declaration:
16308 part_die->is_declaration = DW_UNSND (&attr);
16311 part_die->has_type = 1;
16313 case DW_AT_abstract_origin:
16314 case DW_AT_specification:
16315 case DW_AT_extension:
16316 part_die->has_specification = 1;
16317 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
16318 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
16319 || cu->per_cu->is_dwz);
16321 case DW_AT_sibling:
16322 /* Ignore absolute siblings, they might point outside of
16323 the current compile unit. */
16324 if (attr.form == DW_FORM_ref_addr)
16325 complaint (&symfile_complaints,
16326 _("ignoring absolute DW_AT_sibling"));
16329 sect_offset off = dwarf2_get_ref_die_offset (&attr);
16330 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
16332 if (sibling_ptr < info_ptr)
16333 complaint (&symfile_complaints,
16334 _("DW_AT_sibling points backwards"));
16335 else if (sibling_ptr > reader->buffer_end)
16336 dwarf2_section_buffer_overflow_complaint (reader->die_section);
16338 part_die->sibling = sibling_ptr;
16341 case DW_AT_byte_size:
16342 part_die->has_byte_size = 1;
16344 case DW_AT_const_value:
16345 part_die->has_const_value = 1;
16347 case DW_AT_calling_convention:
16348 /* DWARF doesn't provide a way to identify a program's source-level
16349 entry point. DW_AT_calling_convention attributes are only meant
16350 to describe functions' calling conventions.
16352 However, because it's a necessary piece of information in
16353 Fortran, and before DWARF 4 DW_CC_program was the only
16354 piece of debugging information whose definition refers to
16355 a 'main program' at all, several compilers marked Fortran
16356 main programs with DW_CC_program --- even when those
16357 functions use the standard calling conventions.
16359 Although DWARF now specifies a way to provide this
16360 information, we support this practice for backward
16362 if (DW_UNSND (&attr) == DW_CC_program
16363 && cu->language == language_fortran)
16364 part_die->main_subprogram = 1;
16367 if (DW_UNSND (&attr) == DW_INL_inlined
16368 || DW_UNSND (&attr) == DW_INL_declared_inlined)
16369 part_die->may_be_inlined = 1;
16373 if (part_die->tag == DW_TAG_imported_unit)
16375 part_die->d.sect_off = dwarf2_get_ref_die_offset (&attr);
16376 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
16377 || cu->per_cu->is_dwz);
16381 case DW_AT_main_subprogram:
16382 part_die->main_subprogram = DW_UNSND (&attr);
16390 if (high_pc_relative)
16391 part_die->highpc += part_die->lowpc;
16393 if (has_low_pc_attr && has_high_pc_attr)
16395 /* When using the GNU linker, .gnu.linkonce. sections are used to
16396 eliminate duplicate copies of functions and vtables and such.
16397 The linker will arbitrarily choose one and discard the others.
16398 The AT_*_pc values for such functions refer to local labels in
16399 these sections. If the section from that file was discarded, the
16400 labels are not in the output, so the relocs get a value of 0.
16401 If this is a discarded function, mark the pc bounds as invalid,
16402 so that GDB will ignore it. */
16403 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
16405 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16407 complaint (&symfile_complaints,
16408 _("DW_AT_low_pc %s is zero "
16409 "for DIE at 0x%x [in module %s]"),
16410 paddress (gdbarch, part_die->lowpc),
16411 to_underlying (part_die->sect_off), objfile_name (objfile));
16413 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
16414 else if (part_die->lowpc >= part_die->highpc)
16416 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16418 complaint (&symfile_complaints,
16419 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
16420 "for DIE at 0x%x [in module %s]"),
16421 paddress (gdbarch, part_die->lowpc),
16422 paddress (gdbarch, part_die->highpc),
16423 to_underlying (part_die->sect_off),
16424 objfile_name (objfile));
16427 part_die->has_pc_info = 1;
16433 /* Find a cached partial DIE at OFFSET in CU. */
16435 static struct partial_die_info *
16436 find_partial_die_in_comp_unit (sect_offset sect_off, struct dwarf2_cu *cu)
16438 struct partial_die_info *lookup_die = NULL;
16439 struct partial_die_info part_die;
16441 part_die.sect_off = sect_off;
16442 lookup_die = ((struct partial_die_info *)
16443 htab_find_with_hash (cu->partial_dies, &part_die,
16444 to_underlying (sect_off)));
16449 /* Find a partial DIE at OFFSET, which may or may not be in CU,
16450 except in the case of .debug_types DIEs which do not reference
16451 outside their CU (they do however referencing other types via
16452 DW_FORM_ref_sig8). */
16454 static struct partial_die_info *
16455 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
16457 struct objfile *objfile = cu->objfile;
16458 struct dwarf2_per_cu_data *per_cu = NULL;
16459 struct partial_die_info *pd = NULL;
16461 if (offset_in_dwz == cu->per_cu->is_dwz
16462 && offset_in_cu_p (&cu->header, sect_off))
16464 pd = find_partial_die_in_comp_unit (sect_off, cu);
16467 /* We missed recording what we needed.
16468 Load all dies and try again. */
16469 per_cu = cu->per_cu;
16473 /* TUs don't reference other CUs/TUs (except via type signatures). */
16474 if (cu->per_cu->is_debug_types)
16476 error (_("Dwarf Error: Type Unit at offset 0x%x contains"
16477 " external reference to offset 0x%x [in module %s].\n"),
16478 to_underlying (cu->header.sect_off), to_underlying (sect_off),
16479 bfd_get_filename (objfile->obfd));
16481 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
16484 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
16485 load_partial_comp_unit (per_cu);
16487 per_cu->cu->last_used = 0;
16488 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
16491 /* If we didn't find it, and not all dies have been loaded,
16492 load them all and try again. */
16494 if (pd == NULL && per_cu->load_all_dies == 0)
16496 per_cu->load_all_dies = 1;
16498 /* This is nasty. When we reread the DIEs, somewhere up the call chain
16499 THIS_CU->cu may already be in use. So we can't just free it and
16500 replace its DIEs with the ones we read in. Instead, we leave those
16501 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
16502 and clobber THIS_CU->cu->partial_dies with the hash table for the new
16504 load_partial_comp_unit (per_cu);
16506 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
16510 internal_error (__FILE__, __LINE__,
16511 _("could not find partial DIE 0x%x "
16512 "in cache [from module %s]\n"),
16513 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
16517 /* See if we can figure out if the class lives in a namespace. We do
16518 this by looking for a member function; its demangled name will
16519 contain namespace info, if there is any. */
16522 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
16523 struct dwarf2_cu *cu)
16525 /* NOTE: carlton/2003-10-07: Getting the info this way changes
16526 what template types look like, because the demangler
16527 frequently doesn't give the same name as the debug info. We
16528 could fix this by only using the demangled name to get the
16529 prefix (but see comment in read_structure_type). */
16531 struct partial_die_info *real_pdi;
16532 struct partial_die_info *child_pdi;
16534 /* If this DIE (this DIE's specification, if any) has a parent, then
16535 we should not do this. We'll prepend the parent's fully qualified
16536 name when we create the partial symbol. */
16538 real_pdi = struct_pdi;
16539 while (real_pdi->has_specification)
16540 real_pdi = find_partial_die (real_pdi->spec_offset,
16541 real_pdi->spec_is_dwz, cu);
16543 if (real_pdi->die_parent != NULL)
16546 for (child_pdi = struct_pdi->die_child;
16548 child_pdi = child_pdi->die_sibling)
16550 if (child_pdi->tag == DW_TAG_subprogram
16551 && child_pdi->linkage_name != NULL)
16553 char *actual_class_name
16554 = language_class_name_from_physname (cu->language_defn,
16555 child_pdi->linkage_name);
16556 if (actual_class_name != NULL)
16560 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16562 strlen (actual_class_name)));
16563 xfree (actual_class_name);
16570 /* Adjust PART_DIE before generating a symbol for it. This function
16571 may set the is_external flag or change the DIE's name. */
16574 fixup_partial_die (struct partial_die_info *part_die,
16575 struct dwarf2_cu *cu)
16577 /* Once we've fixed up a die, there's no point in doing so again.
16578 This also avoids a memory leak if we were to call
16579 guess_partial_die_structure_name multiple times. */
16580 if (part_die->fixup_called)
16583 /* If we found a reference attribute and the DIE has no name, try
16584 to find a name in the referred to DIE. */
16586 if (part_die->name == NULL && part_die->has_specification)
16588 struct partial_die_info *spec_die;
16590 spec_die = find_partial_die (part_die->spec_offset,
16591 part_die->spec_is_dwz, cu);
16593 fixup_partial_die (spec_die, cu);
16595 if (spec_die->name)
16597 part_die->name = spec_die->name;
16599 /* Copy DW_AT_external attribute if it is set. */
16600 if (spec_die->is_external)
16601 part_die->is_external = spec_die->is_external;
16605 /* Set default names for some unnamed DIEs. */
16607 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
16608 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
16610 /* If there is no parent die to provide a namespace, and there are
16611 children, see if we can determine the namespace from their linkage
16613 if (cu->language == language_cplus
16614 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
16615 && part_die->die_parent == NULL
16616 && part_die->has_children
16617 && (part_die->tag == DW_TAG_class_type
16618 || part_die->tag == DW_TAG_structure_type
16619 || part_die->tag == DW_TAG_union_type))
16620 guess_partial_die_structure_name (part_die, cu);
16622 /* GCC might emit a nameless struct or union that has a linkage
16623 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
16624 if (part_die->name == NULL
16625 && (part_die->tag == DW_TAG_class_type
16626 || part_die->tag == DW_TAG_interface_type
16627 || part_die->tag == DW_TAG_structure_type
16628 || part_die->tag == DW_TAG_union_type)
16629 && part_die->linkage_name != NULL)
16633 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
16638 /* Strip any leading namespaces/classes, keep only the base name.
16639 DW_AT_name for named DIEs does not contain the prefixes. */
16640 base = strrchr (demangled, ':');
16641 if (base && base > demangled && base[-1] == ':')
16648 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16649 base, strlen (base)));
16654 part_die->fixup_called = 1;
16657 /* Read an attribute value described by an attribute form. */
16659 static const gdb_byte *
16660 read_attribute_value (const struct die_reader_specs *reader,
16661 struct attribute *attr, unsigned form,
16662 LONGEST implicit_const, const gdb_byte *info_ptr)
16664 struct dwarf2_cu *cu = reader->cu;
16665 struct objfile *objfile = cu->objfile;
16666 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16667 bfd *abfd = reader->abfd;
16668 struct comp_unit_head *cu_header = &cu->header;
16669 unsigned int bytes_read;
16670 struct dwarf_block *blk;
16672 attr->form = (enum dwarf_form) form;
16675 case DW_FORM_ref_addr:
16676 if (cu->header.version == 2)
16677 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16679 DW_UNSND (attr) = read_offset (abfd, info_ptr,
16680 &cu->header, &bytes_read);
16681 info_ptr += bytes_read;
16683 case DW_FORM_GNU_ref_alt:
16684 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16685 info_ptr += bytes_read;
16688 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16689 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
16690 info_ptr += bytes_read;
16692 case DW_FORM_block2:
16693 blk = dwarf_alloc_block (cu);
16694 blk->size = read_2_bytes (abfd, info_ptr);
16696 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16697 info_ptr += blk->size;
16698 DW_BLOCK (attr) = blk;
16700 case DW_FORM_block4:
16701 blk = dwarf_alloc_block (cu);
16702 blk->size = read_4_bytes (abfd, info_ptr);
16704 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16705 info_ptr += blk->size;
16706 DW_BLOCK (attr) = blk;
16708 case DW_FORM_data2:
16709 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
16712 case DW_FORM_data4:
16713 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
16716 case DW_FORM_data8:
16717 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
16720 case DW_FORM_data16:
16721 blk = dwarf_alloc_block (cu);
16723 blk->data = read_n_bytes (abfd, info_ptr, 16);
16725 DW_BLOCK (attr) = blk;
16727 case DW_FORM_sec_offset:
16728 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16729 info_ptr += bytes_read;
16731 case DW_FORM_string:
16732 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
16733 DW_STRING_IS_CANONICAL (attr) = 0;
16734 info_ptr += bytes_read;
16737 if (!cu->per_cu->is_dwz)
16739 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
16741 DW_STRING_IS_CANONICAL (attr) = 0;
16742 info_ptr += bytes_read;
16746 case DW_FORM_line_strp:
16747 if (!cu->per_cu->is_dwz)
16749 DW_STRING (attr) = read_indirect_line_string (abfd, info_ptr,
16750 cu_header, &bytes_read);
16751 DW_STRING_IS_CANONICAL (attr) = 0;
16752 info_ptr += bytes_read;
16756 case DW_FORM_GNU_strp_alt:
16758 struct dwz_file *dwz = dwarf2_get_dwz_file ();
16759 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
16762 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
16763 DW_STRING_IS_CANONICAL (attr) = 0;
16764 info_ptr += bytes_read;
16767 case DW_FORM_exprloc:
16768 case DW_FORM_block:
16769 blk = dwarf_alloc_block (cu);
16770 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16771 info_ptr += bytes_read;
16772 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16773 info_ptr += blk->size;
16774 DW_BLOCK (attr) = blk;
16776 case DW_FORM_block1:
16777 blk = dwarf_alloc_block (cu);
16778 blk->size = read_1_byte (abfd, info_ptr);
16780 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16781 info_ptr += blk->size;
16782 DW_BLOCK (attr) = blk;
16784 case DW_FORM_data1:
16785 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16789 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16792 case DW_FORM_flag_present:
16793 DW_UNSND (attr) = 1;
16795 case DW_FORM_sdata:
16796 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
16797 info_ptr += bytes_read;
16799 case DW_FORM_udata:
16800 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16801 info_ptr += bytes_read;
16804 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16805 + read_1_byte (abfd, info_ptr));
16809 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16810 + read_2_bytes (abfd, info_ptr));
16814 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16815 + read_4_bytes (abfd, info_ptr));
16819 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16820 + read_8_bytes (abfd, info_ptr));
16823 case DW_FORM_ref_sig8:
16824 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
16827 case DW_FORM_ref_udata:
16828 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16829 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
16830 info_ptr += bytes_read;
16832 case DW_FORM_indirect:
16833 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16834 info_ptr += bytes_read;
16835 if (form == DW_FORM_implicit_const)
16837 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
16838 info_ptr += bytes_read;
16840 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
16843 case DW_FORM_implicit_const:
16844 DW_SND (attr) = implicit_const;
16846 case DW_FORM_GNU_addr_index:
16847 if (reader->dwo_file == NULL)
16849 /* For now flag a hard error.
16850 Later we can turn this into a complaint. */
16851 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16852 dwarf_form_name (form),
16853 bfd_get_filename (abfd));
16855 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
16856 info_ptr += bytes_read;
16858 case DW_FORM_GNU_str_index:
16859 if (reader->dwo_file == NULL)
16861 /* For now flag a hard error.
16862 Later we can turn this into a complaint if warranted. */
16863 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16864 dwarf_form_name (form),
16865 bfd_get_filename (abfd));
16868 ULONGEST str_index =
16869 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16871 DW_STRING (attr) = read_str_index (reader, str_index);
16872 DW_STRING_IS_CANONICAL (attr) = 0;
16873 info_ptr += bytes_read;
16877 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
16878 dwarf_form_name (form),
16879 bfd_get_filename (abfd));
16883 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
16884 attr->form = DW_FORM_GNU_ref_alt;
16886 /* We have seen instances where the compiler tried to emit a byte
16887 size attribute of -1 which ended up being encoded as an unsigned
16888 0xffffffff. Although 0xffffffff is technically a valid size value,
16889 an object of this size seems pretty unlikely so we can relatively
16890 safely treat these cases as if the size attribute was invalid and
16891 treat them as zero by default. */
16892 if (attr->name == DW_AT_byte_size
16893 && form == DW_FORM_data4
16894 && DW_UNSND (attr) >= 0xffffffff)
16897 (&symfile_complaints,
16898 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
16899 hex_string (DW_UNSND (attr)));
16900 DW_UNSND (attr) = 0;
16906 /* Read an attribute described by an abbreviated attribute. */
16908 static const gdb_byte *
16909 read_attribute (const struct die_reader_specs *reader,
16910 struct attribute *attr, struct attr_abbrev *abbrev,
16911 const gdb_byte *info_ptr)
16913 attr->name = abbrev->name;
16914 return read_attribute_value (reader, attr, abbrev->form,
16915 abbrev->implicit_const, info_ptr);
16918 /* Read dwarf information from a buffer. */
16920 static unsigned int
16921 read_1_byte (bfd *abfd, const gdb_byte *buf)
16923 return bfd_get_8 (abfd, buf);
16927 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
16929 return bfd_get_signed_8 (abfd, buf);
16932 static unsigned int
16933 read_2_bytes (bfd *abfd, const gdb_byte *buf)
16935 return bfd_get_16 (abfd, buf);
16939 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
16941 return bfd_get_signed_16 (abfd, buf);
16944 static unsigned int
16945 read_4_bytes (bfd *abfd, const gdb_byte *buf)
16947 return bfd_get_32 (abfd, buf);
16951 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
16953 return bfd_get_signed_32 (abfd, buf);
16957 read_8_bytes (bfd *abfd, const gdb_byte *buf)
16959 return bfd_get_64 (abfd, buf);
16963 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
16964 unsigned int *bytes_read)
16966 struct comp_unit_head *cu_header = &cu->header;
16967 CORE_ADDR retval = 0;
16969 if (cu_header->signed_addr_p)
16971 switch (cu_header->addr_size)
16974 retval = bfd_get_signed_16 (abfd, buf);
16977 retval = bfd_get_signed_32 (abfd, buf);
16980 retval = bfd_get_signed_64 (abfd, buf);
16983 internal_error (__FILE__, __LINE__,
16984 _("read_address: bad switch, signed [in module %s]"),
16985 bfd_get_filename (abfd));
16990 switch (cu_header->addr_size)
16993 retval = bfd_get_16 (abfd, buf);
16996 retval = bfd_get_32 (abfd, buf);
16999 retval = bfd_get_64 (abfd, buf);
17002 internal_error (__FILE__, __LINE__,
17003 _("read_address: bad switch, "
17004 "unsigned [in module %s]"),
17005 bfd_get_filename (abfd));
17009 *bytes_read = cu_header->addr_size;
17013 /* Read the initial length from a section. The (draft) DWARF 3
17014 specification allows the initial length to take up either 4 bytes
17015 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
17016 bytes describe the length and all offsets will be 8 bytes in length
17019 An older, non-standard 64-bit format is also handled by this
17020 function. The older format in question stores the initial length
17021 as an 8-byte quantity without an escape value. Lengths greater
17022 than 2^32 aren't very common which means that the initial 4 bytes
17023 is almost always zero. Since a length value of zero doesn't make
17024 sense for the 32-bit format, this initial zero can be considered to
17025 be an escape value which indicates the presence of the older 64-bit
17026 format. As written, the code can't detect (old format) lengths
17027 greater than 4GB. If it becomes necessary to handle lengths
17028 somewhat larger than 4GB, we could allow other small values (such
17029 as the non-sensical values of 1, 2, and 3) to also be used as
17030 escape values indicating the presence of the old format.
17032 The value returned via bytes_read should be used to increment the
17033 relevant pointer after calling read_initial_length().
17035 [ Note: read_initial_length() and read_offset() are based on the
17036 document entitled "DWARF Debugging Information Format", revision
17037 3, draft 8, dated November 19, 2001. This document was obtained
17040 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
17042 This document is only a draft and is subject to change. (So beware.)
17044 Details regarding the older, non-standard 64-bit format were
17045 determined empirically by examining 64-bit ELF files produced by
17046 the SGI toolchain on an IRIX 6.5 machine.
17048 - Kevin, July 16, 2002
17052 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
17054 LONGEST length = bfd_get_32 (abfd, buf);
17056 if (length == 0xffffffff)
17058 length = bfd_get_64 (abfd, buf + 4);
17061 else if (length == 0)
17063 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
17064 length = bfd_get_64 (abfd, buf);
17075 /* Cover function for read_initial_length.
17076 Returns the length of the object at BUF, and stores the size of the
17077 initial length in *BYTES_READ and stores the size that offsets will be in
17079 If the initial length size is not equivalent to that specified in
17080 CU_HEADER then issue a complaint.
17081 This is useful when reading non-comp-unit headers. */
17084 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
17085 const struct comp_unit_head *cu_header,
17086 unsigned int *bytes_read,
17087 unsigned int *offset_size)
17089 LONGEST length = read_initial_length (abfd, buf, bytes_read);
17091 gdb_assert (cu_header->initial_length_size == 4
17092 || cu_header->initial_length_size == 8
17093 || cu_header->initial_length_size == 12);
17095 if (cu_header->initial_length_size != *bytes_read)
17096 complaint (&symfile_complaints,
17097 _("intermixed 32-bit and 64-bit DWARF sections"));
17099 *offset_size = (*bytes_read == 4) ? 4 : 8;
17103 /* Read an offset from the data stream. The size of the offset is
17104 given by cu_header->offset_size. */
17107 read_offset (bfd *abfd, const gdb_byte *buf,
17108 const struct comp_unit_head *cu_header,
17109 unsigned int *bytes_read)
17111 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
17113 *bytes_read = cu_header->offset_size;
17117 /* Read an offset from the data stream. */
17120 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
17122 LONGEST retval = 0;
17124 switch (offset_size)
17127 retval = bfd_get_32 (abfd, buf);
17130 retval = bfd_get_64 (abfd, buf);
17133 internal_error (__FILE__, __LINE__,
17134 _("read_offset_1: bad switch [in module %s]"),
17135 bfd_get_filename (abfd));
17141 static const gdb_byte *
17142 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
17144 /* If the size of a host char is 8 bits, we can return a pointer
17145 to the buffer, otherwise we have to copy the data to a buffer
17146 allocated on the temporary obstack. */
17147 gdb_assert (HOST_CHAR_BIT == 8);
17151 static const char *
17152 read_direct_string (bfd *abfd, const gdb_byte *buf,
17153 unsigned int *bytes_read_ptr)
17155 /* If the size of a host char is 8 bits, we can return a pointer
17156 to the string, otherwise we have to copy the string to a buffer
17157 allocated on the temporary obstack. */
17158 gdb_assert (HOST_CHAR_BIT == 8);
17161 *bytes_read_ptr = 1;
17164 *bytes_read_ptr = strlen ((const char *) buf) + 1;
17165 return (const char *) buf;
17168 /* Return pointer to string at section SECT offset STR_OFFSET with error
17169 reporting strings FORM_NAME and SECT_NAME. */
17171 static const char *
17172 read_indirect_string_at_offset_from (bfd *abfd, LONGEST str_offset,
17173 struct dwarf2_section_info *sect,
17174 const char *form_name,
17175 const char *sect_name)
17177 dwarf2_read_section (dwarf2_per_objfile->objfile, sect);
17178 if (sect->buffer == NULL)
17179 error (_("%s used without %s section [in module %s]"),
17180 form_name, sect_name, bfd_get_filename (abfd));
17181 if (str_offset >= sect->size)
17182 error (_("%s pointing outside of %s section [in module %s]"),
17183 form_name, sect_name, bfd_get_filename (abfd));
17184 gdb_assert (HOST_CHAR_BIT == 8);
17185 if (sect->buffer[str_offset] == '\0')
17187 return (const char *) (sect->buffer + str_offset);
17190 /* Return pointer to string at .debug_str offset STR_OFFSET. */
17192 static const char *
17193 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
17195 return read_indirect_string_at_offset_from (abfd, str_offset,
17196 &dwarf2_per_objfile->str,
17197 "DW_FORM_strp", ".debug_str");
17200 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
17202 static const char *
17203 read_indirect_line_string_at_offset (bfd *abfd, LONGEST str_offset)
17205 return read_indirect_string_at_offset_from (abfd, str_offset,
17206 &dwarf2_per_objfile->line_str,
17207 "DW_FORM_line_strp",
17208 ".debug_line_str");
17211 /* Read a string at offset STR_OFFSET in the .debug_str section from
17212 the .dwz file DWZ. Throw an error if the offset is too large. If
17213 the string consists of a single NUL byte, return NULL; otherwise
17214 return a pointer to the string. */
17216 static const char *
17217 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
17219 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
17221 if (dwz->str.buffer == NULL)
17222 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
17223 "section [in module %s]"),
17224 bfd_get_filename (dwz->dwz_bfd));
17225 if (str_offset >= dwz->str.size)
17226 error (_("DW_FORM_GNU_strp_alt pointing outside of "
17227 ".debug_str section [in module %s]"),
17228 bfd_get_filename (dwz->dwz_bfd));
17229 gdb_assert (HOST_CHAR_BIT == 8);
17230 if (dwz->str.buffer[str_offset] == '\0')
17232 return (const char *) (dwz->str.buffer + str_offset);
17235 /* Return pointer to string at .debug_str offset as read from BUF.
17236 BUF is assumed to be in a compilation unit described by CU_HEADER.
17237 Return *BYTES_READ_PTR count of bytes read from BUF. */
17239 static const char *
17240 read_indirect_string (bfd *abfd, const gdb_byte *buf,
17241 const struct comp_unit_head *cu_header,
17242 unsigned int *bytes_read_ptr)
17244 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17246 return read_indirect_string_at_offset (abfd, str_offset);
17249 /* Return pointer to string at .debug_line_str offset as read from BUF.
17250 BUF is assumed to be in a compilation unit described by CU_HEADER.
17251 Return *BYTES_READ_PTR count of bytes read from BUF. */
17253 static const char *
17254 read_indirect_line_string (bfd *abfd, const gdb_byte *buf,
17255 const struct comp_unit_head *cu_header,
17256 unsigned int *bytes_read_ptr)
17258 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17260 return read_indirect_line_string_at_offset (abfd, str_offset);
17264 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
17265 unsigned int *bytes_read_ptr)
17268 unsigned int num_read;
17270 unsigned char byte;
17277 byte = bfd_get_8 (abfd, buf);
17280 result |= ((ULONGEST) (byte & 127) << shift);
17281 if ((byte & 128) == 0)
17287 *bytes_read_ptr = num_read;
17292 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
17293 unsigned int *bytes_read_ptr)
17296 int shift, num_read;
17297 unsigned char byte;
17304 byte = bfd_get_8 (abfd, buf);
17307 result |= ((LONGEST) (byte & 127) << shift);
17309 if ((byte & 128) == 0)
17314 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
17315 result |= -(((LONGEST) 1) << shift);
17316 *bytes_read_ptr = num_read;
17320 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
17321 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
17322 ADDR_SIZE is the size of addresses from the CU header. */
17325 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
17327 struct objfile *objfile = dwarf2_per_objfile->objfile;
17328 bfd *abfd = objfile->obfd;
17329 const gdb_byte *info_ptr;
17331 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
17332 if (dwarf2_per_objfile->addr.buffer == NULL)
17333 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
17334 objfile_name (objfile));
17335 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
17336 error (_("DW_FORM_addr_index pointing outside of "
17337 ".debug_addr section [in module %s]"),
17338 objfile_name (objfile));
17339 info_ptr = (dwarf2_per_objfile->addr.buffer
17340 + addr_base + addr_index * addr_size);
17341 if (addr_size == 4)
17342 return bfd_get_32 (abfd, info_ptr);
17344 return bfd_get_64 (abfd, info_ptr);
17347 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
17350 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
17352 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
17355 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
17358 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
17359 unsigned int *bytes_read)
17361 bfd *abfd = cu->objfile->obfd;
17362 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
17364 return read_addr_index (cu, addr_index);
17367 /* Data structure to pass results from dwarf2_read_addr_index_reader
17368 back to dwarf2_read_addr_index. */
17370 struct dwarf2_read_addr_index_data
17372 ULONGEST addr_base;
17376 /* die_reader_func for dwarf2_read_addr_index. */
17379 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
17380 const gdb_byte *info_ptr,
17381 struct die_info *comp_unit_die,
17385 struct dwarf2_cu *cu = reader->cu;
17386 struct dwarf2_read_addr_index_data *aidata =
17387 (struct dwarf2_read_addr_index_data *) data;
17389 aidata->addr_base = cu->addr_base;
17390 aidata->addr_size = cu->header.addr_size;
17393 /* Given an index in .debug_addr, fetch the value.
17394 NOTE: This can be called during dwarf expression evaluation,
17395 long after the debug information has been read, and thus per_cu->cu
17396 may no longer exist. */
17399 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
17400 unsigned int addr_index)
17402 struct objfile *objfile = per_cu->objfile;
17403 struct dwarf2_cu *cu = per_cu->cu;
17404 ULONGEST addr_base;
17407 /* This is intended to be called from outside this file. */
17408 dw2_setup (objfile);
17410 /* We need addr_base and addr_size.
17411 If we don't have PER_CU->cu, we have to get it.
17412 Nasty, but the alternative is storing the needed info in PER_CU,
17413 which at this point doesn't seem justified: it's not clear how frequently
17414 it would get used and it would increase the size of every PER_CU.
17415 Entry points like dwarf2_per_cu_addr_size do a similar thing
17416 so we're not in uncharted territory here.
17417 Alas we need to be a bit more complicated as addr_base is contained
17420 We don't need to read the entire CU(/TU).
17421 We just need the header and top level die.
17423 IWBN to use the aging mechanism to let us lazily later discard the CU.
17424 For now we skip this optimization. */
17428 addr_base = cu->addr_base;
17429 addr_size = cu->header.addr_size;
17433 struct dwarf2_read_addr_index_data aidata;
17435 /* Note: We can't use init_cutu_and_read_dies_simple here,
17436 we need addr_base. */
17437 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
17438 dwarf2_read_addr_index_reader, &aidata);
17439 addr_base = aidata.addr_base;
17440 addr_size = aidata.addr_size;
17443 return read_addr_index_1 (addr_index, addr_base, addr_size);
17446 /* Given a DW_FORM_GNU_str_index, fetch the string.
17447 This is only used by the Fission support. */
17449 static const char *
17450 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
17452 struct objfile *objfile = dwarf2_per_objfile->objfile;
17453 const char *objf_name = objfile_name (objfile);
17454 bfd *abfd = objfile->obfd;
17455 struct dwarf2_cu *cu = reader->cu;
17456 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
17457 struct dwarf2_section_info *str_offsets_section =
17458 &reader->dwo_file->sections.str_offsets;
17459 const gdb_byte *info_ptr;
17460 ULONGEST str_offset;
17461 static const char form_name[] = "DW_FORM_GNU_str_index";
17463 dwarf2_read_section (objfile, str_section);
17464 dwarf2_read_section (objfile, str_offsets_section);
17465 if (str_section->buffer == NULL)
17466 error (_("%s used without .debug_str.dwo section"
17467 " in CU at offset 0x%x [in module %s]"),
17468 form_name, to_underlying (cu->header.sect_off), objf_name);
17469 if (str_offsets_section->buffer == NULL)
17470 error (_("%s used without .debug_str_offsets.dwo section"
17471 " in CU at offset 0x%x [in module %s]"),
17472 form_name, to_underlying (cu->header.sect_off), objf_name);
17473 if (str_index * cu->header.offset_size >= str_offsets_section->size)
17474 error (_("%s pointing outside of .debug_str_offsets.dwo"
17475 " section in CU at offset 0x%x [in module %s]"),
17476 form_name, to_underlying (cu->header.sect_off), objf_name);
17477 info_ptr = (str_offsets_section->buffer
17478 + str_index * cu->header.offset_size);
17479 if (cu->header.offset_size == 4)
17480 str_offset = bfd_get_32 (abfd, info_ptr);
17482 str_offset = bfd_get_64 (abfd, info_ptr);
17483 if (str_offset >= str_section->size)
17484 error (_("Offset from %s pointing outside of"
17485 " .debug_str.dwo section in CU at offset 0x%x [in module %s]"),
17486 form_name, to_underlying (cu->header.sect_off), objf_name);
17487 return (const char *) (str_section->buffer + str_offset);
17490 /* Return the length of an LEB128 number in BUF. */
17493 leb128_size (const gdb_byte *buf)
17495 const gdb_byte *begin = buf;
17501 if ((byte & 128) == 0)
17502 return buf - begin;
17507 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
17516 cu->language = language_c;
17519 case DW_LANG_C_plus_plus:
17520 case DW_LANG_C_plus_plus_11:
17521 case DW_LANG_C_plus_plus_14:
17522 cu->language = language_cplus;
17525 cu->language = language_d;
17527 case DW_LANG_Fortran77:
17528 case DW_LANG_Fortran90:
17529 case DW_LANG_Fortran95:
17530 case DW_LANG_Fortran03:
17531 case DW_LANG_Fortran08:
17532 cu->language = language_fortran;
17535 cu->language = language_go;
17537 case DW_LANG_Mips_Assembler:
17538 cu->language = language_asm;
17540 case DW_LANG_Ada83:
17541 case DW_LANG_Ada95:
17542 cu->language = language_ada;
17544 case DW_LANG_Modula2:
17545 cu->language = language_m2;
17547 case DW_LANG_Pascal83:
17548 cu->language = language_pascal;
17551 cu->language = language_objc;
17554 case DW_LANG_Rust_old:
17555 cu->language = language_rust;
17557 case DW_LANG_Cobol74:
17558 case DW_LANG_Cobol85:
17560 cu->language = language_minimal;
17563 cu->language_defn = language_def (cu->language);
17566 /* Return the named attribute or NULL if not there. */
17568 static struct attribute *
17569 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17574 struct attribute *spec = NULL;
17576 for (i = 0; i < die->num_attrs; ++i)
17578 if (die->attrs[i].name == name)
17579 return &die->attrs[i];
17580 if (die->attrs[i].name == DW_AT_specification
17581 || die->attrs[i].name == DW_AT_abstract_origin)
17582 spec = &die->attrs[i];
17588 die = follow_die_ref (die, spec, &cu);
17594 /* Return the named attribute or NULL if not there,
17595 but do not follow DW_AT_specification, etc.
17596 This is for use in contexts where we're reading .debug_types dies.
17597 Following DW_AT_specification, DW_AT_abstract_origin will take us
17598 back up the chain, and we want to go down. */
17600 static struct attribute *
17601 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
17605 for (i = 0; i < die->num_attrs; ++i)
17606 if (die->attrs[i].name == name)
17607 return &die->attrs[i];
17612 /* Return the string associated with a string-typed attribute, or NULL if it
17613 is either not found or is of an incorrect type. */
17615 static const char *
17616 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17618 struct attribute *attr;
17619 const char *str = NULL;
17621 attr = dwarf2_attr (die, name, cu);
17625 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
17626 || attr->form == DW_FORM_string || DW_FORM_GNU_str_index
17627 || attr->form == DW_FORM_GNU_strp_alt)
17628 str = DW_STRING (attr);
17630 complaint (&symfile_complaints,
17631 _("string type expected for attribute %s for "
17632 "DIE at 0x%x in module %s"),
17633 dwarf_attr_name (name), to_underlying (die->sect_off),
17634 objfile_name (cu->objfile));
17640 /* Return non-zero iff the attribute NAME is defined for the given DIE,
17641 and holds a non-zero value. This function should only be used for
17642 DW_FORM_flag or DW_FORM_flag_present attributes. */
17645 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
17647 struct attribute *attr = dwarf2_attr (die, name, cu);
17649 return (attr && DW_UNSND (attr));
17653 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
17655 /* A DIE is a declaration if it has a DW_AT_declaration attribute
17656 which value is non-zero. However, we have to be careful with
17657 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
17658 (via dwarf2_flag_true_p) follows this attribute. So we may
17659 end up accidently finding a declaration attribute that belongs
17660 to a different DIE referenced by the specification attribute,
17661 even though the given DIE does not have a declaration attribute. */
17662 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
17663 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
17666 /* Return the die giving the specification for DIE, if there is
17667 one. *SPEC_CU is the CU containing DIE on input, and the CU
17668 containing the return value on output. If there is no
17669 specification, but there is an abstract origin, that is
17672 static struct die_info *
17673 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
17675 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
17678 if (spec_attr == NULL)
17679 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
17681 if (spec_attr == NULL)
17684 return follow_die_ref (die, spec_attr, spec_cu);
17687 /* Stub for free_line_header to match void * callback types. */
17690 free_line_header_voidp (void *arg)
17692 struct line_header *lh = (struct line_header *) arg;
17698 line_header::add_include_dir (const char *include_dir)
17700 if (dwarf_line_debug >= 2)
17701 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
17702 include_dirs.size () + 1, include_dir);
17704 include_dirs.push_back (include_dir);
17708 line_header::add_file_name (const char *name,
17710 unsigned int mod_time,
17711 unsigned int length)
17713 if (dwarf_line_debug >= 2)
17714 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
17715 (unsigned) file_names.size () + 1, name);
17717 file_names.emplace_back (name, d_index, mod_time, length);
17720 /* A convenience function to find the proper .debug_line section for a CU. */
17722 static struct dwarf2_section_info *
17723 get_debug_line_section (struct dwarf2_cu *cu)
17725 struct dwarf2_section_info *section;
17727 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
17729 if (cu->dwo_unit && cu->per_cu->is_debug_types)
17730 section = &cu->dwo_unit->dwo_file->sections.line;
17731 else if (cu->per_cu->is_dwz)
17733 struct dwz_file *dwz = dwarf2_get_dwz_file ();
17735 section = &dwz->line;
17738 section = &dwarf2_per_objfile->line;
17743 /* Read directory or file name entry format, starting with byte of
17744 format count entries, ULEB128 pairs of entry formats, ULEB128 of
17745 entries count and the entries themselves in the described entry
17749 read_formatted_entries (bfd *abfd, const gdb_byte **bufp,
17750 struct line_header *lh,
17751 const struct comp_unit_head *cu_header,
17752 void (*callback) (struct line_header *lh,
17755 unsigned int mod_time,
17756 unsigned int length))
17758 gdb_byte format_count, formati;
17759 ULONGEST data_count, datai;
17760 const gdb_byte *buf = *bufp;
17761 const gdb_byte *format_header_data;
17763 unsigned int bytes_read;
17765 format_count = read_1_byte (abfd, buf);
17767 format_header_data = buf;
17768 for (formati = 0; formati < format_count; formati++)
17770 read_unsigned_leb128 (abfd, buf, &bytes_read);
17772 read_unsigned_leb128 (abfd, buf, &bytes_read);
17776 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
17778 for (datai = 0; datai < data_count; datai++)
17780 const gdb_byte *format = format_header_data;
17781 struct file_entry fe;
17783 for (formati = 0; formati < format_count; formati++)
17785 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
17786 format += bytes_read;
17788 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
17789 format += bytes_read;
17791 gdb::optional<const char *> string;
17792 gdb::optional<unsigned int> uint;
17796 case DW_FORM_string:
17797 string.emplace (read_direct_string (abfd, buf, &bytes_read));
17801 case DW_FORM_line_strp:
17802 string.emplace (read_indirect_line_string (abfd, buf,
17808 case DW_FORM_data1:
17809 uint.emplace (read_1_byte (abfd, buf));
17813 case DW_FORM_data2:
17814 uint.emplace (read_2_bytes (abfd, buf));
17818 case DW_FORM_data4:
17819 uint.emplace (read_4_bytes (abfd, buf));
17823 case DW_FORM_data8:
17824 uint.emplace (read_8_bytes (abfd, buf));
17828 case DW_FORM_udata:
17829 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
17833 case DW_FORM_block:
17834 /* It is valid only for DW_LNCT_timestamp which is ignored by
17839 switch (content_type)
17842 if (string.has_value ())
17845 case DW_LNCT_directory_index:
17846 if (uint.has_value ())
17847 fe.d_index = (dir_index) *uint;
17849 case DW_LNCT_timestamp:
17850 if (uint.has_value ())
17851 fe.mod_time = *uint;
17854 if (uint.has_value ())
17860 complaint (&symfile_complaints,
17861 _("Unknown format content type %s"),
17862 pulongest (content_type));
17866 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
17872 /* Read the statement program header starting at OFFSET in
17873 .debug_line, or .debug_line.dwo. Return a pointer
17874 to a struct line_header, allocated using xmalloc.
17875 Returns NULL if there is a problem reading the header, e.g., if it
17876 has a version we don't understand.
17878 NOTE: the strings in the include directory and file name tables of
17879 the returned object point into the dwarf line section buffer,
17880 and must not be freed. */
17882 static line_header_up
17883 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
17885 const gdb_byte *line_ptr;
17886 unsigned int bytes_read, offset_size;
17888 const char *cur_dir, *cur_file;
17889 struct dwarf2_section_info *section;
17892 section = get_debug_line_section (cu);
17893 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
17894 if (section->buffer == NULL)
17896 if (cu->dwo_unit && cu->per_cu->is_debug_types)
17897 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
17899 complaint (&symfile_complaints, _("missing .debug_line section"));
17903 /* We can't do this until we know the section is non-empty.
17904 Only then do we know we have such a section. */
17905 abfd = get_section_bfd_owner (section);
17907 /* Make sure that at least there's room for the total_length field.
17908 That could be 12 bytes long, but we're just going to fudge that. */
17909 if (to_underlying (sect_off) + 4 >= section->size)
17911 dwarf2_statement_list_fits_in_line_number_section_complaint ();
17915 line_header_up lh (new line_header ());
17917 lh->sect_off = sect_off;
17918 lh->offset_in_dwz = cu->per_cu->is_dwz;
17920 line_ptr = section->buffer + to_underlying (sect_off);
17922 /* Read in the header. */
17924 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
17925 &bytes_read, &offset_size);
17926 line_ptr += bytes_read;
17927 if (line_ptr + lh->total_length > (section->buffer + section->size))
17929 dwarf2_statement_list_fits_in_line_number_section_complaint ();
17932 lh->statement_program_end = line_ptr + lh->total_length;
17933 lh->version = read_2_bytes (abfd, line_ptr);
17935 if (lh->version > 5)
17937 /* This is a version we don't understand. The format could have
17938 changed in ways we don't handle properly so just punt. */
17939 complaint (&symfile_complaints,
17940 _("unsupported version in .debug_line section"));
17943 if (lh->version >= 5)
17945 gdb_byte segment_selector_size;
17947 /* Skip address size. */
17948 read_1_byte (abfd, line_ptr);
17951 segment_selector_size = read_1_byte (abfd, line_ptr);
17953 if (segment_selector_size != 0)
17955 complaint (&symfile_complaints,
17956 _("unsupported segment selector size %u "
17957 "in .debug_line section"),
17958 segment_selector_size);
17962 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
17963 line_ptr += offset_size;
17964 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
17966 if (lh->version >= 4)
17968 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
17972 lh->maximum_ops_per_instruction = 1;
17974 if (lh->maximum_ops_per_instruction == 0)
17976 lh->maximum_ops_per_instruction = 1;
17977 complaint (&symfile_complaints,
17978 _("invalid maximum_ops_per_instruction "
17979 "in `.debug_line' section"));
17982 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
17984 lh->line_base = read_1_signed_byte (abfd, line_ptr);
17986 lh->line_range = read_1_byte (abfd, line_ptr);
17988 lh->opcode_base = read_1_byte (abfd, line_ptr);
17990 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
17992 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
17993 for (i = 1; i < lh->opcode_base; ++i)
17995 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
17999 if (lh->version >= 5)
18001 /* Read directory table. */
18002 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18003 [] (struct line_header *lh, const char *name,
18004 dir_index d_index, unsigned int mod_time,
18005 unsigned int length)
18007 lh->add_include_dir (name);
18010 /* Read file name table. */
18011 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18012 [] (struct line_header *lh, const char *name,
18013 dir_index d_index, unsigned int mod_time,
18014 unsigned int length)
18016 lh->add_file_name (name, d_index, mod_time, length);
18021 /* Read directory table. */
18022 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
18024 line_ptr += bytes_read;
18025 lh->add_include_dir (cur_dir);
18027 line_ptr += bytes_read;
18029 /* Read file name table. */
18030 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
18032 unsigned int mod_time, length;
18035 line_ptr += bytes_read;
18036 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18037 line_ptr += bytes_read;
18038 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18039 line_ptr += bytes_read;
18040 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18041 line_ptr += bytes_read;
18043 lh->add_file_name (cur_file, d_index, mod_time, length);
18045 line_ptr += bytes_read;
18047 lh->statement_program_start = line_ptr;
18049 if (line_ptr > (section->buffer + section->size))
18050 complaint (&symfile_complaints,
18051 _("line number info header doesn't "
18052 "fit in `.debug_line' section"));
18057 /* Subroutine of dwarf_decode_lines to simplify it.
18058 Return the file name of the psymtab for included file FILE_INDEX
18059 in line header LH of PST.
18060 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
18061 If space for the result is malloc'd, it will be freed by a cleanup.
18062 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
18064 The function creates dangling cleanup registration. */
18066 static const char *
18067 psymtab_include_file_name (const struct line_header *lh, int file_index,
18068 const struct partial_symtab *pst,
18069 const char *comp_dir)
18071 const file_entry &fe = lh->file_names[file_index];
18072 const char *include_name = fe.name;
18073 const char *include_name_to_compare = include_name;
18074 const char *pst_filename;
18075 char *copied_name = NULL;
18078 const char *dir_name = fe.include_dir (lh);
18080 if (!IS_ABSOLUTE_PATH (include_name)
18081 && (dir_name != NULL || comp_dir != NULL))
18083 /* Avoid creating a duplicate psymtab for PST.
18084 We do this by comparing INCLUDE_NAME and PST_FILENAME.
18085 Before we do the comparison, however, we need to account
18086 for DIR_NAME and COMP_DIR.
18087 First prepend dir_name (if non-NULL). If we still don't
18088 have an absolute path prepend comp_dir (if non-NULL).
18089 However, the directory we record in the include-file's
18090 psymtab does not contain COMP_DIR (to match the
18091 corresponding symtab(s)).
18096 bash$ gcc -g ./hello.c
18097 include_name = "hello.c"
18099 DW_AT_comp_dir = comp_dir = "/tmp"
18100 DW_AT_name = "./hello.c"
18104 if (dir_name != NULL)
18106 char *tem = concat (dir_name, SLASH_STRING,
18107 include_name, (char *)NULL);
18109 make_cleanup (xfree, tem);
18110 include_name = tem;
18111 include_name_to_compare = include_name;
18113 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
18115 char *tem = concat (comp_dir, SLASH_STRING,
18116 include_name, (char *)NULL);
18118 make_cleanup (xfree, tem);
18119 include_name_to_compare = tem;
18123 pst_filename = pst->filename;
18124 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
18126 copied_name = concat (pst->dirname, SLASH_STRING,
18127 pst_filename, (char *)NULL);
18128 pst_filename = copied_name;
18131 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
18133 if (copied_name != NULL)
18134 xfree (copied_name);
18138 return include_name;
18141 /* State machine to track the state of the line number program. */
18143 class lnp_state_machine
18146 /* Initialize a machine state for the start of a line number
18148 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
18150 file_entry *current_file ()
18152 /* lh->file_names is 0-based, but the file name numbers in the
18153 statement program are 1-based. */
18154 return m_line_header->file_name_at (m_file);
18157 /* Record the line in the state machine. END_SEQUENCE is true if
18158 we're processing the end of a sequence. */
18159 void record_line (bool end_sequence);
18161 /* Check address and if invalid nop-out the rest of the lines in this
18163 void check_line_address (struct dwarf2_cu *cu,
18164 const gdb_byte *line_ptr,
18165 CORE_ADDR lowpc, CORE_ADDR address);
18167 void handle_set_discriminator (unsigned int discriminator)
18169 m_discriminator = discriminator;
18170 m_line_has_non_zero_discriminator |= discriminator != 0;
18173 /* Handle DW_LNE_set_address. */
18174 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
18177 address += baseaddr;
18178 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
18181 /* Handle DW_LNS_advance_pc. */
18182 void handle_advance_pc (CORE_ADDR adjust);
18184 /* Handle a special opcode. */
18185 void handle_special_opcode (unsigned char op_code);
18187 /* Handle DW_LNS_advance_line. */
18188 void handle_advance_line (int line_delta)
18190 advance_line (line_delta);
18193 /* Handle DW_LNS_set_file. */
18194 void handle_set_file (file_name_index file);
18196 /* Handle DW_LNS_negate_stmt. */
18197 void handle_negate_stmt ()
18199 m_is_stmt = !m_is_stmt;
18202 /* Handle DW_LNS_const_add_pc. */
18203 void handle_const_add_pc ();
18205 /* Handle DW_LNS_fixed_advance_pc. */
18206 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
18208 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18212 /* Handle DW_LNS_copy. */
18213 void handle_copy ()
18215 record_line (false);
18216 m_discriminator = 0;
18219 /* Handle DW_LNE_end_sequence. */
18220 void handle_end_sequence ()
18222 m_record_line_callback = ::record_line;
18226 /* Advance the line by LINE_DELTA. */
18227 void advance_line (int line_delta)
18229 m_line += line_delta;
18231 if (line_delta != 0)
18232 m_line_has_non_zero_discriminator = m_discriminator != 0;
18235 gdbarch *m_gdbarch;
18237 /* True if we're recording lines.
18238 Otherwise we're building partial symtabs and are just interested in
18239 finding include files mentioned by the line number program. */
18240 bool m_record_lines_p;
18242 /* The line number header. */
18243 line_header *m_line_header;
18245 /* These are part of the standard DWARF line number state machine,
18246 and initialized according to the DWARF spec. */
18248 unsigned char m_op_index = 0;
18249 /* The line table index (1-based) of the current file. */
18250 file_name_index m_file = (file_name_index) 1;
18251 unsigned int m_line = 1;
18253 /* These are initialized in the constructor. */
18255 CORE_ADDR m_address;
18257 unsigned int m_discriminator;
18259 /* Additional bits of state we need to track. */
18261 /* The last file that we called dwarf2_start_subfile for.
18262 This is only used for TLLs. */
18263 unsigned int m_last_file = 0;
18264 /* The last file a line number was recorded for. */
18265 struct subfile *m_last_subfile = NULL;
18267 /* The function to call to record a line. */
18268 record_line_ftype *m_record_line_callback = NULL;
18270 /* The last line number that was recorded, used to coalesce
18271 consecutive entries for the same line. This can happen, for
18272 example, when discriminators are present. PR 17276. */
18273 unsigned int m_last_line = 0;
18274 bool m_line_has_non_zero_discriminator = false;
18278 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
18280 CORE_ADDR addr_adj = (((m_op_index + adjust)
18281 / m_line_header->maximum_ops_per_instruction)
18282 * m_line_header->minimum_instruction_length);
18283 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18284 m_op_index = ((m_op_index + adjust)
18285 % m_line_header->maximum_ops_per_instruction);
18289 lnp_state_machine::handle_special_opcode (unsigned char op_code)
18291 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
18292 CORE_ADDR addr_adj = (((m_op_index
18293 + (adj_opcode / m_line_header->line_range))
18294 / m_line_header->maximum_ops_per_instruction)
18295 * m_line_header->minimum_instruction_length);
18296 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18297 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
18298 % m_line_header->maximum_ops_per_instruction);
18300 int line_delta = (m_line_header->line_base
18301 + (adj_opcode % m_line_header->line_range));
18302 advance_line (line_delta);
18303 record_line (false);
18304 m_discriminator = 0;
18308 lnp_state_machine::handle_set_file (file_name_index file)
18312 const file_entry *fe = current_file ();
18314 dwarf2_debug_line_missing_file_complaint ();
18315 else if (m_record_lines_p)
18317 const char *dir = fe->include_dir (m_line_header);
18319 m_last_subfile = current_subfile;
18320 m_line_has_non_zero_discriminator = m_discriminator != 0;
18321 dwarf2_start_subfile (fe->name, dir);
18326 lnp_state_machine::handle_const_add_pc ()
18329 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
18332 = (((m_op_index + adjust)
18333 / m_line_header->maximum_ops_per_instruction)
18334 * m_line_header->minimum_instruction_length);
18336 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18337 m_op_index = ((m_op_index + adjust)
18338 % m_line_header->maximum_ops_per_instruction);
18341 /* Ignore this record_line request. */
18344 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
18349 /* Return non-zero if we should add LINE to the line number table.
18350 LINE is the line to add, LAST_LINE is the last line that was added,
18351 LAST_SUBFILE is the subfile for LAST_LINE.
18352 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
18353 had a non-zero discriminator.
18355 We have to be careful in the presence of discriminators.
18356 E.g., for this line:
18358 for (i = 0; i < 100000; i++);
18360 clang can emit four line number entries for that one line,
18361 each with a different discriminator.
18362 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
18364 However, we want gdb to coalesce all four entries into one.
18365 Otherwise the user could stepi into the middle of the line and
18366 gdb would get confused about whether the pc really was in the
18367 middle of the line.
18369 Things are further complicated by the fact that two consecutive
18370 line number entries for the same line is a heuristic used by gcc
18371 to denote the end of the prologue. So we can't just discard duplicate
18372 entries, we have to be selective about it. The heuristic we use is
18373 that we only collapse consecutive entries for the same line if at least
18374 one of those entries has a non-zero discriminator. PR 17276.
18376 Note: Addresses in the line number state machine can never go backwards
18377 within one sequence, thus this coalescing is ok. */
18380 dwarf_record_line_p (unsigned int line, unsigned int last_line,
18381 int line_has_non_zero_discriminator,
18382 struct subfile *last_subfile)
18384 if (current_subfile != last_subfile)
18386 if (line != last_line)
18388 /* Same line for the same file that we've seen already.
18389 As a last check, for pr 17276, only record the line if the line
18390 has never had a non-zero discriminator. */
18391 if (!line_has_non_zero_discriminator)
18396 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
18397 in the line table of subfile SUBFILE. */
18400 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
18401 unsigned int line, CORE_ADDR address,
18402 record_line_ftype p_record_line)
18404 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
18406 if (dwarf_line_debug)
18408 fprintf_unfiltered (gdb_stdlog,
18409 "Recording line %u, file %s, address %s\n",
18410 line, lbasename (subfile->name),
18411 paddress (gdbarch, address));
18414 (*p_record_line) (subfile, line, addr);
18417 /* Subroutine of dwarf_decode_lines_1 to simplify it.
18418 Mark the end of a set of line number records.
18419 The arguments are the same as for dwarf_record_line_1.
18420 If SUBFILE is NULL the request is ignored. */
18423 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
18424 CORE_ADDR address, record_line_ftype p_record_line)
18426 if (subfile == NULL)
18429 if (dwarf_line_debug)
18431 fprintf_unfiltered (gdb_stdlog,
18432 "Finishing current line, file %s, address %s\n",
18433 lbasename (subfile->name),
18434 paddress (gdbarch, address));
18437 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
18441 lnp_state_machine::record_line (bool end_sequence)
18443 if (dwarf_line_debug)
18445 fprintf_unfiltered (gdb_stdlog,
18446 "Processing actual line %u: file %u,"
18447 " address %s, is_stmt %u, discrim %u\n",
18448 m_line, to_underlying (m_file),
18449 paddress (m_gdbarch, m_address),
18450 m_is_stmt, m_discriminator);
18453 file_entry *fe = current_file ();
18456 dwarf2_debug_line_missing_file_complaint ();
18457 /* For now we ignore lines not starting on an instruction boundary.
18458 But not when processing end_sequence for compatibility with the
18459 previous version of the code. */
18460 else if (m_op_index == 0 || end_sequence)
18462 fe->included_p = 1;
18463 if (m_record_lines_p && m_is_stmt)
18465 if (m_last_subfile != current_subfile || end_sequence)
18467 dwarf_finish_line (m_gdbarch, m_last_subfile,
18468 m_address, m_record_line_callback);
18473 if (dwarf_record_line_p (m_line, m_last_line,
18474 m_line_has_non_zero_discriminator,
18477 dwarf_record_line_1 (m_gdbarch, current_subfile,
18479 m_record_line_callback);
18481 m_last_subfile = current_subfile;
18482 m_last_line = m_line;
18488 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
18489 bool record_lines_p)
18492 m_record_lines_p = record_lines_p;
18493 m_line_header = lh;
18495 m_record_line_callback = ::record_line;
18497 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
18498 was a line entry for it so that the backend has a chance to adjust it
18499 and also record it in case it needs it. This is currently used by MIPS
18500 code, cf. `mips_adjust_dwarf2_line'. */
18501 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
18502 m_is_stmt = lh->default_is_stmt;
18503 m_discriminator = 0;
18507 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
18508 const gdb_byte *line_ptr,
18509 CORE_ADDR lowpc, CORE_ADDR address)
18511 /* If address < lowpc then it's not a usable value, it's outside the
18512 pc range of the CU. However, we restrict the test to only address
18513 values of zero to preserve GDB's previous behaviour which is to
18514 handle the specific case of a function being GC'd by the linker. */
18516 if (address == 0 && address < lowpc)
18518 /* This line table is for a function which has been
18519 GCd by the linker. Ignore it. PR gdb/12528 */
18521 struct objfile *objfile = cu->objfile;
18522 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
18524 complaint (&symfile_complaints,
18525 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
18526 line_offset, objfile_name (objfile));
18527 m_record_line_callback = noop_record_line;
18528 /* Note: record_line_callback is left as noop_record_line until
18529 we see DW_LNE_end_sequence. */
18533 /* Subroutine of dwarf_decode_lines to simplify it.
18534 Process the line number information in LH.
18535 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
18536 program in order to set included_p for every referenced header. */
18539 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
18540 const int decode_for_pst_p, CORE_ADDR lowpc)
18542 const gdb_byte *line_ptr, *extended_end;
18543 const gdb_byte *line_end;
18544 unsigned int bytes_read, extended_len;
18545 unsigned char op_code, extended_op;
18546 CORE_ADDR baseaddr;
18547 struct objfile *objfile = cu->objfile;
18548 bfd *abfd = objfile->obfd;
18549 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18550 /* True if we're recording line info (as opposed to building partial
18551 symtabs and just interested in finding include files mentioned by
18552 the line number program). */
18553 bool record_lines_p = !decode_for_pst_p;
18555 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
18557 line_ptr = lh->statement_program_start;
18558 line_end = lh->statement_program_end;
18560 /* Read the statement sequences until there's nothing left. */
18561 while (line_ptr < line_end)
18563 /* The DWARF line number program state machine. Reset the state
18564 machine at the start of each sequence. */
18565 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
18566 bool end_sequence = false;
18568 if (record_lines_p)
18570 /* Start a subfile for the current file of the state
18572 const file_entry *fe = state_machine.current_file ();
18575 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
18578 /* Decode the table. */
18579 while (line_ptr < line_end && !end_sequence)
18581 op_code = read_1_byte (abfd, line_ptr);
18584 if (op_code >= lh->opcode_base)
18586 /* Special opcode. */
18587 state_machine.handle_special_opcode (op_code);
18589 else switch (op_code)
18591 case DW_LNS_extended_op:
18592 extended_len = read_unsigned_leb128 (abfd, line_ptr,
18594 line_ptr += bytes_read;
18595 extended_end = line_ptr + extended_len;
18596 extended_op = read_1_byte (abfd, line_ptr);
18598 switch (extended_op)
18600 case DW_LNE_end_sequence:
18601 state_machine.handle_end_sequence ();
18602 end_sequence = true;
18604 case DW_LNE_set_address:
18607 = read_address (abfd, line_ptr, cu, &bytes_read);
18608 line_ptr += bytes_read;
18610 state_machine.check_line_address (cu, line_ptr,
18612 state_machine.handle_set_address (baseaddr, address);
18615 case DW_LNE_define_file:
18617 const char *cur_file;
18618 unsigned int mod_time, length;
18621 cur_file = read_direct_string (abfd, line_ptr,
18623 line_ptr += bytes_read;
18624 dindex = (dir_index)
18625 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18626 line_ptr += bytes_read;
18628 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18629 line_ptr += bytes_read;
18631 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18632 line_ptr += bytes_read;
18633 lh->add_file_name (cur_file, dindex, mod_time, length);
18636 case DW_LNE_set_discriminator:
18638 /* The discriminator is not interesting to the
18639 debugger; just ignore it. We still need to
18640 check its value though:
18641 if there are consecutive entries for the same
18642 (non-prologue) line we want to coalesce them.
18645 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18646 line_ptr += bytes_read;
18648 state_machine.handle_set_discriminator (discr);
18652 complaint (&symfile_complaints,
18653 _("mangled .debug_line section"));
18656 /* Make sure that we parsed the extended op correctly. If e.g.
18657 we expected a different address size than the producer used,
18658 we may have read the wrong number of bytes. */
18659 if (line_ptr != extended_end)
18661 complaint (&symfile_complaints,
18662 _("mangled .debug_line section"));
18667 state_machine.handle_copy ();
18669 case DW_LNS_advance_pc:
18672 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18673 line_ptr += bytes_read;
18675 state_machine.handle_advance_pc (adjust);
18678 case DW_LNS_advance_line:
18681 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
18682 line_ptr += bytes_read;
18684 state_machine.handle_advance_line (line_delta);
18687 case DW_LNS_set_file:
18689 file_name_index file
18690 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
18692 line_ptr += bytes_read;
18694 state_machine.handle_set_file (file);
18697 case DW_LNS_set_column:
18698 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18699 line_ptr += bytes_read;
18701 case DW_LNS_negate_stmt:
18702 state_machine.handle_negate_stmt ();
18704 case DW_LNS_set_basic_block:
18706 /* Add to the address register of the state machine the
18707 address increment value corresponding to special opcode
18708 255. I.e., this value is scaled by the minimum
18709 instruction length since special opcode 255 would have
18710 scaled the increment. */
18711 case DW_LNS_const_add_pc:
18712 state_machine.handle_const_add_pc ();
18714 case DW_LNS_fixed_advance_pc:
18716 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
18719 state_machine.handle_fixed_advance_pc (addr_adj);
18724 /* Unknown standard opcode, ignore it. */
18727 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
18729 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18730 line_ptr += bytes_read;
18737 dwarf2_debug_line_missing_end_sequence_complaint ();
18739 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
18740 in which case we still finish recording the last line). */
18741 state_machine.record_line (true);
18745 /* Decode the Line Number Program (LNP) for the given line_header
18746 structure and CU. The actual information extracted and the type
18747 of structures created from the LNP depends on the value of PST.
18749 1. If PST is NULL, then this procedure uses the data from the program
18750 to create all necessary symbol tables, and their linetables.
18752 2. If PST is not NULL, this procedure reads the program to determine
18753 the list of files included by the unit represented by PST, and
18754 builds all the associated partial symbol tables.
18756 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
18757 It is used for relative paths in the line table.
18758 NOTE: When processing partial symtabs (pst != NULL),
18759 comp_dir == pst->dirname.
18761 NOTE: It is important that psymtabs have the same file name (via strcmp)
18762 as the corresponding symtab. Since COMP_DIR is not used in the name of the
18763 symtab we don't use it in the name of the psymtabs we create.
18764 E.g. expand_line_sal requires this when finding psymtabs to expand.
18765 A good testcase for this is mb-inline.exp.
18767 LOWPC is the lowest address in CU (or 0 if not known).
18769 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
18770 for its PC<->lines mapping information. Otherwise only the filename
18771 table is read in. */
18774 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
18775 struct dwarf2_cu *cu, struct partial_symtab *pst,
18776 CORE_ADDR lowpc, int decode_mapping)
18778 struct objfile *objfile = cu->objfile;
18779 const int decode_for_pst_p = (pst != NULL);
18781 if (decode_mapping)
18782 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
18784 if (decode_for_pst_p)
18788 /* Now that we're done scanning the Line Header Program, we can
18789 create the psymtab of each included file. */
18790 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
18791 if (lh->file_names[file_index].included_p == 1)
18793 const char *include_name =
18794 psymtab_include_file_name (lh, file_index, pst, comp_dir);
18795 if (include_name != NULL)
18796 dwarf2_create_include_psymtab (include_name, pst, objfile);
18801 /* Make sure a symtab is created for every file, even files
18802 which contain only variables (i.e. no code with associated
18804 struct compunit_symtab *cust = buildsym_compunit_symtab ();
18807 for (i = 0; i < lh->file_names.size (); i++)
18809 file_entry &fe = lh->file_names[i];
18811 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
18813 if (current_subfile->symtab == NULL)
18815 current_subfile->symtab
18816 = allocate_symtab (cust, current_subfile->name);
18818 fe.symtab = current_subfile->symtab;
18823 /* Start a subfile for DWARF. FILENAME is the name of the file and
18824 DIRNAME the name of the source directory which contains FILENAME
18825 or NULL if not known.
18826 This routine tries to keep line numbers from identical absolute and
18827 relative file names in a common subfile.
18829 Using the `list' example from the GDB testsuite, which resides in
18830 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
18831 of /srcdir/list0.c yields the following debugging information for list0.c:
18833 DW_AT_name: /srcdir/list0.c
18834 DW_AT_comp_dir: /compdir
18835 files.files[0].name: list0.h
18836 files.files[0].dir: /srcdir
18837 files.files[1].name: list0.c
18838 files.files[1].dir: /srcdir
18840 The line number information for list0.c has to end up in a single
18841 subfile, so that `break /srcdir/list0.c:1' works as expected.
18842 start_subfile will ensure that this happens provided that we pass the
18843 concatenation of files.files[1].dir and files.files[1].name as the
18847 dwarf2_start_subfile (const char *filename, const char *dirname)
18851 /* In order not to lose the line information directory,
18852 we concatenate it to the filename when it makes sense.
18853 Note that the Dwarf3 standard says (speaking of filenames in line
18854 information): ``The directory index is ignored for file names
18855 that represent full path names''. Thus ignoring dirname in the
18856 `else' branch below isn't an issue. */
18858 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
18860 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
18864 start_subfile (filename);
18870 /* Start a symtab for DWARF.
18871 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
18873 static struct compunit_symtab *
18874 dwarf2_start_symtab (struct dwarf2_cu *cu,
18875 const char *name, const char *comp_dir, CORE_ADDR low_pc)
18877 struct compunit_symtab *cust
18878 = start_symtab (cu->objfile, name, comp_dir, low_pc);
18880 record_debugformat ("DWARF 2");
18881 record_producer (cu->producer);
18883 /* We assume that we're processing GCC output. */
18884 processing_gcc_compilation = 2;
18886 cu->processing_has_namespace_info = 0;
18892 var_decode_location (struct attribute *attr, struct symbol *sym,
18893 struct dwarf2_cu *cu)
18895 struct objfile *objfile = cu->objfile;
18896 struct comp_unit_head *cu_header = &cu->header;
18898 /* NOTE drow/2003-01-30: There used to be a comment and some special
18899 code here to turn a symbol with DW_AT_external and a
18900 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
18901 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
18902 with some versions of binutils) where shared libraries could have
18903 relocations against symbols in their debug information - the
18904 minimal symbol would have the right address, but the debug info
18905 would not. It's no longer necessary, because we will explicitly
18906 apply relocations when we read in the debug information now. */
18908 /* A DW_AT_location attribute with no contents indicates that a
18909 variable has been optimized away. */
18910 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
18912 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
18916 /* Handle one degenerate form of location expression specially, to
18917 preserve GDB's previous behavior when section offsets are
18918 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
18919 then mark this symbol as LOC_STATIC. */
18921 if (attr_form_is_block (attr)
18922 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
18923 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
18924 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
18925 && (DW_BLOCK (attr)->size
18926 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
18928 unsigned int dummy;
18930 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
18931 SYMBOL_VALUE_ADDRESS (sym) =
18932 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
18934 SYMBOL_VALUE_ADDRESS (sym) =
18935 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
18936 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
18937 fixup_symbol_section (sym, objfile);
18938 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
18939 SYMBOL_SECTION (sym));
18943 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
18944 expression evaluator, and use LOC_COMPUTED only when necessary
18945 (i.e. when the value of a register or memory location is
18946 referenced, or a thread-local block, etc.). Then again, it might
18947 not be worthwhile. I'm assuming that it isn't unless performance
18948 or memory numbers show me otherwise. */
18950 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
18952 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
18953 cu->has_loclist = 1;
18956 /* Given a pointer to a DWARF information entry, figure out if we need
18957 to make a symbol table entry for it, and if so, create a new entry
18958 and return a pointer to it.
18959 If TYPE is NULL, determine symbol type from the die, otherwise
18960 used the passed type.
18961 If SPACE is not NULL, use it to hold the new symbol. If it is
18962 NULL, allocate a new symbol on the objfile's obstack. */
18964 static struct symbol *
18965 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
18966 struct symbol *space)
18968 struct objfile *objfile = cu->objfile;
18969 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18970 struct symbol *sym = NULL;
18972 struct attribute *attr = NULL;
18973 struct attribute *attr2 = NULL;
18974 CORE_ADDR baseaddr;
18975 struct pending **list_to_add = NULL;
18977 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
18979 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
18981 name = dwarf2_name (die, cu);
18984 const char *linkagename;
18985 int suppress_add = 0;
18990 sym = allocate_symbol (objfile);
18991 OBJSTAT (objfile, n_syms++);
18993 /* Cache this symbol's name and the name's demangled form (if any). */
18994 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
18995 linkagename = dwarf2_physname (name, die, cu);
18996 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
18998 /* Fortran does not have mangling standard and the mangling does differ
18999 between gfortran, iFort etc. */
19000 if (cu->language == language_fortran
19001 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
19002 symbol_set_demangled_name (&(sym->ginfo),
19003 dwarf2_full_name (name, die, cu),
19006 /* Default assumptions.
19007 Use the passed type or decode it from the die. */
19008 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19009 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
19011 SYMBOL_TYPE (sym) = type;
19013 SYMBOL_TYPE (sym) = die_type (die, cu);
19014 attr = dwarf2_attr (die,
19015 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
19019 SYMBOL_LINE (sym) = DW_UNSND (attr);
19022 attr = dwarf2_attr (die,
19023 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
19027 file_name_index file_index = (file_name_index) DW_UNSND (attr);
19028 struct file_entry *fe;
19030 if (cu->line_header != NULL)
19031 fe = cu->line_header->file_name_at (file_index);
19036 complaint (&symfile_complaints,
19037 _("file index out of range"));
19039 symbol_set_symtab (sym, fe->symtab);
19045 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
19050 addr = attr_value_as_address (attr);
19051 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
19052 SYMBOL_VALUE_ADDRESS (sym) = addr;
19054 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
19055 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
19056 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
19057 add_symbol_to_list (sym, cu->list_in_scope);
19059 case DW_TAG_subprogram:
19060 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
19062 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
19063 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19064 if ((attr2 && (DW_UNSND (attr2) != 0))
19065 || cu->language == language_ada)
19067 /* Subprograms marked external are stored as a global symbol.
19068 Ada subprograms, whether marked external or not, are always
19069 stored as a global symbol, because we want to be able to
19070 access them globally. For instance, we want to be able
19071 to break on a nested subprogram without having to
19072 specify the context. */
19073 list_to_add = &global_symbols;
19077 list_to_add = cu->list_in_scope;
19080 case DW_TAG_inlined_subroutine:
19081 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
19083 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
19084 SYMBOL_INLINED (sym) = 1;
19085 list_to_add = cu->list_in_scope;
19087 case DW_TAG_template_value_param:
19089 /* Fall through. */
19090 case DW_TAG_constant:
19091 case DW_TAG_variable:
19092 case DW_TAG_member:
19093 /* Compilation with minimal debug info may result in
19094 variables with missing type entries. Change the
19095 misleading `void' type to something sensible. */
19096 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
19098 = objfile_type (objfile)->nodebug_data_symbol;
19100 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19101 /* In the case of DW_TAG_member, we should only be called for
19102 static const members. */
19103 if (die->tag == DW_TAG_member)
19105 /* dwarf2_add_field uses die_is_declaration,
19106 so we do the same. */
19107 gdb_assert (die_is_declaration (die, cu));
19112 dwarf2_const_value (attr, sym, cu);
19113 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19116 if (attr2 && (DW_UNSND (attr2) != 0))
19117 list_to_add = &global_symbols;
19119 list_to_add = cu->list_in_scope;
19123 attr = dwarf2_attr (die, DW_AT_location, cu);
19126 var_decode_location (attr, sym, cu);
19127 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19129 /* Fortran explicitly imports any global symbols to the local
19130 scope by DW_TAG_common_block. */
19131 if (cu->language == language_fortran && die->parent
19132 && die->parent->tag == DW_TAG_common_block)
19135 if (SYMBOL_CLASS (sym) == LOC_STATIC
19136 && SYMBOL_VALUE_ADDRESS (sym) == 0
19137 && !dwarf2_per_objfile->has_section_at_zero)
19139 /* When a static variable is eliminated by the linker,
19140 the corresponding debug information is not stripped
19141 out, but the variable address is set to null;
19142 do not add such variables into symbol table. */
19144 else if (attr2 && (DW_UNSND (attr2) != 0))
19146 /* Workaround gfortran PR debug/40040 - it uses
19147 DW_AT_location for variables in -fPIC libraries which may
19148 get overriden by other libraries/executable and get
19149 a different address. Resolve it by the minimal symbol
19150 which may come from inferior's executable using copy
19151 relocation. Make this workaround only for gfortran as for
19152 other compilers GDB cannot guess the minimal symbol
19153 Fortran mangling kind. */
19154 if (cu->language == language_fortran && die->parent
19155 && die->parent->tag == DW_TAG_module
19157 && startswith (cu->producer, "GNU Fortran"))
19158 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19160 /* A variable with DW_AT_external is never static,
19161 but it may be block-scoped. */
19162 list_to_add = (cu->list_in_scope == &file_symbols
19163 ? &global_symbols : cu->list_in_scope);
19166 list_to_add = cu->list_in_scope;
19170 /* We do not know the address of this symbol.
19171 If it is an external symbol and we have type information
19172 for it, enter the symbol as a LOC_UNRESOLVED symbol.
19173 The address of the variable will then be determined from
19174 the minimal symbol table whenever the variable is
19176 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19178 /* Fortran explicitly imports any global symbols to the local
19179 scope by DW_TAG_common_block. */
19180 if (cu->language == language_fortran && die->parent
19181 && die->parent->tag == DW_TAG_common_block)
19183 /* SYMBOL_CLASS doesn't matter here because
19184 read_common_block is going to reset it. */
19186 list_to_add = cu->list_in_scope;
19188 else if (attr2 && (DW_UNSND (attr2) != 0)
19189 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
19191 /* A variable with DW_AT_external is never static, but it
19192 may be block-scoped. */
19193 list_to_add = (cu->list_in_scope == &file_symbols
19194 ? &global_symbols : cu->list_in_scope);
19196 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19198 else if (!die_is_declaration (die, cu))
19200 /* Use the default LOC_OPTIMIZED_OUT class. */
19201 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
19203 list_to_add = cu->list_in_scope;
19207 case DW_TAG_formal_parameter:
19208 /* If we are inside a function, mark this as an argument. If
19209 not, we might be looking at an argument to an inlined function
19210 when we do not have enough information to show inlined frames;
19211 pretend it's a local variable in that case so that the user can
19213 if (context_stack_depth > 0
19214 && context_stack[context_stack_depth - 1].name != NULL)
19215 SYMBOL_IS_ARGUMENT (sym) = 1;
19216 attr = dwarf2_attr (die, DW_AT_location, cu);
19219 var_decode_location (attr, sym, cu);
19221 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19224 dwarf2_const_value (attr, sym, cu);
19227 list_to_add = cu->list_in_scope;
19229 case DW_TAG_unspecified_parameters:
19230 /* From varargs functions; gdb doesn't seem to have any
19231 interest in this information, so just ignore it for now.
19234 case DW_TAG_template_type_param:
19236 /* Fall through. */
19237 case DW_TAG_class_type:
19238 case DW_TAG_interface_type:
19239 case DW_TAG_structure_type:
19240 case DW_TAG_union_type:
19241 case DW_TAG_set_type:
19242 case DW_TAG_enumeration_type:
19243 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19244 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
19247 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
19248 really ever be static objects: otherwise, if you try
19249 to, say, break of a class's method and you're in a file
19250 which doesn't mention that class, it won't work unless
19251 the check for all static symbols in lookup_symbol_aux
19252 saves you. See the OtherFileClass tests in
19253 gdb.c++/namespace.exp. */
19257 list_to_add = (cu->list_in_scope == &file_symbols
19258 && cu->language == language_cplus
19259 ? &global_symbols : cu->list_in_scope);
19261 /* The semantics of C++ state that "struct foo {
19262 ... }" also defines a typedef for "foo". */
19263 if (cu->language == language_cplus
19264 || cu->language == language_ada
19265 || cu->language == language_d
19266 || cu->language == language_rust)
19268 /* The symbol's name is already allocated along
19269 with this objfile, so we don't need to
19270 duplicate it for the type. */
19271 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
19272 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
19277 case DW_TAG_typedef:
19278 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19279 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19280 list_to_add = cu->list_in_scope;
19282 case DW_TAG_base_type:
19283 case DW_TAG_subrange_type:
19284 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19285 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19286 list_to_add = cu->list_in_scope;
19288 case DW_TAG_enumerator:
19289 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19292 dwarf2_const_value (attr, sym, cu);
19295 /* NOTE: carlton/2003-11-10: See comment above in the
19296 DW_TAG_class_type, etc. block. */
19298 list_to_add = (cu->list_in_scope == &file_symbols
19299 && cu->language == language_cplus
19300 ? &global_symbols : cu->list_in_scope);
19303 case DW_TAG_imported_declaration:
19304 case DW_TAG_namespace:
19305 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19306 list_to_add = &global_symbols;
19308 case DW_TAG_module:
19309 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19310 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
19311 list_to_add = &global_symbols;
19313 case DW_TAG_common_block:
19314 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
19315 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
19316 add_symbol_to_list (sym, cu->list_in_scope);
19319 /* Not a tag we recognize. Hopefully we aren't processing
19320 trash data, but since we must specifically ignore things
19321 we don't recognize, there is nothing else we should do at
19323 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
19324 dwarf_tag_name (die->tag));
19330 sym->hash_next = objfile->template_symbols;
19331 objfile->template_symbols = sym;
19332 list_to_add = NULL;
19335 if (list_to_add != NULL)
19336 add_symbol_to_list (sym, list_to_add);
19338 /* For the benefit of old versions of GCC, check for anonymous
19339 namespaces based on the demangled name. */
19340 if (!cu->processing_has_namespace_info
19341 && cu->language == language_cplus)
19342 cp_scan_for_anonymous_namespaces (sym, objfile);
19347 /* A wrapper for new_symbol_full that always allocates a new symbol. */
19349 static struct symbol *
19350 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
19352 return new_symbol_full (die, type, cu, NULL);
19355 /* Given an attr with a DW_FORM_dataN value in host byte order,
19356 zero-extend it as appropriate for the symbol's type. The DWARF
19357 standard (v4) is not entirely clear about the meaning of using
19358 DW_FORM_dataN for a constant with a signed type, where the type is
19359 wider than the data. The conclusion of a discussion on the DWARF
19360 list was that this is unspecified. We choose to always zero-extend
19361 because that is the interpretation long in use by GCC. */
19364 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
19365 struct dwarf2_cu *cu, LONGEST *value, int bits)
19367 struct objfile *objfile = cu->objfile;
19368 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
19369 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
19370 LONGEST l = DW_UNSND (attr);
19372 if (bits < sizeof (*value) * 8)
19374 l &= ((LONGEST) 1 << bits) - 1;
19377 else if (bits == sizeof (*value) * 8)
19381 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
19382 store_unsigned_integer (bytes, bits / 8, byte_order, l);
19389 /* Read a constant value from an attribute. Either set *VALUE, or if
19390 the value does not fit in *VALUE, set *BYTES - either already
19391 allocated on the objfile obstack, or newly allocated on OBSTACK,
19392 or, set *BATON, if we translated the constant to a location
19396 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
19397 const char *name, struct obstack *obstack,
19398 struct dwarf2_cu *cu,
19399 LONGEST *value, const gdb_byte **bytes,
19400 struct dwarf2_locexpr_baton **baton)
19402 struct objfile *objfile = cu->objfile;
19403 struct comp_unit_head *cu_header = &cu->header;
19404 struct dwarf_block *blk;
19405 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
19406 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
19412 switch (attr->form)
19415 case DW_FORM_GNU_addr_index:
19419 if (TYPE_LENGTH (type) != cu_header->addr_size)
19420 dwarf2_const_value_length_mismatch_complaint (name,
19421 cu_header->addr_size,
19422 TYPE_LENGTH (type));
19423 /* Symbols of this form are reasonably rare, so we just
19424 piggyback on the existing location code rather than writing
19425 a new implementation of symbol_computed_ops. */
19426 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
19427 (*baton)->per_cu = cu->per_cu;
19428 gdb_assert ((*baton)->per_cu);
19430 (*baton)->size = 2 + cu_header->addr_size;
19431 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
19432 (*baton)->data = data;
19434 data[0] = DW_OP_addr;
19435 store_unsigned_integer (&data[1], cu_header->addr_size,
19436 byte_order, DW_ADDR (attr));
19437 data[cu_header->addr_size + 1] = DW_OP_stack_value;
19440 case DW_FORM_string:
19442 case DW_FORM_GNU_str_index:
19443 case DW_FORM_GNU_strp_alt:
19444 /* DW_STRING is already allocated on the objfile obstack, point
19446 *bytes = (const gdb_byte *) DW_STRING (attr);
19448 case DW_FORM_block1:
19449 case DW_FORM_block2:
19450 case DW_FORM_block4:
19451 case DW_FORM_block:
19452 case DW_FORM_exprloc:
19453 case DW_FORM_data16:
19454 blk = DW_BLOCK (attr);
19455 if (TYPE_LENGTH (type) != blk->size)
19456 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
19457 TYPE_LENGTH (type));
19458 *bytes = blk->data;
19461 /* The DW_AT_const_value attributes are supposed to carry the
19462 symbol's value "represented as it would be on the target
19463 architecture." By the time we get here, it's already been
19464 converted to host endianness, so we just need to sign- or
19465 zero-extend it as appropriate. */
19466 case DW_FORM_data1:
19467 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
19469 case DW_FORM_data2:
19470 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
19472 case DW_FORM_data4:
19473 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
19475 case DW_FORM_data8:
19476 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
19479 case DW_FORM_sdata:
19480 *value = DW_SND (attr);
19483 case DW_FORM_udata:
19484 *value = DW_UNSND (attr);
19488 complaint (&symfile_complaints,
19489 _("unsupported const value attribute form: '%s'"),
19490 dwarf_form_name (attr->form));
19497 /* Copy constant value from an attribute to a symbol. */
19500 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
19501 struct dwarf2_cu *cu)
19503 struct objfile *objfile = cu->objfile;
19505 const gdb_byte *bytes;
19506 struct dwarf2_locexpr_baton *baton;
19508 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
19509 SYMBOL_PRINT_NAME (sym),
19510 &objfile->objfile_obstack, cu,
19511 &value, &bytes, &baton);
19515 SYMBOL_LOCATION_BATON (sym) = baton;
19516 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
19518 else if (bytes != NULL)
19520 SYMBOL_VALUE_BYTES (sym) = bytes;
19521 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
19525 SYMBOL_VALUE (sym) = value;
19526 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
19530 /* Return the type of the die in question using its DW_AT_type attribute. */
19532 static struct type *
19533 die_type (struct die_info *die, struct dwarf2_cu *cu)
19535 struct attribute *type_attr;
19537 type_attr = dwarf2_attr (die, DW_AT_type, cu);
19540 /* A missing DW_AT_type represents a void type. */
19541 return objfile_type (cu->objfile)->builtin_void;
19544 return lookup_die_type (die, type_attr, cu);
19547 /* True iff CU's producer generates GNAT Ada auxiliary information
19548 that allows to find parallel types through that information instead
19549 of having to do expensive parallel lookups by type name. */
19552 need_gnat_info (struct dwarf2_cu *cu)
19554 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
19555 of GNAT produces this auxiliary information, without any indication
19556 that it is produced. Part of enhancing the FSF version of GNAT
19557 to produce that information will be to put in place an indicator
19558 that we can use in order to determine whether the descriptive type
19559 info is available or not. One suggestion that has been made is
19560 to use a new attribute, attached to the CU die. For now, assume
19561 that the descriptive type info is not available. */
19565 /* Return the auxiliary type of the die in question using its
19566 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
19567 attribute is not present. */
19569 static struct type *
19570 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
19572 struct attribute *type_attr;
19574 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
19578 return lookup_die_type (die, type_attr, cu);
19581 /* If DIE has a descriptive_type attribute, then set the TYPE's
19582 descriptive type accordingly. */
19585 set_descriptive_type (struct type *type, struct die_info *die,
19586 struct dwarf2_cu *cu)
19588 struct type *descriptive_type = die_descriptive_type (die, cu);
19590 if (descriptive_type)
19592 ALLOCATE_GNAT_AUX_TYPE (type);
19593 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
19597 /* Return the containing type of the die in question using its
19598 DW_AT_containing_type attribute. */
19600 static struct type *
19601 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
19603 struct attribute *type_attr;
19605 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
19607 error (_("Dwarf Error: Problem turning containing type into gdb type "
19608 "[in module %s]"), objfile_name (cu->objfile));
19610 return lookup_die_type (die, type_attr, cu);
19613 /* Return an error marker type to use for the ill formed type in DIE/CU. */
19615 static struct type *
19616 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
19618 struct objfile *objfile = dwarf2_per_objfile->objfile;
19619 char *message, *saved;
19621 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
19622 objfile_name (objfile),
19623 to_underlying (cu->header.sect_off),
19624 to_underlying (die->sect_off));
19625 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
19626 message, strlen (message));
19629 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
19632 /* Look up the type of DIE in CU using its type attribute ATTR.
19633 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
19634 DW_AT_containing_type.
19635 If there is no type substitute an error marker. */
19637 static struct type *
19638 lookup_die_type (struct die_info *die, const struct attribute *attr,
19639 struct dwarf2_cu *cu)
19641 struct objfile *objfile = cu->objfile;
19642 struct type *this_type;
19644 gdb_assert (attr->name == DW_AT_type
19645 || attr->name == DW_AT_GNAT_descriptive_type
19646 || attr->name == DW_AT_containing_type);
19648 /* First see if we have it cached. */
19650 if (attr->form == DW_FORM_GNU_ref_alt)
19652 struct dwarf2_per_cu_data *per_cu;
19653 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
19655 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1, cu->objfile);
19656 this_type = get_die_type_at_offset (sect_off, per_cu);
19658 else if (attr_form_is_ref (attr))
19660 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
19662 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
19664 else if (attr->form == DW_FORM_ref_sig8)
19666 ULONGEST signature = DW_SIGNATURE (attr);
19668 return get_signatured_type (die, signature, cu);
19672 complaint (&symfile_complaints,
19673 _("Dwarf Error: Bad type attribute %s in DIE"
19674 " at 0x%x [in module %s]"),
19675 dwarf_attr_name (attr->name), to_underlying (die->sect_off),
19676 objfile_name (objfile));
19677 return build_error_marker_type (cu, die);
19680 /* If not cached we need to read it in. */
19682 if (this_type == NULL)
19684 struct die_info *type_die = NULL;
19685 struct dwarf2_cu *type_cu = cu;
19687 if (attr_form_is_ref (attr))
19688 type_die = follow_die_ref (die, attr, &type_cu);
19689 if (type_die == NULL)
19690 return build_error_marker_type (cu, die);
19691 /* If we find the type now, it's probably because the type came
19692 from an inter-CU reference and the type's CU got expanded before
19694 this_type = read_type_die (type_die, type_cu);
19697 /* If we still don't have a type use an error marker. */
19699 if (this_type == NULL)
19700 return build_error_marker_type (cu, die);
19705 /* Return the type in DIE, CU.
19706 Returns NULL for invalid types.
19708 This first does a lookup in die_type_hash,
19709 and only reads the die in if necessary.
19711 NOTE: This can be called when reading in partial or full symbols. */
19713 static struct type *
19714 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
19716 struct type *this_type;
19718 this_type = get_die_type (die, cu);
19722 return read_type_die_1 (die, cu);
19725 /* Read the type in DIE, CU.
19726 Returns NULL for invalid types. */
19728 static struct type *
19729 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
19731 struct type *this_type = NULL;
19735 case DW_TAG_class_type:
19736 case DW_TAG_interface_type:
19737 case DW_TAG_structure_type:
19738 case DW_TAG_union_type:
19739 this_type = read_structure_type (die, cu);
19741 case DW_TAG_enumeration_type:
19742 this_type = read_enumeration_type (die, cu);
19744 case DW_TAG_subprogram:
19745 case DW_TAG_subroutine_type:
19746 case DW_TAG_inlined_subroutine:
19747 this_type = read_subroutine_type (die, cu);
19749 case DW_TAG_array_type:
19750 this_type = read_array_type (die, cu);
19752 case DW_TAG_set_type:
19753 this_type = read_set_type (die, cu);
19755 case DW_TAG_pointer_type:
19756 this_type = read_tag_pointer_type (die, cu);
19758 case DW_TAG_ptr_to_member_type:
19759 this_type = read_tag_ptr_to_member_type (die, cu);
19761 case DW_TAG_reference_type:
19762 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
19764 case DW_TAG_rvalue_reference_type:
19765 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
19767 case DW_TAG_const_type:
19768 this_type = read_tag_const_type (die, cu);
19770 case DW_TAG_volatile_type:
19771 this_type = read_tag_volatile_type (die, cu);
19773 case DW_TAG_restrict_type:
19774 this_type = read_tag_restrict_type (die, cu);
19776 case DW_TAG_string_type:
19777 this_type = read_tag_string_type (die, cu);
19779 case DW_TAG_typedef:
19780 this_type = read_typedef (die, cu);
19782 case DW_TAG_subrange_type:
19783 this_type = read_subrange_type (die, cu);
19785 case DW_TAG_base_type:
19786 this_type = read_base_type (die, cu);
19788 case DW_TAG_unspecified_type:
19789 this_type = read_unspecified_type (die, cu);
19791 case DW_TAG_namespace:
19792 this_type = read_namespace_type (die, cu);
19794 case DW_TAG_module:
19795 this_type = read_module_type (die, cu);
19797 case DW_TAG_atomic_type:
19798 this_type = read_tag_atomic_type (die, cu);
19801 complaint (&symfile_complaints,
19802 _("unexpected tag in read_type_die: '%s'"),
19803 dwarf_tag_name (die->tag));
19810 /* See if we can figure out if the class lives in a namespace. We do
19811 this by looking for a member function; its demangled name will
19812 contain namespace info, if there is any.
19813 Return the computed name or NULL.
19814 Space for the result is allocated on the objfile's obstack.
19815 This is the full-die version of guess_partial_die_structure_name.
19816 In this case we know DIE has no useful parent. */
19819 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
19821 struct die_info *spec_die;
19822 struct dwarf2_cu *spec_cu;
19823 struct die_info *child;
19826 spec_die = die_specification (die, &spec_cu);
19827 if (spec_die != NULL)
19833 for (child = die->child;
19835 child = child->sibling)
19837 if (child->tag == DW_TAG_subprogram)
19839 const char *linkage_name;
19841 linkage_name = dwarf2_string_attr (child, DW_AT_linkage_name, cu);
19842 if (linkage_name == NULL)
19843 linkage_name = dwarf2_string_attr (child, DW_AT_MIPS_linkage_name,
19845 if (linkage_name != NULL)
19848 = language_class_name_from_physname (cu->language_defn,
19852 if (actual_name != NULL)
19854 const char *die_name = dwarf2_name (die, cu);
19856 if (die_name != NULL
19857 && strcmp (die_name, actual_name) != 0)
19859 /* Strip off the class name from the full name.
19860 We want the prefix. */
19861 int die_name_len = strlen (die_name);
19862 int actual_name_len = strlen (actual_name);
19864 /* Test for '::' as a sanity check. */
19865 if (actual_name_len > die_name_len + 2
19866 && actual_name[actual_name_len
19867 - die_name_len - 1] == ':')
19868 name = (char *) obstack_copy0 (
19869 &cu->objfile->per_bfd->storage_obstack,
19870 actual_name, actual_name_len - die_name_len - 2);
19873 xfree (actual_name);
19882 /* GCC might emit a nameless typedef that has a linkage name. Determine the
19883 prefix part in such case. See
19884 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19886 static const char *
19887 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
19889 struct attribute *attr;
19892 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
19893 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
19896 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
19899 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
19901 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
19902 if (attr == NULL || DW_STRING (attr) == NULL)
19905 /* dwarf2_name had to be already called. */
19906 gdb_assert (DW_STRING_IS_CANONICAL (attr));
19908 /* Strip the base name, keep any leading namespaces/classes. */
19909 base = strrchr (DW_STRING (attr), ':');
19910 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
19913 return (char *) obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
19915 &base[-1] - DW_STRING (attr));
19918 /* Return the name of the namespace/class that DIE is defined within,
19919 or "" if we can't tell. The caller should not xfree the result.
19921 For example, if we're within the method foo() in the following
19931 then determine_prefix on foo's die will return "N::C". */
19933 static const char *
19934 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
19936 struct die_info *parent, *spec_die;
19937 struct dwarf2_cu *spec_cu;
19938 struct type *parent_type;
19939 const char *retval;
19941 if (cu->language != language_cplus
19942 && cu->language != language_fortran && cu->language != language_d
19943 && cu->language != language_rust)
19946 retval = anonymous_struct_prefix (die, cu);
19950 /* We have to be careful in the presence of DW_AT_specification.
19951 For example, with GCC 3.4, given the code
19955 // Definition of N::foo.
19959 then we'll have a tree of DIEs like this:
19961 1: DW_TAG_compile_unit
19962 2: DW_TAG_namespace // N
19963 3: DW_TAG_subprogram // declaration of N::foo
19964 4: DW_TAG_subprogram // definition of N::foo
19965 DW_AT_specification // refers to die #3
19967 Thus, when processing die #4, we have to pretend that we're in
19968 the context of its DW_AT_specification, namely the contex of die
19971 spec_die = die_specification (die, &spec_cu);
19972 if (spec_die == NULL)
19973 parent = die->parent;
19976 parent = spec_die->parent;
19980 if (parent == NULL)
19982 else if (parent->building_fullname)
19985 const char *parent_name;
19987 /* It has been seen on RealView 2.2 built binaries,
19988 DW_TAG_template_type_param types actually _defined_ as
19989 children of the parent class:
19992 template class <class Enum> Class{};
19993 Class<enum E> class_e;
19995 1: DW_TAG_class_type (Class)
19996 2: DW_TAG_enumeration_type (E)
19997 3: DW_TAG_enumerator (enum1:0)
19998 3: DW_TAG_enumerator (enum2:1)
20000 2: DW_TAG_template_type_param
20001 DW_AT_type DW_FORM_ref_udata (E)
20003 Besides being broken debug info, it can put GDB into an
20004 infinite loop. Consider:
20006 When we're building the full name for Class<E>, we'll start
20007 at Class, and go look over its template type parameters,
20008 finding E. We'll then try to build the full name of E, and
20009 reach here. We're now trying to build the full name of E,
20010 and look over the parent DIE for containing scope. In the
20011 broken case, if we followed the parent DIE of E, we'd again
20012 find Class, and once again go look at its template type
20013 arguments, etc., etc. Simply don't consider such parent die
20014 as source-level parent of this die (it can't be, the language
20015 doesn't allow it), and break the loop here. */
20016 name = dwarf2_name (die, cu);
20017 parent_name = dwarf2_name (parent, cu);
20018 complaint (&symfile_complaints,
20019 _("template param type '%s' defined within parent '%s'"),
20020 name ? name : "<unknown>",
20021 parent_name ? parent_name : "<unknown>");
20025 switch (parent->tag)
20027 case DW_TAG_namespace:
20028 parent_type = read_type_die (parent, cu);
20029 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
20030 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
20031 Work around this problem here. */
20032 if (cu->language == language_cplus
20033 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
20035 /* We give a name to even anonymous namespaces. */
20036 return TYPE_TAG_NAME (parent_type);
20037 case DW_TAG_class_type:
20038 case DW_TAG_interface_type:
20039 case DW_TAG_structure_type:
20040 case DW_TAG_union_type:
20041 case DW_TAG_module:
20042 parent_type = read_type_die (parent, cu);
20043 if (TYPE_TAG_NAME (parent_type) != NULL)
20044 return TYPE_TAG_NAME (parent_type);
20046 /* An anonymous structure is only allowed non-static data
20047 members; no typedefs, no member functions, et cetera.
20048 So it does not need a prefix. */
20050 case DW_TAG_compile_unit:
20051 case DW_TAG_partial_unit:
20052 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
20053 if (cu->language == language_cplus
20054 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
20055 && die->child != NULL
20056 && (die->tag == DW_TAG_class_type
20057 || die->tag == DW_TAG_structure_type
20058 || die->tag == DW_TAG_union_type))
20060 char *name = guess_full_die_structure_name (die, cu);
20065 case DW_TAG_enumeration_type:
20066 parent_type = read_type_die (parent, cu);
20067 if (TYPE_DECLARED_CLASS (parent_type))
20069 if (TYPE_TAG_NAME (parent_type) != NULL)
20070 return TYPE_TAG_NAME (parent_type);
20073 /* Fall through. */
20075 return determine_prefix (parent, cu);
20079 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
20080 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
20081 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
20082 an obconcat, otherwise allocate storage for the result. The CU argument is
20083 used to determine the language and hence, the appropriate separator. */
20085 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
20088 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
20089 int physname, struct dwarf2_cu *cu)
20091 const char *lead = "";
20094 if (suffix == NULL || suffix[0] == '\0'
20095 || prefix == NULL || prefix[0] == '\0')
20097 else if (cu->language == language_d)
20099 /* For D, the 'main' function could be defined in any module, but it
20100 should never be prefixed. */
20101 if (strcmp (suffix, "D main") == 0)
20109 else if (cu->language == language_fortran && physname)
20111 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
20112 DW_AT_MIPS_linkage_name is preferred and used instead. */
20120 if (prefix == NULL)
20122 if (suffix == NULL)
20129 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
20131 strcpy (retval, lead);
20132 strcat (retval, prefix);
20133 strcat (retval, sep);
20134 strcat (retval, suffix);
20139 /* We have an obstack. */
20140 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
20144 /* Return sibling of die, NULL if no sibling. */
20146 static struct die_info *
20147 sibling_die (struct die_info *die)
20149 return die->sibling;
20152 /* Get name of a die, return NULL if not found. */
20154 static const char *
20155 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
20156 struct obstack *obstack)
20158 if (name && cu->language == language_cplus)
20160 std::string canon_name = cp_canonicalize_string (name);
20162 if (!canon_name.empty ())
20164 if (canon_name != name)
20165 name = (const char *) obstack_copy0 (obstack,
20166 canon_name.c_str (),
20167 canon_name.length ());
20174 /* Get name of a die, return NULL if not found.
20175 Anonymous namespaces are converted to their magic string. */
20177 static const char *
20178 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
20180 struct attribute *attr;
20182 attr = dwarf2_attr (die, DW_AT_name, cu);
20183 if ((!attr || !DW_STRING (attr))
20184 && die->tag != DW_TAG_namespace
20185 && die->tag != DW_TAG_class_type
20186 && die->tag != DW_TAG_interface_type
20187 && die->tag != DW_TAG_structure_type
20188 && die->tag != DW_TAG_union_type)
20193 case DW_TAG_compile_unit:
20194 case DW_TAG_partial_unit:
20195 /* Compilation units have a DW_AT_name that is a filename, not
20196 a source language identifier. */
20197 case DW_TAG_enumeration_type:
20198 case DW_TAG_enumerator:
20199 /* These tags always have simple identifiers already; no need
20200 to canonicalize them. */
20201 return DW_STRING (attr);
20203 case DW_TAG_namespace:
20204 if (attr != NULL && DW_STRING (attr) != NULL)
20205 return DW_STRING (attr);
20206 return CP_ANONYMOUS_NAMESPACE_STR;
20208 case DW_TAG_class_type:
20209 case DW_TAG_interface_type:
20210 case DW_TAG_structure_type:
20211 case DW_TAG_union_type:
20212 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
20213 structures or unions. These were of the form "._%d" in GCC 4.1,
20214 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
20215 and GCC 4.4. We work around this problem by ignoring these. */
20216 if (attr && DW_STRING (attr)
20217 && (startswith (DW_STRING (attr), "._")
20218 || startswith (DW_STRING (attr), "<anonymous")))
20221 /* GCC might emit a nameless typedef that has a linkage name. See
20222 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
20223 if (!attr || DW_STRING (attr) == NULL)
20225 char *demangled = NULL;
20227 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
20229 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
20231 if (attr == NULL || DW_STRING (attr) == NULL)
20234 /* Avoid demangling DW_STRING (attr) the second time on a second
20235 call for the same DIE. */
20236 if (!DW_STRING_IS_CANONICAL (attr))
20237 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
20243 /* FIXME: we already did this for the partial symbol... */
20246 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
20247 demangled, strlen (demangled)));
20248 DW_STRING_IS_CANONICAL (attr) = 1;
20251 /* Strip any leading namespaces/classes, keep only the base name.
20252 DW_AT_name for named DIEs does not contain the prefixes. */
20253 base = strrchr (DW_STRING (attr), ':');
20254 if (base && base > DW_STRING (attr) && base[-1] == ':')
20257 return DW_STRING (attr);
20266 if (!DW_STRING_IS_CANONICAL (attr))
20269 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
20270 &cu->objfile->per_bfd->storage_obstack);
20271 DW_STRING_IS_CANONICAL (attr) = 1;
20273 return DW_STRING (attr);
20276 /* Return the die that this die in an extension of, or NULL if there
20277 is none. *EXT_CU is the CU containing DIE on input, and the CU
20278 containing the return value on output. */
20280 static struct die_info *
20281 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
20283 struct attribute *attr;
20285 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
20289 return follow_die_ref (die, attr, ext_cu);
20292 /* Convert a DIE tag into its string name. */
20294 static const char *
20295 dwarf_tag_name (unsigned tag)
20297 const char *name = get_DW_TAG_name (tag);
20300 return "DW_TAG_<unknown>";
20305 /* Convert a DWARF attribute code into its string name. */
20307 static const char *
20308 dwarf_attr_name (unsigned attr)
20312 #ifdef MIPS /* collides with DW_AT_HP_block_index */
20313 if (attr == DW_AT_MIPS_fde)
20314 return "DW_AT_MIPS_fde";
20316 if (attr == DW_AT_HP_block_index)
20317 return "DW_AT_HP_block_index";
20320 name = get_DW_AT_name (attr);
20323 return "DW_AT_<unknown>";
20328 /* Convert a DWARF value form code into its string name. */
20330 static const char *
20331 dwarf_form_name (unsigned form)
20333 const char *name = get_DW_FORM_name (form);
20336 return "DW_FORM_<unknown>";
20341 static const char *
20342 dwarf_bool_name (unsigned mybool)
20350 /* Convert a DWARF type code into its string name. */
20352 static const char *
20353 dwarf_type_encoding_name (unsigned enc)
20355 const char *name = get_DW_ATE_name (enc);
20358 return "DW_ATE_<unknown>";
20364 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
20368 print_spaces (indent, f);
20369 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
20370 dwarf_tag_name (die->tag), die->abbrev,
20371 to_underlying (die->sect_off));
20373 if (die->parent != NULL)
20375 print_spaces (indent, f);
20376 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
20377 to_underlying (die->parent->sect_off));
20380 print_spaces (indent, f);
20381 fprintf_unfiltered (f, " has children: %s\n",
20382 dwarf_bool_name (die->child != NULL));
20384 print_spaces (indent, f);
20385 fprintf_unfiltered (f, " attributes:\n");
20387 for (i = 0; i < die->num_attrs; ++i)
20389 print_spaces (indent, f);
20390 fprintf_unfiltered (f, " %s (%s) ",
20391 dwarf_attr_name (die->attrs[i].name),
20392 dwarf_form_name (die->attrs[i].form));
20394 switch (die->attrs[i].form)
20397 case DW_FORM_GNU_addr_index:
20398 fprintf_unfiltered (f, "address: ");
20399 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
20401 case DW_FORM_block2:
20402 case DW_FORM_block4:
20403 case DW_FORM_block:
20404 case DW_FORM_block1:
20405 fprintf_unfiltered (f, "block: size %s",
20406 pulongest (DW_BLOCK (&die->attrs[i])->size));
20408 case DW_FORM_exprloc:
20409 fprintf_unfiltered (f, "expression: size %s",
20410 pulongest (DW_BLOCK (&die->attrs[i])->size));
20412 case DW_FORM_data16:
20413 fprintf_unfiltered (f, "constant of 16 bytes");
20415 case DW_FORM_ref_addr:
20416 fprintf_unfiltered (f, "ref address: ");
20417 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
20419 case DW_FORM_GNU_ref_alt:
20420 fprintf_unfiltered (f, "alt ref address: ");
20421 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
20427 case DW_FORM_ref_udata:
20428 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
20429 (long) (DW_UNSND (&die->attrs[i])));
20431 case DW_FORM_data1:
20432 case DW_FORM_data2:
20433 case DW_FORM_data4:
20434 case DW_FORM_data8:
20435 case DW_FORM_udata:
20436 case DW_FORM_sdata:
20437 fprintf_unfiltered (f, "constant: %s",
20438 pulongest (DW_UNSND (&die->attrs[i])));
20440 case DW_FORM_sec_offset:
20441 fprintf_unfiltered (f, "section offset: %s",
20442 pulongest (DW_UNSND (&die->attrs[i])));
20444 case DW_FORM_ref_sig8:
20445 fprintf_unfiltered (f, "signature: %s",
20446 hex_string (DW_SIGNATURE (&die->attrs[i])));
20448 case DW_FORM_string:
20450 case DW_FORM_line_strp:
20451 case DW_FORM_GNU_str_index:
20452 case DW_FORM_GNU_strp_alt:
20453 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
20454 DW_STRING (&die->attrs[i])
20455 ? DW_STRING (&die->attrs[i]) : "",
20456 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
20459 if (DW_UNSND (&die->attrs[i]))
20460 fprintf_unfiltered (f, "flag: TRUE");
20462 fprintf_unfiltered (f, "flag: FALSE");
20464 case DW_FORM_flag_present:
20465 fprintf_unfiltered (f, "flag: TRUE");
20467 case DW_FORM_indirect:
20468 /* The reader will have reduced the indirect form to
20469 the "base form" so this form should not occur. */
20470 fprintf_unfiltered (f,
20471 "unexpected attribute form: DW_FORM_indirect");
20474 fprintf_unfiltered (f, "unsupported attribute form: %d.",
20475 die->attrs[i].form);
20478 fprintf_unfiltered (f, "\n");
20483 dump_die_for_error (struct die_info *die)
20485 dump_die_shallow (gdb_stderr, 0, die);
20489 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
20491 int indent = level * 4;
20493 gdb_assert (die != NULL);
20495 if (level >= max_level)
20498 dump_die_shallow (f, indent, die);
20500 if (die->child != NULL)
20502 print_spaces (indent, f);
20503 fprintf_unfiltered (f, " Children:");
20504 if (level + 1 < max_level)
20506 fprintf_unfiltered (f, "\n");
20507 dump_die_1 (f, level + 1, max_level, die->child);
20511 fprintf_unfiltered (f,
20512 " [not printed, max nesting level reached]\n");
20516 if (die->sibling != NULL && level > 0)
20518 dump_die_1 (f, level, max_level, die->sibling);
20522 /* This is called from the pdie macro in gdbinit.in.
20523 It's not static so gcc will keep a copy callable from gdb. */
20526 dump_die (struct die_info *die, int max_level)
20528 dump_die_1 (gdb_stdlog, 0, max_level, die);
20532 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
20536 slot = htab_find_slot_with_hash (cu->die_hash, die,
20537 to_underlying (die->sect_off),
20543 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
20547 dwarf2_get_ref_die_offset (const struct attribute *attr)
20549 if (attr_form_is_ref (attr))
20550 return (sect_offset) DW_UNSND (attr);
20552 complaint (&symfile_complaints,
20553 _("unsupported die ref attribute form: '%s'"),
20554 dwarf_form_name (attr->form));
20558 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
20559 * the value held by the attribute is not constant. */
20562 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
20564 if (attr->form == DW_FORM_sdata)
20565 return DW_SND (attr);
20566 else if (attr->form == DW_FORM_udata
20567 || attr->form == DW_FORM_data1
20568 || attr->form == DW_FORM_data2
20569 || attr->form == DW_FORM_data4
20570 || attr->form == DW_FORM_data8)
20571 return DW_UNSND (attr);
20574 /* For DW_FORM_data16 see attr_form_is_constant. */
20575 complaint (&symfile_complaints,
20576 _("Attribute value is not a constant (%s)"),
20577 dwarf_form_name (attr->form));
20578 return default_value;
20582 /* Follow reference or signature attribute ATTR of SRC_DIE.
20583 On entry *REF_CU is the CU of SRC_DIE.
20584 On exit *REF_CU is the CU of the result. */
20586 static struct die_info *
20587 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
20588 struct dwarf2_cu **ref_cu)
20590 struct die_info *die;
20592 if (attr_form_is_ref (attr))
20593 die = follow_die_ref (src_die, attr, ref_cu);
20594 else if (attr->form == DW_FORM_ref_sig8)
20595 die = follow_die_sig (src_die, attr, ref_cu);
20598 dump_die_for_error (src_die);
20599 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
20600 objfile_name ((*ref_cu)->objfile));
20606 /* Follow reference OFFSET.
20607 On entry *REF_CU is the CU of the source die referencing OFFSET.
20608 On exit *REF_CU is the CU of the result.
20609 Returns NULL if OFFSET is invalid. */
20611 static struct die_info *
20612 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
20613 struct dwarf2_cu **ref_cu)
20615 struct die_info temp_die;
20616 struct dwarf2_cu *target_cu, *cu = *ref_cu;
20618 gdb_assert (cu->per_cu != NULL);
20622 if (cu->per_cu->is_debug_types)
20624 /* .debug_types CUs cannot reference anything outside their CU.
20625 If they need to, they have to reference a signatured type via
20626 DW_FORM_ref_sig8. */
20627 if (!offset_in_cu_p (&cu->header, sect_off))
20630 else if (offset_in_dwz != cu->per_cu->is_dwz
20631 || !offset_in_cu_p (&cu->header, sect_off))
20633 struct dwarf2_per_cu_data *per_cu;
20635 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
20638 /* If necessary, add it to the queue and load its DIEs. */
20639 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
20640 load_full_comp_unit (per_cu, cu->language);
20642 target_cu = per_cu->cu;
20644 else if (cu->dies == NULL)
20646 /* We're loading full DIEs during partial symbol reading. */
20647 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
20648 load_full_comp_unit (cu->per_cu, language_minimal);
20651 *ref_cu = target_cu;
20652 temp_die.sect_off = sect_off;
20653 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
20655 to_underlying (sect_off));
20658 /* Follow reference attribute ATTR of SRC_DIE.
20659 On entry *REF_CU is the CU of SRC_DIE.
20660 On exit *REF_CU is the CU of the result. */
20662 static struct die_info *
20663 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
20664 struct dwarf2_cu **ref_cu)
20666 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
20667 struct dwarf2_cu *cu = *ref_cu;
20668 struct die_info *die;
20670 die = follow_die_offset (sect_off,
20671 (attr->form == DW_FORM_GNU_ref_alt
20672 || cu->per_cu->is_dwz),
20675 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
20676 "at 0x%x [in module %s]"),
20677 to_underlying (sect_off), to_underlying (src_die->sect_off),
20678 objfile_name (cu->objfile));
20683 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
20684 Returned value is intended for DW_OP_call*. Returned
20685 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
20687 struct dwarf2_locexpr_baton
20688 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
20689 struct dwarf2_per_cu_data *per_cu,
20690 CORE_ADDR (*get_frame_pc) (void *baton),
20693 struct dwarf2_cu *cu;
20694 struct die_info *die;
20695 struct attribute *attr;
20696 struct dwarf2_locexpr_baton retval;
20698 dw2_setup (per_cu->objfile);
20700 if (per_cu->cu == NULL)
20705 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20706 Instead just throw an error, not much else we can do. */
20707 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20708 to_underlying (sect_off), objfile_name (per_cu->objfile));
20711 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20713 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20714 to_underlying (sect_off), objfile_name (per_cu->objfile));
20716 attr = dwarf2_attr (die, DW_AT_location, cu);
20719 /* DWARF: "If there is no such attribute, then there is no effect.".
20720 DATA is ignored if SIZE is 0. */
20722 retval.data = NULL;
20725 else if (attr_form_is_section_offset (attr))
20727 struct dwarf2_loclist_baton loclist_baton;
20728 CORE_ADDR pc = (*get_frame_pc) (baton);
20731 fill_in_loclist_baton (cu, &loclist_baton, attr);
20733 retval.data = dwarf2_find_location_expression (&loclist_baton,
20735 retval.size = size;
20739 if (!attr_form_is_block (attr))
20740 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
20741 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
20742 to_underlying (sect_off), objfile_name (per_cu->objfile));
20744 retval.data = DW_BLOCK (attr)->data;
20745 retval.size = DW_BLOCK (attr)->size;
20747 retval.per_cu = cu->per_cu;
20749 age_cached_comp_units ();
20754 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
20757 struct dwarf2_locexpr_baton
20758 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
20759 struct dwarf2_per_cu_data *per_cu,
20760 CORE_ADDR (*get_frame_pc) (void *baton),
20763 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
20765 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
20768 /* Write a constant of a given type as target-ordered bytes into
20771 static const gdb_byte *
20772 write_constant_as_bytes (struct obstack *obstack,
20773 enum bfd_endian byte_order,
20780 *len = TYPE_LENGTH (type);
20781 result = (gdb_byte *) obstack_alloc (obstack, *len);
20782 store_unsigned_integer (result, *len, byte_order, value);
20787 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
20788 pointer to the constant bytes and set LEN to the length of the
20789 data. If memory is needed, allocate it on OBSTACK. If the DIE
20790 does not have a DW_AT_const_value, return NULL. */
20793 dwarf2_fetch_constant_bytes (sect_offset sect_off,
20794 struct dwarf2_per_cu_data *per_cu,
20795 struct obstack *obstack,
20798 struct dwarf2_cu *cu;
20799 struct die_info *die;
20800 struct attribute *attr;
20801 const gdb_byte *result = NULL;
20804 enum bfd_endian byte_order;
20806 dw2_setup (per_cu->objfile);
20808 if (per_cu->cu == NULL)
20813 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20814 Instead just throw an error, not much else we can do. */
20815 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20816 to_underlying (sect_off), objfile_name (per_cu->objfile));
20819 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20821 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20822 to_underlying (sect_off), objfile_name (per_cu->objfile));
20825 attr = dwarf2_attr (die, DW_AT_const_value, cu);
20829 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
20830 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
20832 switch (attr->form)
20835 case DW_FORM_GNU_addr_index:
20839 *len = cu->header.addr_size;
20840 tem = (gdb_byte *) obstack_alloc (obstack, *len);
20841 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
20845 case DW_FORM_string:
20847 case DW_FORM_GNU_str_index:
20848 case DW_FORM_GNU_strp_alt:
20849 /* DW_STRING is already allocated on the objfile obstack, point
20851 result = (const gdb_byte *) DW_STRING (attr);
20852 *len = strlen (DW_STRING (attr));
20854 case DW_FORM_block1:
20855 case DW_FORM_block2:
20856 case DW_FORM_block4:
20857 case DW_FORM_block:
20858 case DW_FORM_exprloc:
20859 case DW_FORM_data16:
20860 result = DW_BLOCK (attr)->data;
20861 *len = DW_BLOCK (attr)->size;
20864 /* The DW_AT_const_value attributes are supposed to carry the
20865 symbol's value "represented as it would be on the target
20866 architecture." By the time we get here, it's already been
20867 converted to host endianness, so we just need to sign- or
20868 zero-extend it as appropriate. */
20869 case DW_FORM_data1:
20870 type = die_type (die, cu);
20871 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
20872 if (result == NULL)
20873 result = write_constant_as_bytes (obstack, byte_order,
20876 case DW_FORM_data2:
20877 type = die_type (die, cu);
20878 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
20879 if (result == NULL)
20880 result = write_constant_as_bytes (obstack, byte_order,
20883 case DW_FORM_data4:
20884 type = die_type (die, cu);
20885 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
20886 if (result == NULL)
20887 result = write_constant_as_bytes (obstack, byte_order,
20890 case DW_FORM_data8:
20891 type = die_type (die, cu);
20892 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
20893 if (result == NULL)
20894 result = write_constant_as_bytes (obstack, byte_order,
20898 case DW_FORM_sdata:
20899 type = die_type (die, cu);
20900 result = write_constant_as_bytes (obstack, byte_order,
20901 type, DW_SND (attr), len);
20904 case DW_FORM_udata:
20905 type = die_type (die, cu);
20906 result = write_constant_as_bytes (obstack, byte_order,
20907 type, DW_UNSND (attr), len);
20911 complaint (&symfile_complaints,
20912 _("unsupported const value attribute form: '%s'"),
20913 dwarf_form_name (attr->form));
20920 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
20921 valid type for this die is found. */
20924 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
20925 struct dwarf2_per_cu_data *per_cu)
20927 struct dwarf2_cu *cu;
20928 struct die_info *die;
20930 dw2_setup (per_cu->objfile);
20932 if (per_cu->cu == NULL)
20938 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20942 return die_type (die, cu);
20945 /* Return the type of the DIE at DIE_OFFSET in the CU named by
20949 dwarf2_get_die_type (cu_offset die_offset,
20950 struct dwarf2_per_cu_data *per_cu)
20952 dw2_setup (per_cu->objfile);
20954 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
20955 return get_die_type_at_offset (die_offset_sect, per_cu);
20958 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
20959 On entry *REF_CU is the CU of SRC_DIE.
20960 On exit *REF_CU is the CU of the result.
20961 Returns NULL if the referenced DIE isn't found. */
20963 static struct die_info *
20964 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
20965 struct dwarf2_cu **ref_cu)
20967 struct die_info temp_die;
20968 struct dwarf2_cu *sig_cu;
20969 struct die_info *die;
20971 /* While it might be nice to assert sig_type->type == NULL here,
20972 we can get here for DW_AT_imported_declaration where we need
20973 the DIE not the type. */
20975 /* If necessary, add it to the queue and load its DIEs. */
20977 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
20978 read_signatured_type (sig_type);
20980 sig_cu = sig_type->per_cu.cu;
20981 gdb_assert (sig_cu != NULL);
20982 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
20983 temp_die.sect_off = sig_type->type_offset_in_section;
20984 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
20985 to_underlying (temp_die.sect_off));
20988 /* For .gdb_index version 7 keep track of included TUs.
20989 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
20990 if (dwarf2_per_objfile->index_table != NULL
20991 && dwarf2_per_objfile->index_table->version <= 7)
20993 VEC_safe_push (dwarf2_per_cu_ptr,
20994 (*ref_cu)->per_cu->imported_symtabs,
21005 /* Follow signatured type referenced by ATTR in SRC_DIE.
21006 On entry *REF_CU is the CU of SRC_DIE.
21007 On exit *REF_CU is the CU of the result.
21008 The result is the DIE of the type.
21009 If the referenced type cannot be found an error is thrown. */
21011 static struct die_info *
21012 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
21013 struct dwarf2_cu **ref_cu)
21015 ULONGEST signature = DW_SIGNATURE (attr);
21016 struct signatured_type *sig_type;
21017 struct die_info *die;
21019 gdb_assert (attr->form == DW_FORM_ref_sig8);
21021 sig_type = lookup_signatured_type (*ref_cu, signature);
21022 /* sig_type will be NULL if the signatured type is missing from
21024 if (sig_type == NULL)
21026 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
21027 " from DIE at 0x%x [in module %s]"),
21028 hex_string (signature), to_underlying (src_die->sect_off),
21029 objfile_name ((*ref_cu)->objfile));
21032 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
21035 dump_die_for_error (src_die);
21036 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
21037 " from DIE at 0x%x [in module %s]"),
21038 hex_string (signature), to_underlying (src_die->sect_off),
21039 objfile_name ((*ref_cu)->objfile));
21045 /* Get the type specified by SIGNATURE referenced in DIE/CU,
21046 reading in and processing the type unit if necessary. */
21048 static struct type *
21049 get_signatured_type (struct die_info *die, ULONGEST signature,
21050 struct dwarf2_cu *cu)
21052 struct signatured_type *sig_type;
21053 struct dwarf2_cu *type_cu;
21054 struct die_info *type_die;
21057 sig_type = lookup_signatured_type (cu, signature);
21058 /* sig_type will be NULL if the signatured type is missing from
21060 if (sig_type == NULL)
21062 complaint (&symfile_complaints,
21063 _("Dwarf Error: Cannot find signatured DIE %s referenced"
21064 " from DIE at 0x%x [in module %s]"),
21065 hex_string (signature), to_underlying (die->sect_off),
21066 objfile_name (dwarf2_per_objfile->objfile));
21067 return build_error_marker_type (cu, die);
21070 /* If we already know the type we're done. */
21071 if (sig_type->type != NULL)
21072 return sig_type->type;
21075 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
21076 if (type_die != NULL)
21078 /* N.B. We need to call get_die_type to ensure only one type for this DIE
21079 is created. This is important, for example, because for c++ classes
21080 we need TYPE_NAME set which is only done by new_symbol. Blech. */
21081 type = read_type_die (type_die, type_cu);
21084 complaint (&symfile_complaints,
21085 _("Dwarf Error: Cannot build signatured type %s"
21086 " referenced from DIE at 0x%x [in module %s]"),
21087 hex_string (signature), to_underlying (die->sect_off),
21088 objfile_name (dwarf2_per_objfile->objfile));
21089 type = build_error_marker_type (cu, die);
21094 complaint (&symfile_complaints,
21095 _("Dwarf Error: Problem reading signatured DIE %s referenced"
21096 " from DIE at 0x%x [in module %s]"),
21097 hex_string (signature), to_underlying (die->sect_off),
21098 objfile_name (dwarf2_per_objfile->objfile));
21099 type = build_error_marker_type (cu, die);
21101 sig_type->type = type;
21106 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
21107 reading in and processing the type unit if necessary. */
21109 static struct type *
21110 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
21111 struct dwarf2_cu *cu) /* ARI: editCase function */
21113 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
21114 if (attr_form_is_ref (attr))
21116 struct dwarf2_cu *type_cu = cu;
21117 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
21119 return read_type_die (type_die, type_cu);
21121 else if (attr->form == DW_FORM_ref_sig8)
21123 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
21127 complaint (&symfile_complaints,
21128 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
21129 " at 0x%x [in module %s]"),
21130 dwarf_form_name (attr->form), to_underlying (die->sect_off),
21131 objfile_name (dwarf2_per_objfile->objfile));
21132 return build_error_marker_type (cu, die);
21136 /* Load the DIEs associated with type unit PER_CU into memory. */
21139 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
21141 struct signatured_type *sig_type;
21143 /* Caller is responsible for ensuring type_unit_groups don't get here. */
21144 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
21146 /* We have the per_cu, but we need the signatured_type.
21147 Fortunately this is an easy translation. */
21148 gdb_assert (per_cu->is_debug_types);
21149 sig_type = (struct signatured_type *) per_cu;
21151 gdb_assert (per_cu->cu == NULL);
21153 read_signatured_type (sig_type);
21155 gdb_assert (per_cu->cu != NULL);
21158 /* die_reader_func for read_signatured_type.
21159 This is identical to load_full_comp_unit_reader,
21160 but is kept separate for now. */
21163 read_signatured_type_reader (const struct die_reader_specs *reader,
21164 const gdb_byte *info_ptr,
21165 struct die_info *comp_unit_die,
21169 struct dwarf2_cu *cu = reader->cu;
21171 gdb_assert (cu->die_hash == NULL);
21173 htab_create_alloc_ex (cu->header.length / 12,
21177 &cu->comp_unit_obstack,
21178 hashtab_obstack_allocate,
21179 dummy_obstack_deallocate);
21182 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
21183 &info_ptr, comp_unit_die);
21184 cu->dies = comp_unit_die;
21185 /* comp_unit_die is not stored in die_hash, no need. */
21187 /* We try not to read any attributes in this function, because not
21188 all CUs needed for references have been loaded yet, and symbol
21189 table processing isn't initialized. But we have to set the CU language,
21190 or we won't be able to build types correctly.
21191 Similarly, if we do not read the producer, we can not apply
21192 producer-specific interpretation. */
21193 prepare_one_comp_unit (cu, cu->dies, language_minimal);
21196 /* Read in a signatured type and build its CU and DIEs.
21197 If the type is a stub for the real type in a DWO file,
21198 read in the real type from the DWO file as well. */
21201 read_signatured_type (struct signatured_type *sig_type)
21203 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
21205 gdb_assert (per_cu->is_debug_types);
21206 gdb_assert (per_cu->cu == NULL);
21208 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
21209 read_signatured_type_reader, NULL);
21210 sig_type->per_cu.tu_read = 1;
21213 /* Decode simple location descriptions.
21214 Given a pointer to a dwarf block that defines a location, compute
21215 the location and return the value.
21217 NOTE drow/2003-11-18: This function is called in two situations
21218 now: for the address of static or global variables (partial symbols
21219 only) and for offsets into structures which are expected to be
21220 (more or less) constant. The partial symbol case should go away,
21221 and only the constant case should remain. That will let this
21222 function complain more accurately. A few special modes are allowed
21223 without complaint for global variables (for instance, global
21224 register values and thread-local values).
21226 A location description containing no operations indicates that the
21227 object is optimized out. The return value is 0 for that case.
21228 FIXME drow/2003-11-16: No callers check for this case any more; soon all
21229 callers will only want a very basic result and this can become a
21232 Note that stack[0] is unused except as a default error return. */
21235 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
21237 struct objfile *objfile = cu->objfile;
21239 size_t size = blk->size;
21240 const gdb_byte *data = blk->data;
21241 CORE_ADDR stack[64];
21243 unsigned int bytes_read, unsnd;
21249 stack[++stacki] = 0;
21288 stack[++stacki] = op - DW_OP_lit0;
21323 stack[++stacki] = op - DW_OP_reg0;
21325 dwarf2_complex_location_expr_complaint ();
21329 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
21331 stack[++stacki] = unsnd;
21333 dwarf2_complex_location_expr_complaint ();
21337 stack[++stacki] = read_address (objfile->obfd, &data[i],
21342 case DW_OP_const1u:
21343 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
21347 case DW_OP_const1s:
21348 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
21352 case DW_OP_const2u:
21353 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
21357 case DW_OP_const2s:
21358 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
21362 case DW_OP_const4u:
21363 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
21367 case DW_OP_const4s:
21368 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
21372 case DW_OP_const8u:
21373 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
21378 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
21384 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
21389 stack[stacki + 1] = stack[stacki];
21394 stack[stacki - 1] += stack[stacki];
21398 case DW_OP_plus_uconst:
21399 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
21405 stack[stacki - 1] -= stack[stacki];
21410 /* If we're not the last op, then we definitely can't encode
21411 this using GDB's address_class enum. This is valid for partial
21412 global symbols, although the variable's address will be bogus
21415 dwarf2_complex_location_expr_complaint ();
21418 case DW_OP_GNU_push_tls_address:
21419 case DW_OP_form_tls_address:
21420 /* The top of the stack has the offset from the beginning
21421 of the thread control block at which the variable is located. */
21422 /* Nothing should follow this operator, so the top of stack would
21424 /* This is valid for partial global symbols, but the variable's
21425 address will be bogus in the psymtab. Make it always at least
21426 non-zero to not look as a variable garbage collected by linker
21427 which have DW_OP_addr 0. */
21429 dwarf2_complex_location_expr_complaint ();
21433 case DW_OP_GNU_uninit:
21436 case DW_OP_GNU_addr_index:
21437 case DW_OP_GNU_const_index:
21438 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
21445 const char *name = get_DW_OP_name (op);
21448 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
21451 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
21455 return (stack[stacki]);
21458 /* Enforce maximum stack depth of SIZE-1 to avoid writing
21459 outside of the allocated space. Also enforce minimum>0. */
21460 if (stacki >= ARRAY_SIZE (stack) - 1)
21462 complaint (&symfile_complaints,
21463 _("location description stack overflow"));
21469 complaint (&symfile_complaints,
21470 _("location description stack underflow"));
21474 return (stack[stacki]);
21477 /* memory allocation interface */
21479 static struct dwarf_block *
21480 dwarf_alloc_block (struct dwarf2_cu *cu)
21482 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
21485 static struct die_info *
21486 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
21488 struct die_info *die;
21489 size_t size = sizeof (struct die_info);
21492 size += (num_attrs - 1) * sizeof (struct attribute);
21494 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
21495 memset (die, 0, sizeof (struct die_info));
21500 /* Macro support. */
21502 /* Return file name relative to the compilation directory of file number I in
21503 *LH's file name table. The result is allocated using xmalloc; the caller is
21504 responsible for freeing it. */
21507 file_file_name (int file, struct line_header *lh)
21509 /* Is the file number a valid index into the line header's file name
21510 table? Remember that file numbers start with one, not zero. */
21511 if (1 <= file && file <= lh->file_names.size ())
21513 const file_entry &fe = lh->file_names[file - 1];
21515 if (!IS_ABSOLUTE_PATH (fe.name))
21517 const char *dir = fe.include_dir (lh);
21519 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
21521 return xstrdup (fe.name);
21525 /* The compiler produced a bogus file number. We can at least
21526 record the macro definitions made in the file, even if we
21527 won't be able to find the file by name. */
21528 char fake_name[80];
21530 xsnprintf (fake_name, sizeof (fake_name),
21531 "<bad macro file number %d>", file);
21533 complaint (&symfile_complaints,
21534 _("bad file number in macro information (%d)"),
21537 return xstrdup (fake_name);
21541 /* Return the full name of file number I in *LH's file name table.
21542 Use COMP_DIR as the name of the current directory of the
21543 compilation. The result is allocated using xmalloc; the caller is
21544 responsible for freeing it. */
21546 file_full_name (int file, struct line_header *lh, const char *comp_dir)
21548 /* Is the file number a valid index into the line header's file name
21549 table? Remember that file numbers start with one, not zero. */
21550 if (1 <= file && file <= lh->file_names.size ())
21552 char *relative = file_file_name (file, lh);
21554 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
21556 return reconcat (relative, comp_dir, SLASH_STRING,
21557 relative, (char *) NULL);
21560 return file_file_name (file, lh);
21564 static struct macro_source_file *
21565 macro_start_file (int file, int line,
21566 struct macro_source_file *current_file,
21567 struct line_header *lh)
21569 /* File name relative to the compilation directory of this source file. */
21570 char *file_name = file_file_name (file, lh);
21572 if (! current_file)
21574 /* Note: We don't create a macro table for this compilation unit
21575 at all until we actually get a filename. */
21576 struct macro_table *macro_table = get_macro_table ();
21578 /* If we have no current file, then this must be the start_file
21579 directive for the compilation unit's main source file. */
21580 current_file = macro_set_main (macro_table, file_name);
21581 macro_define_special (macro_table);
21584 current_file = macro_include (current_file, line, file_name);
21588 return current_file;
21592 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
21593 followed by a null byte. */
21595 copy_string (const char *buf, int len)
21597 char *s = (char *) xmalloc (len + 1);
21599 memcpy (s, buf, len);
21605 static const char *
21606 consume_improper_spaces (const char *p, const char *body)
21610 complaint (&symfile_complaints,
21611 _("macro definition contains spaces "
21612 "in formal argument list:\n`%s'"),
21624 parse_macro_definition (struct macro_source_file *file, int line,
21629 /* The body string takes one of two forms. For object-like macro
21630 definitions, it should be:
21632 <macro name> " " <definition>
21634 For function-like macro definitions, it should be:
21636 <macro name> "() " <definition>
21638 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
21640 Spaces may appear only where explicitly indicated, and in the
21643 The Dwarf 2 spec says that an object-like macro's name is always
21644 followed by a space, but versions of GCC around March 2002 omit
21645 the space when the macro's definition is the empty string.
21647 The Dwarf 2 spec says that there should be no spaces between the
21648 formal arguments in a function-like macro's formal argument list,
21649 but versions of GCC around March 2002 include spaces after the
21653 /* Find the extent of the macro name. The macro name is terminated
21654 by either a space or null character (for an object-like macro) or
21655 an opening paren (for a function-like macro). */
21656 for (p = body; *p; p++)
21657 if (*p == ' ' || *p == '(')
21660 if (*p == ' ' || *p == '\0')
21662 /* It's an object-like macro. */
21663 int name_len = p - body;
21664 char *name = copy_string (body, name_len);
21665 const char *replacement;
21668 replacement = body + name_len + 1;
21671 dwarf2_macro_malformed_definition_complaint (body);
21672 replacement = body + name_len;
21675 macro_define_object (file, line, name, replacement);
21679 else if (*p == '(')
21681 /* It's a function-like macro. */
21682 char *name = copy_string (body, p - body);
21685 char **argv = XNEWVEC (char *, argv_size);
21689 p = consume_improper_spaces (p, body);
21691 /* Parse the formal argument list. */
21692 while (*p && *p != ')')
21694 /* Find the extent of the current argument name. */
21695 const char *arg_start = p;
21697 while (*p && *p != ',' && *p != ')' && *p != ' ')
21700 if (! *p || p == arg_start)
21701 dwarf2_macro_malformed_definition_complaint (body);
21704 /* Make sure argv has room for the new argument. */
21705 if (argc >= argv_size)
21708 argv = XRESIZEVEC (char *, argv, argv_size);
21711 argv[argc++] = copy_string (arg_start, p - arg_start);
21714 p = consume_improper_spaces (p, body);
21716 /* Consume the comma, if present. */
21721 p = consume_improper_spaces (p, body);
21730 /* Perfectly formed definition, no complaints. */
21731 macro_define_function (file, line, name,
21732 argc, (const char **) argv,
21734 else if (*p == '\0')
21736 /* Complain, but do define it. */
21737 dwarf2_macro_malformed_definition_complaint (body);
21738 macro_define_function (file, line, name,
21739 argc, (const char **) argv,
21743 /* Just complain. */
21744 dwarf2_macro_malformed_definition_complaint (body);
21747 /* Just complain. */
21748 dwarf2_macro_malformed_definition_complaint (body);
21754 for (i = 0; i < argc; i++)
21760 dwarf2_macro_malformed_definition_complaint (body);
21763 /* Skip some bytes from BYTES according to the form given in FORM.
21764 Returns the new pointer. */
21766 static const gdb_byte *
21767 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
21768 enum dwarf_form form,
21769 unsigned int offset_size,
21770 struct dwarf2_section_info *section)
21772 unsigned int bytes_read;
21776 case DW_FORM_data1:
21781 case DW_FORM_data2:
21785 case DW_FORM_data4:
21789 case DW_FORM_data8:
21793 case DW_FORM_data16:
21797 case DW_FORM_string:
21798 read_direct_string (abfd, bytes, &bytes_read);
21799 bytes += bytes_read;
21802 case DW_FORM_sec_offset:
21804 case DW_FORM_GNU_strp_alt:
21805 bytes += offset_size;
21808 case DW_FORM_block:
21809 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
21810 bytes += bytes_read;
21813 case DW_FORM_block1:
21814 bytes += 1 + read_1_byte (abfd, bytes);
21816 case DW_FORM_block2:
21817 bytes += 2 + read_2_bytes (abfd, bytes);
21819 case DW_FORM_block4:
21820 bytes += 4 + read_4_bytes (abfd, bytes);
21823 case DW_FORM_sdata:
21824 case DW_FORM_udata:
21825 case DW_FORM_GNU_addr_index:
21826 case DW_FORM_GNU_str_index:
21827 bytes = gdb_skip_leb128 (bytes, buffer_end);
21830 dwarf2_section_buffer_overflow_complaint (section);
21838 complaint (&symfile_complaints,
21839 _("invalid form 0x%x in `%s'"),
21840 form, get_section_name (section));
21848 /* A helper for dwarf_decode_macros that handles skipping an unknown
21849 opcode. Returns an updated pointer to the macro data buffer; or,
21850 on error, issues a complaint and returns NULL. */
21852 static const gdb_byte *
21853 skip_unknown_opcode (unsigned int opcode,
21854 const gdb_byte **opcode_definitions,
21855 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
21857 unsigned int offset_size,
21858 struct dwarf2_section_info *section)
21860 unsigned int bytes_read, i;
21862 const gdb_byte *defn;
21864 if (opcode_definitions[opcode] == NULL)
21866 complaint (&symfile_complaints,
21867 _("unrecognized DW_MACFINO opcode 0x%x"),
21872 defn = opcode_definitions[opcode];
21873 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
21874 defn += bytes_read;
21876 for (i = 0; i < arg; ++i)
21878 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
21879 (enum dwarf_form) defn[i], offset_size,
21881 if (mac_ptr == NULL)
21883 /* skip_form_bytes already issued the complaint. */
21891 /* A helper function which parses the header of a macro section.
21892 If the macro section is the extended (for now called "GNU") type,
21893 then this updates *OFFSET_SIZE. Returns a pointer to just after
21894 the header, or issues a complaint and returns NULL on error. */
21896 static const gdb_byte *
21897 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
21899 const gdb_byte *mac_ptr,
21900 unsigned int *offset_size,
21901 int section_is_gnu)
21903 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
21905 if (section_is_gnu)
21907 unsigned int version, flags;
21909 version = read_2_bytes (abfd, mac_ptr);
21910 if (version != 4 && version != 5)
21912 complaint (&symfile_complaints,
21913 _("unrecognized version `%d' in .debug_macro section"),
21919 flags = read_1_byte (abfd, mac_ptr);
21921 *offset_size = (flags & 1) ? 8 : 4;
21923 if ((flags & 2) != 0)
21924 /* We don't need the line table offset. */
21925 mac_ptr += *offset_size;
21927 /* Vendor opcode descriptions. */
21928 if ((flags & 4) != 0)
21930 unsigned int i, count;
21932 count = read_1_byte (abfd, mac_ptr);
21934 for (i = 0; i < count; ++i)
21936 unsigned int opcode, bytes_read;
21939 opcode = read_1_byte (abfd, mac_ptr);
21941 opcode_definitions[opcode] = mac_ptr;
21942 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
21943 mac_ptr += bytes_read;
21952 /* A helper for dwarf_decode_macros that handles the GNU extensions,
21953 including DW_MACRO_import. */
21956 dwarf_decode_macro_bytes (bfd *abfd,
21957 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
21958 struct macro_source_file *current_file,
21959 struct line_header *lh,
21960 struct dwarf2_section_info *section,
21961 int section_is_gnu, int section_is_dwz,
21962 unsigned int offset_size,
21963 htab_t include_hash)
21965 struct objfile *objfile = dwarf2_per_objfile->objfile;
21966 enum dwarf_macro_record_type macinfo_type;
21967 int at_commandline;
21968 const gdb_byte *opcode_definitions[256];
21970 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
21971 &offset_size, section_is_gnu);
21972 if (mac_ptr == NULL)
21974 /* We already issued a complaint. */
21978 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
21979 GDB is still reading the definitions from command line. First
21980 DW_MACINFO_start_file will need to be ignored as it was already executed
21981 to create CURRENT_FILE for the main source holding also the command line
21982 definitions. On first met DW_MACINFO_start_file this flag is reset to
21983 normally execute all the remaining DW_MACINFO_start_file macinfos. */
21985 at_commandline = 1;
21989 /* Do we at least have room for a macinfo type byte? */
21990 if (mac_ptr >= mac_end)
21992 dwarf2_section_buffer_overflow_complaint (section);
21996 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
21999 /* Note that we rely on the fact that the corresponding GNU and
22000 DWARF constants are the same. */
22001 switch (macinfo_type)
22003 /* A zero macinfo type indicates the end of the macro
22008 case DW_MACRO_define:
22009 case DW_MACRO_undef:
22010 case DW_MACRO_define_strp:
22011 case DW_MACRO_undef_strp:
22012 case DW_MACRO_define_sup:
22013 case DW_MACRO_undef_sup:
22015 unsigned int bytes_read;
22020 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22021 mac_ptr += bytes_read;
22023 if (macinfo_type == DW_MACRO_define
22024 || macinfo_type == DW_MACRO_undef)
22026 body = read_direct_string (abfd, mac_ptr, &bytes_read);
22027 mac_ptr += bytes_read;
22031 LONGEST str_offset;
22033 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
22034 mac_ptr += offset_size;
22036 if (macinfo_type == DW_MACRO_define_sup
22037 || macinfo_type == DW_MACRO_undef_sup
22040 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22042 body = read_indirect_string_from_dwz (dwz, str_offset);
22045 body = read_indirect_string_at_offset (abfd, str_offset);
22048 is_define = (macinfo_type == DW_MACRO_define
22049 || macinfo_type == DW_MACRO_define_strp
22050 || macinfo_type == DW_MACRO_define_sup);
22051 if (! current_file)
22053 /* DWARF violation as no main source is present. */
22054 complaint (&symfile_complaints,
22055 _("debug info with no main source gives macro %s "
22057 is_define ? _("definition") : _("undefinition"),
22061 if ((line == 0 && !at_commandline)
22062 || (line != 0 && at_commandline))
22063 complaint (&symfile_complaints,
22064 _("debug info gives %s macro %s with %s line %d: %s"),
22065 at_commandline ? _("command-line") : _("in-file"),
22066 is_define ? _("definition") : _("undefinition"),
22067 line == 0 ? _("zero") : _("non-zero"), line, body);
22070 parse_macro_definition (current_file, line, body);
22073 gdb_assert (macinfo_type == DW_MACRO_undef
22074 || macinfo_type == DW_MACRO_undef_strp
22075 || macinfo_type == DW_MACRO_undef_sup);
22076 macro_undef (current_file, line, body);
22081 case DW_MACRO_start_file:
22083 unsigned int bytes_read;
22086 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22087 mac_ptr += bytes_read;
22088 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22089 mac_ptr += bytes_read;
22091 if ((line == 0 && !at_commandline)
22092 || (line != 0 && at_commandline))
22093 complaint (&symfile_complaints,
22094 _("debug info gives source %d included "
22095 "from %s at %s line %d"),
22096 file, at_commandline ? _("command-line") : _("file"),
22097 line == 0 ? _("zero") : _("non-zero"), line);
22099 if (at_commandline)
22101 /* This DW_MACRO_start_file was executed in the
22103 at_commandline = 0;
22106 current_file = macro_start_file (file, line, current_file, lh);
22110 case DW_MACRO_end_file:
22111 if (! current_file)
22112 complaint (&symfile_complaints,
22113 _("macro debug info has an unmatched "
22114 "`close_file' directive"));
22117 current_file = current_file->included_by;
22118 if (! current_file)
22120 enum dwarf_macro_record_type next_type;
22122 /* GCC circa March 2002 doesn't produce the zero
22123 type byte marking the end of the compilation
22124 unit. Complain if it's not there, but exit no
22127 /* Do we at least have room for a macinfo type byte? */
22128 if (mac_ptr >= mac_end)
22130 dwarf2_section_buffer_overflow_complaint (section);
22134 /* We don't increment mac_ptr here, so this is just
22137 = (enum dwarf_macro_record_type) read_1_byte (abfd,
22139 if (next_type != 0)
22140 complaint (&symfile_complaints,
22141 _("no terminating 0-type entry for "
22142 "macros in `.debug_macinfo' section"));
22149 case DW_MACRO_import:
22150 case DW_MACRO_import_sup:
22154 bfd *include_bfd = abfd;
22155 struct dwarf2_section_info *include_section = section;
22156 const gdb_byte *include_mac_end = mac_end;
22157 int is_dwz = section_is_dwz;
22158 const gdb_byte *new_mac_ptr;
22160 offset = read_offset_1 (abfd, mac_ptr, offset_size);
22161 mac_ptr += offset_size;
22163 if (macinfo_type == DW_MACRO_import_sup)
22165 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22167 dwarf2_read_section (objfile, &dwz->macro);
22169 include_section = &dwz->macro;
22170 include_bfd = get_section_bfd_owner (include_section);
22171 include_mac_end = dwz->macro.buffer + dwz->macro.size;
22175 new_mac_ptr = include_section->buffer + offset;
22176 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
22180 /* This has actually happened; see
22181 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
22182 complaint (&symfile_complaints,
22183 _("recursive DW_MACRO_import in "
22184 ".debug_macro section"));
22188 *slot = (void *) new_mac_ptr;
22190 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
22191 include_mac_end, current_file, lh,
22192 section, section_is_gnu, is_dwz,
22193 offset_size, include_hash);
22195 htab_remove_elt (include_hash, (void *) new_mac_ptr);
22200 case DW_MACINFO_vendor_ext:
22201 if (!section_is_gnu)
22203 unsigned int bytes_read;
22205 /* This reads the constant, but since we don't recognize
22206 any vendor extensions, we ignore it. */
22207 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22208 mac_ptr += bytes_read;
22209 read_direct_string (abfd, mac_ptr, &bytes_read);
22210 mac_ptr += bytes_read;
22212 /* We don't recognize any vendor extensions. */
22218 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
22219 mac_ptr, mac_end, abfd, offset_size,
22221 if (mac_ptr == NULL)
22225 } while (macinfo_type != 0);
22229 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
22230 int section_is_gnu)
22232 struct objfile *objfile = dwarf2_per_objfile->objfile;
22233 struct line_header *lh = cu->line_header;
22235 const gdb_byte *mac_ptr, *mac_end;
22236 struct macro_source_file *current_file = 0;
22237 enum dwarf_macro_record_type macinfo_type;
22238 unsigned int offset_size = cu->header.offset_size;
22239 const gdb_byte *opcode_definitions[256];
22240 struct cleanup *cleanup;
22242 struct dwarf2_section_info *section;
22243 const char *section_name;
22245 if (cu->dwo_unit != NULL)
22247 if (section_is_gnu)
22249 section = &cu->dwo_unit->dwo_file->sections.macro;
22250 section_name = ".debug_macro.dwo";
22254 section = &cu->dwo_unit->dwo_file->sections.macinfo;
22255 section_name = ".debug_macinfo.dwo";
22260 if (section_is_gnu)
22262 section = &dwarf2_per_objfile->macro;
22263 section_name = ".debug_macro";
22267 section = &dwarf2_per_objfile->macinfo;
22268 section_name = ".debug_macinfo";
22272 dwarf2_read_section (objfile, section);
22273 if (section->buffer == NULL)
22275 complaint (&symfile_complaints, _("missing %s section"), section_name);
22278 abfd = get_section_bfd_owner (section);
22280 /* First pass: Find the name of the base filename.
22281 This filename is needed in order to process all macros whose definition
22282 (or undefinition) comes from the command line. These macros are defined
22283 before the first DW_MACINFO_start_file entry, and yet still need to be
22284 associated to the base file.
22286 To determine the base file name, we scan the macro definitions until we
22287 reach the first DW_MACINFO_start_file entry. We then initialize
22288 CURRENT_FILE accordingly so that any macro definition found before the
22289 first DW_MACINFO_start_file can still be associated to the base file. */
22291 mac_ptr = section->buffer + offset;
22292 mac_end = section->buffer + section->size;
22294 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
22295 &offset_size, section_is_gnu);
22296 if (mac_ptr == NULL)
22298 /* We already issued a complaint. */
22304 /* Do we at least have room for a macinfo type byte? */
22305 if (mac_ptr >= mac_end)
22307 /* Complaint is printed during the second pass as GDB will probably
22308 stop the first pass earlier upon finding
22309 DW_MACINFO_start_file. */
22313 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
22316 /* Note that we rely on the fact that the corresponding GNU and
22317 DWARF constants are the same. */
22318 switch (macinfo_type)
22320 /* A zero macinfo type indicates the end of the macro
22325 case DW_MACRO_define:
22326 case DW_MACRO_undef:
22327 /* Only skip the data by MAC_PTR. */
22329 unsigned int bytes_read;
22331 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22332 mac_ptr += bytes_read;
22333 read_direct_string (abfd, mac_ptr, &bytes_read);
22334 mac_ptr += bytes_read;
22338 case DW_MACRO_start_file:
22340 unsigned int bytes_read;
22343 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22344 mac_ptr += bytes_read;
22345 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22346 mac_ptr += bytes_read;
22348 current_file = macro_start_file (file, line, current_file, lh);
22352 case DW_MACRO_end_file:
22353 /* No data to skip by MAC_PTR. */
22356 case DW_MACRO_define_strp:
22357 case DW_MACRO_undef_strp:
22358 case DW_MACRO_define_sup:
22359 case DW_MACRO_undef_sup:
22361 unsigned int bytes_read;
22363 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22364 mac_ptr += bytes_read;
22365 mac_ptr += offset_size;
22369 case DW_MACRO_import:
22370 case DW_MACRO_import_sup:
22371 /* Note that, according to the spec, a transparent include
22372 chain cannot call DW_MACRO_start_file. So, we can just
22373 skip this opcode. */
22374 mac_ptr += offset_size;
22377 case DW_MACINFO_vendor_ext:
22378 /* Only skip the data by MAC_PTR. */
22379 if (!section_is_gnu)
22381 unsigned int bytes_read;
22383 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22384 mac_ptr += bytes_read;
22385 read_direct_string (abfd, mac_ptr, &bytes_read);
22386 mac_ptr += bytes_read;
22391 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
22392 mac_ptr, mac_end, abfd, offset_size,
22394 if (mac_ptr == NULL)
22398 } while (macinfo_type != 0 && current_file == NULL);
22400 /* Second pass: Process all entries.
22402 Use the AT_COMMAND_LINE flag to determine whether we are still processing
22403 command-line macro definitions/undefinitions. This flag is unset when we
22404 reach the first DW_MACINFO_start_file entry. */
22406 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
22408 NULL, xcalloc, xfree));
22409 mac_ptr = section->buffer + offset;
22410 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
22411 *slot = (void *) mac_ptr;
22412 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
22413 current_file, lh, section,
22414 section_is_gnu, 0, offset_size,
22415 include_hash.get ());
22418 /* Check if the attribute's form is a DW_FORM_block*
22419 if so return true else false. */
22422 attr_form_is_block (const struct attribute *attr)
22424 return (attr == NULL ? 0 :
22425 attr->form == DW_FORM_block1
22426 || attr->form == DW_FORM_block2
22427 || attr->form == DW_FORM_block4
22428 || attr->form == DW_FORM_block
22429 || attr->form == DW_FORM_exprloc);
22432 /* Return non-zero if ATTR's value is a section offset --- classes
22433 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
22434 You may use DW_UNSND (attr) to retrieve such offsets.
22436 Section 7.5.4, "Attribute Encodings", explains that no attribute
22437 may have a value that belongs to more than one of these classes; it
22438 would be ambiguous if we did, because we use the same forms for all
22442 attr_form_is_section_offset (const struct attribute *attr)
22444 return (attr->form == DW_FORM_data4
22445 || attr->form == DW_FORM_data8
22446 || attr->form == DW_FORM_sec_offset);
22449 /* Return non-zero if ATTR's value falls in the 'constant' class, or
22450 zero otherwise. When this function returns true, you can apply
22451 dwarf2_get_attr_constant_value to it.
22453 However, note that for some attributes you must check
22454 attr_form_is_section_offset before using this test. DW_FORM_data4
22455 and DW_FORM_data8 are members of both the constant class, and of
22456 the classes that contain offsets into other debug sections
22457 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
22458 that, if an attribute's can be either a constant or one of the
22459 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
22460 taken as section offsets, not constants.
22462 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
22463 cannot handle that. */
22466 attr_form_is_constant (const struct attribute *attr)
22468 switch (attr->form)
22470 case DW_FORM_sdata:
22471 case DW_FORM_udata:
22472 case DW_FORM_data1:
22473 case DW_FORM_data2:
22474 case DW_FORM_data4:
22475 case DW_FORM_data8:
22483 /* DW_ADDR is always stored already as sect_offset; despite for the forms
22484 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
22487 attr_form_is_ref (const struct attribute *attr)
22489 switch (attr->form)
22491 case DW_FORM_ref_addr:
22496 case DW_FORM_ref_udata:
22497 case DW_FORM_GNU_ref_alt:
22504 /* Return the .debug_loc section to use for CU.
22505 For DWO files use .debug_loc.dwo. */
22507 static struct dwarf2_section_info *
22508 cu_debug_loc_section (struct dwarf2_cu *cu)
22512 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
22514 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
22516 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
22517 : &dwarf2_per_objfile->loc);
22520 /* A helper function that fills in a dwarf2_loclist_baton. */
22523 fill_in_loclist_baton (struct dwarf2_cu *cu,
22524 struct dwarf2_loclist_baton *baton,
22525 const struct attribute *attr)
22527 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
22529 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
22531 baton->per_cu = cu->per_cu;
22532 gdb_assert (baton->per_cu);
22533 /* We don't know how long the location list is, but make sure we
22534 don't run off the edge of the section. */
22535 baton->size = section->size - DW_UNSND (attr);
22536 baton->data = section->buffer + DW_UNSND (attr);
22537 baton->base_address = cu->base_address;
22538 baton->from_dwo = cu->dwo_unit != NULL;
22542 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
22543 struct dwarf2_cu *cu, int is_block)
22545 struct objfile *objfile = dwarf2_per_objfile->objfile;
22546 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
22548 if (attr_form_is_section_offset (attr)
22549 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
22550 the section. If so, fall through to the complaint in the
22552 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
22554 struct dwarf2_loclist_baton *baton;
22556 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
22558 fill_in_loclist_baton (cu, baton, attr);
22560 if (cu->base_known == 0)
22561 complaint (&symfile_complaints,
22562 _("Location list used without "
22563 "specifying the CU base address."));
22565 SYMBOL_ACLASS_INDEX (sym) = (is_block
22566 ? dwarf2_loclist_block_index
22567 : dwarf2_loclist_index);
22568 SYMBOL_LOCATION_BATON (sym) = baton;
22572 struct dwarf2_locexpr_baton *baton;
22574 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
22575 baton->per_cu = cu->per_cu;
22576 gdb_assert (baton->per_cu);
22578 if (attr_form_is_block (attr))
22580 /* Note that we're just copying the block's data pointer
22581 here, not the actual data. We're still pointing into the
22582 info_buffer for SYM's objfile; right now we never release
22583 that buffer, but when we do clean up properly this may
22585 baton->size = DW_BLOCK (attr)->size;
22586 baton->data = DW_BLOCK (attr)->data;
22590 dwarf2_invalid_attrib_class_complaint ("location description",
22591 SYMBOL_NATURAL_NAME (sym));
22595 SYMBOL_ACLASS_INDEX (sym) = (is_block
22596 ? dwarf2_locexpr_block_index
22597 : dwarf2_locexpr_index);
22598 SYMBOL_LOCATION_BATON (sym) = baton;
22602 /* Return the OBJFILE associated with the compilation unit CU. If CU
22603 came from a separate debuginfo file, then the master objfile is
22607 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
22609 struct objfile *objfile = per_cu->objfile;
22611 /* Return the master objfile, so that we can report and look up the
22612 correct file containing this variable. */
22613 if (objfile->separate_debug_objfile_backlink)
22614 objfile = objfile->separate_debug_objfile_backlink;
22619 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
22620 (CU_HEADERP is unused in such case) or prepare a temporary copy at
22621 CU_HEADERP first. */
22623 static const struct comp_unit_head *
22624 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
22625 struct dwarf2_per_cu_data *per_cu)
22627 const gdb_byte *info_ptr;
22630 return &per_cu->cu->header;
22632 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
22634 memset (cu_headerp, 0, sizeof (*cu_headerp));
22635 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
22636 rcuh_kind::COMPILE);
22641 /* Return the address size given in the compilation unit header for CU. */
22644 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
22646 struct comp_unit_head cu_header_local;
22647 const struct comp_unit_head *cu_headerp;
22649 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22651 return cu_headerp->addr_size;
22654 /* Return the offset size given in the compilation unit header for CU. */
22657 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
22659 struct comp_unit_head cu_header_local;
22660 const struct comp_unit_head *cu_headerp;
22662 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22664 return cu_headerp->offset_size;
22667 /* See its dwarf2loc.h declaration. */
22670 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
22672 struct comp_unit_head cu_header_local;
22673 const struct comp_unit_head *cu_headerp;
22675 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22677 if (cu_headerp->version == 2)
22678 return cu_headerp->addr_size;
22680 return cu_headerp->offset_size;
22683 /* Return the text offset of the CU. The returned offset comes from
22684 this CU's objfile. If this objfile came from a separate debuginfo
22685 file, then the offset may be different from the corresponding
22686 offset in the parent objfile. */
22689 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
22691 struct objfile *objfile = per_cu->objfile;
22693 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
22696 /* Return DWARF version number of PER_CU. */
22699 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
22701 return per_cu->dwarf_version;
22704 /* Locate the .debug_info compilation unit from CU's objfile which contains
22705 the DIE at OFFSET. Raises an error on failure. */
22707 static struct dwarf2_per_cu_data *
22708 dwarf2_find_containing_comp_unit (sect_offset sect_off,
22709 unsigned int offset_in_dwz,
22710 struct objfile *objfile)
22712 struct dwarf2_per_cu_data *this_cu;
22714 const sect_offset *cu_off;
22717 high = dwarf2_per_objfile->n_comp_units - 1;
22720 struct dwarf2_per_cu_data *mid_cu;
22721 int mid = low + (high - low) / 2;
22723 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
22724 cu_off = &mid_cu->sect_off;
22725 if (mid_cu->is_dwz > offset_in_dwz
22726 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
22731 gdb_assert (low == high);
22732 this_cu = dwarf2_per_objfile->all_comp_units[low];
22733 cu_off = &this_cu->sect_off;
22734 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
22736 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
22737 error (_("Dwarf Error: could not find partial DIE containing "
22738 "offset 0x%x [in module %s]"),
22739 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
22741 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
22743 return dwarf2_per_objfile->all_comp_units[low-1];
22747 this_cu = dwarf2_per_objfile->all_comp_units[low];
22748 if (low == dwarf2_per_objfile->n_comp_units - 1
22749 && sect_off >= this_cu->sect_off + this_cu->length)
22750 error (_("invalid dwarf2 offset %u"), to_underlying (sect_off));
22751 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
22756 /* Initialize dwarf2_cu CU, owned by PER_CU. */
22759 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
22761 memset (cu, 0, sizeof (*cu));
22763 cu->per_cu = per_cu;
22764 cu->objfile = per_cu->objfile;
22765 obstack_init (&cu->comp_unit_obstack);
22768 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
22771 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
22772 enum language pretend_language)
22774 struct attribute *attr;
22776 /* Set the language we're debugging. */
22777 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
22779 set_cu_language (DW_UNSND (attr), cu);
22782 cu->language = pretend_language;
22783 cu->language_defn = language_def (cu->language);
22786 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
22789 /* Release one cached compilation unit, CU. We unlink it from the tree
22790 of compilation units, but we don't remove it from the read_in_chain;
22791 the caller is responsible for that.
22792 NOTE: DATA is a void * because this function is also used as a
22793 cleanup routine. */
22796 free_heap_comp_unit (void *data)
22798 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22800 gdb_assert (cu->per_cu != NULL);
22801 cu->per_cu->cu = NULL;
22804 obstack_free (&cu->comp_unit_obstack, NULL);
22809 /* This cleanup function is passed the address of a dwarf2_cu on the stack
22810 when we're finished with it. We can't free the pointer itself, but be
22811 sure to unlink it from the cache. Also release any associated storage. */
22814 free_stack_comp_unit (void *data)
22816 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22818 gdb_assert (cu->per_cu != NULL);
22819 cu->per_cu->cu = NULL;
22822 obstack_free (&cu->comp_unit_obstack, NULL);
22823 cu->partial_dies = NULL;
22826 /* Free all cached compilation units. */
22829 free_cached_comp_units (void *data)
22831 dwarf2_per_objfile->free_cached_comp_units ();
22834 /* Increase the age counter on each cached compilation unit, and free
22835 any that are too old. */
22838 age_cached_comp_units (void)
22840 struct dwarf2_per_cu_data *per_cu, **last_chain;
22842 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
22843 per_cu = dwarf2_per_objfile->read_in_chain;
22844 while (per_cu != NULL)
22846 per_cu->cu->last_used ++;
22847 if (per_cu->cu->last_used <= dwarf_max_cache_age)
22848 dwarf2_mark (per_cu->cu);
22849 per_cu = per_cu->cu->read_in_chain;
22852 per_cu = dwarf2_per_objfile->read_in_chain;
22853 last_chain = &dwarf2_per_objfile->read_in_chain;
22854 while (per_cu != NULL)
22856 struct dwarf2_per_cu_data *next_cu;
22858 next_cu = per_cu->cu->read_in_chain;
22860 if (!per_cu->cu->mark)
22862 free_heap_comp_unit (per_cu->cu);
22863 *last_chain = next_cu;
22866 last_chain = &per_cu->cu->read_in_chain;
22872 /* Remove a single compilation unit from the cache. */
22875 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
22877 struct dwarf2_per_cu_data *per_cu, **last_chain;
22879 per_cu = dwarf2_per_objfile->read_in_chain;
22880 last_chain = &dwarf2_per_objfile->read_in_chain;
22881 while (per_cu != NULL)
22883 struct dwarf2_per_cu_data *next_cu;
22885 next_cu = per_cu->cu->read_in_chain;
22887 if (per_cu == target_per_cu)
22889 free_heap_comp_unit (per_cu->cu);
22891 *last_chain = next_cu;
22895 last_chain = &per_cu->cu->read_in_chain;
22901 /* Release all extra memory associated with OBJFILE. */
22904 dwarf2_free_objfile (struct objfile *objfile)
22907 = (struct dwarf2_per_objfile *) objfile_data (objfile,
22908 dwarf2_objfile_data_key);
22910 if (dwarf2_per_objfile == NULL)
22913 dwarf2_per_objfile->~dwarf2_per_objfile ();
22916 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
22917 We store these in a hash table separate from the DIEs, and preserve them
22918 when the DIEs are flushed out of cache.
22920 The CU "per_cu" pointer is needed because offset alone is not enough to
22921 uniquely identify the type. A file may have multiple .debug_types sections,
22922 or the type may come from a DWO file. Furthermore, while it's more logical
22923 to use per_cu->section+offset, with Fission the section with the data is in
22924 the DWO file but we don't know that section at the point we need it.
22925 We have to use something in dwarf2_per_cu_data (or the pointer to it)
22926 because we can enter the lookup routine, get_die_type_at_offset, from
22927 outside this file, and thus won't necessarily have PER_CU->cu.
22928 Fortunately, PER_CU is stable for the life of the objfile. */
22930 struct dwarf2_per_cu_offset_and_type
22932 const struct dwarf2_per_cu_data *per_cu;
22933 sect_offset sect_off;
22937 /* Hash function for a dwarf2_per_cu_offset_and_type. */
22940 per_cu_offset_and_type_hash (const void *item)
22942 const struct dwarf2_per_cu_offset_and_type *ofs
22943 = (const struct dwarf2_per_cu_offset_and_type *) item;
22945 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
22948 /* Equality function for a dwarf2_per_cu_offset_and_type. */
22951 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
22953 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
22954 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
22955 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
22956 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
22958 return (ofs_lhs->per_cu == ofs_rhs->per_cu
22959 && ofs_lhs->sect_off == ofs_rhs->sect_off);
22962 /* Set the type associated with DIE to TYPE. Save it in CU's hash
22963 table if necessary. For convenience, return TYPE.
22965 The DIEs reading must have careful ordering to:
22966 * Not cause infite loops trying to read in DIEs as a prerequisite for
22967 reading current DIE.
22968 * Not trying to dereference contents of still incompletely read in types
22969 while reading in other DIEs.
22970 * Enable referencing still incompletely read in types just by a pointer to
22971 the type without accessing its fields.
22973 Therefore caller should follow these rules:
22974 * Try to fetch any prerequisite types we may need to build this DIE type
22975 before building the type and calling set_die_type.
22976 * After building type call set_die_type for current DIE as soon as
22977 possible before fetching more types to complete the current type.
22978 * Make the type as complete as possible before fetching more types. */
22980 static struct type *
22981 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
22983 struct dwarf2_per_cu_offset_and_type **slot, ofs;
22984 struct objfile *objfile = cu->objfile;
22985 struct attribute *attr;
22986 struct dynamic_prop prop;
22988 /* For Ada types, make sure that the gnat-specific data is always
22989 initialized (if not already set). There are a few types where
22990 we should not be doing so, because the type-specific area is
22991 already used to hold some other piece of info (eg: TYPE_CODE_FLT
22992 where the type-specific area is used to store the floatformat).
22993 But this is not a problem, because the gnat-specific information
22994 is actually not needed for these types. */
22995 if (need_gnat_info (cu)
22996 && TYPE_CODE (type) != TYPE_CODE_FUNC
22997 && TYPE_CODE (type) != TYPE_CODE_FLT
22998 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
22999 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
23000 && TYPE_CODE (type) != TYPE_CODE_METHOD
23001 && !HAVE_GNAT_AUX_INFO (type))
23002 INIT_GNAT_SPECIFIC (type);
23004 /* Read DW_AT_allocated and set in type. */
23005 attr = dwarf2_attr (die, DW_AT_allocated, cu);
23006 if (attr_form_is_block (attr))
23008 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23009 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type, objfile);
23011 else if (attr != NULL)
23013 complaint (&symfile_complaints,
23014 _("DW_AT_allocated has the wrong form (%s) at DIE 0x%x"),
23015 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23016 to_underlying (die->sect_off));
23019 /* Read DW_AT_associated and set in type. */
23020 attr = dwarf2_attr (die, DW_AT_associated, cu);
23021 if (attr_form_is_block (attr))
23023 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23024 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type, objfile);
23026 else if (attr != NULL)
23028 complaint (&symfile_complaints,
23029 _("DW_AT_associated has the wrong form (%s) at DIE 0x%x"),
23030 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23031 to_underlying (die->sect_off));
23034 /* Read DW_AT_data_location and set in type. */
23035 attr = dwarf2_attr (die, DW_AT_data_location, cu);
23036 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23037 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type, objfile);
23039 if (dwarf2_per_objfile->die_type_hash == NULL)
23041 dwarf2_per_objfile->die_type_hash =
23042 htab_create_alloc_ex (127,
23043 per_cu_offset_and_type_hash,
23044 per_cu_offset_and_type_eq,
23046 &objfile->objfile_obstack,
23047 hashtab_obstack_allocate,
23048 dummy_obstack_deallocate);
23051 ofs.per_cu = cu->per_cu;
23052 ofs.sect_off = die->sect_off;
23054 slot = (struct dwarf2_per_cu_offset_and_type **)
23055 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
23057 complaint (&symfile_complaints,
23058 _("A problem internal to GDB: DIE 0x%x has type already set"),
23059 to_underlying (die->sect_off));
23060 *slot = XOBNEW (&objfile->objfile_obstack,
23061 struct dwarf2_per_cu_offset_and_type);
23066 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
23067 or return NULL if the die does not have a saved type. */
23069 static struct type *
23070 get_die_type_at_offset (sect_offset sect_off,
23071 struct dwarf2_per_cu_data *per_cu)
23073 struct dwarf2_per_cu_offset_and_type *slot, ofs;
23075 if (dwarf2_per_objfile->die_type_hash == NULL)
23078 ofs.per_cu = per_cu;
23079 ofs.sect_off = sect_off;
23080 slot = ((struct dwarf2_per_cu_offset_and_type *)
23081 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
23088 /* Look up the type for DIE in CU in die_type_hash,
23089 or return NULL if DIE does not have a saved type. */
23091 static struct type *
23092 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
23094 return get_die_type_at_offset (die->sect_off, cu->per_cu);
23097 /* Add a dependence relationship from CU to REF_PER_CU. */
23100 dwarf2_add_dependence (struct dwarf2_cu *cu,
23101 struct dwarf2_per_cu_data *ref_per_cu)
23105 if (cu->dependencies == NULL)
23107 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
23108 NULL, &cu->comp_unit_obstack,
23109 hashtab_obstack_allocate,
23110 dummy_obstack_deallocate);
23112 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
23114 *slot = ref_per_cu;
23117 /* Subroutine of dwarf2_mark to pass to htab_traverse.
23118 Set the mark field in every compilation unit in the
23119 cache that we must keep because we are keeping CU. */
23122 dwarf2_mark_helper (void **slot, void *data)
23124 struct dwarf2_per_cu_data *per_cu;
23126 per_cu = (struct dwarf2_per_cu_data *) *slot;
23128 /* cu->dependencies references may not yet have been ever read if QUIT aborts
23129 reading of the chain. As such dependencies remain valid it is not much
23130 useful to track and undo them during QUIT cleanups. */
23131 if (per_cu->cu == NULL)
23134 if (per_cu->cu->mark)
23136 per_cu->cu->mark = 1;
23138 if (per_cu->cu->dependencies != NULL)
23139 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
23144 /* Set the mark field in CU and in every other compilation unit in the
23145 cache that we must keep because we are keeping CU. */
23148 dwarf2_mark (struct dwarf2_cu *cu)
23153 if (cu->dependencies != NULL)
23154 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
23158 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
23162 per_cu->cu->mark = 0;
23163 per_cu = per_cu->cu->read_in_chain;
23167 /* Trivial hash function for partial_die_info: the hash value of a DIE
23168 is its offset in .debug_info for this objfile. */
23171 partial_die_hash (const void *item)
23173 const struct partial_die_info *part_die
23174 = (const struct partial_die_info *) item;
23176 return to_underlying (part_die->sect_off);
23179 /* Trivial comparison function for partial_die_info structures: two DIEs
23180 are equal if they have the same offset. */
23183 partial_die_eq (const void *item_lhs, const void *item_rhs)
23185 const struct partial_die_info *part_die_lhs
23186 = (const struct partial_die_info *) item_lhs;
23187 const struct partial_die_info *part_die_rhs
23188 = (const struct partial_die_info *) item_rhs;
23190 return part_die_lhs->sect_off == part_die_rhs->sect_off;
23193 static struct cmd_list_element *set_dwarf_cmdlist;
23194 static struct cmd_list_element *show_dwarf_cmdlist;
23197 set_dwarf_cmd (char *args, int from_tty)
23199 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
23204 show_dwarf_cmd (char *args, int from_tty)
23206 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
23209 /* Free data associated with OBJFILE, if necessary. */
23212 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
23214 struct dwarf2_per_objfile *data = (struct dwarf2_per_objfile *) d;
23217 /* Make sure we don't accidentally use dwarf2_per_objfile while
23219 dwarf2_per_objfile = NULL;
23221 for (ix = 0; ix < data->n_comp_units; ++ix)
23222 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
23224 for (ix = 0; ix < data->n_type_units; ++ix)
23225 VEC_free (dwarf2_per_cu_ptr,
23226 data->all_type_units[ix]->per_cu.imported_symtabs);
23227 xfree (data->all_type_units);
23229 VEC_free (dwarf2_section_info_def, data->types);
23231 if (data->dwo_files)
23232 free_dwo_files (data->dwo_files, objfile);
23233 if (data->dwp_file)
23234 gdb_bfd_unref (data->dwp_file->dbfd);
23236 if (data->dwz_file && data->dwz_file->dwz_bfd)
23237 gdb_bfd_unref (data->dwz_file->dwz_bfd);
23241 /* The "save gdb-index" command. */
23243 /* In-memory buffer to prepare data to be written later to a file. */
23247 /* Copy DATA to the end of the buffer. */
23248 template<typename T>
23249 void append_data (const T &data)
23251 std::copy (reinterpret_cast<const gdb_byte *> (&data),
23252 reinterpret_cast<const gdb_byte *> (&data + 1),
23253 grow (sizeof (data)));
23256 /* Copy CSTR (a zero-terminated string) to the end of buffer. The
23257 terminating zero is appended too. */
23258 void append_cstr0 (const char *cstr)
23260 const size_t size = strlen (cstr) + 1;
23261 std::copy (cstr, cstr + size, grow (size));
23264 /* Accept a host-format integer in VAL and append it to the buffer
23265 as a target-format integer which is LEN bytes long. */
23266 void append_uint (size_t len, bfd_endian byte_order, ULONGEST val)
23268 ::store_unsigned_integer (grow (len), len, byte_order, val);
23271 /* Return the size of the buffer. */
23272 size_t size () const
23274 return m_vec.size ();
23277 /* Write the buffer to FILE. */
23278 void file_write (FILE *file) const
23280 if (::fwrite (m_vec.data (), 1, m_vec.size (), file) != m_vec.size ())
23281 error (_("couldn't write data to file"));
23285 /* Grow SIZE bytes at the end of the buffer. Returns a pointer to
23286 the start of the new block. */
23287 gdb_byte *grow (size_t size)
23289 m_vec.resize (m_vec.size () + size);
23290 return &*m_vec.end () - size;
23293 gdb::byte_vector m_vec;
23296 /* An entry in the symbol table. */
23297 struct symtab_index_entry
23299 /* The name of the symbol. */
23301 /* The offset of the name in the constant pool. */
23302 offset_type index_offset;
23303 /* A sorted vector of the indices of all the CUs that hold an object
23305 std::vector<offset_type> cu_indices;
23308 /* The symbol table. This is a power-of-2-sized hash table. */
23309 struct mapped_symtab
23313 data.resize (1024);
23316 offset_type n_elements = 0;
23317 std::vector<symtab_index_entry> data;
23320 /* Find a slot in SYMTAB for the symbol NAME. Returns a reference to
23323 Function is used only during write_hash_table so no index format backward
23324 compatibility is needed. */
23326 static symtab_index_entry &
23327 find_slot (struct mapped_symtab *symtab, const char *name)
23329 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
23331 index = hash & (symtab->data.size () - 1);
23332 step = ((hash * 17) & (symtab->data.size () - 1)) | 1;
23336 if (symtab->data[index].name == NULL
23337 || strcmp (name, symtab->data[index].name) == 0)
23338 return symtab->data[index];
23339 index = (index + step) & (symtab->data.size () - 1);
23343 /* Expand SYMTAB's hash table. */
23346 hash_expand (struct mapped_symtab *symtab)
23348 auto old_entries = std::move (symtab->data);
23350 symtab->data.clear ();
23351 symtab->data.resize (old_entries.size () * 2);
23353 for (auto &it : old_entries)
23354 if (it.name != NULL)
23356 auto &ref = find_slot (symtab, it.name);
23357 ref = std::move (it);
23361 /* Add an entry to SYMTAB. NAME is the name of the symbol.
23362 CU_INDEX is the index of the CU in which the symbol appears.
23363 IS_STATIC is one if the symbol is static, otherwise zero (global). */
23366 add_index_entry (struct mapped_symtab *symtab, const char *name,
23367 int is_static, gdb_index_symbol_kind kind,
23368 offset_type cu_index)
23370 offset_type cu_index_and_attrs;
23372 ++symtab->n_elements;
23373 if (4 * symtab->n_elements / 3 >= symtab->data.size ())
23374 hash_expand (symtab);
23376 symtab_index_entry &slot = find_slot (symtab, name);
23377 if (slot.name == NULL)
23380 /* index_offset is set later. */
23383 cu_index_and_attrs = 0;
23384 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
23385 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
23386 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
23388 /* We don't want to record an index value twice as we want to avoid the
23390 We process all global symbols and then all static symbols
23391 (which would allow us to avoid the duplication by only having to check
23392 the last entry pushed), but a symbol could have multiple kinds in one CU.
23393 To keep things simple we don't worry about the duplication here and
23394 sort and uniqufy the list after we've processed all symbols. */
23395 slot.cu_indices.push_back (cu_index_and_attrs);
23398 /* Sort and remove duplicates of all symbols' cu_indices lists. */
23401 uniquify_cu_indices (struct mapped_symtab *symtab)
23403 for (auto &entry : symtab->data)
23405 if (entry.name != NULL && !entry.cu_indices.empty ())
23407 auto &cu_indices = entry.cu_indices;
23408 std::sort (cu_indices.begin (), cu_indices.end ());
23409 auto from = std::unique (cu_indices.begin (), cu_indices.end ());
23410 cu_indices.erase (from, cu_indices.end ());
23415 /* A form of 'const char *' suitable for container keys. Only the
23416 pointer is stored. The strings themselves are compared, not the
23421 c_str_view (const char *cstr)
23425 bool operator== (const c_str_view &other) const
23427 return strcmp (m_cstr, other.m_cstr) == 0;
23431 friend class c_str_view_hasher;
23432 const char *const m_cstr;
23435 /* A std::unordered_map::hasher for c_str_view that uses the right
23436 hash function for strings in a mapped index. */
23437 class c_str_view_hasher
23440 size_t operator () (const c_str_view &x) const
23442 return mapped_index_string_hash (INT_MAX, x.m_cstr);
23446 /* A std::unordered_map::hasher for std::vector<>. */
23447 template<typename T>
23448 class vector_hasher
23451 size_t operator () (const std::vector<T> &key) const
23453 return iterative_hash (key.data (),
23454 sizeof (key.front ()) * key.size (), 0);
23458 /* Write the mapped hash table SYMTAB to the data buffer OUTPUT, with
23459 constant pool entries going into the data buffer CPOOL. */
23462 write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
23465 /* Elements are sorted vectors of the indices of all the CUs that
23466 hold an object of this name. */
23467 std::unordered_map<std::vector<offset_type>, offset_type,
23468 vector_hasher<offset_type>>
23471 /* We add all the index vectors to the constant pool first, to
23472 ensure alignment is ok. */
23473 for (symtab_index_entry &entry : symtab->data)
23475 if (entry.name == NULL)
23477 gdb_assert (entry.index_offset == 0);
23479 /* Finding before inserting is faster than always trying to
23480 insert, because inserting always allocates a node, does the
23481 lookup, and then destroys the new node if another node
23482 already had the same key. C++17 try_emplace will avoid
23485 = symbol_hash_table.find (entry.cu_indices);
23486 if (found != symbol_hash_table.end ())
23488 entry.index_offset = found->second;
23492 symbol_hash_table.emplace (entry.cu_indices, cpool.size ());
23493 entry.index_offset = cpool.size ();
23494 cpool.append_data (MAYBE_SWAP (entry.cu_indices.size ()));
23495 for (const auto index : entry.cu_indices)
23496 cpool.append_data (MAYBE_SWAP (index));
23500 /* Now write out the hash table. */
23501 std::unordered_map<c_str_view, offset_type, c_str_view_hasher> str_table;
23502 for (const auto &entry : symtab->data)
23504 offset_type str_off, vec_off;
23506 if (entry.name != NULL)
23508 const auto insertpair = str_table.emplace (entry.name, cpool.size ());
23509 if (insertpair.second)
23510 cpool.append_cstr0 (entry.name);
23511 str_off = insertpair.first->second;
23512 vec_off = entry.index_offset;
23516 /* While 0 is a valid constant pool index, it is not valid
23517 to have 0 for both offsets. */
23522 output.append_data (MAYBE_SWAP (str_off));
23523 output.append_data (MAYBE_SWAP (vec_off));
23527 typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
23529 /* Helper struct for building the address table. */
23530 struct addrmap_index_data
23532 addrmap_index_data (data_buf &addr_vec_, psym_index_map &cu_index_htab_)
23533 : addr_vec (addr_vec_), cu_index_htab (cu_index_htab_)
23536 struct objfile *objfile;
23537 data_buf &addr_vec;
23538 psym_index_map &cu_index_htab;
23540 /* Non-zero if the previous_* fields are valid.
23541 We can't write an entry until we see the next entry (since it is only then
23542 that we know the end of the entry). */
23543 int previous_valid;
23544 /* Index of the CU in the table of all CUs in the index file. */
23545 unsigned int previous_cu_index;
23546 /* Start address of the CU. */
23547 CORE_ADDR previous_cu_start;
23550 /* Write an address entry to ADDR_VEC. */
23553 add_address_entry (struct objfile *objfile, data_buf &addr_vec,
23554 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
23556 CORE_ADDR baseaddr;
23558 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
23560 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, start - baseaddr);
23561 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, end - baseaddr);
23562 addr_vec.append_data (MAYBE_SWAP (cu_index));
23565 /* Worker function for traversing an addrmap to build the address table. */
23568 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
23570 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
23571 struct partial_symtab *pst = (struct partial_symtab *) obj;
23573 if (data->previous_valid)
23574 add_address_entry (data->objfile, data->addr_vec,
23575 data->previous_cu_start, start_addr,
23576 data->previous_cu_index);
23578 data->previous_cu_start = start_addr;
23581 const auto it = data->cu_index_htab.find (pst);
23582 gdb_assert (it != data->cu_index_htab.cend ());
23583 data->previous_cu_index = it->second;
23584 data->previous_valid = 1;
23587 data->previous_valid = 0;
23592 /* Write OBJFILE's address map to ADDR_VEC.
23593 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
23594 in the index file. */
23597 write_address_map (struct objfile *objfile, data_buf &addr_vec,
23598 psym_index_map &cu_index_htab)
23600 struct addrmap_index_data addrmap_index_data (addr_vec, cu_index_htab);
23602 /* When writing the address table, we have to cope with the fact that
23603 the addrmap iterator only provides the start of a region; we have to
23604 wait until the next invocation to get the start of the next region. */
23606 addrmap_index_data.objfile = objfile;
23607 addrmap_index_data.previous_valid = 0;
23609 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
23610 &addrmap_index_data);
23612 /* It's highly unlikely the last entry (end address = 0xff...ff)
23613 is valid, but we should still handle it.
23614 The end address is recorded as the start of the next region, but that
23615 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
23617 if (addrmap_index_data.previous_valid)
23618 add_address_entry (objfile, addr_vec,
23619 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
23620 addrmap_index_data.previous_cu_index);
23623 /* Return the symbol kind of PSYM. */
23625 static gdb_index_symbol_kind
23626 symbol_kind (struct partial_symbol *psym)
23628 domain_enum domain = PSYMBOL_DOMAIN (psym);
23629 enum address_class aclass = PSYMBOL_CLASS (psym);
23637 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
23639 return GDB_INDEX_SYMBOL_KIND_TYPE;
23641 case LOC_CONST_BYTES:
23642 case LOC_OPTIMIZED_OUT:
23644 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23646 /* Note: It's currently impossible to recognize psyms as enum values
23647 short of reading the type info. For now punt. */
23648 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23650 /* There are other LOC_FOO values that one might want to classify
23651 as variables, but dwarf2read.c doesn't currently use them. */
23652 return GDB_INDEX_SYMBOL_KIND_OTHER;
23654 case STRUCT_DOMAIN:
23655 return GDB_INDEX_SYMBOL_KIND_TYPE;
23657 return GDB_INDEX_SYMBOL_KIND_OTHER;
23661 /* Add a list of partial symbols to SYMTAB. */
23664 write_psymbols (struct mapped_symtab *symtab,
23665 std::unordered_set<partial_symbol *> &psyms_seen,
23666 struct partial_symbol **psymp,
23668 offset_type cu_index,
23671 for (; count-- > 0; ++psymp)
23673 struct partial_symbol *psym = *psymp;
23675 if (SYMBOL_LANGUAGE (psym) == language_ada)
23676 error (_("Ada is not currently supported by the index"));
23678 /* Only add a given psymbol once. */
23679 if (psyms_seen.insert (psym).second)
23681 gdb_index_symbol_kind kind = symbol_kind (psym);
23683 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
23684 is_static, kind, cu_index);
23689 /* A helper struct used when iterating over debug_types. */
23690 struct signatured_type_index_data
23692 signatured_type_index_data (data_buf &types_list_,
23693 std::unordered_set<partial_symbol *> &psyms_seen_)
23694 : types_list (types_list_), psyms_seen (psyms_seen_)
23697 struct objfile *objfile;
23698 struct mapped_symtab *symtab;
23699 data_buf &types_list;
23700 std::unordered_set<partial_symbol *> &psyms_seen;
23704 /* A helper function that writes a single signatured_type to an
23708 write_one_signatured_type (void **slot, void *d)
23710 struct signatured_type_index_data *info
23711 = (struct signatured_type_index_data *) d;
23712 struct signatured_type *entry = (struct signatured_type *) *slot;
23713 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
23715 write_psymbols (info->symtab,
23717 info->objfile->global_psymbols.list
23718 + psymtab->globals_offset,
23719 psymtab->n_global_syms, info->cu_index,
23721 write_psymbols (info->symtab,
23723 info->objfile->static_psymbols.list
23724 + psymtab->statics_offset,
23725 psymtab->n_static_syms, info->cu_index,
23728 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
23729 to_underlying (entry->per_cu.sect_off));
23730 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
23731 to_underlying (entry->type_offset_in_tu));
23732 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE, entry->signature);
23739 /* Recurse into all "included" dependencies and count their symbols as
23740 if they appeared in this psymtab. */
23743 recursively_count_psymbols (struct partial_symtab *psymtab,
23744 size_t &psyms_seen)
23746 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
23747 if (psymtab->dependencies[i]->user != NULL)
23748 recursively_count_psymbols (psymtab->dependencies[i],
23751 psyms_seen += psymtab->n_global_syms;
23752 psyms_seen += psymtab->n_static_syms;
23755 /* Recurse into all "included" dependencies and write their symbols as
23756 if they appeared in this psymtab. */
23759 recursively_write_psymbols (struct objfile *objfile,
23760 struct partial_symtab *psymtab,
23761 struct mapped_symtab *symtab,
23762 std::unordered_set<partial_symbol *> &psyms_seen,
23763 offset_type cu_index)
23767 for (i = 0; i < psymtab->number_of_dependencies; ++i)
23768 if (psymtab->dependencies[i]->user != NULL)
23769 recursively_write_psymbols (objfile, psymtab->dependencies[i],
23770 symtab, psyms_seen, cu_index);
23772 write_psymbols (symtab,
23774 objfile->global_psymbols.list + psymtab->globals_offset,
23775 psymtab->n_global_syms, cu_index,
23777 write_psymbols (symtab,
23779 objfile->static_psymbols.list + psymtab->statics_offset,
23780 psymtab->n_static_syms, cu_index,
23784 /* Create an index file for OBJFILE in the directory DIR. */
23787 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
23789 if (dwarf2_per_objfile->using_index)
23790 error (_("Cannot use an index to create the index"));
23792 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
23793 error (_("Cannot make an index when the file has multiple .debug_types sections"));
23795 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
23799 if (stat (objfile_name (objfile), &st) < 0)
23800 perror_with_name (objfile_name (objfile));
23802 std::string filename (std::string (dir) + SLASH_STRING
23803 + lbasename (objfile_name (objfile)) + INDEX_SUFFIX);
23805 FILE *out_file = gdb_fopen_cloexec (filename.c_str (), "wb").release ();
23807 error (_("Can't open `%s' for writing"), filename.c_str ());
23809 /* Order matters here; we want FILE to be closed before FILENAME is
23810 unlinked, because on MS-Windows one cannot delete a file that is
23811 still open. (Don't call anything here that might throw until
23812 file_closer is created.) */
23813 gdb::unlinker unlink_file (filename.c_str ());
23814 gdb_file_up close_out_file (out_file);
23816 mapped_symtab symtab;
23819 /* While we're scanning CU's create a table that maps a psymtab pointer
23820 (which is what addrmap records) to its index (which is what is recorded
23821 in the index file). This will later be needed to write the address
23823 psym_index_map cu_index_htab;
23824 cu_index_htab.reserve (dwarf2_per_objfile->n_comp_units);
23826 /* The CU list is already sorted, so we don't need to do additional
23827 work here. Also, the debug_types entries do not appear in
23828 all_comp_units, but only in their own hash table. */
23830 /* The psyms_seen set is potentially going to be largish (~40k
23831 elements when indexing a -g3 build of GDB itself). Estimate the
23832 number of elements in order to avoid too many rehashes, which
23833 require rebuilding buckets and thus many trips to
23835 size_t psyms_count = 0;
23836 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
23838 struct dwarf2_per_cu_data *per_cu
23839 = dwarf2_per_objfile->all_comp_units[i];
23840 struct partial_symtab *psymtab = per_cu->v.psymtab;
23842 if (psymtab != NULL && psymtab->user == NULL)
23843 recursively_count_psymbols (psymtab, psyms_count);
23845 /* Generating an index for gdb itself shows a ratio of
23846 TOTAL_SEEN_SYMS/UNIQUE_SYMS or ~5. 4 seems like a good bet. */
23847 std::unordered_set<partial_symbol *> psyms_seen (psyms_count / 4);
23848 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
23850 struct dwarf2_per_cu_data *per_cu
23851 = dwarf2_per_objfile->all_comp_units[i];
23852 struct partial_symtab *psymtab = per_cu->v.psymtab;
23854 /* CU of a shared file from 'dwz -m' may be unused by this main file.
23855 It may be referenced from a local scope but in such case it does not
23856 need to be present in .gdb_index. */
23857 if (psymtab == NULL)
23860 if (psymtab->user == NULL)
23861 recursively_write_psymbols (objfile, psymtab, &symtab,
23864 const auto insertpair = cu_index_htab.emplace (psymtab, i);
23865 gdb_assert (insertpair.second);
23867 cu_list.append_uint (8, BFD_ENDIAN_LITTLE,
23868 to_underlying (per_cu->sect_off));
23869 cu_list.append_uint (8, BFD_ENDIAN_LITTLE, per_cu->length);
23872 /* Dump the address map. */
23874 write_address_map (objfile, addr_vec, cu_index_htab);
23876 /* Write out the .debug_type entries, if any. */
23877 data_buf types_cu_list;
23878 if (dwarf2_per_objfile->signatured_types)
23880 signatured_type_index_data sig_data (types_cu_list,
23883 sig_data.objfile = objfile;
23884 sig_data.symtab = &symtab;
23885 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
23886 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
23887 write_one_signatured_type, &sig_data);
23890 /* Now that we've processed all symbols we can shrink their cu_indices
23892 uniquify_cu_indices (&symtab);
23894 data_buf symtab_vec, constant_pool;
23895 write_hash_table (&symtab, symtab_vec, constant_pool);
23898 const offset_type size_of_contents = 6 * sizeof (offset_type);
23899 offset_type total_len = size_of_contents;
23901 /* The version number. */
23902 contents.append_data (MAYBE_SWAP (8));
23904 /* The offset of the CU list from the start of the file. */
23905 contents.append_data (MAYBE_SWAP (total_len));
23906 total_len += cu_list.size ();
23908 /* The offset of the types CU list from the start of the file. */
23909 contents.append_data (MAYBE_SWAP (total_len));
23910 total_len += types_cu_list.size ();
23912 /* The offset of the address table from the start of the file. */
23913 contents.append_data (MAYBE_SWAP (total_len));
23914 total_len += addr_vec.size ();
23916 /* The offset of the symbol table from the start of the file. */
23917 contents.append_data (MAYBE_SWAP (total_len));
23918 total_len += symtab_vec.size ();
23920 /* The offset of the constant pool from the start of the file. */
23921 contents.append_data (MAYBE_SWAP (total_len));
23922 total_len += constant_pool.size ();
23924 gdb_assert (contents.size () == size_of_contents);
23926 contents.file_write (out_file);
23927 cu_list.file_write (out_file);
23928 types_cu_list.file_write (out_file);
23929 addr_vec.file_write (out_file);
23930 symtab_vec.file_write (out_file);
23931 constant_pool.file_write (out_file);
23933 /* We want to keep the file. */
23934 unlink_file.keep ();
23937 /* Implementation of the `save gdb-index' command.
23939 Note that the file format used by this command is documented in the
23940 GDB manual. Any changes here must be documented there. */
23943 save_gdb_index_command (char *arg, int from_tty)
23945 struct objfile *objfile;
23948 error (_("usage: save gdb-index DIRECTORY"));
23950 ALL_OBJFILES (objfile)
23954 /* If the objfile does not correspond to an actual file, skip it. */
23955 if (stat (objfile_name (objfile), &st) < 0)
23959 = (struct dwarf2_per_objfile *) objfile_data (objfile,
23960 dwarf2_objfile_data_key);
23961 if (dwarf2_per_objfile)
23966 write_psymtabs_to_index (objfile, arg);
23968 CATCH (except, RETURN_MASK_ERROR)
23970 exception_fprintf (gdb_stderr, except,
23971 _("Error while writing index for `%s': "),
23972 objfile_name (objfile));
23981 int dwarf_always_disassemble;
23984 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
23985 struct cmd_list_element *c, const char *value)
23987 fprintf_filtered (file,
23988 _("Whether to always disassemble "
23989 "DWARF expressions is %s.\n"),
23994 show_check_physname (struct ui_file *file, int from_tty,
23995 struct cmd_list_element *c, const char *value)
23997 fprintf_filtered (file,
23998 _("Whether to check \"physname\" is %s.\n"),
24002 void _initialize_dwarf2_read (void);
24005 _initialize_dwarf2_read (void)
24007 struct cmd_list_element *c;
24009 dwarf2_objfile_data_key
24010 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
24012 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
24013 Set DWARF specific variables.\n\
24014 Configure DWARF variables such as the cache size"),
24015 &set_dwarf_cmdlist, "maintenance set dwarf ",
24016 0/*allow-unknown*/, &maintenance_set_cmdlist);
24018 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
24019 Show DWARF specific variables\n\
24020 Show DWARF variables such as the cache size"),
24021 &show_dwarf_cmdlist, "maintenance show dwarf ",
24022 0/*allow-unknown*/, &maintenance_show_cmdlist);
24024 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
24025 &dwarf_max_cache_age, _("\
24026 Set the upper bound on the age of cached DWARF compilation units."), _("\
24027 Show the upper bound on the age of cached DWARF compilation units."), _("\
24028 A higher limit means that cached compilation units will be stored\n\
24029 in memory longer, and more total memory will be used. Zero disables\n\
24030 caching, which can slow down startup."),
24032 show_dwarf_max_cache_age,
24033 &set_dwarf_cmdlist,
24034 &show_dwarf_cmdlist);
24036 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
24037 &dwarf_always_disassemble, _("\
24038 Set whether `info address' always disassembles DWARF expressions."), _("\
24039 Show whether `info address' always disassembles DWARF expressions."), _("\
24040 When enabled, DWARF expressions are always printed in an assembly-like\n\
24041 syntax. When disabled, expressions will be printed in a more\n\
24042 conversational style, when possible."),
24044 show_dwarf_always_disassemble,
24045 &set_dwarf_cmdlist,
24046 &show_dwarf_cmdlist);
24048 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
24049 Set debugging of the DWARF reader."), _("\
24050 Show debugging of the DWARF reader."), _("\
24051 When enabled (non-zero), debugging messages are printed during DWARF\n\
24052 reading and symtab expansion. A value of 1 (one) provides basic\n\
24053 information. A value greater than 1 provides more verbose information."),
24056 &setdebuglist, &showdebuglist);
24058 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
24059 Set debugging of the DWARF DIE reader."), _("\
24060 Show debugging of the DWARF DIE reader."), _("\
24061 When enabled (non-zero), DIEs are dumped after they are read in.\n\
24062 The value is the maximum depth to print."),
24065 &setdebuglist, &showdebuglist);
24067 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
24068 Set debugging of the dwarf line reader."), _("\
24069 Show debugging of the dwarf line reader."), _("\
24070 When enabled (non-zero), line number entries are dumped as they are read in.\n\
24071 A value of 1 (one) provides basic information.\n\
24072 A value greater than 1 provides more verbose information."),
24075 &setdebuglist, &showdebuglist);
24077 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
24078 Set cross-checking of \"physname\" code against demangler."), _("\
24079 Show cross-checking of \"physname\" code against demangler."), _("\
24080 When enabled, GDB's internal \"physname\" code is checked against\n\
24082 NULL, show_check_physname,
24083 &setdebuglist, &showdebuglist);
24085 add_setshow_boolean_cmd ("use-deprecated-index-sections",
24086 no_class, &use_deprecated_index_sections, _("\
24087 Set whether to use deprecated gdb_index sections."), _("\
24088 Show whether to use deprecated gdb_index sections."), _("\
24089 When enabled, deprecated .gdb_index sections are used anyway.\n\
24090 Normally they are ignored either because of a missing feature or\n\
24091 performance issue.\n\
24092 Warning: This option must be enabled before gdb reads the file."),
24095 &setlist, &showlist);
24097 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
24099 Save a gdb-index file.\n\
24100 Usage: save gdb-index DIRECTORY"),
24102 set_cmd_completer (c, filename_completer);
24104 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
24105 &dwarf2_locexpr_funcs);
24106 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
24107 &dwarf2_loclist_funcs);
24109 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
24110 &dwarf2_block_frame_base_locexpr_funcs);
24111 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
24112 &dwarf2_block_frame_base_loclist_funcs);