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;
549 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
550 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
551 this is the DW_TAG_compile_unit die for this CU. We'll hold on
552 to the line header as long as this DIE is being processed. See
553 process_die_scope. */
554 die_info *line_header_die_owner;
556 /* A list of methods which need to have physnames computed
557 after all type information has been read. */
558 VEC (delayed_method_info) *method_list;
560 /* To be copied to symtab->call_site_htab. */
561 htab_t call_site_htab;
563 /* Non-NULL if this CU came from a DWO file.
564 There is an invariant here that is important to remember:
565 Except for attributes copied from the top level DIE in the "main"
566 (or "stub") file in preparation for reading the DWO file
567 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
568 Either there isn't a DWO file (in which case this is NULL and the point
569 is moot), or there is and either we're not going to read it (in which
570 case this is NULL) or there is and we are reading it (in which case this
572 struct dwo_unit *dwo_unit;
574 /* The DW_AT_addr_base attribute if present, zero otherwise
575 (zero is a valid value though).
576 Note this value comes from the Fission stub CU/TU's DIE. */
579 /* The DW_AT_ranges_base attribute if present, zero otherwise
580 (zero is a valid value though).
581 Note this value comes from the Fission stub CU/TU's DIE.
582 Also note that the value is zero in the non-DWO case so this value can
583 be used without needing to know whether DWO files are in use or not.
584 N.B. This does not apply to DW_AT_ranges appearing in
585 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
586 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
587 DW_AT_ranges_base *would* have to be applied, and we'd have to care
588 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
589 ULONGEST ranges_base;
591 /* Mark used when releasing cached dies. */
592 unsigned int mark : 1;
594 /* This CU references .debug_loc. See the symtab->locations_valid field.
595 This test is imperfect as there may exist optimized debug code not using
596 any location list and still facing inlining issues if handled as
597 unoptimized code. For a future better test see GCC PR other/32998. */
598 unsigned int has_loclist : 1;
600 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
601 if all the producer_is_* fields are valid. This information is cached
602 because profiling CU expansion showed excessive time spent in
603 producer_is_gxx_lt_4_6. */
604 unsigned int checked_producer : 1;
605 unsigned int producer_is_gxx_lt_4_6 : 1;
606 unsigned int producer_is_gcc_lt_4_3 : 1;
607 unsigned int producer_is_icc : 1;
609 /* When set, the file that we're processing is known to have
610 debugging info for C++ namespaces. GCC 3.3.x did not produce
611 this information, but later versions do. */
613 unsigned int processing_has_namespace_info : 1;
616 /* Persistent data held for a compilation unit, even when not
617 processing it. We put a pointer to this structure in the
618 read_symtab_private field of the psymtab. */
620 struct dwarf2_per_cu_data
622 /* The start offset and length of this compilation unit.
623 NOTE: Unlike comp_unit_head.length, this length includes
625 If the DIE refers to a DWO file, this is always of the original die,
627 sect_offset sect_off;
630 /* DWARF standard version this data has been read from (such as 4 or 5). */
633 /* Flag indicating this compilation unit will be read in before
634 any of the current compilation units are processed. */
635 unsigned int queued : 1;
637 /* This flag will be set when reading partial DIEs if we need to load
638 absolutely all DIEs for this compilation unit, instead of just the ones
639 we think are interesting. It gets set if we look for a DIE in the
640 hash table and don't find it. */
641 unsigned int load_all_dies : 1;
643 /* Non-zero if this CU is from .debug_types.
644 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
646 unsigned int is_debug_types : 1;
648 /* Non-zero if this CU is from the .dwz file. */
649 unsigned int is_dwz : 1;
651 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
652 This flag is only valid if is_debug_types is true.
653 We can't read a CU directly from a DWO file: There are required
654 attributes in the stub. */
655 unsigned int reading_dwo_directly : 1;
657 /* Non-zero if the TU has been read.
658 This is used to assist the "Stay in DWO Optimization" for Fission:
659 When reading a DWO, it's faster to read TUs from the DWO instead of
660 fetching them from random other DWOs (due to comdat folding).
661 If the TU has already been read, the optimization is unnecessary
662 (and unwise - we don't want to change where gdb thinks the TU lives
664 This flag is only valid if is_debug_types is true. */
665 unsigned int tu_read : 1;
667 /* The section this CU/TU lives in.
668 If the DIE refers to a DWO file, this is always the original die,
670 struct dwarf2_section_info *section;
672 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
673 of the CU cache it gets reset to NULL again. This is left as NULL for
674 dummy CUs (a CU header, but nothing else). */
675 struct dwarf2_cu *cu;
677 /* The corresponding objfile.
678 Normally we can get the objfile from dwarf2_per_objfile.
679 However we can enter this file with just a "per_cu" handle. */
680 struct objfile *objfile;
682 /* When dwarf2_per_objfile->using_index is true, the 'quick' field
683 is active. Otherwise, the 'psymtab' field is active. */
686 /* The partial symbol table associated with this compilation unit,
687 or NULL for unread partial units. */
688 struct partial_symtab *psymtab;
690 /* Data needed by the "quick" functions. */
691 struct dwarf2_per_cu_quick_data *quick;
694 /* The CUs we import using DW_TAG_imported_unit. This is filled in
695 while reading psymtabs, used to compute the psymtab dependencies,
696 and then cleared. Then it is filled in again while reading full
697 symbols, and only deleted when the objfile is destroyed.
699 This is also used to work around a difference between the way gold
700 generates .gdb_index version <=7 and the way gdb does. Arguably this
701 is a gold bug. For symbols coming from TUs, gold records in the index
702 the CU that includes the TU instead of the TU itself. This breaks
703 dw2_lookup_symbol: It assumes that if the index says symbol X lives
704 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
705 will find X. Alas TUs live in their own symtab, so after expanding CU Y
706 we need to look in TU Z to find X. Fortunately, this is akin to
707 DW_TAG_imported_unit, so we just use the same mechanism: For
708 .gdb_index version <=7 this also records the TUs that the CU referred
709 to. Concurrently with this change gdb was modified to emit version 8
710 indices so we only pay a price for gold generated indices.
711 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
712 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
715 /* Entry in the signatured_types hash table. */
717 struct signatured_type
719 /* The "per_cu" object of this type.
720 This struct is used iff per_cu.is_debug_types.
721 N.B.: This is the first member so that it's easy to convert pointers
723 struct dwarf2_per_cu_data per_cu;
725 /* The type's signature. */
728 /* Offset in the TU of the type's DIE, as read from the TU header.
729 If this TU is a DWO stub and the definition lives in a DWO file
730 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
731 cu_offset type_offset_in_tu;
733 /* Offset in the section of the type's DIE.
734 If the definition lives in a DWO file, this is the offset in the
735 .debug_types.dwo section.
736 The value is zero until the actual value is known.
737 Zero is otherwise not a valid section offset. */
738 sect_offset type_offset_in_section;
740 /* Type units are grouped by their DW_AT_stmt_list entry so that they
741 can share them. This points to the containing symtab. */
742 struct type_unit_group *type_unit_group;
745 The first time we encounter this type we fully read it in and install it
746 in the symbol tables. Subsequent times we only need the type. */
749 /* Containing DWO unit.
750 This field is valid iff per_cu.reading_dwo_directly. */
751 struct dwo_unit *dwo_unit;
754 typedef struct signatured_type *sig_type_ptr;
755 DEF_VEC_P (sig_type_ptr);
757 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
758 This includes type_unit_group and quick_file_names. */
760 struct stmt_list_hash
762 /* The DWO unit this table is from or NULL if there is none. */
763 struct dwo_unit *dwo_unit;
765 /* Offset in .debug_line or .debug_line.dwo. */
766 sect_offset line_sect_off;
769 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
770 an object of this type. */
772 struct type_unit_group
774 /* dwarf2read.c's main "handle" on a TU symtab.
775 To simplify things we create an artificial CU that "includes" all the
776 type units using this stmt_list so that the rest of the code still has
777 a "per_cu" handle on the symtab.
778 This PER_CU is recognized by having no section. */
779 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
780 struct dwarf2_per_cu_data per_cu;
782 /* The TUs that share this DW_AT_stmt_list entry.
783 This is added to while parsing type units to build partial symtabs,
784 and is deleted afterwards and not used again. */
785 VEC (sig_type_ptr) *tus;
787 /* The compunit symtab.
788 Type units in a group needn't all be defined in the same source file,
789 so we create an essentially anonymous symtab as the compunit symtab. */
790 struct compunit_symtab *compunit_symtab;
792 /* The data used to construct the hash key. */
793 struct stmt_list_hash hash;
795 /* The number of symtabs from the line header.
796 The value here must match line_header.num_file_names. */
797 unsigned int num_symtabs;
799 /* The symbol tables for this TU (obtained from the files listed in
801 WARNING: The order of entries here must match the order of entries
802 in the line header. After the first TU using this type_unit_group, the
803 line header for the subsequent TUs is recreated from this. This is done
804 because we need to use the same symtabs for each TU using the same
805 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
806 there's no guarantee the line header doesn't have duplicate entries. */
807 struct symtab **symtabs;
810 /* These sections are what may appear in a (real or virtual) DWO file. */
814 struct dwarf2_section_info abbrev;
815 struct dwarf2_section_info line;
816 struct dwarf2_section_info loc;
817 struct dwarf2_section_info loclists;
818 struct dwarf2_section_info macinfo;
819 struct dwarf2_section_info macro;
820 struct dwarf2_section_info str;
821 struct dwarf2_section_info str_offsets;
822 /* In the case of a virtual DWO file, these two are unused. */
823 struct dwarf2_section_info info;
824 VEC (dwarf2_section_info_def) *types;
827 /* CUs/TUs in DWP/DWO files. */
831 /* Backlink to the containing struct dwo_file. */
832 struct dwo_file *dwo_file;
834 /* The "id" that distinguishes this CU/TU.
835 .debug_info calls this "dwo_id", .debug_types calls this "signature".
836 Since signatures came first, we stick with it for consistency. */
839 /* The section this CU/TU lives in, in the DWO file. */
840 struct dwarf2_section_info *section;
842 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
843 sect_offset sect_off;
846 /* For types, offset in the type's DIE of the type defined by this TU. */
847 cu_offset type_offset_in_tu;
850 /* include/dwarf2.h defines the DWP section codes.
851 It defines a max value but it doesn't define a min value, which we
852 use for error checking, so provide one. */
854 enum dwp_v2_section_ids
859 /* Data for one DWO file.
861 This includes virtual DWO files (a virtual DWO file is a DWO file as it
862 appears in a DWP file). DWP files don't really have DWO files per se -
863 comdat folding of types "loses" the DWO file they came from, and from
864 a high level view DWP files appear to contain a mass of random types.
865 However, to maintain consistency with the non-DWP case we pretend DWP
866 files contain virtual DWO files, and we assign each TU with one virtual
867 DWO file (generally based on the line and abbrev section offsets -
868 a heuristic that seems to work in practice). */
872 /* The DW_AT_GNU_dwo_name attribute.
873 For virtual DWO files the name is constructed from the section offsets
874 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
875 from related CU+TUs. */
876 const char *dwo_name;
878 /* The DW_AT_comp_dir attribute. */
879 const char *comp_dir;
881 /* The bfd, when the file is open. Otherwise this is NULL.
882 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
885 /* The sections that make up this DWO file.
886 Remember that for virtual DWO files in DWP V2, these are virtual
887 sections (for lack of a better name). */
888 struct dwo_sections sections;
890 /* The CUs in the file.
891 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
892 an extension to handle LLVM's Link Time Optimization output (where
893 multiple source files may be compiled into a single object/dwo pair). */
896 /* Table of TUs in the file.
897 Each element is a struct dwo_unit. */
901 /* These sections are what may appear in a DWP file. */
905 /* These are used by both DWP version 1 and 2. */
906 struct dwarf2_section_info str;
907 struct dwarf2_section_info cu_index;
908 struct dwarf2_section_info tu_index;
910 /* These are only used by DWP version 2 files.
911 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
912 sections are referenced by section number, and are not recorded here.
913 In DWP version 2 there is at most one copy of all these sections, each
914 section being (effectively) comprised of the concatenation of all of the
915 individual sections that exist in the version 1 format.
916 To keep the code simple we treat each of these concatenated pieces as a
917 section itself (a virtual section?). */
918 struct dwarf2_section_info abbrev;
919 struct dwarf2_section_info info;
920 struct dwarf2_section_info line;
921 struct dwarf2_section_info loc;
922 struct dwarf2_section_info macinfo;
923 struct dwarf2_section_info macro;
924 struct dwarf2_section_info str_offsets;
925 struct dwarf2_section_info types;
928 /* These sections are what may appear in a virtual DWO file in DWP version 1.
929 A virtual DWO file is a DWO file as it appears in a DWP file. */
931 struct virtual_v1_dwo_sections
933 struct dwarf2_section_info abbrev;
934 struct dwarf2_section_info line;
935 struct dwarf2_section_info loc;
936 struct dwarf2_section_info macinfo;
937 struct dwarf2_section_info macro;
938 struct dwarf2_section_info str_offsets;
939 /* Each DWP hash table entry records one CU or one TU.
940 That is recorded here, and copied to dwo_unit.section. */
941 struct dwarf2_section_info info_or_types;
944 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
945 In version 2, the sections of the DWO files are concatenated together
946 and stored in one section of that name. Thus each ELF section contains
947 several "virtual" sections. */
949 struct virtual_v2_dwo_sections
951 bfd_size_type abbrev_offset;
952 bfd_size_type abbrev_size;
954 bfd_size_type line_offset;
955 bfd_size_type line_size;
957 bfd_size_type loc_offset;
958 bfd_size_type loc_size;
960 bfd_size_type macinfo_offset;
961 bfd_size_type macinfo_size;
963 bfd_size_type macro_offset;
964 bfd_size_type macro_size;
966 bfd_size_type str_offsets_offset;
967 bfd_size_type str_offsets_size;
969 /* Each DWP hash table entry records one CU or one TU.
970 That is recorded here, and copied to dwo_unit.section. */
971 bfd_size_type info_or_types_offset;
972 bfd_size_type info_or_types_size;
975 /* Contents of DWP hash tables. */
977 struct dwp_hash_table
979 uint32_t version, nr_columns;
980 uint32_t nr_units, nr_slots;
981 const gdb_byte *hash_table, *unit_table;
986 const gdb_byte *indices;
990 /* This is indexed by column number and gives the id of the section
992 #define MAX_NR_V2_DWO_SECTIONS \
993 (1 /* .debug_info or .debug_types */ \
994 + 1 /* .debug_abbrev */ \
995 + 1 /* .debug_line */ \
996 + 1 /* .debug_loc */ \
997 + 1 /* .debug_str_offsets */ \
998 + 1 /* .debug_macro or .debug_macinfo */)
999 int section_ids[MAX_NR_V2_DWO_SECTIONS];
1000 const gdb_byte *offsets;
1001 const gdb_byte *sizes;
1006 /* Data for one DWP file. */
1010 /* Name of the file. */
1013 /* File format version. */
1019 /* Section info for this file. */
1020 struct dwp_sections sections;
1022 /* Table of CUs in the file. */
1023 const struct dwp_hash_table *cus;
1025 /* Table of TUs in the file. */
1026 const struct dwp_hash_table *tus;
1028 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
1032 /* Table to map ELF section numbers to their sections.
1033 This is only needed for the DWP V1 file format. */
1034 unsigned int num_sections;
1035 asection **elf_sections;
1038 /* This represents a '.dwz' file. */
1042 /* A dwz file can only contain a few sections. */
1043 struct dwarf2_section_info abbrev;
1044 struct dwarf2_section_info info;
1045 struct dwarf2_section_info str;
1046 struct dwarf2_section_info line;
1047 struct dwarf2_section_info macro;
1048 struct dwarf2_section_info gdb_index;
1050 /* The dwz's BFD. */
1054 /* Struct used to pass misc. parameters to read_die_and_children, et
1055 al. which are used for both .debug_info and .debug_types dies.
1056 All parameters here are unchanging for the life of the call. This
1057 struct exists to abstract away the constant parameters of die reading. */
1059 struct die_reader_specs
1061 /* The bfd of die_section. */
1064 /* The CU of the DIE we are parsing. */
1065 struct dwarf2_cu *cu;
1067 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
1068 struct dwo_file *dwo_file;
1070 /* The section the die comes from.
1071 This is either .debug_info or .debug_types, or the .dwo variants. */
1072 struct dwarf2_section_info *die_section;
1074 /* die_section->buffer. */
1075 const gdb_byte *buffer;
1077 /* The end of the buffer. */
1078 const gdb_byte *buffer_end;
1080 /* The value of the DW_AT_comp_dir attribute. */
1081 const char *comp_dir;
1084 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1085 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1086 const gdb_byte *info_ptr,
1087 struct die_info *comp_unit_die,
1091 /* A 1-based directory index. This is a strong typedef to prevent
1092 accidentally using a directory index as a 0-based index into an
1094 enum class dir_index : unsigned int {};
1096 /* Likewise, a 1-based file name index. */
1097 enum class file_name_index : unsigned int {};
1101 file_entry () = default;
1103 file_entry (const char *name_, dir_index d_index_,
1104 unsigned int mod_time_, unsigned int length_)
1107 mod_time (mod_time_),
1111 /* Return the include directory at D_INDEX stored in LH. Returns
1112 NULL if D_INDEX is out of bounds. */
1113 const char *include_dir (const line_header *lh) const;
1115 /* The file name. Note this is an observing pointer. The memory is
1116 owned by debug_line_buffer. */
1117 const char *name {};
1119 /* The directory index (1-based). */
1120 dir_index d_index {};
1122 unsigned int mod_time {};
1124 unsigned int length {};
1126 /* True if referenced by the Line Number Program. */
1129 /* The associated symbol table, if any. */
1130 struct symtab *symtab {};
1133 /* The line number information for a compilation unit (found in the
1134 .debug_line section) begins with a "statement program header",
1135 which contains the following information. */
1142 /* Add an entry to the include directory table. */
1143 void add_include_dir (const char *include_dir);
1145 /* Add an entry to the file name table. */
1146 void add_file_name (const char *name, dir_index d_index,
1147 unsigned int mod_time, unsigned int length);
1149 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
1150 is out of bounds. */
1151 const char *include_dir_at (dir_index index) const
1153 /* Convert directory index number (1-based) to vector index
1155 size_t vec_index = to_underlying (index) - 1;
1157 if (vec_index >= include_dirs.size ())
1159 return include_dirs[vec_index];
1162 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
1163 is out of bounds. */
1164 file_entry *file_name_at (file_name_index index)
1166 /* Convert file name index number (1-based) to vector index
1168 size_t vec_index = to_underlying (index) - 1;
1170 if (vec_index >= file_names.size ())
1172 return &file_names[vec_index];
1175 /* Const version of the above. */
1176 const file_entry *file_name_at (unsigned int index) const
1178 if (index >= file_names.size ())
1180 return &file_names[index];
1183 /* Offset of line number information in .debug_line section. */
1184 sect_offset sect_off {};
1186 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1187 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1189 unsigned int total_length {};
1190 unsigned short version {};
1191 unsigned int header_length {};
1192 unsigned char minimum_instruction_length {};
1193 unsigned char maximum_ops_per_instruction {};
1194 unsigned char default_is_stmt {};
1196 unsigned char line_range {};
1197 unsigned char opcode_base {};
1199 /* standard_opcode_lengths[i] is the number of operands for the
1200 standard opcode whose value is i. This means that
1201 standard_opcode_lengths[0] is unused, and the last meaningful
1202 element is standard_opcode_lengths[opcode_base - 1]. */
1203 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1205 /* The include_directories table. Note these are observing
1206 pointers. The memory is owned by debug_line_buffer. */
1207 std::vector<const char *> include_dirs;
1209 /* The file_names table. */
1210 std::vector<file_entry> file_names;
1212 /* The start and end of the statement program following this
1213 header. These point into dwarf2_per_objfile->line_buffer. */
1214 const gdb_byte *statement_program_start {}, *statement_program_end {};
1217 typedef std::unique_ptr<line_header> line_header_up;
1220 file_entry::include_dir (const line_header *lh) const
1222 return lh->include_dir_at (d_index);
1225 /* When we construct a partial symbol table entry we only
1226 need this much information. */
1227 struct partial_die_info
1229 /* Offset of this DIE. */
1230 sect_offset sect_off;
1232 /* DWARF-2 tag for this DIE. */
1233 ENUM_BITFIELD(dwarf_tag) tag : 16;
1235 /* Assorted flags describing the data found in this DIE. */
1236 unsigned int has_children : 1;
1237 unsigned int is_external : 1;
1238 unsigned int is_declaration : 1;
1239 unsigned int has_type : 1;
1240 unsigned int has_specification : 1;
1241 unsigned int has_pc_info : 1;
1242 unsigned int may_be_inlined : 1;
1244 /* This DIE has been marked DW_AT_main_subprogram. */
1245 unsigned int main_subprogram : 1;
1247 /* Flag set if the SCOPE field of this structure has been
1249 unsigned int scope_set : 1;
1251 /* Flag set if the DIE has a byte_size attribute. */
1252 unsigned int has_byte_size : 1;
1254 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1255 unsigned int has_const_value : 1;
1257 /* Flag set if any of the DIE's children are template arguments. */
1258 unsigned int has_template_arguments : 1;
1260 /* Flag set if fixup_partial_die has been called on this die. */
1261 unsigned int fixup_called : 1;
1263 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1264 unsigned int is_dwz : 1;
1266 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1267 unsigned int spec_is_dwz : 1;
1269 /* The name of this DIE. Normally the value of DW_AT_name, but
1270 sometimes a default name for unnamed DIEs. */
1273 /* The linkage name, if present. */
1274 const char *linkage_name;
1276 /* The scope to prepend to our children. This is generally
1277 allocated on the comp_unit_obstack, so will disappear
1278 when this compilation unit leaves the cache. */
1281 /* Some data associated with the partial DIE. The tag determines
1282 which field is live. */
1285 /* The location description associated with this DIE, if any. */
1286 struct dwarf_block *locdesc;
1287 /* The offset of an import, for DW_TAG_imported_unit. */
1288 sect_offset sect_off;
1291 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1295 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1296 DW_AT_sibling, if any. */
1297 /* NOTE: This member isn't strictly necessary, read_partial_die could
1298 return DW_AT_sibling values to its caller load_partial_dies. */
1299 const gdb_byte *sibling;
1301 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1302 DW_AT_specification (or DW_AT_abstract_origin or
1303 DW_AT_extension). */
1304 sect_offset spec_offset;
1306 /* Pointers to this DIE's parent, first child, and next sibling,
1308 struct partial_die_info *die_parent, *die_child, *die_sibling;
1311 /* This data structure holds the information of an abbrev. */
1314 unsigned int number; /* number identifying abbrev */
1315 enum dwarf_tag tag; /* dwarf tag */
1316 unsigned short has_children; /* boolean */
1317 unsigned short num_attrs; /* number of attributes */
1318 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1319 struct abbrev_info *next; /* next in chain */
1324 ENUM_BITFIELD(dwarf_attribute) name : 16;
1325 ENUM_BITFIELD(dwarf_form) form : 16;
1327 /* It is valid only if FORM is DW_FORM_implicit_const. */
1328 LONGEST implicit_const;
1331 /* Size of abbrev_table.abbrev_hash_table. */
1332 #define ABBREV_HASH_SIZE 121
1334 /* Top level data structure to contain an abbreviation table. */
1338 /* Where the abbrev table came from.
1339 This is used as a sanity check when the table is used. */
1340 sect_offset sect_off;
1342 /* Storage for the abbrev table. */
1343 struct obstack abbrev_obstack;
1345 /* Hash table of abbrevs.
1346 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1347 It could be statically allocated, but the previous code didn't so we
1349 struct abbrev_info **abbrevs;
1352 /* Attributes have a name and a value. */
1355 ENUM_BITFIELD(dwarf_attribute) name : 16;
1356 ENUM_BITFIELD(dwarf_form) form : 15;
1358 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1359 field should be in u.str (existing only for DW_STRING) but it is kept
1360 here for better struct attribute alignment. */
1361 unsigned int string_is_canonical : 1;
1366 struct dwarf_block *blk;
1375 /* This data structure holds a complete die structure. */
1378 /* DWARF-2 tag for this DIE. */
1379 ENUM_BITFIELD(dwarf_tag) tag : 16;
1381 /* Number of attributes */
1382 unsigned char num_attrs;
1384 /* True if we're presently building the full type name for the
1385 type derived from this DIE. */
1386 unsigned char building_fullname : 1;
1388 /* True if this die is in process. PR 16581. */
1389 unsigned char in_process : 1;
1392 unsigned int abbrev;
1394 /* Offset in .debug_info or .debug_types section. */
1395 sect_offset sect_off;
1397 /* The dies in a compilation unit form an n-ary tree. PARENT
1398 points to this die's parent; CHILD points to the first child of
1399 this node; and all the children of a given node are chained
1400 together via their SIBLING fields. */
1401 struct die_info *child; /* Its first child, if any. */
1402 struct die_info *sibling; /* Its next sibling, if any. */
1403 struct die_info *parent; /* Its parent, if any. */
1405 /* An array of attributes, with NUM_ATTRS elements. There may be
1406 zero, but it's not common and zero-sized arrays are not
1407 sufficiently portable C. */
1408 struct attribute attrs[1];
1411 /* Get at parts of an attribute structure. */
1413 #define DW_STRING(attr) ((attr)->u.str)
1414 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1415 #define DW_UNSND(attr) ((attr)->u.unsnd)
1416 #define DW_BLOCK(attr) ((attr)->u.blk)
1417 #define DW_SND(attr) ((attr)->u.snd)
1418 #define DW_ADDR(attr) ((attr)->u.addr)
1419 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1421 /* Blocks are a bunch of untyped bytes. */
1426 /* Valid only if SIZE is not zero. */
1427 const gdb_byte *data;
1430 #ifndef ATTR_ALLOC_CHUNK
1431 #define ATTR_ALLOC_CHUNK 4
1434 /* Allocate fields for structs, unions and enums in this size. */
1435 #ifndef DW_FIELD_ALLOC_CHUNK
1436 #define DW_FIELD_ALLOC_CHUNK 4
1439 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1440 but this would require a corresponding change in unpack_field_as_long
1442 static int bits_per_byte = 8;
1446 struct nextfield *next;
1454 struct nextfnfield *next;
1455 struct fn_field fnfield;
1462 struct nextfnfield *head;
1465 struct typedef_field_list
1467 struct typedef_field field;
1468 struct typedef_field_list *next;
1471 /* The routines that read and process dies for a C struct or C++ class
1472 pass lists of data member fields and lists of member function fields
1473 in an instance of a field_info structure, as defined below. */
1476 /* List of data member and baseclasses fields. */
1477 struct nextfield *fields, *baseclasses;
1479 /* Number of fields (including baseclasses). */
1482 /* Number of baseclasses. */
1485 /* Set if the accesibility of one of the fields is not public. */
1486 int non_public_fields;
1488 /* Member function fields array, entries are allocated in the order they
1489 are encountered in the object file. */
1490 struct nextfnfield *fnfields;
1492 /* Member function fieldlist array, contains name of possibly overloaded
1493 member function, number of overloaded member functions and a pointer
1494 to the head of the member function field chain. */
1495 struct fnfieldlist *fnfieldlists;
1497 /* Number of entries in the fnfieldlists array. */
1500 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1501 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1502 struct typedef_field_list *typedef_field_list;
1503 unsigned typedef_field_list_count;
1506 /* One item on the queue of compilation units to read in full symbols
1508 struct dwarf2_queue_item
1510 struct dwarf2_per_cu_data *per_cu;
1511 enum language pretend_language;
1512 struct dwarf2_queue_item *next;
1515 /* The current queue. */
1516 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1518 /* Loaded secondary compilation units are kept in memory until they
1519 have not been referenced for the processing of this many
1520 compilation units. Set this to zero to disable caching. Cache
1521 sizes of up to at least twenty will improve startup time for
1522 typical inter-CU-reference binaries, at an obvious memory cost. */
1523 static int dwarf_max_cache_age = 5;
1525 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1526 struct cmd_list_element *c, const char *value)
1528 fprintf_filtered (file, _("The upper bound on the age of cached "
1529 "DWARF compilation units is %s.\n"),
1533 /* local function prototypes */
1535 static const char *get_section_name (const struct dwarf2_section_info *);
1537 static const char *get_section_file_name (const struct dwarf2_section_info *);
1539 static void dwarf2_find_base_address (struct die_info *die,
1540 struct dwarf2_cu *cu);
1542 static struct partial_symtab *create_partial_symtab
1543 (struct dwarf2_per_cu_data *per_cu, const char *name);
1545 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1546 const gdb_byte *info_ptr,
1547 struct die_info *type_unit_die,
1548 int has_children, void *data);
1550 static void dwarf2_build_psymtabs_hard (struct objfile *);
1552 static void scan_partial_symbols (struct partial_die_info *,
1553 CORE_ADDR *, CORE_ADDR *,
1554 int, struct dwarf2_cu *);
1556 static void add_partial_symbol (struct partial_die_info *,
1557 struct dwarf2_cu *);
1559 static void add_partial_namespace (struct partial_die_info *pdi,
1560 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1561 int set_addrmap, struct dwarf2_cu *cu);
1563 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1564 CORE_ADDR *highpc, int set_addrmap,
1565 struct dwarf2_cu *cu);
1567 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1568 struct dwarf2_cu *cu);
1570 static void add_partial_subprogram (struct partial_die_info *pdi,
1571 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1572 int need_pc, struct dwarf2_cu *cu);
1574 static void dwarf2_read_symtab (struct partial_symtab *,
1577 static void psymtab_to_symtab_1 (struct partial_symtab *);
1579 static struct abbrev_info *abbrev_table_lookup_abbrev
1580 (const struct abbrev_table *, unsigned int);
1582 static struct abbrev_table *abbrev_table_read_table
1583 (struct dwarf2_section_info *, sect_offset);
1585 static void abbrev_table_free (struct abbrev_table *);
1587 static void abbrev_table_free_cleanup (void *);
1589 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1590 struct dwarf2_section_info *);
1592 static void dwarf2_free_abbrev_table (void *);
1594 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1596 static struct partial_die_info *load_partial_dies
1597 (const struct die_reader_specs *, const gdb_byte *, int);
1599 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1600 struct partial_die_info *,
1601 struct abbrev_info *,
1605 static struct partial_die_info *find_partial_die (sect_offset, int,
1606 struct dwarf2_cu *);
1608 static void fixup_partial_die (struct partial_die_info *,
1609 struct dwarf2_cu *);
1611 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1612 struct attribute *, struct attr_abbrev *,
1615 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1617 static int read_1_signed_byte (bfd *, const gdb_byte *);
1619 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1621 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1623 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1625 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1628 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1630 static LONGEST read_checked_initial_length_and_offset
1631 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1632 unsigned int *, unsigned int *);
1634 static LONGEST read_offset (bfd *, const gdb_byte *,
1635 const struct comp_unit_head *,
1638 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1640 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1643 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1645 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1647 static const char *read_indirect_string (bfd *, const gdb_byte *,
1648 const struct comp_unit_head *,
1651 static const char *read_indirect_line_string (bfd *, const gdb_byte *,
1652 const struct comp_unit_head *,
1655 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1657 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1659 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1663 static const char *read_str_index (const struct die_reader_specs *reader,
1664 ULONGEST str_index);
1666 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1668 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1669 struct dwarf2_cu *);
1671 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1674 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1675 struct dwarf2_cu *cu);
1677 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1678 struct dwarf2_cu *cu);
1680 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1682 static struct die_info *die_specification (struct die_info *die,
1683 struct dwarf2_cu **);
1685 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1686 struct dwarf2_cu *cu);
1688 static void dwarf_decode_lines (struct line_header *, const char *,
1689 struct dwarf2_cu *, struct partial_symtab *,
1690 CORE_ADDR, int decode_mapping);
1692 static void dwarf2_start_subfile (const char *, const char *);
1694 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1695 const char *, const char *,
1698 static struct symbol *new_symbol (struct die_info *, struct type *,
1699 struct dwarf2_cu *);
1701 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1702 struct dwarf2_cu *, struct symbol *);
1704 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1705 struct dwarf2_cu *);
1707 static void dwarf2_const_value_attr (const struct attribute *attr,
1710 struct obstack *obstack,
1711 struct dwarf2_cu *cu, LONGEST *value,
1712 const gdb_byte **bytes,
1713 struct dwarf2_locexpr_baton **baton);
1715 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1717 static int need_gnat_info (struct dwarf2_cu *);
1719 static struct type *die_descriptive_type (struct die_info *,
1720 struct dwarf2_cu *);
1722 static void set_descriptive_type (struct type *, struct die_info *,
1723 struct dwarf2_cu *);
1725 static struct type *die_containing_type (struct die_info *,
1726 struct dwarf2_cu *);
1728 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1729 struct dwarf2_cu *);
1731 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1733 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1735 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1737 static char *typename_concat (struct obstack *obs, const char *prefix,
1738 const char *suffix, int physname,
1739 struct dwarf2_cu *cu);
1741 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1743 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1745 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1747 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1749 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1751 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1752 struct dwarf2_cu *, struct partial_symtab *);
1754 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1755 values. Keep the items ordered with increasing constraints compliance. */
1758 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1759 PC_BOUNDS_NOT_PRESENT,
1761 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1762 were present but they do not form a valid range of PC addresses. */
1765 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1768 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1772 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1773 CORE_ADDR *, CORE_ADDR *,
1775 struct partial_symtab *);
1777 static void get_scope_pc_bounds (struct die_info *,
1778 CORE_ADDR *, CORE_ADDR *,
1779 struct dwarf2_cu *);
1781 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1782 CORE_ADDR, struct dwarf2_cu *);
1784 static void dwarf2_add_field (struct field_info *, struct die_info *,
1785 struct dwarf2_cu *);
1787 static void dwarf2_attach_fields_to_type (struct field_info *,
1788 struct type *, struct dwarf2_cu *);
1790 static void dwarf2_add_member_fn (struct field_info *,
1791 struct die_info *, struct type *,
1792 struct dwarf2_cu *);
1794 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1796 struct dwarf2_cu *);
1798 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1800 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1802 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1804 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1806 static struct using_direct **using_directives (enum language);
1808 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1810 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1812 static struct type *read_module_type (struct die_info *die,
1813 struct dwarf2_cu *cu);
1815 static const char *namespace_name (struct die_info *die,
1816 int *is_anonymous, struct dwarf2_cu *);
1818 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1820 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1822 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1823 struct dwarf2_cu *);
1825 static struct die_info *read_die_and_siblings_1
1826 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1829 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1830 const gdb_byte *info_ptr,
1831 const gdb_byte **new_info_ptr,
1832 struct die_info *parent);
1834 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1835 struct die_info **, const gdb_byte *,
1838 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1839 struct die_info **, const gdb_byte *,
1842 static void process_die (struct die_info *, struct dwarf2_cu *);
1844 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1847 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1849 static const char *dwarf2_full_name (const char *name,
1850 struct die_info *die,
1851 struct dwarf2_cu *cu);
1853 static const char *dwarf2_physname (const char *name, struct die_info *die,
1854 struct dwarf2_cu *cu);
1856 static struct die_info *dwarf2_extension (struct die_info *die,
1857 struct dwarf2_cu **);
1859 static const char *dwarf_tag_name (unsigned int);
1861 static const char *dwarf_attr_name (unsigned int);
1863 static const char *dwarf_form_name (unsigned int);
1865 static const char *dwarf_bool_name (unsigned int);
1867 static const char *dwarf_type_encoding_name (unsigned int);
1869 static struct die_info *sibling_die (struct die_info *);
1871 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1873 static void dump_die_for_error (struct die_info *);
1875 static void dump_die_1 (struct ui_file *, int level, int max_level,
1878 /*static*/ void dump_die (struct die_info *, int max_level);
1880 static void store_in_ref_table (struct die_info *,
1881 struct dwarf2_cu *);
1883 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1885 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1887 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1888 const struct attribute *,
1889 struct dwarf2_cu **);
1891 static struct die_info *follow_die_ref (struct die_info *,
1892 const struct attribute *,
1893 struct dwarf2_cu **);
1895 static struct die_info *follow_die_sig (struct die_info *,
1896 const struct attribute *,
1897 struct dwarf2_cu **);
1899 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1900 struct dwarf2_cu *);
1902 static struct type *get_DW_AT_signature_type (struct die_info *,
1903 const struct attribute *,
1904 struct dwarf2_cu *);
1906 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1908 static void read_signatured_type (struct signatured_type *);
1910 static int attr_to_dynamic_prop (const struct attribute *attr,
1911 struct die_info *die, struct dwarf2_cu *cu,
1912 struct dynamic_prop *prop);
1914 /* memory allocation interface */
1916 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1918 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1920 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1922 static int attr_form_is_block (const struct attribute *);
1924 static int attr_form_is_section_offset (const struct attribute *);
1926 static int attr_form_is_constant (const struct attribute *);
1928 static int attr_form_is_ref (const struct attribute *);
1930 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1931 struct dwarf2_loclist_baton *baton,
1932 const struct attribute *attr);
1934 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1936 struct dwarf2_cu *cu,
1939 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1940 const gdb_byte *info_ptr,
1941 struct abbrev_info *abbrev);
1943 static void free_stack_comp_unit (void *);
1945 static hashval_t partial_die_hash (const void *item);
1947 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1949 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1950 (sect_offset sect_off, unsigned int offset_in_dwz, struct objfile *objfile);
1952 static void init_one_comp_unit (struct dwarf2_cu *cu,
1953 struct dwarf2_per_cu_data *per_cu);
1955 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1956 struct die_info *comp_unit_die,
1957 enum language pretend_language);
1959 static void free_heap_comp_unit (void *);
1961 static void free_cached_comp_units (void *);
1963 static void age_cached_comp_units (void);
1965 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1967 static struct type *set_die_type (struct die_info *, struct type *,
1968 struct dwarf2_cu *);
1970 static void create_all_comp_units (struct objfile *);
1972 static int create_all_type_units (struct objfile *);
1974 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1977 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1980 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1983 static void dwarf2_add_dependence (struct dwarf2_cu *,
1984 struct dwarf2_per_cu_data *);
1986 static void dwarf2_mark (struct dwarf2_cu *);
1988 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1990 static struct type *get_die_type_at_offset (sect_offset,
1991 struct dwarf2_per_cu_data *);
1993 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1995 static void dwarf2_release_queue (void *dummy);
1997 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1998 enum language pretend_language);
2000 static void process_queue (void);
2002 /* The return type of find_file_and_directory. Note, the enclosed
2003 string pointers are only valid while this object is valid. */
2005 struct file_and_directory
2007 /* The filename. This is never NULL. */
2010 /* The compilation directory. NULL if not known. If we needed to
2011 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
2012 points directly to the DW_AT_comp_dir string attribute owned by
2013 the obstack that owns the DIE. */
2014 const char *comp_dir;
2016 /* If we needed to build a new string for comp_dir, this is what
2017 owns the storage. */
2018 std::string comp_dir_storage;
2021 static file_and_directory find_file_and_directory (struct die_info *die,
2022 struct dwarf2_cu *cu);
2024 static char *file_full_name (int file, struct line_header *lh,
2025 const char *comp_dir);
2027 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
2028 enum class rcuh_kind { COMPILE, TYPE };
2030 static const gdb_byte *read_and_check_comp_unit_head
2031 (struct comp_unit_head *header,
2032 struct dwarf2_section_info *section,
2033 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
2034 rcuh_kind section_kind);
2036 static void init_cutu_and_read_dies
2037 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
2038 int use_existing_cu, int keep,
2039 die_reader_func_ftype *die_reader_func, void *data);
2041 static void init_cutu_and_read_dies_simple
2042 (struct dwarf2_per_cu_data *this_cu,
2043 die_reader_func_ftype *die_reader_func, void *data);
2045 static htab_t allocate_signatured_type_table (struct objfile *objfile);
2047 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
2049 static struct dwo_unit *lookup_dwo_unit_in_dwp
2050 (struct dwp_file *dwp_file, const char *comp_dir,
2051 ULONGEST signature, int is_debug_types);
2053 static struct dwp_file *get_dwp_file (void);
2055 static struct dwo_unit *lookup_dwo_comp_unit
2056 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
2058 static struct dwo_unit *lookup_dwo_type_unit
2059 (struct signatured_type *, const char *, const char *);
2061 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
2063 static void free_dwo_file_cleanup (void *);
2065 static void process_cu_includes (void);
2067 static void check_producer (struct dwarf2_cu *cu);
2069 static void free_line_header_voidp (void *arg);
2071 /* Various complaints about symbol reading that don't abort the process. */
2074 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2076 complaint (&symfile_complaints,
2077 _("statement list doesn't fit in .debug_line section"));
2081 dwarf2_debug_line_missing_file_complaint (void)
2083 complaint (&symfile_complaints,
2084 _(".debug_line section has line data without a file"));
2088 dwarf2_debug_line_missing_end_sequence_complaint (void)
2090 complaint (&symfile_complaints,
2091 _(".debug_line section has line "
2092 "program sequence without an end"));
2096 dwarf2_complex_location_expr_complaint (void)
2098 complaint (&symfile_complaints, _("location expression too complex"));
2102 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2105 complaint (&symfile_complaints,
2106 _("const value length mismatch for '%s', got %d, expected %d"),
2111 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2113 complaint (&symfile_complaints,
2114 _("debug info runs off end of %s section"
2116 get_section_name (section),
2117 get_section_file_name (section));
2121 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2123 complaint (&symfile_complaints,
2124 _("macro debug info contains a "
2125 "malformed macro definition:\n`%s'"),
2130 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2132 complaint (&symfile_complaints,
2133 _("invalid attribute class or form for '%s' in '%s'"),
2137 /* Hash function for line_header_hash. */
2140 line_header_hash (const struct line_header *ofs)
2142 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2145 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2148 line_header_hash_voidp (const void *item)
2150 const struct line_header *ofs = (const struct line_header *) item;
2152 return line_header_hash (ofs);
2155 /* Equality function for line_header_hash. */
2158 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2160 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2161 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2163 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2164 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2170 /* Convert VALUE between big- and little-endian. */
2172 byte_swap (offset_type value)
2176 result = (value & 0xff) << 24;
2177 result |= (value & 0xff00) << 8;
2178 result |= (value & 0xff0000) >> 8;
2179 result |= (value & 0xff000000) >> 24;
2183 #define MAYBE_SWAP(V) byte_swap (V)
2186 #define MAYBE_SWAP(V) static_cast<offset_type> (V)
2187 #endif /* WORDS_BIGENDIAN */
2189 /* Read the given attribute value as an address, taking the attribute's
2190 form into account. */
2193 attr_value_as_address (struct attribute *attr)
2197 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2199 /* Aside from a few clearly defined exceptions, attributes that
2200 contain an address must always be in DW_FORM_addr form.
2201 Unfortunately, some compilers happen to be violating this
2202 requirement by encoding addresses using other forms, such
2203 as DW_FORM_data4 for example. For those broken compilers,
2204 we try to do our best, without any guarantee of success,
2205 to interpret the address correctly. It would also be nice
2206 to generate a complaint, but that would require us to maintain
2207 a list of legitimate cases where a non-address form is allowed,
2208 as well as update callers to pass in at least the CU's DWARF
2209 version. This is more overhead than what we're willing to
2210 expand for a pretty rare case. */
2211 addr = DW_UNSND (attr);
2214 addr = DW_ADDR (attr);
2219 /* The suffix for an index file. */
2220 #define INDEX_SUFFIX ".gdb-index"
2222 /* See declaration. */
2224 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2225 const dwarf2_debug_sections *names)
2226 : objfile (objfile_)
2229 names = &dwarf2_elf_names;
2231 bfd *obfd = objfile->obfd;
2233 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2234 locate_sections (obfd, sec, *names);
2237 dwarf2_per_objfile::~dwarf2_per_objfile ()
2239 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2240 free_cached_comp_units ();
2242 if (quick_file_names_table)
2243 htab_delete (quick_file_names_table);
2245 if (line_header_hash)
2246 htab_delete (line_header_hash);
2248 /* Everything else should be on the objfile obstack. */
2251 /* See declaration. */
2254 dwarf2_per_objfile::free_cached_comp_units ()
2256 dwarf2_per_cu_data *per_cu = read_in_chain;
2257 dwarf2_per_cu_data **last_chain = &read_in_chain;
2258 while (per_cu != NULL)
2260 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2262 free_heap_comp_unit (per_cu->cu);
2263 *last_chain = next_cu;
2268 /* Try to locate the sections we need for DWARF 2 debugging
2269 information and return true if we have enough to do something.
2270 NAMES points to the dwarf2 section names, or is NULL if the standard
2271 ELF names are used. */
2274 dwarf2_has_info (struct objfile *objfile,
2275 const struct dwarf2_debug_sections *names)
2277 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
2278 objfile_data (objfile, dwarf2_objfile_data_key));
2279 if (!dwarf2_per_objfile)
2281 /* Initialize per-objfile state. */
2282 struct dwarf2_per_objfile *data
2283 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_objfile);
2285 dwarf2_per_objfile = new (data) struct dwarf2_per_objfile (objfile, names);
2286 set_objfile_data (objfile, dwarf2_objfile_data_key, dwarf2_per_objfile);
2288 return (!dwarf2_per_objfile->info.is_virtual
2289 && dwarf2_per_objfile->info.s.section != NULL
2290 && !dwarf2_per_objfile->abbrev.is_virtual
2291 && dwarf2_per_objfile->abbrev.s.section != NULL);
2294 /* Return the containing section of virtual section SECTION. */
2296 static struct dwarf2_section_info *
2297 get_containing_section (const struct dwarf2_section_info *section)
2299 gdb_assert (section->is_virtual);
2300 return section->s.containing_section;
2303 /* Return the bfd owner of SECTION. */
2306 get_section_bfd_owner (const struct dwarf2_section_info *section)
2308 if (section->is_virtual)
2310 section = get_containing_section (section);
2311 gdb_assert (!section->is_virtual);
2313 return section->s.section->owner;
2316 /* Return the bfd section of SECTION.
2317 Returns NULL if the section is not present. */
2320 get_section_bfd_section (const struct dwarf2_section_info *section)
2322 if (section->is_virtual)
2324 section = get_containing_section (section);
2325 gdb_assert (!section->is_virtual);
2327 return section->s.section;
2330 /* Return the name of SECTION. */
2333 get_section_name (const struct dwarf2_section_info *section)
2335 asection *sectp = get_section_bfd_section (section);
2337 gdb_assert (sectp != NULL);
2338 return bfd_section_name (get_section_bfd_owner (section), sectp);
2341 /* Return the name of the file SECTION is in. */
2344 get_section_file_name (const struct dwarf2_section_info *section)
2346 bfd *abfd = get_section_bfd_owner (section);
2348 return bfd_get_filename (abfd);
2351 /* Return the id of SECTION.
2352 Returns 0 if SECTION doesn't exist. */
2355 get_section_id (const struct dwarf2_section_info *section)
2357 asection *sectp = get_section_bfd_section (section);
2364 /* Return the flags of SECTION.
2365 SECTION (or containing section if this is a virtual section) must exist. */
2368 get_section_flags (const struct dwarf2_section_info *section)
2370 asection *sectp = get_section_bfd_section (section);
2372 gdb_assert (sectp != NULL);
2373 return bfd_get_section_flags (sectp->owner, sectp);
2376 /* When loading sections, we look either for uncompressed section or for
2377 compressed section names. */
2380 section_is_p (const char *section_name,
2381 const struct dwarf2_section_names *names)
2383 if (names->normal != NULL
2384 && strcmp (section_name, names->normal) == 0)
2386 if (names->compressed != NULL
2387 && strcmp (section_name, names->compressed) == 0)
2392 /* See declaration. */
2395 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2396 const dwarf2_debug_sections &names)
2398 flagword aflag = bfd_get_section_flags (abfd, sectp);
2400 if ((aflag & SEC_HAS_CONTENTS) == 0)
2403 else if (section_is_p (sectp->name, &names.info))
2405 this->info.s.section = sectp;
2406 this->info.size = bfd_get_section_size (sectp);
2408 else if (section_is_p (sectp->name, &names.abbrev))
2410 this->abbrev.s.section = sectp;
2411 this->abbrev.size = bfd_get_section_size (sectp);
2413 else if (section_is_p (sectp->name, &names.line))
2415 this->line.s.section = sectp;
2416 this->line.size = bfd_get_section_size (sectp);
2418 else if (section_is_p (sectp->name, &names.loc))
2420 this->loc.s.section = sectp;
2421 this->loc.size = bfd_get_section_size (sectp);
2423 else if (section_is_p (sectp->name, &names.loclists))
2425 this->loclists.s.section = sectp;
2426 this->loclists.size = bfd_get_section_size (sectp);
2428 else if (section_is_p (sectp->name, &names.macinfo))
2430 this->macinfo.s.section = sectp;
2431 this->macinfo.size = bfd_get_section_size (sectp);
2433 else if (section_is_p (sectp->name, &names.macro))
2435 this->macro.s.section = sectp;
2436 this->macro.size = bfd_get_section_size (sectp);
2438 else if (section_is_p (sectp->name, &names.str))
2440 this->str.s.section = sectp;
2441 this->str.size = bfd_get_section_size (sectp);
2443 else if (section_is_p (sectp->name, &names.line_str))
2445 this->line_str.s.section = sectp;
2446 this->line_str.size = bfd_get_section_size (sectp);
2448 else if (section_is_p (sectp->name, &names.addr))
2450 this->addr.s.section = sectp;
2451 this->addr.size = bfd_get_section_size (sectp);
2453 else if (section_is_p (sectp->name, &names.frame))
2455 this->frame.s.section = sectp;
2456 this->frame.size = bfd_get_section_size (sectp);
2458 else if (section_is_p (sectp->name, &names.eh_frame))
2460 this->eh_frame.s.section = sectp;
2461 this->eh_frame.size = bfd_get_section_size (sectp);
2463 else if (section_is_p (sectp->name, &names.ranges))
2465 this->ranges.s.section = sectp;
2466 this->ranges.size = bfd_get_section_size (sectp);
2468 else if (section_is_p (sectp->name, &names.rnglists))
2470 this->rnglists.s.section = sectp;
2471 this->rnglists.size = bfd_get_section_size (sectp);
2473 else if (section_is_p (sectp->name, &names.types))
2475 struct dwarf2_section_info type_section;
2477 memset (&type_section, 0, sizeof (type_section));
2478 type_section.s.section = sectp;
2479 type_section.size = bfd_get_section_size (sectp);
2481 VEC_safe_push (dwarf2_section_info_def, this->types,
2484 else if (section_is_p (sectp->name, &names.gdb_index))
2486 this->gdb_index.s.section = sectp;
2487 this->gdb_index.size = bfd_get_section_size (sectp);
2490 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2491 && bfd_section_vma (abfd, sectp) == 0)
2492 this->has_section_at_zero = true;
2495 /* A helper function that decides whether a section is empty,
2499 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2501 if (section->is_virtual)
2502 return section->size == 0;
2503 return section->s.section == NULL || section->size == 0;
2506 /* Read the contents of the section INFO.
2507 OBJFILE is the main object file, but not necessarily the file where
2508 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2510 If the section is compressed, uncompress it before returning. */
2513 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2517 gdb_byte *buf, *retbuf;
2521 info->buffer = NULL;
2524 if (dwarf2_section_empty_p (info))
2527 sectp = get_section_bfd_section (info);
2529 /* If this is a virtual section we need to read in the real one first. */
2530 if (info->is_virtual)
2532 struct dwarf2_section_info *containing_section =
2533 get_containing_section (info);
2535 gdb_assert (sectp != NULL);
2536 if ((sectp->flags & SEC_RELOC) != 0)
2538 error (_("Dwarf Error: DWP format V2 with relocations is not"
2539 " supported in section %s [in module %s]"),
2540 get_section_name (info), get_section_file_name (info));
2542 dwarf2_read_section (objfile, containing_section);
2543 /* Other code should have already caught virtual sections that don't
2545 gdb_assert (info->virtual_offset + info->size
2546 <= containing_section->size);
2547 /* If the real section is empty or there was a problem reading the
2548 section we shouldn't get here. */
2549 gdb_assert (containing_section->buffer != NULL);
2550 info->buffer = containing_section->buffer + info->virtual_offset;
2554 /* If the section has relocations, we must read it ourselves.
2555 Otherwise we attach it to the BFD. */
2556 if ((sectp->flags & SEC_RELOC) == 0)
2558 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2562 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2565 /* When debugging .o files, we may need to apply relocations; see
2566 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2567 We never compress sections in .o files, so we only need to
2568 try this when the section is not compressed. */
2569 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2572 info->buffer = retbuf;
2576 abfd = get_section_bfd_owner (info);
2577 gdb_assert (abfd != NULL);
2579 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2580 || bfd_bread (buf, info->size, abfd) != info->size)
2582 error (_("Dwarf Error: Can't read DWARF data"
2583 " in section %s [in module %s]"),
2584 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2588 /* A helper function that returns the size of a section in a safe way.
2589 If you are positive that the section has been read before using the
2590 size, then it is safe to refer to the dwarf2_section_info object's
2591 "size" field directly. In other cases, you must call this
2592 function, because for compressed sections the size field is not set
2593 correctly until the section has been read. */
2595 static bfd_size_type
2596 dwarf2_section_size (struct objfile *objfile,
2597 struct dwarf2_section_info *info)
2600 dwarf2_read_section (objfile, info);
2604 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2608 dwarf2_get_section_info (struct objfile *objfile,
2609 enum dwarf2_section_enum sect,
2610 asection **sectp, const gdb_byte **bufp,
2611 bfd_size_type *sizep)
2613 struct dwarf2_per_objfile *data
2614 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2615 dwarf2_objfile_data_key);
2616 struct dwarf2_section_info *info;
2618 /* We may see an objfile without any DWARF, in which case we just
2629 case DWARF2_DEBUG_FRAME:
2630 info = &data->frame;
2632 case DWARF2_EH_FRAME:
2633 info = &data->eh_frame;
2636 gdb_assert_not_reached ("unexpected section");
2639 dwarf2_read_section (objfile, info);
2641 *sectp = get_section_bfd_section (info);
2642 *bufp = info->buffer;
2643 *sizep = info->size;
2646 /* A helper function to find the sections for a .dwz file. */
2649 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2651 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2653 /* Note that we only support the standard ELF names, because .dwz
2654 is ELF-only (at the time of writing). */
2655 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2657 dwz_file->abbrev.s.section = sectp;
2658 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2660 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2662 dwz_file->info.s.section = sectp;
2663 dwz_file->info.size = bfd_get_section_size (sectp);
2665 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2667 dwz_file->str.s.section = sectp;
2668 dwz_file->str.size = bfd_get_section_size (sectp);
2670 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2672 dwz_file->line.s.section = sectp;
2673 dwz_file->line.size = bfd_get_section_size (sectp);
2675 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2677 dwz_file->macro.s.section = sectp;
2678 dwz_file->macro.size = bfd_get_section_size (sectp);
2680 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2682 dwz_file->gdb_index.s.section = sectp;
2683 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2687 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2688 there is no .gnu_debugaltlink section in the file. Error if there
2689 is such a section but the file cannot be found. */
2691 static struct dwz_file *
2692 dwarf2_get_dwz_file (void)
2695 struct cleanup *cleanup;
2696 const char *filename;
2697 struct dwz_file *result;
2698 bfd_size_type buildid_len_arg;
2702 if (dwarf2_per_objfile->dwz_file != NULL)
2703 return dwarf2_per_objfile->dwz_file;
2705 bfd_set_error (bfd_error_no_error);
2706 data = bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2707 &buildid_len_arg, &buildid);
2710 if (bfd_get_error () == bfd_error_no_error)
2712 error (_("could not read '.gnu_debugaltlink' section: %s"),
2713 bfd_errmsg (bfd_get_error ()));
2715 cleanup = make_cleanup (xfree, data);
2716 make_cleanup (xfree, buildid);
2718 buildid_len = (size_t) buildid_len_arg;
2720 filename = (const char *) data;
2722 std::string abs_storage;
2723 if (!IS_ABSOLUTE_PATH (filename))
2725 gdb::unique_xmalloc_ptr<char> abs
2726 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2728 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2729 filename = abs_storage.c_str ();
2732 /* First try the file name given in the section. If that doesn't
2733 work, try to use the build-id instead. */
2734 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2735 if (dwz_bfd != NULL)
2737 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2741 if (dwz_bfd == NULL)
2742 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2744 if (dwz_bfd == NULL)
2745 error (_("could not find '.gnu_debugaltlink' file for %s"),
2746 objfile_name (dwarf2_per_objfile->objfile));
2748 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2750 result->dwz_bfd = dwz_bfd.release ();
2752 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
2754 do_cleanups (cleanup);
2756 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
2757 dwarf2_per_objfile->dwz_file = result;
2761 /* DWARF quick_symbols_functions support. */
2763 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2764 unique line tables, so we maintain a separate table of all .debug_line
2765 derived entries to support the sharing.
2766 All the quick functions need is the list of file names. We discard the
2767 line_header when we're done and don't need to record it here. */
2768 struct quick_file_names
2770 /* The data used to construct the hash key. */
2771 struct stmt_list_hash hash;
2773 /* The number of entries in file_names, real_names. */
2774 unsigned int num_file_names;
2776 /* The file names from the line table, after being run through
2778 const char **file_names;
2780 /* The file names from the line table after being run through
2781 gdb_realpath. These are computed lazily. */
2782 const char **real_names;
2785 /* When using the index (and thus not using psymtabs), each CU has an
2786 object of this type. This is used to hold information needed by
2787 the various "quick" methods. */
2788 struct dwarf2_per_cu_quick_data
2790 /* The file table. This can be NULL if there was no file table
2791 or it's currently not read in.
2792 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2793 struct quick_file_names *file_names;
2795 /* The corresponding symbol table. This is NULL if symbols for this
2796 CU have not yet been read. */
2797 struct compunit_symtab *compunit_symtab;
2799 /* A temporary mark bit used when iterating over all CUs in
2800 expand_symtabs_matching. */
2801 unsigned int mark : 1;
2803 /* True if we've tried to read the file table and found there isn't one.
2804 There will be no point in trying to read it again next time. */
2805 unsigned int no_file_data : 1;
2808 /* Utility hash function for a stmt_list_hash. */
2811 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2815 if (stmt_list_hash->dwo_unit != NULL)
2816 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2817 v += to_underlying (stmt_list_hash->line_sect_off);
2821 /* Utility equality function for a stmt_list_hash. */
2824 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2825 const struct stmt_list_hash *rhs)
2827 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2829 if (lhs->dwo_unit != NULL
2830 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2833 return lhs->line_sect_off == rhs->line_sect_off;
2836 /* Hash function for a quick_file_names. */
2839 hash_file_name_entry (const void *e)
2841 const struct quick_file_names *file_data
2842 = (const struct quick_file_names *) e;
2844 return hash_stmt_list_entry (&file_data->hash);
2847 /* Equality function for a quick_file_names. */
2850 eq_file_name_entry (const void *a, const void *b)
2852 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2853 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2855 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2858 /* Delete function for a quick_file_names. */
2861 delete_file_name_entry (void *e)
2863 struct quick_file_names *file_data = (struct quick_file_names *) e;
2866 for (i = 0; i < file_data->num_file_names; ++i)
2868 xfree ((void*) file_data->file_names[i]);
2869 if (file_data->real_names)
2870 xfree ((void*) file_data->real_names[i]);
2873 /* The space for the struct itself lives on objfile_obstack,
2874 so we don't free it here. */
2877 /* Create a quick_file_names hash table. */
2880 create_quick_file_names_table (unsigned int nr_initial_entries)
2882 return htab_create_alloc (nr_initial_entries,
2883 hash_file_name_entry, eq_file_name_entry,
2884 delete_file_name_entry, xcalloc, xfree);
2887 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2888 have to be created afterwards. You should call age_cached_comp_units after
2889 processing PER_CU->CU. dw2_setup must have been already called. */
2892 load_cu (struct dwarf2_per_cu_data *per_cu)
2894 if (per_cu->is_debug_types)
2895 load_full_type_unit (per_cu);
2897 load_full_comp_unit (per_cu, language_minimal);
2899 if (per_cu->cu == NULL)
2900 return; /* Dummy CU. */
2902 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2905 /* Read in the symbols for PER_CU. */
2908 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2910 struct cleanup *back_to;
2912 /* Skip type_unit_groups, reading the type units they contain
2913 is handled elsewhere. */
2914 if (IS_TYPE_UNIT_GROUP (per_cu))
2917 back_to = make_cleanup (dwarf2_release_queue, NULL);
2919 if (dwarf2_per_objfile->using_index
2920 ? per_cu->v.quick->compunit_symtab == NULL
2921 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2923 queue_comp_unit (per_cu, language_minimal);
2926 /* If we just loaded a CU from a DWO, and we're working with an index
2927 that may badly handle TUs, load all the TUs in that DWO as well.
2928 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2929 if (!per_cu->is_debug_types
2930 && per_cu->cu != NULL
2931 && per_cu->cu->dwo_unit != NULL
2932 && dwarf2_per_objfile->index_table != NULL
2933 && dwarf2_per_objfile->index_table->version <= 7
2934 /* DWP files aren't supported yet. */
2935 && get_dwp_file () == NULL)
2936 queue_and_load_all_dwo_tus (per_cu);
2941 /* Age the cache, releasing compilation units that have not
2942 been used recently. */
2943 age_cached_comp_units ();
2945 do_cleanups (back_to);
2948 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2949 the objfile from which this CU came. Returns the resulting symbol
2952 static struct compunit_symtab *
2953 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2955 gdb_assert (dwarf2_per_objfile->using_index);
2956 if (!per_cu->v.quick->compunit_symtab)
2958 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2959 scoped_restore decrementer = increment_reading_symtab ();
2960 dw2_do_instantiate_symtab (per_cu);
2961 process_cu_includes ();
2962 do_cleanups (back_to);
2965 return per_cu->v.quick->compunit_symtab;
2968 /* Return the CU/TU given its index.
2970 This is intended for loops like:
2972 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2973 + dwarf2_per_objfile->n_type_units); ++i)
2975 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
2981 static struct dwarf2_per_cu_data *
2982 dw2_get_cutu (int index)
2984 if (index >= dwarf2_per_objfile->n_comp_units)
2986 index -= dwarf2_per_objfile->n_comp_units;
2987 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2988 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2991 return dwarf2_per_objfile->all_comp_units[index];
2994 /* Return the CU given its index.
2995 This differs from dw2_get_cutu in that it's for when you know INDEX
2998 static struct dwarf2_per_cu_data *
2999 dw2_get_cu (int index)
3001 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
3003 return dwarf2_per_objfile->all_comp_units[index];
3006 /* A helper for create_cus_from_index that handles a given list of
3010 create_cus_from_index_list (struct objfile *objfile,
3011 const gdb_byte *cu_list, offset_type n_elements,
3012 struct dwarf2_section_info *section,
3018 for (i = 0; i < n_elements; i += 2)
3020 gdb_static_assert (sizeof (ULONGEST) >= 8);
3022 sect_offset sect_off
3023 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
3024 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3027 dwarf2_per_cu_data *the_cu
3028 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3029 struct dwarf2_per_cu_data);
3030 the_cu->sect_off = sect_off;
3031 the_cu->length = length;
3032 the_cu->objfile = objfile;
3033 the_cu->section = section;
3034 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3035 struct dwarf2_per_cu_quick_data);
3036 the_cu->is_dwz = is_dwz;
3037 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
3041 /* Read the CU list from the mapped index, and use it to create all
3042 the CU objects for this objfile. */
3045 create_cus_from_index (struct objfile *objfile,
3046 const gdb_byte *cu_list, offset_type cu_list_elements,
3047 const gdb_byte *dwz_list, offset_type dwz_elements)
3049 struct dwz_file *dwz;
3051 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
3052 dwarf2_per_objfile->all_comp_units =
3053 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
3054 dwarf2_per_objfile->n_comp_units);
3056 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
3057 &dwarf2_per_objfile->info, 0, 0);
3059 if (dwz_elements == 0)
3062 dwz = dwarf2_get_dwz_file ();
3063 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
3064 cu_list_elements / 2);
3067 /* Create the signatured type hash table from the index. */
3070 create_signatured_type_table_from_index (struct objfile *objfile,
3071 struct dwarf2_section_info *section,
3072 const gdb_byte *bytes,
3073 offset_type elements)
3076 htab_t sig_types_hash;
3078 dwarf2_per_objfile->n_type_units
3079 = dwarf2_per_objfile->n_allocated_type_units
3081 dwarf2_per_objfile->all_type_units =
3082 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3084 sig_types_hash = allocate_signatured_type_table (objfile);
3086 for (i = 0; i < elements; i += 3)
3088 struct signatured_type *sig_type;
3091 cu_offset type_offset_in_tu;
3093 gdb_static_assert (sizeof (ULONGEST) >= 8);
3094 sect_offset sect_off
3095 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3097 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3099 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3102 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3103 struct signatured_type);
3104 sig_type->signature = signature;
3105 sig_type->type_offset_in_tu = type_offset_in_tu;
3106 sig_type->per_cu.is_debug_types = 1;
3107 sig_type->per_cu.section = section;
3108 sig_type->per_cu.sect_off = sect_off;
3109 sig_type->per_cu.objfile = objfile;
3110 sig_type->per_cu.v.quick
3111 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3112 struct dwarf2_per_cu_quick_data);
3114 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3117 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
3120 dwarf2_per_objfile->signatured_types = sig_types_hash;
3123 /* Read the address map data from the mapped index, and use it to
3124 populate the objfile's psymtabs_addrmap. */
3127 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
3129 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3130 const gdb_byte *iter, *end;
3131 struct addrmap *mutable_map;
3134 auto_obstack temp_obstack;
3136 mutable_map = addrmap_create_mutable (&temp_obstack);
3138 iter = index->address_table;
3139 end = iter + index->address_table_size;
3141 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3145 ULONGEST hi, lo, cu_index;
3146 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3148 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3150 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3155 complaint (&symfile_complaints,
3156 _(".gdb_index address table has invalid range (%s - %s)"),
3157 hex_string (lo), hex_string (hi));
3161 if (cu_index >= dwarf2_per_objfile->n_comp_units)
3163 complaint (&symfile_complaints,
3164 _(".gdb_index address table has invalid CU number %u"),
3165 (unsigned) cu_index);
3169 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3170 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3171 addrmap_set_empty (mutable_map, lo, hi - 1, dw2_get_cutu (cu_index));
3174 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3175 &objfile->objfile_obstack);
3178 /* The hash function for strings in the mapped index. This is the same as
3179 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
3180 implementation. This is necessary because the hash function is tied to the
3181 format of the mapped index file. The hash values do not have to match with
3184 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
3187 mapped_index_string_hash (int index_version, const void *p)
3189 const unsigned char *str = (const unsigned char *) p;
3193 while ((c = *str++) != 0)
3195 if (index_version >= 5)
3197 r = r * 67 + c - 113;
3203 /* Find a slot in the mapped index INDEX for the object named NAME.
3204 If NAME is found, set *VEC_OUT to point to the CU vector in the
3205 constant pool and return 1. If NAME cannot be found, return 0. */
3208 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3209 offset_type **vec_out)
3211 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
3213 offset_type slot, step;
3214 int (*cmp) (const char *, const char *);
3216 if (current_language->la_language == language_cplus
3217 || current_language->la_language == language_fortran
3218 || current_language->la_language == language_d)
3220 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3223 if (strchr (name, '(') != NULL)
3225 char *without_params = cp_remove_params (name);
3227 if (without_params != NULL)
3229 make_cleanup (xfree, without_params);
3230 name = without_params;
3235 /* Index version 4 did not support case insensitive searches. But the
3236 indices for case insensitive languages are built in lowercase, therefore
3237 simulate our NAME being searched is also lowercased. */
3238 hash = mapped_index_string_hash ((index->version == 4
3239 && case_sensitivity == case_sensitive_off
3240 ? 5 : index->version),
3243 slot = hash & (index->symbol_table_slots - 1);
3244 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
3245 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3249 /* Convert a slot number to an offset into the table. */
3250 offset_type i = 2 * slot;
3252 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
3254 do_cleanups (back_to);
3258 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
3259 if (!cmp (name, str))
3261 *vec_out = (offset_type *) (index->constant_pool
3262 + MAYBE_SWAP (index->symbol_table[i + 1]));
3263 do_cleanups (back_to);
3267 slot = (slot + step) & (index->symbol_table_slots - 1);
3271 /* A helper function that reads the .gdb_index from SECTION and fills
3272 in MAP. FILENAME is the name of the file containing the section;
3273 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3274 ok to use deprecated sections.
3276 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3277 out parameters that are filled in with information about the CU and
3278 TU lists in the section.
3280 Returns 1 if all went well, 0 otherwise. */
3283 read_index_from_section (struct objfile *objfile,
3284 const char *filename,
3286 struct dwarf2_section_info *section,
3287 struct mapped_index *map,
3288 const gdb_byte **cu_list,
3289 offset_type *cu_list_elements,
3290 const gdb_byte **types_list,
3291 offset_type *types_list_elements)
3293 const gdb_byte *addr;
3294 offset_type version;
3295 offset_type *metadata;
3298 if (dwarf2_section_empty_p (section))
3301 /* Older elfutils strip versions could keep the section in the main
3302 executable while splitting it for the separate debug info file. */
3303 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3306 dwarf2_read_section (objfile, section);
3308 addr = section->buffer;
3309 /* Version check. */
3310 version = MAYBE_SWAP (*(offset_type *) addr);
3311 /* Versions earlier than 3 emitted every copy of a psymbol. This
3312 causes the index to behave very poorly for certain requests. Version 3
3313 contained incomplete addrmap. So, it seems better to just ignore such
3317 static int warning_printed = 0;
3318 if (!warning_printed)
3320 warning (_("Skipping obsolete .gdb_index section in %s."),
3322 warning_printed = 1;
3326 /* Index version 4 uses a different hash function than index version
3329 Versions earlier than 6 did not emit psymbols for inlined
3330 functions. Using these files will cause GDB not to be able to
3331 set breakpoints on inlined functions by name, so we ignore these
3332 indices unless the user has done
3333 "set use-deprecated-index-sections on". */
3334 if (version < 6 && !deprecated_ok)
3336 static int warning_printed = 0;
3337 if (!warning_printed)
3340 Skipping deprecated .gdb_index section in %s.\n\
3341 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3342 to use the section anyway."),
3344 warning_printed = 1;
3348 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3349 of the TU (for symbols coming from TUs),
3350 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3351 Plus gold-generated indices can have duplicate entries for global symbols,
3352 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3353 These are just performance bugs, and we can't distinguish gdb-generated
3354 indices from gold-generated ones, so issue no warning here. */
3356 /* Indexes with higher version than the one supported by GDB may be no
3357 longer backward compatible. */
3361 map->version = version;
3362 map->total_size = section->size;
3364 metadata = (offset_type *) (addr + sizeof (offset_type));
3367 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3368 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3372 *types_list = addr + MAYBE_SWAP (metadata[i]);
3373 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3374 - MAYBE_SWAP (metadata[i]))
3378 map->address_table = addr + MAYBE_SWAP (metadata[i]);
3379 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
3380 - MAYBE_SWAP (metadata[i]));
3383 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
3384 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
3385 - MAYBE_SWAP (metadata[i]))
3386 / (2 * sizeof (offset_type)));
3389 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3395 /* Read the index file. If everything went ok, initialize the "quick"
3396 elements of all the CUs and return 1. Otherwise, return 0. */
3399 dwarf2_read_index (struct objfile *objfile)
3401 struct mapped_index local_map, *map;
3402 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3403 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3404 struct dwz_file *dwz;
3406 if (!read_index_from_section (objfile, objfile_name (objfile),
3407 use_deprecated_index_sections,
3408 &dwarf2_per_objfile->gdb_index, &local_map,
3409 &cu_list, &cu_list_elements,
3410 &types_list, &types_list_elements))
3413 /* Don't use the index if it's empty. */
3414 if (local_map.symbol_table_slots == 0)
3417 /* If there is a .dwz file, read it so we can get its CU list as
3419 dwz = dwarf2_get_dwz_file ();
3422 struct mapped_index dwz_map;
3423 const gdb_byte *dwz_types_ignore;
3424 offset_type dwz_types_elements_ignore;
3426 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3428 &dwz->gdb_index, &dwz_map,
3429 &dwz_list, &dwz_list_elements,
3431 &dwz_types_elements_ignore))
3433 warning (_("could not read '.gdb_index' section from %s; skipping"),
3434 bfd_get_filename (dwz->dwz_bfd));
3439 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3442 if (types_list_elements)
3444 struct dwarf2_section_info *section;
3446 /* We can only handle a single .debug_types when we have an
3448 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3451 section = VEC_index (dwarf2_section_info_def,
3452 dwarf2_per_objfile->types, 0);
3454 create_signatured_type_table_from_index (objfile, section, types_list,
3455 types_list_elements);
3458 create_addrmap_from_index (objfile, &local_map);
3460 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
3463 dwarf2_per_objfile->index_table = map;
3464 dwarf2_per_objfile->using_index = 1;
3465 dwarf2_per_objfile->quick_file_names_table =
3466 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3471 /* A helper for the "quick" functions which sets the global
3472 dwarf2_per_objfile according to OBJFILE. */
3475 dw2_setup (struct objfile *objfile)
3477 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
3478 objfile_data (objfile, dwarf2_objfile_data_key));
3479 gdb_assert (dwarf2_per_objfile);
3482 /* die_reader_func for dw2_get_file_names. */
3485 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3486 const gdb_byte *info_ptr,
3487 struct die_info *comp_unit_die,
3491 struct dwarf2_cu *cu = reader->cu;
3492 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3493 struct objfile *objfile = dwarf2_per_objfile->objfile;
3494 struct dwarf2_per_cu_data *lh_cu;
3495 struct attribute *attr;
3498 struct quick_file_names *qfn;
3500 gdb_assert (! this_cu->is_debug_types);
3502 /* Our callers never want to match partial units -- instead they
3503 will match the enclosing full CU. */
3504 if (comp_unit_die->tag == DW_TAG_partial_unit)
3506 this_cu->v.quick->no_file_data = 1;
3514 sect_offset line_offset {};
3516 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3519 struct quick_file_names find_entry;
3521 line_offset = (sect_offset) DW_UNSND (attr);
3523 /* We may have already read in this line header (TU line header sharing).
3524 If we have we're done. */
3525 find_entry.hash.dwo_unit = cu->dwo_unit;
3526 find_entry.hash.line_sect_off = line_offset;
3527 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3528 &find_entry, INSERT);
3531 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3535 lh = dwarf_decode_line_header (line_offset, cu);
3539 lh_cu->v.quick->no_file_data = 1;
3543 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3544 qfn->hash.dwo_unit = cu->dwo_unit;
3545 qfn->hash.line_sect_off = line_offset;
3546 gdb_assert (slot != NULL);
3549 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3551 qfn->num_file_names = lh->file_names.size ();
3553 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3554 for (i = 0; i < lh->file_names.size (); ++i)
3555 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3556 qfn->real_names = NULL;
3558 lh_cu->v.quick->file_names = qfn;
3561 /* A helper for the "quick" functions which attempts to read the line
3562 table for THIS_CU. */
3564 static struct quick_file_names *
3565 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3567 /* This should never be called for TUs. */
3568 gdb_assert (! this_cu->is_debug_types);
3569 /* Nor type unit groups. */
3570 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3572 if (this_cu->v.quick->file_names != NULL)
3573 return this_cu->v.quick->file_names;
3574 /* If we know there is no line data, no point in looking again. */
3575 if (this_cu->v.quick->no_file_data)
3578 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3580 if (this_cu->v.quick->no_file_data)
3582 return this_cu->v.quick->file_names;
3585 /* A helper for the "quick" functions which computes and caches the
3586 real path for a given file name from the line table. */
3589 dw2_get_real_path (struct objfile *objfile,
3590 struct quick_file_names *qfn, int index)
3592 if (qfn->real_names == NULL)
3593 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3594 qfn->num_file_names, const char *);
3596 if (qfn->real_names[index] == NULL)
3597 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
3599 return qfn->real_names[index];
3602 static struct symtab *
3603 dw2_find_last_source_symtab (struct objfile *objfile)
3605 struct compunit_symtab *cust;
3608 dw2_setup (objfile);
3609 index = dwarf2_per_objfile->n_comp_units - 1;
3610 cust = dw2_instantiate_symtab (dw2_get_cutu (index));
3613 return compunit_primary_filetab (cust);
3616 /* Traversal function for dw2_forget_cached_source_info. */
3619 dw2_free_cached_file_names (void **slot, void *info)
3621 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3623 if (file_data->real_names)
3627 for (i = 0; i < file_data->num_file_names; ++i)
3629 xfree ((void*) file_data->real_names[i]);
3630 file_data->real_names[i] = NULL;
3638 dw2_forget_cached_source_info (struct objfile *objfile)
3640 dw2_setup (objfile);
3642 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3643 dw2_free_cached_file_names, NULL);
3646 /* Helper function for dw2_map_symtabs_matching_filename that expands
3647 the symtabs and calls the iterator. */
3650 dw2_map_expand_apply (struct objfile *objfile,
3651 struct dwarf2_per_cu_data *per_cu,
3652 const char *name, const char *real_path,
3653 gdb::function_view<bool (symtab *)> callback)
3655 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3657 /* Don't visit already-expanded CUs. */
3658 if (per_cu->v.quick->compunit_symtab)
3661 /* This may expand more than one symtab, and we want to iterate over
3663 dw2_instantiate_symtab (per_cu);
3665 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3666 last_made, callback);
3669 /* Implementation of the map_symtabs_matching_filename method. */
3672 dw2_map_symtabs_matching_filename
3673 (struct objfile *objfile, const char *name, const char *real_path,
3674 gdb::function_view<bool (symtab *)> callback)
3677 const char *name_basename = lbasename (name);
3679 dw2_setup (objfile);
3681 /* The rule is CUs specify all the files, including those used by
3682 any TU, so there's no need to scan TUs here. */
3684 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3687 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3688 struct quick_file_names *file_data;
3690 /* We only need to look at symtabs not already expanded. */
3691 if (per_cu->v.quick->compunit_symtab)
3694 file_data = dw2_get_file_names (per_cu);
3695 if (file_data == NULL)
3698 for (j = 0; j < file_data->num_file_names; ++j)
3700 const char *this_name = file_data->file_names[j];
3701 const char *this_real_name;
3703 if (compare_filenames_for_search (this_name, name))
3705 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3711 /* Before we invoke realpath, which can get expensive when many
3712 files are involved, do a quick comparison of the basenames. */
3713 if (! basenames_may_differ
3714 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3717 this_real_name = dw2_get_real_path (objfile, file_data, j);
3718 if (compare_filenames_for_search (this_real_name, name))
3720 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3726 if (real_path != NULL)
3728 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3729 gdb_assert (IS_ABSOLUTE_PATH (name));
3730 if (this_real_name != NULL
3731 && FILENAME_CMP (real_path, this_real_name) == 0)
3733 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3745 /* Struct used to manage iterating over all CUs looking for a symbol. */
3747 struct dw2_symtab_iterator
3749 /* The internalized form of .gdb_index. */
3750 struct mapped_index *index;
3751 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3752 int want_specific_block;
3753 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3754 Unused if !WANT_SPECIFIC_BLOCK. */
3756 /* The kind of symbol we're looking for. */
3758 /* The list of CUs from the index entry of the symbol,
3759 or NULL if not found. */
3761 /* The next element in VEC to look at. */
3763 /* The number of elements in VEC, or zero if there is no match. */
3765 /* Have we seen a global version of the symbol?
3766 If so we can ignore all further global instances.
3767 This is to work around gold/15646, inefficient gold-generated
3772 /* Initialize the index symtab iterator ITER.
3773 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3774 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3777 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3778 struct mapped_index *index,
3779 int want_specific_block,
3784 iter->index = index;
3785 iter->want_specific_block = want_specific_block;
3786 iter->block_index = block_index;
3787 iter->domain = domain;
3789 iter->global_seen = 0;
3791 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3792 iter->length = MAYBE_SWAP (*iter->vec);
3800 /* Return the next matching CU or NULL if there are no more. */
3802 static struct dwarf2_per_cu_data *
3803 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3805 for ( ; iter->next < iter->length; ++iter->next)
3807 offset_type cu_index_and_attrs =
3808 MAYBE_SWAP (iter->vec[iter->next + 1]);
3809 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3810 struct dwarf2_per_cu_data *per_cu;
3811 int want_static = iter->block_index != GLOBAL_BLOCK;
3812 /* This value is only valid for index versions >= 7. */
3813 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3814 gdb_index_symbol_kind symbol_kind =
3815 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3816 /* Only check the symbol attributes if they're present.
3817 Indices prior to version 7 don't record them,
3818 and indices >= 7 may elide them for certain symbols
3819 (gold does this). */
3821 (iter->index->version >= 7
3822 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3824 /* Don't crash on bad data. */
3825 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3826 + dwarf2_per_objfile->n_type_units))
3828 complaint (&symfile_complaints,
3829 _(".gdb_index entry has bad CU index"
3831 objfile_name (dwarf2_per_objfile->objfile));
3835 per_cu = dw2_get_cutu (cu_index);
3837 /* Skip if already read in. */
3838 if (per_cu->v.quick->compunit_symtab)
3841 /* Check static vs global. */
3844 if (iter->want_specific_block
3845 && want_static != is_static)
3847 /* Work around gold/15646. */
3848 if (!is_static && iter->global_seen)
3851 iter->global_seen = 1;
3854 /* Only check the symbol's kind if it has one. */
3857 switch (iter->domain)
3860 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3861 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3862 /* Some types are also in VAR_DOMAIN. */
3863 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3867 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3871 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3886 static struct compunit_symtab *
3887 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3888 const char *name, domain_enum domain)
3890 struct compunit_symtab *stab_best = NULL;
3891 struct mapped_index *index;
3893 dw2_setup (objfile);
3895 index = dwarf2_per_objfile->index_table;
3897 /* index is NULL if OBJF_READNOW. */
3900 struct dw2_symtab_iterator iter;
3901 struct dwarf2_per_cu_data *per_cu;
3903 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3905 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3907 struct symbol *sym, *with_opaque = NULL;
3908 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
3909 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
3910 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3912 sym = block_find_symbol (block, name, domain,
3913 block_find_non_opaque_type_preferred,
3916 /* Some caution must be observed with overloaded functions
3917 and methods, since the index will not contain any overload
3918 information (but NAME might contain it). */
3921 && SYMBOL_MATCHES_SEARCH_NAME (sym, name))
3923 if (with_opaque != NULL
3924 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, name))
3927 /* Keep looking through other CUs. */
3935 dw2_print_stats (struct objfile *objfile)
3937 int i, total, count;
3939 dw2_setup (objfile);
3940 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3942 for (i = 0; i < total; ++i)
3944 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3946 if (!per_cu->v.quick->compunit_symtab)
3949 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3950 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3953 /* This dumps minimal information about the index.
3954 It is called via "mt print objfiles".
3955 One use is to verify .gdb_index has been loaded by the
3956 gdb.dwarf2/gdb-index.exp testcase. */
3959 dw2_dump (struct objfile *objfile)
3961 dw2_setup (objfile);
3962 gdb_assert (dwarf2_per_objfile->using_index);
3963 printf_filtered (".gdb_index:");
3964 if (dwarf2_per_objfile->index_table != NULL)
3966 printf_filtered (" version %d\n",
3967 dwarf2_per_objfile->index_table->version);
3970 printf_filtered (" faked for \"readnow\"\n");
3971 printf_filtered ("\n");
3975 dw2_relocate (struct objfile *objfile,
3976 const struct section_offsets *new_offsets,
3977 const struct section_offsets *delta)
3979 /* There's nothing to relocate here. */
3983 dw2_expand_symtabs_for_function (struct objfile *objfile,
3984 const char *func_name)
3986 struct mapped_index *index;
3988 dw2_setup (objfile);
3990 index = dwarf2_per_objfile->index_table;
3992 /* index is NULL if OBJF_READNOW. */
3995 struct dw2_symtab_iterator iter;
3996 struct dwarf2_per_cu_data *per_cu;
3998 /* Note: It doesn't matter what we pass for block_index here. */
3999 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4002 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4003 dw2_instantiate_symtab (per_cu);
4008 dw2_expand_all_symtabs (struct objfile *objfile)
4012 dw2_setup (objfile);
4014 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4015 + dwarf2_per_objfile->n_type_units); ++i)
4017 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4019 dw2_instantiate_symtab (per_cu);
4024 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4025 const char *fullname)
4029 dw2_setup (objfile);
4031 /* We don't need to consider type units here.
4032 This is only called for examining code, e.g. expand_line_sal.
4033 There can be an order of magnitude (or more) more type units
4034 than comp units, and we avoid them if we can. */
4036 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4039 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4040 struct quick_file_names *file_data;
4042 /* We only need to look at symtabs not already expanded. */
4043 if (per_cu->v.quick->compunit_symtab)
4046 file_data = dw2_get_file_names (per_cu);
4047 if (file_data == NULL)
4050 for (j = 0; j < file_data->num_file_names; ++j)
4052 const char *this_fullname = file_data->file_names[j];
4054 if (filename_cmp (this_fullname, fullname) == 0)
4056 dw2_instantiate_symtab (per_cu);
4064 dw2_map_matching_symbols (struct objfile *objfile,
4065 const char * name, domain_enum domain,
4067 int (*callback) (struct block *,
4068 struct symbol *, void *),
4069 void *data, symbol_compare_ftype *match,
4070 symbol_compare_ftype *ordered_compare)
4072 /* Currently unimplemented; used for Ada. The function can be called if the
4073 current language is Ada for a non-Ada objfile using GNU index. As Ada
4074 does not look for non-Ada symbols this function should just return. */
4078 dw2_expand_symtabs_matching
4079 (struct objfile *objfile,
4080 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
4081 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4082 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
4083 enum search_domain kind)
4087 struct mapped_index *index;
4089 dw2_setup (objfile);
4091 /* index_table is NULL if OBJF_READNOW. */
4092 if (!dwarf2_per_objfile->index_table)
4094 index = dwarf2_per_objfile->index_table;
4096 if (file_matcher != NULL)
4098 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
4100 NULL, xcalloc, xfree));
4101 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
4103 NULL, xcalloc, xfree));
4105 /* The rule is CUs specify all the files, including those used by
4106 any TU, so there's no need to scan TUs here. */
4108 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4111 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4112 struct quick_file_names *file_data;
4117 per_cu->v.quick->mark = 0;
4119 /* We only need to look at symtabs not already expanded. */
4120 if (per_cu->v.quick->compunit_symtab)
4123 file_data = dw2_get_file_names (per_cu);
4124 if (file_data == NULL)
4127 if (htab_find (visited_not_found.get (), file_data) != NULL)
4129 else if (htab_find (visited_found.get (), file_data) != NULL)
4131 per_cu->v.quick->mark = 1;
4135 for (j = 0; j < file_data->num_file_names; ++j)
4137 const char *this_real_name;
4139 if (file_matcher (file_data->file_names[j], false))
4141 per_cu->v.quick->mark = 1;
4145 /* Before we invoke realpath, which can get expensive when many
4146 files are involved, do a quick comparison of the basenames. */
4147 if (!basenames_may_differ
4148 && !file_matcher (lbasename (file_data->file_names[j]),
4152 this_real_name = dw2_get_real_path (objfile, file_data, j);
4153 if (file_matcher (this_real_name, false))
4155 per_cu->v.quick->mark = 1;
4160 slot = htab_find_slot (per_cu->v.quick->mark
4161 ? visited_found.get ()
4162 : visited_not_found.get (),
4168 for (iter = 0; iter < index->symbol_table_slots; ++iter)
4170 offset_type idx = 2 * iter;
4172 offset_type *vec, vec_len, vec_idx;
4173 int global_seen = 0;
4177 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
4180 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
4182 if (!symbol_matcher (name))
4185 /* The name was matched, now expand corresponding CUs that were
4187 vec = (offset_type *) (index->constant_pool
4188 + MAYBE_SWAP (index->symbol_table[idx + 1]));
4189 vec_len = MAYBE_SWAP (vec[0]);
4190 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
4192 struct dwarf2_per_cu_data *per_cu;
4193 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
4194 /* This value is only valid for index versions >= 7. */
4195 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
4196 gdb_index_symbol_kind symbol_kind =
4197 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
4198 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
4199 /* Only check the symbol attributes if they're present.
4200 Indices prior to version 7 don't record them,
4201 and indices >= 7 may elide them for certain symbols
4202 (gold does this). */
4204 (index->version >= 7
4205 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4207 /* Work around gold/15646. */
4210 if (!is_static && global_seen)
4216 /* Only check the symbol's kind if it has one. */
4221 case VARIABLES_DOMAIN:
4222 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
4225 case FUNCTIONS_DOMAIN:
4226 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
4230 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4238 /* Don't crash on bad data. */
4239 if (cu_index >= (dwarf2_per_objfile->n_comp_units
4240 + dwarf2_per_objfile->n_type_units))
4242 complaint (&symfile_complaints,
4243 _(".gdb_index entry has bad CU index"
4244 " [in module %s]"), objfile_name (objfile));
4248 per_cu = dw2_get_cutu (cu_index);
4249 if (file_matcher == NULL || per_cu->v.quick->mark)
4251 int symtab_was_null =
4252 (per_cu->v.quick->compunit_symtab == NULL);
4254 dw2_instantiate_symtab (per_cu);
4256 if (expansion_notify != NULL
4258 && per_cu->v.quick->compunit_symtab != NULL)
4260 expansion_notify (per_cu->v.quick->compunit_symtab);
4267 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
4270 static struct compunit_symtab *
4271 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
4276 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
4277 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
4280 if (cust->includes == NULL)
4283 for (i = 0; cust->includes[i]; ++i)
4285 struct compunit_symtab *s = cust->includes[i];
4287 s = recursively_find_pc_sect_compunit_symtab (s, pc);
4295 static struct compunit_symtab *
4296 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
4297 struct bound_minimal_symbol msymbol,
4299 struct obj_section *section,
4302 struct dwarf2_per_cu_data *data;
4303 struct compunit_symtab *result;
4305 dw2_setup (objfile);
4307 if (!objfile->psymtabs_addrmap)
4310 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
4315 if (warn_if_readin && data->v.quick->compunit_symtab)
4316 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
4317 paddress (get_objfile_arch (objfile), pc));
4320 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
4322 gdb_assert (result != NULL);
4327 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
4328 void *data, int need_fullname)
4330 dw2_setup (objfile);
4332 if (!dwarf2_per_objfile->filenames_cache)
4334 dwarf2_per_objfile->filenames_cache.emplace ();
4336 htab_up visited (htab_create_alloc (10,
4337 htab_hash_pointer, htab_eq_pointer,
4338 NULL, xcalloc, xfree));
4340 /* The rule is CUs specify all the files, including those used
4341 by any TU, so there's no need to scan TUs here. We can
4342 ignore file names coming from already-expanded CUs. */
4344 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4346 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4348 if (per_cu->v.quick->compunit_symtab)
4350 void **slot = htab_find_slot (visited.get (),
4351 per_cu->v.quick->file_names,
4354 *slot = per_cu->v.quick->file_names;
4358 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4361 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4362 struct quick_file_names *file_data;
4365 /* We only need to look at symtabs not already expanded. */
4366 if (per_cu->v.quick->compunit_symtab)
4369 file_data = dw2_get_file_names (per_cu);
4370 if (file_data == NULL)
4373 slot = htab_find_slot (visited.get (), file_data, INSERT);
4376 /* Already visited. */
4381 for (int j = 0; j < file_data->num_file_names; ++j)
4383 const char *filename = file_data->file_names[j];
4384 dwarf2_per_objfile->filenames_cache->seen (filename);
4389 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
4391 gdb::unique_xmalloc_ptr<char> this_real_name;
4394 this_real_name = gdb_realpath (filename);
4395 (*fun) (filename, this_real_name.get (), data);
4400 dw2_has_symbols (struct objfile *objfile)
4405 const struct quick_symbol_functions dwarf2_gdb_index_functions =
4408 dw2_find_last_source_symtab,
4409 dw2_forget_cached_source_info,
4410 dw2_map_symtabs_matching_filename,
4415 dw2_expand_symtabs_for_function,
4416 dw2_expand_all_symtabs,
4417 dw2_expand_symtabs_with_fullname,
4418 dw2_map_matching_symbols,
4419 dw2_expand_symtabs_matching,
4420 dw2_find_pc_sect_compunit_symtab,
4421 dw2_map_symbol_filenames
4424 /* Initialize for reading DWARF for this objfile. Return 0 if this
4425 file will use psymtabs, or 1 if using the GNU index. */
4428 dwarf2_initialize_objfile (struct objfile *objfile)
4430 /* If we're about to read full symbols, don't bother with the
4431 indices. In this case we also don't care if some other debug
4432 format is making psymtabs, because they are all about to be
4434 if ((objfile->flags & OBJF_READNOW))
4438 dwarf2_per_objfile->using_index = 1;
4439 create_all_comp_units (objfile);
4440 create_all_type_units (objfile);
4441 dwarf2_per_objfile->quick_file_names_table =
4442 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
4444 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4445 + dwarf2_per_objfile->n_type_units); ++i)
4447 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4449 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4450 struct dwarf2_per_cu_quick_data);
4453 /* Return 1 so that gdb sees the "quick" functions. However,
4454 these functions will be no-ops because we will have expanded
4459 if (dwarf2_read_index (objfile))
4467 /* Build a partial symbol table. */
4470 dwarf2_build_psymtabs (struct objfile *objfile)
4473 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
4475 init_psymbol_list (objfile, 1024);
4480 /* This isn't really ideal: all the data we allocate on the
4481 objfile's obstack is still uselessly kept around. However,
4482 freeing it seems unsafe. */
4483 psymtab_discarder psymtabs (objfile);
4484 dwarf2_build_psymtabs_hard (objfile);
4487 CATCH (except, RETURN_MASK_ERROR)
4489 exception_print (gdb_stderr, except);
4494 /* Return the total length of the CU described by HEADER. */
4497 get_cu_length (const struct comp_unit_head *header)
4499 return header->initial_length_size + header->length;
4502 /* Return TRUE if SECT_OFF is within CU_HEADER. */
4505 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
4507 sect_offset bottom = cu_header->sect_off;
4508 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
4510 return sect_off >= bottom && sect_off < top;
4513 /* Find the base address of the compilation unit for range lists and
4514 location lists. It will normally be specified by DW_AT_low_pc.
4515 In DWARF-3 draft 4, the base address could be overridden by
4516 DW_AT_entry_pc. It's been removed, but GCC still uses this for
4517 compilation units with discontinuous ranges. */
4520 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
4522 struct attribute *attr;
4525 cu->base_address = 0;
4527 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
4530 cu->base_address = attr_value_as_address (attr);
4535 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
4538 cu->base_address = attr_value_as_address (attr);
4544 /* Read in the comp unit header information from the debug_info at info_ptr.
4545 Use rcuh_kind::COMPILE as the default type if not known by the caller.
4546 NOTE: This leaves members offset, first_die_offset to be filled in
4549 static const gdb_byte *
4550 read_comp_unit_head (struct comp_unit_head *cu_header,
4551 const gdb_byte *info_ptr,
4552 struct dwarf2_section_info *section,
4553 rcuh_kind section_kind)
4556 unsigned int bytes_read;
4557 const char *filename = get_section_file_name (section);
4558 bfd *abfd = get_section_bfd_owner (section);
4560 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
4561 cu_header->initial_length_size = bytes_read;
4562 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
4563 info_ptr += bytes_read;
4564 cu_header->version = read_2_bytes (abfd, info_ptr);
4566 if (cu_header->version < 5)
4567 switch (section_kind)
4569 case rcuh_kind::COMPILE:
4570 cu_header->unit_type = DW_UT_compile;
4572 case rcuh_kind::TYPE:
4573 cu_header->unit_type = DW_UT_type;
4576 internal_error (__FILE__, __LINE__,
4577 _("read_comp_unit_head: invalid section_kind"));
4581 cu_header->unit_type = static_cast<enum dwarf_unit_type>
4582 (read_1_byte (abfd, info_ptr));
4584 switch (cu_header->unit_type)
4587 if (section_kind != rcuh_kind::COMPILE)
4588 error (_("Dwarf Error: wrong unit_type in compilation unit header "
4589 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
4593 section_kind = rcuh_kind::TYPE;
4596 error (_("Dwarf Error: wrong unit_type in compilation unit header "
4597 "(is %d, should be %d or %d) [in module %s]"),
4598 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
4601 cu_header->addr_size = read_1_byte (abfd, info_ptr);
4604 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
4607 info_ptr += bytes_read;
4608 if (cu_header->version < 5)
4610 cu_header->addr_size = read_1_byte (abfd, info_ptr);
4613 signed_addr = bfd_get_sign_extend_vma (abfd);
4614 if (signed_addr < 0)
4615 internal_error (__FILE__, __LINE__,
4616 _("read_comp_unit_head: dwarf from non elf file"));
4617 cu_header->signed_addr_p = signed_addr;
4619 if (section_kind == rcuh_kind::TYPE)
4621 LONGEST type_offset;
4623 cu_header->signature = read_8_bytes (abfd, info_ptr);
4626 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
4627 info_ptr += bytes_read;
4628 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
4629 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
4630 error (_("Dwarf Error: Too big type_offset in compilation unit "
4631 "header (is %s) [in module %s]"), plongest (type_offset),
4638 /* Helper function that returns the proper abbrev section for
4641 static struct dwarf2_section_info *
4642 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
4644 struct dwarf2_section_info *abbrev;
4646 if (this_cu->is_dwz)
4647 abbrev = &dwarf2_get_dwz_file ()->abbrev;
4649 abbrev = &dwarf2_per_objfile->abbrev;
4654 /* Subroutine of read_and_check_comp_unit_head and
4655 read_and_check_type_unit_head to simplify them.
4656 Perform various error checking on the header. */
4659 error_check_comp_unit_head (struct comp_unit_head *header,
4660 struct dwarf2_section_info *section,
4661 struct dwarf2_section_info *abbrev_section)
4663 const char *filename = get_section_file_name (section);
4665 if (header->version < 2 || header->version > 5)
4666 error (_("Dwarf Error: wrong version in compilation unit header "
4667 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
4670 if (to_underlying (header->abbrev_sect_off)
4671 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
4672 error (_("Dwarf Error: bad offset (0x%x) in compilation unit header "
4673 "(offset 0x%x + 6) [in module %s]"),
4674 to_underlying (header->abbrev_sect_off),
4675 to_underlying (header->sect_off),
4678 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
4679 avoid potential 32-bit overflow. */
4680 if (((ULONGEST) header->sect_off + get_cu_length (header))
4682 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
4683 "(offset 0x%x + 0) [in module %s]"),
4684 header->length, to_underlying (header->sect_off),
4688 /* Read in a CU/TU header and perform some basic error checking.
4689 The contents of the header are stored in HEADER.
4690 The result is a pointer to the start of the first DIE. */
4692 static const gdb_byte *
4693 read_and_check_comp_unit_head (struct comp_unit_head *header,
4694 struct dwarf2_section_info *section,
4695 struct dwarf2_section_info *abbrev_section,
4696 const gdb_byte *info_ptr,
4697 rcuh_kind section_kind)
4699 const gdb_byte *beg_of_comp_unit = info_ptr;
4700 bfd *abfd = get_section_bfd_owner (section);
4702 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
4704 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
4706 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
4708 error_check_comp_unit_head (header, section, abbrev_section);
4713 /* Fetch the abbreviation table offset from a comp or type unit header. */
4716 read_abbrev_offset (struct dwarf2_section_info *section,
4717 sect_offset sect_off)
4719 bfd *abfd = get_section_bfd_owner (section);
4720 const gdb_byte *info_ptr;
4721 unsigned int initial_length_size, offset_size;
4724 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4725 info_ptr = section->buffer + to_underlying (sect_off);
4726 read_initial_length (abfd, info_ptr, &initial_length_size);
4727 offset_size = initial_length_size == 4 ? 4 : 8;
4728 info_ptr += initial_length_size;
4730 version = read_2_bytes (abfd, info_ptr);
4734 /* Skip unit type and address size. */
4738 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
4741 /* Allocate a new partial symtab for file named NAME and mark this new
4742 partial symtab as being an include of PST. */
4745 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4746 struct objfile *objfile)
4748 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4750 if (!IS_ABSOLUTE_PATH (subpst->filename))
4752 /* It shares objfile->objfile_obstack. */
4753 subpst->dirname = pst->dirname;
4756 subpst->textlow = 0;
4757 subpst->texthigh = 0;
4759 subpst->dependencies
4760 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
4761 subpst->dependencies[0] = pst;
4762 subpst->number_of_dependencies = 1;
4764 subpst->globals_offset = 0;
4765 subpst->n_global_syms = 0;
4766 subpst->statics_offset = 0;
4767 subpst->n_static_syms = 0;
4768 subpst->compunit_symtab = NULL;
4769 subpst->read_symtab = pst->read_symtab;
4772 /* No private part is necessary for include psymtabs. This property
4773 can be used to differentiate between such include psymtabs and
4774 the regular ones. */
4775 subpst->read_symtab_private = NULL;
4778 /* Read the Line Number Program data and extract the list of files
4779 included by the source file represented by PST. Build an include
4780 partial symtab for each of these included files. */
4783 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4784 struct die_info *die,
4785 struct partial_symtab *pst)
4788 struct attribute *attr;
4790 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4792 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
4794 return; /* No linetable, so no includes. */
4796 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4797 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
4801 hash_signatured_type (const void *item)
4803 const struct signatured_type *sig_type
4804 = (const struct signatured_type *) item;
4806 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4807 return sig_type->signature;
4811 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4813 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
4814 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
4816 return lhs->signature == rhs->signature;
4819 /* Allocate a hash table for signatured types. */
4822 allocate_signatured_type_table (struct objfile *objfile)
4824 return htab_create_alloc_ex (41,
4825 hash_signatured_type,
4828 &objfile->objfile_obstack,
4829 hashtab_obstack_allocate,
4830 dummy_obstack_deallocate);
4833 /* A helper function to add a signatured type CU to a table. */
4836 add_signatured_type_cu_to_table (void **slot, void *datum)
4838 struct signatured_type *sigt = (struct signatured_type *) *slot;
4839 struct signatured_type ***datap = (struct signatured_type ***) datum;
4847 /* A helper for create_debug_types_hash_table. Read types from SECTION
4848 and fill them into TYPES_HTAB. It will process only type units,
4849 therefore DW_UT_type. */
4852 create_debug_type_hash_table (struct dwo_file *dwo_file,
4853 dwarf2_section_info *section, htab_t &types_htab,
4854 rcuh_kind section_kind)
4856 struct objfile *objfile = dwarf2_per_objfile->objfile;
4857 struct dwarf2_section_info *abbrev_section;
4859 const gdb_byte *info_ptr, *end_ptr;
4861 abbrev_section = (dwo_file != NULL
4862 ? &dwo_file->sections.abbrev
4863 : &dwarf2_per_objfile->abbrev);
4865 if (dwarf_read_debug)
4866 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
4867 get_section_name (section),
4868 get_section_file_name (abbrev_section));
4870 dwarf2_read_section (objfile, section);
4871 info_ptr = section->buffer;
4873 if (info_ptr == NULL)
4876 /* We can't set abfd until now because the section may be empty or
4877 not present, in which case the bfd is unknown. */
4878 abfd = get_section_bfd_owner (section);
4880 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4881 because we don't need to read any dies: the signature is in the
4884 end_ptr = info_ptr + section->size;
4885 while (info_ptr < end_ptr)
4887 struct signatured_type *sig_type;
4888 struct dwo_unit *dwo_tu;
4890 const gdb_byte *ptr = info_ptr;
4891 struct comp_unit_head header;
4892 unsigned int length;
4894 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
4896 /* Initialize it due to a false compiler warning. */
4897 header.signature = -1;
4898 header.type_cu_offset_in_tu = (cu_offset) -1;
4900 /* We need to read the type's signature in order to build the hash
4901 table, but we don't need anything else just yet. */
4903 ptr = read_and_check_comp_unit_head (&header, section,
4904 abbrev_section, ptr, section_kind);
4906 length = get_cu_length (&header);
4908 /* Skip dummy type units. */
4909 if (ptr >= info_ptr + length
4910 || peek_abbrev_code (abfd, ptr) == 0
4911 || header.unit_type != DW_UT_type)
4917 if (types_htab == NULL)
4920 types_htab = allocate_dwo_unit_table (objfile);
4922 types_htab = allocate_signatured_type_table (objfile);
4928 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4930 dwo_tu->dwo_file = dwo_file;
4931 dwo_tu->signature = header.signature;
4932 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
4933 dwo_tu->section = section;
4934 dwo_tu->sect_off = sect_off;
4935 dwo_tu->length = length;
4939 /* N.B.: type_offset is not usable if this type uses a DWO file.
4940 The real type_offset is in the DWO file. */
4942 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4943 struct signatured_type);
4944 sig_type->signature = header.signature;
4945 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
4946 sig_type->per_cu.objfile = objfile;
4947 sig_type->per_cu.is_debug_types = 1;
4948 sig_type->per_cu.section = section;
4949 sig_type->per_cu.sect_off = sect_off;
4950 sig_type->per_cu.length = length;
4953 slot = htab_find_slot (types_htab,
4954 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4956 gdb_assert (slot != NULL);
4959 sect_offset dup_sect_off;
4963 const struct dwo_unit *dup_tu
4964 = (const struct dwo_unit *) *slot;
4966 dup_sect_off = dup_tu->sect_off;
4970 const struct signatured_type *dup_tu
4971 = (const struct signatured_type *) *slot;
4973 dup_sect_off = dup_tu->per_cu.sect_off;
4976 complaint (&symfile_complaints,
4977 _("debug type entry at offset 0x%x is duplicate to"
4978 " the entry at offset 0x%x, signature %s"),
4979 to_underlying (sect_off), to_underlying (dup_sect_off),
4980 hex_string (header.signature));
4982 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4984 if (dwarf_read_debug > 1)
4985 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
4986 to_underlying (sect_off),
4987 hex_string (header.signature));
4993 /* Create the hash table of all entries in the .debug_types
4994 (or .debug_types.dwo) section(s).
4995 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4996 otherwise it is NULL.
4998 The result is a pointer to the hash table or NULL if there are no types.
5000 Note: This function processes DWO files only, not DWP files. */
5003 create_debug_types_hash_table (struct dwo_file *dwo_file,
5004 VEC (dwarf2_section_info_def) *types,
5008 struct dwarf2_section_info *section;
5010 if (VEC_empty (dwarf2_section_info_def, types))
5014 VEC_iterate (dwarf2_section_info_def, types, ix, section);
5016 create_debug_type_hash_table (dwo_file, section, types_htab,
5020 /* Create the hash table of all entries in the .debug_types section,
5021 and initialize all_type_units.
5022 The result is zero if there is an error (e.g. missing .debug_types section),
5023 otherwise non-zero. */
5026 create_all_type_units (struct objfile *objfile)
5028 htab_t types_htab = NULL;
5029 struct signatured_type **iter;
5031 create_debug_type_hash_table (NULL, &dwarf2_per_objfile->info, types_htab,
5032 rcuh_kind::COMPILE);
5033 create_debug_types_hash_table (NULL, dwarf2_per_objfile->types, types_htab);
5034 if (types_htab == NULL)
5036 dwarf2_per_objfile->signatured_types = NULL;
5040 dwarf2_per_objfile->signatured_types = types_htab;
5042 dwarf2_per_objfile->n_type_units
5043 = dwarf2_per_objfile->n_allocated_type_units
5044 = htab_elements (types_htab);
5045 dwarf2_per_objfile->all_type_units =
5046 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
5047 iter = &dwarf2_per_objfile->all_type_units[0];
5048 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
5049 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
5050 == dwarf2_per_objfile->n_type_units);
5055 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
5056 If SLOT is non-NULL, it is the entry to use in the hash table.
5057 Otherwise we find one. */
5059 static struct signatured_type *
5060 add_type_unit (ULONGEST sig, void **slot)
5062 struct objfile *objfile = dwarf2_per_objfile->objfile;
5063 int n_type_units = dwarf2_per_objfile->n_type_units;
5064 struct signatured_type *sig_type;
5066 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
5068 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
5070 if (dwarf2_per_objfile->n_allocated_type_units == 0)
5071 dwarf2_per_objfile->n_allocated_type_units = 1;
5072 dwarf2_per_objfile->n_allocated_type_units *= 2;
5073 dwarf2_per_objfile->all_type_units
5074 = XRESIZEVEC (struct signatured_type *,
5075 dwarf2_per_objfile->all_type_units,
5076 dwarf2_per_objfile->n_allocated_type_units);
5077 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
5079 dwarf2_per_objfile->n_type_units = n_type_units;
5081 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5082 struct signatured_type);
5083 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
5084 sig_type->signature = sig;
5085 sig_type->per_cu.is_debug_types = 1;
5086 if (dwarf2_per_objfile->using_index)
5088 sig_type->per_cu.v.quick =
5089 OBSTACK_ZALLOC (&objfile->objfile_obstack,
5090 struct dwarf2_per_cu_quick_data);
5095 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5098 gdb_assert (*slot == NULL);
5100 /* The rest of sig_type must be filled in by the caller. */
5104 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
5105 Fill in SIG_ENTRY with DWO_ENTRY. */
5108 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
5109 struct signatured_type *sig_entry,
5110 struct dwo_unit *dwo_entry)
5112 /* Make sure we're not clobbering something we don't expect to. */
5113 gdb_assert (! sig_entry->per_cu.queued);
5114 gdb_assert (sig_entry->per_cu.cu == NULL);
5115 if (dwarf2_per_objfile->using_index)
5117 gdb_assert (sig_entry->per_cu.v.quick != NULL);
5118 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
5121 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
5122 gdb_assert (sig_entry->signature == dwo_entry->signature);
5123 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
5124 gdb_assert (sig_entry->type_unit_group == NULL);
5125 gdb_assert (sig_entry->dwo_unit == NULL);
5127 sig_entry->per_cu.section = dwo_entry->section;
5128 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
5129 sig_entry->per_cu.length = dwo_entry->length;
5130 sig_entry->per_cu.reading_dwo_directly = 1;
5131 sig_entry->per_cu.objfile = objfile;
5132 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
5133 sig_entry->dwo_unit = dwo_entry;
5136 /* Subroutine of lookup_signatured_type.
5137 If we haven't read the TU yet, create the signatured_type data structure
5138 for a TU to be read in directly from a DWO file, bypassing the stub.
5139 This is the "Stay in DWO Optimization": When there is no DWP file and we're
5140 using .gdb_index, then when reading a CU we want to stay in the DWO file
5141 containing that CU. Otherwise we could end up reading several other DWO
5142 files (due to comdat folding) to process the transitive closure of all the
5143 mentioned TUs, and that can be slow. The current DWO file will have every
5144 type signature that it needs.
5145 We only do this for .gdb_index because in the psymtab case we already have
5146 to read all the DWOs to build the type unit groups. */
5148 static struct signatured_type *
5149 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5151 struct objfile *objfile = dwarf2_per_objfile->objfile;
5152 struct dwo_file *dwo_file;
5153 struct dwo_unit find_dwo_entry, *dwo_entry;
5154 struct signatured_type find_sig_entry, *sig_entry;
5157 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
5159 /* If TU skeletons have been removed then we may not have read in any
5161 if (dwarf2_per_objfile->signatured_types == NULL)
5163 dwarf2_per_objfile->signatured_types
5164 = allocate_signatured_type_table (objfile);
5167 /* We only ever need to read in one copy of a signatured type.
5168 Use the global signatured_types array to do our own comdat-folding
5169 of types. If this is the first time we're reading this TU, and
5170 the TU has an entry in .gdb_index, replace the recorded data from
5171 .gdb_index with this TU. */
5173 find_sig_entry.signature = sig;
5174 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5175 &find_sig_entry, INSERT);
5176 sig_entry = (struct signatured_type *) *slot;
5178 /* We can get here with the TU already read, *or* in the process of being
5179 read. Don't reassign the global entry to point to this DWO if that's
5180 the case. Also note that if the TU is already being read, it may not
5181 have come from a DWO, the program may be a mix of Fission-compiled
5182 code and non-Fission-compiled code. */
5184 /* Have we already tried to read this TU?
5185 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
5186 needn't exist in the global table yet). */
5187 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
5190 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
5191 dwo_unit of the TU itself. */
5192 dwo_file = cu->dwo_unit->dwo_file;
5194 /* Ok, this is the first time we're reading this TU. */
5195 if (dwo_file->tus == NULL)
5197 find_dwo_entry.signature = sig;
5198 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
5199 if (dwo_entry == NULL)
5202 /* If the global table doesn't have an entry for this TU, add one. */
5203 if (sig_entry == NULL)
5204 sig_entry = add_type_unit (sig, slot);
5206 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
5207 sig_entry->per_cu.tu_read = 1;
5211 /* Subroutine of lookup_signatured_type.
5212 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
5213 then try the DWP file. If the TU stub (skeleton) has been removed then
5214 it won't be in .gdb_index. */
5216 static struct signatured_type *
5217 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5219 struct objfile *objfile = dwarf2_per_objfile->objfile;
5220 struct dwp_file *dwp_file = get_dwp_file ();
5221 struct dwo_unit *dwo_entry;
5222 struct signatured_type find_sig_entry, *sig_entry;
5225 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
5226 gdb_assert (dwp_file != NULL);
5228 /* If TU skeletons have been removed then we may not have read in any
5230 if (dwarf2_per_objfile->signatured_types == NULL)
5232 dwarf2_per_objfile->signatured_types
5233 = allocate_signatured_type_table (objfile);
5236 find_sig_entry.signature = sig;
5237 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5238 &find_sig_entry, INSERT);
5239 sig_entry = (struct signatured_type *) *slot;
5241 /* Have we already tried to read this TU?
5242 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
5243 needn't exist in the global table yet). */
5244 if (sig_entry != NULL)
5247 if (dwp_file->tus == NULL)
5249 dwo_entry = lookup_dwo_unit_in_dwp (dwp_file, NULL,
5250 sig, 1 /* is_debug_types */);
5251 if (dwo_entry == NULL)
5254 sig_entry = add_type_unit (sig, slot);
5255 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
5260 /* Lookup a signature based type for DW_FORM_ref_sig8.
5261 Returns NULL if signature SIG is not present in the table.
5262 It is up to the caller to complain about this. */
5264 static struct signatured_type *
5265 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5268 && dwarf2_per_objfile->using_index)
5270 /* We're in a DWO/DWP file, and we're using .gdb_index.
5271 These cases require special processing. */
5272 if (get_dwp_file () == NULL)
5273 return lookup_dwo_signatured_type (cu, sig);
5275 return lookup_dwp_signatured_type (cu, sig);
5279 struct signatured_type find_entry, *entry;
5281 if (dwarf2_per_objfile->signatured_types == NULL)
5283 find_entry.signature = sig;
5284 entry = ((struct signatured_type *)
5285 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
5290 /* Low level DIE reading support. */
5292 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
5295 init_cu_die_reader (struct die_reader_specs *reader,
5296 struct dwarf2_cu *cu,
5297 struct dwarf2_section_info *section,
5298 struct dwo_file *dwo_file)
5300 gdb_assert (section->readin && section->buffer != NULL);
5301 reader->abfd = get_section_bfd_owner (section);
5303 reader->dwo_file = dwo_file;
5304 reader->die_section = section;
5305 reader->buffer = section->buffer;
5306 reader->buffer_end = section->buffer + section->size;
5307 reader->comp_dir = NULL;
5310 /* Subroutine of init_cutu_and_read_dies to simplify it.
5311 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
5312 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
5315 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
5316 from it to the DIE in the DWO. If NULL we are skipping the stub.
5317 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
5318 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
5319 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
5320 STUB_COMP_DIR may be non-NULL.
5321 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
5322 are filled in with the info of the DIE from the DWO file.
5323 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
5324 provided an abbrev table to use.
5325 The result is non-zero if a valid (non-dummy) DIE was found. */
5328 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
5329 struct dwo_unit *dwo_unit,
5330 int abbrev_table_provided,
5331 struct die_info *stub_comp_unit_die,
5332 const char *stub_comp_dir,
5333 struct die_reader_specs *result_reader,
5334 const gdb_byte **result_info_ptr,
5335 struct die_info **result_comp_unit_die,
5336 int *result_has_children)
5338 struct objfile *objfile = dwarf2_per_objfile->objfile;
5339 struct dwarf2_cu *cu = this_cu->cu;
5340 struct dwarf2_section_info *section;
5342 const gdb_byte *begin_info_ptr, *info_ptr;
5343 ULONGEST signature; /* Or dwo_id. */
5344 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
5345 int i,num_extra_attrs;
5346 struct dwarf2_section_info *dwo_abbrev_section;
5347 struct attribute *attr;
5348 struct die_info *comp_unit_die;
5350 /* At most one of these may be provided. */
5351 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
5353 /* These attributes aren't processed until later:
5354 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
5355 DW_AT_comp_dir is used now, to find the DWO file, but it is also
5356 referenced later. However, these attributes are found in the stub
5357 which we won't have later. In order to not impose this complication
5358 on the rest of the code, we read them here and copy them to the
5367 if (stub_comp_unit_die != NULL)
5369 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
5371 if (! this_cu->is_debug_types)
5372 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
5373 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
5374 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
5375 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
5376 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
5378 /* There should be a DW_AT_addr_base attribute here (if needed).
5379 We need the value before we can process DW_FORM_GNU_addr_index. */
5381 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
5383 cu->addr_base = DW_UNSND (attr);
5385 /* There should be a DW_AT_ranges_base attribute here (if needed).
5386 We need the value before we can process DW_AT_ranges. */
5387 cu->ranges_base = 0;
5388 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
5390 cu->ranges_base = DW_UNSND (attr);
5392 else if (stub_comp_dir != NULL)
5394 /* Reconstruct the comp_dir attribute to simplify the code below. */
5395 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
5396 comp_dir->name = DW_AT_comp_dir;
5397 comp_dir->form = DW_FORM_string;
5398 DW_STRING_IS_CANONICAL (comp_dir) = 0;
5399 DW_STRING (comp_dir) = stub_comp_dir;
5402 /* Set up for reading the DWO CU/TU. */
5403 cu->dwo_unit = dwo_unit;
5404 section = dwo_unit->section;
5405 dwarf2_read_section (objfile, section);
5406 abfd = get_section_bfd_owner (section);
5407 begin_info_ptr = info_ptr = (section->buffer
5408 + to_underlying (dwo_unit->sect_off));
5409 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
5410 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
5412 if (this_cu->is_debug_types)
5414 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
5416 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5418 info_ptr, rcuh_kind::TYPE);
5419 /* This is not an assert because it can be caused by bad debug info. */
5420 if (sig_type->signature != cu->header.signature)
5422 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
5423 " TU at offset 0x%x [in module %s]"),
5424 hex_string (sig_type->signature),
5425 hex_string (cu->header.signature),
5426 to_underlying (dwo_unit->sect_off),
5427 bfd_get_filename (abfd));
5429 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
5430 /* For DWOs coming from DWP files, we don't know the CU length
5431 nor the type's offset in the TU until now. */
5432 dwo_unit->length = get_cu_length (&cu->header);
5433 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
5435 /* Establish the type offset that can be used to lookup the type.
5436 For DWO files, we don't know it until now. */
5437 sig_type->type_offset_in_section
5438 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
5442 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5444 info_ptr, rcuh_kind::COMPILE);
5445 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
5446 /* For DWOs coming from DWP files, we don't know the CU length
5448 dwo_unit->length = get_cu_length (&cu->header);
5451 /* Replace the CU's original abbrev table with the DWO's.
5452 Reminder: We can't read the abbrev table until we've read the header. */
5453 if (abbrev_table_provided)
5455 /* Don't free the provided abbrev table, the caller of
5456 init_cutu_and_read_dies owns it. */
5457 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5458 /* Ensure the DWO abbrev table gets freed. */
5459 make_cleanup (dwarf2_free_abbrev_table, cu);
5463 dwarf2_free_abbrev_table (cu);
5464 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
5465 /* Leave any existing abbrev table cleanup as is. */
5468 /* Read in the die, but leave space to copy over the attributes
5469 from the stub. This has the benefit of simplifying the rest of
5470 the code - all the work to maintain the illusion of a single
5471 DW_TAG_{compile,type}_unit DIE is done here. */
5472 num_extra_attrs = ((stmt_list != NULL)
5476 + (comp_dir != NULL));
5477 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
5478 result_has_children, num_extra_attrs);
5480 /* Copy over the attributes from the stub to the DIE we just read in. */
5481 comp_unit_die = *result_comp_unit_die;
5482 i = comp_unit_die->num_attrs;
5483 if (stmt_list != NULL)
5484 comp_unit_die->attrs[i++] = *stmt_list;
5486 comp_unit_die->attrs[i++] = *low_pc;
5487 if (high_pc != NULL)
5488 comp_unit_die->attrs[i++] = *high_pc;
5490 comp_unit_die->attrs[i++] = *ranges;
5491 if (comp_dir != NULL)
5492 comp_unit_die->attrs[i++] = *comp_dir;
5493 comp_unit_die->num_attrs += num_extra_attrs;
5495 if (dwarf_die_debug)
5497 fprintf_unfiltered (gdb_stdlog,
5498 "Read die from %s@0x%x of %s:\n",
5499 get_section_name (section),
5500 (unsigned) (begin_info_ptr - section->buffer),
5501 bfd_get_filename (abfd));
5502 dump_die (comp_unit_die, dwarf_die_debug);
5505 /* Save the comp_dir attribute. If there is no DWP file then we'll read
5506 TUs by skipping the stub and going directly to the entry in the DWO file.
5507 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
5508 to get it via circuitous means. Blech. */
5509 if (comp_dir != NULL)
5510 result_reader->comp_dir = DW_STRING (comp_dir);
5512 /* Skip dummy compilation units. */
5513 if (info_ptr >= begin_info_ptr + dwo_unit->length
5514 || peek_abbrev_code (abfd, info_ptr) == 0)
5517 *result_info_ptr = info_ptr;
5521 /* Subroutine of init_cutu_and_read_dies to simplify it.
5522 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
5523 Returns NULL if the specified DWO unit cannot be found. */
5525 static struct dwo_unit *
5526 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
5527 struct die_info *comp_unit_die)
5529 struct dwarf2_cu *cu = this_cu->cu;
5530 struct attribute *attr;
5532 struct dwo_unit *dwo_unit;
5533 const char *comp_dir, *dwo_name;
5535 gdb_assert (cu != NULL);
5537 /* Yeah, we look dwo_name up again, but it simplifies the code. */
5538 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5539 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
5541 if (this_cu->is_debug_types)
5543 struct signatured_type *sig_type;
5545 /* Since this_cu is the first member of struct signatured_type,
5546 we can go from a pointer to one to a pointer to the other. */
5547 sig_type = (struct signatured_type *) this_cu;
5548 signature = sig_type->signature;
5549 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
5553 struct attribute *attr;
5555 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
5557 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
5559 dwo_name, objfile_name (this_cu->objfile));
5560 signature = DW_UNSND (attr);
5561 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
5568 /* Subroutine of init_cutu_and_read_dies to simplify it.
5569 See it for a description of the parameters.
5570 Read a TU directly from a DWO file, bypassing the stub.
5572 Note: This function could be a little bit simpler if we shared cleanups
5573 with our caller, init_cutu_and_read_dies. That's generally a fragile thing
5574 to do, so we keep this function self-contained. Or we could move this
5575 into our caller, but it's complex enough already. */
5578 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
5579 int use_existing_cu, int keep,
5580 die_reader_func_ftype *die_reader_func,
5583 struct dwarf2_cu *cu;
5584 struct signatured_type *sig_type;
5585 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5586 struct die_reader_specs reader;
5587 const gdb_byte *info_ptr;
5588 struct die_info *comp_unit_die;
5591 /* Verify we can do the following downcast, and that we have the
5593 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
5594 sig_type = (struct signatured_type *) this_cu;
5595 gdb_assert (sig_type->dwo_unit != NULL);
5597 cleanups = make_cleanup (null_cleanup, NULL);
5599 if (use_existing_cu && this_cu->cu != NULL)
5601 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
5603 /* There's no need to do the rereading_dwo_cu handling that
5604 init_cutu_and_read_dies does since we don't read the stub. */
5608 /* If !use_existing_cu, this_cu->cu must be NULL. */
5609 gdb_assert (this_cu->cu == NULL);
5610 cu = XNEW (struct dwarf2_cu);
5611 init_one_comp_unit (cu, this_cu);
5612 /* If an error occurs while loading, release our storage. */
5613 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5616 /* A future optimization, if needed, would be to use an existing
5617 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
5618 could share abbrev tables. */
5620 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
5621 0 /* abbrev_table_provided */,
5622 NULL /* stub_comp_unit_die */,
5623 sig_type->dwo_unit->dwo_file->comp_dir,
5625 &comp_unit_die, &has_children) == 0)
5628 do_cleanups (cleanups);
5632 /* All the "real" work is done here. */
5633 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5635 /* This duplicates the code in init_cutu_and_read_dies,
5636 but the alternative is making the latter more complex.
5637 This function is only for the special case of using DWO files directly:
5638 no point in overly complicating the general case just to handle this. */
5639 if (free_cu_cleanup != NULL)
5643 /* We've successfully allocated this compilation unit. Let our
5644 caller clean it up when finished with it. */
5645 discard_cleanups (free_cu_cleanup);
5647 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5648 So we have to manually free the abbrev table. */
5649 dwarf2_free_abbrev_table (cu);
5651 /* Link this CU into read_in_chain. */
5652 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5653 dwarf2_per_objfile->read_in_chain = this_cu;
5656 do_cleanups (free_cu_cleanup);
5659 do_cleanups (cleanups);
5662 /* Initialize a CU (or TU) and read its DIEs.
5663 If the CU defers to a DWO file, read the DWO file as well.
5665 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
5666 Otherwise the table specified in the comp unit header is read in and used.
5667 This is an optimization for when we already have the abbrev table.
5669 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
5670 Otherwise, a new CU is allocated with xmalloc.
5672 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
5673 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
5675 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5676 linker) then DIE_READER_FUNC will not get called. */
5679 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
5680 struct abbrev_table *abbrev_table,
5681 int use_existing_cu, int keep,
5682 die_reader_func_ftype *die_reader_func,
5685 struct objfile *objfile = dwarf2_per_objfile->objfile;
5686 struct dwarf2_section_info *section = this_cu->section;
5687 bfd *abfd = get_section_bfd_owner (section);
5688 struct dwarf2_cu *cu;
5689 const gdb_byte *begin_info_ptr, *info_ptr;
5690 struct die_reader_specs reader;
5691 struct die_info *comp_unit_die;
5693 struct attribute *attr;
5694 struct cleanup *cleanups, *free_cu_cleanup = NULL;
5695 struct signatured_type *sig_type = NULL;
5696 struct dwarf2_section_info *abbrev_section;
5697 /* Non-zero if CU currently points to a DWO file and we need to
5698 reread it. When this happens we need to reread the skeleton die
5699 before we can reread the DWO file (this only applies to CUs, not TUs). */
5700 int rereading_dwo_cu = 0;
5702 if (dwarf_die_debug)
5703 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5704 this_cu->is_debug_types ? "type" : "comp",
5705 to_underlying (this_cu->sect_off));
5707 if (use_existing_cu)
5710 /* If we're reading a TU directly from a DWO file, including a virtual DWO
5711 file (instead of going through the stub), short-circuit all of this. */
5712 if (this_cu->reading_dwo_directly)
5714 /* Narrow down the scope of possibilities to have to understand. */
5715 gdb_assert (this_cu->is_debug_types);
5716 gdb_assert (abbrev_table == NULL);
5717 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
5718 die_reader_func, data);
5722 cleanups = make_cleanup (null_cleanup, NULL);
5724 /* This is cheap if the section is already read in. */
5725 dwarf2_read_section (objfile, section);
5727 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
5729 abbrev_section = get_abbrev_section_for_cu (this_cu);
5731 if (use_existing_cu && this_cu->cu != NULL)
5734 /* If this CU is from a DWO file we need to start over, we need to
5735 refetch the attributes from the skeleton CU.
5736 This could be optimized by retrieving those attributes from when we
5737 were here the first time: the previous comp_unit_die was stored in
5738 comp_unit_obstack. But there's no data yet that we need this
5740 if (cu->dwo_unit != NULL)
5741 rereading_dwo_cu = 1;
5745 /* If !use_existing_cu, this_cu->cu must be NULL. */
5746 gdb_assert (this_cu->cu == NULL);
5747 cu = XNEW (struct dwarf2_cu);
5748 init_one_comp_unit (cu, this_cu);
5749 /* If an error occurs while loading, release our storage. */
5750 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5753 /* Get the header. */
5754 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
5756 /* We already have the header, there's no need to read it in again. */
5757 info_ptr += to_underlying (cu->header.first_die_cu_offset);
5761 if (this_cu->is_debug_types)
5763 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5764 abbrev_section, info_ptr,
5767 /* Since per_cu is the first member of struct signatured_type,
5768 we can go from a pointer to one to a pointer to the other. */
5769 sig_type = (struct signatured_type *) this_cu;
5770 gdb_assert (sig_type->signature == cu->header.signature);
5771 gdb_assert (sig_type->type_offset_in_tu
5772 == cu->header.type_cu_offset_in_tu);
5773 gdb_assert (this_cu->sect_off == cu->header.sect_off);
5775 /* LENGTH has not been set yet for type units if we're
5776 using .gdb_index. */
5777 this_cu->length = get_cu_length (&cu->header);
5779 /* Establish the type offset that can be used to lookup the type. */
5780 sig_type->type_offset_in_section =
5781 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
5783 this_cu->dwarf_version = cu->header.version;
5787 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5790 rcuh_kind::COMPILE);
5792 gdb_assert (this_cu->sect_off == cu->header.sect_off);
5793 gdb_assert (this_cu->length == get_cu_length (&cu->header));
5794 this_cu->dwarf_version = cu->header.version;
5798 /* Skip dummy compilation units. */
5799 if (info_ptr >= begin_info_ptr + this_cu->length
5800 || peek_abbrev_code (abfd, info_ptr) == 0)
5802 do_cleanups (cleanups);
5806 /* If we don't have them yet, read the abbrevs for this compilation unit.
5807 And if we need to read them now, make sure they're freed when we're
5808 done. Note that it's important that if the CU had an abbrev table
5809 on entry we don't free it when we're done: Somewhere up the call stack
5810 it may be in use. */
5811 if (abbrev_table != NULL)
5813 gdb_assert (cu->abbrev_table == NULL);
5814 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
5815 cu->abbrev_table = abbrev_table;
5817 else if (cu->abbrev_table == NULL)
5819 dwarf2_read_abbrevs (cu, abbrev_section);
5820 make_cleanup (dwarf2_free_abbrev_table, cu);
5822 else if (rereading_dwo_cu)
5824 dwarf2_free_abbrev_table (cu);
5825 dwarf2_read_abbrevs (cu, abbrev_section);
5828 /* Read the top level CU/TU die. */
5829 init_cu_die_reader (&reader, cu, section, NULL);
5830 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5832 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
5834 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
5835 DWO CU, that this test will fail (the attribute will not be present). */
5836 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5839 struct dwo_unit *dwo_unit;
5840 struct die_info *dwo_comp_unit_die;
5844 complaint (&symfile_complaints,
5845 _("compilation unit with DW_AT_GNU_dwo_name"
5846 " has children (offset 0x%x) [in module %s]"),
5847 to_underlying (this_cu->sect_off), bfd_get_filename (abfd));
5849 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
5850 if (dwo_unit != NULL)
5852 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
5853 abbrev_table != NULL,
5854 comp_unit_die, NULL,
5856 &dwo_comp_unit_die, &has_children) == 0)
5859 do_cleanups (cleanups);
5862 comp_unit_die = dwo_comp_unit_die;
5866 /* Yikes, we couldn't find the rest of the DIE, we only have
5867 the stub. A complaint has already been logged. There's
5868 not much more we can do except pass on the stub DIE to
5869 die_reader_func. We don't want to throw an error on bad
5874 /* All of the above is setup for this call. Yikes. */
5875 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5877 /* Done, clean up. */
5878 if (free_cu_cleanup != NULL)
5882 /* We've successfully allocated this compilation unit. Let our
5883 caller clean it up when finished with it. */
5884 discard_cleanups (free_cu_cleanup);
5886 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5887 So we have to manually free the abbrev table. */
5888 dwarf2_free_abbrev_table (cu);
5890 /* Link this CU into read_in_chain. */
5891 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5892 dwarf2_per_objfile->read_in_chain = this_cu;
5895 do_cleanups (free_cu_cleanup);
5898 do_cleanups (cleanups);
5901 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
5902 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
5903 to have already done the lookup to find the DWO file).
5905 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
5906 THIS_CU->is_debug_types, but nothing else.
5908 We fill in THIS_CU->length.
5910 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5911 linker) then DIE_READER_FUNC will not get called.
5913 THIS_CU->cu is always freed when done.
5914 This is done in order to not leave THIS_CU->cu in a state where we have
5915 to care whether it refers to the "main" CU or the DWO CU. */
5918 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
5919 struct dwo_file *dwo_file,
5920 die_reader_func_ftype *die_reader_func,
5923 struct objfile *objfile = dwarf2_per_objfile->objfile;
5924 struct dwarf2_section_info *section = this_cu->section;
5925 bfd *abfd = get_section_bfd_owner (section);
5926 struct dwarf2_section_info *abbrev_section;
5927 struct dwarf2_cu cu;
5928 const gdb_byte *begin_info_ptr, *info_ptr;
5929 struct die_reader_specs reader;
5930 struct cleanup *cleanups;
5931 struct die_info *comp_unit_die;
5934 if (dwarf_die_debug)
5935 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5936 this_cu->is_debug_types ? "type" : "comp",
5937 to_underlying (this_cu->sect_off));
5939 gdb_assert (this_cu->cu == NULL);
5941 abbrev_section = (dwo_file != NULL
5942 ? &dwo_file->sections.abbrev
5943 : get_abbrev_section_for_cu (this_cu));
5945 /* This is cheap if the section is already read in. */
5946 dwarf2_read_section (objfile, section);
5948 init_one_comp_unit (&cu, this_cu);
5950 cleanups = make_cleanup (free_stack_comp_unit, &cu);
5952 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
5953 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
5954 abbrev_section, info_ptr,
5955 (this_cu->is_debug_types
5957 : rcuh_kind::COMPILE));
5959 this_cu->length = get_cu_length (&cu.header);
5961 /* Skip dummy compilation units. */
5962 if (info_ptr >= begin_info_ptr + this_cu->length
5963 || peek_abbrev_code (abfd, info_ptr) == 0)
5965 do_cleanups (cleanups);
5969 dwarf2_read_abbrevs (&cu, abbrev_section);
5970 make_cleanup (dwarf2_free_abbrev_table, &cu);
5972 init_cu_die_reader (&reader, &cu, section, dwo_file);
5973 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5975 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5977 do_cleanups (cleanups);
5980 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
5981 does not lookup the specified DWO file.
5982 This cannot be used to read DWO files.
5984 THIS_CU->cu is always freed when done.
5985 This is done in order to not leave THIS_CU->cu in a state where we have
5986 to care whether it refers to the "main" CU or the DWO CU.
5987 We can revisit this if the data shows there's a performance issue. */
5990 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
5991 die_reader_func_ftype *die_reader_func,
5994 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
5997 /* Type Unit Groups.
5999 Type Unit Groups are a way to collapse the set of all TUs (type units) into
6000 a more manageable set. The grouping is done by DW_AT_stmt_list entry
6001 so that all types coming from the same compilation (.o file) are grouped
6002 together. A future step could be to put the types in the same symtab as
6003 the CU the types ultimately came from. */
6006 hash_type_unit_group (const void *item)
6008 const struct type_unit_group *tu_group
6009 = (const struct type_unit_group *) item;
6011 return hash_stmt_list_entry (&tu_group->hash);
6015 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
6017 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
6018 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
6020 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
6023 /* Allocate a hash table for type unit groups. */
6026 allocate_type_unit_groups_table (void)
6028 return htab_create_alloc_ex (3,
6029 hash_type_unit_group,
6032 &dwarf2_per_objfile->objfile->objfile_obstack,
6033 hashtab_obstack_allocate,
6034 dummy_obstack_deallocate);
6037 /* Type units that don't have DW_AT_stmt_list are grouped into their own
6038 partial symtabs. We combine several TUs per psymtab to not let the size
6039 of any one psymtab grow too big. */
6040 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
6041 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
6043 /* Helper routine for get_type_unit_group.
6044 Create the type_unit_group object used to hold one or more TUs. */
6046 static struct type_unit_group *
6047 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
6049 struct objfile *objfile = dwarf2_per_objfile->objfile;
6050 struct dwarf2_per_cu_data *per_cu;
6051 struct type_unit_group *tu_group;
6053 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6054 struct type_unit_group);
6055 per_cu = &tu_group->per_cu;
6056 per_cu->objfile = objfile;
6058 if (dwarf2_per_objfile->using_index)
6060 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6061 struct dwarf2_per_cu_quick_data);
6065 unsigned int line_offset = to_underlying (line_offset_struct);
6066 struct partial_symtab *pst;
6069 /* Give the symtab a useful name for debug purposes. */
6070 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
6071 name = xstrprintf ("<type_units_%d>",
6072 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
6074 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
6076 pst = create_partial_symtab (per_cu, name);
6082 tu_group->hash.dwo_unit = cu->dwo_unit;
6083 tu_group->hash.line_sect_off = line_offset_struct;
6088 /* Look up the type_unit_group for type unit CU, and create it if necessary.
6089 STMT_LIST is a DW_AT_stmt_list attribute. */
6091 static struct type_unit_group *
6092 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
6094 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6095 struct type_unit_group *tu_group;
6097 unsigned int line_offset;
6098 struct type_unit_group type_unit_group_for_lookup;
6100 if (dwarf2_per_objfile->type_unit_groups == NULL)
6102 dwarf2_per_objfile->type_unit_groups =
6103 allocate_type_unit_groups_table ();
6106 /* Do we need to create a new group, or can we use an existing one? */
6110 line_offset = DW_UNSND (stmt_list);
6111 ++tu_stats->nr_symtab_sharers;
6115 /* Ugh, no stmt_list. Rare, but we have to handle it.
6116 We can do various things here like create one group per TU or
6117 spread them over multiple groups to split up the expansion work.
6118 To avoid worst case scenarios (too many groups or too large groups)
6119 we, umm, group them in bunches. */
6120 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
6121 | (tu_stats->nr_stmt_less_type_units
6122 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
6123 ++tu_stats->nr_stmt_less_type_units;
6126 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
6127 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
6128 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
6129 &type_unit_group_for_lookup, INSERT);
6132 tu_group = (struct type_unit_group *) *slot;
6133 gdb_assert (tu_group != NULL);
6137 sect_offset line_offset_struct = (sect_offset) line_offset;
6138 tu_group = create_type_unit_group (cu, line_offset_struct);
6140 ++tu_stats->nr_symtabs;
6146 /* Partial symbol tables. */
6148 /* Create a psymtab named NAME and assign it to PER_CU.
6150 The caller must fill in the following details:
6151 dirname, textlow, texthigh. */
6153 static struct partial_symtab *
6154 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
6156 struct objfile *objfile = per_cu->objfile;
6157 struct partial_symtab *pst;
6159 pst = start_psymtab_common (objfile, name, 0,
6160 objfile->global_psymbols.next,
6161 objfile->static_psymbols.next);
6163 pst->psymtabs_addrmap_supported = 1;
6165 /* This is the glue that links PST into GDB's symbol API. */
6166 pst->read_symtab_private = per_cu;
6167 pst->read_symtab = dwarf2_read_symtab;
6168 per_cu->v.psymtab = pst;
6173 /* The DATA object passed to process_psymtab_comp_unit_reader has this
6176 struct process_psymtab_comp_unit_data
6178 /* True if we are reading a DW_TAG_partial_unit. */
6180 int want_partial_unit;
6182 /* The "pretend" language that is used if the CU doesn't declare a
6185 enum language pretend_language;
6188 /* die_reader_func for process_psymtab_comp_unit. */
6191 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
6192 const gdb_byte *info_ptr,
6193 struct die_info *comp_unit_die,
6197 struct dwarf2_cu *cu = reader->cu;
6198 struct objfile *objfile = cu->objfile;
6199 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6200 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6202 CORE_ADDR best_lowpc = 0, best_highpc = 0;
6203 struct partial_symtab *pst;
6204 enum pc_bounds_kind cu_bounds_kind;
6205 const char *filename;
6206 struct process_psymtab_comp_unit_data *info
6207 = (struct process_psymtab_comp_unit_data *) data;
6209 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
6212 gdb_assert (! per_cu->is_debug_types);
6214 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
6216 cu->list_in_scope = &file_symbols;
6218 /* Allocate a new partial symbol table structure. */
6219 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
6220 if (filename == NULL)
6223 pst = create_partial_symtab (per_cu, filename);
6225 /* This must be done before calling dwarf2_build_include_psymtabs. */
6226 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
6228 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6230 dwarf2_find_base_address (comp_unit_die, cu);
6232 /* Possibly set the default values of LOWPC and HIGHPC from
6234 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
6235 &best_highpc, cu, pst);
6236 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
6237 /* Store the contiguous range if it is not empty; it can be empty for
6238 CUs with no code. */
6239 addrmap_set_empty (objfile->psymtabs_addrmap,
6240 gdbarch_adjust_dwarf2_addr (gdbarch,
6241 best_lowpc + baseaddr),
6242 gdbarch_adjust_dwarf2_addr (gdbarch,
6243 best_highpc + baseaddr) - 1,
6246 /* Check if comp unit has_children.
6247 If so, read the rest of the partial symbols from this comp unit.
6248 If not, there's no more debug_info for this comp unit. */
6251 struct partial_die_info *first_die;
6252 CORE_ADDR lowpc, highpc;
6254 lowpc = ((CORE_ADDR) -1);
6255 highpc = ((CORE_ADDR) 0);
6257 first_die = load_partial_dies (reader, info_ptr, 1);
6259 scan_partial_symbols (first_die, &lowpc, &highpc,
6260 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
6262 /* If we didn't find a lowpc, set it to highpc to avoid
6263 complaints from `maint check'. */
6264 if (lowpc == ((CORE_ADDR) -1))
6267 /* If the compilation unit didn't have an explicit address range,
6268 then use the information extracted from its child dies. */
6269 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
6272 best_highpc = highpc;
6275 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
6276 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
6278 end_psymtab_common (objfile, pst);
6280 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
6283 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6284 struct dwarf2_per_cu_data *iter;
6286 /* Fill in 'dependencies' here; we fill in 'users' in a
6288 pst->number_of_dependencies = len;
6290 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
6292 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
6295 pst->dependencies[i] = iter->v.psymtab;
6297 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6300 /* Get the list of files included in the current compilation unit,
6301 and build a psymtab for each of them. */
6302 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
6304 if (dwarf_read_debug)
6306 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6308 fprintf_unfiltered (gdb_stdlog,
6309 "Psymtab for %s unit @0x%x: %s - %s"
6310 ", %d global, %d static syms\n",
6311 per_cu->is_debug_types ? "type" : "comp",
6312 to_underlying (per_cu->sect_off),
6313 paddress (gdbarch, pst->textlow),
6314 paddress (gdbarch, pst->texthigh),
6315 pst->n_global_syms, pst->n_static_syms);
6319 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6320 Process compilation unit THIS_CU for a psymtab. */
6323 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
6324 int want_partial_unit,
6325 enum language pretend_language)
6327 /* If this compilation unit was already read in, free the
6328 cached copy in order to read it in again. This is
6329 necessary because we skipped some symbols when we first
6330 read in the compilation unit (see load_partial_dies).
6331 This problem could be avoided, but the benefit is unclear. */
6332 if (this_cu->cu != NULL)
6333 free_one_cached_comp_unit (this_cu);
6335 if (this_cu->is_debug_types)
6336 init_cutu_and_read_dies (this_cu, NULL, 0, 0, build_type_psymtabs_reader,
6340 process_psymtab_comp_unit_data info;
6341 info.want_partial_unit = want_partial_unit;
6342 info.pretend_language = pretend_language;
6343 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
6344 process_psymtab_comp_unit_reader, &info);
6347 /* Age out any secondary CUs. */
6348 age_cached_comp_units ();
6351 /* Reader function for build_type_psymtabs. */
6354 build_type_psymtabs_reader (const struct die_reader_specs *reader,
6355 const gdb_byte *info_ptr,
6356 struct die_info *type_unit_die,
6360 struct objfile *objfile = dwarf2_per_objfile->objfile;
6361 struct dwarf2_cu *cu = reader->cu;
6362 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6363 struct signatured_type *sig_type;
6364 struct type_unit_group *tu_group;
6365 struct attribute *attr;
6366 struct partial_die_info *first_die;
6367 CORE_ADDR lowpc, highpc;
6368 struct partial_symtab *pst;
6370 gdb_assert (data == NULL);
6371 gdb_assert (per_cu->is_debug_types);
6372 sig_type = (struct signatured_type *) per_cu;
6377 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
6378 tu_group = get_type_unit_group (cu, attr);
6380 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
6382 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
6383 cu->list_in_scope = &file_symbols;
6384 pst = create_partial_symtab (per_cu, "");
6387 first_die = load_partial_dies (reader, info_ptr, 1);
6389 lowpc = (CORE_ADDR) -1;
6390 highpc = (CORE_ADDR) 0;
6391 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
6393 end_psymtab_common (objfile, pst);
6396 /* Struct used to sort TUs by their abbreviation table offset. */
6398 struct tu_abbrev_offset
6400 struct signatured_type *sig_type;
6401 sect_offset abbrev_offset;
6404 /* Helper routine for build_type_psymtabs_1, passed to qsort. */
6407 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
6409 const struct tu_abbrev_offset * const *a
6410 = (const struct tu_abbrev_offset * const*) ap;
6411 const struct tu_abbrev_offset * const *b
6412 = (const struct tu_abbrev_offset * const*) bp;
6413 sect_offset aoff = (*a)->abbrev_offset;
6414 sect_offset boff = (*b)->abbrev_offset;
6416 return (aoff > boff) - (aoff < boff);
6419 /* Efficiently read all the type units.
6420 This does the bulk of the work for build_type_psymtabs.
6422 The efficiency is because we sort TUs by the abbrev table they use and
6423 only read each abbrev table once. In one program there are 200K TUs
6424 sharing 8K abbrev tables.
6426 The main purpose of this function is to support building the
6427 dwarf2_per_objfile->type_unit_groups table.
6428 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
6429 can collapse the search space by grouping them by stmt_list.
6430 The savings can be significant, in the same program from above the 200K TUs
6431 share 8K stmt_list tables.
6433 FUNC is expected to call get_type_unit_group, which will create the
6434 struct type_unit_group if necessary and add it to
6435 dwarf2_per_objfile->type_unit_groups. */
6438 build_type_psymtabs_1 (void)
6440 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6441 struct cleanup *cleanups;
6442 struct abbrev_table *abbrev_table;
6443 sect_offset abbrev_offset;
6444 struct tu_abbrev_offset *sorted_by_abbrev;
6447 /* It's up to the caller to not call us multiple times. */
6448 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
6450 if (dwarf2_per_objfile->n_type_units == 0)
6453 /* TUs typically share abbrev tables, and there can be way more TUs than
6454 abbrev tables. Sort by abbrev table to reduce the number of times we
6455 read each abbrev table in.
6456 Alternatives are to punt or to maintain a cache of abbrev tables.
6457 This is simpler and efficient enough for now.
6459 Later we group TUs by their DW_AT_stmt_list value (as this defines the
6460 symtab to use). Typically TUs with the same abbrev offset have the same
6461 stmt_list value too so in practice this should work well.
6463 The basic algorithm here is:
6465 sort TUs by abbrev table
6466 for each TU with same abbrev table:
6467 read abbrev table if first user
6468 read TU top level DIE
6469 [IWBN if DWO skeletons had DW_AT_stmt_list]
6472 if (dwarf_read_debug)
6473 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
6475 /* Sort in a separate table to maintain the order of all_type_units
6476 for .gdb_index: TU indices directly index all_type_units. */
6477 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
6478 dwarf2_per_objfile->n_type_units);
6479 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
6481 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
6483 sorted_by_abbrev[i].sig_type = sig_type;
6484 sorted_by_abbrev[i].abbrev_offset =
6485 read_abbrev_offset (sig_type->per_cu.section,
6486 sig_type->per_cu.sect_off);
6488 cleanups = make_cleanup (xfree, sorted_by_abbrev);
6489 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
6490 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
6492 abbrev_offset = (sect_offset) ~(unsigned) 0;
6493 abbrev_table = NULL;
6494 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
6496 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
6498 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
6500 /* Switch to the next abbrev table if necessary. */
6501 if (abbrev_table == NULL
6502 || tu->abbrev_offset != abbrev_offset)
6504 if (abbrev_table != NULL)
6506 abbrev_table_free (abbrev_table);
6507 /* Reset to NULL in case abbrev_table_read_table throws
6508 an error: abbrev_table_free_cleanup will get called. */
6509 abbrev_table = NULL;
6511 abbrev_offset = tu->abbrev_offset;
6513 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
6515 ++tu_stats->nr_uniq_abbrev_tables;
6518 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
6519 build_type_psymtabs_reader, NULL);
6522 do_cleanups (cleanups);
6525 /* Print collected type unit statistics. */
6528 print_tu_stats (void)
6530 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6532 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
6533 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
6534 dwarf2_per_objfile->n_type_units);
6535 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
6536 tu_stats->nr_uniq_abbrev_tables);
6537 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
6538 tu_stats->nr_symtabs);
6539 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
6540 tu_stats->nr_symtab_sharers);
6541 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
6542 tu_stats->nr_stmt_less_type_units);
6543 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
6544 tu_stats->nr_all_type_units_reallocs);
6547 /* Traversal function for build_type_psymtabs. */
6550 build_type_psymtab_dependencies (void **slot, void *info)
6552 struct objfile *objfile = dwarf2_per_objfile->objfile;
6553 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
6554 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
6555 struct partial_symtab *pst = per_cu->v.psymtab;
6556 int len = VEC_length (sig_type_ptr, tu_group->tus);
6557 struct signatured_type *iter;
6560 gdb_assert (len > 0);
6561 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
6563 pst->number_of_dependencies = len;
6565 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
6567 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
6570 gdb_assert (iter->per_cu.is_debug_types);
6571 pst->dependencies[i] = iter->per_cu.v.psymtab;
6572 iter->type_unit_group = tu_group;
6575 VEC_free (sig_type_ptr, tu_group->tus);
6580 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6581 Build partial symbol tables for the .debug_types comp-units. */
6584 build_type_psymtabs (struct objfile *objfile)
6586 if (! create_all_type_units (objfile))
6589 build_type_psymtabs_1 ();
6592 /* Traversal function for process_skeletonless_type_unit.
6593 Read a TU in a DWO file and build partial symbols for it. */
6596 process_skeletonless_type_unit (void **slot, void *info)
6598 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
6599 struct objfile *objfile = (struct objfile *) info;
6600 struct signatured_type find_entry, *entry;
6602 /* If this TU doesn't exist in the global table, add it and read it in. */
6604 if (dwarf2_per_objfile->signatured_types == NULL)
6606 dwarf2_per_objfile->signatured_types
6607 = allocate_signatured_type_table (objfile);
6610 find_entry.signature = dwo_unit->signature;
6611 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
6613 /* If we've already seen this type there's nothing to do. What's happening
6614 is we're doing our own version of comdat-folding here. */
6618 /* This does the job that create_all_type_units would have done for
6620 entry = add_type_unit (dwo_unit->signature, slot);
6621 fill_in_sig_entry_from_dwo_entry (objfile, entry, dwo_unit);
6624 /* This does the job that build_type_psymtabs_1 would have done. */
6625 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0,
6626 build_type_psymtabs_reader, NULL);
6631 /* Traversal function for process_skeletonless_type_units. */
6634 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
6636 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
6638 if (dwo_file->tus != NULL)
6640 htab_traverse_noresize (dwo_file->tus,
6641 process_skeletonless_type_unit, info);
6647 /* Scan all TUs of DWO files, verifying we've processed them.
6648 This is needed in case a TU was emitted without its skeleton.
6649 Note: This can't be done until we know what all the DWO files are. */
6652 process_skeletonless_type_units (struct objfile *objfile)
6654 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
6655 if (get_dwp_file () == NULL
6656 && dwarf2_per_objfile->dwo_files != NULL)
6658 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
6659 process_dwo_file_for_skeletonless_type_units,
6664 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
6667 psymtabs_addrmap_cleanup (void *o)
6669 struct objfile *objfile = (struct objfile *) o;
6671 objfile->psymtabs_addrmap = NULL;
6674 /* Compute the 'user' field for each psymtab in OBJFILE. */
6677 set_partial_user (struct objfile *objfile)
6681 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6683 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6684 struct partial_symtab *pst = per_cu->v.psymtab;
6690 for (j = 0; j < pst->number_of_dependencies; ++j)
6692 /* Set the 'user' field only if it is not already set. */
6693 if (pst->dependencies[j]->user == NULL)
6694 pst->dependencies[j]->user = pst;
6699 /* Build the partial symbol table by doing a quick pass through the
6700 .debug_info and .debug_abbrev sections. */
6703 dwarf2_build_psymtabs_hard (struct objfile *objfile)
6705 struct cleanup *back_to, *addrmap_cleanup;
6708 if (dwarf_read_debug)
6710 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
6711 objfile_name (objfile));
6714 dwarf2_per_objfile->reading_partial_symbols = 1;
6716 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
6718 /* Any cached compilation units will be linked by the per-objfile
6719 read_in_chain. Make sure to free them when we're done. */
6720 back_to = make_cleanup (free_cached_comp_units, NULL);
6722 build_type_psymtabs (objfile);
6724 create_all_comp_units (objfile);
6726 /* Create a temporary address map on a temporary obstack. We later
6727 copy this to the final obstack. */
6728 auto_obstack temp_obstack;
6729 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
6730 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
6732 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6734 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6736 process_psymtab_comp_unit (per_cu, 0, language_minimal);
6739 /* This has to wait until we read the CUs, we need the list of DWOs. */
6740 process_skeletonless_type_units (objfile);
6742 /* Now that all TUs have been processed we can fill in the dependencies. */
6743 if (dwarf2_per_objfile->type_unit_groups != NULL)
6745 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
6746 build_type_psymtab_dependencies, NULL);
6749 if (dwarf_read_debug)
6752 set_partial_user (objfile);
6754 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
6755 &objfile->objfile_obstack);
6756 discard_cleanups (addrmap_cleanup);
6758 do_cleanups (back_to);
6760 if (dwarf_read_debug)
6761 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
6762 objfile_name (objfile));
6765 /* die_reader_func for load_partial_comp_unit. */
6768 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
6769 const gdb_byte *info_ptr,
6770 struct die_info *comp_unit_die,
6774 struct dwarf2_cu *cu = reader->cu;
6776 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
6778 /* Check if comp unit has_children.
6779 If so, read the rest of the partial symbols from this comp unit.
6780 If not, there's no more debug_info for this comp unit. */
6782 load_partial_dies (reader, info_ptr, 0);
6785 /* Load the partial DIEs for a secondary CU into memory.
6786 This is also used when rereading a primary CU with load_all_dies. */
6789 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
6791 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6792 load_partial_comp_unit_reader, NULL);
6796 read_comp_units_from_section (struct objfile *objfile,
6797 struct dwarf2_section_info *section,
6798 struct dwarf2_section_info *abbrev_section,
6799 unsigned int is_dwz,
6802 struct dwarf2_per_cu_data ***all_comp_units)
6804 const gdb_byte *info_ptr;
6805 bfd *abfd = get_section_bfd_owner (section);
6807 if (dwarf_read_debug)
6808 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
6809 get_section_name (section),
6810 get_section_file_name (section));
6812 dwarf2_read_section (objfile, section);
6814 info_ptr = section->buffer;
6816 while (info_ptr < section->buffer + section->size)
6818 struct dwarf2_per_cu_data *this_cu;
6820 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
6822 comp_unit_head cu_header;
6823 read_and_check_comp_unit_head (&cu_header, section, abbrev_section,
6824 info_ptr, rcuh_kind::COMPILE);
6826 /* Save the compilation unit for later lookup. */
6827 if (cu_header.unit_type != DW_UT_type)
6829 this_cu = XOBNEW (&objfile->objfile_obstack,
6830 struct dwarf2_per_cu_data);
6831 memset (this_cu, 0, sizeof (*this_cu));
6835 auto sig_type = XOBNEW (&objfile->objfile_obstack,
6836 struct signatured_type);
6837 memset (sig_type, 0, sizeof (*sig_type));
6838 sig_type->signature = cu_header.signature;
6839 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
6840 this_cu = &sig_type->per_cu;
6842 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
6843 this_cu->sect_off = sect_off;
6844 this_cu->length = cu_header.length + cu_header.initial_length_size;
6845 this_cu->is_dwz = is_dwz;
6846 this_cu->objfile = objfile;
6847 this_cu->section = section;
6849 if (*n_comp_units == *n_allocated)
6852 *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *,
6853 *all_comp_units, *n_allocated);
6855 (*all_comp_units)[*n_comp_units] = this_cu;
6858 info_ptr = info_ptr + this_cu->length;
6862 /* Create a list of all compilation units in OBJFILE.
6863 This is only done for -readnow and building partial symtabs. */
6866 create_all_comp_units (struct objfile *objfile)
6870 struct dwarf2_per_cu_data **all_comp_units;
6871 struct dwz_file *dwz;
6875 all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated);
6877 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info,
6878 &dwarf2_per_objfile->abbrev, 0,
6879 &n_allocated, &n_comp_units, &all_comp_units);
6881 dwz = dwarf2_get_dwz_file ();
6883 read_comp_units_from_section (objfile, &dwz->info, &dwz->abbrev, 1,
6884 &n_allocated, &n_comp_units,
6887 dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack,
6888 struct dwarf2_per_cu_data *,
6890 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
6891 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6892 xfree (all_comp_units);
6893 dwarf2_per_objfile->n_comp_units = n_comp_units;
6896 /* Process all loaded DIEs for compilation unit CU, starting at
6897 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
6898 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
6899 DW_AT_ranges). See the comments of add_partial_subprogram on how
6900 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
6903 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
6904 CORE_ADDR *highpc, int set_addrmap,
6905 struct dwarf2_cu *cu)
6907 struct partial_die_info *pdi;
6909 /* Now, march along the PDI's, descending into ones which have
6910 interesting children but skipping the children of the other ones,
6911 until we reach the end of the compilation unit. */
6917 fixup_partial_die (pdi, cu);
6919 /* Anonymous namespaces or modules have no name but have interesting
6920 children, so we need to look at them. Ditto for anonymous
6923 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
6924 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
6925 || pdi->tag == DW_TAG_imported_unit)
6929 case DW_TAG_subprogram:
6930 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
6932 case DW_TAG_constant:
6933 case DW_TAG_variable:
6934 case DW_TAG_typedef:
6935 case DW_TAG_union_type:
6936 if (!pdi->is_declaration)
6938 add_partial_symbol (pdi, cu);
6941 case DW_TAG_class_type:
6942 case DW_TAG_interface_type:
6943 case DW_TAG_structure_type:
6944 if (!pdi->is_declaration)
6946 add_partial_symbol (pdi, cu);
6948 if (cu->language == language_rust && pdi->has_children)
6949 scan_partial_symbols (pdi->die_child, lowpc, highpc,
6952 case DW_TAG_enumeration_type:
6953 if (!pdi->is_declaration)
6954 add_partial_enumeration (pdi, cu);
6956 case DW_TAG_base_type:
6957 case DW_TAG_subrange_type:
6958 /* File scope base type definitions are added to the partial
6960 add_partial_symbol (pdi, cu);
6962 case DW_TAG_namespace:
6963 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
6966 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
6968 case DW_TAG_imported_unit:
6970 struct dwarf2_per_cu_data *per_cu;
6972 /* For now we don't handle imported units in type units. */
6973 if (cu->per_cu->is_debug_types)
6975 error (_("Dwarf Error: DW_TAG_imported_unit is not"
6976 " supported in type units [in module %s]"),
6977 objfile_name (cu->objfile));
6980 per_cu = dwarf2_find_containing_comp_unit (pdi->d.sect_off,
6984 /* Go read the partial unit, if needed. */
6985 if (per_cu->v.psymtab == NULL)
6986 process_psymtab_comp_unit (per_cu, 1, cu->language);
6988 VEC_safe_push (dwarf2_per_cu_ptr,
6989 cu->per_cu->imported_symtabs, per_cu);
6992 case DW_TAG_imported_declaration:
6993 add_partial_symbol (pdi, cu);
7000 /* If the die has a sibling, skip to the sibling. */
7002 pdi = pdi->die_sibling;
7006 /* Functions used to compute the fully scoped name of a partial DIE.
7008 Normally, this is simple. For C++, the parent DIE's fully scoped
7009 name is concatenated with "::" and the partial DIE's name.
7010 Enumerators are an exception; they use the scope of their parent
7011 enumeration type, i.e. the name of the enumeration type is not
7012 prepended to the enumerator.
7014 There are two complexities. One is DW_AT_specification; in this
7015 case "parent" means the parent of the target of the specification,
7016 instead of the direct parent of the DIE. The other is compilers
7017 which do not emit DW_TAG_namespace; in this case we try to guess
7018 the fully qualified name of structure types from their members'
7019 linkage names. This must be done using the DIE's children rather
7020 than the children of any DW_AT_specification target. We only need
7021 to do this for structures at the top level, i.e. if the target of
7022 any DW_AT_specification (if any; otherwise the DIE itself) does not
7025 /* Compute the scope prefix associated with PDI's parent, in
7026 compilation unit CU. The result will be allocated on CU's
7027 comp_unit_obstack, or a copy of the already allocated PDI->NAME
7028 field. NULL is returned if no prefix is necessary. */
7030 partial_die_parent_scope (struct partial_die_info *pdi,
7031 struct dwarf2_cu *cu)
7033 const char *grandparent_scope;
7034 struct partial_die_info *parent, *real_pdi;
7036 /* We need to look at our parent DIE; if we have a DW_AT_specification,
7037 then this means the parent of the specification DIE. */
7040 while (real_pdi->has_specification)
7041 real_pdi = find_partial_die (real_pdi->spec_offset,
7042 real_pdi->spec_is_dwz, cu);
7044 parent = real_pdi->die_parent;
7048 if (parent->scope_set)
7049 return parent->scope;
7051 fixup_partial_die (parent, cu);
7053 grandparent_scope = partial_die_parent_scope (parent, cu);
7055 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
7056 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
7057 Work around this problem here. */
7058 if (cu->language == language_cplus
7059 && parent->tag == DW_TAG_namespace
7060 && strcmp (parent->name, "::") == 0
7061 && grandparent_scope == NULL)
7063 parent->scope = NULL;
7064 parent->scope_set = 1;
7068 if (pdi->tag == DW_TAG_enumerator)
7069 /* Enumerators should not get the name of the enumeration as a prefix. */
7070 parent->scope = grandparent_scope;
7071 else if (parent->tag == DW_TAG_namespace
7072 || parent->tag == DW_TAG_module
7073 || parent->tag == DW_TAG_structure_type
7074 || parent->tag == DW_TAG_class_type
7075 || parent->tag == DW_TAG_interface_type
7076 || parent->tag == DW_TAG_union_type
7077 || parent->tag == DW_TAG_enumeration_type)
7079 if (grandparent_scope == NULL)
7080 parent->scope = parent->name;
7082 parent->scope = typename_concat (&cu->comp_unit_obstack,
7084 parent->name, 0, cu);
7088 /* FIXME drow/2004-04-01: What should we be doing with
7089 function-local names? For partial symbols, we should probably be
7091 complaint (&symfile_complaints,
7092 _("unhandled containing DIE tag %d for DIE at %d"),
7093 parent->tag, to_underlying (pdi->sect_off));
7094 parent->scope = grandparent_scope;
7097 parent->scope_set = 1;
7098 return parent->scope;
7101 /* Return the fully scoped name associated with PDI, from compilation unit
7102 CU. The result will be allocated with malloc. */
7105 partial_die_full_name (struct partial_die_info *pdi,
7106 struct dwarf2_cu *cu)
7108 const char *parent_scope;
7110 /* If this is a template instantiation, we can not work out the
7111 template arguments from partial DIEs. So, unfortunately, we have
7112 to go through the full DIEs. At least any work we do building
7113 types here will be reused if full symbols are loaded later. */
7114 if (pdi->has_template_arguments)
7116 fixup_partial_die (pdi, cu);
7118 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
7120 struct die_info *die;
7121 struct attribute attr;
7122 struct dwarf2_cu *ref_cu = cu;
7124 /* DW_FORM_ref_addr is using section offset. */
7125 attr.name = (enum dwarf_attribute) 0;
7126 attr.form = DW_FORM_ref_addr;
7127 attr.u.unsnd = to_underlying (pdi->sect_off);
7128 die = follow_die_ref (NULL, &attr, &ref_cu);
7130 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
7134 parent_scope = partial_die_parent_scope (pdi, cu);
7135 if (parent_scope == NULL)
7138 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
7142 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
7144 struct objfile *objfile = cu->objfile;
7145 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7147 const char *actual_name = NULL;
7149 char *built_actual_name;
7151 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7153 built_actual_name = partial_die_full_name (pdi, cu);
7154 if (built_actual_name != NULL)
7155 actual_name = built_actual_name;
7157 if (actual_name == NULL)
7158 actual_name = pdi->name;
7162 case DW_TAG_subprogram:
7163 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
7164 if (pdi->is_external || cu->language == language_ada)
7166 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
7167 of the global scope. But in Ada, we want to be able to access
7168 nested procedures globally. So all Ada subprograms are stored
7169 in the global scope. */
7170 add_psymbol_to_list (actual_name, strlen (actual_name),
7171 built_actual_name != NULL,
7172 VAR_DOMAIN, LOC_BLOCK,
7173 &objfile->global_psymbols,
7174 addr, cu->language, objfile);
7178 add_psymbol_to_list (actual_name, strlen (actual_name),
7179 built_actual_name != NULL,
7180 VAR_DOMAIN, LOC_BLOCK,
7181 &objfile->static_psymbols,
7182 addr, cu->language, objfile);
7185 if (pdi->main_subprogram && actual_name != NULL)
7186 set_objfile_main_name (objfile, actual_name, cu->language);
7188 case DW_TAG_constant:
7190 struct psymbol_allocation_list *list;
7192 if (pdi->is_external)
7193 list = &objfile->global_psymbols;
7195 list = &objfile->static_psymbols;
7196 add_psymbol_to_list (actual_name, strlen (actual_name),
7197 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
7198 list, 0, cu->language, objfile);
7201 case DW_TAG_variable:
7203 addr = decode_locdesc (pdi->d.locdesc, cu);
7207 && !dwarf2_per_objfile->has_section_at_zero)
7209 /* A global or static variable may also have been stripped
7210 out by the linker if unused, in which case its address
7211 will be nullified; do not add such variables into partial
7212 symbol table then. */
7214 else if (pdi->is_external)
7217 Don't enter into the minimal symbol tables as there is
7218 a minimal symbol table entry from the ELF symbols already.
7219 Enter into partial symbol table if it has a location
7220 descriptor or a type.
7221 If the location descriptor is missing, new_symbol will create
7222 a LOC_UNRESOLVED symbol, the address of the variable will then
7223 be determined from the minimal symbol table whenever the variable
7225 The address for the partial symbol table entry is not
7226 used by GDB, but it comes in handy for debugging partial symbol
7229 if (pdi->d.locdesc || pdi->has_type)
7230 add_psymbol_to_list (actual_name, strlen (actual_name),
7231 built_actual_name != NULL,
7232 VAR_DOMAIN, LOC_STATIC,
7233 &objfile->global_psymbols,
7235 cu->language, objfile);
7239 int has_loc = pdi->d.locdesc != NULL;
7241 /* Static Variable. Skip symbols whose value we cannot know (those
7242 without location descriptors or constant values). */
7243 if (!has_loc && !pdi->has_const_value)
7245 xfree (built_actual_name);
7249 add_psymbol_to_list (actual_name, strlen (actual_name),
7250 built_actual_name != NULL,
7251 VAR_DOMAIN, LOC_STATIC,
7252 &objfile->static_psymbols,
7253 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
7254 cu->language, objfile);
7257 case DW_TAG_typedef:
7258 case DW_TAG_base_type:
7259 case DW_TAG_subrange_type:
7260 add_psymbol_to_list (actual_name, strlen (actual_name),
7261 built_actual_name != NULL,
7262 VAR_DOMAIN, LOC_TYPEDEF,
7263 &objfile->static_psymbols,
7264 0, cu->language, objfile);
7266 case DW_TAG_imported_declaration:
7267 case DW_TAG_namespace:
7268 add_psymbol_to_list (actual_name, strlen (actual_name),
7269 built_actual_name != NULL,
7270 VAR_DOMAIN, LOC_TYPEDEF,
7271 &objfile->global_psymbols,
7272 0, cu->language, objfile);
7275 add_psymbol_to_list (actual_name, strlen (actual_name),
7276 built_actual_name != NULL,
7277 MODULE_DOMAIN, LOC_TYPEDEF,
7278 &objfile->global_psymbols,
7279 0, cu->language, objfile);
7281 case DW_TAG_class_type:
7282 case DW_TAG_interface_type:
7283 case DW_TAG_structure_type:
7284 case DW_TAG_union_type:
7285 case DW_TAG_enumeration_type:
7286 /* Skip external references. The DWARF standard says in the section
7287 about "Structure, Union, and Class Type Entries": "An incomplete
7288 structure, union or class type is represented by a structure,
7289 union or class entry that does not have a byte size attribute
7290 and that has a DW_AT_declaration attribute." */
7291 if (!pdi->has_byte_size && pdi->is_declaration)
7293 xfree (built_actual_name);
7297 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
7298 static vs. global. */
7299 add_psymbol_to_list (actual_name, strlen (actual_name),
7300 built_actual_name != NULL,
7301 STRUCT_DOMAIN, LOC_TYPEDEF,
7302 cu->language == language_cplus
7303 ? &objfile->global_psymbols
7304 : &objfile->static_psymbols,
7305 0, cu->language, objfile);
7308 case DW_TAG_enumerator:
7309 add_psymbol_to_list (actual_name, strlen (actual_name),
7310 built_actual_name != NULL,
7311 VAR_DOMAIN, LOC_CONST,
7312 cu->language == language_cplus
7313 ? &objfile->global_psymbols
7314 : &objfile->static_psymbols,
7315 0, cu->language, objfile);
7321 xfree (built_actual_name);
7324 /* Read a partial die corresponding to a namespace; also, add a symbol
7325 corresponding to that namespace to the symbol table. NAMESPACE is
7326 the name of the enclosing namespace. */
7329 add_partial_namespace (struct partial_die_info *pdi,
7330 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7331 int set_addrmap, struct dwarf2_cu *cu)
7333 /* Add a symbol for the namespace. */
7335 add_partial_symbol (pdi, cu);
7337 /* Now scan partial symbols in that namespace. */
7339 if (pdi->has_children)
7340 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7343 /* Read a partial die corresponding to a Fortran module. */
7346 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
7347 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
7349 /* Add a symbol for the namespace. */
7351 add_partial_symbol (pdi, cu);
7353 /* Now scan partial symbols in that module. */
7355 if (pdi->has_children)
7356 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7359 /* Read a partial die corresponding to a subprogram and create a partial
7360 symbol for that subprogram. When the CU language allows it, this
7361 routine also defines a partial symbol for each nested subprogram
7362 that this subprogram contains. If SET_ADDRMAP is true, record the
7363 covered ranges in the addrmap. Set *LOWPC and *HIGHPC to the lowest
7364 and highest PC values found in PDI.
7366 PDI may also be a lexical block, in which case we simply search
7367 recursively for subprograms defined inside that lexical block.
7368 Again, this is only performed when the CU language allows this
7369 type of definitions. */
7372 add_partial_subprogram (struct partial_die_info *pdi,
7373 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7374 int set_addrmap, struct dwarf2_cu *cu)
7376 if (pdi->tag == DW_TAG_subprogram)
7378 if (pdi->has_pc_info)
7380 if (pdi->lowpc < *lowpc)
7381 *lowpc = pdi->lowpc;
7382 if (pdi->highpc > *highpc)
7383 *highpc = pdi->highpc;
7386 struct objfile *objfile = cu->objfile;
7387 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7392 baseaddr = ANOFFSET (objfile->section_offsets,
7393 SECT_OFF_TEXT (objfile));
7394 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7395 pdi->lowpc + baseaddr);
7396 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7397 pdi->highpc + baseaddr);
7398 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
7399 cu->per_cu->v.psymtab);
7403 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
7405 if (!pdi->is_declaration)
7406 /* Ignore subprogram DIEs that do not have a name, they are
7407 illegal. Do not emit a complaint at this point, we will
7408 do so when we convert this psymtab into a symtab. */
7410 add_partial_symbol (pdi, cu);
7414 if (! pdi->has_children)
7417 if (cu->language == language_ada)
7419 pdi = pdi->die_child;
7422 fixup_partial_die (pdi, cu);
7423 if (pdi->tag == DW_TAG_subprogram
7424 || pdi->tag == DW_TAG_lexical_block)
7425 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
7426 pdi = pdi->die_sibling;
7431 /* Read a partial die corresponding to an enumeration type. */
7434 add_partial_enumeration (struct partial_die_info *enum_pdi,
7435 struct dwarf2_cu *cu)
7437 struct partial_die_info *pdi;
7439 if (enum_pdi->name != NULL)
7440 add_partial_symbol (enum_pdi, cu);
7442 pdi = enum_pdi->die_child;
7445 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
7446 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
7448 add_partial_symbol (pdi, cu);
7449 pdi = pdi->die_sibling;
7453 /* Return the initial uleb128 in the die at INFO_PTR. */
7456 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
7458 unsigned int bytes_read;
7460 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7463 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
7464 Return the corresponding abbrev, or NULL if the number is zero (indicating
7465 an empty DIE). In either case *BYTES_READ will be set to the length of
7466 the initial number. */
7468 static struct abbrev_info *
7469 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
7470 struct dwarf2_cu *cu)
7472 bfd *abfd = cu->objfile->obfd;
7473 unsigned int abbrev_number;
7474 struct abbrev_info *abbrev;
7476 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
7478 if (abbrev_number == 0)
7481 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
7484 error (_("Dwarf Error: Could not find abbrev number %d in %s"
7485 " at offset 0x%x [in module %s]"),
7486 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
7487 to_underlying (cu->header.sect_off), bfd_get_filename (abfd));
7493 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7494 Returns a pointer to the end of a series of DIEs, terminated by an empty
7495 DIE. Any children of the skipped DIEs will also be skipped. */
7497 static const gdb_byte *
7498 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
7500 struct dwarf2_cu *cu = reader->cu;
7501 struct abbrev_info *abbrev;
7502 unsigned int bytes_read;
7506 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
7508 return info_ptr + bytes_read;
7510 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
7514 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
7515 INFO_PTR should point just after the initial uleb128 of a DIE, and the
7516 abbrev corresponding to that skipped uleb128 should be passed in
7517 ABBREV. Returns a pointer to this DIE's sibling, skipping any
7520 static const gdb_byte *
7521 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
7522 struct abbrev_info *abbrev)
7524 unsigned int bytes_read;
7525 struct attribute attr;
7526 bfd *abfd = reader->abfd;
7527 struct dwarf2_cu *cu = reader->cu;
7528 const gdb_byte *buffer = reader->buffer;
7529 const gdb_byte *buffer_end = reader->buffer_end;
7530 unsigned int form, i;
7532 for (i = 0; i < abbrev->num_attrs; i++)
7534 /* The only abbrev we care about is DW_AT_sibling. */
7535 if (abbrev->attrs[i].name == DW_AT_sibling)
7537 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
7538 if (attr.form == DW_FORM_ref_addr)
7539 complaint (&symfile_complaints,
7540 _("ignoring absolute DW_AT_sibling"));
7543 sect_offset off = dwarf2_get_ref_die_offset (&attr);
7544 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
7546 if (sibling_ptr < info_ptr)
7547 complaint (&symfile_complaints,
7548 _("DW_AT_sibling points backwards"));
7549 else if (sibling_ptr > reader->buffer_end)
7550 dwarf2_section_buffer_overflow_complaint (reader->die_section);
7556 /* If it isn't DW_AT_sibling, skip this attribute. */
7557 form = abbrev->attrs[i].form;
7561 case DW_FORM_ref_addr:
7562 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
7563 and later it is offset sized. */
7564 if (cu->header.version == 2)
7565 info_ptr += cu->header.addr_size;
7567 info_ptr += cu->header.offset_size;
7569 case DW_FORM_GNU_ref_alt:
7570 info_ptr += cu->header.offset_size;
7573 info_ptr += cu->header.addr_size;
7580 case DW_FORM_flag_present:
7581 case DW_FORM_implicit_const:
7593 case DW_FORM_ref_sig8:
7596 case DW_FORM_data16:
7599 case DW_FORM_string:
7600 read_direct_string (abfd, info_ptr, &bytes_read);
7601 info_ptr += bytes_read;
7603 case DW_FORM_sec_offset:
7605 case DW_FORM_GNU_strp_alt:
7606 info_ptr += cu->header.offset_size;
7608 case DW_FORM_exprloc:
7610 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7611 info_ptr += bytes_read;
7613 case DW_FORM_block1:
7614 info_ptr += 1 + read_1_byte (abfd, info_ptr);
7616 case DW_FORM_block2:
7617 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
7619 case DW_FORM_block4:
7620 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
7624 case DW_FORM_ref_udata:
7625 case DW_FORM_GNU_addr_index:
7626 case DW_FORM_GNU_str_index:
7627 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
7629 case DW_FORM_indirect:
7630 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
7631 info_ptr += bytes_read;
7632 /* We need to continue parsing from here, so just go back to
7634 goto skip_attribute;
7637 error (_("Dwarf Error: Cannot handle %s "
7638 "in DWARF reader [in module %s]"),
7639 dwarf_form_name (form),
7640 bfd_get_filename (abfd));
7644 if (abbrev->has_children)
7645 return skip_children (reader, info_ptr);
7650 /* Locate ORIG_PDI's sibling.
7651 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
7653 static const gdb_byte *
7654 locate_pdi_sibling (const struct die_reader_specs *reader,
7655 struct partial_die_info *orig_pdi,
7656 const gdb_byte *info_ptr)
7658 /* Do we know the sibling already? */
7660 if (orig_pdi->sibling)
7661 return orig_pdi->sibling;
7663 /* Are there any children to deal with? */
7665 if (!orig_pdi->has_children)
7668 /* Skip the children the long way. */
7670 return skip_children (reader, info_ptr);
7673 /* Expand this partial symbol table into a full symbol table. SELF is
7677 dwarf2_read_symtab (struct partial_symtab *self,
7678 struct objfile *objfile)
7682 warning (_("bug: psymtab for %s is already read in."),
7689 printf_filtered (_("Reading in symbols for %s..."),
7691 gdb_flush (gdb_stdout);
7694 /* Restore our global data. */
7696 = (struct dwarf2_per_objfile *) objfile_data (objfile,
7697 dwarf2_objfile_data_key);
7699 /* If this psymtab is constructed from a debug-only objfile, the
7700 has_section_at_zero flag will not necessarily be correct. We
7701 can get the correct value for this flag by looking at the data
7702 associated with the (presumably stripped) associated objfile. */
7703 if (objfile->separate_debug_objfile_backlink)
7705 struct dwarf2_per_objfile *dpo_backlink
7706 = ((struct dwarf2_per_objfile *)
7707 objfile_data (objfile->separate_debug_objfile_backlink,
7708 dwarf2_objfile_data_key));
7710 dwarf2_per_objfile->has_section_at_zero
7711 = dpo_backlink->has_section_at_zero;
7714 dwarf2_per_objfile->reading_partial_symbols = 0;
7716 psymtab_to_symtab_1 (self);
7718 /* Finish up the debug error message. */
7720 printf_filtered (_("done.\n"));
7723 process_cu_includes ();
7726 /* Reading in full CUs. */
7728 /* Add PER_CU to the queue. */
7731 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
7732 enum language pretend_language)
7734 struct dwarf2_queue_item *item;
7737 item = XNEW (struct dwarf2_queue_item);
7738 item->per_cu = per_cu;
7739 item->pretend_language = pretend_language;
7742 if (dwarf2_queue == NULL)
7743 dwarf2_queue = item;
7745 dwarf2_queue_tail->next = item;
7747 dwarf2_queue_tail = item;
7750 /* If PER_CU is not yet queued, add it to the queue.
7751 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
7753 The result is non-zero if PER_CU was queued, otherwise the result is zero
7754 meaning either PER_CU is already queued or it is already loaded.
7756 N.B. There is an invariant here that if a CU is queued then it is loaded.
7757 The caller is required to load PER_CU if we return non-zero. */
7760 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
7761 struct dwarf2_per_cu_data *per_cu,
7762 enum language pretend_language)
7764 /* We may arrive here during partial symbol reading, if we need full
7765 DIEs to process an unusual case (e.g. template arguments). Do
7766 not queue PER_CU, just tell our caller to load its DIEs. */
7767 if (dwarf2_per_objfile->reading_partial_symbols)
7769 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
7774 /* Mark the dependence relation so that we don't flush PER_CU
7776 if (dependent_cu != NULL)
7777 dwarf2_add_dependence (dependent_cu, per_cu);
7779 /* If it's already on the queue, we have nothing to do. */
7783 /* If the compilation unit is already loaded, just mark it as
7785 if (per_cu->cu != NULL)
7787 per_cu->cu->last_used = 0;
7791 /* Add it to the queue. */
7792 queue_comp_unit (per_cu, pretend_language);
7797 /* Process the queue. */
7800 process_queue (void)
7802 struct dwarf2_queue_item *item, *next_item;
7804 if (dwarf_read_debug)
7806 fprintf_unfiltered (gdb_stdlog,
7807 "Expanding one or more symtabs of objfile %s ...\n",
7808 objfile_name (dwarf2_per_objfile->objfile));
7811 /* The queue starts out with one item, but following a DIE reference
7812 may load a new CU, adding it to the end of the queue. */
7813 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
7815 if ((dwarf2_per_objfile->using_index
7816 ? !item->per_cu->v.quick->compunit_symtab
7817 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
7818 /* Skip dummy CUs. */
7819 && item->per_cu->cu != NULL)
7821 struct dwarf2_per_cu_data *per_cu = item->per_cu;
7822 unsigned int debug_print_threshold;
7825 if (per_cu->is_debug_types)
7827 struct signatured_type *sig_type =
7828 (struct signatured_type *) per_cu;
7830 sprintf (buf, "TU %s at offset 0x%x",
7831 hex_string (sig_type->signature),
7832 to_underlying (per_cu->sect_off));
7833 /* There can be 100s of TUs.
7834 Only print them in verbose mode. */
7835 debug_print_threshold = 2;
7839 sprintf (buf, "CU at offset 0x%x",
7840 to_underlying (per_cu->sect_off));
7841 debug_print_threshold = 1;
7844 if (dwarf_read_debug >= debug_print_threshold)
7845 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
7847 if (per_cu->is_debug_types)
7848 process_full_type_unit (per_cu, item->pretend_language);
7850 process_full_comp_unit (per_cu, item->pretend_language);
7852 if (dwarf_read_debug >= debug_print_threshold)
7853 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
7856 item->per_cu->queued = 0;
7857 next_item = item->next;
7861 dwarf2_queue_tail = NULL;
7863 if (dwarf_read_debug)
7865 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7866 objfile_name (dwarf2_per_objfile->objfile));
7870 /* Free all allocated queue entries. This function only releases anything if
7871 an error was thrown; if the queue was processed then it would have been
7872 freed as we went along. */
7875 dwarf2_release_queue (void *dummy)
7877 struct dwarf2_queue_item *item, *last;
7879 item = dwarf2_queue;
7882 /* Anything still marked queued is likely to be in an
7883 inconsistent state, so discard it. */
7884 if (item->per_cu->queued)
7886 if (item->per_cu->cu != NULL)
7887 free_one_cached_comp_unit (item->per_cu);
7888 item->per_cu->queued = 0;
7896 dwarf2_queue = dwarf2_queue_tail = NULL;
7899 /* Read in full symbols for PST, and anything it depends on. */
7902 psymtab_to_symtab_1 (struct partial_symtab *pst)
7904 struct dwarf2_per_cu_data *per_cu;
7910 for (i = 0; i < pst->number_of_dependencies; i++)
7911 if (!pst->dependencies[i]->readin
7912 && pst->dependencies[i]->user == NULL)
7914 /* Inform about additional files that need to be read in. */
7917 /* FIXME: i18n: Need to make this a single string. */
7918 fputs_filtered (" ", gdb_stdout);
7920 fputs_filtered ("and ", gdb_stdout);
7922 printf_filtered ("%s...", pst->dependencies[i]->filename);
7923 wrap_here (""); /* Flush output. */
7924 gdb_flush (gdb_stdout);
7926 psymtab_to_symtab_1 (pst->dependencies[i]);
7929 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
7933 /* It's an include file, no symbols to read for it.
7934 Everything is in the parent symtab. */
7939 dw2_do_instantiate_symtab (per_cu);
7942 /* Trivial hash function for die_info: the hash value of a DIE
7943 is its offset in .debug_info for this objfile. */
7946 die_hash (const void *item)
7948 const struct die_info *die = (const struct die_info *) item;
7950 return to_underlying (die->sect_off);
7953 /* Trivial comparison function for die_info structures: two DIEs
7954 are equal if they have the same offset. */
7957 die_eq (const void *item_lhs, const void *item_rhs)
7959 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
7960 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
7962 return die_lhs->sect_off == die_rhs->sect_off;
7965 /* die_reader_func for load_full_comp_unit.
7966 This is identical to read_signatured_type_reader,
7967 but is kept separate for now. */
7970 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7971 const gdb_byte *info_ptr,
7972 struct die_info *comp_unit_die,
7976 struct dwarf2_cu *cu = reader->cu;
7977 enum language *language_ptr = (enum language *) data;
7979 gdb_assert (cu->die_hash == NULL);
7981 htab_create_alloc_ex (cu->header.length / 12,
7985 &cu->comp_unit_obstack,
7986 hashtab_obstack_allocate,
7987 dummy_obstack_deallocate);
7990 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7991 &info_ptr, comp_unit_die);
7992 cu->dies = comp_unit_die;
7993 /* comp_unit_die is not stored in die_hash, no need. */
7995 /* We try not to read any attributes in this function, because not
7996 all CUs needed for references have been loaded yet, and symbol
7997 table processing isn't initialized. But we have to set the CU language,
7998 or we won't be able to build types correctly.
7999 Similarly, if we do not read the producer, we can not apply
8000 producer-specific interpretation. */
8001 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
8004 /* Load the DIEs associated with PER_CU into memory. */
8007 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
8008 enum language pretend_language)
8010 gdb_assert (! this_cu->is_debug_types);
8012 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
8013 load_full_comp_unit_reader, &pretend_language);
8016 /* Add a DIE to the delayed physname list. */
8019 add_to_method_list (struct type *type, int fnfield_index, int index,
8020 const char *name, struct die_info *die,
8021 struct dwarf2_cu *cu)
8023 struct delayed_method_info mi;
8025 mi.fnfield_index = fnfield_index;
8029 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
8032 /* A cleanup for freeing the delayed method list. */
8035 free_delayed_list (void *ptr)
8037 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
8038 if (cu->method_list != NULL)
8040 VEC_free (delayed_method_info, cu->method_list);
8041 cu->method_list = NULL;
8045 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
8046 "const" / "volatile". If so, decrements LEN by the length of the
8047 modifier and return true. Otherwise return false. */
8051 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
8053 size_t mod_len = sizeof (mod) - 1;
8054 if (len > mod_len && startswith (physname + (len - mod_len), mod))
8062 /* Compute the physnames of any methods on the CU's method list.
8064 The computation of method physnames is delayed in order to avoid the
8065 (bad) condition that one of the method's formal parameters is of an as yet
8069 compute_delayed_physnames (struct dwarf2_cu *cu)
8072 struct delayed_method_info *mi;
8074 /* Only C++ delays computing physnames. */
8075 if (VEC_empty (delayed_method_info, cu->method_list))
8077 gdb_assert (cu->language == language_cplus);
8079 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
8081 const char *physname;
8082 struct fn_fieldlist *fn_flp
8083 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
8084 physname = dwarf2_physname (mi->name, mi->die, cu);
8085 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi->index)
8086 = physname ? physname : "";
8088 /* Since there's no tag to indicate whether a method is a
8089 const/volatile overload, extract that information out of the
8091 if (physname != NULL)
8093 size_t len = strlen (physname);
8097 if (physname[len] == ')') /* shortcut */
8099 else if (check_modifier (physname, len, " const"))
8100 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi->index) = 1;
8101 else if (check_modifier (physname, len, " volatile"))
8102 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi->index) = 1;
8110 /* Go objects should be embedded in a DW_TAG_module DIE,
8111 and it's not clear if/how imported objects will appear.
8112 To keep Go support simple until that's worked out,
8113 go back through what we've read and create something usable.
8114 We could do this while processing each DIE, and feels kinda cleaner,
8115 but that way is more invasive.
8116 This is to, for example, allow the user to type "p var" or "b main"
8117 without having to specify the package name, and allow lookups
8118 of module.object to work in contexts that use the expression
8122 fixup_go_packaging (struct dwarf2_cu *cu)
8124 char *package_name = NULL;
8125 struct pending *list;
8128 for (list = global_symbols; list != NULL; list = list->next)
8130 for (i = 0; i < list->nsyms; ++i)
8132 struct symbol *sym = list->symbol[i];
8134 if (SYMBOL_LANGUAGE (sym) == language_go
8135 && SYMBOL_CLASS (sym) == LOC_BLOCK)
8137 char *this_package_name = go_symbol_package_name (sym);
8139 if (this_package_name == NULL)
8141 if (package_name == NULL)
8142 package_name = this_package_name;
8145 if (strcmp (package_name, this_package_name) != 0)
8146 complaint (&symfile_complaints,
8147 _("Symtab %s has objects from two different Go packages: %s and %s"),
8148 (symbol_symtab (sym) != NULL
8149 ? symtab_to_filename_for_display
8150 (symbol_symtab (sym))
8151 : objfile_name (cu->objfile)),
8152 this_package_name, package_name);
8153 xfree (this_package_name);
8159 if (package_name != NULL)
8161 struct objfile *objfile = cu->objfile;
8162 const char *saved_package_name
8163 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
8165 strlen (package_name));
8166 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
8167 saved_package_name);
8170 TYPE_TAG_NAME (type) = TYPE_NAME (type);
8172 sym = allocate_symbol (objfile);
8173 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
8174 SYMBOL_SET_NAMES (sym, saved_package_name,
8175 strlen (saved_package_name), 0, objfile);
8176 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
8177 e.g., "main" finds the "main" module and not C's main(). */
8178 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
8179 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
8180 SYMBOL_TYPE (sym) = type;
8182 add_symbol_to_list (sym, &global_symbols);
8184 xfree (package_name);
8188 /* Return the symtab for PER_CU. This works properly regardless of
8189 whether we're using the index or psymtabs. */
8191 static struct compunit_symtab *
8192 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
8194 return (dwarf2_per_objfile->using_index
8195 ? per_cu->v.quick->compunit_symtab
8196 : per_cu->v.psymtab->compunit_symtab);
8199 /* A helper function for computing the list of all symbol tables
8200 included by PER_CU. */
8203 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
8204 htab_t all_children, htab_t all_type_symtabs,
8205 struct dwarf2_per_cu_data *per_cu,
8206 struct compunit_symtab *immediate_parent)
8210 struct compunit_symtab *cust;
8211 struct dwarf2_per_cu_data *iter;
8213 slot = htab_find_slot (all_children, per_cu, INSERT);
8216 /* This inclusion and its children have been processed. */
8221 /* Only add a CU if it has a symbol table. */
8222 cust = get_compunit_symtab (per_cu);
8225 /* If this is a type unit only add its symbol table if we haven't
8226 seen it yet (type unit per_cu's can share symtabs). */
8227 if (per_cu->is_debug_types)
8229 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
8233 VEC_safe_push (compunit_symtab_ptr, *result, cust);
8234 if (cust->user == NULL)
8235 cust->user = immediate_parent;
8240 VEC_safe_push (compunit_symtab_ptr, *result, cust);
8241 if (cust->user == NULL)
8242 cust->user = immediate_parent;
8247 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
8250 recursively_compute_inclusions (result, all_children,
8251 all_type_symtabs, iter, cust);
8255 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
8259 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
8261 gdb_assert (! per_cu->is_debug_types);
8263 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
8266 struct dwarf2_per_cu_data *per_cu_iter;
8267 struct compunit_symtab *compunit_symtab_iter;
8268 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
8269 htab_t all_children, all_type_symtabs;
8270 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
8272 /* If we don't have a symtab, we can just skip this case. */
8276 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
8277 NULL, xcalloc, xfree);
8278 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
8279 NULL, xcalloc, xfree);
8282 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
8286 recursively_compute_inclusions (&result_symtabs, all_children,
8287 all_type_symtabs, per_cu_iter,
8291 /* Now we have a transitive closure of all the included symtabs. */
8292 len = VEC_length (compunit_symtab_ptr, result_symtabs);
8294 = XOBNEWVEC (&dwarf2_per_objfile->objfile->objfile_obstack,
8295 struct compunit_symtab *, len + 1);
8297 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
8298 compunit_symtab_iter);
8300 cust->includes[ix] = compunit_symtab_iter;
8301 cust->includes[len] = NULL;
8303 VEC_free (compunit_symtab_ptr, result_symtabs);
8304 htab_delete (all_children);
8305 htab_delete (all_type_symtabs);
8309 /* Compute the 'includes' field for the symtabs of all the CUs we just
8313 process_cu_includes (void)
8316 struct dwarf2_per_cu_data *iter;
8319 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
8323 if (! iter->is_debug_types)
8324 compute_compunit_symtab_includes (iter);
8327 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
8330 /* Generate full symbol information for PER_CU, whose DIEs have
8331 already been loaded into memory. */
8334 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
8335 enum language pretend_language)
8337 struct dwarf2_cu *cu = per_cu->cu;
8338 struct objfile *objfile = per_cu->objfile;
8339 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8340 CORE_ADDR lowpc, highpc;
8341 struct compunit_symtab *cust;
8342 struct cleanup *back_to, *delayed_list_cleanup;
8344 struct block *static_block;
8347 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8350 back_to = make_cleanup (really_free_pendings, NULL);
8351 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
8353 cu->list_in_scope = &file_symbols;
8355 cu->language = pretend_language;
8356 cu->language_defn = language_def (cu->language);
8358 /* Do line number decoding in read_file_scope () */
8359 process_die (cu->dies, cu);
8361 /* For now fudge the Go package. */
8362 if (cu->language == language_go)
8363 fixup_go_packaging (cu);
8365 /* Now that we have processed all the DIEs in the CU, all the types
8366 should be complete, and it should now be safe to compute all of the
8368 compute_delayed_physnames (cu);
8369 do_cleanups (delayed_list_cleanup);
8371 /* Some compilers don't define a DW_AT_high_pc attribute for the
8372 compilation unit. If the DW_AT_high_pc is missing, synthesize
8373 it, by scanning the DIE's below the compilation unit. */
8374 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
8376 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
8377 static_block = end_symtab_get_static_block (addr, 0, 1);
8379 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
8380 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
8381 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
8382 addrmap to help ensure it has an accurate map of pc values belonging to
8384 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
8386 cust = end_symtab_from_static_block (static_block,
8387 SECT_OFF_TEXT (objfile), 0);
8391 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
8393 /* Set symtab language to language from DW_AT_language. If the
8394 compilation is from a C file generated by language preprocessors, do
8395 not set the language if it was already deduced by start_subfile. */
8396 if (!(cu->language == language_c
8397 && COMPUNIT_FILETABS (cust)->language != language_unknown))
8398 COMPUNIT_FILETABS (cust)->language = cu->language;
8400 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
8401 produce DW_AT_location with location lists but it can be possibly
8402 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
8403 there were bugs in prologue debug info, fixed later in GCC-4.5
8404 by "unwind info for epilogues" patch (which is not directly related).
8406 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
8407 needed, it would be wrong due to missing DW_AT_producer there.
8409 Still one can confuse GDB by using non-standard GCC compilation
8410 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
8412 if (cu->has_loclist && gcc_4_minor >= 5)
8413 cust->locations_valid = 1;
8415 if (gcc_4_minor >= 5)
8416 cust->epilogue_unwind_valid = 1;
8418 cust->call_site_htab = cu->call_site_htab;
8421 if (dwarf2_per_objfile->using_index)
8422 per_cu->v.quick->compunit_symtab = cust;
8425 struct partial_symtab *pst = per_cu->v.psymtab;
8426 pst->compunit_symtab = cust;
8430 /* Push it for inclusion processing later. */
8431 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
8433 do_cleanups (back_to);
8436 /* Generate full symbol information for type unit PER_CU, whose DIEs have
8437 already been loaded into memory. */
8440 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
8441 enum language pretend_language)
8443 struct dwarf2_cu *cu = per_cu->cu;
8444 struct objfile *objfile = per_cu->objfile;
8445 struct compunit_symtab *cust;
8446 struct cleanup *back_to, *delayed_list_cleanup;
8447 struct signatured_type *sig_type;
8449 gdb_assert (per_cu->is_debug_types);
8450 sig_type = (struct signatured_type *) per_cu;
8453 back_to = make_cleanup (really_free_pendings, NULL);
8454 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
8456 cu->list_in_scope = &file_symbols;
8458 cu->language = pretend_language;
8459 cu->language_defn = language_def (cu->language);
8461 /* The symbol tables are set up in read_type_unit_scope. */
8462 process_die (cu->dies, cu);
8464 /* For now fudge the Go package. */
8465 if (cu->language == language_go)
8466 fixup_go_packaging (cu);
8468 /* Now that we have processed all the DIEs in the CU, all the types
8469 should be complete, and it should now be safe to compute all of the
8471 compute_delayed_physnames (cu);
8472 do_cleanups (delayed_list_cleanup);
8474 /* TUs share symbol tables.
8475 If this is the first TU to use this symtab, complete the construction
8476 of it with end_expandable_symtab. Otherwise, complete the addition of
8477 this TU's symbols to the existing symtab. */
8478 if (sig_type->type_unit_group->compunit_symtab == NULL)
8480 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
8481 sig_type->type_unit_group->compunit_symtab = cust;
8485 /* Set symtab language to language from DW_AT_language. If the
8486 compilation is from a C file generated by language preprocessors,
8487 do not set the language if it was already deduced by
8489 if (!(cu->language == language_c
8490 && COMPUNIT_FILETABS (cust)->language != language_c))
8491 COMPUNIT_FILETABS (cust)->language = cu->language;
8496 augment_type_symtab ();
8497 cust = sig_type->type_unit_group->compunit_symtab;
8500 if (dwarf2_per_objfile->using_index)
8501 per_cu->v.quick->compunit_symtab = cust;
8504 struct partial_symtab *pst = per_cu->v.psymtab;
8505 pst->compunit_symtab = cust;
8509 do_cleanups (back_to);
8512 /* Process an imported unit DIE. */
8515 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
8517 struct attribute *attr;
8519 /* For now we don't handle imported units in type units. */
8520 if (cu->per_cu->is_debug_types)
8522 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8523 " supported in type units [in module %s]"),
8524 objfile_name (cu->objfile));
8527 attr = dwarf2_attr (die, DW_AT_import, cu);
8530 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
8531 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
8532 dwarf2_per_cu_data *per_cu
8533 = dwarf2_find_containing_comp_unit (sect_off, is_dwz, cu->objfile);
8535 /* If necessary, add it to the queue and load its DIEs. */
8536 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
8537 load_full_comp_unit (per_cu, cu->language);
8539 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8544 /* RAII object that represents a process_die scope: i.e.,
8545 starts/finishes processing a DIE. */
8546 class process_die_scope
8549 process_die_scope (die_info *die, dwarf2_cu *cu)
8550 : m_die (die), m_cu (cu)
8552 /* We should only be processing DIEs not already in process. */
8553 gdb_assert (!m_die->in_process);
8554 m_die->in_process = true;
8557 ~process_die_scope ()
8559 m_die->in_process = false;
8561 /* If we're done processing the DIE for the CU that owns the line
8562 header, we don't need the line header anymore. */
8563 if (m_cu->line_header_die_owner == m_die)
8565 delete m_cu->line_header;
8566 m_cu->line_header = NULL;
8567 m_cu->line_header_die_owner = NULL;
8576 /* Process a die and its children. */
8579 process_die (struct die_info *die, struct dwarf2_cu *cu)
8581 process_die_scope scope (die, cu);
8585 case DW_TAG_padding:
8587 case DW_TAG_compile_unit:
8588 case DW_TAG_partial_unit:
8589 read_file_scope (die, cu);
8591 case DW_TAG_type_unit:
8592 read_type_unit_scope (die, cu);
8594 case DW_TAG_subprogram:
8595 case DW_TAG_inlined_subroutine:
8596 read_func_scope (die, cu);
8598 case DW_TAG_lexical_block:
8599 case DW_TAG_try_block:
8600 case DW_TAG_catch_block:
8601 read_lexical_block_scope (die, cu);
8603 case DW_TAG_call_site:
8604 case DW_TAG_GNU_call_site:
8605 read_call_site_scope (die, cu);
8607 case DW_TAG_class_type:
8608 case DW_TAG_interface_type:
8609 case DW_TAG_structure_type:
8610 case DW_TAG_union_type:
8611 process_structure_scope (die, cu);
8613 case DW_TAG_enumeration_type:
8614 process_enumeration_scope (die, cu);
8617 /* These dies have a type, but processing them does not create
8618 a symbol or recurse to process the children. Therefore we can
8619 read them on-demand through read_type_die. */
8620 case DW_TAG_subroutine_type:
8621 case DW_TAG_set_type:
8622 case DW_TAG_array_type:
8623 case DW_TAG_pointer_type:
8624 case DW_TAG_ptr_to_member_type:
8625 case DW_TAG_reference_type:
8626 case DW_TAG_rvalue_reference_type:
8627 case DW_TAG_string_type:
8630 case DW_TAG_base_type:
8631 case DW_TAG_subrange_type:
8632 case DW_TAG_typedef:
8633 /* Add a typedef symbol for the type definition, if it has a
8635 new_symbol (die, read_type_die (die, cu), cu);
8637 case DW_TAG_common_block:
8638 read_common_block (die, cu);
8640 case DW_TAG_common_inclusion:
8642 case DW_TAG_namespace:
8643 cu->processing_has_namespace_info = 1;
8644 read_namespace (die, cu);
8647 cu->processing_has_namespace_info = 1;
8648 read_module (die, cu);
8650 case DW_TAG_imported_declaration:
8651 cu->processing_has_namespace_info = 1;
8652 if (read_namespace_alias (die, cu))
8654 /* The declaration is not a global namespace alias: fall through. */
8655 case DW_TAG_imported_module:
8656 cu->processing_has_namespace_info = 1;
8657 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
8658 || cu->language != language_fortran))
8659 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
8660 dwarf_tag_name (die->tag));
8661 read_import_statement (die, cu);
8664 case DW_TAG_imported_unit:
8665 process_imported_unit_die (die, cu);
8669 new_symbol (die, NULL, cu);
8674 /* DWARF name computation. */
8676 /* A helper function for dwarf2_compute_name which determines whether DIE
8677 needs to have the name of the scope prepended to the name listed in the
8681 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
8683 struct attribute *attr;
8687 case DW_TAG_namespace:
8688 case DW_TAG_typedef:
8689 case DW_TAG_class_type:
8690 case DW_TAG_interface_type:
8691 case DW_TAG_structure_type:
8692 case DW_TAG_union_type:
8693 case DW_TAG_enumeration_type:
8694 case DW_TAG_enumerator:
8695 case DW_TAG_subprogram:
8696 case DW_TAG_inlined_subroutine:
8698 case DW_TAG_imported_declaration:
8701 case DW_TAG_variable:
8702 case DW_TAG_constant:
8703 /* We only need to prefix "globally" visible variables. These include
8704 any variable marked with DW_AT_external or any variable that
8705 lives in a namespace. [Variables in anonymous namespaces
8706 require prefixing, but they are not DW_AT_external.] */
8708 if (dwarf2_attr (die, DW_AT_specification, cu))
8710 struct dwarf2_cu *spec_cu = cu;
8712 return die_needs_namespace (die_specification (die, &spec_cu),
8716 attr = dwarf2_attr (die, DW_AT_external, cu);
8717 if (attr == NULL && die->parent->tag != DW_TAG_namespace
8718 && die->parent->tag != DW_TAG_module)
8720 /* A variable in a lexical block of some kind does not need a
8721 namespace, even though in C++ such variables may be external
8722 and have a mangled name. */
8723 if (die->parent->tag == DW_TAG_lexical_block
8724 || die->parent->tag == DW_TAG_try_block
8725 || die->parent->tag == DW_TAG_catch_block
8726 || die->parent->tag == DW_TAG_subprogram)
8735 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
8736 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
8737 defined for the given DIE. */
8739 static struct attribute *
8740 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
8742 struct attribute *attr;
8744 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
8746 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
8751 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
8752 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
8753 defined for the given DIE. */
8756 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
8758 const char *linkage_name;
8760 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
8761 if (linkage_name == NULL)
8762 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
8764 return linkage_name;
8767 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
8768 compute the physname for the object, which include a method's:
8769 - formal parameters (C++),
8770 - receiver type (Go),
8772 The term "physname" is a bit confusing.
8773 For C++, for example, it is the demangled name.
8774 For Go, for example, it's the mangled name.
8776 For Ada, return the DIE's linkage name rather than the fully qualified
8777 name. PHYSNAME is ignored..
8779 The result is allocated on the objfile_obstack and canonicalized. */
8782 dwarf2_compute_name (const char *name,
8783 struct die_info *die, struct dwarf2_cu *cu,
8786 struct objfile *objfile = cu->objfile;
8789 name = dwarf2_name (die, cu);
8791 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
8792 but otherwise compute it by typename_concat inside GDB.
8793 FIXME: Actually this is not really true, or at least not always true.
8794 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
8795 Fortran names because there is no mangling standard. So new_symbol_full
8796 will set the demangled name to the result of dwarf2_full_name, and it is
8797 the demangled name that GDB uses if it exists. */
8798 if (cu->language == language_ada
8799 || (cu->language == language_fortran && physname))
8801 /* For Ada unit, we prefer the linkage name over the name, as
8802 the former contains the exported name, which the user expects
8803 to be able to reference. Ideally, we want the user to be able
8804 to reference this entity using either natural or linkage name,
8805 but we haven't started looking at this enhancement yet. */
8806 const char *linkage_name = dw2_linkage_name (die, cu);
8808 if (linkage_name != NULL)
8809 return linkage_name;
8812 /* These are the only languages we know how to qualify names in. */
8814 && (cu->language == language_cplus
8815 || cu->language == language_fortran || cu->language == language_d
8816 || cu->language == language_rust))
8818 if (die_needs_namespace (die, cu))
8822 const char *canonical_name = NULL;
8826 prefix = determine_prefix (die, cu);
8827 if (*prefix != '\0')
8829 char *prefixed_name = typename_concat (NULL, prefix, name,
8832 buf.puts (prefixed_name);
8833 xfree (prefixed_name);
8838 /* Template parameters may be specified in the DIE's DW_AT_name, or
8839 as children with DW_TAG_template_type_param or
8840 DW_TAG_value_type_param. If the latter, add them to the name
8841 here. If the name already has template parameters, then
8842 skip this step; some versions of GCC emit both, and
8843 it is more efficient to use the pre-computed name.
8845 Something to keep in mind about this process: it is very
8846 unlikely, or in some cases downright impossible, to produce
8847 something that will match the mangled name of a function.
8848 If the definition of the function has the same debug info,
8849 we should be able to match up with it anyway. But fallbacks
8850 using the minimal symbol, for instance to find a method
8851 implemented in a stripped copy of libstdc++, will not work.
8852 If we do not have debug info for the definition, we will have to
8853 match them up some other way.
8855 When we do name matching there is a related problem with function
8856 templates; two instantiated function templates are allowed to
8857 differ only by their return types, which we do not add here. */
8859 if (cu->language == language_cplus && strchr (name, '<') == NULL)
8861 struct attribute *attr;
8862 struct die_info *child;
8865 die->building_fullname = 1;
8867 for (child = die->child; child != NULL; child = child->sibling)
8871 const gdb_byte *bytes;
8872 struct dwarf2_locexpr_baton *baton;
8875 if (child->tag != DW_TAG_template_type_param
8876 && child->tag != DW_TAG_template_value_param)
8887 attr = dwarf2_attr (child, DW_AT_type, cu);
8890 complaint (&symfile_complaints,
8891 _("template parameter missing DW_AT_type"));
8892 buf.puts ("UNKNOWN_TYPE");
8895 type = die_type (child, cu);
8897 if (child->tag == DW_TAG_template_type_param)
8899 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
8903 attr = dwarf2_attr (child, DW_AT_const_value, cu);
8906 complaint (&symfile_complaints,
8907 _("template parameter missing "
8908 "DW_AT_const_value"));
8909 buf.puts ("UNKNOWN_VALUE");
8913 dwarf2_const_value_attr (attr, type, name,
8914 &cu->comp_unit_obstack, cu,
8915 &value, &bytes, &baton);
8917 if (TYPE_NOSIGN (type))
8918 /* GDB prints characters as NUMBER 'CHAR'. If that's
8919 changed, this can use value_print instead. */
8920 c_printchar (value, type, &buf);
8923 struct value_print_options opts;
8926 v = dwarf2_evaluate_loc_desc (type, NULL,
8930 else if (bytes != NULL)
8932 v = allocate_value (type);
8933 memcpy (value_contents_writeable (v), bytes,
8934 TYPE_LENGTH (type));
8937 v = value_from_longest (type, value);
8939 /* Specify decimal so that we do not depend on
8941 get_formatted_print_options (&opts, 'd');
8943 value_print (v, &buf, &opts);
8949 die->building_fullname = 0;
8953 /* Close the argument list, with a space if necessary
8954 (nested templates). */
8955 if (!buf.empty () && buf.string ().back () == '>')
8962 /* For C++ methods, append formal parameter type
8963 information, if PHYSNAME. */
8965 if (physname && die->tag == DW_TAG_subprogram
8966 && cu->language == language_cplus)
8968 struct type *type = read_type_die (die, cu);
8970 c_type_print_args (type, &buf, 1, cu->language,
8971 &type_print_raw_options);
8973 if (cu->language == language_cplus)
8975 /* Assume that an artificial first parameter is
8976 "this", but do not crash if it is not. RealView
8977 marks unnamed (and thus unused) parameters as
8978 artificial; there is no way to differentiate
8980 if (TYPE_NFIELDS (type) > 0
8981 && TYPE_FIELD_ARTIFICIAL (type, 0)
8982 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8983 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8985 buf.puts (" const");
8989 const std::string &intermediate_name = buf.string ();
8991 if (cu->language == language_cplus)
8993 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
8994 &objfile->per_bfd->storage_obstack);
8996 /* If we only computed INTERMEDIATE_NAME, or if
8997 INTERMEDIATE_NAME is already canonical, then we need to
8998 copy it to the appropriate obstack. */
8999 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
9000 name = ((const char *)
9001 obstack_copy0 (&objfile->per_bfd->storage_obstack,
9002 intermediate_name.c_str (),
9003 intermediate_name.length ()));
9005 name = canonical_name;
9012 /* Return the fully qualified name of DIE, based on its DW_AT_name.
9013 If scope qualifiers are appropriate they will be added. The result
9014 will be allocated on the storage_obstack, or NULL if the DIE does
9015 not have a name. NAME may either be from a previous call to
9016 dwarf2_name or NULL.
9018 The output string will be canonicalized (if C++). */
9021 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
9023 return dwarf2_compute_name (name, die, cu, 0);
9026 /* Construct a physname for the given DIE in CU. NAME may either be
9027 from a previous call to dwarf2_name or NULL. The result will be
9028 allocated on the objfile_objstack or NULL if the DIE does not have a
9031 The output string will be canonicalized (if C++). */
9034 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
9036 struct objfile *objfile = cu->objfile;
9037 const char *retval, *mangled = NULL, *canon = NULL;
9038 struct cleanup *back_to;
9041 /* In this case dwarf2_compute_name is just a shortcut not building anything
9043 if (!die_needs_namespace (die, cu))
9044 return dwarf2_compute_name (name, die, cu, 1);
9046 back_to = make_cleanup (null_cleanup, NULL);
9048 mangled = dw2_linkage_name (die, cu);
9050 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
9051 See https://github.com/rust-lang/rust/issues/32925. */
9052 if (cu->language == language_rust && mangled != NULL
9053 && strchr (mangled, '{') != NULL)
9056 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
9058 if (mangled != NULL)
9062 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
9063 type. It is easier for GDB users to search for such functions as
9064 `name(params)' than `long name(params)'. In such case the minimal
9065 symbol names do not match the full symbol names but for template
9066 functions there is never a need to look up their definition from their
9067 declaration so the only disadvantage remains the minimal symbol
9068 variant `long name(params)' does not have the proper inferior type.
9071 if (cu->language == language_go)
9073 /* This is a lie, but we already lie to the caller new_symbol_full.
9074 new_symbol_full assumes we return the mangled name.
9075 This just undoes that lie until things are cleaned up. */
9080 demangled = gdb_demangle (mangled,
9081 (DMGL_PARAMS | DMGL_ANSI | DMGL_RET_DROP));
9085 make_cleanup (xfree, demangled);
9095 if (canon == NULL || check_physname)
9097 const char *physname = dwarf2_compute_name (name, die, cu, 1);
9099 if (canon != NULL && strcmp (physname, canon) != 0)
9101 /* It may not mean a bug in GDB. The compiler could also
9102 compute DW_AT_linkage_name incorrectly. But in such case
9103 GDB would need to be bug-to-bug compatible. */
9105 complaint (&symfile_complaints,
9106 _("Computed physname <%s> does not match demangled <%s> "
9107 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
9108 physname, canon, mangled, to_underlying (die->sect_off),
9109 objfile_name (objfile));
9111 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
9112 is available here - over computed PHYSNAME. It is safer
9113 against both buggy GDB and buggy compilers. */
9127 retval = ((const char *)
9128 obstack_copy0 (&objfile->per_bfd->storage_obstack,
9129 retval, strlen (retval)));
9131 do_cleanups (back_to);
9135 /* Inspect DIE in CU for a namespace alias. If one exists, record
9136 a new symbol for it.
9138 Returns 1 if a namespace alias was recorded, 0 otherwise. */
9141 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
9143 struct attribute *attr;
9145 /* If the die does not have a name, this is not a namespace
9147 attr = dwarf2_attr (die, DW_AT_name, cu);
9151 struct die_info *d = die;
9152 struct dwarf2_cu *imported_cu = cu;
9154 /* If the compiler has nested DW_AT_imported_declaration DIEs,
9155 keep inspecting DIEs until we hit the underlying import. */
9156 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
9157 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
9159 attr = dwarf2_attr (d, DW_AT_import, cu);
9163 d = follow_die_ref (d, attr, &imported_cu);
9164 if (d->tag != DW_TAG_imported_declaration)
9168 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
9170 complaint (&symfile_complaints,
9171 _("DIE at 0x%x has too many recursively imported "
9172 "declarations"), to_underlying (d->sect_off));
9179 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
9181 type = get_die_type_at_offset (sect_off, cu->per_cu);
9182 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
9184 /* This declaration is a global namespace alias. Add
9185 a symbol for it whose type is the aliased namespace. */
9186 new_symbol (die, type, cu);
9195 /* Return the using directives repository (global or local?) to use in the
9196 current context for LANGUAGE.
9198 For Ada, imported declarations can materialize renamings, which *may* be
9199 global. However it is impossible (for now?) in DWARF to distinguish
9200 "external" imported declarations and "static" ones. As all imported
9201 declarations seem to be static in all other languages, make them all CU-wide
9202 global only in Ada. */
9204 static struct using_direct **
9205 using_directives (enum language language)
9207 if (language == language_ada && context_stack_depth == 0)
9208 return &global_using_directives;
9210 return &local_using_directives;
9213 /* Read the import statement specified by the given die and record it. */
9216 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
9218 struct objfile *objfile = cu->objfile;
9219 struct attribute *import_attr;
9220 struct die_info *imported_die, *child_die;
9221 struct dwarf2_cu *imported_cu;
9222 const char *imported_name;
9223 const char *imported_name_prefix;
9224 const char *canonical_name;
9225 const char *import_alias;
9226 const char *imported_declaration = NULL;
9227 const char *import_prefix;
9228 VEC (const_char_ptr) *excludes = NULL;
9229 struct cleanup *cleanups;
9231 import_attr = dwarf2_attr (die, DW_AT_import, cu);
9232 if (import_attr == NULL)
9234 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9235 dwarf_tag_name (die->tag));
9240 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
9241 imported_name = dwarf2_name (imported_die, imported_cu);
9242 if (imported_name == NULL)
9244 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
9246 The import in the following code:
9260 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
9261 <52> DW_AT_decl_file : 1
9262 <53> DW_AT_decl_line : 6
9263 <54> DW_AT_import : <0x75>
9264 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
9266 <5b> DW_AT_decl_file : 1
9267 <5c> DW_AT_decl_line : 2
9268 <5d> DW_AT_type : <0x6e>
9270 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
9271 <76> DW_AT_byte_size : 4
9272 <77> DW_AT_encoding : 5 (signed)
9274 imports the wrong die ( 0x75 instead of 0x58 ).
9275 This case will be ignored until the gcc bug is fixed. */
9279 /* Figure out the local name after import. */
9280 import_alias = dwarf2_name (die, cu);
9282 /* Figure out where the statement is being imported to. */
9283 import_prefix = determine_prefix (die, cu);
9285 /* Figure out what the scope of the imported die is and prepend it
9286 to the name of the imported die. */
9287 imported_name_prefix = determine_prefix (imported_die, imported_cu);
9289 if (imported_die->tag != DW_TAG_namespace
9290 && imported_die->tag != DW_TAG_module)
9292 imported_declaration = imported_name;
9293 canonical_name = imported_name_prefix;
9295 else if (strlen (imported_name_prefix) > 0)
9296 canonical_name = obconcat (&objfile->objfile_obstack,
9297 imported_name_prefix,
9298 (cu->language == language_d ? "." : "::"),
9299 imported_name, (char *) NULL);
9301 canonical_name = imported_name;
9303 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
9305 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
9306 for (child_die = die->child; child_die && child_die->tag;
9307 child_die = sibling_die (child_die))
9309 /* DWARF-4: A Fortran use statement with a “rename list” may be
9310 represented by an imported module entry with an import attribute
9311 referring to the module and owned entries corresponding to those
9312 entities that are renamed as part of being imported. */
9314 if (child_die->tag != DW_TAG_imported_declaration)
9316 complaint (&symfile_complaints,
9317 _("child DW_TAG_imported_declaration expected "
9318 "- DIE at 0x%x [in module %s]"),
9319 to_underlying (child_die->sect_off), objfile_name (objfile));
9323 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
9324 if (import_attr == NULL)
9326 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9327 dwarf_tag_name (child_die->tag));
9332 imported_die = follow_die_ref_or_sig (child_die, import_attr,
9334 imported_name = dwarf2_name (imported_die, imported_cu);
9335 if (imported_name == NULL)
9337 complaint (&symfile_complaints,
9338 _("child DW_TAG_imported_declaration has unknown "
9339 "imported name - DIE at 0x%x [in module %s]"),
9340 to_underlying (child_die->sect_off), objfile_name (objfile));
9344 VEC_safe_push (const_char_ptr, excludes, imported_name);
9346 process_die (child_die, cu);
9349 add_using_directive (using_directives (cu->language),
9353 imported_declaration,
9356 &objfile->objfile_obstack);
9358 do_cleanups (cleanups);
9361 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
9362 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
9363 this, it was first present in GCC release 4.3.0. */
9366 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
9368 if (!cu->checked_producer)
9369 check_producer (cu);
9371 return cu->producer_is_gcc_lt_4_3;
9374 static file_and_directory
9375 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
9377 file_and_directory res;
9379 /* Find the filename. Do not use dwarf2_name here, since the filename
9380 is not a source language identifier. */
9381 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
9382 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
9384 if (res.comp_dir == NULL
9385 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
9386 && IS_ABSOLUTE_PATH (res.name))
9388 res.comp_dir_storage = ldirname (res.name);
9389 if (!res.comp_dir_storage.empty ())
9390 res.comp_dir = res.comp_dir_storage.c_str ();
9392 if (res.comp_dir != NULL)
9394 /* Irix 6.2 native cc prepends <machine>.: to the compilation
9395 directory, get rid of it. */
9396 const char *cp = strchr (res.comp_dir, ':');
9398 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
9399 res.comp_dir = cp + 1;
9402 if (res.name == NULL)
9403 res.name = "<unknown>";
9408 /* Handle DW_AT_stmt_list for a compilation unit.
9409 DIE is the DW_TAG_compile_unit die for CU.
9410 COMP_DIR is the compilation directory. LOWPC is passed to
9411 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
9414 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
9415 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
9417 struct objfile *objfile = dwarf2_per_objfile->objfile;
9418 struct attribute *attr;
9419 struct line_header line_header_local;
9420 hashval_t line_header_local_hash;
9425 gdb_assert (! cu->per_cu->is_debug_types);
9427 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9431 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
9433 /* The line header hash table is only created if needed (it exists to
9434 prevent redundant reading of the line table for partial_units).
9435 If we're given a partial_unit, we'll need it. If we're given a
9436 compile_unit, then use the line header hash table if it's already
9437 created, but don't create one just yet. */
9439 if (dwarf2_per_objfile->line_header_hash == NULL
9440 && die->tag == DW_TAG_partial_unit)
9442 dwarf2_per_objfile->line_header_hash
9443 = htab_create_alloc_ex (127, line_header_hash_voidp,
9444 line_header_eq_voidp,
9445 free_line_header_voidp,
9446 &objfile->objfile_obstack,
9447 hashtab_obstack_allocate,
9448 dummy_obstack_deallocate);
9451 line_header_local.sect_off = line_offset;
9452 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
9453 line_header_local_hash = line_header_hash (&line_header_local);
9454 if (dwarf2_per_objfile->line_header_hash != NULL)
9456 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9458 line_header_local_hash, NO_INSERT);
9460 /* For DW_TAG_compile_unit we need info like symtab::linetable which
9461 is not present in *SLOT (since if there is something in *SLOT then
9462 it will be for a partial_unit). */
9463 if (die->tag == DW_TAG_partial_unit && slot != NULL)
9465 gdb_assert (*slot != NULL);
9466 cu->line_header = (struct line_header *) *slot;
9471 /* dwarf_decode_line_header does not yet provide sufficient information.
9472 We always have to call also dwarf_decode_lines for it. */
9473 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
9477 cu->line_header = lh.release ();
9478 cu->line_header_die_owner = die;
9480 if (dwarf2_per_objfile->line_header_hash == NULL)
9484 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9486 line_header_local_hash, INSERT);
9487 gdb_assert (slot != NULL);
9489 if (slot != NULL && *slot == NULL)
9491 /* This newly decoded line number information unit will be owned
9492 by line_header_hash hash table. */
9493 *slot = cu->line_header;
9494 cu->line_header_die_owner = NULL;
9498 /* We cannot free any current entry in (*slot) as that struct line_header
9499 may be already used by multiple CUs. Create only temporary decoded
9500 line_header for this CU - it may happen at most once for each line
9501 number information unit. And if we're not using line_header_hash
9502 then this is what we want as well. */
9503 gdb_assert (die->tag != DW_TAG_partial_unit);
9505 decode_mapping = (die->tag != DW_TAG_partial_unit);
9506 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
9511 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
9514 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
9516 struct objfile *objfile = dwarf2_per_objfile->objfile;
9517 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9518 CORE_ADDR lowpc = ((CORE_ADDR) -1);
9519 CORE_ADDR highpc = ((CORE_ADDR) 0);
9520 struct attribute *attr;
9521 struct die_info *child_die;
9524 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9526 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
9528 /* If we didn't find a lowpc, set it to highpc to avoid complaints
9529 from finish_block. */
9530 if (lowpc == ((CORE_ADDR) -1))
9532 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
9534 file_and_directory fnd = find_file_and_directory (die, cu);
9536 prepare_one_comp_unit (cu, die, cu->language);
9538 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
9539 standardised yet. As a workaround for the language detection we fall
9540 back to the DW_AT_producer string. */
9541 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
9542 cu->language = language_opencl;
9544 /* Similar hack for Go. */
9545 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
9546 set_cu_language (DW_LANG_Go, cu);
9548 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
9550 /* Decode line number information if present. We do this before
9551 processing child DIEs, so that the line header table is available
9552 for DW_AT_decl_file. */
9553 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
9555 /* Process all dies in compilation unit. */
9556 if (die->child != NULL)
9558 child_die = die->child;
9559 while (child_die && child_die->tag)
9561 process_die (child_die, cu);
9562 child_die = sibling_die (child_die);
9566 /* Decode macro information, if present. Dwarf 2 macro information
9567 refers to information in the line number info statement program
9568 header, so we can only read it if we've read the header
9570 attr = dwarf2_attr (die, DW_AT_macros, cu);
9572 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
9573 if (attr && cu->line_header)
9575 if (dwarf2_attr (die, DW_AT_macro_info, cu))
9576 complaint (&symfile_complaints,
9577 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
9579 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
9583 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
9584 if (attr && cu->line_header)
9586 unsigned int macro_offset = DW_UNSND (attr);
9588 dwarf_decode_macros (cu, macro_offset, 0);
9593 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
9594 Create the set of symtabs used by this TU, or if this TU is sharing
9595 symtabs with another TU and the symtabs have already been created
9596 then restore those symtabs in the line header.
9597 We don't need the pc/line-number mapping for type units. */
9600 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
9602 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
9603 struct type_unit_group *tu_group;
9605 struct attribute *attr;
9607 struct signatured_type *sig_type;
9609 gdb_assert (per_cu->is_debug_types);
9610 sig_type = (struct signatured_type *) per_cu;
9612 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9614 /* If we're using .gdb_index (includes -readnow) then
9615 per_cu->type_unit_group may not have been set up yet. */
9616 if (sig_type->type_unit_group == NULL)
9617 sig_type->type_unit_group = get_type_unit_group (cu, attr);
9618 tu_group = sig_type->type_unit_group;
9620 /* If we've already processed this stmt_list there's no real need to
9621 do it again, we could fake it and just recreate the part we need
9622 (file name,index -> symtab mapping). If data shows this optimization
9623 is useful we can do it then. */
9624 first_time = tu_group->compunit_symtab == NULL;
9626 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
9631 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
9632 lh = dwarf_decode_line_header (line_offset, cu);
9637 dwarf2_start_symtab (cu, "", NULL, 0);
9640 gdb_assert (tu_group->symtabs == NULL);
9641 restart_symtab (tu_group->compunit_symtab, "", 0);
9646 cu->line_header = lh.release ();
9647 cu->line_header_die_owner = die;
9651 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
9653 /* Note: We don't assign tu_group->compunit_symtab yet because we're
9654 still initializing it, and our caller (a few levels up)
9655 process_full_type_unit still needs to know if this is the first
9658 tu_group->num_symtabs = cu->line_header->file_names.size ();
9659 tu_group->symtabs = XNEWVEC (struct symtab *,
9660 cu->line_header->file_names.size ());
9662 for (i = 0; i < cu->line_header->file_names.size (); ++i)
9664 file_entry &fe = cu->line_header->file_names[i];
9666 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
9668 if (current_subfile->symtab == NULL)
9670 /* NOTE: start_subfile will recognize when it's been
9671 passed a file it has already seen. So we can't
9672 assume there's a simple mapping from
9673 cu->line_header->file_names to subfiles, plus
9674 cu->line_header->file_names may contain dups. */
9675 current_subfile->symtab
9676 = allocate_symtab (cust, current_subfile->name);
9679 fe.symtab = current_subfile->symtab;
9680 tu_group->symtabs[i] = fe.symtab;
9685 restart_symtab (tu_group->compunit_symtab, "", 0);
9687 for (i = 0; i < cu->line_header->file_names.size (); ++i)
9689 file_entry &fe = cu->line_header->file_names[i];
9691 fe.symtab = tu_group->symtabs[i];
9695 /* The main symtab is allocated last. Type units don't have DW_AT_name
9696 so they don't have a "real" (so to speak) symtab anyway.
9697 There is later code that will assign the main symtab to all symbols
9698 that don't have one. We need to handle the case of a symbol with a
9699 missing symtab (DW_AT_decl_file) anyway. */
9702 /* Process DW_TAG_type_unit.
9703 For TUs we want to skip the first top level sibling if it's not the
9704 actual type being defined by this TU. In this case the first top
9705 level sibling is there to provide context only. */
9708 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
9710 struct die_info *child_die;
9712 prepare_one_comp_unit (cu, die, language_minimal);
9714 /* Initialize (or reinitialize) the machinery for building symtabs.
9715 We do this before processing child DIEs, so that the line header table
9716 is available for DW_AT_decl_file. */
9717 setup_type_unit_groups (die, cu);
9719 if (die->child != NULL)
9721 child_die = die->child;
9722 while (child_die && child_die->tag)
9724 process_die (child_die, cu);
9725 child_die = sibling_die (child_die);
9732 http://gcc.gnu.org/wiki/DebugFission
9733 http://gcc.gnu.org/wiki/DebugFissionDWP
9735 To simplify handling of both DWO files ("object" files with the DWARF info)
9736 and DWP files (a file with the DWOs packaged up into one file), we treat
9737 DWP files as having a collection of virtual DWO files. */
9740 hash_dwo_file (const void *item)
9742 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
9745 hash = htab_hash_string (dwo_file->dwo_name);
9746 if (dwo_file->comp_dir != NULL)
9747 hash += htab_hash_string (dwo_file->comp_dir);
9752 eq_dwo_file (const void *item_lhs, const void *item_rhs)
9754 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
9755 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
9757 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
9759 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
9760 return lhs->comp_dir == rhs->comp_dir;
9761 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
9764 /* Allocate a hash table for DWO files. */
9767 allocate_dwo_file_hash_table (void)
9769 struct objfile *objfile = dwarf2_per_objfile->objfile;
9771 return htab_create_alloc_ex (41,
9775 &objfile->objfile_obstack,
9776 hashtab_obstack_allocate,
9777 dummy_obstack_deallocate);
9780 /* Lookup DWO file DWO_NAME. */
9783 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
9785 struct dwo_file find_entry;
9788 if (dwarf2_per_objfile->dwo_files == NULL)
9789 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
9791 memset (&find_entry, 0, sizeof (find_entry));
9792 find_entry.dwo_name = dwo_name;
9793 find_entry.comp_dir = comp_dir;
9794 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
9800 hash_dwo_unit (const void *item)
9802 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
9804 /* This drops the top 32 bits of the id, but is ok for a hash. */
9805 return dwo_unit->signature;
9809 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
9811 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
9812 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
9814 /* The signature is assumed to be unique within the DWO file.
9815 So while object file CU dwo_id's always have the value zero,
9816 that's OK, assuming each object file DWO file has only one CU,
9817 and that's the rule for now. */
9818 return lhs->signature == rhs->signature;
9821 /* Allocate a hash table for DWO CUs,TUs.
9822 There is one of these tables for each of CUs,TUs for each DWO file. */
9825 allocate_dwo_unit_table (struct objfile *objfile)
9827 /* Start out with a pretty small number.
9828 Generally DWO files contain only one CU and maybe some TUs. */
9829 return htab_create_alloc_ex (3,
9833 &objfile->objfile_obstack,
9834 hashtab_obstack_allocate,
9835 dummy_obstack_deallocate);
9838 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
9840 struct create_dwo_cu_data
9842 struct dwo_file *dwo_file;
9843 struct dwo_unit dwo_unit;
9846 /* die_reader_func for create_dwo_cu. */
9849 create_dwo_cu_reader (const struct die_reader_specs *reader,
9850 const gdb_byte *info_ptr,
9851 struct die_info *comp_unit_die,
9855 struct dwarf2_cu *cu = reader->cu;
9856 sect_offset sect_off = cu->per_cu->sect_off;
9857 struct dwarf2_section_info *section = cu->per_cu->section;
9858 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
9859 struct dwo_file *dwo_file = data->dwo_file;
9860 struct dwo_unit *dwo_unit = &data->dwo_unit;
9861 struct attribute *attr;
9863 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
9866 complaint (&symfile_complaints,
9867 _("Dwarf Error: debug entry at offset 0x%x is missing"
9868 " its dwo_id [in module %s]"),
9869 to_underlying (sect_off), dwo_file->dwo_name);
9873 dwo_unit->dwo_file = dwo_file;
9874 dwo_unit->signature = DW_UNSND (attr);
9875 dwo_unit->section = section;
9876 dwo_unit->sect_off = sect_off;
9877 dwo_unit->length = cu->per_cu->length;
9879 if (dwarf_read_debug)
9880 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
9881 to_underlying (sect_off),
9882 hex_string (dwo_unit->signature));
9885 /* Create the dwo_units for the CUs in a DWO_FILE.
9886 Note: This function processes DWO files only, not DWP files. */
9889 create_cus_hash_table (struct dwo_file &dwo_file, dwarf2_section_info §ion,
9892 struct objfile *objfile = dwarf2_per_objfile->objfile;
9893 const struct dwarf2_section_info *abbrev_section = &dwo_file.sections.abbrev;
9894 const gdb_byte *info_ptr, *end_ptr;
9896 dwarf2_read_section (objfile, §ion);
9897 info_ptr = section.buffer;
9899 if (info_ptr == NULL)
9902 if (dwarf_read_debug)
9904 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
9905 get_section_name (§ion),
9906 get_section_file_name (§ion));
9909 end_ptr = info_ptr + section.size;
9910 while (info_ptr < end_ptr)
9912 struct dwarf2_per_cu_data per_cu;
9913 struct create_dwo_cu_data create_dwo_cu_data;
9914 struct dwo_unit *dwo_unit;
9916 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
9918 memset (&create_dwo_cu_data.dwo_unit, 0,
9919 sizeof (create_dwo_cu_data.dwo_unit));
9920 memset (&per_cu, 0, sizeof (per_cu));
9921 per_cu.objfile = objfile;
9922 per_cu.is_debug_types = 0;
9923 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
9924 per_cu.section = §ion;
9925 create_dwo_cu_data.dwo_file = &dwo_file;
9927 init_cutu_and_read_dies_no_follow (
9928 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
9929 info_ptr += per_cu.length;
9931 // If the unit could not be parsed, skip it.
9932 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
9935 if (cus_htab == NULL)
9936 cus_htab = allocate_dwo_unit_table (objfile);
9938 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9939 *dwo_unit = create_dwo_cu_data.dwo_unit;
9940 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
9941 gdb_assert (slot != NULL);
9944 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
9945 sect_offset dup_sect_off = dup_cu->sect_off;
9947 complaint (&symfile_complaints,
9948 _("debug cu entry at offset 0x%x is duplicate to"
9949 " the entry at offset 0x%x, signature %s"),
9950 to_underlying (sect_off), to_underlying (dup_sect_off),
9951 hex_string (dwo_unit->signature));
9953 *slot = (void *)dwo_unit;
9957 /* DWP file .debug_{cu,tu}_index section format:
9958 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
9962 Both index sections have the same format, and serve to map a 64-bit
9963 signature to a set of section numbers. Each section begins with a header,
9964 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
9965 indexes, and a pool of 32-bit section numbers. The index sections will be
9966 aligned at 8-byte boundaries in the file.
9968 The index section header consists of:
9970 V, 32 bit version number
9972 N, 32 bit number of compilation units or type units in the index
9973 M, 32 bit number of slots in the hash table
9975 Numbers are recorded using the byte order of the application binary.
9977 The hash table begins at offset 16 in the section, and consists of an array
9978 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
9979 order of the application binary). Unused slots in the hash table are 0.
9980 (We rely on the extreme unlikeliness of a signature being exactly 0.)
9982 The parallel table begins immediately after the hash table
9983 (at offset 16 + 8 * M from the beginning of the section), and consists of an
9984 array of 32-bit indexes (using the byte order of the application binary),
9985 corresponding 1-1 with slots in the hash table. Each entry in the parallel
9986 table contains a 32-bit index into the pool of section numbers. For unused
9987 hash table slots, the corresponding entry in the parallel table will be 0.
9989 The pool of section numbers begins immediately following the hash table
9990 (at offset 16 + 12 * M from the beginning of the section). The pool of
9991 section numbers consists of an array of 32-bit words (using the byte order
9992 of the application binary). Each item in the array is indexed starting
9993 from 0. The hash table entry provides the index of the first section
9994 number in the set. Additional section numbers in the set follow, and the
9995 set is terminated by a 0 entry (section number 0 is not used in ELF).
9997 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
9998 section must be the first entry in the set, and the .debug_abbrev.dwo must
9999 be the second entry. Other members of the set may follow in any order.
10005 DWP Version 2 combines all the .debug_info, etc. sections into one,
10006 and the entries in the index tables are now offsets into these sections.
10007 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
10010 Index Section Contents:
10012 Hash Table of Signatures dwp_hash_table.hash_table
10013 Parallel Table of Indices dwp_hash_table.unit_table
10014 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
10015 Table of Section Sizes dwp_hash_table.v2.sizes
10017 The index section header consists of:
10019 V, 32 bit version number
10020 L, 32 bit number of columns in the table of section offsets
10021 N, 32 bit number of compilation units or type units in the index
10022 M, 32 bit number of slots in the hash table
10024 Numbers are recorded using the byte order of the application binary.
10026 The hash table has the same format as version 1.
10027 The parallel table of indices has the same format as version 1,
10028 except that the entries are origin-1 indices into the table of sections
10029 offsets and the table of section sizes.
10031 The table of offsets begins immediately following the parallel table
10032 (at offset 16 + 12 * M from the beginning of the section). The table is
10033 a two-dimensional array of 32-bit words (using the byte order of the
10034 application binary), with L columns and N+1 rows, in row-major order.
10035 Each row in the array is indexed starting from 0. The first row provides
10036 a key to the remaining rows: each column in this row provides an identifier
10037 for a debug section, and the offsets in the same column of subsequent rows
10038 refer to that section. The section identifiers are:
10040 DW_SECT_INFO 1 .debug_info.dwo
10041 DW_SECT_TYPES 2 .debug_types.dwo
10042 DW_SECT_ABBREV 3 .debug_abbrev.dwo
10043 DW_SECT_LINE 4 .debug_line.dwo
10044 DW_SECT_LOC 5 .debug_loc.dwo
10045 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
10046 DW_SECT_MACINFO 7 .debug_macinfo.dwo
10047 DW_SECT_MACRO 8 .debug_macro.dwo
10049 The offsets provided by the CU and TU index sections are the base offsets
10050 for the contributions made by each CU or TU to the corresponding section
10051 in the package file. Each CU and TU header contains an abbrev_offset
10052 field, used to find the abbreviations table for that CU or TU within the
10053 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
10054 be interpreted as relative to the base offset given in the index section.
10055 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
10056 should be interpreted as relative to the base offset for .debug_line.dwo,
10057 and offsets into other debug sections obtained from DWARF attributes should
10058 also be interpreted as relative to the corresponding base offset.
10060 The table of sizes begins immediately following the table of offsets.
10061 Like the table of offsets, it is a two-dimensional array of 32-bit words,
10062 with L columns and N rows, in row-major order. Each row in the array is
10063 indexed starting from 1 (row 0 is shared by the two tables).
10067 Hash table lookup is handled the same in version 1 and 2:
10069 We assume that N and M will not exceed 2^32 - 1.
10070 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
10072 Given a 64-bit compilation unit signature or a type signature S, an entry
10073 in the hash table is located as follows:
10075 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
10076 the low-order k bits all set to 1.
10078 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
10080 3) If the hash table entry at index H matches the signature, use that
10081 entry. If the hash table entry at index H is unused (all zeroes),
10082 terminate the search: the signature is not present in the table.
10084 4) Let H = (H + H') modulo M. Repeat at Step 3.
10086 Because M > N and H' and M are relatively prime, the search is guaranteed
10087 to stop at an unused slot or find the match. */
10089 /* Create a hash table to map DWO IDs to their CU/TU entry in
10090 .debug_{info,types}.dwo in DWP_FILE.
10091 Returns NULL if there isn't one.
10092 Note: This function processes DWP files only, not DWO files. */
10094 static struct dwp_hash_table *
10095 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
10097 struct objfile *objfile = dwarf2_per_objfile->objfile;
10098 bfd *dbfd = dwp_file->dbfd;
10099 const gdb_byte *index_ptr, *index_end;
10100 struct dwarf2_section_info *index;
10101 uint32_t version, nr_columns, nr_units, nr_slots;
10102 struct dwp_hash_table *htab;
10104 if (is_debug_types)
10105 index = &dwp_file->sections.tu_index;
10107 index = &dwp_file->sections.cu_index;
10109 if (dwarf2_section_empty_p (index))
10111 dwarf2_read_section (objfile, index);
10113 index_ptr = index->buffer;
10114 index_end = index_ptr + index->size;
10116 version = read_4_bytes (dbfd, index_ptr);
10119 nr_columns = read_4_bytes (dbfd, index_ptr);
10123 nr_units = read_4_bytes (dbfd, index_ptr);
10125 nr_slots = read_4_bytes (dbfd, index_ptr);
10128 if (version != 1 && version != 2)
10130 error (_("Dwarf Error: unsupported DWP file version (%s)"
10131 " [in module %s]"),
10132 pulongest (version), dwp_file->name);
10134 if (nr_slots != (nr_slots & -nr_slots))
10136 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
10137 " is not power of 2 [in module %s]"),
10138 pulongest (nr_slots), dwp_file->name);
10141 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
10142 htab->version = version;
10143 htab->nr_columns = nr_columns;
10144 htab->nr_units = nr_units;
10145 htab->nr_slots = nr_slots;
10146 htab->hash_table = index_ptr;
10147 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
10149 /* Exit early if the table is empty. */
10150 if (nr_slots == 0 || nr_units == 0
10151 || (version == 2 && nr_columns == 0))
10153 /* All must be zero. */
10154 if (nr_slots != 0 || nr_units != 0
10155 || (version == 2 && nr_columns != 0))
10157 complaint (&symfile_complaints,
10158 _("Empty DWP but nr_slots,nr_units,nr_columns not"
10159 " all zero [in modules %s]"),
10167 htab->section_pool.v1.indices =
10168 htab->unit_table + sizeof (uint32_t) * nr_slots;
10169 /* It's harder to decide whether the section is too small in v1.
10170 V1 is deprecated anyway so we punt. */
10174 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
10175 int *ids = htab->section_pool.v2.section_ids;
10176 /* Reverse map for error checking. */
10177 int ids_seen[DW_SECT_MAX + 1];
10180 if (nr_columns < 2)
10182 error (_("Dwarf Error: bad DWP hash table, too few columns"
10183 " in section table [in module %s]"),
10186 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
10188 error (_("Dwarf Error: bad DWP hash table, too many columns"
10189 " in section table [in module %s]"),
10192 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10193 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10194 for (i = 0; i < nr_columns; ++i)
10196 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
10198 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
10200 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
10201 " in section table [in module %s]"),
10202 id, dwp_file->name);
10204 if (ids_seen[id] != -1)
10206 error (_("Dwarf Error: bad DWP hash table, duplicate section"
10207 " id %d in section table [in module %s]"),
10208 id, dwp_file->name);
10213 /* Must have exactly one info or types section. */
10214 if (((ids_seen[DW_SECT_INFO] != -1)
10215 + (ids_seen[DW_SECT_TYPES] != -1))
10218 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
10219 " DWO info/types section [in module %s]"),
10222 /* Must have an abbrev section. */
10223 if (ids_seen[DW_SECT_ABBREV] == -1)
10225 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
10226 " section [in module %s]"),
10229 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
10230 htab->section_pool.v2.sizes =
10231 htab->section_pool.v2.offsets + (sizeof (uint32_t)
10232 * nr_units * nr_columns);
10233 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
10234 * nr_units * nr_columns))
10237 error (_("Dwarf Error: DWP index section is corrupt (too small)"
10238 " [in module %s]"),
10246 /* Update SECTIONS with the data from SECTP.
10248 This function is like the other "locate" section routines that are
10249 passed to bfd_map_over_sections, but in this context the sections to
10250 read comes from the DWP V1 hash table, not the full ELF section table.
10252 The result is non-zero for success, or zero if an error was found. */
10255 locate_v1_virtual_dwo_sections (asection *sectp,
10256 struct virtual_v1_dwo_sections *sections)
10258 const struct dwop_section_names *names = &dwop_section_names;
10260 if (section_is_p (sectp->name, &names->abbrev_dwo))
10262 /* There can be only one. */
10263 if (sections->abbrev.s.section != NULL)
10265 sections->abbrev.s.section = sectp;
10266 sections->abbrev.size = bfd_get_section_size (sectp);
10268 else if (section_is_p (sectp->name, &names->info_dwo)
10269 || section_is_p (sectp->name, &names->types_dwo))
10271 /* There can be only one. */
10272 if (sections->info_or_types.s.section != NULL)
10274 sections->info_or_types.s.section = sectp;
10275 sections->info_or_types.size = bfd_get_section_size (sectp);
10277 else if (section_is_p (sectp->name, &names->line_dwo))
10279 /* There can be only one. */
10280 if (sections->line.s.section != NULL)
10282 sections->line.s.section = sectp;
10283 sections->line.size = bfd_get_section_size (sectp);
10285 else if (section_is_p (sectp->name, &names->loc_dwo))
10287 /* There can be only one. */
10288 if (sections->loc.s.section != NULL)
10290 sections->loc.s.section = sectp;
10291 sections->loc.size = bfd_get_section_size (sectp);
10293 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10295 /* There can be only one. */
10296 if (sections->macinfo.s.section != NULL)
10298 sections->macinfo.s.section = sectp;
10299 sections->macinfo.size = bfd_get_section_size (sectp);
10301 else if (section_is_p (sectp->name, &names->macro_dwo))
10303 /* There can be only one. */
10304 if (sections->macro.s.section != NULL)
10306 sections->macro.s.section = sectp;
10307 sections->macro.size = bfd_get_section_size (sectp);
10309 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10311 /* There can be only one. */
10312 if (sections->str_offsets.s.section != NULL)
10314 sections->str_offsets.s.section = sectp;
10315 sections->str_offsets.size = bfd_get_section_size (sectp);
10319 /* No other kind of section is valid. */
10326 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10327 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10328 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10329 This is for DWP version 1 files. */
10331 static struct dwo_unit *
10332 create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file,
10333 uint32_t unit_index,
10334 const char *comp_dir,
10335 ULONGEST signature, int is_debug_types)
10337 struct objfile *objfile = dwarf2_per_objfile->objfile;
10338 const struct dwp_hash_table *dwp_htab =
10339 is_debug_types ? dwp_file->tus : dwp_file->cus;
10340 bfd *dbfd = dwp_file->dbfd;
10341 const char *kind = is_debug_types ? "TU" : "CU";
10342 struct dwo_file *dwo_file;
10343 struct dwo_unit *dwo_unit;
10344 struct virtual_v1_dwo_sections sections;
10345 void **dwo_file_slot;
10346 char *virtual_dwo_name;
10347 struct cleanup *cleanups;
10350 gdb_assert (dwp_file->version == 1);
10352 if (dwarf_read_debug)
10354 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
10356 pulongest (unit_index), hex_string (signature),
10360 /* Fetch the sections of this DWO unit.
10361 Put a limit on the number of sections we look for so that bad data
10362 doesn't cause us to loop forever. */
10364 #define MAX_NR_V1_DWO_SECTIONS \
10365 (1 /* .debug_info or .debug_types */ \
10366 + 1 /* .debug_abbrev */ \
10367 + 1 /* .debug_line */ \
10368 + 1 /* .debug_loc */ \
10369 + 1 /* .debug_str_offsets */ \
10370 + 1 /* .debug_macro or .debug_macinfo */ \
10371 + 1 /* trailing zero */)
10373 memset (§ions, 0, sizeof (sections));
10374 cleanups = make_cleanup (null_cleanup, 0);
10376 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
10379 uint32_t section_nr =
10380 read_4_bytes (dbfd,
10381 dwp_htab->section_pool.v1.indices
10382 + (unit_index + i) * sizeof (uint32_t));
10384 if (section_nr == 0)
10386 if (section_nr >= dwp_file->num_sections)
10388 error (_("Dwarf Error: bad DWP hash table, section number too large"
10389 " [in module %s]"),
10393 sectp = dwp_file->elf_sections[section_nr];
10394 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
10396 error (_("Dwarf Error: bad DWP hash table, invalid section found"
10397 " [in module %s]"),
10403 || dwarf2_section_empty_p (§ions.info_or_types)
10404 || dwarf2_section_empty_p (§ions.abbrev))
10406 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
10407 " [in module %s]"),
10410 if (i == MAX_NR_V1_DWO_SECTIONS)
10412 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
10413 " [in module %s]"),
10417 /* It's easier for the rest of the code if we fake a struct dwo_file and
10418 have dwo_unit "live" in that. At least for now.
10420 The DWP file can be made up of a random collection of CUs and TUs.
10421 However, for each CU + set of TUs that came from the same original DWO
10422 file, we can combine them back into a virtual DWO file to save space
10423 (fewer struct dwo_file objects to allocate). Remember that for really
10424 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10427 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
10428 get_section_id (§ions.abbrev),
10429 get_section_id (§ions.line),
10430 get_section_id (§ions.loc),
10431 get_section_id (§ions.str_offsets));
10432 make_cleanup (xfree, virtual_dwo_name);
10433 /* Can we use an existing virtual DWO file? */
10434 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10435 /* Create one if necessary. */
10436 if (*dwo_file_slot == NULL)
10438 if (dwarf_read_debug)
10440 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10443 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10445 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10447 strlen (virtual_dwo_name));
10448 dwo_file->comp_dir = comp_dir;
10449 dwo_file->sections.abbrev = sections.abbrev;
10450 dwo_file->sections.line = sections.line;
10451 dwo_file->sections.loc = sections.loc;
10452 dwo_file->sections.macinfo = sections.macinfo;
10453 dwo_file->sections.macro = sections.macro;
10454 dwo_file->sections.str_offsets = sections.str_offsets;
10455 /* The "str" section is global to the entire DWP file. */
10456 dwo_file->sections.str = dwp_file->sections.str;
10457 /* The info or types section is assigned below to dwo_unit,
10458 there's no need to record it in dwo_file.
10459 Also, we can't simply record type sections in dwo_file because
10460 we record a pointer into the vector in dwo_unit. As we collect more
10461 types we'll grow the vector and eventually have to reallocate space
10462 for it, invalidating all copies of pointers into the previous
10464 *dwo_file_slot = dwo_file;
10468 if (dwarf_read_debug)
10470 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10473 dwo_file = (struct dwo_file *) *dwo_file_slot;
10475 do_cleanups (cleanups);
10477 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10478 dwo_unit->dwo_file = dwo_file;
10479 dwo_unit->signature = signature;
10480 dwo_unit->section =
10481 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10482 *dwo_unit->section = sections.info_or_types;
10483 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10488 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
10489 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
10490 piece within that section used by a TU/CU, return a virtual section
10491 of just that piece. */
10493 static struct dwarf2_section_info
10494 create_dwp_v2_section (struct dwarf2_section_info *section,
10495 bfd_size_type offset, bfd_size_type size)
10497 struct dwarf2_section_info result;
10500 gdb_assert (section != NULL);
10501 gdb_assert (!section->is_virtual);
10503 memset (&result, 0, sizeof (result));
10504 result.s.containing_section = section;
10505 result.is_virtual = 1;
10510 sectp = get_section_bfd_section (section);
10512 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
10513 bounds of the real section. This is a pretty-rare event, so just
10514 flag an error (easier) instead of a warning and trying to cope. */
10516 || offset + size > bfd_get_section_size (sectp))
10518 bfd *abfd = sectp->owner;
10520 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
10521 " in section %s [in module %s]"),
10522 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
10523 objfile_name (dwarf2_per_objfile->objfile));
10526 result.virtual_offset = offset;
10527 result.size = size;
10531 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10532 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10533 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10534 This is for DWP version 2 files. */
10536 static struct dwo_unit *
10537 create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file,
10538 uint32_t unit_index,
10539 const char *comp_dir,
10540 ULONGEST signature, int is_debug_types)
10542 struct objfile *objfile = dwarf2_per_objfile->objfile;
10543 const struct dwp_hash_table *dwp_htab =
10544 is_debug_types ? dwp_file->tus : dwp_file->cus;
10545 bfd *dbfd = dwp_file->dbfd;
10546 const char *kind = is_debug_types ? "TU" : "CU";
10547 struct dwo_file *dwo_file;
10548 struct dwo_unit *dwo_unit;
10549 struct virtual_v2_dwo_sections sections;
10550 void **dwo_file_slot;
10551 char *virtual_dwo_name;
10552 struct cleanup *cleanups;
10555 gdb_assert (dwp_file->version == 2);
10557 if (dwarf_read_debug)
10559 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
10561 pulongest (unit_index), hex_string (signature),
10565 /* Fetch the section offsets of this DWO unit. */
10567 memset (§ions, 0, sizeof (sections));
10568 cleanups = make_cleanup (null_cleanup, 0);
10570 for (i = 0; i < dwp_htab->nr_columns; ++i)
10572 uint32_t offset = read_4_bytes (dbfd,
10573 dwp_htab->section_pool.v2.offsets
10574 + (((unit_index - 1) * dwp_htab->nr_columns
10576 * sizeof (uint32_t)));
10577 uint32_t size = read_4_bytes (dbfd,
10578 dwp_htab->section_pool.v2.sizes
10579 + (((unit_index - 1) * dwp_htab->nr_columns
10581 * sizeof (uint32_t)));
10583 switch (dwp_htab->section_pool.v2.section_ids[i])
10586 case DW_SECT_TYPES:
10587 sections.info_or_types_offset = offset;
10588 sections.info_or_types_size = size;
10590 case DW_SECT_ABBREV:
10591 sections.abbrev_offset = offset;
10592 sections.abbrev_size = size;
10595 sections.line_offset = offset;
10596 sections.line_size = size;
10599 sections.loc_offset = offset;
10600 sections.loc_size = size;
10602 case DW_SECT_STR_OFFSETS:
10603 sections.str_offsets_offset = offset;
10604 sections.str_offsets_size = size;
10606 case DW_SECT_MACINFO:
10607 sections.macinfo_offset = offset;
10608 sections.macinfo_size = size;
10610 case DW_SECT_MACRO:
10611 sections.macro_offset = offset;
10612 sections.macro_size = size;
10617 /* It's easier for the rest of the code if we fake a struct dwo_file and
10618 have dwo_unit "live" in that. At least for now.
10620 The DWP file can be made up of a random collection of CUs and TUs.
10621 However, for each CU + set of TUs that came from the same original DWO
10622 file, we can combine them back into a virtual DWO file to save space
10623 (fewer struct dwo_file objects to allocate). Remember that for really
10624 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10627 xstrprintf ("virtual-dwo/%ld-%ld-%ld-%ld",
10628 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
10629 (long) (sections.line_size ? sections.line_offset : 0),
10630 (long) (sections.loc_size ? sections.loc_offset : 0),
10631 (long) (sections.str_offsets_size
10632 ? sections.str_offsets_offset : 0));
10633 make_cleanup (xfree, virtual_dwo_name);
10634 /* Can we use an existing virtual DWO file? */
10635 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10636 /* Create one if necessary. */
10637 if (*dwo_file_slot == NULL)
10639 if (dwarf_read_debug)
10641 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10644 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10646 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10648 strlen (virtual_dwo_name));
10649 dwo_file->comp_dir = comp_dir;
10650 dwo_file->sections.abbrev =
10651 create_dwp_v2_section (&dwp_file->sections.abbrev,
10652 sections.abbrev_offset, sections.abbrev_size);
10653 dwo_file->sections.line =
10654 create_dwp_v2_section (&dwp_file->sections.line,
10655 sections.line_offset, sections.line_size);
10656 dwo_file->sections.loc =
10657 create_dwp_v2_section (&dwp_file->sections.loc,
10658 sections.loc_offset, sections.loc_size);
10659 dwo_file->sections.macinfo =
10660 create_dwp_v2_section (&dwp_file->sections.macinfo,
10661 sections.macinfo_offset, sections.macinfo_size);
10662 dwo_file->sections.macro =
10663 create_dwp_v2_section (&dwp_file->sections.macro,
10664 sections.macro_offset, sections.macro_size);
10665 dwo_file->sections.str_offsets =
10666 create_dwp_v2_section (&dwp_file->sections.str_offsets,
10667 sections.str_offsets_offset,
10668 sections.str_offsets_size);
10669 /* The "str" section is global to the entire DWP file. */
10670 dwo_file->sections.str = dwp_file->sections.str;
10671 /* The info or types section is assigned below to dwo_unit,
10672 there's no need to record it in dwo_file.
10673 Also, we can't simply record type sections in dwo_file because
10674 we record a pointer into the vector in dwo_unit. As we collect more
10675 types we'll grow the vector and eventually have to reallocate space
10676 for it, invalidating all copies of pointers into the previous
10678 *dwo_file_slot = dwo_file;
10682 if (dwarf_read_debug)
10684 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10687 dwo_file = (struct dwo_file *) *dwo_file_slot;
10689 do_cleanups (cleanups);
10691 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10692 dwo_unit->dwo_file = dwo_file;
10693 dwo_unit->signature = signature;
10694 dwo_unit->section =
10695 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10696 *dwo_unit->section = create_dwp_v2_section (is_debug_types
10697 ? &dwp_file->sections.types
10698 : &dwp_file->sections.info,
10699 sections.info_or_types_offset,
10700 sections.info_or_types_size);
10701 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10706 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
10707 Returns NULL if the signature isn't found. */
10709 static struct dwo_unit *
10710 lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir,
10711 ULONGEST signature, int is_debug_types)
10713 const struct dwp_hash_table *dwp_htab =
10714 is_debug_types ? dwp_file->tus : dwp_file->cus;
10715 bfd *dbfd = dwp_file->dbfd;
10716 uint32_t mask = dwp_htab->nr_slots - 1;
10717 uint32_t hash = signature & mask;
10718 uint32_t hash2 = ((signature >> 32) & mask) | 1;
10721 struct dwo_unit find_dwo_cu;
10723 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
10724 find_dwo_cu.signature = signature;
10725 slot = htab_find_slot (is_debug_types
10726 ? dwp_file->loaded_tus
10727 : dwp_file->loaded_cus,
10728 &find_dwo_cu, INSERT);
10731 return (struct dwo_unit *) *slot;
10733 /* Use a for loop so that we don't loop forever on bad debug info. */
10734 for (i = 0; i < dwp_htab->nr_slots; ++i)
10736 ULONGEST signature_in_table;
10738 signature_in_table =
10739 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
10740 if (signature_in_table == signature)
10742 uint32_t unit_index =
10743 read_4_bytes (dbfd,
10744 dwp_htab->unit_table + hash * sizeof (uint32_t));
10746 if (dwp_file->version == 1)
10748 *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index,
10749 comp_dir, signature,
10754 *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index,
10755 comp_dir, signature,
10758 return (struct dwo_unit *) *slot;
10760 if (signature_in_table == 0)
10762 hash = (hash + hash2) & mask;
10765 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
10766 " [in module %s]"),
10770 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
10771 Open the file specified by FILE_NAME and hand it off to BFD for
10772 preliminary analysis. Return a newly initialized bfd *, which
10773 includes a canonicalized copy of FILE_NAME.
10774 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
10775 SEARCH_CWD is true if the current directory is to be searched.
10776 It will be searched before debug-file-directory.
10777 If successful, the file is added to the bfd include table of the
10778 objfile's bfd (see gdb_bfd_record_inclusion).
10779 If unable to find/open the file, return NULL.
10780 NOTE: This function is derived from symfile_bfd_open. */
10782 static gdb_bfd_ref_ptr
10783 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
10786 char *absolute_name;
10787 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
10788 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
10789 to debug_file_directory. */
10791 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
10795 if (*debug_file_directory != '\0')
10796 search_path = concat (".", dirname_separator_string,
10797 debug_file_directory, (char *) NULL);
10799 search_path = xstrdup (".");
10802 search_path = xstrdup (debug_file_directory);
10804 flags = OPF_RETURN_REALPATH;
10806 flags |= OPF_SEARCH_IN_PATH;
10807 desc = openp (search_path, flags, file_name,
10808 O_RDONLY | O_BINARY, &absolute_name);
10809 xfree (search_path);
10813 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name, gnutarget, desc));
10814 xfree (absolute_name);
10815 if (sym_bfd == NULL)
10817 bfd_set_cacheable (sym_bfd.get (), 1);
10819 if (!bfd_check_format (sym_bfd.get (), bfd_object))
10822 /* Success. Record the bfd as having been included by the objfile's bfd.
10823 This is important because things like demangled_names_hash lives in the
10824 objfile's per_bfd space and may have references to things like symbol
10825 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
10826 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
10831 /* Try to open DWO file FILE_NAME.
10832 COMP_DIR is the DW_AT_comp_dir attribute.
10833 The result is the bfd handle of the file.
10834 If there is a problem finding or opening the file, return NULL.
10835 Upon success, the canonicalized path of the file is stored in the bfd,
10836 same as symfile_bfd_open. */
10838 static gdb_bfd_ref_ptr
10839 open_dwo_file (const char *file_name, const char *comp_dir)
10841 if (IS_ABSOLUTE_PATH (file_name))
10842 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
10844 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
10846 if (comp_dir != NULL)
10848 char *path_to_try = concat (comp_dir, SLASH_STRING,
10849 file_name, (char *) NULL);
10851 /* NOTE: If comp_dir is a relative path, this will also try the
10852 search path, which seems useful. */
10853 gdb_bfd_ref_ptr abfd (try_open_dwop_file (path_to_try, 0 /*is_dwp*/,
10854 1 /*search_cwd*/));
10855 xfree (path_to_try);
10860 /* That didn't work, try debug-file-directory, which, despite its name,
10861 is a list of paths. */
10863 if (*debug_file_directory == '\0')
10866 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
10869 /* This function is mapped across the sections and remembers the offset and
10870 size of each of the DWO debugging sections we are interested in. */
10873 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
10875 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
10876 const struct dwop_section_names *names = &dwop_section_names;
10878 if (section_is_p (sectp->name, &names->abbrev_dwo))
10880 dwo_sections->abbrev.s.section = sectp;
10881 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
10883 else if (section_is_p (sectp->name, &names->info_dwo))
10885 dwo_sections->info.s.section = sectp;
10886 dwo_sections->info.size = bfd_get_section_size (sectp);
10888 else if (section_is_p (sectp->name, &names->line_dwo))
10890 dwo_sections->line.s.section = sectp;
10891 dwo_sections->line.size = bfd_get_section_size (sectp);
10893 else if (section_is_p (sectp->name, &names->loc_dwo))
10895 dwo_sections->loc.s.section = sectp;
10896 dwo_sections->loc.size = bfd_get_section_size (sectp);
10898 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10900 dwo_sections->macinfo.s.section = sectp;
10901 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
10903 else if (section_is_p (sectp->name, &names->macro_dwo))
10905 dwo_sections->macro.s.section = sectp;
10906 dwo_sections->macro.size = bfd_get_section_size (sectp);
10908 else if (section_is_p (sectp->name, &names->str_dwo))
10910 dwo_sections->str.s.section = sectp;
10911 dwo_sections->str.size = bfd_get_section_size (sectp);
10913 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10915 dwo_sections->str_offsets.s.section = sectp;
10916 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
10918 else if (section_is_p (sectp->name, &names->types_dwo))
10920 struct dwarf2_section_info type_section;
10922 memset (&type_section, 0, sizeof (type_section));
10923 type_section.s.section = sectp;
10924 type_section.size = bfd_get_section_size (sectp);
10925 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
10930 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
10931 by PER_CU. This is for the non-DWP case.
10932 The result is NULL if DWO_NAME can't be found. */
10934 static struct dwo_file *
10935 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
10936 const char *dwo_name, const char *comp_dir)
10938 struct objfile *objfile = dwarf2_per_objfile->objfile;
10939 struct dwo_file *dwo_file;
10940 struct cleanup *cleanups;
10942 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwo_name, comp_dir));
10945 if (dwarf_read_debug)
10946 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
10949 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10950 dwo_file->dwo_name = dwo_name;
10951 dwo_file->comp_dir = comp_dir;
10952 dwo_file->dbfd = dbfd.release ();
10954 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
10956 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
10957 &dwo_file->sections);
10959 create_cus_hash_table (*dwo_file, dwo_file->sections.info, dwo_file->cus);
10961 create_debug_types_hash_table (dwo_file, dwo_file->sections.types,
10964 discard_cleanups (cleanups);
10966 if (dwarf_read_debug)
10967 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
10972 /* This function is mapped across the sections and remembers the offset and
10973 size of each of the DWP debugging sections common to version 1 and 2 that
10974 we are interested in. */
10977 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
10978 void *dwp_file_ptr)
10980 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
10981 const struct dwop_section_names *names = &dwop_section_names;
10982 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10984 /* Record the ELF section number for later lookup: this is what the
10985 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10986 gdb_assert (elf_section_nr < dwp_file->num_sections);
10987 dwp_file->elf_sections[elf_section_nr] = sectp;
10989 /* Look for specific sections that we need. */
10990 if (section_is_p (sectp->name, &names->str_dwo))
10992 dwp_file->sections.str.s.section = sectp;
10993 dwp_file->sections.str.size = bfd_get_section_size (sectp);
10995 else if (section_is_p (sectp->name, &names->cu_index))
10997 dwp_file->sections.cu_index.s.section = sectp;
10998 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
11000 else if (section_is_p (sectp->name, &names->tu_index))
11002 dwp_file->sections.tu_index.s.section = sectp;
11003 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
11007 /* This function is mapped across the sections and remembers the offset and
11008 size of each of the DWP version 2 debugging sections that we are interested
11009 in. This is split into a separate function because we don't know if we
11010 have version 1 or 2 until we parse the cu_index/tu_index sections. */
11013 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
11015 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
11016 const struct dwop_section_names *names = &dwop_section_names;
11017 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
11019 /* Record the ELF section number for later lookup: this is what the
11020 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
11021 gdb_assert (elf_section_nr < dwp_file->num_sections);
11022 dwp_file->elf_sections[elf_section_nr] = sectp;
11024 /* Look for specific sections that we need. */
11025 if (section_is_p (sectp->name, &names->abbrev_dwo))
11027 dwp_file->sections.abbrev.s.section = sectp;
11028 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
11030 else if (section_is_p (sectp->name, &names->info_dwo))
11032 dwp_file->sections.info.s.section = sectp;
11033 dwp_file->sections.info.size = bfd_get_section_size (sectp);
11035 else if (section_is_p (sectp->name, &names->line_dwo))
11037 dwp_file->sections.line.s.section = sectp;
11038 dwp_file->sections.line.size = bfd_get_section_size (sectp);
11040 else if (section_is_p (sectp->name, &names->loc_dwo))
11042 dwp_file->sections.loc.s.section = sectp;
11043 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
11045 else if (section_is_p (sectp->name, &names->macinfo_dwo))
11047 dwp_file->sections.macinfo.s.section = sectp;
11048 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
11050 else if (section_is_p (sectp->name, &names->macro_dwo))
11052 dwp_file->sections.macro.s.section = sectp;
11053 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
11055 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
11057 dwp_file->sections.str_offsets.s.section = sectp;
11058 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
11060 else if (section_is_p (sectp->name, &names->types_dwo))
11062 dwp_file->sections.types.s.section = sectp;
11063 dwp_file->sections.types.size = bfd_get_section_size (sectp);
11067 /* Hash function for dwp_file loaded CUs/TUs. */
11070 hash_dwp_loaded_cutus (const void *item)
11072 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11074 /* This drops the top 32 bits of the signature, but is ok for a hash. */
11075 return dwo_unit->signature;
11078 /* Equality function for dwp_file loaded CUs/TUs. */
11081 eq_dwp_loaded_cutus (const void *a, const void *b)
11083 const struct dwo_unit *dua = (const struct dwo_unit *) a;
11084 const struct dwo_unit *dub = (const struct dwo_unit *) b;
11086 return dua->signature == dub->signature;
11089 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
11092 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
11094 return htab_create_alloc_ex (3,
11095 hash_dwp_loaded_cutus,
11096 eq_dwp_loaded_cutus,
11098 &objfile->objfile_obstack,
11099 hashtab_obstack_allocate,
11100 dummy_obstack_deallocate);
11103 /* Try to open DWP file FILE_NAME.
11104 The result is the bfd handle of the file.
11105 If there is a problem finding or opening the file, return NULL.
11106 Upon success, the canonicalized path of the file is stored in the bfd,
11107 same as symfile_bfd_open. */
11109 static gdb_bfd_ref_ptr
11110 open_dwp_file (const char *file_name)
11112 gdb_bfd_ref_ptr abfd (try_open_dwop_file (file_name, 1 /*is_dwp*/,
11113 1 /*search_cwd*/));
11117 /* Work around upstream bug 15652.
11118 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
11119 [Whether that's a "bug" is debatable, but it is getting in our way.]
11120 We have no real idea where the dwp file is, because gdb's realpath-ing
11121 of the executable's path may have discarded the needed info.
11122 [IWBN if the dwp file name was recorded in the executable, akin to
11123 .gnu_debuglink, but that doesn't exist yet.]
11124 Strip the directory from FILE_NAME and search again. */
11125 if (*debug_file_directory != '\0')
11127 /* Don't implicitly search the current directory here.
11128 If the user wants to search "." to handle this case,
11129 it must be added to debug-file-directory. */
11130 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
11137 /* Initialize the use of the DWP file for the current objfile.
11138 By convention the name of the DWP file is ${objfile}.dwp.
11139 The result is NULL if it can't be found. */
11141 static struct dwp_file *
11142 open_and_init_dwp_file (void)
11144 struct objfile *objfile = dwarf2_per_objfile->objfile;
11145 struct dwp_file *dwp_file;
11147 /* Try to find first .dwp for the binary file before any symbolic links
11150 /* If the objfile is a debug file, find the name of the real binary
11151 file and get the name of dwp file from there. */
11152 std::string dwp_name;
11153 if (objfile->separate_debug_objfile_backlink != NULL)
11155 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
11156 const char *backlink_basename = lbasename (backlink->original_name);
11158 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
11161 dwp_name = objfile->original_name;
11163 dwp_name += ".dwp";
11165 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwp_name.c_str ()));
11167 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
11169 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
11170 dwp_name = objfile_name (objfile);
11171 dwp_name += ".dwp";
11172 dbfd = open_dwp_file (dwp_name.c_str ());
11177 if (dwarf_read_debug)
11178 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
11181 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
11182 dwp_file->name = bfd_get_filename (dbfd.get ());
11183 dwp_file->dbfd = dbfd.release ();
11185 /* +1: section 0 is unused */
11186 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
11187 dwp_file->elf_sections =
11188 OBSTACK_CALLOC (&objfile->objfile_obstack,
11189 dwp_file->num_sections, asection *);
11191 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
11194 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
11196 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
11198 /* The DWP file version is stored in the hash table. Oh well. */
11199 if (dwp_file->cus->version != dwp_file->tus->version)
11201 /* Technically speaking, we should try to limp along, but this is
11202 pretty bizarre. We use pulongest here because that's the established
11203 portability solution (e.g, we cannot use %u for uint32_t). */
11204 error (_("Dwarf Error: DWP file CU version %s doesn't match"
11205 " TU version %s [in DWP file %s]"),
11206 pulongest (dwp_file->cus->version),
11207 pulongest (dwp_file->tus->version), dwp_name.c_str ());
11209 dwp_file->version = dwp_file->cus->version;
11211 if (dwp_file->version == 2)
11212 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
11215 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
11216 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
11218 if (dwarf_read_debug)
11220 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
11221 fprintf_unfiltered (gdb_stdlog,
11222 " %s CUs, %s TUs\n",
11223 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
11224 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
11230 /* Wrapper around open_and_init_dwp_file, only open it once. */
11232 static struct dwp_file *
11233 get_dwp_file (void)
11235 if (! dwarf2_per_objfile->dwp_checked)
11237 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
11238 dwarf2_per_objfile->dwp_checked = 1;
11240 return dwarf2_per_objfile->dwp_file;
11243 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
11244 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
11245 or in the DWP file for the objfile, referenced by THIS_UNIT.
11246 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
11247 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
11249 This is called, for example, when wanting to read a variable with a
11250 complex location. Therefore we don't want to do file i/o for every call.
11251 Therefore we don't want to look for a DWO file on every call.
11252 Therefore we first see if we've already seen SIGNATURE in a DWP file,
11253 then we check if we've already seen DWO_NAME, and only THEN do we check
11256 The result is a pointer to the dwo_unit object or NULL if we didn't find it
11257 (dwo_id mismatch or couldn't find the DWO/DWP file). */
11259 static struct dwo_unit *
11260 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
11261 const char *dwo_name, const char *comp_dir,
11262 ULONGEST signature, int is_debug_types)
11264 struct objfile *objfile = dwarf2_per_objfile->objfile;
11265 const char *kind = is_debug_types ? "TU" : "CU";
11266 void **dwo_file_slot;
11267 struct dwo_file *dwo_file;
11268 struct dwp_file *dwp_file;
11270 /* First see if there's a DWP file.
11271 If we have a DWP file but didn't find the DWO inside it, don't
11272 look for the original DWO file. It makes gdb behave differently
11273 depending on whether one is debugging in the build tree. */
11275 dwp_file = get_dwp_file ();
11276 if (dwp_file != NULL)
11278 const struct dwp_hash_table *dwp_htab =
11279 is_debug_types ? dwp_file->tus : dwp_file->cus;
11281 if (dwp_htab != NULL)
11283 struct dwo_unit *dwo_cutu =
11284 lookup_dwo_unit_in_dwp (dwp_file, comp_dir,
11285 signature, is_debug_types);
11287 if (dwo_cutu != NULL)
11289 if (dwarf_read_debug)
11291 fprintf_unfiltered (gdb_stdlog,
11292 "Virtual DWO %s %s found: @%s\n",
11293 kind, hex_string (signature),
11294 host_address_to_string (dwo_cutu));
11302 /* No DWP file, look for the DWO file. */
11304 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
11305 if (*dwo_file_slot == NULL)
11307 /* Read in the file and build a table of the CUs/TUs it contains. */
11308 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
11310 /* NOTE: This will be NULL if unable to open the file. */
11311 dwo_file = (struct dwo_file *) *dwo_file_slot;
11313 if (dwo_file != NULL)
11315 struct dwo_unit *dwo_cutu = NULL;
11317 if (is_debug_types && dwo_file->tus)
11319 struct dwo_unit find_dwo_cutu;
11321 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11322 find_dwo_cutu.signature = signature;
11324 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
11326 else if (!is_debug_types && dwo_file->cus)
11328 struct dwo_unit find_dwo_cutu;
11330 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11331 find_dwo_cutu.signature = signature;
11332 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
11336 if (dwo_cutu != NULL)
11338 if (dwarf_read_debug)
11340 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
11341 kind, dwo_name, hex_string (signature),
11342 host_address_to_string (dwo_cutu));
11349 /* We didn't find it. This could mean a dwo_id mismatch, or
11350 someone deleted the DWO/DWP file, or the search path isn't set up
11351 correctly to find the file. */
11353 if (dwarf_read_debug)
11355 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
11356 kind, dwo_name, hex_string (signature));
11359 /* This is a warning and not a complaint because it can be caused by
11360 pilot error (e.g., user accidentally deleting the DWO). */
11362 /* Print the name of the DWP file if we looked there, helps the user
11363 better diagnose the problem. */
11364 char *dwp_text = NULL;
11365 struct cleanup *cleanups;
11367 if (dwp_file != NULL)
11368 dwp_text = xstrprintf (" [in DWP file %s]", lbasename (dwp_file->name));
11369 cleanups = make_cleanup (xfree, dwp_text);
11371 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
11372 " [in module %s]"),
11373 kind, dwo_name, hex_string (signature),
11374 dwp_text != NULL ? dwp_text : "",
11375 this_unit->is_debug_types ? "TU" : "CU",
11376 to_underlying (this_unit->sect_off), objfile_name (objfile));
11378 do_cleanups (cleanups);
11383 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
11384 See lookup_dwo_cutu_unit for details. */
11386 static struct dwo_unit *
11387 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
11388 const char *dwo_name, const char *comp_dir,
11389 ULONGEST signature)
11391 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
11394 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
11395 See lookup_dwo_cutu_unit for details. */
11397 static struct dwo_unit *
11398 lookup_dwo_type_unit (struct signatured_type *this_tu,
11399 const char *dwo_name, const char *comp_dir)
11401 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
11404 /* Traversal function for queue_and_load_all_dwo_tus. */
11407 queue_and_load_dwo_tu (void **slot, void *info)
11409 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
11410 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
11411 ULONGEST signature = dwo_unit->signature;
11412 struct signatured_type *sig_type =
11413 lookup_dwo_signatured_type (per_cu->cu, signature);
11415 if (sig_type != NULL)
11417 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
11419 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
11420 a real dependency of PER_CU on SIG_TYPE. That is detected later
11421 while processing PER_CU. */
11422 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
11423 load_full_type_unit (sig_cu);
11424 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
11430 /* Queue all TUs contained in the DWO of PER_CU to be read in.
11431 The DWO may have the only definition of the type, though it may not be
11432 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
11433 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
11436 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
11438 struct dwo_unit *dwo_unit;
11439 struct dwo_file *dwo_file;
11441 gdb_assert (!per_cu->is_debug_types);
11442 gdb_assert (get_dwp_file () == NULL);
11443 gdb_assert (per_cu->cu != NULL);
11445 dwo_unit = per_cu->cu->dwo_unit;
11446 gdb_assert (dwo_unit != NULL);
11448 dwo_file = dwo_unit->dwo_file;
11449 if (dwo_file->tus != NULL)
11450 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
11453 /* Free all resources associated with DWO_FILE.
11454 Close the DWO file and munmap the sections.
11455 All memory should be on the objfile obstack. */
11458 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
11461 /* Note: dbfd is NULL for virtual DWO files. */
11462 gdb_bfd_unref (dwo_file->dbfd);
11464 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
11467 /* Wrapper for free_dwo_file for use in cleanups. */
11470 free_dwo_file_cleanup (void *arg)
11472 struct dwo_file *dwo_file = (struct dwo_file *) arg;
11473 struct objfile *objfile = dwarf2_per_objfile->objfile;
11475 free_dwo_file (dwo_file, objfile);
11478 /* Traversal function for free_dwo_files. */
11481 free_dwo_file_from_slot (void **slot, void *info)
11483 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
11484 struct objfile *objfile = (struct objfile *) info;
11486 free_dwo_file (dwo_file, objfile);
11491 /* Free all resources associated with DWO_FILES. */
11494 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
11496 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
11499 /* Read in various DIEs. */
11501 /* qsort helper for inherit_abstract_dies. */
11504 unsigned_int_compar (const void *ap, const void *bp)
11506 unsigned int a = *(unsigned int *) ap;
11507 unsigned int b = *(unsigned int *) bp;
11509 return (a > b) - (b > a);
11512 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
11513 Inherit only the children of the DW_AT_abstract_origin DIE not being
11514 already referenced by DW_AT_abstract_origin from the children of the
11518 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
11520 struct die_info *child_die;
11521 unsigned die_children_count;
11522 /* CU offsets which were referenced by children of the current DIE. */
11523 sect_offset *offsets;
11524 sect_offset *offsets_end, *offsetp;
11525 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
11526 struct die_info *origin_die;
11527 /* Iterator of the ORIGIN_DIE children. */
11528 struct die_info *origin_child_die;
11529 struct cleanup *cleanups;
11530 struct attribute *attr;
11531 struct dwarf2_cu *origin_cu;
11532 struct pending **origin_previous_list_in_scope;
11534 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
11538 /* Note that following die references may follow to a die in a
11542 origin_die = follow_die_ref (die, attr, &origin_cu);
11544 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
11546 origin_previous_list_in_scope = origin_cu->list_in_scope;
11547 origin_cu->list_in_scope = cu->list_in_scope;
11549 if (die->tag != origin_die->tag
11550 && !(die->tag == DW_TAG_inlined_subroutine
11551 && origin_die->tag == DW_TAG_subprogram))
11552 complaint (&symfile_complaints,
11553 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
11554 to_underlying (die->sect_off),
11555 to_underlying (origin_die->sect_off));
11557 child_die = die->child;
11558 die_children_count = 0;
11559 while (child_die && child_die->tag)
11561 child_die = sibling_die (child_die);
11562 die_children_count++;
11564 offsets = XNEWVEC (sect_offset, die_children_count);
11565 cleanups = make_cleanup (xfree, offsets);
11567 offsets_end = offsets;
11568 for (child_die = die->child;
11569 child_die && child_die->tag;
11570 child_die = sibling_die (child_die))
11572 struct die_info *child_origin_die;
11573 struct dwarf2_cu *child_origin_cu;
11575 /* We are trying to process concrete instance entries:
11576 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
11577 it's not relevant to our analysis here. i.e. detecting DIEs that are
11578 present in the abstract instance but not referenced in the concrete
11580 if (child_die->tag == DW_TAG_call_site
11581 || child_die->tag == DW_TAG_GNU_call_site)
11584 /* For each CHILD_DIE, find the corresponding child of
11585 ORIGIN_DIE. If there is more than one layer of
11586 DW_AT_abstract_origin, follow them all; there shouldn't be,
11587 but GCC versions at least through 4.4 generate this (GCC PR
11589 child_origin_die = child_die;
11590 child_origin_cu = cu;
11593 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
11597 child_origin_die = follow_die_ref (child_origin_die, attr,
11601 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
11602 counterpart may exist. */
11603 if (child_origin_die != child_die)
11605 if (child_die->tag != child_origin_die->tag
11606 && !(child_die->tag == DW_TAG_inlined_subroutine
11607 && child_origin_die->tag == DW_TAG_subprogram))
11608 complaint (&symfile_complaints,
11609 _("Child DIE 0x%x and its abstract origin 0x%x have "
11611 to_underlying (child_die->sect_off),
11612 to_underlying (child_origin_die->sect_off));
11613 if (child_origin_die->parent != origin_die)
11614 complaint (&symfile_complaints,
11615 _("Child DIE 0x%x and its abstract origin 0x%x have "
11616 "different parents"),
11617 to_underlying (child_die->sect_off),
11618 to_underlying (child_origin_die->sect_off));
11620 *offsets_end++ = child_origin_die->sect_off;
11623 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
11624 unsigned_int_compar);
11625 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
11626 if (offsetp[-1] == *offsetp)
11627 complaint (&symfile_complaints,
11628 _("Multiple children of DIE 0x%x refer "
11629 "to DIE 0x%x as their abstract origin"),
11630 to_underlying (die->sect_off), to_underlying (*offsetp));
11633 origin_child_die = origin_die->child;
11634 while (origin_child_die && origin_child_die->tag)
11636 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
11637 while (offsetp < offsets_end
11638 && *offsetp < origin_child_die->sect_off)
11640 if (offsetp >= offsets_end
11641 || *offsetp > origin_child_die->sect_off)
11643 /* Found that ORIGIN_CHILD_DIE is really not referenced.
11644 Check whether we're already processing ORIGIN_CHILD_DIE.
11645 This can happen with mutually referenced abstract_origins.
11647 if (!origin_child_die->in_process)
11648 process_die (origin_child_die, origin_cu);
11650 origin_child_die = sibling_die (origin_child_die);
11652 origin_cu->list_in_scope = origin_previous_list_in_scope;
11654 do_cleanups (cleanups);
11658 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
11660 struct objfile *objfile = cu->objfile;
11661 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11662 struct context_stack *newobj;
11665 struct die_info *child_die;
11666 struct attribute *attr, *call_line, *call_file;
11668 CORE_ADDR baseaddr;
11669 struct block *block;
11670 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
11671 VEC (symbolp) *template_args = NULL;
11672 struct template_symbol *templ_func = NULL;
11676 /* If we do not have call site information, we can't show the
11677 caller of this inlined function. That's too confusing, so
11678 only use the scope for local variables. */
11679 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
11680 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
11681 if (call_line == NULL || call_file == NULL)
11683 read_lexical_block_scope (die, cu);
11688 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11690 name = dwarf2_name (die, cu);
11692 /* Ignore functions with missing or empty names. These are actually
11693 illegal according to the DWARF standard. */
11696 complaint (&symfile_complaints,
11697 _("missing name for subprogram DIE at %d"),
11698 to_underlying (die->sect_off));
11702 /* Ignore functions with missing or invalid low and high pc attributes. */
11703 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
11704 <= PC_BOUNDS_INVALID)
11706 attr = dwarf2_attr (die, DW_AT_external, cu);
11707 if (!attr || !DW_UNSND (attr))
11708 complaint (&symfile_complaints,
11709 _("cannot get low and high bounds "
11710 "for subprogram DIE at %d"),
11711 to_underlying (die->sect_off));
11715 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11716 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11718 /* If we have any template arguments, then we must allocate a
11719 different sort of symbol. */
11720 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
11722 if (child_die->tag == DW_TAG_template_type_param
11723 || child_die->tag == DW_TAG_template_value_param)
11725 templ_func = allocate_template_symbol (objfile);
11726 templ_func->base.is_cplus_template_function = 1;
11731 newobj = push_context (0, lowpc);
11732 newobj->name = new_symbol_full (die, read_type_die (die, cu), cu,
11733 (struct symbol *) templ_func);
11735 /* If there is a location expression for DW_AT_frame_base, record
11737 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
11739 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
11741 /* If there is a location for the static link, record it. */
11742 newobj->static_link = NULL;
11743 attr = dwarf2_attr (die, DW_AT_static_link, cu);
11746 newobj->static_link
11747 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
11748 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
11751 cu->list_in_scope = &local_symbols;
11753 if (die->child != NULL)
11755 child_die = die->child;
11756 while (child_die && child_die->tag)
11758 if (child_die->tag == DW_TAG_template_type_param
11759 || child_die->tag == DW_TAG_template_value_param)
11761 struct symbol *arg = new_symbol (child_die, NULL, cu);
11764 VEC_safe_push (symbolp, template_args, arg);
11767 process_die (child_die, cu);
11768 child_die = sibling_die (child_die);
11772 inherit_abstract_dies (die, cu);
11774 /* If we have a DW_AT_specification, we might need to import using
11775 directives from the context of the specification DIE. See the
11776 comment in determine_prefix. */
11777 if (cu->language == language_cplus
11778 && dwarf2_attr (die, DW_AT_specification, cu))
11780 struct dwarf2_cu *spec_cu = cu;
11781 struct die_info *spec_die = die_specification (die, &spec_cu);
11785 child_die = spec_die->child;
11786 while (child_die && child_die->tag)
11788 if (child_die->tag == DW_TAG_imported_module)
11789 process_die (child_die, spec_cu);
11790 child_die = sibling_die (child_die);
11793 /* In some cases, GCC generates specification DIEs that
11794 themselves contain DW_AT_specification attributes. */
11795 spec_die = die_specification (spec_die, &spec_cu);
11799 newobj = pop_context ();
11800 /* Make a block for the local symbols within. */
11801 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
11802 newobj->static_link, lowpc, highpc);
11804 /* For C++, set the block's scope. */
11805 if ((cu->language == language_cplus
11806 || cu->language == language_fortran
11807 || cu->language == language_d
11808 || cu->language == language_rust)
11809 && cu->processing_has_namespace_info)
11810 block_set_scope (block, determine_prefix (die, cu),
11811 &objfile->objfile_obstack);
11813 /* If we have address ranges, record them. */
11814 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11816 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
11818 /* Attach template arguments to function. */
11819 if (! VEC_empty (symbolp, template_args))
11821 gdb_assert (templ_func != NULL);
11823 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
11824 templ_func->template_arguments
11825 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
11826 templ_func->n_template_arguments);
11827 memcpy (templ_func->template_arguments,
11828 VEC_address (symbolp, template_args),
11829 (templ_func->n_template_arguments * sizeof (struct symbol *)));
11830 VEC_free (symbolp, template_args);
11833 /* In C++, we can have functions nested inside functions (e.g., when
11834 a function declares a class that has methods). This means that
11835 when we finish processing a function scope, we may need to go
11836 back to building a containing block's symbol lists. */
11837 local_symbols = newobj->locals;
11838 local_using_directives = newobj->local_using_directives;
11840 /* If we've finished processing a top-level function, subsequent
11841 symbols go in the file symbol list. */
11842 if (outermost_context_p ())
11843 cu->list_in_scope = &file_symbols;
11846 /* Process all the DIES contained within a lexical block scope. Start
11847 a new scope, process the dies, and then close the scope. */
11850 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
11852 struct objfile *objfile = cu->objfile;
11853 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11854 struct context_stack *newobj;
11855 CORE_ADDR lowpc, highpc;
11856 struct die_info *child_die;
11857 CORE_ADDR baseaddr;
11859 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11861 /* Ignore blocks with missing or invalid low and high pc attributes. */
11862 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
11863 as multiple lexical blocks? Handling children in a sane way would
11864 be nasty. Might be easier to properly extend generic blocks to
11865 describe ranges. */
11866 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
11868 case PC_BOUNDS_NOT_PRESENT:
11869 /* DW_TAG_lexical_block has no attributes, process its children as if
11870 there was no wrapping by that DW_TAG_lexical_block.
11871 GCC does no longer produces such DWARF since GCC r224161. */
11872 for (child_die = die->child;
11873 child_die != NULL && child_die->tag;
11874 child_die = sibling_die (child_die))
11875 process_die (child_die, cu);
11877 case PC_BOUNDS_INVALID:
11880 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11881 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11883 push_context (0, lowpc);
11884 if (die->child != NULL)
11886 child_die = die->child;
11887 while (child_die && child_die->tag)
11889 process_die (child_die, cu);
11890 child_die = sibling_die (child_die);
11893 inherit_abstract_dies (die, cu);
11894 newobj = pop_context ();
11896 if (local_symbols != NULL || local_using_directives != NULL)
11898 struct block *block
11899 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
11900 newobj->start_addr, highpc);
11902 /* Note that recording ranges after traversing children, as we
11903 do here, means that recording a parent's ranges entails
11904 walking across all its children's ranges as they appear in
11905 the address map, which is quadratic behavior.
11907 It would be nicer to record the parent's ranges before
11908 traversing its children, simply overriding whatever you find
11909 there. But since we don't even decide whether to create a
11910 block until after we've traversed its children, that's hard
11912 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11914 local_symbols = newobj->locals;
11915 local_using_directives = newobj->local_using_directives;
11918 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
11921 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
11923 struct objfile *objfile = cu->objfile;
11924 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11925 CORE_ADDR pc, baseaddr;
11926 struct attribute *attr;
11927 struct call_site *call_site, call_site_local;
11930 struct die_info *child_die;
11932 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11934 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
11937 /* This was a pre-DWARF-5 GNU extension alias
11938 for DW_AT_call_return_pc. */
11939 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11943 complaint (&symfile_complaints,
11944 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
11945 "DIE 0x%x [in module %s]"),
11946 to_underlying (die->sect_off), objfile_name (objfile));
11949 pc = attr_value_as_address (attr) + baseaddr;
11950 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
11952 if (cu->call_site_htab == NULL)
11953 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
11954 NULL, &objfile->objfile_obstack,
11955 hashtab_obstack_allocate, NULL);
11956 call_site_local.pc = pc;
11957 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
11960 complaint (&symfile_complaints,
11961 _("Duplicate PC %s for DW_TAG_call_site "
11962 "DIE 0x%x [in module %s]"),
11963 paddress (gdbarch, pc), to_underlying (die->sect_off),
11964 objfile_name (objfile));
11968 /* Count parameters at the caller. */
11971 for (child_die = die->child; child_die && child_die->tag;
11972 child_die = sibling_die (child_die))
11974 if (child_die->tag != DW_TAG_call_site_parameter
11975 && child_die->tag != DW_TAG_GNU_call_site_parameter)
11977 complaint (&symfile_complaints,
11978 _("Tag %d is not DW_TAG_call_site_parameter in "
11979 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
11980 child_die->tag, to_underlying (child_die->sect_off),
11981 objfile_name (objfile));
11989 = ((struct call_site *)
11990 obstack_alloc (&objfile->objfile_obstack,
11991 sizeof (*call_site)
11992 + (sizeof (*call_site->parameter) * (nparams - 1))));
11994 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
11995 call_site->pc = pc;
11997 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
11998 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
12000 struct die_info *func_die;
12002 /* Skip also over DW_TAG_inlined_subroutine. */
12003 for (func_die = die->parent;
12004 func_die && func_die->tag != DW_TAG_subprogram
12005 && func_die->tag != DW_TAG_subroutine_type;
12006 func_die = func_die->parent);
12008 /* DW_AT_call_all_calls is a superset
12009 of DW_AT_call_all_tail_calls. */
12011 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
12012 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
12013 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
12014 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
12016 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
12017 not complete. But keep CALL_SITE for look ups via call_site_htab,
12018 both the initial caller containing the real return address PC and
12019 the final callee containing the current PC of a chain of tail
12020 calls do not need to have the tail call list complete. But any
12021 function candidate for a virtual tail call frame searched via
12022 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
12023 determined unambiguously. */
12027 struct type *func_type = NULL;
12030 func_type = get_die_type (func_die, cu);
12031 if (func_type != NULL)
12033 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
12035 /* Enlist this call site to the function. */
12036 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
12037 TYPE_TAIL_CALL_LIST (func_type) = call_site;
12040 complaint (&symfile_complaints,
12041 _("Cannot find function owning DW_TAG_call_site "
12042 "DIE 0x%x [in module %s]"),
12043 to_underlying (die->sect_off), objfile_name (objfile));
12047 attr = dwarf2_attr (die, DW_AT_call_target, cu);
12049 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
12051 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
12054 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
12055 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
12057 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
12058 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
12059 /* Keep NULL DWARF_BLOCK. */;
12060 else if (attr_form_is_block (attr))
12062 struct dwarf2_locexpr_baton *dlbaton;
12064 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
12065 dlbaton->data = DW_BLOCK (attr)->data;
12066 dlbaton->size = DW_BLOCK (attr)->size;
12067 dlbaton->per_cu = cu->per_cu;
12069 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
12071 else if (attr_form_is_ref (attr))
12073 struct dwarf2_cu *target_cu = cu;
12074 struct die_info *target_die;
12076 target_die = follow_die_ref (die, attr, &target_cu);
12077 gdb_assert (target_cu->objfile == objfile);
12078 if (die_is_declaration (target_die, target_cu))
12080 const char *target_physname;
12082 /* Prefer the mangled name; otherwise compute the demangled one. */
12083 target_physname = dw2_linkage_name (target_die, target_cu);
12084 if (target_physname == NULL)
12085 target_physname = dwarf2_physname (NULL, target_die, target_cu);
12086 if (target_physname == NULL)
12087 complaint (&symfile_complaints,
12088 _("DW_AT_call_target target DIE has invalid "
12089 "physname, for referencing DIE 0x%x [in module %s]"),
12090 to_underlying (die->sect_off), objfile_name (objfile));
12092 SET_FIELD_PHYSNAME (call_site->target, target_physname);
12098 /* DW_AT_entry_pc should be preferred. */
12099 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
12100 <= PC_BOUNDS_INVALID)
12101 complaint (&symfile_complaints,
12102 _("DW_AT_call_target target DIE has invalid "
12103 "low pc, for referencing DIE 0x%x [in module %s]"),
12104 to_underlying (die->sect_off), objfile_name (objfile));
12107 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
12108 SET_FIELD_PHYSADDR (call_site->target, lowpc);
12113 complaint (&symfile_complaints,
12114 _("DW_TAG_call_site DW_AT_call_target is neither "
12115 "block nor reference, for DIE 0x%x [in module %s]"),
12116 to_underlying (die->sect_off), objfile_name (objfile));
12118 call_site->per_cu = cu->per_cu;
12120 for (child_die = die->child;
12121 child_die && child_die->tag;
12122 child_die = sibling_die (child_die))
12124 struct call_site_parameter *parameter;
12125 struct attribute *loc, *origin;
12127 if (child_die->tag != DW_TAG_call_site_parameter
12128 && child_die->tag != DW_TAG_GNU_call_site_parameter)
12130 /* Already printed the complaint above. */
12134 gdb_assert (call_site->parameter_count < nparams);
12135 parameter = &call_site->parameter[call_site->parameter_count];
12137 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
12138 specifies DW_TAG_formal_parameter. Value of the data assumed for the
12139 register is contained in DW_AT_call_value. */
12141 loc = dwarf2_attr (child_die, DW_AT_location, cu);
12142 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
12143 if (origin == NULL)
12145 /* This was a pre-DWARF-5 GNU extension alias
12146 for DW_AT_call_parameter. */
12147 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
12149 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
12151 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
12153 sect_offset sect_off
12154 = (sect_offset) dwarf2_get_ref_die_offset (origin);
12155 if (!offset_in_cu_p (&cu->header, sect_off))
12157 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
12158 binding can be done only inside one CU. Such referenced DIE
12159 therefore cannot be even moved to DW_TAG_partial_unit. */
12160 complaint (&symfile_complaints,
12161 _("DW_AT_call_parameter offset is not in CU for "
12162 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12163 to_underlying (child_die->sect_off),
12164 objfile_name (objfile));
12167 parameter->u.param_cu_off
12168 = (cu_offset) (sect_off - cu->header.sect_off);
12170 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
12172 complaint (&symfile_complaints,
12173 _("No DW_FORM_block* DW_AT_location for "
12174 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12175 to_underlying (child_die->sect_off), objfile_name (objfile));
12180 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
12181 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
12182 if (parameter->u.dwarf_reg != -1)
12183 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
12184 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
12185 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
12186 ¶meter->u.fb_offset))
12187 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
12190 complaint (&symfile_complaints,
12191 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
12192 "for DW_FORM_block* DW_AT_location is supported for "
12193 "DW_TAG_call_site child DIE 0x%x "
12195 to_underlying (child_die->sect_off),
12196 objfile_name (objfile));
12201 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
12203 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
12204 if (!attr_form_is_block (attr))
12206 complaint (&symfile_complaints,
12207 _("No DW_FORM_block* DW_AT_call_value for "
12208 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12209 to_underlying (child_die->sect_off),
12210 objfile_name (objfile));
12213 parameter->value = DW_BLOCK (attr)->data;
12214 parameter->value_size = DW_BLOCK (attr)->size;
12216 /* Parameters are not pre-cleared by memset above. */
12217 parameter->data_value = NULL;
12218 parameter->data_value_size = 0;
12219 call_site->parameter_count++;
12221 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
12223 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
12226 if (!attr_form_is_block (attr))
12227 complaint (&symfile_complaints,
12228 _("No DW_FORM_block* DW_AT_call_data_value for "
12229 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12230 to_underlying (child_die->sect_off),
12231 objfile_name (objfile));
12234 parameter->data_value = DW_BLOCK (attr)->data;
12235 parameter->data_value_size = DW_BLOCK (attr)->size;
12241 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
12242 reading .debug_rnglists.
12243 Callback's type should be:
12244 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
12245 Return true if the attributes are present and valid, otherwise,
12248 template <typename Callback>
12250 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
12251 Callback &&callback)
12253 struct objfile *objfile = cu->objfile;
12254 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12255 struct comp_unit_head *cu_header = &cu->header;
12256 bfd *obfd = objfile->obfd;
12257 unsigned int addr_size = cu_header->addr_size;
12258 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12259 /* Base address selection entry. */
12262 unsigned int dummy;
12263 const gdb_byte *buffer;
12265 CORE_ADDR high = 0;
12266 CORE_ADDR baseaddr;
12267 bool overflow = false;
12269 found_base = cu->base_known;
12270 base = cu->base_address;
12272 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
12273 if (offset >= dwarf2_per_objfile->rnglists.size)
12275 complaint (&symfile_complaints,
12276 _("Offset %d out of bounds for DW_AT_ranges attribute"),
12280 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
12282 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12286 /* Initialize it due to a false compiler warning. */
12287 CORE_ADDR range_beginning = 0, range_end = 0;
12288 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
12289 + dwarf2_per_objfile->rnglists.size);
12290 unsigned int bytes_read;
12292 if (buffer == buf_end)
12297 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
12300 case DW_RLE_end_of_list:
12302 case DW_RLE_base_address:
12303 if (buffer + cu->header.addr_size > buf_end)
12308 base = read_address (obfd, buffer, cu, &bytes_read);
12310 buffer += bytes_read;
12312 case DW_RLE_start_length:
12313 if (buffer + cu->header.addr_size > buf_end)
12318 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12319 buffer += bytes_read;
12320 range_end = (range_beginning
12321 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
12322 buffer += bytes_read;
12323 if (buffer > buf_end)
12329 case DW_RLE_offset_pair:
12330 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12331 buffer += bytes_read;
12332 if (buffer > buf_end)
12337 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12338 buffer += bytes_read;
12339 if (buffer > buf_end)
12345 case DW_RLE_start_end:
12346 if (buffer + 2 * cu->header.addr_size > buf_end)
12351 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12352 buffer += bytes_read;
12353 range_end = read_address (obfd, buffer, cu, &bytes_read);
12354 buffer += bytes_read;
12357 complaint (&symfile_complaints,
12358 _("Invalid .debug_rnglists data (no base address)"));
12361 if (rlet == DW_RLE_end_of_list || overflow)
12363 if (rlet == DW_RLE_base_address)
12368 /* We have no valid base address for the ranges
12370 complaint (&symfile_complaints,
12371 _("Invalid .debug_rnglists data (no base address)"));
12375 if (range_beginning > range_end)
12377 /* Inverted range entries are invalid. */
12378 complaint (&symfile_complaints,
12379 _("Invalid .debug_rnglists data (inverted range)"));
12383 /* Empty range entries have no effect. */
12384 if (range_beginning == range_end)
12387 range_beginning += base;
12390 /* A not-uncommon case of bad debug info.
12391 Don't pollute the addrmap with bad data. */
12392 if (range_beginning + baseaddr == 0
12393 && !dwarf2_per_objfile->has_section_at_zero)
12395 complaint (&symfile_complaints,
12396 _(".debug_rnglists entry has start address of zero"
12397 " [in module %s]"), objfile_name (objfile));
12401 callback (range_beginning, range_end);
12406 complaint (&symfile_complaints,
12407 _("Offset %d is not terminated "
12408 "for DW_AT_ranges attribute"),
12416 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
12417 Callback's type should be:
12418 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
12419 Return 1 if the attributes are present and valid, otherwise, return 0. */
12421 template <typename Callback>
12423 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
12424 Callback &&callback)
12426 struct objfile *objfile = cu->objfile;
12427 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12428 struct comp_unit_head *cu_header = &cu->header;
12429 bfd *obfd = objfile->obfd;
12430 unsigned int addr_size = cu_header->addr_size;
12431 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12432 /* Base address selection entry. */
12435 unsigned int dummy;
12436 const gdb_byte *buffer;
12437 CORE_ADDR baseaddr;
12439 if (cu_header->version >= 5)
12440 return dwarf2_rnglists_process (offset, cu, callback);
12442 found_base = cu->base_known;
12443 base = cu->base_address;
12445 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
12446 if (offset >= dwarf2_per_objfile->ranges.size)
12448 complaint (&symfile_complaints,
12449 _("Offset %d out of bounds for DW_AT_ranges attribute"),
12453 buffer = dwarf2_per_objfile->ranges.buffer + offset;
12455 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12459 CORE_ADDR range_beginning, range_end;
12461 range_beginning = read_address (obfd, buffer, cu, &dummy);
12462 buffer += addr_size;
12463 range_end = read_address (obfd, buffer, cu, &dummy);
12464 buffer += addr_size;
12465 offset += 2 * addr_size;
12467 /* An end of list marker is a pair of zero addresses. */
12468 if (range_beginning == 0 && range_end == 0)
12469 /* Found the end of list entry. */
12472 /* Each base address selection entry is a pair of 2 values.
12473 The first is the largest possible address, the second is
12474 the base address. Check for a base address here. */
12475 if ((range_beginning & mask) == mask)
12477 /* If we found the largest possible address, then we already
12478 have the base address in range_end. */
12486 /* We have no valid base address for the ranges
12488 complaint (&symfile_complaints,
12489 _("Invalid .debug_ranges data (no base address)"));
12493 if (range_beginning > range_end)
12495 /* Inverted range entries are invalid. */
12496 complaint (&symfile_complaints,
12497 _("Invalid .debug_ranges data (inverted range)"));
12501 /* Empty range entries have no effect. */
12502 if (range_beginning == range_end)
12505 range_beginning += base;
12508 /* A not-uncommon case of bad debug info.
12509 Don't pollute the addrmap with bad data. */
12510 if (range_beginning + baseaddr == 0
12511 && !dwarf2_per_objfile->has_section_at_zero)
12513 complaint (&symfile_complaints,
12514 _(".debug_ranges entry has start address of zero"
12515 " [in module %s]"), objfile_name (objfile));
12519 callback (range_beginning, range_end);
12525 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
12526 Return 1 if the attributes are present and valid, otherwise, return 0.
12527 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
12530 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
12531 CORE_ADDR *high_return, struct dwarf2_cu *cu,
12532 struct partial_symtab *ranges_pst)
12534 struct objfile *objfile = cu->objfile;
12535 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12536 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
12537 SECT_OFF_TEXT (objfile));
12540 CORE_ADDR high = 0;
12543 retval = dwarf2_ranges_process (offset, cu,
12544 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
12546 if (ranges_pst != NULL)
12551 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12552 range_beginning + baseaddr);
12553 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12554 range_end + baseaddr);
12555 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
12559 /* FIXME: This is recording everything as a low-high
12560 segment of consecutive addresses. We should have a
12561 data structure for discontiguous block ranges
12565 low = range_beginning;
12571 if (range_beginning < low)
12572 low = range_beginning;
12573 if (range_end > high)
12581 /* If the first entry is an end-of-list marker, the range
12582 describes an empty scope, i.e. no instructions. */
12588 *high_return = high;
12592 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
12593 definition for the return value. *LOWPC and *HIGHPC are set iff
12594 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
12596 static enum pc_bounds_kind
12597 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
12598 CORE_ADDR *highpc, struct dwarf2_cu *cu,
12599 struct partial_symtab *pst)
12601 struct attribute *attr;
12602 struct attribute *attr_high;
12604 CORE_ADDR high = 0;
12605 enum pc_bounds_kind ret;
12607 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12610 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12613 low = attr_value_as_address (attr);
12614 high = attr_value_as_address (attr_high);
12615 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12619 /* Found high w/o low attribute. */
12620 return PC_BOUNDS_INVALID;
12622 /* Found consecutive range of addresses. */
12623 ret = PC_BOUNDS_HIGH_LOW;
12627 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12630 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12631 We take advantage of the fact that DW_AT_ranges does not appear
12632 in DW_TAG_compile_unit of DWO files. */
12633 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12634 unsigned int ranges_offset = (DW_UNSND (attr)
12635 + (need_ranges_base
12639 /* Value of the DW_AT_ranges attribute is the offset in the
12640 .debug_ranges section. */
12641 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
12642 return PC_BOUNDS_INVALID;
12643 /* Found discontinuous range of addresses. */
12644 ret = PC_BOUNDS_RANGES;
12647 return PC_BOUNDS_NOT_PRESENT;
12650 /* read_partial_die has also the strict LOW < HIGH requirement. */
12652 return PC_BOUNDS_INVALID;
12654 /* When using the GNU linker, .gnu.linkonce. sections are used to
12655 eliminate duplicate copies of functions and vtables and such.
12656 The linker will arbitrarily choose one and discard the others.
12657 The AT_*_pc values for such functions refer to local labels in
12658 these sections. If the section from that file was discarded, the
12659 labels are not in the output, so the relocs get a value of 0.
12660 If this is a discarded function, mark the pc bounds as invalid,
12661 so that GDB will ignore it. */
12662 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
12663 return PC_BOUNDS_INVALID;
12671 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
12672 its low and high PC addresses. Do nothing if these addresses could not
12673 be determined. Otherwise, set LOWPC to the low address if it is smaller,
12674 and HIGHPC to the high address if greater than HIGHPC. */
12677 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
12678 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12679 struct dwarf2_cu *cu)
12681 CORE_ADDR low, high;
12682 struct die_info *child = die->child;
12684 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
12686 *lowpc = std::min (*lowpc, low);
12687 *highpc = std::max (*highpc, high);
12690 /* If the language does not allow nested subprograms (either inside
12691 subprograms or lexical blocks), we're done. */
12692 if (cu->language != language_ada)
12695 /* Check all the children of the given DIE. If it contains nested
12696 subprograms, then check their pc bounds. Likewise, we need to
12697 check lexical blocks as well, as they may also contain subprogram
12699 while (child && child->tag)
12701 if (child->tag == DW_TAG_subprogram
12702 || child->tag == DW_TAG_lexical_block)
12703 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
12704 child = sibling_die (child);
12708 /* Get the low and high pc's represented by the scope DIE, and store
12709 them in *LOWPC and *HIGHPC. If the correct values can't be
12710 determined, set *LOWPC to -1 and *HIGHPC to 0. */
12713 get_scope_pc_bounds (struct die_info *die,
12714 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12715 struct dwarf2_cu *cu)
12717 CORE_ADDR best_low = (CORE_ADDR) -1;
12718 CORE_ADDR best_high = (CORE_ADDR) 0;
12719 CORE_ADDR current_low, current_high;
12721 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
12722 >= PC_BOUNDS_RANGES)
12724 best_low = current_low;
12725 best_high = current_high;
12729 struct die_info *child = die->child;
12731 while (child && child->tag)
12733 switch (child->tag) {
12734 case DW_TAG_subprogram:
12735 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
12737 case DW_TAG_namespace:
12738 case DW_TAG_module:
12739 /* FIXME: carlton/2004-01-16: Should we do this for
12740 DW_TAG_class_type/DW_TAG_structure_type, too? I think
12741 that current GCC's always emit the DIEs corresponding
12742 to definitions of methods of classes as children of a
12743 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
12744 the DIEs giving the declarations, which could be
12745 anywhere). But I don't see any reason why the
12746 standards says that they have to be there. */
12747 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
12749 if (current_low != ((CORE_ADDR) -1))
12751 best_low = std::min (best_low, current_low);
12752 best_high = std::max (best_high, current_high);
12760 child = sibling_die (child);
12765 *highpc = best_high;
12768 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
12772 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
12773 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
12775 struct objfile *objfile = cu->objfile;
12776 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12777 struct attribute *attr;
12778 struct attribute *attr_high;
12780 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12783 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12786 CORE_ADDR low = attr_value_as_address (attr);
12787 CORE_ADDR high = attr_value_as_address (attr_high);
12789 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12792 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
12793 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
12794 record_block_range (block, low, high - 1);
12798 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12801 bfd *obfd = objfile->obfd;
12802 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12803 We take advantage of the fact that DW_AT_ranges does not appear
12804 in DW_TAG_compile_unit of DWO files. */
12805 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12807 /* The value of the DW_AT_ranges attribute is the offset of the
12808 address range list in the .debug_ranges section. */
12809 unsigned long offset = (DW_UNSND (attr)
12810 + (need_ranges_base ? cu->ranges_base : 0));
12811 const gdb_byte *buffer;
12813 /* For some target architectures, but not others, the
12814 read_address function sign-extends the addresses it returns.
12815 To recognize base address selection entries, we need a
12817 unsigned int addr_size = cu->header.addr_size;
12818 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12820 /* The base address, to which the next pair is relative. Note
12821 that this 'base' is a DWARF concept: most entries in a range
12822 list are relative, to reduce the number of relocs against the
12823 debugging information. This is separate from this function's
12824 'baseaddr' argument, which GDB uses to relocate debugging
12825 information from a shared library based on the address at
12826 which the library was loaded. */
12827 CORE_ADDR base = cu->base_address;
12828 int base_known = cu->base_known;
12830 dwarf2_ranges_process (offset, cu,
12831 [&] (CORE_ADDR start, CORE_ADDR end)
12835 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
12836 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
12837 record_block_range (block, start, end - 1);
12842 /* Check whether the producer field indicates either of GCC < 4.6, or the
12843 Intel C/C++ compiler, and cache the result in CU. */
12846 check_producer (struct dwarf2_cu *cu)
12850 if (cu->producer == NULL)
12852 /* For unknown compilers expect their behavior is DWARF version
12855 GCC started to support .debug_types sections by -gdwarf-4 since
12856 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
12857 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
12858 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
12859 interpreted incorrectly by GDB now - GCC PR debug/48229. */
12861 else if (producer_is_gcc (cu->producer, &major, &minor))
12863 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
12864 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
12866 else if (startswith (cu->producer, "Intel(R) C"))
12867 cu->producer_is_icc = 1;
12870 /* For other non-GCC compilers, expect their behavior is DWARF version
12874 cu->checked_producer = 1;
12877 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
12878 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
12879 during 4.6.0 experimental. */
12882 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
12884 if (!cu->checked_producer)
12885 check_producer (cu);
12887 return cu->producer_is_gxx_lt_4_6;
12890 /* Return the default accessibility type if it is not overriden by
12891 DW_AT_accessibility. */
12893 static enum dwarf_access_attribute
12894 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
12896 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
12898 /* The default DWARF 2 accessibility for members is public, the default
12899 accessibility for inheritance is private. */
12901 if (die->tag != DW_TAG_inheritance)
12902 return DW_ACCESS_public;
12904 return DW_ACCESS_private;
12908 /* DWARF 3+ defines the default accessibility a different way. The same
12909 rules apply now for DW_TAG_inheritance as for the members and it only
12910 depends on the container kind. */
12912 if (die->parent->tag == DW_TAG_class_type)
12913 return DW_ACCESS_private;
12915 return DW_ACCESS_public;
12919 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
12920 offset. If the attribute was not found return 0, otherwise return
12921 1. If it was found but could not properly be handled, set *OFFSET
12925 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
12928 struct attribute *attr;
12930 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
12935 /* Note that we do not check for a section offset first here.
12936 This is because DW_AT_data_member_location is new in DWARF 4,
12937 so if we see it, we can assume that a constant form is really
12938 a constant and not a section offset. */
12939 if (attr_form_is_constant (attr))
12940 *offset = dwarf2_get_attr_constant_value (attr, 0);
12941 else if (attr_form_is_section_offset (attr))
12942 dwarf2_complex_location_expr_complaint ();
12943 else if (attr_form_is_block (attr))
12944 *offset = decode_locdesc (DW_BLOCK (attr), cu);
12946 dwarf2_complex_location_expr_complaint ();
12954 /* Add an aggregate field to the field list. */
12957 dwarf2_add_field (struct field_info *fip, struct die_info *die,
12958 struct dwarf2_cu *cu)
12960 struct objfile *objfile = cu->objfile;
12961 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12962 struct nextfield *new_field;
12963 struct attribute *attr;
12965 const char *fieldname = "";
12967 /* Allocate a new field list entry and link it in. */
12968 new_field = XNEW (struct nextfield);
12969 make_cleanup (xfree, new_field);
12970 memset (new_field, 0, sizeof (struct nextfield));
12972 if (die->tag == DW_TAG_inheritance)
12974 new_field->next = fip->baseclasses;
12975 fip->baseclasses = new_field;
12979 new_field->next = fip->fields;
12980 fip->fields = new_field;
12984 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
12986 new_field->accessibility = DW_UNSND (attr);
12988 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
12989 if (new_field->accessibility != DW_ACCESS_public)
12990 fip->non_public_fields = 1;
12992 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
12994 new_field->virtuality = DW_UNSND (attr);
12996 new_field->virtuality = DW_VIRTUALITY_none;
12998 fp = &new_field->field;
13000 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
13004 /* Data member other than a C++ static data member. */
13006 /* Get type of field. */
13007 fp->type = die_type (die, cu);
13009 SET_FIELD_BITPOS (*fp, 0);
13011 /* Get bit size of field (zero if none). */
13012 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
13015 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
13019 FIELD_BITSIZE (*fp) = 0;
13022 /* Get bit offset of field. */
13023 if (handle_data_member_location (die, cu, &offset))
13024 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
13025 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
13028 if (gdbarch_bits_big_endian (gdbarch))
13030 /* For big endian bits, the DW_AT_bit_offset gives the
13031 additional bit offset from the MSB of the containing
13032 anonymous object to the MSB of the field. We don't
13033 have to do anything special since we don't need to
13034 know the size of the anonymous object. */
13035 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
13039 /* For little endian bits, compute the bit offset to the
13040 MSB of the anonymous object, subtract off the number of
13041 bits from the MSB of the field to the MSB of the
13042 object, and then subtract off the number of bits of
13043 the field itself. The result is the bit offset of
13044 the LSB of the field. */
13045 int anonymous_size;
13046 int bit_offset = DW_UNSND (attr);
13048 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13051 /* The size of the anonymous object containing
13052 the bit field is explicit, so use the
13053 indicated size (in bytes). */
13054 anonymous_size = DW_UNSND (attr);
13058 /* The size of the anonymous object containing
13059 the bit field must be inferred from the type
13060 attribute of the data member containing the
13062 anonymous_size = TYPE_LENGTH (fp->type);
13064 SET_FIELD_BITPOS (*fp,
13065 (FIELD_BITPOS (*fp)
13066 + anonymous_size * bits_per_byte
13067 - bit_offset - FIELD_BITSIZE (*fp)));
13070 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
13072 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
13073 + dwarf2_get_attr_constant_value (attr, 0)));
13075 /* Get name of field. */
13076 fieldname = dwarf2_name (die, cu);
13077 if (fieldname == NULL)
13080 /* The name is already allocated along with this objfile, so we don't
13081 need to duplicate it for the type. */
13082 fp->name = fieldname;
13084 /* Change accessibility for artificial fields (e.g. virtual table
13085 pointer or virtual base class pointer) to private. */
13086 if (dwarf2_attr (die, DW_AT_artificial, cu))
13088 FIELD_ARTIFICIAL (*fp) = 1;
13089 new_field->accessibility = DW_ACCESS_private;
13090 fip->non_public_fields = 1;
13093 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
13095 /* C++ static member. */
13097 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
13098 is a declaration, but all versions of G++ as of this writing
13099 (so through at least 3.2.1) incorrectly generate
13100 DW_TAG_variable tags. */
13102 const char *physname;
13104 /* Get name of field. */
13105 fieldname = dwarf2_name (die, cu);
13106 if (fieldname == NULL)
13109 attr = dwarf2_attr (die, DW_AT_const_value, cu);
13111 /* Only create a symbol if this is an external value.
13112 new_symbol checks this and puts the value in the global symbol
13113 table, which we want. If it is not external, new_symbol
13114 will try to put the value in cu->list_in_scope which is wrong. */
13115 && dwarf2_flag_true_p (die, DW_AT_external, cu))
13117 /* A static const member, not much different than an enum as far as
13118 we're concerned, except that we can support more types. */
13119 new_symbol (die, NULL, cu);
13122 /* Get physical name. */
13123 physname = dwarf2_physname (fieldname, die, cu);
13125 /* The name is already allocated along with this objfile, so we don't
13126 need to duplicate it for the type. */
13127 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
13128 FIELD_TYPE (*fp) = die_type (die, cu);
13129 FIELD_NAME (*fp) = fieldname;
13131 else if (die->tag == DW_TAG_inheritance)
13135 /* C++ base class field. */
13136 if (handle_data_member_location (die, cu, &offset))
13137 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
13138 FIELD_BITSIZE (*fp) = 0;
13139 FIELD_TYPE (*fp) = die_type (die, cu);
13140 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
13141 fip->nbaseclasses++;
13145 /* Add a typedef defined in the scope of the FIP's class. */
13148 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
13149 struct dwarf2_cu *cu)
13151 struct typedef_field_list *new_field;
13152 struct typedef_field *fp;
13154 /* Allocate a new field list entry and link it in. */
13155 new_field = XCNEW (struct typedef_field_list);
13156 make_cleanup (xfree, new_field);
13158 gdb_assert (die->tag == DW_TAG_typedef);
13160 fp = &new_field->field;
13162 /* Get name of field. */
13163 fp->name = dwarf2_name (die, cu);
13164 if (fp->name == NULL)
13167 fp->type = read_type_die (die, cu);
13169 new_field->next = fip->typedef_field_list;
13170 fip->typedef_field_list = new_field;
13171 fip->typedef_field_list_count++;
13174 /* Create the vector of fields, and attach it to the type. */
13177 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
13178 struct dwarf2_cu *cu)
13180 int nfields = fip->nfields;
13182 /* Record the field count, allocate space for the array of fields,
13183 and create blank accessibility bitfields if necessary. */
13184 TYPE_NFIELDS (type) = nfields;
13185 TYPE_FIELDS (type) = (struct field *)
13186 TYPE_ALLOC (type, sizeof (struct field) * nfields);
13187 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
13189 if (fip->non_public_fields && cu->language != language_ada)
13191 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13193 TYPE_FIELD_PRIVATE_BITS (type) =
13194 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13195 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
13197 TYPE_FIELD_PROTECTED_BITS (type) =
13198 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13199 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
13201 TYPE_FIELD_IGNORE_BITS (type) =
13202 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13203 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
13206 /* If the type has baseclasses, allocate and clear a bit vector for
13207 TYPE_FIELD_VIRTUAL_BITS. */
13208 if (fip->nbaseclasses && cu->language != language_ada)
13210 int num_bytes = B_BYTES (fip->nbaseclasses);
13211 unsigned char *pointer;
13213 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13214 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
13215 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
13216 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
13217 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
13220 /* Copy the saved-up fields into the field vector. Start from the head of
13221 the list, adding to the tail of the field array, so that they end up in
13222 the same order in the array in which they were added to the list. */
13223 while (nfields-- > 0)
13225 struct nextfield *fieldp;
13229 fieldp = fip->fields;
13230 fip->fields = fieldp->next;
13234 fieldp = fip->baseclasses;
13235 fip->baseclasses = fieldp->next;
13238 TYPE_FIELD (type, nfields) = fieldp->field;
13239 switch (fieldp->accessibility)
13241 case DW_ACCESS_private:
13242 if (cu->language != language_ada)
13243 SET_TYPE_FIELD_PRIVATE (type, nfields);
13246 case DW_ACCESS_protected:
13247 if (cu->language != language_ada)
13248 SET_TYPE_FIELD_PROTECTED (type, nfields);
13251 case DW_ACCESS_public:
13255 /* Unknown accessibility. Complain and treat it as public. */
13257 complaint (&symfile_complaints, _("unsupported accessibility %d"),
13258 fieldp->accessibility);
13262 if (nfields < fip->nbaseclasses)
13264 switch (fieldp->virtuality)
13266 case DW_VIRTUALITY_virtual:
13267 case DW_VIRTUALITY_pure_virtual:
13268 if (cu->language == language_ada)
13269 error (_("unexpected virtuality in component of Ada type"));
13270 SET_TYPE_FIELD_VIRTUAL (type, nfields);
13277 /* Return true if this member function is a constructor, false
13281 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
13283 const char *fieldname;
13284 const char *type_name;
13287 if (die->parent == NULL)
13290 if (die->parent->tag != DW_TAG_structure_type
13291 && die->parent->tag != DW_TAG_union_type
13292 && die->parent->tag != DW_TAG_class_type)
13295 fieldname = dwarf2_name (die, cu);
13296 type_name = dwarf2_name (die->parent, cu);
13297 if (fieldname == NULL || type_name == NULL)
13300 len = strlen (fieldname);
13301 return (strncmp (fieldname, type_name, len) == 0
13302 && (type_name[len] == '\0' || type_name[len] == '<'));
13305 /* Add a member function to the proper fieldlist. */
13308 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
13309 struct type *type, struct dwarf2_cu *cu)
13311 struct objfile *objfile = cu->objfile;
13312 struct attribute *attr;
13313 struct fnfieldlist *flp;
13315 struct fn_field *fnp;
13316 const char *fieldname;
13317 struct nextfnfield *new_fnfield;
13318 struct type *this_type;
13319 enum dwarf_access_attribute accessibility;
13321 if (cu->language == language_ada)
13322 error (_("unexpected member function in Ada type"));
13324 /* Get name of member function. */
13325 fieldname = dwarf2_name (die, cu);
13326 if (fieldname == NULL)
13329 /* Look up member function name in fieldlist. */
13330 for (i = 0; i < fip->nfnfields; i++)
13332 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
13336 /* Create new list element if necessary. */
13337 if (i < fip->nfnfields)
13338 flp = &fip->fnfieldlists[i];
13341 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
13343 fip->fnfieldlists = (struct fnfieldlist *)
13344 xrealloc (fip->fnfieldlists,
13345 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
13346 * sizeof (struct fnfieldlist));
13347 if (fip->nfnfields == 0)
13348 make_cleanup (free_current_contents, &fip->fnfieldlists);
13350 flp = &fip->fnfieldlists[fip->nfnfields];
13351 flp->name = fieldname;
13354 i = fip->nfnfields++;
13357 /* Create a new member function field and chain it to the field list
13359 new_fnfield = XNEW (struct nextfnfield);
13360 make_cleanup (xfree, new_fnfield);
13361 memset (new_fnfield, 0, sizeof (struct nextfnfield));
13362 new_fnfield->next = flp->head;
13363 flp->head = new_fnfield;
13366 /* Fill in the member function field info. */
13367 fnp = &new_fnfield->fnfield;
13369 /* Delay processing of the physname until later. */
13370 if (cu->language == language_cplus)
13372 add_to_method_list (type, i, flp->length - 1, fieldname,
13377 const char *physname = dwarf2_physname (fieldname, die, cu);
13378 fnp->physname = physname ? physname : "";
13381 fnp->type = alloc_type (objfile);
13382 this_type = read_type_die (die, cu);
13383 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
13385 int nparams = TYPE_NFIELDS (this_type);
13387 /* TYPE is the domain of this method, and THIS_TYPE is the type
13388 of the method itself (TYPE_CODE_METHOD). */
13389 smash_to_method_type (fnp->type, type,
13390 TYPE_TARGET_TYPE (this_type),
13391 TYPE_FIELDS (this_type),
13392 TYPE_NFIELDS (this_type),
13393 TYPE_VARARGS (this_type));
13395 /* Handle static member functions.
13396 Dwarf2 has no clean way to discern C++ static and non-static
13397 member functions. G++ helps GDB by marking the first
13398 parameter for non-static member functions (which is the this
13399 pointer) as artificial. We obtain this information from
13400 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
13401 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
13402 fnp->voffset = VOFFSET_STATIC;
13405 complaint (&symfile_complaints, _("member function type missing for '%s'"),
13406 dwarf2_full_name (fieldname, die, cu));
13408 /* Get fcontext from DW_AT_containing_type if present. */
13409 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13410 fnp->fcontext = die_containing_type (die, cu);
13412 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
13413 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
13415 /* Get accessibility. */
13416 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
13418 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
13420 accessibility = dwarf2_default_access_attribute (die, cu);
13421 switch (accessibility)
13423 case DW_ACCESS_private:
13424 fnp->is_private = 1;
13426 case DW_ACCESS_protected:
13427 fnp->is_protected = 1;
13431 /* Check for artificial methods. */
13432 attr = dwarf2_attr (die, DW_AT_artificial, cu);
13433 if (attr && DW_UNSND (attr) != 0)
13434 fnp->is_artificial = 1;
13436 fnp->is_constructor = dwarf2_is_constructor (die, cu);
13438 /* Get index in virtual function table if it is a virtual member
13439 function. For older versions of GCC, this is an offset in the
13440 appropriate virtual table, as specified by DW_AT_containing_type.
13441 For everyone else, it is an expression to be evaluated relative
13442 to the object address. */
13444 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
13447 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
13449 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
13451 /* Old-style GCC. */
13452 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
13454 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
13455 || (DW_BLOCK (attr)->size > 1
13456 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
13457 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
13459 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
13460 if ((fnp->voffset % cu->header.addr_size) != 0)
13461 dwarf2_complex_location_expr_complaint ();
13463 fnp->voffset /= cu->header.addr_size;
13467 dwarf2_complex_location_expr_complaint ();
13469 if (!fnp->fcontext)
13471 /* If there is no `this' field and no DW_AT_containing_type,
13472 we cannot actually find a base class context for the
13474 if (TYPE_NFIELDS (this_type) == 0
13475 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
13477 complaint (&symfile_complaints,
13478 _("cannot determine context for virtual member "
13479 "function \"%s\" (offset %d)"),
13480 fieldname, to_underlying (die->sect_off));
13485 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
13489 else if (attr_form_is_section_offset (attr))
13491 dwarf2_complex_location_expr_complaint ();
13495 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
13501 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
13502 if (attr && DW_UNSND (attr))
13504 /* GCC does this, as of 2008-08-25; PR debug/37237. */
13505 complaint (&symfile_complaints,
13506 _("Member function \"%s\" (offset %d) is virtual "
13507 "but the vtable offset is not specified"),
13508 fieldname, to_underlying (die->sect_off));
13509 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13510 TYPE_CPLUS_DYNAMIC (type) = 1;
13515 /* Create the vector of member function fields, and attach it to the type. */
13518 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
13519 struct dwarf2_cu *cu)
13521 struct fnfieldlist *flp;
13524 if (cu->language == language_ada)
13525 error (_("unexpected member functions in Ada type"));
13527 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13528 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
13529 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
13531 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
13533 struct nextfnfield *nfp = flp->head;
13534 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
13537 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
13538 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
13539 fn_flp->fn_fields = (struct fn_field *)
13540 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
13541 for (k = flp->length; (k--, nfp); nfp = nfp->next)
13542 fn_flp->fn_fields[k] = nfp->fnfield;
13545 TYPE_NFN_FIELDS (type) = fip->nfnfields;
13548 /* Returns non-zero if NAME is the name of a vtable member in CU's
13549 language, zero otherwise. */
13551 is_vtable_name (const char *name, struct dwarf2_cu *cu)
13553 static const char vptr[] = "_vptr";
13554 static const char vtable[] = "vtable";
13556 /* Look for the C++ form of the vtable. */
13557 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
13563 /* GCC outputs unnamed structures that are really pointers to member
13564 functions, with the ABI-specified layout. If TYPE describes
13565 such a structure, smash it into a member function type.
13567 GCC shouldn't do this; it should just output pointer to member DIEs.
13568 This is GCC PR debug/28767. */
13571 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
13573 struct type *pfn_type, *self_type, *new_type;
13575 /* Check for a structure with no name and two children. */
13576 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
13579 /* Check for __pfn and __delta members. */
13580 if (TYPE_FIELD_NAME (type, 0) == NULL
13581 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
13582 || TYPE_FIELD_NAME (type, 1) == NULL
13583 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
13586 /* Find the type of the method. */
13587 pfn_type = TYPE_FIELD_TYPE (type, 0);
13588 if (pfn_type == NULL
13589 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
13590 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
13593 /* Look for the "this" argument. */
13594 pfn_type = TYPE_TARGET_TYPE (pfn_type);
13595 if (TYPE_NFIELDS (pfn_type) == 0
13596 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
13597 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
13600 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
13601 new_type = alloc_type (objfile);
13602 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
13603 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
13604 TYPE_VARARGS (pfn_type));
13605 smash_to_methodptr_type (type, new_type);
13608 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
13612 producer_is_icc (struct dwarf2_cu *cu)
13614 if (!cu->checked_producer)
13615 check_producer (cu);
13617 return cu->producer_is_icc;
13620 /* Called when we find the DIE that starts a structure or union scope
13621 (definition) to create a type for the structure or union. Fill in
13622 the type's name and general properties; the members will not be
13623 processed until process_structure_scope. A symbol table entry for
13624 the type will also not be done until process_structure_scope (assuming
13625 the type has a name).
13627 NOTE: we need to call these functions regardless of whether or not the
13628 DIE has a DW_AT_name attribute, since it might be an anonymous
13629 structure or union. This gets the type entered into our set of
13630 user defined types. */
13632 static struct type *
13633 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
13635 struct objfile *objfile = cu->objfile;
13637 struct attribute *attr;
13640 /* If the definition of this type lives in .debug_types, read that type.
13641 Don't follow DW_AT_specification though, that will take us back up
13642 the chain and we want to go down. */
13643 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13646 type = get_DW_AT_signature_type (die, attr, cu);
13648 /* The type's CU may not be the same as CU.
13649 Ensure TYPE is recorded with CU in die_type_hash. */
13650 return set_die_type (die, type, cu);
13653 type = alloc_type (objfile);
13654 INIT_CPLUS_SPECIFIC (type);
13656 name = dwarf2_name (die, cu);
13659 if (cu->language == language_cplus
13660 || cu->language == language_d
13661 || cu->language == language_rust)
13663 const char *full_name = dwarf2_full_name (name, die, cu);
13665 /* dwarf2_full_name might have already finished building the DIE's
13666 type. If so, there is no need to continue. */
13667 if (get_die_type (die, cu) != NULL)
13668 return get_die_type (die, cu);
13670 TYPE_TAG_NAME (type) = full_name;
13671 if (die->tag == DW_TAG_structure_type
13672 || die->tag == DW_TAG_class_type)
13673 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13677 /* The name is already allocated along with this objfile, so
13678 we don't need to duplicate it for the type. */
13679 TYPE_TAG_NAME (type) = name;
13680 if (die->tag == DW_TAG_class_type)
13681 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13685 if (die->tag == DW_TAG_structure_type)
13687 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13689 else if (die->tag == DW_TAG_union_type)
13691 TYPE_CODE (type) = TYPE_CODE_UNION;
13695 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13698 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
13699 TYPE_DECLARED_CLASS (type) = 1;
13701 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13704 if (attr_form_is_constant (attr))
13705 TYPE_LENGTH (type) = DW_UNSND (attr);
13708 /* For the moment, dynamic type sizes are not supported
13709 by GDB's struct type. The actual size is determined
13710 on-demand when resolving the type of a given object,
13711 so set the type's length to zero for now. Otherwise,
13712 we record an expression as the length, and that expression
13713 could lead to a very large value, which could eventually
13714 lead to us trying to allocate that much memory when creating
13715 a value of that type. */
13716 TYPE_LENGTH (type) = 0;
13721 TYPE_LENGTH (type) = 0;
13724 if (producer_is_icc (cu) && (TYPE_LENGTH (type) == 0))
13726 /* ICC does not output the required DW_AT_declaration
13727 on incomplete types, but gives them a size of zero. */
13728 TYPE_STUB (type) = 1;
13731 TYPE_STUB_SUPPORTED (type) = 1;
13733 if (die_is_declaration (die, cu))
13734 TYPE_STUB (type) = 1;
13735 else if (attr == NULL && die->child == NULL
13736 && producer_is_realview (cu->producer))
13737 /* RealView does not output the required DW_AT_declaration
13738 on incomplete types. */
13739 TYPE_STUB (type) = 1;
13741 /* We need to add the type field to the die immediately so we don't
13742 infinitely recurse when dealing with pointers to the structure
13743 type within the structure itself. */
13744 set_die_type (die, type, cu);
13746 /* set_die_type should be already done. */
13747 set_descriptive_type (type, die, cu);
13752 /* Finish creating a structure or union type, including filling in
13753 its members and creating a symbol for it. */
13756 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
13758 struct objfile *objfile = cu->objfile;
13759 struct die_info *child_die;
13762 type = get_die_type (die, cu);
13764 type = read_structure_type (die, cu);
13766 if (die->child != NULL && ! die_is_declaration (die, cu))
13768 struct field_info fi;
13769 VEC (symbolp) *template_args = NULL;
13770 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
13772 memset (&fi, 0, sizeof (struct field_info));
13774 child_die = die->child;
13776 while (child_die && child_die->tag)
13778 if (child_die->tag == DW_TAG_member
13779 || child_die->tag == DW_TAG_variable)
13781 /* NOTE: carlton/2002-11-05: A C++ static data member
13782 should be a DW_TAG_member that is a declaration, but
13783 all versions of G++ as of this writing (so through at
13784 least 3.2.1) incorrectly generate DW_TAG_variable
13785 tags for them instead. */
13786 dwarf2_add_field (&fi, child_die, cu);
13788 else if (child_die->tag == DW_TAG_subprogram)
13790 /* Rust doesn't have member functions in the C++ sense.
13791 However, it does emit ordinary functions as children
13792 of a struct DIE. */
13793 if (cu->language == language_rust)
13794 read_func_scope (child_die, cu);
13797 /* C++ member function. */
13798 dwarf2_add_member_fn (&fi, child_die, type, cu);
13801 else if (child_die->tag == DW_TAG_inheritance)
13803 /* C++ base class field. */
13804 dwarf2_add_field (&fi, child_die, cu);
13806 else if (child_die->tag == DW_TAG_typedef)
13807 dwarf2_add_typedef (&fi, child_die, cu);
13808 else if (child_die->tag == DW_TAG_template_type_param
13809 || child_die->tag == DW_TAG_template_value_param)
13811 struct symbol *arg = new_symbol (child_die, NULL, cu);
13814 VEC_safe_push (symbolp, template_args, arg);
13817 child_die = sibling_die (child_die);
13820 /* Attach template arguments to type. */
13821 if (! VEC_empty (symbolp, template_args))
13823 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13824 TYPE_N_TEMPLATE_ARGUMENTS (type)
13825 = VEC_length (symbolp, template_args);
13826 TYPE_TEMPLATE_ARGUMENTS (type)
13827 = XOBNEWVEC (&objfile->objfile_obstack,
13829 TYPE_N_TEMPLATE_ARGUMENTS (type));
13830 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
13831 VEC_address (symbolp, template_args),
13832 (TYPE_N_TEMPLATE_ARGUMENTS (type)
13833 * sizeof (struct symbol *)));
13834 VEC_free (symbolp, template_args);
13837 /* Attach fields and member functions to the type. */
13839 dwarf2_attach_fields_to_type (&fi, type, cu);
13842 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
13844 /* Get the type which refers to the base class (possibly this
13845 class itself) which contains the vtable pointer for the current
13846 class from the DW_AT_containing_type attribute. This use of
13847 DW_AT_containing_type is a GNU extension. */
13849 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13851 struct type *t = die_containing_type (die, cu);
13853 set_type_vptr_basetype (type, t);
13858 /* Our own class provides vtbl ptr. */
13859 for (i = TYPE_NFIELDS (t) - 1;
13860 i >= TYPE_N_BASECLASSES (t);
13863 const char *fieldname = TYPE_FIELD_NAME (t, i);
13865 if (is_vtable_name (fieldname, cu))
13867 set_type_vptr_fieldno (type, i);
13872 /* Complain if virtual function table field not found. */
13873 if (i < TYPE_N_BASECLASSES (t))
13874 complaint (&symfile_complaints,
13875 _("virtual function table pointer "
13876 "not found when defining class '%s'"),
13877 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
13882 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
13885 else if (cu->producer
13886 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
13888 /* The IBM XLC compiler does not provide direct indication
13889 of the containing type, but the vtable pointer is
13890 always named __vfp. */
13894 for (i = TYPE_NFIELDS (type) - 1;
13895 i >= TYPE_N_BASECLASSES (type);
13898 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
13900 set_type_vptr_fieldno (type, i);
13901 set_type_vptr_basetype (type, type);
13908 /* Copy fi.typedef_field_list linked list elements content into the
13909 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
13910 if (fi.typedef_field_list)
13912 int i = fi.typedef_field_list_count;
13914 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13915 TYPE_TYPEDEF_FIELD_ARRAY (type)
13916 = ((struct typedef_field *)
13917 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
13918 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
13920 /* Reverse the list order to keep the debug info elements order. */
13923 struct typedef_field *dest, *src;
13925 dest = &TYPE_TYPEDEF_FIELD (type, i);
13926 src = &fi.typedef_field_list->field;
13927 fi.typedef_field_list = fi.typedef_field_list->next;
13932 do_cleanups (back_to);
13935 quirk_gcc_member_function_pointer (type, objfile);
13937 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
13938 snapshots) has been known to create a die giving a declaration
13939 for a class that has, as a child, a die giving a definition for a
13940 nested class. So we have to process our children even if the
13941 current die is a declaration. Normally, of course, a declaration
13942 won't have any children at all. */
13944 child_die = die->child;
13946 while (child_die != NULL && child_die->tag)
13948 if (child_die->tag == DW_TAG_member
13949 || child_die->tag == DW_TAG_variable
13950 || child_die->tag == DW_TAG_inheritance
13951 || child_die->tag == DW_TAG_template_value_param
13952 || child_die->tag == DW_TAG_template_type_param)
13957 process_die (child_die, cu);
13959 child_die = sibling_die (child_die);
13962 /* Do not consider external references. According to the DWARF standard,
13963 these DIEs are identified by the fact that they have no byte_size
13964 attribute, and a declaration attribute. */
13965 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
13966 || !die_is_declaration (die, cu))
13967 new_symbol (die, type, cu);
13970 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
13971 update TYPE using some information only available in DIE's children. */
13974 update_enumeration_type_from_children (struct die_info *die,
13976 struct dwarf2_cu *cu)
13978 struct die_info *child_die;
13979 int unsigned_enum = 1;
13983 auto_obstack obstack;
13985 for (child_die = die->child;
13986 child_die != NULL && child_die->tag;
13987 child_die = sibling_die (child_die))
13989 struct attribute *attr;
13991 const gdb_byte *bytes;
13992 struct dwarf2_locexpr_baton *baton;
13995 if (child_die->tag != DW_TAG_enumerator)
13998 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
14002 name = dwarf2_name (child_die, cu);
14004 name = "<anonymous enumerator>";
14006 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
14007 &value, &bytes, &baton);
14013 else if ((mask & value) != 0)
14018 /* If we already know that the enum type is neither unsigned, nor
14019 a flag type, no need to look at the rest of the enumerates. */
14020 if (!unsigned_enum && !flag_enum)
14025 TYPE_UNSIGNED (type) = 1;
14027 TYPE_FLAG_ENUM (type) = 1;
14030 /* Given a DW_AT_enumeration_type die, set its type. We do not
14031 complete the type's fields yet, or create any symbols. */
14033 static struct type *
14034 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
14036 struct objfile *objfile = cu->objfile;
14038 struct attribute *attr;
14041 /* If the definition of this type lives in .debug_types, read that type.
14042 Don't follow DW_AT_specification though, that will take us back up
14043 the chain and we want to go down. */
14044 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
14047 type = get_DW_AT_signature_type (die, attr, cu);
14049 /* The type's CU may not be the same as CU.
14050 Ensure TYPE is recorded with CU in die_type_hash. */
14051 return set_die_type (die, type, cu);
14054 type = alloc_type (objfile);
14056 TYPE_CODE (type) = TYPE_CODE_ENUM;
14057 name = dwarf2_full_name (NULL, die, cu);
14059 TYPE_TAG_NAME (type) = name;
14061 attr = dwarf2_attr (die, DW_AT_type, cu);
14064 struct type *underlying_type = die_type (die, cu);
14066 TYPE_TARGET_TYPE (type) = underlying_type;
14069 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14072 TYPE_LENGTH (type) = DW_UNSND (attr);
14076 TYPE_LENGTH (type) = 0;
14079 /* The enumeration DIE can be incomplete. In Ada, any type can be
14080 declared as private in the package spec, and then defined only
14081 inside the package body. Such types are known as Taft Amendment
14082 Types. When another package uses such a type, an incomplete DIE
14083 may be generated by the compiler. */
14084 if (die_is_declaration (die, cu))
14085 TYPE_STUB (type) = 1;
14087 /* Finish the creation of this type by using the enum's children.
14088 We must call this even when the underlying type has been provided
14089 so that we can determine if we're looking at a "flag" enum. */
14090 update_enumeration_type_from_children (die, type, cu);
14092 /* If this type has an underlying type that is not a stub, then we
14093 may use its attributes. We always use the "unsigned" attribute
14094 in this situation, because ordinarily we guess whether the type
14095 is unsigned -- but the guess can be wrong and the underlying type
14096 can tell us the reality. However, we defer to a local size
14097 attribute if one exists, because this lets the compiler override
14098 the underlying type if needed. */
14099 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
14101 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
14102 if (TYPE_LENGTH (type) == 0)
14103 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
14106 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
14108 return set_die_type (die, type, cu);
14111 /* Given a pointer to a die which begins an enumeration, process all
14112 the dies that define the members of the enumeration, and create the
14113 symbol for the enumeration type.
14115 NOTE: We reverse the order of the element list. */
14118 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
14120 struct type *this_type;
14122 this_type = get_die_type (die, cu);
14123 if (this_type == NULL)
14124 this_type = read_enumeration_type (die, cu);
14126 if (die->child != NULL)
14128 struct die_info *child_die;
14129 struct symbol *sym;
14130 struct field *fields = NULL;
14131 int num_fields = 0;
14134 child_die = die->child;
14135 while (child_die && child_die->tag)
14137 if (child_die->tag != DW_TAG_enumerator)
14139 process_die (child_die, cu);
14143 name = dwarf2_name (child_die, cu);
14146 sym = new_symbol (child_die, this_type, cu);
14148 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
14150 fields = (struct field *)
14152 (num_fields + DW_FIELD_ALLOC_CHUNK)
14153 * sizeof (struct field));
14156 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
14157 FIELD_TYPE (fields[num_fields]) = NULL;
14158 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
14159 FIELD_BITSIZE (fields[num_fields]) = 0;
14165 child_die = sibling_die (child_die);
14170 TYPE_NFIELDS (this_type) = num_fields;
14171 TYPE_FIELDS (this_type) = (struct field *)
14172 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
14173 memcpy (TYPE_FIELDS (this_type), fields,
14174 sizeof (struct field) * num_fields);
14179 /* If we are reading an enum from a .debug_types unit, and the enum
14180 is a declaration, and the enum is not the signatured type in the
14181 unit, then we do not want to add a symbol for it. Adding a
14182 symbol would in some cases obscure the true definition of the
14183 enum, giving users an incomplete type when the definition is
14184 actually available. Note that we do not want to do this for all
14185 enums which are just declarations, because C++0x allows forward
14186 enum declarations. */
14187 if (cu->per_cu->is_debug_types
14188 && die_is_declaration (die, cu))
14190 struct signatured_type *sig_type;
14192 sig_type = (struct signatured_type *) cu->per_cu;
14193 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
14194 if (sig_type->type_offset_in_section != die->sect_off)
14198 new_symbol (die, this_type, cu);
14201 /* Extract all information from a DW_TAG_array_type DIE and put it in
14202 the DIE's type field. For now, this only handles one dimensional
14205 static struct type *
14206 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
14208 struct objfile *objfile = cu->objfile;
14209 struct die_info *child_die;
14211 struct type *element_type, *range_type, *index_type;
14212 struct type **range_types = NULL;
14213 struct attribute *attr;
14215 struct cleanup *back_to;
14217 unsigned int bit_stride = 0;
14219 element_type = die_type (die, cu);
14221 /* The die_type call above may have already set the type for this DIE. */
14222 type = get_die_type (die, cu);
14226 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
14228 bit_stride = DW_UNSND (attr) * 8;
14230 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
14232 bit_stride = DW_UNSND (attr);
14234 /* Irix 6.2 native cc creates array types without children for
14235 arrays with unspecified length. */
14236 if (die->child == NULL)
14238 index_type = objfile_type (objfile)->builtin_int;
14239 range_type = create_static_range_type (NULL, index_type, 0, -1);
14240 type = create_array_type_with_stride (NULL, element_type, range_type,
14242 return set_die_type (die, type, cu);
14245 back_to = make_cleanup (null_cleanup, NULL);
14246 child_die = die->child;
14247 while (child_die && child_die->tag)
14249 if (child_die->tag == DW_TAG_subrange_type)
14251 struct type *child_type = read_type_die (child_die, cu);
14253 if (child_type != NULL)
14255 /* The range type was succesfully read. Save it for the
14256 array type creation. */
14257 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
14259 range_types = (struct type **)
14260 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
14261 * sizeof (struct type *));
14263 make_cleanup (free_current_contents, &range_types);
14265 range_types[ndim++] = child_type;
14268 child_die = sibling_die (child_die);
14271 /* Dwarf2 dimensions are output from left to right, create the
14272 necessary array types in backwards order. */
14274 type = element_type;
14276 if (read_array_order (die, cu) == DW_ORD_col_major)
14281 type = create_array_type_with_stride (NULL, type, range_types[i++],
14287 type = create_array_type_with_stride (NULL, type, range_types[ndim],
14291 /* Understand Dwarf2 support for vector types (like they occur on
14292 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
14293 array type. This is not part of the Dwarf2/3 standard yet, but a
14294 custom vendor extension. The main difference between a regular
14295 array and the vector variant is that vectors are passed by value
14297 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
14299 make_vector_type (type);
14301 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
14302 implementation may choose to implement triple vectors using this
14304 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14307 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
14308 TYPE_LENGTH (type) = DW_UNSND (attr);
14310 complaint (&symfile_complaints,
14311 _("DW_AT_byte_size for array type smaller "
14312 "than the total size of elements"));
14315 name = dwarf2_name (die, cu);
14317 TYPE_NAME (type) = name;
14319 /* Install the type in the die. */
14320 set_die_type (die, type, cu);
14322 /* set_die_type should be already done. */
14323 set_descriptive_type (type, die, cu);
14325 do_cleanups (back_to);
14330 static enum dwarf_array_dim_ordering
14331 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
14333 struct attribute *attr;
14335 attr = dwarf2_attr (die, DW_AT_ordering, cu);
14338 return (enum dwarf_array_dim_ordering) DW_SND (attr);
14340 /* GNU F77 is a special case, as at 08/2004 array type info is the
14341 opposite order to the dwarf2 specification, but data is still
14342 laid out as per normal fortran.
14344 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
14345 version checking. */
14347 if (cu->language == language_fortran
14348 && cu->producer && strstr (cu->producer, "GNU F77"))
14350 return DW_ORD_row_major;
14353 switch (cu->language_defn->la_array_ordering)
14355 case array_column_major:
14356 return DW_ORD_col_major;
14357 case array_row_major:
14359 return DW_ORD_row_major;
14363 /* Extract all information from a DW_TAG_set_type DIE and put it in
14364 the DIE's type field. */
14366 static struct type *
14367 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
14369 struct type *domain_type, *set_type;
14370 struct attribute *attr;
14372 domain_type = die_type (die, cu);
14374 /* The die_type call above may have already set the type for this DIE. */
14375 set_type = get_die_type (die, cu);
14379 set_type = create_set_type (NULL, domain_type);
14381 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14383 TYPE_LENGTH (set_type) = DW_UNSND (attr);
14385 return set_die_type (die, set_type, cu);
14388 /* A helper for read_common_block that creates a locexpr baton.
14389 SYM is the symbol which we are marking as computed.
14390 COMMON_DIE is the DIE for the common block.
14391 COMMON_LOC is the location expression attribute for the common
14393 MEMBER_LOC is the location expression attribute for the particular
14394 member of the common block that we are processing.
14395 CU is the CU from which the above come. */
14398 mark_common_block_symbol_computed (struct symbol *sym,
14399 struct die_info *common_die,
14400 struct attribute *common_loc,
14401 struct attribute *member_loc,
14402 struct dwarf2_cu *cu)
14404 struct objfile *objfile = dwarf2_per_objfile->objfile;
14405 struct dwarf2_locexpr_baton *baton;
14407 unsigned int cu_off;
14408 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
14409 LONGEST offset = 0;
14411 gdb_assert (common_loc && member_loc);
14412 gdb_assert (attr_form_is_block (common_loc));
14413 gdb_assert (attr_form_is_block (member_loc)
14414 || attr_form_is_constant (member_loc));
14416 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14417 baton->per_cu = cu->per_cu;
14418 gdb_assert (baton->per_cu);
14420 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
14422 if (attr_form_is_constant (member_loc))
14424 offset = dwarf2_get_attr_constant_value (member_loc, 0);
14425 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
14428 baton->size += DW_BLOCK (member_loc)->size;
14430 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
14433 *ptr++ = DW_OP_call4;
14434 cu_off = common_die->sect_off - cu->per_cu->sect_off;
14435 store_unsigned_integer (ptr, 4, byte_order, cu_off);
14438 if (attr_form_is_constant (member_loc))
14440 *ptr++ = DW_OP_addr;
14441 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
14442 ptr += cu->header.addr_size;
14446 /* We have to copy the data here, because DW_OP_call4 will only
14447 use a DW_AT_location attribute. */
14448 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
14449 ptr += DW_BLOCK (member_loc)->size;
14452 *ptr++ = DW_OP_plus;
14453 gdb_assert (ptr - baton->data == baton->size);
14455 SYMBOL_LOCATION_BATON (sym) = baton;
14456 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
14459 /* Create appropriate locally-scoped variables for all the
14460 DW_TAG_common_block entries. Also create a struct common_block
14461 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
14462 is used to sepate the common blocks name namespace from regular
14466 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
14468 struct attribute *attr;
14470 attr = dwarf2_attr (die, DW_AT_location, cu);
14473 /* Support the .debug_loc offsets. */
14474 if (attr_form_is_block (attr))
14478 else if (attr_form_is_section_offset (attr))
14480 dwarf2_complex_location_expr_complaint ();
14485 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14486 "common block member");
14491 if (die->child != NULL)
14493 struct objfile *objfile = cu->objfile;
14494 struct die_info *child_die;
14495 size_t n_entries = 0, size;
14496 struct common_block *common_block;
14497 struct symbol *sym;
14499 for (child_die = die->child;
14500 child_die && child_die->tag;
14501 child_die = sibling_die (child_die))
14504 size = (sizeof (struct common_block)
14505 + (n_entries - 1) * sizeof (struct symbol *));
14507 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
14509 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
14510 common_block->n_entries = 0;
14512 for (child_die = die->child;
14513 child_die && child_die->tag;
14514 child_die = sibling_die (child_die))
14516 /* Create the symbol in the DW_TAG_common_block block in the current
14518 sym = new_symbol (child_die, NULL, cu);
14521 struct attribute *member_loc;
14523 common_block->contents[common_block->n_entries++] = sym;
14525 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
14529 /* GDB has handled this for a long time, but it is
14530 not specified by DWARF. It seems to have been
14531 emitted by gfortran at least as recently as:
14532 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
14533 complaint (&symfile_complaints,
14534 _("Variable in common block has "
14535 "DW_AT_data_member_location "
14536 "- DIE at 0x%x [in module %s]"),
14537 to_underlying (child_die->sect_off),
14538 objfile_name (cu->objfile));
14540 if (attr_form_is_section_offset (member_loc))
14541 dwarf2_complex_location_expr_complaint ();
14542 else if (attr_form_is_constant (member_loc)
14543 || attr_form_is_block (member_loc))
14546 mark_common_block_symbol_computed (sym, die, attr,
14550 dwarf2_complex_location_expr_complaint ();
14555 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
14556 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
14560 /* Create a type for a C++ namespace. */
14562 static struct type *
14563 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
14565 struct objfile *objfile = cu->objfile;
14566 const char *previous_prefix, *name;
14570 /* For extensions, reuse the type of the original namespace. */
14571 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
14573 struct die_info *ext_die;
14574 struct dwarf2_cu *ext_cu = cu;
14576 ext_die = dwarf2_extension (die, &ext_cu);
14577 type = read_type_die (ext_die, ext_cu);
14579 /* EXT_CU may not be the same as CU.
14580 Ensure TYPE is recorded with CU in die_type_hash. */
14581 return set_die_type (die, type, cu);
14584 name = namespace_name (die, &is_anonymous, cu);
14586 /* Now build the name of the current namespace. */
14588 previous_prefix = determine_prefix (die, cu);
14589 if (previous_prefix[0] != '\0')
14590 name = typename_concat (&objfile->objfile_obstack,
14591 previous_prefix, name, 0, cu);
14593 /* Create the type. */
14594 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
14595 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14597 return set_die_type (die, type, cu);
14600 /* Read a namespace scope. */
14603 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
14605 struct objfile *objfile = cu->objfile;
14608 /* Add a symbol associated to this if we haven't seen the namespace
14609 before. Also, add a using directive if it's an anonymous
14612 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
14616 type = read_type_die (die, cu);
14617 new_symbol (die, type, cu);
14619 namespace_name (die, &is_anonymous, cu);
14622 const char *previous_prefix = determine_prefix (die, cu);
14624 add_using_directive (using_directives (cu->language),
14625 previous_prefix, TYPE_NAME (type), NULL,
14626 NULL, NULL, 0, &objfile->objfile_obstack);
14630 if (die->child != NULL)
14632 struct die_info *child_die = die->child;
14634 while (child_die && child_die->tag)
14636 process_die (child_die, cu);
14637 child_die = sibling_die (child_die);
14642 /* Read a Fortran module as type. This DIE can be only a declaration used for
14643 imported module. Still we need that type as local Fortran "use ... only"
14644 declaration imports depend on the created type in determine_prefix. */
14646 static struct type *
14647 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
14649 struct objfile *objfile = cu->objfile;
14650 const char *module_name;
14653 module_name = dwarf2_name (die, cu);
14655 complaint (&symfile_complaints,
14656 _("DW_TAG_module has no name, offset 0x%x"),
14657 to_underlying (die->sect_off));
14658 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
14660 /* determine_prefix uses TYPE_TAG_NAME. */
14661 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14663 return set_die_type (die, type, cu);
14666 /* Read a Fortran module. */
14669 read_module (struct die_info *die, struct dwarf2_cu *cu)
14671 struct die_info *child_die = die->child;
14674 type = read_type_die (die, cu);
14675 new_symbol (die, type, cu);
14677 while (child_die && child_die->tag)
14679 process_die (child_die, cu);
14680 child_die = sibling_die (child_die);
14684 /* Return the name of the namespace represented by DIE. Set
14685 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
14688 static const char *
14689 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
14691 struct die_info *current_die;
14692 const char *name = NULL;
14694 /* Loop through the extensions until we find a name. */
14696 for (current_die = die;
14697 current_die != NULL;
14698 current_die = dwarf2_extension (die, &cu))
14700 /* We don't use dwarf2_name here so that we can detect the absence
14701 of a name -> anonymous namespace. */
14702 name = dwarf2_string_attr (die, DW_AT_name, cu);
14708 /* Is it an anonymous namespace? */
14710 *is_anonymous = (name == NULL);
14712 name = CP_ANONYMOUS_NAMESPACE_STR;
14717 /* Extract all information from a DW_TAG_pointer_type DIE and add to
14718 the user defined type vector. */
14720 static struct type *
14721 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
14723 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
14724 struct comp_unit_head *cu_header = &cu->header;
14726 struct attribute *attr_byte_size;
14727 struct attribute *attr_address_class;
14728 int byte_size, addr_class;
14729 struct type *target_type;
14731 target_type = die_type (die, cu);
14733 /* The die_type call above may have already set the type for this DIE. */
14734 type = get_die_type (die, cu);
14738 type = lookup_pointer_type (target_type);
14740 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
14741 if (attr_byte_size)
14742 byte_size = DW_UNSND (attr_byte_size);
14744 byte_size = cu_header->addr_size;
14746 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
14747 if (attr_address_class)
14748 addr_class = DW_UNSND (attr_address_class);
14750 addr_class = DW_ADDR_none;
14752 /* If the pointer size or address class is different than the
14753 default, create a type variant marked as such and set the
14754 length accordingly. */
14755 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
14757 if (gdbarch_address_class_type_flags_p (gdbarch))
14761 type_flags = gdbarch_address_class_type_flags
14762 (gdbarch, byte_size, addr_class);
14763 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
14765 type = make_type_with_address_space (type, type_flags);
14767 else if (TYPE_LENGTH (type) != byte_size)
14769 complaint (&symfile_complaints,
14770 _("invalid pointer size %d"), byte_size);
14774 /* Should we also complain about unhandled address classes? */
14778 TYPE_LENGTH (type) = byte_size;
14779 return set_die_type (die, type, cu);
14782 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
14783 the user defined type vector. */
14785 static struct type *
14786 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
14789 struct type *to_type;
14790 struct type *domain;
14792 to_type = die_type (die, cu);
14793 domain = die_containing_type (die, cu);
14795 /* The calls above may have already set the type for this DIE. */
14796 type = get_die_type (die, cu);
14800 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
14801 type = lookup_methodptr_type (to_type);
14802 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
14804 struct type *new_type = alloc_type (cu->objfile);
14806 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
14807 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
14808 TYPE_VARARGS (to_type));
14809 type = lookup_methodptr_type (new_type);
14812 type = lookup_memberptr_type (to_type, domain);
14814 return set_die_type (die, type, cu);
14817 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
14818 the user defined type vector. */
14820 static struct type *
14821 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
14822 enum type_code refcode)
14824 struct comp_unit_head *cu_header = &cu->header;
14825 struct type *type, *target_type;
14826 struct attribute *attr;
14828 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
14830 target_type = die_type (die, cu);
14832 /* The die_type call above may have already set the type for this DIE. */
14833 type = get_die_type (die, cu);
14837 type = lookup_reference_type (target_type, refcode);
14838 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14841 TYPE_LENGTH (type) = DW_UNSND (attr);
14845 TYPE_LENGTH (type) = cu_header->addr_size;
14847 return set_die_type (die, type, cu);
14850 /* Add the given cv-qualifiers to the element type of the array. GCC
14851 outputs DWARF type qualifiers that apply to an array, not the
14852 element type. But GDB relies on the array element type to carry
14853 the cv-qualifiers. This mimics section 6.7.3 of the C99
14856 static struct type *
14857 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
14858 struct type *base_type, int cnst, int voltl)
14860 struct type *el_type, *inner_array;
14862 base_type = copy_type (base_type);
14863 inner_array = base_type;
14865 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
14867 TYPE_TARGET_TYPE (inner_array) =
14868 copy_type (TYPE_TARGET_TYPE (inner_array));
14869 inner_array = TYPE_TARGET_TYPE (inner_array);
14872 el_type = TYPE_TARGET_TYPE (inner_array);
14873 cnst |= TYPE_CONST (el_type);
14874 voltl |= TYPE_VOLATILE (el_type);
14875 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
14877 return set_die_type (die, base_type, cu);
14880 static struct type *
14881 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
14883 struct type *base_type, *cv_type;
14885 base_type = die_type (die, cu);
14887 /* The die_type call above may have already set the type for this DIE. */
14888 cv_type = get_die_type (die, cu);
14892 /* In case the const qualifier is applied to an array type, the element type
14893 is so qualified, not the array type (section 6.7.3 of C99). */
14894 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14895 return add_array_cv_type (die, cu, base_type, 1, 0);
14897 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
14898 return set_die_type (die, cv_type, cu);
14901 static struct type *
14902 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
14904 struct type *base_type, *cv_type;
14906 base_type = die_type (die, cu);
14908 /* The die_type call above may have already set the type for this DIE. */
14909 cv_type = get_die_type (die, cu);
14913 /* In case the volatile qualifier is applied to an array type, the
14914 element type is so qualified, not the array type (section 6.7.3
14916 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14917 return add_array_cv_type (die, cu, base_type, 0, 1);
14919 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
14920 return set_die_type (die, cv_type, cu);
14923 /* Handle DW_TAG_restrict_type. */
14925 static struct type *
14926 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
14928 struct type *base_type, *cv_type;
14930 base_type = die_type (die, cu);
14932 /* The die_type call above may have already set the type for this DIE. */
14933 cv_type = get_die_type (die, cu);
14937 cv_type = make_restrict_type (base_type);
14938 return set_die_type (die, cv_type, cu);
14941 /* Handle DW_TAG_atomic_type. */
14943 static struct type *
14944 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
14946 struct type *base_type, *cv_type;
14948 base_type = die_type (die, cu);
14950 /* The die_type call above may have already set the type for this DIE. */
14951 cv_type = get_die_type (die, cu);
14955 cv_type = make_atomic_type (base_type);
14956 return set_die_type (die, cv_type, cu);
14959 /* Extract all information from a DW_TAG_string_type DIE and add to
14960 the user defined type vector. It isn't really a user defined type,
14961 but it behaves like one, with other DIE's using an AT_user_def_type
14962 attribute to reference it. */
14964 static struct type *
14965 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
14967 struct objfile *objfile = cu->objfile;
14968 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14969 struct type *type, *range_type, *index_type, *char_type;
14970 struct attribute *attr;
14971 unsigned int length;
14973 attr = dwarf2_attr (die, DW_AT_string_length, cu);
14976 length = DW_UNSND (attr);
14980 /* Check for the DW_AT_byte_size attribute. */
14981 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14984 length = DW_UNSND (attr);
14992 index_type = objfile_type (objfile)->builtin_int;
14993 range_type = create_static_range_type (NULL, index_type, 1, length);
14994 char_type = language_string_char_type (cu->language_defn, gdbarch);
14995 type = create_string_type (NULL, char_type, range_type);
14997 return set_die_type (die, type, cu);
15000 /* Assuming that DIE corresponds to a function, returns nonzero
15001 if the function is prototyped. */
15004 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
15006 struct attribute *attr;
15008 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
15009 if (attr && (DW_UNSND (attr) != 0))
15012 /* The DWARF standard implies that the DW_AT_prototyped attribute
15013 is only meaninful for C, but the concept also extends to other
15014 languages that allow unprototyped functions (Eg: Objective C).
15015 For all other languages, assume that functions are always
15017 if (cu->language != language_c
15018 && cu->language != language_objc
15019 && cu->language != language_opencl)
15022 /* RealView does not emit DW_AT_prototyped. We can not distinguish
15023 prototyped and unprototyped functions; default to prototyped,
15024 since that is more common in modern code (and RealView warns
15025 about unprototyped functions). */
15026 if (producer_is_realview (cu->producer))
15032 /* Handle DIES due to C code like:
15036 int (*funcp)(int a, long l);
15040 ('funcp' generates a DW_TAG_subroutine_type DIE). */
15042 static struct type *
15043 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
15045 struct objfile *objfile = cu->objfile;
15046 struct type *type; /* Type that this function returns. */
15047 struct type *ftype; /* Function that returns above type. */
15048 struct attribute *attr;
15050 type = die_type (die, cu);
15052 /* The die_type call above may have already set the type for this DIE. */
15053 ftype = get_die_type (die, cu);
15057 ftype = lookup_function_type (type);
15059 if (prototyped_function_p (die, cu))
15060 TYPE_PROTOTYPED (ftype) = 1;
15062 /* Store the calling convention in the type if it's available in
15063 the subroutine die. Otherwise set the calling convention to
15064 the default value DW_CC_normal. */
15065 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
15067 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
15068 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
15069 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
15071 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
15073 /* Record whether the function returns normally to its caller or not
15074 if the DWARF producer set that information. */
15075 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
15076 if (attr && (DW_UNSND (attr) != 0))
15077 TYPE_NO_RETURN (ftype) = 1;
15079 /* We need to add the subroutine type to the die immediately so
15080 we don't infinitely recurse when dealing with parameters
15081 declared as the same subroutine type. */
15082 set_die_type (die, ftype, cu);
15084 if (die->child != NULL)
15086 struct type *void_type = objfile_type (objfile)->builtin_void;
15087 struct die_info *child_die;
15088 int nparams, iparams;
15090 /* Count the number of parameters.
15091 FIXME: GDB currently ignores vararg functions, but knows about
15092 vararg member functions. */
15094 child_die = die->child;
15095 while (child_die && child_die->tag)
15097 if (child_die->tag == DW_TAG_formal_parameter)
15099 else if (child_die->tag == DW_TAG_unspecified_parameters)
15100 TYPE_VARARGS (ftype) = 1;
15101 child_die = sibling_die (child_die);
15104 /* Allocate storage for parameters and fill them in. */
15105 TYPE_NFIELDS (ftype) = nparams;
15106 TYPE_FIELDS (ftype) = (struct field *)
15107 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
15109 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
15110 even if we error out during the parameters reading below. */
15111 for (iparams = 0; iparams < nparams; iparams++)
15112 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
15115 child_die = die->child;
15116 while (child_die && child_die->tag)
15118 if (child_die->tag == DW_TAG_formal_parameter)
15120 struct type *arg_type;
15122 /* DWARF version 2 has no clean way to discern C++
15123 static and non-static member functions. G++ helps
15124 GDB by marking the first parameter for non-static
15125 member functions (which is the this pointer) as
15126 artificial. We pass this information to
15127 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
15129 DWARF version 3 added DW_AT_object_pointer, which GCC
15130 4.5 does not yet generate. */
15131 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
15133 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
15135 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
15136 arg_type = die_type (child_die, cu);
15138 /* RealView does not mark THIS as const, which the testsuite
15139 expects. GCC marks THIS as const in method definitions,
15140 but not in the class specifications (GCC PR 43053). */
15141 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
15142 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
15145 struct dwarf2_cu *arg_cu = cu;
15146 const char *name = dwarf2_name (child_die, cu);
15148 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
15151 /* If the compiler emits this, use it. */
15152 if (follow_die_ref (die, attr, &arg_cu) == child_die)
15155 else if (name && strcmp (name, "this") == 0)
15156 /* Function definitions will have the argument names. */
15158 else if (name == NULL && iparams == 0)
15159 /* Declarations may not have the names, so like
15160 elsewhere in GDB, assume an artificial first
15161 argument is "this". */
15165 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
15169 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
15172 child_die = sibling_die (child_die);
15179 static struct type *
15180 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
15182 struct objfile *objfile = cu->objfile;
15183 const char *name = NULL;
15184 struct type *this_type, *target_type;
15186 name = dwarf2_full_name (NULL, die, cu);
15187 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
15188 TYPE_TARGET_STUB (this_type) = 1;
15189 set_die_type (die, this_type, cu);
15190 target_type = die_type (die, cu);
15191 if (target_type != this_type)
15192 TYPE_TARGET_TYPE (this_type) = target_type;
15195 /* Self-referential typedefs are, it seems, not allowed by the DWARF
15196 spec and cause infinite loops in GDB. */
15197 complaint (&symfile_complaints,
15198 _("Self-referential DW_TAG_typedef "
15199 "- DIE at 0x%x [in module %s]"),
15200 to_underlying (die->sect_off), objfile_name (objfile));
15201 TYPE_TARGET_TYPE (this_type) = NULL;
15206 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
15207 (which may be different from NAME) to the architecture back-end to allow
15208 it to guess the correct format if necessary. */
15210 static struct type *
15211 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
15212 const char *name_hint)
15214 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15215 const struct floatformat **format;
15218 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
15220 type = init_float_type (objfile, bits, name, format);
15222 type = init_type (objfile, TYPE_CODE_ERROR, bits / TARGET_CHAR_BIT, name);
15227 /* Find a representation of a given base type and install
15228 it in the TYPE field of the die. */
15230 static struct type *
15231 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
15233 struct objfile *objfile = cu->objfile;
15235 struct attribute *attr;
15236 int encoding = 0, bits = 0;
15239 attr = dwarf2_attr (die, DW_AT_encoding, cu);
15242 encoding = DW_UNSND (attr);
15244 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15247 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
15249 name = dwarf2_name (die, cu);
15252 complaint (&symfile_complaints,
15253 _("DW_AT_name missing from DW_TAG_base_type"));
15258 case DW_ATE_address:
15259 /* Turn DW_ATE_address into a void * pointer. */
15260 type = init_type (objfile, TYPE_CODE_VOID, 1, NULL);
15261 type = init_pointer_type (objfile, bits, name, type);
15263 case DW_ATE_boolean:
15264 type = init_boolean_type (objfile, bits, 1, name);
15266 case DW_ATE_complex_float:
15267 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
15268 type = init_complex_type (objfile, name, type);
15270 case DW_ATE_decimal_float:
15271 type = init_decfloat_type (objfile, bits, name);
15274 type = dwarf2_init_float_type (objfile, bits, name, name);
15276 case DW_ATE_signed:
15277 type = init_integer_type (objfile, bits, 0, name);
15279 case DW_ATE_unsigned:
15280 if (cu->language == language_fortran
15282 && startswith (name, "character("))
15283 type = init_character_type (objfile, bits, 1, name);
15285 type = init_integer_type (objfile, bits, 1, name);
15287 case DW_ATE_signed_char:
15288 if (cu->language == language_ada || cu->language == language_m2
15289 || cu->language == language_pascal
15290 || cu->language == language_fortran)
15291 type = init_character_type (objfile, bits, 0, name);
15293 type = init_integer_type (objfile, bits, 0, name);
15295 case DW_ATE_unsigned_char:
15296 if (cu->language == language_ada || cu->language == language_m2
15297 || cu->language == language_pascal
15298 || cu->language == language_fortran
15299 || cu->language == language_rust)
15300 type = init_character_type (objfile, bits, 1, name);
15302 type = init_integer_type (objfile, bits, 1, name);
15306 gdbarch *arch = get_objfile_arch (objfile);
15309 type = builtin_type (arch)->builtin_char16;
15310 else if (bits == 32)
15311 type = builtin_type (arch)->builtin_char32;
15314 complaint (&symfile_complaints,
15315 _("unsupported DW_ATE_UTF bit size: '%d'"),
15317 type = init_integer_type (objfile, bits, 1, name);
15319 return set_die_type (die, type, cu);
15324 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
15325 dwarf_type_encoding_name (encoding));
15326 type = init_type (objfile, TYPE_CODE_ERROR,
15327 bits / TARGET_CHAR_BIT, name);
15331 if (name && strcmp (name, "char") == 0)
15332 TYPE_NOSIGN (type) = 1;
15334 return set_die_type (die, type, cu);
15337 /* Parse dwarf attribute if it's a block, reference or constant and put the
15338 resulting value of the attribute into struct bound_prop.
15339 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
15342 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
15343 struct dwarf2_cu *cu, struct dynamic_prop *prop)
15345 struct dwarf2_property_baton *baton;
15346 struct obstack *obstack = &cu->objfile->objfile_obstack;
15348 if (attr == NULL || prop == NULL)
15351 if (attr_form_is_block (attr))
15353 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15354 baton->referenced_type = NULL;
15355 baton->locexpr.per_cu = cu->per_cu;
15356 baton->locexpr.size = DW_BLOCK (attr)->size;
15357 baton->locexpr.data = DW_BLOCK (attr)->data;
15358 prop->data.baton = baton;
15359 prop->kind = PROP_LOCEXPR;
15360 gdb_assert (prop->data.baton != NULL);
15362 else if (attr_form_is_ref (attr))
15364 struct dwarf2_cu *target_cu = cu;
15365 struct die_info *target_die;
15366 struct attribute *target_attr;
15368 target_die = follow_die_ref (die, attr, &target_cu);
15369 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
15370 if (target_attr == NULL)
15371 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
15373 if (target_attr == NULL)
15376 switch (target_attr->name)
15378 case DW_AT_location:
15379 if (attr_form_is_section_offset (target_attr))
15381 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15382 baton->referenced_type = die_type (target_die, target_cu);
15383 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
15384 prop->data.baton = baton;
15385 prop->kind = PROP_LOCLIST;
15386 gdb_assert (prop->data.baton != NULL);
15388 else if (attr_form_is_block (target_attr))
15390 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15391 baton->referenced_type = die_type (target_die, target_cu);
15392 baton->locexpr.per_cu = cu->per_cu;
15393 baton->locexpr.size = DW_BLOCK (target_attr)->size;
15394 baton->locexpr.data = DW_BLOCK (target_attr)->data;
15395 prop->data.baton = baton;
15396 prop->kind = PROP_LOCEXPR;
15397 gdb_assert (prop->data.baton != NULL);
15401 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15402 "dynamic property");
15406 case DW_AT_data_member_location:
15410 if (!handle_data_member_location (target_die, target_cu,
15414 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15415 baton->referenced_type = read_type_die (target_die->parent,
15417 baton->offset_info.offset = offset;
15418 baton->offset_info.type = die_type (target_die, target_cu);
15419 prop->data.baton = baton;
15420 prop->kind = PROP_ADDR_OFFSET;
15425 else if (attr_form_is_constant (attr))
15427 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
15428 prop->kind = PROP_CONST;
15432 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
15433 dwarf2_name (die, cu));
15440 /* Read the given DW_AT_subrange DIE. */
15442 static struct type *
15443 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
15445 struct type *base_type, *orig_base_type;
15446 struct type *range_type;
15447 struct attribute *attr;
15448 struct dynamic_prop low, high;
15449 int low_default_is_valid;
15450 int high_bound_is_count = 0;
15452 LONGEST negative_mask;
15454 orig_base_type = die_type (die, cu);
15455 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
15456 whereas the real type might be. So, we use ORIG_BASE_TYPE when
15457 creating the range type, but we use the result of check_typedef
15458 when examining properties of the type. */
15459 base_type = check_typedef (orig_base_type);
15461 /* The die_type call above may have already set the type for this DIE. */
15462 range_type = get_die_type (die, cu);
15466 low.kind = PROP_CONST;
15467 high.kind = PROP_CONST;
15468 high.data.const_val = 0;
15470 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
15471 omitting DW_AT_lower_bound. */
15472 switch (cu->language)
15475 case language_cplus:
15476 low.data.const_val = 0;
15477 low_default_is_valid = 1;
15479 case language_fortran:
15480 low.data.const_val = 1;
15481 low_default_is_valid = 1;
15484 case language_objc:
15485 case language_rust:
15486 low.data.const_val = 0;
15487 low_default_is_valid = (cu->header.version >= 4);
15491 case language_pascal:
15492 low.data.const_val = 1;
15493 low_default_is_valid = (cu->header.version >= 4);
15496 low.data.const_val = 0;
15497 low_default_is_valid = 0;
15501 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
15503 attr_to_dynamic_prop (attr, die, cu, &low);
15504 else if (!low_default_is_valid)
15505 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
15506 "- DIE at 0x%x [in module %s]"),
15507 to_underlying (die->sect_off), objfile_name (cu->objfile));
15509 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
15510 if (!attr_to_dynamic_prop (attr, die, cu, &high))
15512 attr = dwarf2_attr (die, DW_AT_count, cu);
15513 if (attr_to_dynamic_prop (attr, die, cu, &high))
15515 /* If bounds are constant do the final calculation here. */
15516 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
15517 high.data.const_val = low.data.const_val + high.data.const_val - 1;
15519 high_bound_is_count = 1;
15523 /* Dwarf-2 specifications explicitly allows to create subrange types
15524 without specifying a base type.
15525 In that case, the base type must be set to the type of
15526 the lower bound, upper bound or count, in that order, if any of these
15527 three attributes references an object that has a type.
15528 If no base type is found, the Dwarf-2 specifications say that
15529 a signed integer type of size equal to the size of an address should
15531 For the following C code: `extern char gdb_int [];'
15532 GCC produces an empty range DIE.
15533 FIXME: muller/2010-05-28: Possible references to object for low bound,
15534 high bound or count are not yet handled by this code. */
15535 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
15537 struct objfile *objfile = cu->objfile;
15538 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15539 int addr_size = gdbarch_addr_bit (gdbarch) /8;
15540 struct type *int_type = objfile_type (objfile)->builtin_int;
15542 /* Test "int", "long int", and "long long int" objfile types,
15543 and select the first one having a size above or equal to the
15544 architecture address size. */
15545 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15546 base_type = int_type;
15549 int_type = objfile_type (objfile)->builtin_long;
15550 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15551 base_type = int_type;
15554 int_type = objfile_type (objfile)->builtin_long_long;
15555 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15556 base_type = int_type;
15561 /* Normally, the DWARF producers are expected to use a signed
15562 constant form (Eg. DW_FORM_sdata) to express negative bounds.
15563 But this is unfortunately not always the case, as witnessed
15564 with GCC, for instance, where the ambiguous DW_FORM_dataN form
15565 is used instead. To work around that ambiguity, we treat
15566 the bounds as signed, and thus sign-extend their values, when
15567 the base type is signed. */
15569 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
15570 if (low.kind == PROP_CONST
15571 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
15572 low.data.const_val |= negative_mask;
15573 if (high.kind == PROP_CONST
15574 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
15575 high.data.const_val |= negative_mask;
15577 range_type = create_range_type (NULL, orig_base_type, &low, &high);
15579 if (high_bound_is_count)
15580 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
15582 /* Ada expects an empty array on no boundary attributes. */
15583 if (attr == NULL && cu->language != language_ada)
15584 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
15586 name = dwarf2_name (die, cu);
15588 TYPE_NAME (range_type) = name;
15590 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15592 TYPE_LENGTH (range_type) = DW_UNSND (attr);
15594 set_die_type (die, range_type, cu);
15596 /* set_die_type should be already done. */
15597 set_descriptive_type (range_type, die, cu);
15602 static struct type *
15603 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
15607 /* For now, we only support the C meaning of an unspecified type: void. */
15609 type = init_type (cu->objfile, TYPE_CODE_VOID, 0, NULL);
15610 TYPE_NAME (type) = dwarf2_name (die, cu);
15612 return set_die_type (die, type, cu);
15615 /* Read a single die and all its descendents. Set the die's sibling
15616 field to NULL; set other fields in the die correctly, and set all
15617 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
15618 location of the info_ptr after reading all of those dies. PARENT
15619 is the parent of the die in question. */
15621 static struct die_info *
15622 read_die_and_children (const struct die_reader_specs *reader,
15623 const gdb_byte *info_ptr,
15624 const gdb_byte **new_info_ptr,
15625 struct die_info *parent)
15627 struct die_info *die;
15628 const gdb_byte *cur_ptr;
15631 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
15634 *new_info_ptr = cur_ptr;
15637 store_in_ref_table (die, reader->cu);
15640 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
15644 *new_info_ptr = cur_ptr;
15647 die->sibling = NULL;
15648 die->parent = parent;
15652 /* Read a die, all of its descendents, and all of its siblings; set
15653 all of the fields of all of the dies correctly. Arguments are as
15654 in read_die_and_children. */
15656 static struct die_info *
15657 read_die_and_siblings_1 (const struct die_reader_specs *reader,
15658 const gdb_byte *info_ptr,
15659 const gdb_byte **new_info_ptr,
15660 struct die_info *parent)
15662 struct die_info *first_die, *last_sibling;
15663 const gdb_byte *cur_ptr;
15665 cur_ptr = info_ptr;
15666 first_die = last_sibling = NULL;
15670 struct die_info *die
15671 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
15675 *new_info_ptr = cur_ptr;
15682 last_sibling->sibling = die;
15684 last_sibling = die;
15688 /* Read a die, all of its descendents, and all of its siblings; set
15689 all of the fields of all of the dies correctly. Arguments are as
15690 in read_die_and_children.
15691 This the main entry point for reading a DIE and all its children. */
15693 static struct die_info *
15694 read_die_and_siblings (const struct die_reader_specs *reader,
15695 const gdb_byte *info_ptr,
15696 const gdb_byte **new_info_ptr,
15697 struct die_info *parent)
15699 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
15700 new_info_ptr, parent);
15702 if (dwarf_die_debug)
15704 fprintf_unfiltered (gdb_stdlog,
15705 "Read die from %s@0x%x of %s:\n",
15706 get_section_name (reader->die_section),
15707 (unsigned) (info_ptr - reader->die_section->buffer),
15708 bfd_get_filename (reader->abfd));
15709 dump_die (die, dwarf_die_debug);
15715 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
15717 The caller is responsible for filling in the extra attributes
15718 and updating (*DIEP)->num_attrs.
15719 Set DIEP to point to a newly allocated die with its information,
15720 except for its child, sibling, and parent fields.
15721 Set HAS_CHILDREN to tell whether the die has children or not. */
15723 static const gdb_byte *
15724 read_full_die_1 (const struct die_reader_specs *reader,
15725 struct die_info **diep, const gdb_byte *info_ptr,
15726 int *has_children, int num_extra_attrs)
15728 unsigned int abbrev_number, bytes_read, i;
15729 struct abbrev_info *abbrev;
15730 struct die_info *die;
15731 struct dwarf2_cu *cu = reader->cu;
15732 bfd *abfd = reader->abfd;
15734 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
15735 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15736 info_ptr += bytes_read;
15737 if (!abbrev_number)
15744 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
15746 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
15748 bfd_get_filename (abfd));
15750 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
15751 die->sect_off = sect_off;
15752 die->tag = abbrev->tag;
15753 die->abbrev = abbrev_number;
15755 /* Make the result usable.
15756 The caller needs to update num_attrs after adding the extra
15758 die->num_attrs = abbrev->num_attrs;
15760 for (i = 0; i < abbrev->num_attrs; ++i)
15761 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
15765 *has_children = abbrev->has_children;
15769 /* Read a die and all its attributes.
15770 Set DIEP to point to a newly allocated die with its information,
15771 except for its child, sibling, and parent fields.
15772 Set HAS_CHILDREN to tell whether the die has children or not. */
15774 static const gdb_byte *
15775 read_full_die (const struct die_reader_specs *reader,
15776 struct die_info **diep, const gdb_byte *info_ptr,
15779 const gdb_byte *result;
15781 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
15783 if (dwarf_die_debug)
15785 fprintf_unfiltered (gdb_stdlog,
15786 "Read die from %s@0x%x of %s:\n",
15787 get_section_name (reader->die_section),
15788 (unsigned) (info_ptr - reader->die_section->buffer),
15789 bfd_get_filename (reader->abfd));
15790 dump_die (*diep, dwarf_die_debug);
15796 /* Abbreviation tables.
15798 In DWARF version 2, the description of the debugging information is
15799 stored in a separate .debug_abbrev section. Before we read any
15800 dies from a section we read in all abbreviations and install them
15801 in a hash table. */
15803 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
15805 static struct abbrev_info *
15806 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
15808 struct abbrev_info *abbrev;
15810 abbrev = XOBNEW (&abbrev_table->abbrev_obstack, struct abbrev_info);
15811 memset (abbrev, 0, sizeof (struct abbrev_info));
15816 /* Add an abbreviation to the table. */
15819 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
15820 unsigned int abbrev_number,
15821 struct abbrev_info *abbrev)
15823 unsigned int hash_number;
15825 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15826 abbrev->next = abbrev_table->abbrevs[hash_number];
15827 abbrev_table->abbrevs[hash_number] = abbrev;
15830 /* Look up an abbrev in the table.
15831 Returns NULL if the abbrev is not found. */
15833 static struct abbrev_info *
15834 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
15835 unsigned int abbrev_number)
15837 unsigned int hash_number;
15838 struct abbrev_info *abbrev;
15840 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15841 abbrev = abbrev_table->abbrevs[hash_number];
15845 if (abbrev->number == abbrev_number)
15847 abbrev = abbrev->next;
15852 /* Read in an abbrev table. */
15854 static struct abbrev_table *
15855 abbrev_table_read_table (struct dwarf2_section_info *section,
15856 sect_offset sect_off)
15858 struct objfile *objfile = dwarf2_per_objfile->objfile;
15859 bfd *abfd = get_section_bfd_owner (section);
15860 struct abbrev_table *abbrev_table;
15861 const gdb_byte *abbrev_ptr;
15862 struct abbrev_info *cur_abbrev;
15863 unsigned int abbrev_number, bytes_read, abbrev_name;
15864 unsigned int abbrev_form;
15865 struct attr_abbrev *cur_attrs;
15866 unsigned int allocated_attrs;
15868 abbrev_table = XNEW (struct abbrev_table);
15869 abbrev_table->sect_off = sect_off;
15870 obstack_init (&abbrev_table->abbrev_obstack);
15871 abbrev_table->abbrevs =
15872 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct abbrev_info *,
15874 memset (abbrev_table->abbrevs, 0,
15875 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
15877 dwarf2_read_section (objfile, section);
15878 abbrev_ptr = section->buffer + to_underlying (sect_off);
15879 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15880 abbrev_ptr += bytes_read;
15882 allocated_attrs = ATTR_ALLOC_CHUNK;
15883 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
15885 /* Loop until we reach an abbrev number of 0. */
15886 while (abbrev_number)
15888 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
15890 /* read in abbrev header */
15891 cur_abbrev->number = abbrev_number;
15893 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15894 abbrev_ptr += bytes_read;
15895 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
15898 /* now read in declarations */
15901 LONGEST implicit_const;
15903 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15904 abbrev_ptr += bytes_read;
15905 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15906 abbrev_ptr += bytes_read;
15907 if (abbrev_form == DW_FORM_implicit_const)
15909 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
15911 abbrev_ptr += bytes_read;
15915 /* Initialize it due to a false compiler warning. */
15916 implicit_const = -1;
15919 if (abbrev_name == 0)
15922 if (cur_abbrev->num_attrs == allocated_attrs)
15924 allocated_attrs += ATTR_ALLOC_CHUNK;
15926 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
15929 cur_attrs[cur_abbrev->num_attrs].name
15930 = (enum dwarf_attribute) abbrev_name;
15931 cur_attrs[cur_abbrev->num_attrs].form
15932 = (enum dwarf_form) abbrev_form;
15933 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
15934 ++cur_abbrev->num_attrs;
15937 cur_abbrev->attrs =
15938 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
15939 cur_abbrev->num_attrs);
15940 memcpy (cur_abbrev->attrs, cur_attrs,
15941 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
15943 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
15945 /* Get next abbreviation.
15946 Under Irix6 the abbreviations for a compilation unit are not
15947 always properly terminated with an abbrev number of 0.
15948 Exit loop if we encounter an abbreviation which we have
15949 already read (which means we are about to read the abbreviations
15950 for the next compile unit) or if the end of the abbreviation
15951 table is reached. */
15952 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
15954 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15955 abbrev_ptr += bytes_read;
15956 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
15961 return abbrev_table;
15964 /* Free the resources held by ABBREV_TABLE. */
15967 abbrev_table_free (struct abbrev_table *abbrev_table)
15969 obstack_free (&abbrev_table->abbrev_obstack, NULL);
15970 xfree (abbrev_table);
15973 /* Same as abbrev_table_free but as a cleanup.
15974 We pass in a pointer to the pointer to the table so that we can
15975 set the pointer to NULL when we're done. It also simplifies
15976 build_type_psymtabs_1. */
15979 abbrev_table_free_cleanup (void *table_ptr)
15981 struct abbrev_table **abbrev_table_ptr = (struct abbrev_table **) table_ptr;
15983 if (*abbrev_table_ptr != NULL)
15984 abbrev_table_free (*abbrev_table_ptr);
15985 *abbrev_table_ptr = NULL;
15988 /* Read the abbrev table for CU from ABBREV_SECTION. */
15991 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
15992 struct dwarf2_section_info *abbrev_section)
15995 abbrev_table_read_table (abbrev_section, cu->header.abbrev_sect_off);
15998 /* Release the memory used by the abbrev table for a compilation unit. */
16001 dwarf2_free_abbrev_table (void *ptr_to_cu)
16003 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr_to_cu;
16005 if (cu->abbrev_table != NULL)
16006 abbrev_table_free (cu->abbrev_table);
16007 /* Set this to NULL so that we SEGV if we try to read it later,
16008 and also because free_comp_unit verifies this is NULL. */
16009 cu->abbrev_table = NULL;
16012 /* Returns nonzero if TAG represents a type that we might generate a partial
16016 is_type_tag_for_partial (int tag)
16021 /* Some types that would be reasonable to generate partial symbols for,
16022 that we don't at present. */
16023 case DW_TAG_array_type:
16024 case DW_TAG_file_type:
16025 case DW_TAG_ptr_to_member_type:
16026 case DW_TAG_set_type:
16027 case DW_TAG_string_type:
16028 case DW_TAG_subroutine_type:
16030 case DW_TAG_base_type:
16031 case DW_TAG_class_type:
16032 case DW_TAG_interface_type:
16033 case DW_TAG_enumeration_type:
16034 case DW_TAG_structure_type:
16035 case DW_TAG_subrange_type:
16036 case DW_TAG_typedef:
16037 case DW_TAG_union_type:
16044 /* Load all DIEs that are interesting for partial symbols into memory. */
16046 static struct partial_die_info *
16047 load_partial_dies (const struct die_reader_specs *reader,
16048 const gdb_byte *info_ptr, int building_psymtab)
16050 struct dwarf2_cu *cu = reader->cu;
16051 struct objfile *objfile = cu->objfile;
16052 struct partial_die_info *part_die;
16053 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
16054 struct abbrev_info *abbrev;
16055 unsigned int bytes_read;
16056 unsigned int load_all = 0;
16057 int nesting_level = 1;
16062 gdb_assert (cu->per_cu != NULL);
16063 if (cu->per_cu->load_all_dies)
16067 = htab_create_alloc_ex (cu->header.length / 12,
16071 &cu->comp_unit_obstack,
16072 hashtab_obstack_allocate,
16073 dummy_obstack_deallocate);
16075 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
16079 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
16081 /* A NULL abbrev means the end of a series of children. */
16082 if (abbrev == NULL)
16084 if (--nesting_level == 0)
16086 /* PART_DIE was probably the last thing allocated on the
16087 comp_unit_obstack, so we could call obstack_free
16088 here. We don't do that because the waste is small,
16089 and will be cleaned up when we're done with this
16090 compilation unit. This way, we're also more robust
16091 against other users of the comp_unit_obstack. */
16094 info_ptr += bytes_read;
16095 last_die = parent_die;
16096 parent_die = parent_die->die_parent;
16100 /* Check for template arguments. We never save these; if
16101 they're seen, we just mark the parent, and go on our way. */
16102 if (parent_die != NULL
16103 && cu->language == language_cplus
16104 && (abbrev->tag == DW_TAG_template_type_param
16105 || abbrev->tag == DW_TAG_template_value_param))
16107 parent_die->has_template_arguments = 1;
16111 /* We don't need a partial DIE for the template argument. */
16112 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16117 /* We only recurse into c++ subprograms looking for template arguments.
16118 Skip their other children. */
16120 && cu->language == language_cplus
16121 && parent_die != NULL
16122 && parent_die->tag == DW_TAG_subprogram)
16124 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16128 /* Check whether this DIE is interesting enough to save. Normally
16129 we would not be interested in members here, but there may be
16130 later variables referencing them via DW_AT_specification (for
16131 static members). */
16133 && !is_type_tag_for_partial (abbrev->tag)
16134 && abbrev->tag != DW_TAG_constant
16135 && abbrev->tag != DW_TAG_enumerator
16136 && abbrev->tag != DW_TAG_subprogram
16137 && abbrev->tag != DW_TAG_lexical_block
16138 && abbrev->tag != DW_TAG_variable
16139 && abbrev->tag != DW_TAG_namespace
16140 && abbrev->tag != DW_TAG_module
16141 && abbrev->tag != DW_TAG_member
16142 && abbrev->tag != DW_TAG_imported_unit
16143 && abbrev->tag != DW_TAG_imported_declaration)
16145 /* Otherwise we skip to the next sibling, if any. */
16146 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16150 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
16153 /* This two-pass algorithm for processing partial symbols has a
16154 high cost in cache pressure. Thus, handle some simple cases
16155 here which cover the majority of C partial symbols. DIEs
16156 which neither have specification tags in them, nor could have
16157 specification tags elsewhere pointing at them, can simply be
16158 processed and discarded.
16160 This segment is also optional; scan_partial_symbols and
16161 add_partial_symbol will handle these DIEs if we chain
16162 them in normally. When compilers which do not emit large
16163 quantities of duplicate debug information are more common,
16164 this code can probably be removed. */
16166 /* Any complete simple types at the top level (pretty much all
16167 of them, for a language without namespaces), can be processed
16169 if (parent_die == NULL
16170 && part_die->has_specification == 0
16171 && part_die->is_declaration == 0
16172 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
16173 || part_die->tag == DW_TAG_base_type
16174 || part_die->tag == DW_TAG_subrange_type))
16176 if (building_psymtab && part_die->name != NULL)
16177 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16178 VAR_DOMAIN, LOC_TYPEDEF,
16179 &objfile->static_psymbols,
16180 0, cu->language, objfile);
16181 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16185 /* The exception for DW_TAG_typedef with has_children above is
16186 a workaround of GCC PR debug/47510. In the case of this complaint
16187 type_name_no_tag_or_error will error on such types later.
16189 GDB skipped children of DW_TAG_typedef by the shortcut above and then
16190 it could not find the child DIEs referenced later, this is checked
16191 above. In correct DWARF DW_TAG_typedef should have no children. */
16193 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
16194 complaint (&symfile_complaints,
16195 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
16196 "- DIE at 0x%x [in module %s]"),
16197 to_underlying (part_die->sect_off), objfile_name (objfile));
16199 /* If we're at the second level, and we're an enumerator, and
16200 our parent has no specification (meaning possibly lives in a
16201 namespace elsewhere), then we can add the partial symbol now
16202 instead of queueing it. */
16203 if (part_die->tag == DW_TAG_enumerator
16204 && parent_die != NULL
16205 && parent_die->die_parent == NULL
16206 && parent_die->tag == DW_TAG_enumeration_type
16207 && parent_die->has_specification == 0)
16209 if (part_die->name == NULL)
16210 complaint (&symfile_complaints,
16211 _("malformed enumerator DIE ignored"));
16212 else if (building_psymtab)
16213 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16214 VAR_DOMAIN, LOC_CONST,
16215 cu->language == language_cplus
16216 ? &objfile->global_psymbols
16217 : &objfile->static_psymbols,
16218 0, cu->language, objfile);
16220 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16224 /* We'll save this DIE so link it in. */
16225 part_die->die_parent = parent_die;
16226 part_die->die_sibling = NULL;
16227 part_die->die_child = NULL;
16229 if (last_die && last_die == parent_die)
16230 last_die->die_child = part_die;
16232 last_die->die_sibling = part_die;
16234 last_die = part_die;
16236 if (first_die == NULL)
16237 first_die = part_die;
16239 /* Maybe add the DIE to the hash table. Not all DIEs that we
16240 find interesting need to be in the hash table, because we
16241 also have the parent/sibling/child chains; only those that we
16242 might refer to by offset later during partial symbol reading.
16244 For now this means things that might have be the target of a
16245 DW_AT_specification, DW_AT_abstract_origin, or
16246 DW_AT_extension. DW_AT_extension will refer only to
16247 namespaces; DW_AT_abstract_origin refers to functions (and
16248 many things under the function DIE, but we do not recurse
16249 into function DIEs during partial symbol reading) and
16250 possibly variables as well; DW_AT_specification refers to
16251 declarations. Declarations ought to have the DW_AT_declaration
16252 flag. It happens that GCC forgets to put it in sometimes, but
16253 only for functions, not for types.
16255 Adding more things than necessary to the hash table is harmless
16256 except for the performance cost. Adding too few will result in
16257 wasted time in find_partial_die, when we reread the compilation
16258 unit with load_all_dies set. */
16261 || abbrev->tag == DW_TAG_constant
16262 || abbrev->tag == DW_TAG_subprogram
16263 || abbrev->tag == DW_TAG_variable
16264 || abbrev->tag == DW_TAG_namespace
16265 || part_die->is_declaration)
16269 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
16270 to_underlying (part_die->sect_off),
16275 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
16277 /* For some DIEs we want to follow their children (if any). For C
16278 we have no reason to follow the children of structures; for other
16279 languages we have to, so that we can get at method physnames
16280 to infer fully qualified class names, for DW_AT_specification,
16281 and for C++ template arguments. For C++, we also look one level
16282 inside functions to find template arguments (if the name of the
16283 function does not already contain the template arguments).
16285 For Ada, we need to scan the children of subprograms and lexical
16286 blocks as well because Ada allows the definition of nested
16287 entities that could be interesting for the debugger, such as
16288 nested subprograms for instance. */
16289 if (last_die->has_children
16291 || last_die->tag == DW_TAG_namespace
16292 || last_die->tag == DW_TAG_module
16293 || last_die->tag == DW_TAG_enumeration_type
16294 || (cu->language == language_cplus
16295 && last_die->tag == DW_TAG_subprogram
16296 && (last_die->name == NULL
16297 || strchr (last_die->name, '<') == NULL))
16298 || (cu->language != language_c
16299 && (last_die->tag == DW_TAG_class_type
16300 || last_die->tag == DW_TAG_interface_type
16301 || last_die->tag == DW_TAG_structure_type
16302 || last_die->tag == DW_TAG_union_type))
16303 || (cu->language == language_ada
16304 && (last_die->tag == DW_TAG_subprogram
16305 || last_die->tag == DW_TAG_lexical_block))))
16308 parent_die = last_die;
16312 /* Otherwise we skip to the next sibling, if any. */
16313 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
16315 /* Back to the top, do it again. */
16319 /* Read a minimal amount of information into the minimal die structure. */
16321 static const gdb_byte *
16322 read_partial_die (const struct die_reader_specs *reader,
16323 struct partial_die_info *part_die,
16324 struct abbrev_info *abbrev, unsigned int abbrev_len,
16325 const gdb_byte *info_ptr)
16327 struct dwarf2_cu *cu = reader->cu;
16328 struct objfile *objfile = cu->objfile;
16329 const gdb_byte *buffer = reader->buffer;
16331 struct attribute attr;
16332 int has_low_pc_attr = 0;
16333 int has_high_pc_attr = 0;
16334 int high_pc_relative = 0;
16336 memset (part_die, 0, sizeof (struct partial_die_info));
16338 part_die->sect_off = (sect_offset) (info_ptr - buffer);
16340 info_ptr += abbrev_len;
16342 if (abbrev == NULL)
16345 part_die->tag = abbrev->tag;
16346 part_die->has_children = abbrev->has_children;
16348 for (i = 0; i < abbrev->num_attrs; ++i)
16350 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
16352 /* Store the data if it is of an attribute we want to keep in a
16353 partial symbol table. */
16357 switch (part_die->tag)
16359 case DW_TAG_compile_unit:
16360 case DW_TAG_partial_unit:
16361 case DW_TAG_type_unit:
16362 /* Compilation units have a DW_AT_name that is a filename, not
16363 a source language identifier. */
16364 case DW_TAG_enumeration_type:
16365 case DW_TAG_enumerator:
16366 /* These tags always have simple identifiers already; no need
16367 to canonicalize them. */
16368 part_die->name = DW_STRING (&attr);
16372 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
16373 &objfile->per_bfd->storage_obstack);
16377 case DW_AT_linkage_name:
16378 case DW_AT_MIPS_linkage_name:
16379 /* Note that both forms of linkage name might appear. We
16380 assume they will be the same, and we only store the last
16382 if (cu->language == language_ada)
16383 part_die->name = DW_STRING (&attr);
16384 part_die->linkage_name = DW_STRING (&attr);
16387 has_low_pc_attr = 1;
16388 part_die->lowpc = attr_value_as_address (&attr);
16390 case DW_AT_high_pc:
16391 has_high_pc_attr = 1;
16392 part_die->highpc = attr_value_as_address (&attr);
16393 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
16394 high_pc_relative = 1;
16396 case DW_AT_location:
16397 /* Support the .debug_loc offsets. */
16398 if (attr_form_is_block (&attr))
16400 part_die->d.locdesc = DW_BLOCK (&attr);
16402 else if (attr_form_is_section_offset (&attr))
16404 dwarf2_complex_location_expr_complaint ();
16408 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16409 "partial symbol information");
16412 case DW_AT_external:
16413 part_die->is_external = DW_UNSND (&attr);
16415 case DW_AT_declaration:
16416 part_die->is_declaration = DW_UNSND (&attr);
16419 part_die->has_type = 1;
16421 case DW_AT_abstract_origin:
16422 case DW_AT_specification:
16423 case DW_AT_extension:
16424 part_die->has_specification = 1;
16425 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
16426 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
16427 || cu->per_cu->is_dwz);
16429 case DW_AT_sibling:
16430 /* Ignore absolute siblings, they might point outside of
16431 the current compile unit. */
16432 if (attr.form == DW_FORM_ref_addr)
16433 complaint (&symfile_complaints,
16434 _("ignoring absolute DW_AT_sibling"));
16437 sect_offset off = dwarf2_get_ref_die_offset (&attr);
16438 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
16440 if (sibling_ptr < info_ptr)
16441 complaint (&symfile_complaints,
16442 _("DW_AT_sibling points backwards"));
16443 else if (sibling_ptr > reader->buffer_end)
16444 dwarf2_section_buffer_overflow_complaint (reader->die_section);
16446 part_die->sibling = sibling_ptr;
16449 case DW_AT_byte_size:
16450 part_die->has_byte_size = 1;
16452 case DW_AT_const_value:
16453 part_die->has_const_value = 1;
16455 case DW_AT_calling_convention:
16456 /* DWARF doesn't provide a way to identify a program's source-level
16457 entry point. DW_AT_calling_convention attributes are only meant
16458 to describe functions' calling conventions.
16460 However, because it's a necessary piece of information in
16461 Fortran, and before DWARF 4 DW_CC_program was the only
16462 piece of debugging information whose definition refers to
16463 a 'main program' at all, several compilers marked Fortran
16464 main programs with DW_CC_program --- even when those
16465 functions use the standard calling conventions.
16467 Although DWARF now specifies a way to provide this
16468 information, we support this practice for backward
16470 if (DW_UNSND (&attr) == DW_CC_program
16471 && cu->language == language_fortran)
16472 part_die->main_subprogram = 1;
16475 if (DW_UNSND (&attr) == DW_INL_inlined
16476 || DW_UNSND (&attr) == DW_INL_declared_inlined)
16477 part_die->may_be_inlined = 1;
16481 if (part_die->tag == DW_TAG_imported_unit)
16483 part_die->d.sect_off = dwarf2_get_ref_die_offset (&attr);
16484 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
16485 || cu->per_cu->is_dwz);
16489 case DW_AT_main_subprogram:
16490 part_die->main_subprogram = DW_UNSND (&attr);
16498 if (high_pc_relative)
16499 part_die->highpc += part_die->lowpc;
16501 if (has_low_pc_attr && has_high_pc_attr)
16503 /* When using the GNU linker, .gnu.linkonce. sections are used to
16504 eliminate duplicate copies of functions and vtables and such.
16505 The linker will arbitrarily choose one and discard the others.
16506 The AT_*_pc values for such functions refer to local labels in
16507 these sections. If the section from that file was discarded, the
16508 labels are not in the output, so the relocs get a value of 0.
16509 If this is a discarded function, mark the pc bounds as invalid,
16510 so that GDB will ignore it. */
16511 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
16513 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16515 complaint (&symfile_complaints,
16516 _("DW_AT_low_pc %s is zero "
16517 "for DIE at 0x%x [in module %s]"),
16518 paddress (gdbarch, part_die->lowpc),
16519 to_underlying (part_die->sect_off), objfile_name (objfile));
16521 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
16522 else if (part_die->lowpc >= part_die->highpc)
16524 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16526 complaint (&symfile_complaints,
16527 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
16528 "for DIE at 0x%x [in module %s]"),
16529 paddress (gdbarch, part_die->lowpc),
16530 paddress (gdbarch, part_die->highpc),
16531 to_underlying (part_die->sect_off),
16532 objfile_name (objfile));
16535 part_die->has_pc_info = 1;
16541 /* Find a cached partial DIE at OFFSET in CU. */
16543 static struct partial_die_info *
16544 find_partial_die_in_comp_unit (sect_offset sect_off, struct dwarf2_cu *cu)
16546 struct partial_die_info *lookup_die = NULL;
16547 struct partial_die_info part_die;
16549 part_die.sect_off = sect_off;
16550 lookup_die = ((struct partial_die_info *)
16551 htab_find_with_hash (cu->partial_dies, &part_die,
16552 to_underlying (sect_off)));
16557 /* Find a partial DIE at OFFSET, which may or may not be in CU,
16558 except in the case of .debug_types DIEs which do not reference
16559 outside their CU (they do however referencing other types via
16560 DW_FORM_ref_sig8). */
16562 static struct partial_die_info *
16563 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
16565 struct objfile *objfile = cu->objfile;
16566 struct dwarf2_per_cu_data *per_cu = NULL;
16567 struct partial_die_info *pd = NULL;
16569 if (offset_in_dwz == cu->per_cu->is_dwz
16570 && offset_in_cu_p (&cu->header, sect_off))
16572 pd = find_partial_die_in_comp_unit (sect_off, cu);
16575 /* We missed recording what we needed.
16576 Load all dies and try again. */
16577 per_cu = cu->per_cu;
16581 /* TUs don't reference other CUs/TUs (except via type signatures). */
16582 if (cu->per_cu->is_debug_types)
16584 error (_("Dwarf Error: Type Unit at offset 0x%x contains"
16585 " external reference to offset 0x%x [in module %s].\n"),
16586 to_underlying (cu->header.sect_off), to_underlying (sect_off),
16587 bfd_get_filename (objfile->obfd));
16589 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
16592 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
16593 load_partial_comp_unit (per_cu);
16595 per_cu->cu->last_used = 0;
16596 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
16599 /* If we didn't find it, and not all dies have been loaded,
16600 load them all and try again. */
16602 if (pd == NULL && per_cu->load_all_dies == 0)
16604 per_cu->load_all_dies = 1;
16606 /* This is nasty. When we reread the DIEs, somewhere up the call chain
16607 THIS_CU->cu may already be in use. So we can't just free it and
16608 replace its DIEs with the ones we read in. Instead, we leave those
16609 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
16610 and clobber THIS_CU->cu->partial_dies with the hash table for the new
16612 load_partial_comp_unit (per_cu);
16614 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
16618 internal_error (__FILE__, __LINE__,
16619 _("could not find partial DIE 0x%x "
16620 "in cache [from module %s]\n"),
16621 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
16625 /* See if we can figure out if the class lives in a namespace. We do
16626 this by looking for a member function; its demangled name will
16627 contain namespace info, if there is any. */
16630 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
16631 struct dwarf2_cu *cu)
16633 /* NOTE: carlton/2003-10-07: Getting the info this way changes
16634 what template types look like, because the demangler
16635 frequently doesn't give the same name as the debug info. We
16636 could fix this by only using the demangled name to get the
16637 prefix (but see comment in read_structure_type). */
16639 struct partial_die_info *real_pdi;
16640 struct partial_die_info *child_pdi;
16642 /* If this DIE (this DIE's specification, if any) has a parent, then
16643 we should not do this. We'll prepend the parent's fully qualified
16644 name when we create the partial symbol. */
16646 real_pdi = struct_pdi;
16647 while (real_pdi->has_specification)
16648 real_pdi = find_partial_die (real_pdi->spec_offset,
16649 real_pdi->spec_is_dwz, cu);
16651 if (real_pdi->die_parent != NULL)
16654 for (child_pdi = struct_pdi->die_child;
16656 child_pdi = child_pdi->die_sibling)
16658 if (child_pdi->tag == DW_TAG_subprogram
16659 && child_pdi->linkage_name != NULL)
16661 char *actual_class_name
16662 = language_class_name_from_physname (cu->language_defn,
16663 child_pdi->linkage_name);
16664 if (actual_class_name != NULL)
16668 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16670 strlen (actual_class_name)));
16671 xfree (actual_class_name);
16678 /* Adjust PART_DIE before generating a symbol for it. This function
16679 may set the is_external flag or change the DIE's name. */
16682 fixup_partial_die (struct partial_die_info *part_die,
16683 struct dwarf2_cu *cu)
16685 /* Once we've fixed up a die, there's no point in doing so again.
16686 This also avoids a memory leak if we were to call
16687 guess_partial_die_structure_name multiple times. */
16688 if (part_die->fixup_called)
16691 /* If we found a reference attribute and the DIE has no name, try
16692 to find a name in the referred to DIE. */
16694 if (part_die->name == NULL && part_die->has_specification)
16696 struct partial_die_info *spec_die;
16698 spec_die = find_partial_die (part_die->spec_offset,
16699 part_die->spec_is_dwz, cu);
16701 fixup_partial_die (spec_die, cu);
16703 if (spec_die->name)
16705 part_die->name = spec_die->name;
16707 /* Copy DW_AT_external attribute if it is set. */
16708 if (spec_die->is_external)
16709 part_die->is_external = spec_die->is_external;
16713 /* Set default names for some unnamed DIEs. */
16715 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
16716 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
16718 /* If there is no parent die to provide a namespace, and there are
16719 children, see if we can determine the namespace from their linkage
16721 if (cu->language == language_cplus
16722 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
16723 && part_die->die_parent == NULL
16724 && part_die->has_children
16725 && (part_die->tag == DW_TAG_class_type
16726 || part_die->tag == DW_TAG_structure_type
16727 || part_die->tag == DW_TAG_union_type))
16728 guess_partial_die_structure_name (part_die, cu);
16730 /* GCC might emit a nameless struct or union that has a linkage
16731 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
16732 if (part_die->name == NULL
16733 && (part_die->tag == DW_TAG_class_type
16734 || part_die->tag == DW_TAG_interface_type
16735 || part_die->tag == DW_TAG_structure_type
16736 || part_die->tag == DW_TAG_union_type)
16737 && part_die->linkage_name != NULL)
16741 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
16746 /* Strip any leading namespaces/classes, keep only the base name.
16747 DW_AT_name for named DIEs does not contain the prefixes. */
16748 base = strrchr (demangled, ':');
16749 if (base && base > demangled && base[-1] == ':')
16756 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16757 base, strlen (base)));
16762 part_die->fixup_called = 1;
16765 /* Read an attribute value described by an attribute form. */
16767 static const gdb_byte *
16768 read_attribute_value (const struct die_reader_specs *reader,
16769 struct attribute *attr, unsigned form,
16770 LONGEST implicit_const, const gdb_byte *info_ptr)
16772 struct dwarf2_cu *cu = reader->cu;
16773 struct objfile *objfile = cu->objfile;
16774 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16775 bfd *abfd = reader->abfd;
16776 struct comp_unit_head *cu_header = &cu->header;
16777 unsigned int bytes_read;
16778 struct dwarf_block *blk;
16780 attr->form = (enum dwarf_form) form;
16783 case DW_FORM_ref_addr:
16784 if (cu->header.version == 2)
16785 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16787 DW_UNSND (attr) = read_offset (abfd, info_ptr,
16788 &cu->header, &bytes_read);
16789 info_ptr += bytes_read;
16791 case DW_FORM_GNU_ref_alt:
16792 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16793 info_ptr += bytes_read;
16796 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16797 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
16798 info_ptr += bytes_read;
16800 case DW_FORM_block2:
16801 blk = dwarf_alloc_block (cu);
16802 blk->size = read_2_bytes (abfd, info_ptr);
16804 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16805 info_ptr += blk->size;
16806 DW_BLOCK (attr) = blk;
16808 case DW_FORM_block4:
16809 blk = dwarf_alloc_block (cu);
16810 blk->size = read_4_bytes (abfd, info_ptr);
16812 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16813 info_ptr += blk->size;
16814 DW_BLOCK (attr) = blk;
16816 case DW_FORM_data2:
16817 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
16820 case DW_FORM_data4:
16821 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
16824 case DW_FORM_data8:
16825 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
16828 case DW_FORM_data16:
16829 blk = dwarf_alloc_block (cu);
16831 blk->data = read_n_bytes (abfd, info_ptr, 16);
16833 DW_BLOCK (attr) = blk;
16835 case DW_FORM_sec_offset:
16836 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16837 info_ptr += bytes_read;
16839 case DW_FORM_string:
16840 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
16841 DW_STRING_IS_CANONICAL (attr) = 0;
16842 info_ptr += bytes_read;
16845 if (!cu->per_cu->is_dwz)
16847 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
16849 DW_STRING_IS_CANONICAL (attr) = 0;
16850 info_ptr += bytes_read;
16854 case DW_FORM_line_strp:
16855 if (!cu->per_cu->is_dwz)
16857 DW_STRING (attr) = read_indirect_line_string (abfd, info_ptr,
16858 cu_header, &bytes_read);
16859 DW_STRING_IS_CANONICAL (attr) = 0;
16860 info_ptr += bytes_read;
16864 case DW_FORM_GNU_strp_alt:
16866 struct dwz_file *dwz = dwarf2_get_dwz_file ();
16867 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
16870 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
16871 DW_STRING_IS_CANONICAL (attr) = 0;
16872 info_ptr += bytes_read;
16875 case DW_FORM_exprloc:
16876 case DW_FORM_block:
16877 blk = dwarf_alloc_block (cu);
16878 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16879 info_ptr += bytes_read;
16880 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16881 info_ptr += blk->size;
16882 DW_BLOCK (attr) = blk;
16884 case DW_FORM_block1:
16885 blk = dwarf_alloc_block (cu);
16886 blk->size = read_1_byte (abfd, info_ptr);
16888 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16889 info_ptr += blk->size;
16890 DW_BLOCK (attr) = blk;
16892 case DW_FORM_data1:
16893 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16897 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16900 case DW_FORM_flag_present:
16901 DW_UNSND (attr) = 1;
16903 case DW_FORM_sdata:
16904 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
16905 info_ptr += bytes_read;
16907 case DW_FORM_udata:
16908 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16909 info_ptr += bytes_read;
16912 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16913 + read_1_byte (abfd, info_ptr));
16917 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16918 + read_2_bytes (abfd, info_ptr));
16922 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16923 + read_4_bytes (abfd, info_ptr));
16927 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16928 + read_8_bytes (abfd, info_ptr));
16931 case DW_FORM_ref_sig8:
16932 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
16935 case DW_FORM_ref_udata:
16936 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16937 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
16938 info_ptr += bytes_read;
16940 case DW_FORM_indirect:
16941 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16942 info_ptr += bytes_read;
16943 if (form == DW_FORM_implicit_const)
16945 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
16946 info_ptr += bytes_read;
16948 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
16951 case DW_FORM_implicit_const:
16952 DW_SND (attr) = implicit_const;
16954 case DW_FORM_GNU_addr_index:
16955 if (reader->dwo_file == NULL)
16957 /* For now flag a hard error.
16958 Later we can turn this into a complaint. */
16959 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16960 dwarf_form_name (form),
16961 bfd_get_filename (abfd));
16963 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
16964 info_ptr += bytes_read;
16966 case DW_FORM_GNU_str_index:
16967 if (reader->dwo_file == NULL)
16969 /* For now flag a hard error.
16970 Later we can turn this into a complaint if warranted. */
16971 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16972 dwarf_form_name (form),
16973 bfd_get_filename (abfd));
16976 ULONGEST str_index =
16977 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16979 DW_STRING (attr) = read_str_index (reader, str_index);
16980 DW_STRING_IS_CANONICAL (attr) = 0;
16981 info_ptr += bytes_read;
16985 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
16986 dwarf_form_name (form),
16987 bfd_get_filename (abfd));
16991 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
16992 attr->form = DW_FORM_GNU_ref_alt;
16994 /* We have seen instances where the compiler tried to emit a byte
16995 size attribute of -1 which ended up being encoded as an unsigned
16996 0xffffffff. Although 0xffffffff is technically a valid size value,
16997 an object of this size seems pretty unlikely so we can relatively
16998 safely treat these cases as if the size attribute was invalid and
16999 treat them as zero by default. */
17000 if (attr->name == DW_AT_byte_size
17001 && form == DW_FORM_data4
17002 && DW_UNSND (attr) >= 0xffffffff)
17005 (&symfile_complaints,
17006 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
17007 hex_string (DW_UNSND (attr)));
17008 DW_UNSND (attr) = 0;
17014 /* Read an attribute described by an abbreviated attribute. */
17016 static const gdb_byte *
17017 read_attribute (const struct die_reader_specs *reader,
17018 struct attribute *attr, struct attr_abbrev *abbrev,
17019 const gdb_byte *info_ptr)
17021 attr->name = abbrev->name;
17022 return read_attribute_value (reader, attr, abbrev->form,
17023 abbrev->implicit_const, info_ptr);
17026 /* Read dwarf information from a buffer. */
17028 static unsigned int
17029 read_1_byte (bfd *abfd, const gdb_byte *buf)
17031 return bfd_get_8 (abfd, buf);
17035 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
17037 return bfd_get_signed_8 (abfd, buf);
17040 static unsigned int
17041 read_2_bytes (bfd *abfd, const gdb_byte *buf)
17043 return bfd_get_16 (abfd, buf);
17047 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
17049 return bfd_get_signed_16 (abfd, buf);
17052 static unsigned int
17053 read_4_bytes (bfd *abfd, const gdb_byte *buf)
17055 return bfd_get_32 (abfd, buf);
17059 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
17061 return bfd_get_signed_32 (abfd, buf);
17065 read_8_bytes (bfd *abfd, const gdb_byte *buf)
17067 return bfd_get_64 (abfd, buf);
17071 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
17072 unsigned int *bytes_read)
17074 struct comp_unit_head *cu_header = &cu->header;
17075 CORE_ADDR retval = 0;
17077 if (cu_header->signed_addr_p)
17079 switch (cu_header->addr_size)
17082 retval = bfd_get_signed_16 (abfd, buf);
17085 retval = bfd_get_signed_32 (abfd, buf);
17088 retval = bfd_get_signed_64 (abfd, buf);
17091 internal_error (__FILE__, __LINE__,
17092 _("read_address: bad switch, signed [in module %s]"),
17093 bfd_get_filename (abfd));
17098 switch (cu_header->addr_size)
17101 retval = bfd_get_16 (abfd, buf);
17104 retval = bfd_get_32 (abfd, buf);
17107 retval = bfd_get_64 (abfd, buf);
17110 internal_error (__FILE__, __LINE__,
17111 _("read_address: bad switch, "
17112 "unsigned [in module %s]"),
17113 bfd_get_filename (abfd));
17117 *bytes_read = cu_header->addr_size;
17121 /* Read the initial length from a section. The (draft) DWARF 3
17122 specification allows the initial length to take up either 4 bytes
17123 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
17124 bytes describe the length and all offsets will be 8 bytes in length
17127 An older, non-standard 64-bit format is also handled by this
17128 function. The older format in question stores the initial length
17129 as an 8-byte quantity without an escape value. Lengths greater
17130 than 2^32 aren't very common which means that the initial 4 bytes
17131 is almost always zero. Since a length value of zero doesn't make
17132 sense for the 32-bit format, this initial zero can be considered to
17133 be an escape value which indicates the presence of the older 64-bit
17134 format. As written, the code can't detect (old format) lengths
17135 greater than 4GB. If it becomes necessary to handle lengths
17136 somewhat larger than 4GB, we could allow other small values (such
17137 as the non-sensical values of 1, 2, and 3) to also be used as
17138 escape values indicating the presence of the old format.
17140 The value returned via bytes_read should be used to increment the
17141 relevant pointer after calling read_initial_length().
17143 [ Note: read_initial_length() and read_offset() are based on the
17144 document entitled "DWARF Debugging Information Format", revision
17145 3, draft 8, dated November 19, 2001. This document was obtained
17148 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
17150 This document is only a draft and is subject to change. (So beware.)
17152 Details regarding the older, non-standard 64-bit format were
17153 determined empirically by examining 64-bit ELF files produced by
17154 the SGI toolchain on an IRIX 6.5 machine.
17156 - Kevin, July 16, 2002
17160 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
17162 LONGEST length = bfd_get_32 (abfd, buf);
17164 if (length == 0xffffffff)
17166 length = bfd_get_64 (abfd, buf + 4);
17169 else if (length == 0)
17171 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
17172 length = bfd_get_64 (abfd, buf);
17183 /* Cover function for read_initial_length.
17184 Returns the length of the object at BUF, and stores the size of the
17185 initial length in *BYTES_READ and stores the size that offsets will be in
17187 If the initial length size is not equivalent to that specified in
17188 CU_HEADER then issue a complaint.
17189 This is useful when reading non-comp-unit headers. */
17192 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
17193 const struct comp_unit_head *cu_header,
17194 unsigned int *bytes_read,
17195 unsigned int *offset_size)
17197 LONGEST length = read_initial_length (abfd, buf, bytes_read);
17199 gdb_assert (cu_header->initial_length_size == 4
17200 || cu_header->initial_length_size == 8
17201 || cu_header->initial_length_size == 12);
17203 if (cu_header->initial_length_size != *bytes_read)
17204 complaint (&symfile_complaints,
17205 _("intermixed 32-bit and 64-bit DWARF sections"));
17207 *offset_size = (*bytes_read == 4) ? 4 : 8;
17211 /* Read an offset from the data stream. The size of the offset is
17212 given by cu_header->offset_size. */
17215 read_offset (bfd *abfd, const gdb_byte *buf,
17216 const struct comp_unit_head *cu_header,
17217 unsigned int *bytes_read)
17219 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
17221 *bytes_read = cu_header->offset_size;
17225 /* Read an offset from the data stream. */
17228 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
17230 LONGEST retval = 0;
17232 switch (offset_size)
17235 retval = bfd_get_32 (abfd, buf);
17238 retval = bfd_get_64 (abfd, buf);
17241 internal_error (__FILE__, __LINE__,
17242 _("read_offset_1: bad switch [in module %s]"),
17243 bfd_get_filename (abfd));
17249 static const gdb_byte *
17250 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
17252 /* If the size of a host char is 8 bits, we can return a pointer
17253 to the buffer, otherwise we have to copy the data to a buffer
17254 allocated on the temporary obstack. */
17255 gdb_assert (HOST_CHAR_BIT == 8);
17259 static const char *
17260 read_direct_string (bfd *abfd, const gdb_byte *buf,
17261 unsigned int *bytes_read_ptr)
17263 /* If the size of a host char is 8 bits, we can return a pointer
17264 to the string, otherwise we have to copy the string to a buffer
17265 allocated on the temporary obstack. */
17266 gdb_assert (HOST_CHAR_BIT == 8);
17269 *bytes_read_ptr = 1;
17272 *bytes_read_ptr = strlen ((const char *) buf) + 1;
17273 return (const char *) buf;
17276 /* Return pointer to string at section SECT offset STR_OFFSET with error
17277 reporting strings FORM_NAME and SECT_NAME. */
17279 static const char *
17280 read_indirect_string_at_offset_from (bfd *abfd, LONGEST str_offset,
17281 struct dwarf2_section_info *sect,
17282 const char *form_name,
17283 const char *sect_name)
17285 dwarf2_read_section (dwarf2_per_objfile->objfile, sect);
17286 if (sect->buffer == NULL)
17287 error (_("%s used without %s section [in module %s]"),
17288 form_name, sect_name, bfd_get_filename (abfd));
17289 if (str_offset >= sect->size)
17290 error (_("%s pointing outside of %s section [in module %s]"),
17291 form_name, sect_name, bfd_get_filename (abfd));
17292 gdb_assert (HOST_CHAR_BIT == 8);
17293 if (sect->buffer[str_offset] == '\0')
17295 return (const char *) (sect->buffer + str_offset);
17298 /* Return pointer to string at .debug_str offset STR_OFFSET. */
17300 static const char *
17301 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
17303 return read_indirect_string_at_offset_from (abfd, str_offset,
17304 &dwarf2_per_objfile->str,
17305 "DW_FORM_strp", ".debug_str");
17308 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
17310 static const char *
17311 read_indirect_line_string_at_offset (bfd *abfd, LONGEST str_offset)
17313 return read_indirect_string_at_offset_from (abfd, str_offset,
17314 &dwarf2_per_objfile->line_str,
17315 "DW_FORM_line_strp",
17316 ".debug_line_str");
17319 /* Read a string at offset STR_OFFSET in the .debug_str section from
17320 the .dwz file DWZ. Throw an error if the offset is too large. If
17321 the string consists of a single NUL byte, return NULL; otherwise
17322 return a pointer to the string. */
17324 static const char *
17325 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
17327 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
17329 if (dwz->str.buffer == NULL)
17330 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
17331 "section [in module %s]"),
17332 bfd_get_filename (dwz->dwz_bfd));
17333 if (str_offset >= dwz->str.size)
17334 error (_("DW_FORM_GNU_strp_alt pointing outside of "
17335 ".debug_str section [in module %s]"),
17336 bfd_get_filename (dwz->dwz_bfd));
17337 gdb_assert (HOST_CHAR_BIT == 8);
17338 if (dwz->str.buffer[str_offset] == '\0')
17340 return (const char *) (dwz->str.buffer + str_offset);
17343 /* Return pointer to string at .debug_str offset as read from BUF.
17344 BUF is assumed to be in a compilation unit described by CU_HEADER.
17345 Return *BYTES_READ_PTR count of bytes read from BUF. */
17347 static const char *
17348 read_indirect_string (bfd *abfd, const gdb_byte *buf,
17349 const struct comp_unit_head *cu_header,
17350 unsigned int *bytes_read_ptr)
17352 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17354 return read_indirect_string_at_offset (abfd, str_offset);
17357 /* Return pointer to string at .debug_line_str offset as read from BUF.
17358 BUF is assumed to be in a compilation unit described by CU_HEADER.
17359 Return *BYTES_READ_PTR count of bytes read from BUF. */
17361 static const char *
17362 read_indirect_line_string (bfd *abfd, const gdb_byte *buf,
17363 const struct comp_unit_head *cu_header,
17364 unsigned int *bytes_read_ptr)
17366 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17368 return read_indirect_line_string_at_offset (abfd, str_offset);
17372 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
17373 unsigned int *bytes_read_ptr)
17376 unsigned int num_read;
17378 unsigned char byte;
17385 byte = bfd_get_8 (abfd, buf);
17388 result |= ((ULONGEST) (byte & 127) << shift);
17389 if ((byte & 128) == 0)
17395 *bytes_read_ptr = num_read;
17400 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
17401 unsigned int *bytes_read_ptr)
17404 int shift, num_read;
17405 unsigned char byte;
17412 byte = bfd_get_8 (abfd, buf);
17415 result |= ((LONGEST) (byte & 127) << shift);
17417 if ((byte & 128) == 0)
17422 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
17423 result |= -(((LONGEST) 1) << shift);
17424 *bytes_read_ptr = num_read;
17428 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
17429 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
17430 ADDR_SIZE is the size of addresses from the CU header. */
17433 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
17435 struct objfile *objfile = dwarf2_per_objfile->objfile;
17436 bfd *abfd = objfile->obfd;
17437 const gdb_byte *info_ptr;
17439 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
17440 if (dwarf2_per_objfile->addr.buffer == NULL)
17441 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
17442 objfile_name (objfile));
17443 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
17444 error (_("DW_FORM_addr_index pointing outside of "
17445 ".debug_addr section [in module %s]"),
17446 objfile_name (objfile));
17447 info_ptr = (dwarf2_per_objfile->addr.buffer
17448 + addr_base + addr_index * addr_size);
17449 if (addr_size == 4)
17450 return bfd_get_32 (abfd, info_ptr);
17452 return bfd_get_64 (abfd, info_ptr);
17455 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
17458 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
17460 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
17463 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
17466 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
17467 unsigned int *bytes_read)
17469 bfd *abfd = cu->objfile->obfd;
17470 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
17472 return read_addr_index (cu, addr_index);
17475 /* Data structure to pass results from dwarf2_read_addr_index_reader
17476 back to dwarf2_read_addr_index. */
17478 struct dwarf2_read_addr_index_data
17480 ULONGEST addr_base;
17484 /* die_reader_func for dwarf2_read_addr_index. */
17487 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
17488 const gdb_byte *info_ptr,
17489 struct die_info *comp_unit_die,
17493 struct dwarf2_cu *cu = reader->cu;
17494 struct dwarf2_read_addr_index_data *aidata =
17495 (struct dwarf2_read_addr_index_data *) data;
17497 aidata->addr_base = cu->addr_base;
17498 aidata->addr_size = cu->header.addr_size;
17501 /* Given an index in .debug_addr, fetch the value.
17502 NOTE: This can be called during dwarf expression evaluation,
17503 long after the debug information has been read, and thus per_cu->cu
17504 may no longer exist. */
17507 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
17508 unsigned int addr_index)
17510 struct objfile *objfile = per_cu->objfile;
17511 struct dwarf2_cu *cu = per_cu->cu;
17512 ULONGEST addr_base;
17515 /* This is intended to be called from outside this file. */
17516 dw2_setup (objfile);
17518 /* We need addr_base and addr_size.
17519 If we don't have PER_CU->cu, we have to get it.
17520 Nasty, but the alternative is storing the needed info in PER_CU,
17521 which at this point doesn't seem justified: it's not clear how frequently
17522 it would get used and it would increase the size of every PER_CU.
17523 Entry points like dwarf2_per_cu_addr_size do a similar thing
17524 so we're not in uncharted territory here.
17525 Alas we need to be a bit more complicated as addr_base is contained
17528 We don't need to read the entire CU(/TU).
17529 We just need the header and top level die.
17531 IWBN to use the aging mechanism to let us lazily later discard the CU.
17532 For now we skip this optimization. */
17536 addr_base = cu->addr_base;
17537 addr_size = cu->header.addr_size;
17541 struct dwarf2_read_addr_index_data aidata;
17543 /* Note: We can't use init_cutu_and_read_dies_simple here,
17544 we need addr_base. */
17545 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
17546 dwarf2_read_addr_index_reader, &aidata);
17547 addr_base = aidata.addr_base;
17548 addr_size = aidata.addr_size;
17551 return read_addr_index_1 (addr_index, addr_base, addr_size);
17554 /* Given a DW_FORM_GNU_str_index, fetch the string.
17555 This is only used by the Fission support. */
17557 static const char *
17558 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
17560 struct objfile *objfile = dwarf2_per_objfile->objfile;
17561 const char *objf_name = objfile_name (objfile);
17562 bfd *abfd = objfile->obfd;
17563 struct dwarf2_cu *cu = reader->cu;
17564 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
17565 struct dwarf2_section_info *str_offsets_section =
17566 &reader->dwo_file->sections.str_offsets;
17567 const gdb_byte *info_ptr;
17568 ULONGEST str_offset;
17569 static const char form_name[] = "DW_FORM_GNU_str_index";
17571 dwarf2_read_section (objfile, str_section);
17572 dwarf2_read_section (objfile, str_offsets_section);
17573 if (str_section->buffer == NULL)
17574 error (_("%s used without .debug_str.dwo section"
17575 " in CU at offset 0x%x [in module %s]"),
17576 form_name, to_underlying (cu->header.sect_off), objf_name);
17577 if (str_offsets_section->buffer == NULL)
17578 error (_("%s used without .debug_str_offsets.dwo section"
17579 " in CU at offset 0x%x [in module %s]"),
17580 form_name, to_underlying (cu->header.sect_off), objf_name);
17581 if (str_index * cu->header.offset_size >= str_offsets_section->size)
17582 error (_("%s pointing outside of .debug_str_offsets.dwo"
17583 " section in CU at offset 0x%x [in module %s]"),
17584 form_name, to_underlying (cu->header.sect_off), objf_name);
17585 info_ptr = (str_offsets_section->buffer
17586 + str_index * cu->header.offset_size);
17587 if (cu->header.offset_size == 4)
17588 str_offset = bfd_get_32 (abfd, info_ptr);
17590 str_offset = bfd_get_64 (abfd, info_ptr);
17591 if (str_offset >= str_section->size)
17592 error (_("Offset from %s pointing outside of"
17593 " .debug_str.dwo section in CU at offset 0x%x [in module %s]"),
17594 form_name, to_underlying (cu->header.sect_off), objf_name);
17595 return (const char *) (str_section->buffer + str_offset);
17598 /* Return the length of an LEB128 number in BUF. */
17601 leb128_size (const gdb_byte *buf)
17603 const gdb_byte *begin = buf;
17609 if ((byte & 128) == 0)
17610 return buf - begin;
17615 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
17624 cu->language = language_c;
17627 case DW_LANG_C_plus_plus:
17628 case DW_LANG_C_plus_plus_11:
17629 case DW_LANG_C_plus_plus_14:
17630 cu->language = language_cplus;
17633 cu->language = language_d;
17635 case DW_LANG_Fortran77:
17636 case DW_LANG_Fortran90:
17637 case DW_LANG_Fortran95:
17638 case DW_LANG_Fortran03:
17639 case DW_LANG_Fortran08:
17640 cu->language = language_fortran;
17643 cu->language = language_go;
17645 case DW_LANG_Mips_Assembler:
17646 cu->language = language_asm;
17648 case DW_LANG_Ada83:
17649 case DW_LANG_Ada95:
17650 cu->language = language_ada;
17652 case DW_LANG_Modula2:
17653 cu->language = language_m2;
17655 case DW_LANG_Pascal83:
17656 cu->language = language_pascal;
17659 cu->language = language_objc;
17662 case DW_LANG_Rust_old:
17663 cu->language = language_rust;
17665 case DW_LANG_Cobol74:
17666 case DW_LANG_Cobol85:
17668 cu->language = language_minimal;
17671 cu->language_defn = language_def (cu->language);
17674 /* Return the named attribute or NULL if not there. */
17676 static struct attribute *
17677 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17682 struct attribute *spec = NULL;
17684 for (i = 0; i < die->num_attrs; ++i)
17686 if (die->attrs[i].name == name)
17687 return &die->attrs[i];
17688 if (die->attrs[i].name == DW_AT_specification
17689 || die->attrs[i].name == DW_AT_abstract_origin)
17690 spec = &die->attrs[i];
17696 die = follow_die_ref (die, spec, &cu);
17702 /* Return the named attribute or NULL if not there,
17703 but do not follow DW_AT_specification, etc.
17704 This is for use in contexts where we're reading .debug_types dies.
17705 Following DW_AT_specification, DW_AT_abstract_origin will take us
17706 back up the chain, and we want to go down. */
17708 static struct attribute *
17709 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
17713 for (i = 0; i < die->num_attrs; ++i)
17714 if (die->attrs[i].name == name)
17715 return &die->attrs[i];
17720 /* Return the string associated with a string-typed attribute, or NULL if it
17721 is either not found or is of an incorrect type. */
17723 static const char *
17724 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17726 struct attribute *attr;
17727 const char *str = NULL;
17729 attr = dwarf2_attr (die, name, cu);
17733 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
17734 || attr->form == DW_FORM_string
17735 || attr->form == DW_FORM_GNU_str_index
17736 || attr->form == DW_FORM_GNU_strp_alt)
17737 str = DW_STRING (attr);
17739 complaint (&symfile_complaints,
17740 _("string type expected for attribute %s for "
17741 "DIE at 0x%x in module %s"),
17742 dwarf_attr_name (name), to_underlying (die->sect_off),
17743 objfile_name (cu->objfile));
17749 /* Return non-zero iff the attribute NAME is defined for the given DIE,
17750 and holds a non-zero value. This function should only be used for
17751 DW_FORM_flag or DW_FORM_flag_present attributes. */
17754 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
17756 struct attribute *attr = dwarf2_attr (die, name, cu);
17758 return (attr && DW_UNSND (attr));
17762 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
17764 /* A DIE is a declaration if it has a DW_AT_declaration attribute
17765 which value is non-zero. However, we have to be careful with
17766 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
17767 (via dwarf2_flag_true_p) follows this attribute. So we may
17768 end up accidently finding a declaration attribute that belongs
17769 to a different DIE referenced by the specification attribute,
17770 even though the given DIE does not have a declaration attribute. */
17771 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
17772 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
17775 /* Return the die giving the specification for DIE, if there is
17776 one. *SPEC_CU is the CU containing DIE on input, and the CU
17777 containing the return value on output. If there is no
17778 specification, but there is an abstract origin, that is
17781 static struct die_info *
17782 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
17784 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
17787 if (spec_attr == NULL)
17788 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
17790 if (spec_attr == NULL)
17793 return follow_die_ref (die, spec_attr, spec_cu);
17796 /* Stub for free_line_header to match void * callback types. */
17799 free_line_header_voidp (void *arg)
17801 struct line_header *lh = (struct line_header *) arg;
17807 line_header::add_include_dir (const char *include_dir)
17809 if (dwarf_line_debug >= 2)
17810 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
17811 include_dirs.size () + 1, include_dir);
17813 include_dirs.push_back (include_dir);
17817 line_header::add_file_name (const char *name,
17819 unsigned int mod_time,
17820 unsigned int length)
17822 if (dwarf_line_debug >= 2)
17823 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
17824 (unsigned) file_names.size () + 1, name);
17826 file_names.emplace_back (name, d_index, mod_time, length);
17829 /* A convenience function to find the proper .debug_line section for a CU. */
17831 static struct dwarf2_section_info *
17832 get_debug_line_section (struct dwarf2_cu *cu)
17834 struct dwarf2_section_info *section;
17836 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
17838 if (cu->dwo_unit && cu->per_cu->is_debug_types)
17839 section = &cu->dwo_unit->dwo_file->sections.line;
17840 else if (cu->per_cu->is_dwz)
17842 struct dwz_file *dwz = dwarf2_get_dwz_file ();
17844 section = &dwz->line;
17847 section = &dwarf2_per_objfile->line;
17852 /* Read directory or file name entry format, starting with byte of
17853 format count entries, ULEB128 pairs of entry formats, ULEB128 of
17854 entries count and the entries themselves in the described entry
17858 read_formatted_entries (bfd *abfd, const gdb_byte **bufp,
17859 struct line_header *lh,
17860 const struct comp_unit_head *cu_header,
17861 void (*callback) (struct line_header *lh,
17864 unsigned int mod_time,
17865 unsigned int length))
17867 gdb_byte format_count, formati;
17868 ULONGEST data_count, datai;
17869 const gdb_byte *buf = *bufp;
17870 const gdb_byte *format_header_data;
17872 unsigned int bytes_read;
17874 format_count = read_1_byte (abfd, buf);
17876 format_header_data = buf;
17877 for (formati = 0; formati < format_count; formati++)
17879 read_unsigned_leb128 (abfd, buf, &bytes_read);
17881 read_unsigned_leb128 (abfd, buf, &bytes_read);
17885 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
17887 for (datai = 0; datai < data_count; datai++)
17889 const gdb_byte *format = format_header_data;
17890 struct file_entry fe;
17892 for (formati = 0; formati < format_count; formati++)
17894 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
17895 format += bytes_read;
17897 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
17898 format += bytes_read;
17900 gdb::optional<const char *> string;
17901 gdb::optional<unsigned int> uint;
17905 case DW_FORM_string:
17906 string.emplace (read_direct_string (abfd, buf, &bytes_read));
17910 case DW_FORM_line_strp:
17911 string.emplace (read_indirect_line_string (abfd, buf,
17917 case DW_FORM_data1:
17918 uint.emplace (read_1_byte (abfd, buf));
17922 case DW_FORM_data2:
17923 uint.emplace (read_2_bytes (abfd, buf));
17927 case DW_FORM_data4:
17928 uint.emplace (read_4_bytes (abfd, buf));
17932 case DW_FORM_data8:
17933 uint.emplace (read_8_bytes (abfd, buf));
17937 case DW_FORM_udata:
17938 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
17942 case DW_FORM_block:
17943 /* It is valid only for DW_LNCT_timestamp which is ignored by
17948 switch (content_type)
17951 if (string.has_value ())
17954 case DW_LNCT_directory_index:
17955 if (uint.has_value ())
17956 fe.d_index = (dir_index) *uint;
17958 case DW_LNCT_timestamp:
17959 if (uint.has_value ())
17960 fe.mod_time = *uint;
17963 if (uint.has_value ())
17969 complaint (&symfile_complaints,
17970 _("Unknown format content type %s"),
17971 pulongest (content_type));
17975 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
17981 /* Read the statement program header starting at OFFSET in
17982 .debug_line, or .debug_line.dwo. Return a pointer
17983 to a struct line_header, allocated using xmalloc.
17984 Returns NULL if there is a problem reading the header, e.g., if it
17985 has a version we don't understand.
17987 NOTE: the strings in the include directory and file name tables of
17988 the returned object point into the dwarf line section buffer,
17989 and must not be freed. */
17991 static line_header_up
17992 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
17994 const gdb_byte *line_ptr;
17995 unsigned int bytes_read, offset_size;
17997 const char *cur_dir, *cur_file;
17998 struct dwarf2_section_info *section;
18001 section = get_debug_line_section (cu);
18002 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
18003 if (section->buffer == NULL)
18005 if (cu->dwo_unit && cu->per_cu->is_debug_types)
18006 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
18008 complaint (&symfile_complaints, _("missing .debug_line section"));
18012 /* We can't do this until we know the section is non-empty.
18013 Only then do we know we have such a section. */
18014 abfd = get_section_bfd_owner (section);
18016 /* Make sure that at least there's room for the total_length field.
18017 That could be 12 bytes long, but we're just going to fudge that. */
18018 if (to_underlying (sect_off) + 4 >= section->size)
18020 dwarf2_statement_list_fits_in_line_number_section_complaint ();
18024 line_header_up lh (new line_header ());
18026 lh->sect_off = sect_off;
18027 lh->offset_in_dwz = cu->per_cu->is_dwz;
18029 line_ptr = section->buffer + to_underlying (sect_off);
18031 /* Read in the header. */
18033 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
18034 &bytes_read, &offset_size);
18035 line_ptr += bytes_read;
18036 if (line_ptr + lh->total_length > (section->buffer + section->size))
18038 dwarf2_statement_list_fits_in_line_number_section_complaint ();
18041 lh->statement_program_end = line_ptr + lh->total_length;
18042 lh->version = read_2_bytes (abfd, line_ptr);
18044 if (lh->version > 5)
18046 /* This is a version we don't understand. The format could have
18047 changed in ways we don't handle properly so just punt. */
18048 complaint (&symfile_complaints,
18049 _("unsupported version in .debug_line section"));
18052 if (lh->version >= 5)
18054 gdb_byte segment_selector_size;
18056 /* Skip address size. */
18057 read_1_byte (abfd, line_ptr);
18060 segment_selector_size = read_1_byte (abfd, line_ptr);
18062 if (segment_selector_size != 0)
18064 complaint (&symfile_complaints,
18065 _("unsupported segment selector size %u "
18066 "in .debug_line section"),
18067 segment_selector_size);
18071 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
18072 line_ptr += offset_size;
18073 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
18075 if (lh->version >= 4)
18077 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
18081 lh->maximum_ops_per_instruction = 1;
18083 if (lh->maximum_ops_per_instruction == 0)
18085 lh->maximum_ops_per_instruction = 1;
18086 complaint (&symfile_complaints,
18087 _("invalid maximum_ops_per_instruction "
18088 "in `.debug_line' section"));
18091 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
18093 lh->line_base = read_1_signed_byte (abfd, line_ptr);
18095 lh->line_range = read_1_byte (abfd, line_ptr);
18097 lh->opcode_base = read_1_byte (abfd, line_ptr);
18099 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
18101 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
18102 for (i = 1; i < lh->opcode_base; ++i)
18104 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
18108 if (lh->version >= 5)
18110 /* Read directory table. */
18111 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18112 [] (struct line_header *lh, const char *name,
18113 dir_index d_index, unsigned int mod_time,
18114 unsigned int length)
18116 lh->add_include_dir (name);
18119 /* Read file name table. */
18120 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18121 [] (struct line_header *lh, const char *name,
18122 dir_index d_index, unsigned int mod_time,
18123 unsigned int length)
18125 lh->add_file_name (name, d_index, mod_time, length);
18130 /* Read directory table. */
18131 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
18133 line_ptr += bytes_read;
18134 lh->add_include_dir (cur_dir);
18136 line_ptr += bytes_read;
18138 /* Read file name table. */
18139 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
18141 unsigned int mod_time, length;
18144 line_ptr += bytes_read;
18145 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18146 line_ptr += bytes_read;
18147 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18148 line_ptr += bytes_read;
18149 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18150 line_ptr += bytes_read;
18152 lh->add_file_name (cur_file, d_index, mod_time, length);
18154 line_ptr += bytes_read;
18156 lh->statement_program_start = line_ptr;
18158 if (line_ptr > (section->buffer + section->size))
18159 complaint (&symfile_complaints,
18160 _("line number info header doesn't "
18161 "fit in `.debug_line' section"));
18166 /* Subroutine of dwarf_decode_lines to simplify it.
18167 Return the file name of the psymtab for included file FILE_INDEX
18168 in line header LH of PST.
18169 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
18170 If space for the result is malloc'd, it will be freed by a cleanup.
18171 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
18173 The function creates dangling cleanup registration. */
18175 static const char *
18176 psymtab_include_file_name (const struct line_header *lh, int file_index,
18177 const struct partial_symtab *pst,
18178 const char *comp_dir)
18180 const file_entry &fe = lh->file_names[file_index];
18181 const char *include_name = fe.name;
18182 const char *include_name_to_compare = include_name;
18183 const char *pst_filename;
18184 char *copied_name = NULL;
18187 const char *dir_name = fe.include_dir (lh);
18189 if (!IS_ABSOLUTE_PATH (include_name)
18190 && (dir_name != NULL || comp_dir != NULL))
18192 /* Avoid creating a duplicate psymtab for PST.
18193 We do this by comparing INCLUDE_NAME and PST_FILENAME.
18194 Before we do the comparison, however, we need to account
18195 for DIR_NAME and COMP_DIR.
18196 First prepend dir_name (if non-NULL). If we still don't
18197 have an absolute path prepend comp_dir (if non-NULL).
18198 However, the directory we record in the include-file's
18199 psymtab does not contain COMP_DIR (to match the
18200 corresponding symtab(s)).
18205 bash$ gcc -g ./hello.c
18206 include_name = "hello.c"
18208 DW_AT_comp_dir = comp_dir = "/tmp"
18209 DW_AT_name = "./hello.c"
18213 if (dir_name != NULL)
18215 char *tem = concat (dir_name, SLASH_STRING,
18216 include_name, (char *)NULL);
18218 make_cleanup (xfree, tem);
18219 include_name = tem;
18220 include_name_to_compare = include_name;
18222 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
18224 char *tem = concat (comp_dir, SLASH_STRING,
18225 include_name, (char *)NULL);
18227 make_cleanup (xfree, tem);
18228 include_name_to_compare = tem;
18232 pst_filename = pst->filename;
18233 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
18235 copied_name = concat (pst->dirname, SLASH_STRING,
18236 pst_filename, (char *)NULL);
18237 pst_filename = copied_name;
18240 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
18242 if (copied_name != NULL)
18243 xfree (copied_name);
18247 return include_name;
18250 /* State machine to track the state of the line number program. */
18252 class lnp_state_machine
18255 /* Initialize a machine state for the start of a line number
18257 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
18259 file_entry *current_file ()
18261 /* lh->file_names is 0-based, but the file name numbers in the
18262 statement program are 1-based. */
18263 return m_line_header->file_name_at (m_file);
18266 /* Record the line in the state machine. END_SEQUENCE is true if
18267 we're processing the end of a sequence. */
18268 void record_line (bool end_sequence);
18270 /* Check address and if invalid nop-out the rest of the lines in this
18272 void check_line_address (struct dwarf2_cu *cu,
18273 const gdb_byte *line_ptr,
18274 CORE_ADDR lowpc, CORE_ADDR address);
18276 void handle_set_discriminator (unsigned int discriminator)
18278 m_discriminator = discriminator;
18279 m_line_has_non_zero_discriminator |= discriminator != 0;
18282 /* Handle DW_LNE_set_address. */
18283 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
18286 address += baseaddr;
18287 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
18290 /* Handle DW_LNS_advance_pc. */
18291 void handle_advance_pc (CORE_ADDR adjust);
18293 /* Handle a special opcode. */
18294 void handle_special_opcode (unsigned char op_code);
18296 /* Handle DW_LNS_advance_line. */
18297 void handle_advance_line (int line_delta)
18299 advance_line (line_delta);
18302 /* Handle DW_LNS_set_file. */
18303 void handle_set_file (file_name_index file);
18305 /* Handle DW_LNS_negate_stmt. */
18306 void handle_negate_stmt ()
18308 m_is_stmt = !m_is_stmt;
18311 /* Handle DW_LNS_const_add_pc. */
18312 void handle_const_add_pc ();
18314 /* Handle DW_LNS_fixed_advance_pc. */
18315 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
18317 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18321 /* Handle DW_LNS_copy. */
18322 void handle_copy ()
18324 record_line (false);
18325 m_discriminator = 0;
18328 /* Handle DW_LNE_end_sequence. */
18329 void handle_end_sequence ()
18331 m_record_line_callback = ::record_line;
18335 /* Advance the line by LINE_DELTA. */
18336 void advance_line (int line_delta)
18338 m_line += line_delta;
18340 if (line_delta != 0)
18341 m_line_has_non_zero_discriminator = m_discriminator != 0;
18344 gdbarch *m_gdbarch;
18346 /* True if we're recording lines.
18347 Otherwise we're building partial symtabs and are just interested in
18348 finding include files mentioned by the line number program. */
18349 bool m_record_lines_p;
18351 /* The line number header. */
18352 line_header *m_line_header;
18354 /* These are part of the standard DWARF line number state machine,
18355 and initialized according to the DWARF spec. */
18357 unsigned char m_op_index = 0;
18358 /* The line table index (1-based) of the current file. */
18359 file_name_index m_file = (file_name_index) 1;
18360 unsigned int m_line = 1;
18362 /* These are initialized in the constructor. */
18364 CORE_ADDR m_address;
18366 unsigned int m_discriminator;
18368 /* Additional bits of state we need to track. */
18370 /* The last file that we called dwarf2_start_subfile for.
18371 This is only used for TLLs. */
18372 unsigned int m_last_file = 0;
18373 /* The last file a line number was recorded for. */
18374 struct subfile *m_last_subfile = NULL;
18376 /* The function to call to record a line. */
18377 record_line_ftype *m_record_line_callback = NULL;
18379 /* The last line number that was recorded, used to coalesce
18380 consecutive entries for the same line. This can happen, for
18381 example, when discriminators are present. PR 17276. */
18382 unsigned int m_last_line = 0;
18383 bool m_line_has_non_zero_discriminator = false;
18387 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
18389 CORE_ADDR addr_adj = (((m_op_index + adjust)
18390 / m_line_header->maximum_ops_per_instruction)
18391 * m_line_header->minimum_instruction_length);
18392 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18393 m_op_index = ((m_op_index + adjust)
18394 % m_line_header->maximum_ops_per_instruction);
18398 lnp_state_machine::handle_special_opcode (unsigned char op_code)
18400 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
18401 CORE_ADDR addr_adj = (((m_op_index
18402 + (adj_opcode / m_line_header->line_range))
18403 / m_line_header->maximum_ops_per_instruction)
18404 * m_line_header->minimum_instruction_length);
18405 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18406 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
18407 % m_line_header->maximum_ops_per_instruction);
18409 int line_delta = (m_line_header->line_base
18410 + (adj_opcode % m_line_header->line_range));
18411 advance_line (line_delta);
18412 record_line (false);
18413 m_discriminator = 0;
18417 lnp_state_machine::handle_set_file (file_name_index file)
18421 const file_entry *fe = current_file ();
18423 dwarf2_debug_line_missing_file_complaint ();
18424 else if (m_record_lines_p)
18426 const char *dir = fe->include_dir (m_line_header);
18428 m_last_subfile = current_subfile;
18429 m_line_has_non_zero_discriminator = m_discriminator != 0;
18430 dwarf2_start_subfile (fe->name, dir);
18435 lnp_state_machine::handle_const_add_pc ()
18438 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
18441 = (((m_op_index + adjust)
18442 / m_line_header->maximum_ops_per_instruction)
18443 * m_line_header->minimum_instruction_length);
18445 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18446 m_op_index = ((m_op_index + adjust)
18447 % m_line_header->maximum_ops_per_instruction);
18450 /* Ignore this record_line request. */
18453 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
18458 /* Return non-zero if we should add LINE to the line number table.
18459 LINE is the line to add, LAST_LINE is the last line that was added,
18460 LAST_SUBFILE is the subfile for LAST_LINE.
18461 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
18462 had a non-zero discriminator.
18464 We have to be careful in the presence of discriminators.
18465 E.g., for this line:
18467 for (i = 0; i < 100000; i++);
18469 clang can emit four line number entries for that one line,
18470 each with a different discriminator.
18471 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
18473 However, we want gdb to coalesce all four entries into one.
18474 Otherwise the user could stepi into the middle of the line and
18475 gdb would get confused about whether the pc really was in the
18476 middle of the line.
18478 Things are further complicated by the fact that two consecutive
18479 line number entries for the same line is a heuristic used by gcc
18480 to denote the end of the prologue. So we can't just discard duplicate
18481 entries, we have to be selective about it. The heuristic we use is
18482 that we only collapse consecutive entries for the same line if at least
18483 one of those entries has a non-zero discriminator. PR 17276.
18485 Note: Addresses in the line number state machine can never go backwards
18486 within one sequence, thus this coalescing is ok. */
18489 dwarf_record_line_p (unsigned int line, unsigned int last_line,
18490 int line_has_non_zero_discriminator,
18491 struct subfile *last_subfile)
18493 if (current_subfile != last_subfile)
18495 if (line != last_line)
18497 /* Same line for the same file that we've seen already.
18498 As a last check, for pr 17276, only record the line if the line
18499 has never had a non-zero discriminator. */
18500 if (!line_has_non_zero_discriminator)
18505 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
18506 in the line table of subfile SUBFILE. */
18509 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
18510 unsigned int line, CORE_ADDR address,
18511 record_line_ftype p_record_line)
18513 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
18515 if (dwarf_line_debug)
18517 fprintf_unfiltered (gdb_stdlog,
18518 "Recording line %u, file %s, address %s\n",
18519 line, lbasename (subfile->name),
18520 paddress (gdbarch, address));
18523 (*p_record_line) (subfile, line, addr);
18526 /* Subroutine of dwarf_decode_lines_1 to simplify it.
18527 Mark the end of a set of line number records.
18528 The arguments are the same as for dwarf_record_line_1.
18529 If SUBFILE is NULL the request is ignored. */
18532 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
18533 CORE_ADDR address, record_line_ftype p_record_line)
18535 if (subfile == NULL)
18538 if (dwarf_line_debug)
18540 fprintf_unfiltered (gdb_stdlog,
18541 "Finishing current line, file %s, address %s\n",
18542 lbasename (subfile->name),
18543 paddress (gdbarch, address));
18546 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
18550 lnp_state_machine::record_line (bool end_sequence)
18552 if (dwarf_line_debug)
18554 fprintf_unfiltered (gdb_stdlog,
18555 "Processing actual line %u: file %u,"
18556 " address %s, is_stmt %u, discrim %u\n",
18557 m_line, to_underlying (m_file),
18558 paddress (m_gdbarch, m_address),
18559 m_is_stmt, m_discriminator);
18562 file_entry *fe = current_file ();
18565 dwarf2_debug_line_missing_file_complaint ();
18566 /* For now we ignore lines not starting on an instruction boundary.
18567 But not when processing end_sequence for compatibility with the
18568 previous version of the code. */
18569 else if (m_op_index == 0 || end_sequence)
18571 fe->included_p = 1;
18572 if (m_record_lines_p && m_is_stmt)
18574 if (m_last_subfile != current_subfile || end_sequence)
18576 dwarf_finish_line (m_gdbarch, m_last_subfile,
18577 m_address, m_record_line_callback);
18582 if (dwarf_record_line_p (m_line, m_last_line,
18583 m_line_has_non_zero_discriminator,
18586 dwarf_record_line_1 (m_gdbarch, current_subfile,
18588 m_record_line_callback);
18590 m_last_subfile = current_subfile;
18591 m_last_line = m_line;
18597 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
18598 bool record_lines_p)
18601 m_record_lines_p = record_lines_p;
18602 m_line_header = lh;
18604 m_record_line_callback = ::record_line;
18606 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
18607 was a line entry for it so that the backend has a chance to adjust it
18608 and also record it in case it needs it. This is currently used by MIPS
18609 code, cf. `mips_adjust_dwarf2_line'. */
18610 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
18611 m_is_stmt = lh->default_is_stmt;
18612 m_discriminator = 0;
18616 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
18617 const gdb_byte *line_ptr,
18618 CORE_ADDR lowpc, CORE_ADDR address)
18620 /* If address < lowpc then it's not a usable value, it's outside the
18621 pc range of the CU. However, we restrict the test to only address
18622 values of zero to preserve GDB's previous behaviour which is to
18623 handle the specific case of a function being GC'd by the linker. */
18625 if (address == 0 && address < lowpc)
18627 /* This line table is for a function which has been
18628 GCd by the linker. Ignore it. PR gdb/12528 */
18630 struct objfile *objfile = cu->objfile;
18631 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
18633 complaint (&symfile_complaints,
18634 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
18635 line_offset, objfile_name (objfile));
18636 m_record_line_callback = noop_record_line;
18637 /* Note: record_line_callback is left as noop_record_line until
18638 we see DW_LNE_end_sequence. */
18642 /* Subroutine of dwarf_decode_lines to simplify it.
18643 Process the line number information in LH.
18644 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
18645 program in order to set included_p for every referenced header. */
18648 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
18649 const int decode_for_pst_p, CORE_ADDR lowpc)
18651 const gdb_byte *line_ptr, *extended_end;
18652 const gdb_byte *line_end;
18653 unsigned int bytes_read, extended_len;
18654 unsigned char op_code, extended_op;
18655 CORE_ADDR baseaddr;
18656 struct objfile *objfile = cu->objfile;
18657 bfd *abfd = objfile->obfd;
18658 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18659 /* True if we're recording line info (as opposed to building partial
18660 symtabs and just interested in finding include files mentioned by
18661 the line number program). */
18662 bool record_lines_p = !decode_for_pst_p;
18664 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
18666 line_ptr = lh->statement_program_start;
18667 line_end = lh->statement_program_end;
18669 /* Read the statement sequences until there's nothing left. */
18670 while (line_ptr < line_end)
18672 /* The DWARF line number program state machine. Reset the state
18673 machine at the start of each sequence. */
18674 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
18675 bool end_sequence = false;
18677 if (record_lines_p)
18679 /* Start a subfile for the current file of the state
18681 const file_entry *fe = state_machine.current_file ();
18684 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
18687 /* Decode the table. */
18688 while (line_ptr < line_end && !end_sequence)
18690 op_code = read_1_byte (abfd, line_ptr);
18693 if (op_code >= lh->opcode_base)
18695 /* Special opcode. */
18696 state_machine.handle_special_opcode (op_code);
18698 else switch (op_code)
18700 case DW_LNS_extended_op:
18701 extended_len = read_unsigned_leb128 (abfd, line_ptr,
18703 line_ptr += bytes_read;
18704 extended_end = line_ptr + extended_len;
18705 extended_op = read_1_byte (abfd, line_ptr);
18707 switch (extended_op)
18709 case DW_LNE_end_sequence:
18710 state_machine.handle_end_sequence ();
18711 end_sequence = true;
18713 case DW_LNE_set_address:
18716 = read_address (abfd, line_ptr, cu, &bytes_read);
18717 line_ptr += bytes_read;
18719 state_machine.check_line_address (cu, line_ptr,
18721 state_machine.handle_set_address (baseaddr, address);
18724 case DW_LNE_define_file:
18726 const char *cur_file;
18727 unsigned int mod_time, length;
18730 cur_file = read_direct_string (abfd, line_ptr,
18732 line_ptr += bytes_read;
18733 dindex = (dir_index)
18734 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18735 line_ptr += bytes_read;
18737 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18738 line_ptr += bytes_read;
18740 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18741 line_ptr += bytes_read;
18742 lh->add_file_name (cur_file, dindex, mod_time, length);
18745 case DW_LNE_set_discriminator:
18747 /* The discriminator is not interesting to the
18748 debugger; just ignore it. We still need to
18749 check its value though:
18750 if there are consecutive entries for the same
18751 (non-prologue) line we want to coalesce them.
18754 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18755 line_ptr += bytes_read;
18757 state_machine.handle_set_discriminator (discr);
18761 complaint (&symfile_complaints,
18762 _("mangled .debug_line section"));
18765 /* Make sure that we parsed the extended op correctly. If e.g.
18766 we expected a different address size than the producer used,
18767 we may have read the wrong number of bytes. */
18768 if (line_ptr != extended_end)
18770 complaint (&symfile_complaints,
18771 _("mangled .debug_line section"));
18776 state_machine.handle_copy ();
18778 case DW_LNS_advance_pc:
18781 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18782 line_ptr += bytes_read;
18784 state_machine.handle_advance_pc (adjust);
18787 case DW_LNS_advance_line:
18790 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
18791 line_ptr += bytes_read;
18793 state_machine.handle_advance_line (line_delta);
18796 case DW_LNS_set_file:
18798 file_name_index file
18799 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
18801 line_ptr += bytes_read;
18803 state_machine.handle_set_file (file);
18806 case DW_LNS_set_column:
18807 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18808 line_ptr += bytes_read;
18810 case DW_LNS_negate_stmt:
18811 state_machine.handle_negate_stmt ();
18813 case DW_LNS_set_basic_block:
18815 /* Add to the address register of the state machine the
18816 address increment value corresponding to special opcode
18817 255. I.e., this value is scaled by the minimum
18818 instruction length since special opcode 255 would have
18819 scaled the increment. */
18820 case DW_LNS_const_add_pc:
18821 state_machine.handle_const_add_pc ();
18823 case DW_LNS_fixed_advance_pc:
18825 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
18828 state_machine.handle_fixed_advance_pc (addr_adj);
18833 /* Unknown standard opcode, ignore it. */
18836 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
18838 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18839 line_ptr += bytes_read;
18846 dwarf2_debug_line_missing_end_sequence_complaint ();
18848 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
18849 in which case we still finish recording the last line). */
18850 state_machine.record_line (true);
18854 /* Decode the Line Number Program (LNP) for the given line_header
18855 structure and CU. The actual information extracted and the type
18856 of structures created from the LNP depends on the value of PST.
18858 1. If PST is NULL, then this procedure uses the data from the program
18859 to create all necessary symbol tables, and their linetables.
18861 2. If PST is not NULL, this procedure reads the program to determine
18862 the list of files included by the unit represented by PST, and
18863 builds all the associated partial symbol tables.
18865 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
18866 It is used for relative paths in the line table.
18867 NOTE: When processing partial symtabs (pst != NULL),
18868 comp_dir == pst->dirname.
18870 NOTE: It is important that psymtabs have the same file name (via strcmp)
18871 as the corresponding symtab. Since COMP_DIR is not used in the name of the
18872 symtab we don't use it in the name of the psymtabs we create.
18873 E.g. expand_line_sal requires this when finding psymtabs to expand.
18874 A good testcase for this is mb-inline.exp.
18876 LOWPC is the lowest address in CU (or 0 if not known).
18878 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
18879 for its PC<->lines mapping information. Otherwise only the filename
18880 table is read in. */
18883 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
18884 struct dwarf2_cu *cu, struct partial_symtab *pst,
18885 CORE_ADDR lowpc, int decode_mapping)
18887 struct objfile *objfile = cu->objfile;
18888 const int decode_for_pst_p = (pst != NULL);
18890 if (decode_mapping)
18891 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
18893 if (decode_for_pst_p)
18897 /* Now that we're done scanning the Line Header Program, we can
18898 create the psymtab of each included file. */
18899 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
18900 if (lh->file_names[file_index].included_p == 1)
18902 const char *include_name =
18903 psymtab_include_file_name (lh, file_index, pst, comp_dir);
18904 if (include_name != NULL)
18905 dwarf2_create_include_psymtab (include_name, pst, objfile);
18910 /* Make sure a symtab is created for every file, even files
18911 which contain only variables (i.e. no code with associated
18913 struct compunit_symtab *cust = buildsym_compunit_symtab ();
18916 for (i = 0; i < lh->file_names.size (); i++)
18918 file_entry &fe = lh->file_names[i];
18920 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
18922 if (current_subfile->symtab == NULL)
18924 current_subfile->symtab
18925 = allocate_symtab (cust, current_subfile->name);
18927 fe.symtab = current_subfile->symtab;
18932 /* Start a subfile for DWARF. FILENAME is the name of the file and
18933 DIRNAME the name of the source directory which contains FILENAME
18934 or NULL if not known.
18935 This routine tries to keep line numbers from identical absolute and
18936 relative file names in a common subfile.
18938 Using the `list' example from the GDB testsuite, which resides in
18939 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
18940 of /srcdir/list0.c yields the following debugging information for list0.c:
18942 DW_AT_name: /srcdir/list0.c
18943 DW_AT_comp_dir: /compdir
18944 files.files[0].name: list0.h
18945 files.files[0].dir: /srcdir
18946 files.files[1].name: list0.c
18947 files.files[1].dir: /srcdir
18949 The line number information for list0.c has to end up in a single
18950 subfile, so that `break /srcdir/list0.c:1' works as expected.
18951 start_subfile will ensure that this happens provided that we pass the
18952 concatenation of files.files[1].dir and files.files[1].name as the
18956 dwarf2_start_subfile (const char *filename, const char *dirname)
18960 /* In order not to lose the line information directory,
18961 we concatenate it to the filename when it makes sense.
18962 Note that the Dwarf3 standard says (speaking of filenames in line
18963 information): ``The directory index is ignored for file names
18964 that represent full path names''. Thus ignoring dirname in the
18965 `else' branch below isn't an issue. */
18967 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
18969 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
18973 start_subfile (filename);
18979 /* Start a symtab for DWARF.
18980 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
18982 static struct compunit_symtab *
18983 dwarf2_start_symtab (struct dwarf2_cu *cu,
18984 const char *name, const char *comp_dir, CORE_ADDR low_pc)
18986 struct compunit_symtab *cust
18987 = start_symtab (cu->objfile, name, comp_dir, low_pc);
18989 record_debugformat ("DWARF 2");
18990 record_producer (cu->producer);
18992 /* We assume that we're processing GCC output. */
18993 processing_gcc_compilation = 2;
18995 cu->processing_has_namespace_info = 0;
19001 var_decode_location (struct attribute *attr, struct symbol *sym,
19002 struct dwarf2_cu *cu)
19004 struct objfile *objfile = cu->objfile;
19005 struct comp_unit_head *cu_header = &cu->header;
19007 /* NOTE drow/2003-01-30: There used to be a comment and some special
19008 code here to turn a symbol with DW_AT_external and a
19009 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
19010 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
19011 with some versions of binutils) where shared libraries could have
19012 relocations against symbols in their debug information - the
19013 minimal symbol would have the right address, but the debug info
19014 would not. It's no longer necessary, because we will explicitly
19015 apply relocations when we read in the debug information now. */
19017 /* A DW_AT_location attribute with no contents indicates that a
19018 variable has been optimized away. */
19019 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
19021 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
19025 /* Handle one degenerate form of location expression specially, to
19026 preserve GDB's previous behavior when section offsets are
19027 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
19028 then mark this symbol as LOC_STATIC. */
19030 if (attr_form_is_block (attr)
19031 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
19032 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
19033 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
19034 && (DW_BLOCK (attr)->size
19035 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
19037 unsigned int dummy;
19039 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
19040 SYMBOL_VALUE_ADDRESS (sym) =
19041 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
19043 SYMBOL_VALUE_ADDRESS (sym) =
19044 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
19045 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
19046 fixup_symbol_section (sym, objfile);
19047 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
19048 SYMBOL_SECTION (sym));
19052 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
19053 expression evaluator, and use LOC_COMPUTED only when necessary
19054 (i.e. when the value of a register or memory location is
19055 referenced, or a thread-local block, etc.). Then again, it might
19056 not be worthwhile. I'm assuming that it isn't unless performance
19057 or memory numbers show me otherwise. */
19059 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
19061 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
19062 cu->has_loclist = 1;
19065 /* Given a pointer to a DWARF information entry, figure out if we need
19066 to make a symbol table entry for it, and if so, create a new entry
19067 and return a pointer to it.
19068 If TYPE is NULL, determine symbol type from the die, otherwise
19069 used the passed type.
19070 If SPACE is not NULL, use it to hold the new symbol. If it is
19071 NULL, allocate a new symbol on the objfile's obstack. */
19073 static struct symbol *
19074 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
19075 struct symbol *space)
19077 struct objfile *objfile = cu->objfile;
19078 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19079 struct symbol *sym = NULL;
19081 struct attribute *attr = NULL;
19082 struct attribute *attr2 = NULL;
19083 CORE_ADDR baseaddr;
19084 struct pending **list_to_add = NULL;
19086 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
19088 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
19090 name = dwarf2_name (die, cu);
19093 const char *linkagename;
19094 int suppress_add = 0;
19099 sym = allocate_symbol (objfile);
19100 OBJSTAT (objfile, n_syms++);
19102 /* Cache this symbol's name and the name's demangled form (if any). */
19103 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
19104 linkagename = dwarf2_physname (name, die, cu);
19105 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
19107 /* Fortran does not have mangling standard and the mangling does differ
19108 between gfortran, iFort etc. */
19109 if (cu->language == language_fortran
19110 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
19111 symbol_set_demangled_name (&(sym->ginfo),
19112 dwarf2_full_name (name, die, cu),
19115 /* Default assumptions.
19116 Use the passed type or decode it from the die. */
19117 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19118 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
19120 SYMBOL_TYPE (sym) = type;
19122 SYMBOL_TYPE (sym) = die_type (die, cu);
19123 attr = dwarf2_attr (die,
19124 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
19128 SYMBOL_LINE (sym) = DW_UNSND (attr);
19131 attr = dwarf2_attr (die,
19132 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
19136 file_name_index file_index = (file_name_index) DW_UNSND (attr);
19137 struct file_entry *fe;
19139 if (cu->line_header != NULL)
19140 fe = cu->line_header->file_name_at (file_index);
19145 complaint (&symfile_complaints,
19146 _("file index out of range"));
19148 symbol_set_symtab (sym, fe->symtab);
19154 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
19159 addr = attr_value_as_address (attr);
19160 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
19161 SYMBOL_VALUE_ADDRESS (sym) = addr;
19163 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
19164 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
19165 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
19166 add_symbol_to_list (sym, cu->list_in_scope);
19168 case DW_TAG_subprogram:
19169 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
19171 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
19172 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19173 if ((attr2 && (DW_UNSND (attr2) != 0))
19174 || cu->language == language_ada)
19176 /* Subprograms marked external are stored as a global symbol.
19177 Ada subprograms, whether marked external or not, are always
19178 stored as a global symbol, because we want to be able to
19179 access them globally. For instance, we want to be able
19180 to break on a nested subprogram without having to
19181 specify the context. */
19182 list_to_add = &global_symbols;
19186 list_to_add = cu->list_in_scope;
19189 case DW_TAG_inlined_subroutine:
19190 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
19192 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
19193 SYMBOL_INLINED (sym) = 1;
19194 list_to_add = cu->list_in_scope;
19196 case DW_TAG_template_value_param:
19198 /* Fall through. */
19199 case DW_TAG_constant:
19200 case DW_TAG_variable:
19201 case DW_TAG_member:
19202 /* Compilation with minimal debug info may result in
19203 variables with missing type entries. Change the
19204 misleading `void' type to something sensible. */
19205 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
19206 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
19208 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19209 /* In the case of DW_TAG_member, we should only be called for
19210 static const members. */
19211 if (die->tag == DW_TAG_member)
19213 /* dwarf2_add_field uses die_is_declaration,
19214 so we do the same. */
19215 gdb_assert (die_is_declaration (die, cu));
19220 dwarf2_const_value (attr, sym, cu);
19221 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19224 if (attr2 && (DW_UNSND (attr2) != 0))
19225 list_to_add = &global_symbols;
19227 list_to_add = cu->list_in_scope;
19231 attr = dwarf2_attr (die, DW_AT_location, cu);
19234 var_decode_location (attr, sym, cu);
19235 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19237 /* Fortran explicitly imports any global symbols to the local
19238 scope by DW_TAG_common_block. */
19239 if (cu->language == language_fortran && die->parent
19240 && die->parent->tag == DW_TAG_common_block)
19243 if (SYMBOL_CLASS (sym) == LOC_STATIC
19244 && SYMBOL_VALUE_ADDRESS (sym) == 0
19245 && !dwarf2_per_objfile->has_section_at_zero)
19247 /* When a static variable is eliminated by the linker,
19248 the corresponding debug information is not stripped
19249 out, but the variable address is set to null;
19250 do not add such variables into symbol table. */
19252 else if (attr2 && (DW_UNSND (attr2) != 0))
19254 /* Workaround gfortran PR debug/40040 - it uses
19255 DW_AT_location for variables in -fPIC libraries which may
19256 get overriden by other libraries/executable and get
19257 a different address. Resolve it by the minimal symbol
19258 which may come from inferior's executable using copy
19259 relocation. Make this workaround only for gfortran as for
19260 other compilers GDB cannot guess the minimal symbol
19261 Fortran mangling kind. */
19262 if (cu->language == language_fortran && die->parent
19263 && die->parent->tag == DW_TAG_module
19265 && startswith (cu->producer, "GNU Fortran"))
19266 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19268 /* A variable with DW_AT_external is never static,
19269 but it may be block-scoped. */
19270 list_to_add = (cu->list_in_scope == &file_symbols
19271 ? &global_symbols : cu->list_in_scope);
19274 list_to_add = cu->list_in_scope;
19278 /* We do not know the address of this symbol.
19279 If it is an external symbol and we have type information
19280 for it, enter the symbol as a LOC_UNRESOLVED symbol.
19281 The address of the variable will then be determined from
19282 the minimal symbol table whenever the variable is
19284 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19286 /* Fortran explicitly imports any global symbols to the local
19287 scope by DW_TAG_common_block. */
19288 if (cu->language == language_fortran && die->parent
19289 && die->parent->tag == DW_TAG_common_block)
19291 /* SYMBOL_CLASS doesn't matter here because
19292 read_common_block is going to reset it. */
19294 list_to_add = cu->list_in_scope;
19296 else if (attr2 && (DW_UNSND (attr2) != 0)
19297 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
19299 /* A variable with DW_AT_external is never static, but it
19300 may be block-scoped. */
19301 list_to_add = (cu->list_in_scope == &file_symbols
19302 ? &global_symbols : cu->list_in_scope);
19304 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19306 else if (!die_is_declaration (die, cu))
19308 /* Use the default LOC_OPTIMIZED_OUT class. */
19309 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
19311 list_to_add = cu->list_in_scope;
19315 case DW_TAG_formal_parameter:
19316 /* If we are inside a function, mark this as an argument. If
19317 not, we might be looking at an argument to an inlined function
19318 when we do not have enough information to show inlined frames;
19319 pretend it's a local variable in that case so that the user can
19321 if (context_stack_depth > 0
19322 && context_stack[context_stack_depth - 1].name != NULL)
19323 SYMBOL_IS_ARGUMENT (sym) = 1;
19324 attr = dwarf2_attr (die, DW_AT_location, cu);
19327 var_decode_location (attr, sym, cu);
19329 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19332 dwarf2_const_value (attr, sym, cu);
19335 list_to_add = cu->list_in_scope;
19337 case DW_TAG_unspecified_parameters:
19338 /* From varargs functions; gdb doesn't seem to have any
19339 interest in this information, so just ignore it for now.
19342 case DW_TAG_template_type_param:
19344 /* Fall through. */
19345 case DW_TAG_class_type:
19346 case DW_TAG_interface_type:
19347 case DW_TAG_structure_type:
19348 case DW_TAG_union_type:
19349 case DW_TAG_set_type:
19350 case DW_TAG_enumeration_type:
19351 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19352 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
19355 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
19356 really ever be static objects: otherwise, if you try
19357 to, say, break of a class's method and you're in a file
19358 which doesn't mention that class, it won't work unless
19359 the check for all static symbols in lookup_symbol_aux
19360 saves you. See the OtherFileClass tests in
19361 gdb.c++/namespace.exp. */
19365 list_to_add = (cu->list_in_scope == &file_symbols
19366 && cu->language == language_cplus
19367 ? &global_symbols : cu->list_in_scope);
19369 /* The semantics of C++ state that "struct foo {
19370 ... }" also defines a typedef for "foo". */
19371 if (cu->language == language_cplus
19372 || cu->language == language_ada
19373 || cu->language == language_d
19374 || cu->language == language_rust)
19376 /* The symbol's name is already allocated along
19377 with this objfile, so we don't need to
19378 duplicate it for the type. */
19379 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
19380 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
19385 case DW_TAG_typedef:
19386 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19387 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19388 list_to_add = cu->list_in_scope;
19390 case DW_TAG_base_type:
19391 case DW_TAG_subrange_type:
19392 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19393 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19394 list_to_add = cu->list_in_scope;
19396 case DW_TAG_enumerator:
19397 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19400 dwarf2_const_value (attr, sym, cu);
19403 /* NOTE: carlton/2003-11-10: See comment above in the
19404 DW_TAG_class_type, etc. block. */
19406 list_to_add = (cu->list_in_scope == &file_symbols
19407 && cu->language == language_cplus
19408 ? &global_symbols : cu->list_in_scope);
19411 case DW_TAG_imported_declaration:
19412 case DW_TAG_namespace:
19413 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19414 list_to_add = &global_symbols;
19416 case DW_TAG_module:
19417 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19418 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
19419 list_to_add = &global_symbols;
19421 case DW_TAG_common_block:
19422 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
19423 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
19424 add_symbol_to_list (sym, cu->list_in_scope);
19427 /* Not a tag we recognize. Hopefully we aren't processing
19428 trash data, but since we must specifically ignore things
19429 we don't recognize, there is nothing else we should do at
19431 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
19432 dwarf_tag_name (die->tag));
19438 sym->hash_next = objfile->template_symbols;
19439 objfile->template_symbols = sym;
19440 list_to_add = NULL;
19443 if (list_to_add != NULL)
19444 add_symbol_to_list (sym, list_to_add);
19446 /* For the benefit of old versions of GCC, check for anonymous
19447 namespaces based on the demangled name. */
19448 if (!cu->processing_has_namespace_info
19449 && cu->language == language_cplus)
19450 cp_scan_for_anonymous_namespaces (sym, objfile);
19455 /* A wrapper for new_symbol_full that always allocates a new symbol. */
19457 static struct symbol *
19458 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
19460 return new_symbol_full (die, type, cu, NULL);
19463 /* Given an attr with a DW_FORM_dataN value in host byte order,
19464 zero-extend it as appropriate for the symbol's type. The DWARF
19465 standard (v4) is not entirely clear about the meaning of using
19466 DW_FORM_dataN for a constant with a signed type, where the type is
19467 wider than the data. The conclusion of a discussion on the DWARF
19468 list was that this is unspecified. We choose to always zero-extend
19469 because that is the interpretation long in use by GCC. */
19472 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
19473 struct dwarf2_cu *cu, LONGEST *value, int bits)
19475 struct objfile *objfile = cu->objfile;
19476 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
19477 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
19478 LONGEST l = DW_UNSND (attr);
19480 if (bits < sizeof (*value) * 8)
19482 l &= ((LONGEST) 1 << bits) - 1;
19485 else if (bits == sizeof (*value) * 8)
19489 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
19490 store_unsigned_integer (bytes, bits / 8, byte_order, l);
19497 /* Read a constant value from an attribute. Either set *VALUE, or if
19498 the value does not fit in *VALUE, set *BYTES - either already
19499 allocated on the objfile obstack, or newly allocated on OBSTACK,
19500 or, set *BATON, if we translated the constant to a location
19504 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
19505 const char *name, struct obstack *obstack,
19506 struct dwarf2_cu *cu,
19507 LONGEST *value, const gdb_byte **bytes,
19508 struct dwarf2_locexpr_baton **baton)
19510 struct objfile *objfile = cu->objfile;
19511 struct comp_unit_head *cu_header = &cu->header;
19512 struct dwarf_block *blk;
19513 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
19514 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
19520 switch (attr->form)
19523 case DW_FORM_GNU_addr_index:
19527 if (TYPE_LENGTH (type) != cu_header->addr_size)
19528 dwarf2_const_value_length_mismatch_complaint (name,
19529 cu_header->addr_size,
19530 TYPE_LENGTH (type));
19531 /* Symbols of this form are reasonably rare, so we just
19532 piggyback on the existing location code rather than writing
19533 a new implementation of symbol_computed_ops. */
19534 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
19535 (*baton)->per_cu = cu->per_cu;
19536 gdb_assert ((*baton)->per_cu);
19538 (*baton)->size = 2 + cu_header->addr_size;
19539 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
19540 (*baton)->data = data;
19542 data[0] = DW_OP_addr;
19543 store_unsigned_integer (&data[1], cu_header->addr_size,
19544 byte_order, DW_ADDR (attr));
19545 data[cu_header->addr_size + 1] = DW_OP_stack_value;
19548 case DW_FORM_string:
19550 case DW_FORM_GNU_str_index:
19551 case DW_FORM_GNU_strp_alt:
19552 /* DW_STRING is already allocated on the objfile obstack, point
19554 *bytes = (const gdb_byte *) DW_STRING (attr);
19556 case DW_FORM_block1:
19557 case DW_FORM_block2:
19558 case DW_FORM_block4:
19559 case DW_FORM_block:
19560 case DW_FORM_exprloc:
19561 case DW_FORM_data16:
19562 blk = DW_BLOCK (attr);
19563 if (TYPE_LENGTH (type) != blk->size)
19564 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
19565 TYPE_LENGTH (type));
19566 *bytes = blk->data;
19569 /* The DW_AT_const_value attributes are supposed to carry the
19570 symbol's value "represented as it would be on the target
19571 architecture." By the time we get here, it's already been
19572 converted to host endianness, so we just need to sign- or
19573 zero-extend it as appropriate. */
19574 case DW_FORM_data1:
19575 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
19577 case DW_FORM_data2:
19578 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
19580 case DW_FORM_data4:
19581 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
19583 case DW_FORM_data8:
19584 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
19587 case DW_FORM_sdata:
19588 case DW_FORM_implicit_const:
19589 *value = DW_SND (attr);
19592 case DW_FORM_udata:
19593 *value = DW_UNSND (attr);
19597 complaint (&symfile_complaints,
19598 _("unsupported const value attribute form: '%s'"),
19599 dwarf_form_name (attr->form));
19606 /* Copy constant value from an attribute to a symbol. */
19609 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
19610 struct dwarf2_cu *cu)
19612 struct objfile *objfile = cu->objfile;
19614 const gdb_byte *bytes;
19615 struct dwarf2_locexpr_baton *baton;
19617 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
19618 SYMBOL_PRINT_NAME (sym),
19619 &objfile->objfile_obstack, cu,
19620 &value, &bytes, &baton);
19624 SYMBOL_LOCATION_BATON (sym) = baton;
19625 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
19627 else if (bytes != NULL)
19629 SYMBOL_VALUE_BYTES (sym) = bytes;
19630 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
19634 SYMBOL_VALUE (sym) = value;
19635 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
19639 /* Return the type of the die in question using its DW_AT_type attribute. */
19641 static struct type *
19642 die_type (struct die_info *die, struct dwarf2_cu *cu)
19644 struct attribute *type_attr;
19646 type_attr = dwarf2_attr (die, DW_AT_type, cu);
19649 /* A missing DW_AT_type represents a void type. */
19650 return objfile_type (cu->objfile)->builtin_void;
19653 return lookup_die_type (die, type_attr, cu);
19656 /* True iff CU's producer generates GNAT Ada auxiliary information
19657 that allows to find parallel types through that information instead
19658 of having to do expensive parallel lookups by type name. */
19661 need_gnat_info (struct dwarf2_cu *cu)
19663 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
19664 of GNAT produces this auxiliary information, without any indication
19665 that it is produced. Part of enhancing the FSF version of GNAT
19666 to produce that information will be to put in place an indicator
19667 that we can use in order to determine whether the descriptive type
19668 info is available or not. One suggestion that has been made is
19669 to use a new attribute, attached to the CU die. For now, assume
19670 that the descriptive type info is not available. */
19674 /* Return the auxiliary type of the die in question using its
19675 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
19676 attribute is not present. */
19678 static struct type *
19679 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
19681 struct attribute *type_attr;
19683 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
19687 return lookup_die_type (die, type_attr, cu);
19690 /* If DIE has a descriptive_type attribute, then set the TYPE's
19691 descriptive type accordingly. */
19694 set_descriptive_type (struct type *type, struct die_info *die,
19695 struct dwarf2_cu *cu)
19697 struct type *descriptive_type = die_descriptive_type (die, cu);
19699 if (descriptive_type)
19701 ALLOCATE_GNAT_AUX_TYPE (type);
19702 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
19706 /* Return the containing type of the die in question using its
19707 DW_AT_containing_type attribute. */
19709 static struct type *
19710 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
19712 struct attribute *type_attr;
19714 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
19716 error (_("Dwarf Error: Problem turning containing type into gdb type "
19717 "[in module %s]"), objfile_name (cu->objfile));
19719 return lookup_die_type (die, type_attr, cu);
19722 /* Return an error marker type to use for the ill formed type in DIE/CU. */
19724 static struct type *
19725 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
19727 struct objfile *objfile = dwarf2_per_objfile->objfile;
19728 char *message, *saved;
19730 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
19731 objfile_name (objfile),
19732 to_underlying (cu->header.sect_off),
19733 to_underlying (die->sect_off));
19734 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
19735 message, strlen (message));
19738 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
19741 /* Look up the type of DIE in CU using its type attribute ATTR.
19742 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
19743 DW_AT_containing_type.
19744 If there is no type substitute an error marker. */
19746 static struct type *
19747 lookup_die_type (struct die_info *die, const struct attribute *attr,
19748 struct dwarf2_cu *cu)
19750 struct objfile *objfile = cu->objfile;
19751 struct type *this_type;
19753 gdb_assert (attr->name == DW_AT_type
19754 || attr->name == DW_AT_GNAT_descriptive_type
19755 || attr->name == DW_AT_containing_type);
19757 /* First see if we have it cached. */
19759 if (attr->form == DW_FORM_GNU_ref_alt)
19761 struct dwarf2_per_cu_data *per_cu;
19762 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
19764 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1, cu->objfile);
19765 this_type = get_die_type_at_offset (sect_off, per_cu);
19767 else if (attr_form_is_ref (attr))
19769 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
19771 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
19773 else if (attr->form == DW_FORM_ref_sig8)
19775 ULONGEST signature = DW_SIGNATURE (attr);
19777 return get_signatured_type (die, signature, cu);
19781 complaint (&symfile_complaints,
19782 _("Dwarf Error: Bad type attribute %s in DIE"
19783 " at 0x%x [in module %s]"),
19784 dwarf_attr_name (attr->name), to_underlying (die->sect_off),
19785 objfile_name (objfile));
19786 return build_error_marker_type (cu, die);
19789 /* If not cached we need to read it in. */
19791 if (this_type == NULL)
19793 struct die_info *type_die = NULL;
19794 struct dwarf2_cu *type_cu = cu;
19796 if (attr_form_is_ref (attr))
19797 type_die = follow_die_ref (die, attr, &type_cu);
19798 if (type_die == NULL)
19799 return build_error_marker_type (cu, die);
19800 /* If we find the type now, it's probably because the type came
19801 from an inter-CU reference and the type's CU got expanded before
19803 this_type = read_type_die (type_die, type_cu);
19806 /* If we still don't have a type use an error marker. */
19808 if (this_type == NULL)
19809 return build_error_marker_type (cu, die);
19814 /* Return the type in DIE, CU.
19815 Returns NULL for invalid types.
19817 This first does a lookup in die_type_hash,
19818 and only reads the die in if necessary.
19820 NOTE: This can be called when reading in partial or full symbols. */
19822 static struct type *
19823 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
19825 struct type *this_type;
19827 this_type = get_die_type (die, cu);
19831 return read_type_die_1 (die, cu);
19834 /* Read the type in DIE, CU.
19835 Returns NULL for invalid types. */
19837 static struct type *
19838 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
19840 struct type *this_type = NULL;
19844 case DW_TAG_class_type:
19845 case DW_TAG_interface_type:
19846 case DW_TAG_structure_type:
19847 case DW_TAG_union_type:
19848 this_type = read_structure_type (die, cu);
19850 case DW_TAG_enumeration_type:
19851 this_type = read_enumeration_type (die, cu);
19853 case DW_TAG_subprogram:
19854 case DW_TAG_subroutine_type:
19855 case DW_TAG_inlined_subroutine:
19856 this_type = read_subroutine_type (die, cu);
19858 case DW_TAG_array_type:
19859 this_type = read_array_type (die, cu);
19861 case DW_TAG_set_type:
19862 this_type = read_set_type (die, cu);
19864 case DW_TAG_pointer_type:
19865 this_type = read_tag_pointer_type (die, cu);
19867 case DW_TAG_ptr_to_member_type:
19868 this_type = read_tag_ptr_to_member_type (die, cu);
19870 case DW_TAG_reference_type:
19871 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
19873 case DW_TAG_rvalue_reference_type:
19874 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
19876 case DW_TAG_const_type:
19877 this_type = read_tag_const_type (die, cu);
19879 case DW_TAG_volatile_type:
19880 this_type = read_tag_volatile_type (die, cu);
19882 case DW_TAG_restrict_type:
19883 this_type = read_tag_restrict_type (die, cu);
19885 case DW_TAG_string_type:
19886 this_type = read_tag_string_type (die, cu);
19888 case DW_TAG_typedef:
19889 this_type = read_typedef (die, cu);
19891 case DW_TAG_subrange_type:
19892 this_type = read_subrange_type (die, cu);
19894 case DW_TAG_base_type:
19895 this_type = read_base_type (die, cu);
19897 case DW_TAG_unspecified_type:
19898 this_type = read_unspecified_type (die, cu);
19900 case DW_TAG_namespace:
19901 this_type = read_namespace_type (die, cu);
19903 case DW_TAG_module:
19904 this_type = read_module_type (die, cu);
19906 case DW_TAG_atomic_type:
19907 this_type = read_tag_atomic_type (die, cu);
19910 complaint (&symfile_complaints,
19911 _("unexpected tag in read_type_die: '%s'"),
19912 dwarf_tag_name (die->tag));
19919 /* See if we can figure out if the class lives in a namespace. We do
19920 this by looking for a member function; its demangled name will
19921 contain namespace info, if there is any.
19922 Return the computed name or NULL.
19923 Space for the result is allocated on the objfile's obstack.
19924 This is the full-die version of guess_partial_die_structure_name.
19925 In this case we know DIE has no useful parent. */
19928 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
19930 struct die_info *spec_die;
19931 struct dwarf2_cu *spec_cu;
19932 struct die_info *child;
19935 spec_die = die_specification (die, &spec_cu);
19936 if (spec_die != NULL)
19942 for (child = die->child;
19944 child = child->sibling)
19946 if (child->tag == DW_TAG_subprogram)
19948 const char *linkage_name = dw2_linkage_name (child, cu);
19950 if (linkage_name != NULL)
19953 = language_class_name_from_physname (cu->language_defn,
19957 if (actual_name != NULL)
19959 const char *die_name = dwarf2_name (die, cu);
19961 if (die_name != NULL
19962 && strcmp (die_name, actual_name) != 0)
19964 /* Strip off the class name from the full name.
19965 We want the prefix. */
19966 int die_name_len = strlen (die_name);
19967 int actual_name_len = strlen (actual_name);
19969 /* Test for '::' as a sanity check. */
19970 if (actual_name_len > die_name_len + 2
19971 && actual_name[actual_name_len
19972 - die_name_len - 1] == ':')
19973 name = (char *) obstack_copy0 (
19974 &cu->objfile->per_bfd->storage_obstack,
19975 actual_name, actual_name_len - die_name_len - 2);
19978 xfree (actual_name);
19987 /* GCC might emit a nameless typedef that has a linkage name. Determine the
19988 prefix part in such case. See
19989 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19991 static const char *
19992 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
19994 struct attribute *attr;
19997 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
19998 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
20001 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
20004 attr = dw2_linkage_name_attr (die, cu);
20005 if (attr == NULL || DW_STRING (attr) == NULL)
20008 /* dwarf2_name had to be already called. */
20009 gdb_assert (DW_STRING_IS_CANONICAL (attr));
20011 /* Strip the base name, keep any leading namespaces/classes. */
20012 base = strrchr (DW_STRING (attr), ':');
20013 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
20016 return (char *) obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
20018 &base[-1] - DW_STRING (attr));
20021 /* Return the name of the namespace/class that DIE is defined within,
20022 or "" if we can't tell. The caller should not xfree the result.
20024 For example, if we're within the method foo() in the following
20034 then determine_prefix on foo's die will return "N::C". */
20036 static const char *
20037 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
20039 struct die_info *parent, *spec_die;
20040 struct dwarf2_cu *spec_cu;
20041 struct type *parent_type;
20042 const char *retval;
20044 if (cu->language != language_cplus
20045 && cu->language != language_fortran && cu->language != language_d
20046 && cu->language != language_rust)
20049 retval = anonymous_struct_prefix (die, cu);
20053 /* We have to be careful in the presence of DW_AT_specification.
20054 For example, with GCC 3.4, given the code
20058 // Definition of N::foo.
20062 then we'll have a tree of DIEs like this:
20064 1: DW_TAG_compile_unit
20065 2: DW_TAG_namespace // N
20066 3: DW_TAG_subprogram // declaration of N::foo
20067 4: DW_TAG_subprogram // definition of N::foo
20068 DW_AT_specification // refers to die #3
20070 Thus, when processing die #4, we have to pretend that we're in
20071 the context of its DW_AT_specification, namely the contex of die
20074 spec_die = die_specification (die, &spec_cu);
20075 if (spec_die == NULL)
20076 parent = die->parent;
20079 parent = spec_die->parent;
20083 if (parent == NULL)
20085 else if (parent->building_fullname)
20088 const char *parent_name;
20090 /* It has been seen on RealView 2.2 built binaries,
20091 DW_TAG_template_type_param types actually _defined_ as
20092 children of the parent class:
20095 template class <class Enum> Class{};
20096 Class<enum E> class_e;
20098 1: DW_TAG_class_type (Class)
20099 2: DW_TAG_enumeration_type (E)
20100 3: DW_TAG_enumerator (enum1:0)
20101 3: DW_TAG_enumerator (enum2:1)
20103 2: DW_TAG_template_type_param
20104 DW_AT_type DW_FORM_ref_udata (E)
20106 Besides being broken debug info, it can put GDB into an
20107 infinite loop. Consider:
20109 When we're building the full name for Class<E>, we'll start
20110 at Class, and go look over its template type parameters,
20111 finding E. We'll then try to build the full name of E, and
20112 reach here. We're now trying to build the full name of E,
20113 and look over the parent DIE for containing scope. In the
20114 broken case, if we followed the parent DIE of E, we'd again
20115 find Class, and once again go look at its template type
20116 arguments, etc., etc. Simply don't consider such parent die
20117 as source-level parent of this die (it can't be, the language
20118 doesn't allow it), and break the loop here. */
20119 name = dwarf2_name (die, cu);
20120 parent_name = dwarf2_name (parent, cu);
20121 complaint (&symfile_complaints,
20122 _("template param type '%s' defined within parent '%s'"),
20123 name ? name : "<unknown>",
20124 parent_name ? parent_name : "<unknown>");
20128 switch (parent->tag)
20130 case DW_TAG_namespace:
20131 parent_type = read_type_die (parent, cu);
20132 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
20133 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
20134 Work around this problem here. */
20135 if (cu->language == language_cplus
20136 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
20138 /* We give a name to even anonymous namespaces. */
20139 return TYPE_TAG_NAME (parent_type);
20140 case DW_TAG_class_type:
20141 case DW_TAG_interface_type:
20142 case DW_TAG_structure_type:
20143 case DW_TAG_union_type:
20144 case DW_TAG_module:
20145 parent_type = read_type_die (parent, cu);
20146 if (TYPE_TAG_NAME (parent_type) != NULL)
20147 return TYPE_TAG_NAME (parent_type);
20149 /* An anonymous structure is only allowed non-static data
20150 members; no typedefs, no member functions, et cetera.
20151 So it does not need a prefix. */
20153 case DW_TAG_compile_unit:
20154 case DW_TAG_partial_unit:
20155 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
20156 if (cu->language == language_cplus
20157 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
20158 && die->child != NULL
20159 && (die->tag == DW_TAG_class_type
20160 || die->tag == DW_TAG_structure_type
20161 || die->tag == DW_TAG_union_type))
20163 char *name = guess_full_die_structure_name (die, cu);
20168 case DW_TAG_enumeration_type:
20169 parent_type = read_type_die (parent, cu);
20170 if (TYPE_DECLARED_CLASS (parent_type))
20172 if (TYPE_TAG_NAME (parent_type) != NULL)
20173 return TYPE_TAG_NAME (parent_type);
20176 /* Fall through. */
20178 return determine_prefix (parent, cu);
20182 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
20183 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
20184 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
20185 an obconcat, otherwise allocate storage for the result. The CU argument is
20186 used to determine the language and hence, the appropriate separator. */
20188 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
20191 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
20192 int physname, struct dwarf2_cu *cu)
20194 const char *lead = "";
20197 if (suffix == NULL || suffix[0] == '\0'
20198 || prefix == NULL || prefix[0] == '\0')
20200 else if (cu->language == language_d)
20202 /* For D, the 'main' function could be defined in any module, but it
20203 should never be prefixed. */
20204 if (strcmp (suffix, "D main") == 0)
20212 else if (cu->language == language_fortran && physname)
20214 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
20215 DW_AT_MIPS_linkage_name is preferred and used instead. */
20223 if (prefix == NULL)
20225 if (suffix == NULL)
20232 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
20234 strcpy (retval, lead);
20235 strcat (retval, prefix);
20236 strcat (retval, sep);
20237 strcat (retval, suffix);
20242 /* We have an obstack. */
20243 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
20247 /* Return sibling of die, NULL if no sibling. */
20249 static struct die_info *
20250 sibling_die (struct die_info *die)
20252 return die->sibling;
20255 /* Get name of a die, return NULL if not found. */
20257 static const char *
20258 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
20259 struct obstack *obstack)
20261 if (name && cu->language == language_cplus)
20263 std::string canon_name = cp_canonicalize_string (name);
20265 if (!canon_name.empty ())
20267 if (canon_name != name)
20268 name = (const char *) obstack_copy0 (obstack,
20269 canon_name.c_str (),
20270 canon_name.length ());
20277 /* Get name of a die, return NULL if not found.
20278 Anonymous namespaces are converted to their magic string. */
20280 static const char *
20281 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
20283 struct attribute *attr;
20285 attr = dwarf2_attr (die, DW_AT_name, cu);
20286 if ((!attr || !DW_STRING (attr))
20287 && die->tag != DW_TAG_namespace
20288 && die->tag != DW_TAG_class_type
20289 && die->tag != DW_TAG_interface_type
20290 && die->tag != DW_TAG_structure_type
20291 && die->tag != DW_TAG_union_type)
20296 case DW_TAG_compile_unit:
20297 case DW_TAG_partial_unit:
20298 /* Compilation units have a DW_AT_name that is a filename, not
20299 a source language identifier. */
20300 case DW_TAG_enumeration_type:
20301 case DW_TAG_enumerator:
20302 /* These tags always have simple identifiers already; no need
20303 to canonicalize them. */
20304 return DW_STRING (attr);
20306 case DW_TAG_namespace:
20307 if (attr != NULL && DW_STRING (attr) != NULL)
20308 return DW_STRING (attr);
20309 return CP_ANONYMOUS_NAMESPACE_STR;
20311 case DW_TAG_class_type:
20312 case DW_TAG_interface_type:
20313 case DW_TAG_structure_type:
20314 case DW_TAG_union_type:
20315 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
20316 structures or unions. These were of the form "._%d" in GCC 4.1,
20317 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
20318 and GCC 4.4. We work around this problem by ignoring these. */
20319 if (attr && DW_STRING (attr)
20320 && (startswith (DW_STRING (attr), "._")
20321 || startswith (DW_STRING (attr), "<anonymous")))
20324 /* GCC might emit a nameless typedef that has a linkage name. See
20325 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
20326 if (!attr || DW_STRING (attr) == NULL)
20328 char *demangled = NULL;
20330 attr = dw2_linkage_name_attr (die, cu);
20331 if (attr == NULL || DW_STRING (attr) == NULL)
20334 /* Avoid demangling DW_STRING (attr) the second time on a second
20335 call for the same DIE. */
20336 if (!DW_STRING_IS_CANONICAL (attr))
20337 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
20343 /* FIXME: we already did this for the partial symbol... */
20346 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
20347 demangled, strlen (demangled)));
20348 DW_STRING_IS_CANONICAL (attr) = 1;
20351 /* Strip any leading namespaces/classes, keep only the base name.
20352 DW_AT_name for named DIEs does not contain the prefixes. */
20353 base = strrchr (DW_STRING (attr), ':');
20354 if (base && base > DW_STRING (attr) && base[-1] == ':')
20357 return DW_STRING (attr);
20366 if (!DW_STRING_IS_CANONICAL (attr))
20369 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
20370 &cu->objfile->per_bfd->storage_obstack);
20371 DW_STRING_IS_CANONICAL (attr) = 1;
20373 return DW_STRING (attr);
20376 /* Return the die that this die in an extension of, or NULL if there
20377 is none. *EXT_CU is the CU containing DIE on input, and the CU
20378 containing the return value on output. */
20380 static struct die_info *
20381 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
20383 struct attribute *attr;
20385 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
20389 return follow_die_ref (die, attr, ext_cu);
20392 /* Convert a DIE tag into its string name. */
20394 static const char *
20395 dwarf_tag_name (unsigned tag)
20397 const char *name = get_DW_TAG_name (tag);
20400 return "DW_TAG_<unknown>";
20405 /* Convert a DWARF attribute code into its string name. */
20407 static const char *
20408 dwarf_attr_name (unsigned attr)
20412 #ifdef MIPS /* collides with DW_AT_HP_block_index */
20413 if (attr == DW_AT_MIPS_fde)
20414 return "DW_AT_MIPS_fde";
20416 if (attr == DW_AT_HP_block_index)
20417 return "DW_AT_HP_block_index";
20420 name = get_DW_AT_name (attr);
20423 return "DW_AT_<unknown>";
20428 /* Convert a DWARF value form code into its string name. */
20430 static const char *
20431 dwarf_form_name (unsigned form)
20433 const char *name = get_DW_FORM_name (form);
20436 return "DW_FORM_<unknown>";
20441 static const char *
20442 dwarf_bool_name (unsigned mybool)
20450 /* Convert a DWARF type code into its string name. */
20452 static const char *
20453 dwarf_type_encoding_name (unsigned enc)
20455 const char *name = get_DW_ATE_name (enc);
20458 return "DW_ATE_<unknown>";
20464 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
20468 print_spaces (indent, f);
20469 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
20470 dwarf_tag_name (die->tag), die->abbrev,
20471 to_underlying (die->sect_off));
20473 if (die->parent != NULL)
20475 print_spaces (indent, f);
20476 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
20477 to_underlying (die->parent->sect_off));
20480 print_spaces (indent, f);
20481 fprintf_unfiltered (f, " has children: %s\n",
20482 dwarf_bool_name (die->child != NULL));
20484 print_spaces (indent, f);
20485 fprintf_unfiltered (f, " attributes:\n");
20487 for (i = 0; i < die->num_attrs; ++i)
20489 print_spaces (indent, f);
20490 fprintf_unfiltered (f, " %s (%s) ",
20491 dwarf_attr_name (die->attrs[i].name),
20492 dwarf_form_name (die->attrs[i].form));
20494 switch (die->attrs[i].form)
20497 case DW_FORM_GNU_addr_index:
20498 fprintf_unfiltered (f, "address: ");
20499 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
20501 case DW_FORM_block2:
20502 case DW_FORM_block4:
20503 case DW_FORM_block:
20504 case DW_FORM_block1:
20505 fprintf_unfiltered (f, "block: size %s",
20506 pulongest (DW_BLOCK (&die->attrs[i])->size));
20508 case DW_FORM_exprloc:
20509 fprintf_unfiltered (f, "expression: size %s",
20510 pulongest (DW_BLOCK (&die->attrs[i])->size));
20512 case DW_FORM_data16:
20513 fprintf_unfiltered (f, "constant of 16 bytes");
20515 case DW_FORM_ref_addr:
20516 fprintf_unfiltered (f, "ref address: ");
20517 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
20519 case DW_FORM_GNU_ref_alt:
20520 fprintf_unfiltered (f, "alt ref address: ");
20521 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
20527 case DW_FORM_ref_udata:
20528 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
20529 (long) (DW_UNSND (&die->attrs[i])));
20531 case DW_FORM_data1:
20532 case DW_FORM_data2:
20533 case DW_FORM_data4:
20534 case DW_FORM_data8:
20535 case DW_FORM_udata:
20536 case DW_FORM_sdata:
20537 fprintf_unfiltered (f, "constant: %s",
20538 pulongest (DW_UNSND (&die->attrs[i])));
20540 case DW_FORM_sec_offset:
20541 fprintf_unfiltered (f, "section offset: %s",
20542 pulongest (DW_UNSND (&die->attrs[i])));
20544 case DW_FORM_ref_sig8:
20545 fprintf_unfiltered (f, "signature: %s",
20546 hex_string (DW_SIGNATURE (&die->attrs[i])));
20548 case DW_FORM_string:
20550 case DW_FORM_line_strp:
20551 case DW_FORM_GNU_str_index:
20552 case DW_FORM_GNU_strp_alt:
20553 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
20554 DW_STRING (&die->attrs[i])
20555 ? DW_STRING (&die->attrs[i]) : "",
20556 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
20559 if (DW_UNSND (&die->attrs[i]))
20560 fprintf_unfiltered (f, "flag: TRUE");
20562 fprintf_unfiltered (f, "flag: FALSE");
20564 case DW_FORM_flag_present:
20565 fprintf_unfiltered (f, "flag: TRUE");
20567 case DW_FORM_indirect:
20568 /* The reader will have reduced the indirect form to
20569 the "base form" so this form should not occur. */
20570 fprintf_unfiltered (f,
20571 "unexpected attribute form: DW_FORM_indirect");
20573 case DW_FORM_implicit_const:
20574 fprintf_unfiltered (f, "constant: %s",
20575 plongest (DW_SND (&die->attrs[i])));
20578 fprintf_unfiltered (f, "unsupported attribute form: %d.",
20579 die->attrs[i].form);
20582 fprintf_unfiltered (f, "\n");
20587 dump_die_for_error (struct die_info *die)
20589 dump_die_shallow (gdb_stderr, 0, die);
20593 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
20595 int indent = level * 4;
20597 gdb_assert (die != NULL);
20599 if (level >= max_level)
20602 dump_die_shallow (f, indent, die);
20604 if (die->child != NULL)
20606 print_spaces (indent, f);
20607 fprintf_unfiltered (f, " Children:");
20608 if (level + 1 < max_level)
20610 fprintf_unfiltered (f, "\n");
20611 dump_die_1 (f, level + 1, max_level, die->child);
20615 fprintf_unfiltered (f,
20616 " [not printed, max nesting level reached]\n");
20620 if (die->sibling != NULL && level > 0)
20622 dump_die_1 (f, level, max_level, die->sibling);
20626 /* This is called from the pdie macro in gdbinit.in.
20627 It's not static so gcc will keep a copy callable from gdb. */
20630 dump_die (struct die_info *die, int max_level)
20632 dump_die_1 (gdb_stdlog, 0, max_level, die);
20636 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
20640 slot = htab_find_slot_with_hash (cu->die_hash, die,
20641 to_underlying (die->sect_off),
20647 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
20651 dwarf2_get_ref_die_offset (const struct attribute *attr)
20653 if (attr_form_is_ref (attr))
20654 return (sect_offset) DW_UNSND (attr);
20656 complaint (&symfile_complaints,
20657 _("unsupported die ref attribute form: '%s'"),
20658 dwarf_form_name (attr->form));
20662 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
20663 * the value held by the attribute is not constant. */
20666 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
20668 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
20669 return DW_SND (attr);
20670 else if (attr->form == DW_FORM_udata
20671 || attr->form == DW_FORM_data1
20672 || attr->form == DW_FORM_data2
20673 || attr->form == DW_FORM_data4
20674 || attr->form == DW_FORM_data8)
20675 return DW_UNSND (attr);
20678 /* For DW_FORM_data16 see attr_form_is_constant. */
20679 complaint (&symfile_complaints,
20680 _("Attribute value is not a constant (%s)"),
20681 dwarf_form_name (attr->form));
20682 return default_value;
20686 /* Follow reference or signature attribute ATTR of SRC_DIE.
20687 On entry *REF_CU is the CU of SRC_DIE.
20688 On exit *REF_CU is the CU of the result. */
20690 static struct die_info *
20691 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
20692 struct dwarf2_cu **ref_cu)
20694 struct die_info *die;
20696 if (attr_form_is_ref (attr))
20697 die = follow_die_ref (src_die, attr, ref_cu);
20698 else if (attr->form == DW_FORM_ref_sig8)
20699 die = follow_die_sig (src_die, attr, ref_cu);
20702 dump_die_for_error (src_die);
20703 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
20704 objfile_name ((*ref_cu)->objfile));
20710 /* Follow reference OFFSET.
20711 On entry *REF_CU is the CU of the source die referencing OFFSET.
20712 On exit *REF_CU is the CU of the result.
20713 Returns NULL if OFFSET is invalid. */
20715 static struct die_info *
20716 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
20717 struct dwarf2_cu **ref_cu)
20719 struct die_info temp_die;
20720 struct dwarf2_cu *target_cu, *cu = *ref_cu;
20722 gdb_assert (cu->per_cu != NULL);
20726 if (cu->per_cu->is_debug_types)
20728 /* .debug_types CUs cannot reference anything outside their CU.
20729 If they need to, they have to reference a signatured type via
20730 DW_FORM_ref_sig8. */
20731 if (!offset_in_cu_p (&cu->header, sect_off))
20734 else if (offset_in_dwz != cu->per_cu->is_dwz
20735 || !offset_in_cu_p (&cu->header, sect_off))
20737 struct dwarf2_per_cu_data *per_cu;
20739 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
20742 /* If necessary, add it to the queue and load its DIEs. */
20743 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
20744 load_full_comp_unit (per_cu, cu->language);
20746 target_cu = per_cu->cu;
20748 else if (cu->dies == NULL)
20750 /* We're loading full DIEs during partial symbol reading. */
20751 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
20752 load_full_comp_unit (cu->per_cu, language_minimal);
20755 *ref_cu = target_cu;
20756 temp_die.sect_off = sect_off;
20757 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
20759 to_underlying (sect_off));
20762 /* Follow reference attribute ATTR of SRC_DIE.
20763 On entry *REF_CU is the CU of SRC_DIE.
20764 On exit *REF_CU is the CU of the result. */
20766 static struct die_info *
20767 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
20768 struct dwarf2_cu **ref_cu)
20770 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
20771 struct dwarf2_cu *cu = *ref_cu;
20772 struct die_info *die;
20774 die = follow_die_offset (sect_off,
20775 (attr->form == DW_FORM_GNU_ref_alt
20776 || cu->per_cu->is_dwz),
20779 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
20780 "at 0x%x [in module %s]"),
20781 to_underlying (sect_off), to_underlying (src_die->sect_off),
20782 objfile_name (cu->objfile));
20787 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
20788 Returned value is intended for DW_OP_call*. Returned
20789 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
20791 struct dwarf2_locexpr_baton
20792 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
20793 struct dwarf2_per_cu_data *per_cu,
20794 CORE_ADDR (*get_frame_pc) (void *baton),
20797 struct dwarf2_cu *cu;
20798 struct die_info *die;
20799 struct attribute *attr;
20800 struct dwarf2_locexpr_baton retval;
20802 dw2_setup (per_cu->objfile);
20804 if (per_cu->cu == NULL)
20809 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20810 Instead just throw an error, not much else we can do. */
20811 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20812 to_underlying (sect_off), objfile_name (per_cu->objfile));
20815 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20817 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20818 to_underlying (sect_off), objfile_name (per_cu->objfile));
20820 attr = dwarf2_attr (die, DW_AT_location, cu);
20823 /* DWARF: "If there is no such attribute, then there is no effect.".
20824 DATA is ignored if SIZE is 0. */
20826 retval.data = NULL;
20829 else if (attr_form_is_section_offset (attr))
20831 struct dwarf2_loclist_baton loclist_baton;
20832 CORE_ADDR pc = (*get_frame_pc) (baton);
20835 fill_in_loclist_baton (cu, &loclist_baton, attr);
20837 retval.data = dwarf2_find_location_expression (&loclist_baton,
20839 retval.size = size;
20843 if (!attr_form_is_block (attr))
20844 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
20845 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
20846 to_underlying (sect_off), objfile_name (per_cu->objfile));
20848 retval.data = DW_BLOCK (attr)->data;
20849 retval.size = DW_BLOCK (attr)->size;
20851 retval.per_cu = cu->per_cu;
20853 age_cached_comp_units ();
20858 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
20861 struct dwarf2_locexpr_baton
20862 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
20863 struct dwarf2_per_cu_data *per_cu,
20864 CORE_ADDR (*get_frame_pc) (void *baton),
20867 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
20869 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
20872 /* Write a constant of a given type as target-ordered bytes into
20875 static const gdb_byte *
20876 write_constant_as_bytes (struct obstack *obstack,
20877 enum bfd_endian byte_order,
20884 *len = TYPE_LENGTH (type);
20885 result = (gdb_byte *) obstack_alloc (obstack, *len);
20886 store_unsigned_integer (result, *len, byte_order, value);
20891 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
20892 pointer to the constant bytes and set LEN to the length of the
20893 data. If memory is needed, allocate it on OBSTACK. If the DIE
20894 does not have a DW_AT_const_value, return NULL. */
20897 dwarf2_fetch_constant_bytes (sect_offset sect_off,
20898 struct dwarf2_per_cu_data *per_cu,
20899 struct obstack *obstack,
20902 struct dwarf2_cu *cu;
20903 struct die_info *die;
20904 struct attribute *attr;
20905 const gdb_byte *result = NULL;
20908 enum bfd_endian byte_order;
20910 dw2_setup (per_cu->objfile);
20912 if (per_cu->cu == NULL)
20917 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20918 Instead just throw an error, not much else we can do. */
20919 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20920 to_underlying (sect_off), objfile_name (per_cu->objfile));
20923 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20925 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20926 to_underlying (sect_off), objfile_name (per_cu->objfile));
20929 attr = dwarf2_attr (die, DW_AT_const_value, cu);
20933 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
20934 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
20936 switch (attr->form)
20939 case DW_FORM_GNU_addr_index:
20943 *len = cu->header.addr_size;
20944 tem = (gdb_byte *) obstack_alloc (obstack, *len);
20945 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
20949 case DW_FORM_string:
20951 case DW_FORM_GNU_str_index:
20952 case DW_FORM_GNU_strp_alt:
20953 /* DW_STRING is already allocated on the objfile obstack, point
20955 result = (const gdb_byte *) DW_STRING (attr);
20956 *len = strlen (DW_STRING (attr));
20958 case DW_FORM_block1:
20959 case DW_FORM_block2:
20960 case DW_FORM_block4:
20961 case DW_FORM_block:
20962 case DW_FORM_exprloc:
20963 case DW_FORM_data16:
20964 result = DW_BLOCK (attr)->data;
20965 *len = DW_BLOCK (attr)->size;
20968 /* The DW_AT_const_value attributes are supposed to carry the
20969 symbol's value "represented as it would be on the target
20970 architecture." By the time we get here, it's already been
20971 converted to host endianness, so we just need to sign- or
20972 zero-extend it as appropriate. */
20973 case DW_FORM_data1:
20974 type = die_type (die, cu);
20975 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
20976 if (result == NULL)
20977 result = write_constant_as_bytes (obstack, byte_order,
20980 case DW_FORM_data2:
20981 type = die_type (die, cu);
20982 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
20983 if (result == NULL)
20984 result = write_constant_as_bytes (obstack, byte_order,
20987 case DW_FORM_data4:
20988 type = die_type (die, cu);
20989 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
20990 if (result == NULL)
20991 result = write_constant_as_bytes (obstack, byte_order,
20994 case DW_FORM_data8:
20995 type = die_type (die, cu);
20996 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
20997 if (result == NULL)
20998 result = write_constant_as_bytes (obstack, byte_order,
21002 case DW_FORM_sdata:
21003 case DW_FORM_implicit_const:
21004 type = die_type (die, cu);
21005 result = write_constant_as_bytes (obstack, byte_order,
21006 type, DW_SND (attr), len);
21009 case DW_FORM_udata:
21010 type = die_type (die, cu);
21011 result = write_constant_as_bytes (obstack, byte_order,
21012 type, DW_UNSND (attr), len);
21016 complaint (&symfile_complaints,
21017 _("unsupported const value attribute form: '%s'"),
21018 dwarf_form_name (attr->form));
21025 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
21026 valid type for this die is found. */
21029 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
21030 struct dwarf2_per_cu_data *per_cu)
21032 struct dwarf2_cu *cu;
21033 struct die_info *die;
21035 dw2_setup (per_cu->objfile);
21037 if (per_cu->cu == NULL)
21043 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
21047 return die_type (die, cu);
21050 /* Return the type of the DIE at DIE_OFFSET in the CU named by
21054 dwarf2_get_die_type (cu_offset die_offset,
21055 struct dwarf2_per_cu_data *per_cu)
21057 dw2_setup (per_cu->objfile);
21059 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
21060 return get_die_type_at_offset (die_offset_sect, per_cu);
21063 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
21064 On entry *REF_CU is the CU of SRC_DIE.
21065 On exit *REF_CU is the CU of the result.
21066 Returns NULL if the referenced DIE isn't found. */
21068 static struct die_info *
21069 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
21070 struct dwarf2_cu **ref_cu)
21072 struct die_info temp_die;
21073 struct dwarf2_cu *sig_cu;
21074 struct die_info *die;
21076 /* While it might be nice to assert sig_type->type == NULL here,
21077 we can get here for DW_AT_imported_declaration where we need
21078 the DIE not the type. */
21080 /* If necessary, add it to the queue and load its DIEs. */
21082 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
21083 read_signatured_type (sig_type);
21085 sig_cu = sig_type->per_cu.cu;
21086 gdb_assert (sig_cu != NULL);
21087 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
21088 temp_die.sect_off = sig_type->type_offset_in_section;
21089 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
21090 to_underlying (temp_die.sect_off));
21093 /* For .gdb_index version 7 keep track of included TUs.
21094 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
21095 if (dwarf2_per_objfile->index_table != NULL
21096 && dwarf2_per_objfile->index_table->version <= 7)
21098 VEC_safe_push (dwarf2_per_cu_ptr,
21099 (*ref_cu)->per_cu->imported_symtabs,
21110 /* Follow signatured type referenced by ATTR in SRC_DIE.
21111 On entry *REF_CU is the CU of SRC_DIE.
21112 On exit *REF_CU is the CU of the result.
21113 The result is the DIE of the type.
21114 If the referenced type cannot be found an error is thrown. */
21116 static struct die_info *
21117 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
21118 struct dwarf2_cu **ref_cu)
21120 ULONGEST signature = DW_SIGNATURE (attr);
21121 struct signatured_type *sig_type;
21122 struct die_info *die;
21124 gdb_assert (attr->form == DW_FORM_ref_sig8);
21126 sig_type = lookup_signatured_type (*ref_cu, signature);
21127 /* sig_type will be NULL if the signatured type is missing from
21129 if (sig_type == NULL)
21131 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
21132 " from DIE at 0x%x [in module %s]"),
21133 hex_string (signature), to_underlying (src_die->sect_off),
21134 objfile_name ((*ref_cu)->objfile));
21137 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
21140 dump_die_for_error (src_die);
21141 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
21142 " from DIE at 0x%x [in module %s]"),
21143 hex_string (signature), to_underlying (src_die->sect_off),
21144 objfile_name ((*ref_cu)->objfile));
21150 /* Get the type specified by SIGNATURE referenced in DIE/CU,
21151 reading in and processing the type unit if necessary. */
21153 static struct type *
21154 get_signatured_type (struct die_info *die, ULONGEST signature,
21155 struct dwarf2_cu *cu)
21157 struct signatured_type *sig_type;
21158 struct dwarf2_cu *type_cu;
21159 struct die_info *type_die;
21162 sig_type = lookup_signatured_type (cu, signature);
21163 /* sig_type will be NULL if the signatured type is missing from
21165 if (sig_type == NULL)
21167 complaint (&symfile_complaints,
21168 _("Dwarf Error: Cannot find signatured DIE %s referenced"
21169 " from DIE at 0x%x [in module %s]"),
21170 hex_string (signature), to_underlying (die->sect_off),
21171 objfile_name (dwarf2_per_objfile->objfile));
21172 return build_error_marker_type (cu, die);
21175 /* If we already know the type we're done. */
21176 if (sig_type->type != NULL)
21177 return sig_type->type;
21180 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
21181 if (type_die != NULL)
21183 /* N.B. We need to call get_die_type to ensure only one type for this DIE
21184 is created. This is important, for example, because for c++ classes
21185 we need TYPE_NAME set which is only done by new_symbol. Blech. */
21186 type = read_type_die (type_die, type_cu);
21189 complaint (&symfile_complaints,
21190 _("Dwarf Error: Cannot build signatured type %s"
21191 " referenced from DIE at 0x%x [in module %s]"),
21192 hex_string (signature), to_underlying (die->sect_off),
21193 objfile_name (dwarf2_per_objfile->objfile));
21194 type = build_error_marker_type (cu, die);
21199 complaint (&symfile_complaints,
21200 _("Dwarf Error: Problem reading signatured DIE %s referenced"
21201 " from DIE at 0x%x [in module %s]"),
21202 hex_string (signature), to_underlying (die->sect_off),
21203 objfile_name (dwarf2_per_objfile->objfile));
21204 type = build_error_marker_type (cu, die);
21206 sig_type->type = type;
21211 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
21212 reading in and processing the type unit if necessary. */
21214 static struct type *
21215 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
21216 struct dwarf2_cu *cu) /* ARI: editCase function */
21218 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
21219 if (attr_form_is_ref (attr))
21221 struct dwarf2_cu *type_cu = cu;
21222 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
21224 return read_type_die (type_die, type_cu);
21226 else if (attr->form == DW_FORM_ref_sig8)
21228 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
21232 complaint (&symfile_complaints,
21233 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
21234 " at 0x%x [in module %s]"),
21235 dwarf_form_name (attr->form), to_underlying (die->sect_off),
21236 objfile_name (dwarf2_per_objfile->objfile));
21237 return build_error_marker_type (cu, die);
21241 /* Load the DIEs associated with type unit PER_CU into memory. */
21244 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
21246 struct signatured_type *sig_type;
21248 /* Caller is responsible for ensuring type_unit_groups don't get here. */
21249 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
21251 /* We have the per_cu, but we need the signatured_type.
21252 Fortunately this is an easy translation. */
21253 gdb_assert (per_cu->is_debug_types);
21254 sig_type = (struct signatured_type *) per_cu;
21256 gdb_assert (per_cu->cu == NULL);
21258 read_signatured_type (sig_type);
21260 gdb_assert (per_cu->cu != NULL);
21263 /* die_reader_func for read_signatured_type.
21264 This is identical to load_full_comp_unit_reader,
21265 but is kept separate for now. */
21268 read_signatured_type_reader (const struct die_reader_specs *reader,
21269 const gdb_byte *info_ptr,
21270 struct die_info *comp_unit_die,
21274 struct dwarf2_cu *cu = reader->cu;
21276 gdb_assert (cu->die_hash == NULL);
21278 htab_create_alloc_ex (cu->header.length / 12,
21282 &cu->comp_unit_obstack,
21283 hashtab_obstack_allocate,
21284 dummy_obstack_deallocate);
21287 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
21288 &info_ptr, comp_unit_die);
21289 cu->dies = comp_unit_die;
21290 /* comp_unit_die is not stored in die_hash, no need. */
21292 /* We try not to read any attributes in this function, because not
21293 all CUs needed for references have been loaded yet, and symbol
21294 table processing isn't initialized. But we have to set the CU language,
21295 or we won't be able to build types correctly.
21296 Similarly, if we do not read the producer, we can not apply
21297 producer-specific interpretation. */
21298 prepare_one_comp_unit (cu, cu->dies, language_minimal);
21301 /* Read in a signatured type and build its CU and DIEs.
21302 If the type is a stub for the real type in a DWO file,
21303 read in the real type from the DWO file as well. */
21306 read_signatured_type (struct signatured_type *sig_type)
21308 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
21310 gdb_assert (per_cu->is_debug_types);
21311 gdb_assert (per_cu->cu == NULL);
21313 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
21314 read_signatured_type_reader, NULL);
21315 sig_type->per_cu.tu_read = 1;
21318 /* Decode simple location descriptions.
21319 Given a pointer to a dwarf block that defines a location, compute
21320 the location and return the value.
21322 NOTE drow/2003-11-18: This function is called in two situations
21323 now: for the address of static or global variables (partial symbols
21324 only) and for offsets into structures which are expected to be
21325 (more or less) constant. The partial symbol case should go away,
21326 and only the constant case should remain. That will let this
21327 function complain more accurately. A few special modes are allowed
21328 without complaint for global variables (for instance, global
21329 register values and thread-local values).
21331 A location description containing no operations indicates that the
21332 object is optimized out. The return value is 0 for that case.
21333 FIXME drow/2003-11-16: No callers check for this case any more; soon all
21334 callers will only want a very basic result and this can become a
21337 Note that stack[0] is unused except as a default error return. */
21340 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
21342 struct objfile *objfile = cu->objfile;
21344 size_t size = blk->size;
21345 const gdb_byte *data = blk->data;
21346 CORE_ADDR stack[64];
21348 unsigned int bytes_read, unsnd;
21354 stack[++stacki] = 0;
21393 stack[++stacki] = op - DW_OP_lit0;
21428 stack[++stacki] = op - DW_OP_reg0;
21430 dwarf2_complex_location_expr_complaint ();
21434 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
21436 stack[++stacki] = unsnd;
21438 dwarf2_complex_location_expr_complaint ();
21442 stack[++stacki] = read_address (objfile->obfd, &data[i],
21447 case DW_OP_const1u:
21448 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
21452 case DW_OP_const1s:
21453 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
21457 case DW_OP_const2u:
21458 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
21462 case DW_OP_const2s:
21463 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
21467 case DW_OP_const4u:
21468 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
21472 case DW_OP_const4s:
21473 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
21477 case DW_OP_const8u:
21478 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
21483 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
21489 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
21494 stack[stacki + 1] = stack[stacki];
21499 stack[stacki - 1] += stack[stacki];
21503 case DW_OP_plus_uconst:
21504 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
21510 stack[stacki - 1] -= stack[stacki];
21515 /* If we're not the last op, then we definitely can't encode
21516 this using GDB's address_class enum. This is valid for partial
21517 global symbols, although the variable's address will be bogus
21520 dwarf2_complex_location_expr_complaint ();
21523 case DW_OP_GNU_push_tls_address:
21524 case DW_OP_form_tls_address:
21525 /* The top of the stack has the offset from the beginning
21526 of the thread control block at which the variable is located. */
21527 /* Nothing should follow this operator, so the top of stack would
21529 /* This is valid for partial global symbols, but the variable's
21530 address will be bogus in the psymtab. Make it always at least
21531 non-zero to not look as a variable garbage collected by linker
21532 which have DW_OP_addr 0. */
21534 dwarf2_complex_location_expr_complaint ();
21538 case DW_OP_GNU_uninit:
21541 case DW_OP_GNU_addr_index:
21542 case DW_OP_GNU_const_index:
21543 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
21550 const char *name = get_DW_OP_name (op);
21553 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
21556 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
21560 return (stack[stacki]);
21563 /* Enforce maximum stack depth of SIZE-1 to avoid writing
21564 outside of the allocated space. Also enforce minimum>0. */
21565 if (stacki >= ARRAY_SIZE (stack) - 1)
21567 complaint (&symfile_complaints,
21568 _("location description stack overflow"));
21574 complaint (&symfile_complaints,
21575 _("location description stack underflow"));
21579 return (stack[stacki]);
21582 /* memory allocation interface */
21584 static struct dwarf_block *
21585 dwarf_alloc_block (struct dwarf2_cu *cu)
21587 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
21590 static struct die_info *
21591 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
21593 struct die_info *die;
21594 size_t size = sizeof (struct die_info);
21597 size += (num_attrs - 1) * sizeof (struct attribute);
21599 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
21600 memset (die, 0, sizeof (struct die_info));
21605 /* Macro support. */
21607 /* Return file name relative to the compilation directory of file number I in
21608 *LH's file name table. The result is allocated using xmalloc; the caller is
21609 responsible for freeing it. */
21612 file_file_name (int file, struct line_header *lh)
21614 /* Is the file number a valid index into the line header's file name
21615 table? Remember that file numbers start with one, not zero. */
21616 if (1 <= file && file <= lh->file_names.size ())
21618 const file_entry &fe = lh->file_names[file - 1];
21620 if (!IS_ABSOLUTE_PATH (fe.name))
21622 const char *dir = fe.include_dir (lh);
21624 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
21626 return xstrdup (fe.name);
21630 /* The compiler produced a bogus file number. We can at least
21631 record the macro definitions made in the file, even if we
21632 won't be able to find the file by name. */
21633 char fake_name[80];
21635 xsnprintf (fake_name, sizeof (fake_name),
21636 "<bad macro file number %d>", file);
21638 complaint (&symfile_complaints,
21639 _("bad file number in macro information (%d)"),
21642 return xstrdup (fake_name);
21646 /* Return the full name of file number I in *LH's file name table.
21647 Use COMP_DIR as the name of the current directory of the
21648 compilation. The result is allocated using xmalloc; the caller is
21649 responsible for freeing it. */
21651 file_full_name (int file, struct line_header *lh, const char *comp_dir)
21653 /* Is the file number a valid index into the line header's file name
21654 table? Remember that file numbers start with one, not zero. */
21655 if (1 <= file && file <= lh->file_names.size ())
21657 char *relative = file_file_name (file, lh);
21659 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
21661 return reconcat (relative, comp_dir, SLASH_STRING,
21662 relative, (char *) NULL);
21665 return file_file_name (file, lh);
21669 static struct macro_source_file *
21670 macro_start_file (int file, int line,
21671 struct macro_source_file *current_file,
21672 struct line_header *lh)
21674 /* File name relative to the compilation directory of this source file. */
21675 char *file_name = file_file_name (file, lh);
21677 if (! current_file)
21679 /* Note: We don't create a macro table for this compilation unit
21680 at all until we actually get a filename. */
21681 struct macro_table *macro_table = get_macro_table ();
21683 /* If we have no current file, then this must be the start_file
21684 directive for the compilation unit's main source file. */
21685 current_file = macro_set_main (macro_table, file_name);
21686 macro_define_special (macro_table);
21689 current_file = macro_include (current_file, line, file_name);
21693 return current_file;
21697 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
21698 followed by a null byte. */
21700 copy_string (const char *buf, int len)
21702 char *s = (char *) xmalloc (len + 1);
21704 memcpy (s, buf, len);
21710 static const char *
21711 consume_improper_spaces (const char *p, const char *body)
21715 complaint (&symfile_complaints,
21716 _("macro definition contains spaces "
21717 "in formal argument list:\n`%s'"),
21729 parse_macro_definition (struct macro_source_file *file, int line,
21734 /* The body string takes one of two forms. For object-like macro
21735 definitions, it should be:
21737 <macro name> " " <definition>
21739 For function-like macro definitions, it should be:
21741 <macro name> "() " <definition>
21743 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
21745 Spaces may appear only where explicitly indicated, and in the
21748 The Dwarf 2 spec says that an object-like macro's name is always
21749 followed by a space, but versions of GCC around March 2002 omit
21750 the space when the macro's definition is the empty string.
21752 The Dwarf 2 spec says that there should be no spaces between the
21753 formal arguments in a function-like macro's formal argument list,
21754 but versions of GCC around March 2002 include spaces after the
21758 /* Find the extent of the macro name. The macro name is terminated
21759 by either a space or null character (for an object-like macro) or
21760 an opening paren (for a function-like macro). */
21761 for (p = body; *p; p++)
21762 if (*p == ' ' || *p == '(')
21765 if (*p == ' ' || *p == '\0')
21767 /* It's an object-like macro. */
21768 int name_len = p - body;
21769 char *name = copy_string (body, name_len);
21770 const char *replacement;
21773 replacement = body + name_len + 1;
21776 dwarf2_macro_malformed_definition_complaint (body);
21777 replacement = body + name_len;
21780 macro_define_object (file, line, name, replacement);
21784 else if (*p == '(')
21786 /* It's a function-like macro. */
21787 char *name = copy_string (body, p - body);
21790 char **argv = XNEWVEC (char *, argv_size);
21794 p = consume_improper_spaces (p, body);
21796 /* Parse the formal argument list. */
21797 while (*p && *p != ')')
21799 /* Find the extent of the current argument name. */
21800 const char *arg_start = p;
21802 while (*p && *p != ',' && *p != ')' && *p != ' ')
21805 if (! *p || p == arg_start)
21806 dwarf2_macro_malformed_definition_complaint (body);
21809 /* Make sure argv has room for the new argument. */
21810 if (argc >= argv_size)
21813 argv = XRESIZEVEC (char *, argv, argv_size);
21816 argv[argc++] = copy_string (arg_start, p - arg_start);
21819 p = consume_improper_spaces (p, body);
21821 /* Consume the comma, if present. */
21826 p = consume_improper_spaces (p, body);
21835 /* Perfectly formed definition, no complaints. */
21836 macro_define_function (file, line, name,
21837 argc, (const char **) argv,
21839 else if (*p == '\0')
21841 /* Complain, but do define it. */
21842 dwarf2_macro_malformed_definition_complaint (body);
21843 macro_define_function (file, line, name,
21844 argc, (const char **) argv,
21848 /* Just complain. */
21849 dwarf2_macro_malformed_definition_complaint (body);
21852 /* Just complain. */
21853 dwarf2_macro_malformed_definition_complaint (body);
21859 for (i = 0; i < argc; i++)
21865 dwarf2_macro_malformed_definition_complaint (body);
21868 /* Skip some bytes from BYTES according to the form given in FORM.
21869 Returns the new pointer. */
21871 static const gdb_byte *
21872 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
21873 enum dwarf_form form,
21874 unsigned int offset_size,
21875 struct dwarf2_section_info *section)
21877 unsigned int bytes_read;
21881 case DW_FORM_data1:
21886 case DW_FORM_data2:
21890 case DW_FORM_data4:
21894 case DW_FORM_data8:
21898 case DW_FORM_data16:
21902 case DW_FORM_string:
21903 read_direct_string (abfd, bytes, &bytes_read);
21904 bytes += bytes_read;
21907 case DW_FORM_sec_offset:
21909 case DW_FORM_GNU_strp_alt:
21910 bytes += offset_size;
21913 case DW_FORM_block:
21914 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
21915 bytes += bytes_read;
21918 case DW_FORM_block1:
21919 bytes += 1 + read_1_byte (abfd, bytes);
21921 case DW_FORM_block2:
21922 bytes += 2 + read_2_bytes (abfd, bytes);
21924 case DW_FORM_block4:
21925 bytes += 4 + read_4_bytes (abfd, bytes);
21928 case DW_FORM_sdata:
21929 case DW_FORM_udata:
21930 case DW_FORM_GNU_addr_index:
21931 case DW_FORM_GNU_str_index:
21932 bytes = gdb_skip_leb128 (bytes, buffer_end);
21935 dwarf2_section_buffer_overflow_complaint (section);
21940 case DW_FORM_implicit_const:
21946 complaint (&symfile_complaints,
21947 _("invalid form 0x%x in `%s'"),
21948 form, get_section_name (section));
21956 /* A helper for dwarf_decode_macros that handles skipping an unknown
21957 opcode. Returns an updated pointer to the macro data buffer; or,
21958 on error, issues a complaint and returns NULL. */
21960 static const gdb_byte *
21961 skip_unknown_opcode (unsigned int opcode,
21962 const gdb_byte **opcode_definitions,
21963 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
21965 unsigned int offset_size,
21966 struct dwarf2_section_info *section)
21968 unsigned int bytes_read, i;
21970 const gdb_byte *defn;
21972 if (opcode_definitions[opcode] == NULL)
21974 complaint (&symfile_complaints,
21975 _("unrecognized DW_MACFINO opcode 0x%x"),
21980 defn = opcode_definitions[opcode];
21981 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
21982 defn += bytes_read;
21984 for (i = 0; i < arg; ++i)
21986 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
21987 (enum dwarf_form) defn[i], offset_size,
21989 if (mac_ptr == NULL)
21991 /* skip_form_bytes already issued the complaint. */
21999 /* A helper function which parses the header of a macro section.
22000 If the macro section is the extended (for now called "GNU") type,
22001 then this updates *OFFSET_SIZE. Returns a pointer to just after
22002 the header, or issues a complaint and returns NULL on error. */
22004 static const gdb_byte *
22005 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
22007 const gdb_byte *mac_ptr,
22008 unsigned int *offset_size,
22009 int section_is_gnu)
22011 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
22013 if (section_is_gnu)
22015 unsigned int version, flags;
22017 version = read_2_bytes (abfd, mac_ptr);
22018 if (version != 4 && version != 5)
22020 complaint (&symfile_complaints,
22021 _("unrecognized version `%d' in .debug_macro section"),
22027 flags = read_1_byte (abfd, mac_ptr);
22029 *offset_size = (flags & 1) ? 8 : 4;
22031 if ((flags & 2) != 0)
22032 /* We don't need the line table offset. */
22033 mac_ptr += *offset_size;
22035 /* Vendor opcode descriptions. */
22036 if ((flags & 4) != 0)
22038 unsigned int i, count;
22040 count = read_1_byte (abfd, mac_ptr);
22042 for (i = 0; i < count; ++i)
22044 unsigned int opcode, bytes_read;
22047 opcode = read_1_byte (abfd, mac_ptr);
22049 opcode_definitions[opcode] = mac_ptr;
22050 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22051 mac_ptr += bytes_read;
22060 /* A helper for dwarf_decode_macros that handles the GNU extensions,
22061 including DW_MACRO_import. */
22064 dwarf_decode_macro_bytes (bfd *abfd,
22065 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
22066 struct macro_source_file *current_file,
22067 struct line_header *lh,
22068 struct dwarf2_section_info *section,
22069 int section_is_gnu, int section_is_dwz,
22070 unsigned int offset_size,
22071 htab_t include_hash)
22073 struct objfile *objfile = dwarf2_per_objfile->objfile;
22074 enum dwarf_macro_record_type macinfo_type;
22075 int at_commandline;
22076 const gdb_byte *opcode_definitions[256];
22078 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
22079 &offset_size, section_is_gnu);
22080 if (mac_ptr == NULL)
22082 /* We already issued a complaint. */
22086 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
22087 GDB is still reading the definitions from command line. First
22088 DW_MACINFO_start_file will need to be ignored as it was already executed
22089 to create CURRENT_FILE for the main source holding also the command line
22090 definitions. On first met DW_MACINFO_start_file this flag is reset to
22091 normally execute all the remaining DW_MACINFO_start_file macinfos. */
22093 at_commandline = 1;
22097 /* Do we at least have room for a macinfo type byte? */
22098 if (mac_ptr >= mac_end)
22100 dwarf2_section_buffer_overflow_complaint (section);
22104 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
22107 /* Note that we rely on the fact that the corresponding GNU and
22108 DWARF constants are the same. */
22109 switch (macinfo_type)
22111 /* A zero macinfo type indicates the end of the macro
22116 case DW_MACRO_define:
22117 case DW_MACRO_undef:
22118 case DW_MACRO_define_strp:
22119 case DW_MACRO_undef_strp:
22120 case DW_MACRO_define_sup:
22121 case DW_MACRO_undef_sup:
22123 unsigned int bytes_read;
22128 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22129 mac_ptr += bytes_read;
22131 if (macinfo_type == DW_MACRO_define
22132 || macinfo_type == DW_MACRO_undef)
22134 body = read_direct_string (abfd, mac_ptr, &bytes_read);
22135 mac_ptr += bytes_read;
22139 LONGEST str_offset;
22141 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
22142 mac_ptr += offset_size;
22144 if (macinfo_type == DW_MACRO_define_sup
22145 || macinfo_type == DW_MACRO_undef_sup
22148 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22150 body = read_indirect_string_from_dwz (dwz, str_offset);
22153 body = read_indirect_string_at_offset (abfd, str_offset);
22156 is_define = (macinfo_type == DW_MACRO_define
22157 || macinfo_type == DW_MACRO_define_strp
22158 || macinfo_type == DW_MACRO_define_sup);
22159 if (! current_file)
22161 /* DWARF violation as no main source is present. */
22162 complaint (&symfile_complaints,
22163 _("debug info with no main source gives macro %s "
22165 is_define ? _("definition") : _("undefinition"),
22169 if ((line == 0 && !at_commandline)
22170 || (line != 0 && at_commandline))
22171 complaint (&symfile_complaints,
22172 _("debug info gives %s macro %s with %s line %d: %s"),
22173 at_commandline ? _("command-line") : _("in-file"),
22174 is_define ? _("definition") : _("undefinition"),
22175 line == 0 ? _("zero") : _("non-zero"), line, body);
22178 parse_macro_definition (current_file, line, body);
22181 gdb_assert (macinfo_type == DW_MACRO_undef
22182 || macinfo_type == DW_MACRO_undef_strp
22183 || macinfo_type == DW_MACRO_undef_sup);
22184 macro_undef (current_file, line, body);
22189 case DW_MACRO_start_file:
22191 unsigned int bytes_read;
22194 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22195 mac_ptr += bytes_read;
22196 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22197 mac_ptr += bytes_read;
22199 if ((line == 0 && !at_commandline)
22200 || (line != 0 && at_commandline))
22201 complaint (&symfile_complaints,
22202 _("debug info gives source %d included "
22203 "from %s at %s line %d"),
22204 file, at_commandline ? _("command-line") : _("file"),
22205 line == 0 ? _("zero") : _("non-zero"), line);
22207 if (at_commandline)
22209 /* This DW_MACRO_start_file was executed in the
22211 at_commandline = 0;
22214 current_file = macro_start_file (file, line, current_file, lh);
22218 case DW_MACRO_end_file:
22219 if (! current_file)
22220 complaint (&symfile_complaints,
22221 _("macro debug info has an unmatched "
22222 "`close_file' directive"));
22225 current_file = current_file->included_by;
22226 if (! current_file)
22228 enum dwarf_macro_record_type next_type;
22230 /* GCC circa March 2002 doesn't produce the zero
22231 type byte marking the end of the compilation
22232 unit. Complain if it's not there, but exit no
22235 /* Do we at least have room for a macinfo type byte? */
22236 if (mac_ptr >= mac_end)
22238 dwarf2_section_buffer_overflow_complaint (section);
22242 /* We don't increment mac_ptr here, so this is just
22245 = (enum dwarf_macro_record_type) read_1_byte (abfd,
22247 if (next_type != 0)
22248 complaint (&symfile_complaints,
22249 _("no terminating 0-type entry for "
22250 "macros in `.debug_macinfo' section"));
22257 case DW_MACRO_import:
22258 case DW_MACRO_import_sup:
22262 bfd *include_bfd = abfd;
22263 struct dwarf2_section_info *include_section = section;
22264 const gdb_byte *include_mac_end = mac_end;
22265 int is_dwz = section_is_dwz;
22266 const gdb_byte *new_mac_ptr;
22268 offset = read_offset_1 (abfd, mac_ptr, offset_size);
22269 mac_ptr += offset_size;
22271 if (macinfo_type == DW_MACRO_import_sup)
22273 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22275 dwarf2_read_section (objfile, &dwz->macro);
22277 include_section = &dwz->macro;
22278 include_bfd = get_section_bfd_owner (include_section);
22279 include_mac_end = dwz->macro.buffer + dwz->macro.size;
22283 new_mac_ptr = include_section->buffer + offset;
22284 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
22288 /* This has actually happened; see
22289 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
22290 complaint (&symfile_complaints,
22291 _("recursive DW_MACRO_import in "
22292 ".debug_macro section"));
22296 *slot = (void *) new_mac_ptr;
22298 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
22299 include_mac_end, current_file, lh,
22300 section, section_is_gnu, is_dwz,
22301 offset_size, include_hash);
22303 htab_remove_elt (include_hash, (void *) new_mac_ptr);
22308 case DW_MACINFO_vendor_ext:
22309 if (!section_is_gnu)
22311 unsigned int bytes_read;
22313 /* This reads the constant, but since we don't recognize
22314 any vendor extensions, we ignore it. */
22315 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22316 mac_ptr += bytes_read;
22317 read_direct_string (abfd, mac_ptr, &bytes_read);
22318 mac_ptr += bytes_read;
22320 /* We don't recognize any vendor extensions. */
22326 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
22327 mac_ptr, mac_end, abfd, offset_size,
22329 if (mac_ptr == NULL)
22333 } while (macinfo_type != 0);
22337 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
22338 int section_is_gnu)
22340 struct objfile *objfile = dwarf2_per_objfile->objfile;
22341 struct line_header *lh = cu->line_header;
22343 const gdb_byte *mac_ptr, *mac_end;
22344 struct macro_source_file *current_file = 0;
22345 enum dwarf_macro_record_type macinfo_type;
22346 unsigned int offset_size = cu->header.offset_size;
22347 const gdb_byte *opcode_definitions[256];
22348 struct cleanup *cleanup;
22350 struct dwarf2_section_info *section;
22351 const char *section_name;
22353 if (cu->dwo_unit != NULL)
22355 if (section_is_gnu)
22357 section = &cu->dwo_unit->dwo_file->sections.macro;
22358 section_name = ".debug_macro.dwo";
22362 section = &cu->dwo_unit->dwo_file->sections.macinfo;
22363 section_name = ".debug_macinfo.dwo";
22368 if (section_is_gnu)
22370 section = &dwarf2_per_objfile->macro;
22371 section_name = ".debug_macro";
22375 section = &dwarf2_per_objfile->macinfo;
22376 section_name = ".debug_macinfo";
22380 dwarf2_read_section (objfile, section);
22381 if (section->buffer == NULL)
22383 complaint (&symfile_complaints, _("missing %s section"), section_name);
22386 abfd = get_section_bfd_owner (section);
22388 /* First pass: Find the name of the base filename.
22389 This filename is needed in order to process all macros whose definition
22390 (or undefinition) comes from the command line. These macros are defined
22391 before the first DW_MACINFO_start_file entry, and yet still need to be
22392 associated to the base file.
22394 To determine the base file name, we scan the macro definitions until we
22395 reach the first DW_MACINFO_start_file entry. We then initialize
22396 CURRENT_FILE accordingly so that any macro definition found before the
22397 first DW_MACINFO_start_file can still be associated to the base file. */
22399 mac_ptr = section->buffer + offset;
22400 mac_end = section->buffer + section->size;
22402 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
22403 &offset_size, section_is_gnu);
22404 if (mac_ptr == NULL)
22406 /* We already issued a complaint. */
22412 /* Do we at least have room for a macinfo type byte? */
22413 if (mac_ptr >= mac_end)
22415 /* Complaint is printed during the second pass as GDB will probably
22416 stop the first pass earlier upon finding
22417 DW_MACINFO_start_file. */
22421 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
22424 /* Note that we rely on the fact that the corresponding GNU and
22425 DWARF constants are the same. */
22426 switch (macinfo_type)
22428 /* A zero macinfo type indicates the end of the macro
22433 case DW_MACRO_define:
22434 case DW_MACRO_undef:
22435 /* Only skip the data by MAC_PTR. */
22437 unsigned int bytes_read;
22439 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22440 mac_ptr += bytes_read;
22441 read_direct_string (abfd, mac_ptr, &bytes_read);
22442 mac_ptr += bytes_read;
22446 case DW_MACRO_start_file:
22448 unsigned int bytes_read;
22451 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22452 mac_ptr += bytes_read;
22453 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22454 mac_ptr += bytes_read;
22456 current_file = macro_start_file (file, line, current_file, lh);
22460 case DW_MACRO_end_file:
22461 /* No data to skip by MAC_PTR. */
22464 case DW_MACRO_define_strp:
22465 case DW_MACRO_undef_strp:
22466 case DW_MACRO_define_sup:
22467 case DW_MACRO_undef_sup:
22469 unsigned int bytes_read;
22471 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22472 mac_ptr += bytes_read;
22473 mac_ptr += offset_size;
22477 case DW_MACRO_import:
22478 case DW_MACRO_import_sup:
22479 /* Note that, according to the spec, a transparent include
22480 chain cannot call DW_MACRO_start_file. So, we can just
22481 skip this opcode. */
22482 mac_ptr += offset_size;
22485 case DW_MACINFO_vendor_ext:
22486 /* Only skip the data by MAC_PTR. */
22487 if (!section_is_gnu)
22489 unsigned int bytes_read;
22491 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22492 mac_ptr += bytes_read;
22493 read_direct_string (abfd, mac_ptr, &bytes_read);
22494 mac_ptr += bytes_read;
22499 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
22500 mac_ptr, mac_end, abfd, offset_size,
22502 if (mac_ptr == NULL)
22506 } while (macinfo_type != 0 && current_file == NULL);
22508 /* Second pass: Process all entries.
22510 Use the AT_COMMAND_LINE flag to determine whether we are still processing
22511 command-line macro definitions/undefinitions. This flag is unset when we
22512 reach the first DW_MACINFO_start_file entry. */
22514 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
22516 NULL, xcalloc, xfree));
22517 mac_ptr = section->buffer + offset;
22518 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
22519 *slot = (void *) mac_ptr;
22520 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
22521 current_file, lh, section,
22522 section_is_gnu, 0, offset_size,
22523 include_hash.get ());
22526 /* Check if the attribute's form is a DW_FORM_block*
22527 if so return true else false. */
22530 attr_form_is_block (const struct attribute *attr)
22532 return (attr == NULL ? 0 :
22533 attr->form == DW_FORM_block1
22534 || attr->form == DW_FORM_block2
22535 || attr->form == DW_FORM_block4
22536 || attr->form == DW_FORM_block
22537 || attr->form == DW_FORM_exprloc);
22540 /* Return non-zero if ATTR's value is a section offset --- classes
22541 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
22542 You may use DW_UNSND (attr) to retrieve such offsets.
22544 Section 7.5.4, "Attribute Encodings", explains that no attribute
22545 may have a value that belongs to more than one of these classes; it
22546 would be ambiguous if we did, because we use the same forms for all
22550 attr_form_is_section_offset (const struct attribute *attr)
22552 return (attr->form == DW_FORM_data4
22553 || attr->form == DW_FORM_data8
22554 || attr->form == DW_FORM_sec_offset);
22557 /* Return non-zero if ATTR's value falls in the 'constant' class, or
22558 zero otherwise. When this function returns true, you can apply
22559 dwarf2_get_attr_constant_value to it.
22561 However, note that for some attributes you must check
22562 attr_form_is_section_offset before using this test. DW_FORM_data4
22563 and DW_FORM_data8 are members of both the constant class, and of
22564 the classes that contain offsets into other debug sections
22565 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
22566 that, if an attribute's can be either a constant or one of the
22567 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
22568 taken as section offsets, not constants.
22570 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
22571 cannot handle that. */
22574 attr_form_is_constant (const struct attribute *attr)
22576 switch (attr->form)
22578 case DW_FORM_sdata:
22579 case DW_FORM_udata:
22580 case DW_FORM_data1:
22581 case DW_FORM_data2:
22582 case DW_FORM_data4:
22583 case DW_FORM_data8:
22584 case DW_FORM_implicit_const:
22592 /* DW_ADDR is always stored already as sect_offset; despite for the forms
22593 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
22596 attr_form_is_ref (const struct attribute *attr)
22598 switch (attr->form)
22600 case DW_FORM_ref_addr:
22605 case DW_FORM_ref_udata:
22606 case DW_FORM_GNU_ref_alt:
22613 /* Return the .debug_loc section to use for CU.
22614 For DWO files use .debug_loc.dwo. */
22616 static struct dwarf2_section_info *
22617 cu_debug_loc_section (struct dwarf2_cu *cu)
22621 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
22623 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
22625 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
22626 : &dwarf2_per_objfile->loc);
22629 /* A helper function that fills in a dwarf2_loclist_baton. */
22632 fill_in_loclist_baton (struct dwarf2_cu *cu,
22633 struct dwarf2_loclist_baton *baton,
22634 const struct attribute *attr)
22636 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
22638 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
22640 baton->per_cu = cu->per_cu;
22641 gdb_assert (baton->per_cu);
22642 /* We don't know how long the location list is, but make sure we
22643 don't run off the edge of the section. */
22644 baton->size = section->size - DW_UNSND (attr);
22645 baton->data = section->buffer + DW_UNSND (attr);
22646 baton->base_address = cu->base_address;
22647 baton->from_dwo = cu->dwo_unit != NULL;
22651 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
22652 struct dwarf2_cu *cu, int is_block)
22654 struct objfile *objfile = dwarf2_per_objfile->objfile;
22655 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
22657 if (attr_form_is_section_offset (attr)
22658 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
22659 the section. If so, fall through to the complaint in the
22661 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
22663 struct dwarf2_loclist_baton *baton;
22665 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
22667 fill_in_loclist_baton (cu, baton, attr);
22669 if (cu->base_known == 0)
22670 complaint (&symfile_complaints,
22671 _("Location list used without "
22672 "specifying the CU base address."));
22674 SYMBOL_ACLASS_INDEX (sym) = (is_block
22675 ? dwarf2_loclist_block_index
22676 : dwarf2_loclist_index);
22677 SYMBOL_LOCATION_BATON (sym) = baton;
22681 struct dwarf2_locexpr_baton *baton;
22683 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
22684 baton->per_cu = cu->per_cu;
22685 gdb_assert (baton->per_cu);
22687 if (attr_form_is_block (attr))
22689 /* Note that we're just copying the block's data pointer
22690 here, not the actual data. We're still pointing into the
22691 info_buffer for SYM's objfile; right now we never release
22692 that buffer, but when we do clean up properly this may
22694 baton->size = DW_BLOCK (attr)->size;
22695 baton->data = DW_BLOCK (attr)->data;
22699 dwarf2_invalid_attrib_class_complaint ("location description",
22700 SYMBOL_NATURAL_NAME (sym));
22704 SYMBOL_ACLASS_INDEX (sym) = (is_block
22705 ? dwarf2_locexpr_block_index
22706 : dwarf2_locexpr_index);
22707 SYMBOL_LOCATION_BATON (sym) = baton;
22711 /* Return the OBJFILE associated with the compilation unit CU. If CU
22712 came from a separate debuginfo file, then the master objfile is
22716 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
22718 struct objfile *objfile = per_cu->objfile;
22720 /* Return the master objfile, so that we can report and look up the
22721 correct file containing this variable. */
22722 if (objfile->separate_debug_objfile_backlink)
22723 objfile = objfile->separate_debug_objfile_backlink;
22728 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
22729 (CU_HEADERP is unused in such case) or prepare a temporary copy at
22730 CU_HEADERP first. */
22732 static const struct comp_unit_head *
22733 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
22734 struct dwarf2_per_cu_data *per_cu)
22736 const gdb_byte *info_ptr;
22739 return &per_cu->cu->header;
22741 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
22743 memset (cu_headerp, 0, sizeof (*cu_headerp));
22744 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
22745 rcuh_kind::COMPILE);
22750 /* Return the address size given in the compilation unit header for CU. */
22753 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
22755 struct comp_unit_head cu_header_local;
22756 const struct comp_unit_head *cu_headerp;
22758 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22760 return cu_headerp->addr_size;
22763 /* Return the offset size given in the compilation unit header for CU. */
22766 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
22768 struct comp_unit_head cu_header_local;
22769 const struct comp_unit_head *cu_headerp;
22771 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22773 return cu_headerp->offset_size;
22776 /* See its dwarf2loc.h declaration. */
22779 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
22781 struct comp_unit_head cu_header_local;
22782 const struct comp_unit_head *cu_headerp;
22784 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22786 if (cu_headerp->version == 2)
22787 return cu_headerp->addr_size;
22789 return cu_headerp->offset_size;
22792 /* Return the text offset of the CU. The returned offset comes from
22793 this CU's objfile. If this objfile came from a separate debuginfo
22794 file, then the offset may be different from the corresponding
22795 offset in the parent objfile. */
22798 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
22800 struct objfile *objfile = per_cu->objfile;
22802 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
22805 /* Return DWARF version number of PER_CU. */
22808 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
22810 return per_cu->dwarf_version;
22813 /* Locate the .debug_info compilation unit from CU's objfile which contains
22814 the DIE at OFFSET. Raises an error on failure. */
22816 static struct dwarf2_per_cu_data *
22817 dwarf2_find_containing_comp_unit (sect_offset sect_off,
22818 unsigned int offset_in_dwz,
22819 struct objfile *objfile)
22821 struct dwarf2_per_cu_data *this_cu;
22823 const sect_offset *cu_off;
22826 high = dwarf2_per_objfile->n_comp_units - 1;
22829 struct dwarf2_per_cu_data *mid_cu;
22830 int mid = low + (high - low) / 2;
22832 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
22833 cu_off = &mid_cu->sect_off;
22834 if (mid_cu->is_dwz > offset_in_dwz
22835 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
22840 gdb_assert (low == high);
22841 this_cu = dwarf2_per_objfile->all_comp_units[low];
22842 cu_off = &this_cu->sect_off;
22843 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
22845 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
22846 error (_("Dwarf Error: could not find partial DIE containing "
22847 "offset 0x%x [in module %s]"),
22848 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
22850 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
22852 return dwarf2_per_objfile->all_comp_units[low-1];
22856 this_cu = dwarf2_per_objfile->all_comp_units[low];
22857 if (low == dwarf2_per_objfile->n_comp_units - 1
22858 && sect_off >= this_cu->sect_off + this_cu->length)
22859 error (_("invalid dwarf2 offset %u"), to_underlying (sect_off));
22860 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
22865 /* Initialize dwarf2_cu CU, owned by PER_CU. */
22868 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
22870 memset (cu, 0, sizeof (*cu));
22872 cu->per_cu = per_cu;
22873 cu->objfile = per_cu->objfile;
22874 obstack_init (&cu->comp_unit_obstack);
22877 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
22880 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
22881 enum language pretend_language)
22883 struct attribute *attr;
22885 /* Set the language we're debugging. */
22886 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
22888 set_cu_language (DW_UNSND (attr), cu);
22891 cu->language = pretend_language;
22892 cu->language_defn = language_def (cu->language);
22895 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
22898 /* Release one cached compilation unit, CU. We unlink it from the tree
22899 of compilation units, but we don't remove it from the read_in_chain;
22900 the caller is responsible for that.
22901 NOTE: DATA is a void * because this function is also used as a
22902 cleanup routine. */
22905 free_heap_comp_unit (void *data)
22907 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22909 gdb_assert (cu->per_cu != NULL);
22910 cu->per_cu->cu = NULL;
22913 obstack_free (&cu->comp_unit_obstack, NULL);
22918 /* This cleanup function is passed the address of a dwarf2_cu on the stack
22919 when we're finished with it. We can't free the pointer itself, but be
22920 sure to unlink it from the cache. Also release any associated storage. */
22923 free_stack_comp_unit (void *data)
22925 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22927 gdb_assert (cu->per_cu != NULL);
22928 cu->per_cu->cu = NULL;
22931 obstack_free (&cu->comp_unit_obstack, NULL);
22932 cu->partial_dies = NULL;
22935 /* Free all cached compilation units. */
22938 free_cached_comp_units (void *data)
22940 dwarf2_per_objfile->free_cached_comp_units ();
22943 /* Increase the age counter on each cached compilation unit, and free
22944 any that are too old. */
22947 age_cached_comp_units (void)
22949 struct dwarf2_per_cu_data *per_cu, **last_chain;
22951 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
22952 per_cu = dwarf2_per_objfile->read_in_chain;
22953 while (per_cu != NULL)
22955 per_cu->cu->last_used ++;
22956 if (per_cu->cu->last_used <= dwarf_max_cache_age)
22957 dwarf2_mark (per_cu->cu);
22958 per_cu = per_cu->cu->read_in_chain;
22961 per_cu = dwarf2_per_objfile->read_in_chain;
22962 last_chain = &dwarf2_per_objfile->read_in_chain;
22963 while (per_cu != NULL)
22965 struct dwarf2_per_cu_data *next_cu;
22967 next_cu = per_cu->cu->read_in_chain;
22969 if (!per_cu->cu->mark)
22971 free_heap_comp_unit (per_cu->cu);
22972 *last_chain = next_cu;
22975 last_chain = &per_cu->cu->read_in_chain;
22981 /* Remove a single compilation unit from the cache. */
22984 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
22986 struct dwarf2_per_cu_data *per_cu, **last_chain;
22988 per_cu = dwarf2_per_objfile->read_in_chain;
22989 last_chain = &dwarf2_per_objfile->read_in_chain;
22990 while (per_cu != NULL)
22992 struct dwarf2_per_cu_data *next_cu;
22994 next_cu = per_cu->cu->read_in_chain;
22996 if (per_cu == target_per_cu)
22998 free_heap_comp_unit (per_cu->cu);
23000 *last_chain = next_cu;
23004 last_chain = &per_cu->cu->read_in_chain;
23010 /* Release all extra memory associated with OBJFILE. */
23013 dwarf2_free_objfile (struct objfile *objfile)
23016 = (struct dwarf2_per_objfile *) objfile_data (objfile,
23017 dwarf2_objfile_data_key);
23019 if (dwarf2_per_objfile == NULL)
23022 dwarf2_per_objfile->~dwarf2_per_objfile ();
23025 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
23026 We store these in a hash table separate from the DIEs, and preserve them
23027 when the DIEs are flushed out of cache.
23029 The CU "per_cu" pointer is needed because offset alone is not enough to
23030 uniquely identify the type. A file may have multiple .debug_types sections,
23031 or the type may come from a DWO file. Furthermore, while it's more logical
23032 to use per_cu->section+offset, with Fission the section with the data is in
23033 the DWO file but we don't know that section at the point we need it.
23034 We have to use something in dwarf2_per_cu_data (or the pointer to it)
23035 because we can enter the lookup routine, get_die_type_at_offset, from
23036 outside this file, and thus won't necessarily have PER_CU->cu.
23037 Fortunately, PER_CU is stable for the life of the objfile. */
23039 struct dwarf2_per_cu_offset_and_type
23041 const struct dwarf2_per_cu_data *per_cu;
23042 sect_offset sect_off;
23046 /* Hash function for a dwarf2_per_cu_offset_and_type. */
23049 per_cu_offset_and_type_hash (const void *item)
23051 const struct dwarf2_per_cu_offset_and_type *ofs
23052 = (const struct dwarf2_per_cu_offset_and_type *) item;
23054 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
23057 /* Equality function for a dwarf2_per_cu_offset_and_type. */
23060 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
23062 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
23063 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
23064 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
23065 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
23067 return (ofs_lhs->per_cu == ofs_rhs->per_cu
23068 && ofs_lhs->sect_off == ofs_rhs->sect_off);
23071 /* Set the type associated with DIE to TYPE. Save it in CU's hash
23072 table if necessary. For convenience, return TYPE.
23074 The DIEs reading must have careful ordering to:
23075 * Not cause infite loops trying to read in DIEs as a prerequisite for
23076 reading current DIE.
23077 * Not trying to dereference contents of still incompletely read in types
23078 while reading in other DIEs.
23079 * Enable referencing still incompletely read in types just by a pointer to
23080 the type without accessing its fields.
23082 Therefore caller should follow these rules:
23083 * Try to fetch any prerequisite types we may need to build this DIE type
23084 before building the type and calling set_die_type.
23085 * After building type call set_die_type for current DIE as soon as
23086 possible before fetching more types to complete the current type.
23087 * Make the type as complete as possible before fetching more types. */
23089 static struct type *
23090 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
23092 struct dwarf2_per_cu_offset_and_type **slot, ofs;
23093 struct objfile *objfile = cu->objfile;
23094 struct attribute *attr;
23095 struct dynamic_prop prop;
23097 /* For Ada types, make sure that the gnat-specific data is always
23098 initialized (if not already set). There are a few types where
23099 we should not be doing so, because the type-specific area is
23100 already used to hold some other piece of info (eg: TYPE_CODE_FLT
23101 where the type-specific area is used to store the floatformat).
23102 But this is not a problem, because the gnat-specific information
23103 is actually not needed for these types. */
23104 if (need_gnat_info (cu)
23105 && TYPE_CODE (type) != TYPE_CODE_FUNC
23106 && TYPE_CODE (type) != TYPE_CODE_FLT
23107 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
23108 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
23109 && TYPE_CODE (type) != TYPE_CODE_METHOD
23110 && !HAVE_GNAT_AUX_INFO (type))
23111 INIT_GNAT_SPECIFIC (type);
23113 /* Read DW_AT_allocated and set in type. */
23114 attr = dwarf2_attr (die, DW_AT_allocated, cu);
23115 if (attr_form_is_block (attr))
23117 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23118 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type, objfile);
23120 else if (attr != NULL)
23122 complaint (&symfile_complaints,
23123 _("DW_AT_allocated has the wrong form (%s) at DIE 0x%x"),
23124 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23125 to_underlying (die->sect_off));
23128 /* Read DW_AT_associated and set in type. */
23129 attr = dwarf2_attr (die, DW_AT_associated, cu);
23130 if (attr_form_is_block (attr))
23132 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23133 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type, objfile);
23135 else if (attr != NULL)
23137 complaint (&symfile_complaints,
23138 _("DW_AT_associated has the wrong form (%s) at DIE 0x%x"),
23139 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23140 to_underlying (die->sect_off));
23143 /* Read DW_AT_data_location and set in type. */
23144 attr = dwarf2_attr (die, DW_AT_data_location, cu);
23145 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23146 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type, objfile);
23148 if (dwarf2_per_objfile->die_type_hash == NULL)
23150 dwarf2_per_objfile->die_type_hash =
23151 htab_create_alloc_ex (127,
23152 per_cu_offset_and_type_hash,
23153 per_cu_offset_and_type_eq,
23155 &objfile->objfile_obstack,
23156 hashtab_obstack_allocate,
23157 dummy_obstack_deallocate);
23160 ofs.per_cu = cu->per_cu;
23161 ofs.sect_off = die->sect_off;
23163 slot = (struct dwarf2_per_cu_offset_and_type **)
23164 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
23166 complaint (&symfile_complaints,
23167 _("A problem internal to GDB: DIE 0x%x has type already set"),
23168 to_underlying (die->sect_off));
23169 *slot = XOBNEW (&objfile->objfile_obstack,
23170 struct dwarf2_per_cu_offset_and_type);
23175 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
23176 or return NULL if the die does not have a saved type. */
23178 static struct type *
23179 get_die_type_at_offset (sect_offset sect_off,
23180 struct dwarf2_per_cu_data *per_cu)
23182 struct dwarf2_per_cu_offset_and_type *slot, ofs;
23184 if (dwarf2_per_objfile->die_type_hash == NULL)
23187 ofs.per_cu = per_cu;
23188 ofs.sect_off = sect_off;
23189 slot = ((struct dwarf2_per_cu_offset_and_type *)
23190 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
23197 /* Look up the type for DIE in CU in die_type_hash,
23198 or return NULL if DIE does not have a saved type. */
23200 static struct type *
23201 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
23203 return get_die_type_at_offset (die->sect_off, cu->per_cu);
23206 /* Add a dependence relationship from CU to REF_PER_CU. */
23209 dwarf2_add_dependence (struct dwarf2_cu *cu,
23210 struct dwarf2_per_cu_data *ref_per_cu)
23214 if (cu->dependencies == NULL)
23216 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
23217 NULL, &cu->comp_unit_obstack,
23218 hashtab_obstack_allocate,
23219 dummy_obstack_deallocate);
23221 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
23223 *slot = ref_per_cu;
23226 /* Subroutine of dwarf2_mark to pass to htab_traverse.
23227 Set the mark field in every compilation unit in the
23228 cache that we must keep because we are keeping CU. */
23231 dwarf2_mark_helper (void **slot, void *data)
23233 struct dwarf2_per_cu_data *per_cu;
23235 per_cu = (struct dwarf2_per_cu_data *) *slot;
23237 /* cu->dependencies references may not yet have been ever read if QUIT aborts
23238 reading of the chain. As such dependencies remain valid it is not much
23239 useful to track and undo them during QUIT cleanups. */
23240 if (per_cu->cu == NULL)
23243 if (per_cu->cu->mark)
23245 per_cu->cu->mark = 1;
23247 if (per_cu->cu->dependencies != NULL)
23248 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
23253 /* Set the mark field in CU and in every other compilation unit in the
23254 cache that we must keep because we are keeping CU. */
23257 dwarf2_mark (struct dwarf2_cu *cu)
23262 if (cu->dependencies != NULL)
23263 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
23267 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
23271 per_cu->cu->mark = 0;
23272 per_cu = per_cu->cu->read_in_chain;
23276 /* Trivial hash function for partial_die_info: the hash value of a DIE
23277 is its offset in .debug_info for this objfile. */
23280 partial_die_hash (const void *item)
23282 const struct partial_die_info *part_die
23283 = (const struct partial_die_info *) item;
23285 return to_underlying (part_die->sect_off);
23288 /* Trivial comparison function for partial_die_info structures: two DIEs
23289 are equal if they have the same offset. */
23292 partial_die_eq (const void *item_lhs, const void *item_rhs)
23294 const struct partial_die_info *part_die_lhs
23295 = (const struct partial_die_info *) item_lhs;
23296 const struct partial_die_info *part_die_rhs
23297 = (const struct partial_die_info *) item_rhs;
23299 return part_die_lhs->sect_off == part_die_rhs->sect_off;
23302 static struct cmd_list_element *set_dwarf_cmdlist;
23303 static struct cmd_list_element *show_dwarf_cmdlist;
23306 set_dwarf_cmd (char *args, int from_tty)
23308 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
23313 show_dwarf_cmd (char *args, int from_tty)
23315 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
23318 /* Free data associated with OBJFILE, if necessary. */
23321 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
23323 struct dwarf2_per_objfile *data = (struct dwarf2_per_objfile *) d;
23326 /* Make sure we don't accidentally use dwarf2_per_objfile while
23328 dwarf2_per_objfile = NULL;
23330 for (ix = 0; ix < data->n_comp_units; ++ix)
23331 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
23333 for (ix = 0; ix < data->n_type_units; ++ix)
23334 VEC_free (dwarf2_per_cu_ptr,
23335 data->all_type_units[ix]->per_cu.imported_symtabs);
23336 xfree (data->all_type_units);
23338 VEC_free (dwarf2_section_info_def, data->types);
23340 if (data->dwo_files)
23341 free_dwo_files (data->dwo_files, objfile);
23342 if (data->dwp_file)
23343 gdb_bfd_unref (data->dwp_file->dbfd);
23345 if (data->dwz_file && data->dwz_file->dwz_bfd)
23346 gdb_bfd_unref (data->dwz_file->dwz_bfd);
23350 /* The "save gdb-index" command. */
23352 /* In-memory buffer to prepare data to be written later to a file. */
23356 /* Copy DATA to the end of the buffer. */
23357 template<typename T>
23358 void append_data (const T &data)
23360 std::copy (reinterpret_cast<const gdb_byte *> (&data),
23361 reinterpret_cast<const gdb_byte *> (&data + 1),
23362 grow (sizeof (data)));
23365 /* Copy CSTR (a zero-terminated string) to the end of buffer. The
23366 terminating zero is appended too. */
23367 void append_cstr0 (const char *cstr)
23369 const size_t size = strlen (cstr) + 1;
23370 std::copy (cstr, cstr + size, grow (size));
23373 /* Accept a host-format integer in VAL and append it to the buffer
23374 as a target-format integer which is LEN bytes long. */
23375 void append_uint (size_t len, bfd_endian byte_order, ULONGEST val)
23377 ::store_unsigned_integer (grow (len), len, byte_order, val);
23380 /* Return the size of the buffer. */
23381 size_t size () const
23383 return m_vec.size ();
23386 /* Write the buffer to FILE. */
23387 void file_write (FILE *file) const
23389 if (::fwrite (m_vec.data (), 1, m_vec.size (), file) != m_vec.size ())
23390 error (_("couldn't write data to file"));
23394 /* Grow SIZE bytes at the end of the buffer. Returns a pointer to
23395 the start of the new block. */
23396 gdb_byte *grow (size_t size)
23398 m_vec.resize (m_vec.size () + size);
23399 return &*m_vec.end () - size;
23402 gdb::byte_vector m_vec;
23405 /* An entry in the symbol table. */
23406 struct symtab_index_entry
23408 /* The name of the symbol. */
23410 /* The offset of the name in the constant pool. */
23411 offset_type index_offset;
23412 /* A sorted vector of the indices of all the CUs that hold an object
23414 std::vector<offset_type> cu_indices;
23417 /* The symbol table. This is a power-of-2-sized hash table. */
23418 struct mapped_symtab
23422 data.resize (1024);
23425 offset_type n_elements = 0;
23426 std::vector<symtab_index_entry> data;
23429 /* Find a slot in SYMTAB for the symbol NAME. Returns a reference to
23432 Function is used only during write_hash_table so no index format backward
23433 compatibility is needed. */
23435 static symtab_index_entry &
23436 find_slot (struct mapped_symtab *symtab, const char *name)
23438 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
23440 index = hash & (symtab->data.size () - 1);
23441 step = ((hash * 17) & (symtab->data.size () - 1)) | 1;
23445 if (symtab->data[index].name == NULL
23446 || strcmp (name, symtab->data[index].name) == 0)
23447 return symtab->data[index];
23448 index = (index + step) & (symtab->data.size () - 1);
23452 /* Expand SYMTAB's hash table. */
23455 hash_expand (struct mapped_symtab *symtab)
23457 auto old_entries = std::move (symtab->data);
23459 symtab->data.clear ();
23460 symtab->data.resize (old_entries.size () * 2);
23462 for (auto &it : old_entries)
23463 if (it.name != NULL)
23465 auto &ref = find_slot (symtab, it.name);
23466 ref = std::move (it);
23470 /* Add an entry to SYMTAB. NAME is the name of the symbol.
23471 CU_INDEX is the index of the CU in which the symbol appears.
23472 IS_STATIC is one if the symbol is static, otherwise zero (global). */
23475 add_index_entry (struct mapped_symtab *symtab, const char *name,
23476 int is_static, gdb_index_symbol_kind kind,
23477 offset_type cu_index)
23479 offset_type cu_index_and_attrs;
23481 ++symtab->n_elements;
23482 if (4 * symtab->n_elements / 3 >= symtab->data.size ())
23483 hash_expand (symtab);
23485 symtab_index_entry &slot = find_slot (symtab, name);
23486 if (slot.name == NULL)
23489 /* index_offset is set later. */
23492 cu_index_and_attrs = 0;
23493 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
23494 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
23495 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
23497 /* We don't want to record an index value twice as we want to avoid the
23499 We process all global symbols and then all static symbols
23500 (which would allow us to avoid the duplication by only having to check
23501 the last entry pushed), but a symbol could have multiple kinds in one CU.
23502 To keep things simple we don't worry about the duplication here and
23503 sort and uniqufy the list after we've processed all symbols. */
23504 slot.cu_indices.push_back (cu_index_and_attrs);
23507 /* Sort and remove duplicates of all symbols' cu_indices lists. */
23510 uniquify_cu_indices (struct mapped_symtab *symtab)
23512 for (auto &entry : symtab->data)
23514 if (entry.name != NULL && !entry.cu_indices.empty ())
23516 auto &cu_indices = entry.cu_indices;
23517 std::sort (cu_indices.begin (), cu_indices.end ());
23518 auto from = std::unique (cu_indices.begin (), cu_indices.end ());
23519 cu_indices.erase (from, cu_indices.end ());
23524 /* A form of 'const char *' suitable for container keys. Only the
23525 pointer is stored. The strings themselves are compared, not the
23530 c_str_view (const char *cstr)
23534 bool operator== (const c_str_view &other) const
23536 return strcmp (m_cstr, other.m_cstr) == 0;
23540 friend class c_str_view_hasher;
23541 const char *const m_cstr;
23544 /* A std::unordered_map::hasher for c_str_view that uses the right
23545 hash function for strings in a mapped index. */
23546 class c_str_view_hasher
23549 size_t operator () (const c_str_view &x) const
23551 return mapped_index_string_hash (INT_MAX, x.m_cstr);
23555 /* A std::unordered_map::hasher for std::vector<>. */
23556 template<typename T>
23557 class vector_hasher
23560 size_t operator () (const std::vector<T> &key) const
23562 return iterative_hash (key.data (),
23563 sizeof (key.front ()) * key.size (), 0);
23567 /* Write the mapped hash table SYMTAB to the data buffer OUTPUT, with
23568 constant pool entries going into the data buffer CPOOL. */
23571 write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
23574 /* Elements are sorted vectors of the indices of all the CUs that
23575 hold an object of this name. */
23576 std::unordered_map<std::vector<offset_type>, offset_type,
23577 vector_hasher<offset_type>>
23580 /* We add all the index vectors to the constant pool first, to
23581 ensure alignment is ok. */
23582 for (symtab_index_entry &entry : symtab->data)
23584 if (entry.name == NULL)
23586 gdb_assert (entry.index_offset == 0);
23588 /* Finding before inserting is faster than always trying to
23589 insert, because inserting always allocates a node, does the
23590 lookup, and then destroys the new node if another node
23591 already had the same key. C++17 try_emplace will avoid
23594 = symbol_hash_table.find (entry.cu_indices);
23595 if (found != symbol_hash_table.end ())
23597 entry.index_offset = found->second;
23601 symbol_hash_table.emplace (entry.cu_indices, cpool.size ());
23602 entry.index_offset = cpool.size ();
23603 cpool.append_data (MAYBE_SWAP (entry.cu_indices.size ()));
23604 for (const auto index : entry.cu_indices)
23605 cpool.append_data (MAYBE_SWAP (index));
23609 /* Now write out the hash table. */
23610 std::unordered_map<c_str_view, offset_type, c_str_view_hasher> str_table;
23611 for (const auto &entry : symtab->data)
23613 offset_type str_off, vec_off;
23615 if (entry.name != NULL)
23617 const auto insertpair = str_table.emplace (entry.name, cpool.size ());
23618 if (insertpair.second)
23619 cpool.append_cstr0 (entry.name);
23620 str_off = insertpair.first->second;
23621 vec_off = entry.index_offset;
23625 /* While 0 is a valid constant pool index, it is not valid
23626 to have 0 for both offsets. */
23631 output.append_data (MAYBE_SWAP (str_off));
23632 output.append_data (MAYBE_SWAP (vec_off));
23636 typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
23638 /* Helper struct for building the address table. */
23639 struct addrmap_index_data
23641 addrmap_index_data (data_buf &addr_vec_, psym_index_map &cu_index_htab_)
23642 : addr_vec (addr_vec_), cu_index_htab (cu_index_htab_)
23645 struct objfile *objfile;
23646 data_buf &addr_vec;
23647 psym_index_map &cu_index_htab;
23649 /* Non-zero if the previous_* fields are valid.
23650 We can't write an entry until we see the next entry (since it is only then
23651 that we know the end of the entry). */
23652 int previous_valid;
23653 /* Index of the CU in the table of all CUs in the index file. */
23654 unsigned int previous_cu_index;
23655 /* Start address of the CU. */
23656 CORE_ADDR previous_cu_start;
23659 /* Write an address entry to ADDR_VEC. */
23662 add_address_entry (struct objfile *objfile, data_buf &addr_vec,
23663 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
23665 CORE_ADDR baseaddr;
23667 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
23669 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, start - baseaddr);
23670 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, end - baseaddr);
23671 addr_vec.append_data (MAYBE_SWAP (cu_index));
23674 /* Worker function for traversing an addrmap to build the address table. */
23677 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
23679 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
23680 struct partial_symtab *pst = (struct partial_symtab *) obj;
23682 if (data->previous_valid)
23683 add_address_entry (data->objfile, data->addr_vec,
23684 data->previous_cu_start, start_addr,
23685 data->previous_cu_index);
23687 data->previous_cu_start = start_addr;
23690 const auto it = data->cu_index_htab.find (pst);
23691 gdb_assert (it != data->cu_index_htab.cend ());
23692 data->previous_cu_index = it->second;
23693 data->previous_valid = 1;
23696 data->previous_valid = 0;
23701 /* Write OBJFILE's address map to ADDR_VEC.
23702 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
23703 in the index file. */
23706 write_address_map (struct objfile *objfile, data_buf &addr_vec,
23707 psym_index_map &cu_index_htab)
23709 struct addrmap_index_data addrmap_index_data (addr_vec, cu_index_htab);
23711 /* When writing the address table, we have to cope with the fact that
23712 the addrmap iterator only provides the start of a region; we have to
23713 wait until the next invocation to get the start of the next region. */
23715 addrmap_index_data.objfile = objfile;
23716 addrmap_index_data.previous_valid = 0;
23718 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
23719 &addrmap_index_data);
23721 /* It's highly unlikely the last entry (end address = 0xff...ff)
23722 is valid, but we should still handle it.
23723 The end address is recorded as the start of the next region, but that
23724 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
23726 if (addrmap_index_data.previous_valid)
23727 add_address_entry (objfile, addr_vec,
23728 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
23729 addrmap_index_data.previous_cu_index);
23732 /* Return the symbol kind of PSYM. */
23734 static gdb_index_symbol_kind
23735 symbol_kind (struct partial_symbol *psym)
23737 domain_enum domain = PSYMBOL_DOMAIN (psym);
23738 enum address_class aclass = PSYMBOL_CLASS (psym);
23746 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
23748 return GDB_INDEX_SYMBOL_KIND_TYPE;
23750 case LOC_CONST_BYTES:
23751 case LOC_OPTIMIZED_OUT:
23753 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23755 /* Note: It's currently impossible to recognize psyms as enum values
23756 short of reading the type info. For now punt. */
23757 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23759 /* There are other LOC_FOO values that one might want to classify
23760 as variables, but dwarf2read.c doesn't currently use them. */
23761 return GDB_INDEX_SYMBOL_KIND_OTHER;
23763 case STRUCT_DOMAIN:
23764 return GDB_INDEX_SYMBOL_KIND_TYPE;
23766 return GDB_INDEX_SYMBOL_KIND_OTHER;
23770 /* Add a list of partial symbols to SYMTAB. */
23773 write_psymbols (struct mapped_symtab *symtab,
23774 std::unordered_set<partial_symbol *> &psyms_seen,
23775 struct partial_symbol **psymp,
23777 offset_type cu_index,
23780 for (; count-- > 0; ++psymp)
23782 struct partial_symbol *psym = *psymp;
23784 if (SYMBOL_LANGUAGE (psym) == language_ada)
23785 error (_("Ada is not currently supported by the index"));
23787 /* Only add a given psymbol once. */
23788 if (psyms_seen.insert (psym).second)
23790 gdb_index_symbol_kind kind = symbol_kind (psym);
23792 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
23793 is_static, kind, cu_index);
23798 /* A helper struct used when iterating over debug_types. */
23799 struct signatured_type_index_data
23801 signatured_type_index_data (data_buf &types_list_,
23802 std::unordered_set<partial_symbol *> &psyms_seen_)
23803 : types_list (types_list_), psyms_seen (psyms_seen_)
23806 struct objfile *objfile;
23807 struct mapped_symtab *symtab;
23808 data_buf &types_list;
23809 std::unordered_set<partial_symbol *> &psyms_seen;
23813 /* A helper function that writes a single signatured_type to an
23817 write_one_signatured_type (void **slot, void *d)
23819 struct signatured_type_index_data *info
23820 = (struct signatured_type_index_data *) d;
23821 struct signatured_type *entry = (struct signatured_type *) *slot;
23822 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
23824 write_psymbols (info->symtab,
23826 info->objfile->global_psymbols.list
23827 + psymtab->globals_offset,
23828 psymtab->n_global_syms, info->cu_index,
23830 write_psymbols (info->symtab,
23832 info->objfile->static_psymbols.list
23833 + psymtab->statics_offset,
23834 psymtab->n_static_syms, info->cu_index,
23837 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
23838 to_underlying (entry->per_cu.sect_off));
23839 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
23840 to_underlying (entry->type_offset_in_tu));
23841 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE, entry->signature);
23848 /* Recurse into all "included" dependencies and count their symbols as
23849 if they appeared in this psymtab. */
23852 recursively_count_psymbols (struct partial_symtab *psymtab,
23853 size_t &psyms_seen)
23855 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
23856 if (psymtab->dependencies[i]->user != NULL)
23857 recursively_count_psymbols (psymtab->dependencies[i],
23860 psyms_seen += psymtab->n_global_syms;
23861 psyms_seen += psymtab->n_static_syms;
23864 /* Recurse into all "included" dependencies and write their symbols as
23865 if they appeared in this psymtab. */
23868 recursively_write_psymbols (struct objfile *objfile,
23869 struct partial_symtab *psymtab,
23870 struct mapped_symtab *symtab,
23871 std::unordered_set<partial_symbol *> &psyms_seen,
23872 offset_type cu_index)
23876 for (i = 0; i < psymtab->number_of_dependencies; ++i)
23877 if (psymtab->dependencies[i]->user != NULL)
23878 recursively_write_psymbols (objfile, psymtab->dependencies[i],
23879 symtab, psyms_seen, cu_index);
23881 write_psymbols (symtab,
23883 objfile->global_psymbols.list + psymtab->globals_offset,
23884 psymtab->n_global_syms, cu_index,
23886 write_psymbols (symtab,
23888 objfile->static_psymbols.list + psymtab->statics_offset,
23889 psymtab->n_static_syms, cu_index,
23893 /* Create an index file for OBJFILE in the directory DIR. */
23896 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
23898 if (dwarf2_per_objfile->using_index)
23899 error (_("Cannot use an index to create the index"));
23901 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
23902 error (_("Cannot make an index when the file has multiple .debug_types sections"));
23904 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
23908 if (stat (objfile_name (objfile), &st) < 0)
23909 perror_with_name (objfile_name (objfile));
23911 std::string filename (std::string (dir) + SLASH_STRING
23912 + lbasename (objfile_name (objfile)) + INDEX_SUFFIX);
23914 FILE *out_file = gdb_fopen_cloexec (filename.c_str (), "wb").release ();
23916 error (_("Can't open `%s' for writing"), filename.c_str ());
23918 /* Order matters here; we want FILE to be closed before FILENAME is
23919 unlinked, because on MS-Windows one cannot delete a file that is
23920 still open. (Don't call anything here that might throw until
23921 file_closer is created.) */
23922 gdb::unlinker unlink_file (filename.c_str ());
23923 gdb_file_up close_out_file (out_file);
23925 mapped_symtab symtab;
23928 /* While we're scanning CU's create a table that maps a psymtab pointer
23929 (which is what addrmap records) to its index (which is what is recorded
23930 in the index file). This will later be needed to write the address
23932 psym_index_map cu_index_htab;
23933 cu_index_htab.reserve (dwarf2_per_objfile->n_comp_units);
23935 /* The CU list is already sorted, so we don't need to do additional
23936 work here. Also, the debug_types entries do not appear in
23937 all_comp_units, but only in their own hash table. */
23939 /* The psyms_seen set is potentially going to be largish (~40k
23940 elements when indexing a -g3 build of GDB itself). Estimate the
23941 number of elements in order to avoid too many rehashes, which
23942 require rebuilding buckets and thus many trips to
23944 size_t psyms_count = 0;
23945 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
23947 struct dwarf2_per_cu_data *per_cu
23948 = dwarf2_per_objfile->all_comp_units[i];
23949 struct partial_symtab *psymtab = per_cu->v.psymtab;
23951 if (psymtab != NULL && psymtab->user == NULL)
23952 recursively_count_psymbols (psymtab, psyms_count);
23954 /* Generating an index for gdb itself shows a ratio of
23955 TOTAL_SEEN_SYMS/UNIQUE_SYMS or ~5. 4 seems like a good bet. */
23956 std::unordered_set<partial_symbol *> psyms_seen (psyms_count / 4);
23957 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
23959 struct dwarf2_per_cu_data *per_cu
23960 = dwarf2_per_objfile->all_comp_units[i];
23961 struct partial_symtab *psymtab = per_cu->v.psymtab;
23963 /* CU of a shared file from 'dwz -m' may be unused by this main file.
23964 It may be referenced from a local scope but in such case it does not
23965 need to be present in .gdb_index. */
23966 if (psymtab == NULL)
23969 if (psymtab->user == NULL)
23970 recursively_write_psymbols (objfile, psymtab, &symtab,
23973 const auto insertpair = cu_index_htab.emplace (psymtab, i);
23974 gdb_assert (insertpair.second);
23976 cu_list.append_uint (8, BFD_ENDIAN_LITTLE,
23977 to_underlying (per_cu->sect_off));
23978 cu_list.append_uint (8, BFD_ENDIAN_LITTLE, per_cu->length);
23981 /* Dump the address map. */
23983 write_address_map (objfile, addr_vec, cu_index_htab);
23985 /* Write out the .debug_type entries, if any. */
23986 data_buf types_cu_list;
23987 if (dwarf2_per_objfile->signatured_types)
23989 signatured_type_index_data sig_data (types_cu_list,
23992 sig_data.objfile = objfile;
23993 sig_data.symtab = &symtab;
23994 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
23995 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
23996 write_one_signatured_type, &sig_data);
23999 /* Now that we've processed all symbols we can shrink their cu_indices
24001 uniquify_cu_indices (&symtab);
24003 data_buf symtab_vec, constant_pool;
24004 write_hash_table (&symtab, symtab_vec, constant_pool);
24007 const offset_type size_of_contents = 6 * sizeof (offset_type);
24008 offset_type total_len = size_of_contents;
24010 /* The version number. */
24011 contents.append_data (MAYBE_SWAP (8));
24013 /* The offset of the CU list from the start of the file. */
24014 contents.append_data (MAYBE_SWAP (total_len));
24015 total_len += cu_list.size ();
24017 /* The offset of the types CU list from the start of the file. */
24018 contents.append_data (MAYBE_SWAP (total_len));
24019 total_len += types_cu_list.size ();
24021 /* The offset of the address table from the start of the file. */
24022 contents.append_data (MAYBE_SWAP (total_len));
24023 total_len += addr_vec.size ();
24025 /* The offset of the symbol table from the start of the file. */
24026 contents.append_data (MAYBE_SWAP (total_len));
24027 total_len += symtab_vec.size ();
24029 /* The offset of the constant pool from the start of the file. */
24030 contents.append_data (MAYBE_SWAP (total_len));
24031 total_len += constant_pool.size ();
24033 gdb_assert (contents.size () == size_of_contents);
24035 contents.file_write (out_file);
24036 cu_list.file_write (out_file);
24037 types_cu_list.file_write (out_file);
24038 addr_vec.file_write (out_file);
24039 symtab_vec.file_write (out_file);
24040 constant_pool.file_write (out_file);
24042 /* We want to keep the file. */
24043 unlink_file.keep ();
24046 /* Implementation of the `save gdb-index' command.
24048 Note that the file format used by this command is documented in the
24049 GDB manual. Any changes here must be documented there. */
24052 save_gdb_index_command (char *arg, int from_tty)
24054 struct objfile *objfile;
24057 error (_("usage: save gdb-index DIRECTORY"));
24059 ALL_OBJFILES (objfile)
24063 /* If the objfile does not correspond to an actual file, skip it. */
24064 if (stat (objfile_name (objfile), &st) < 0)
24068 = (struct dwarf2_per_objfile *) objfile_data (objfile,
24069 dwarf2_objfile_data_key);
24070 if (dwarf2_per_objfile)
24075 write_psymtabs_to_index (objfile, arg);
24077 CATCH (except, RETURN_MASK_ERROR)
24079 exception_fprintf (gdb_stderr, except,
24080 _("Error while writing index for `%s': "),
24081 objfile_name (objfile));
24090 int dwarf_always_disassemble;
24093 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
24094 struct cmd_list_element *c, const char *value)
24096 fprintf_filtered (file,
24097 _("Whether to always disassemble "
24098 "DWARF expressions is %s.\n"),
24103 show_check_physname (struct ui_file *file, int from_tty,
24104 struct cmd_list_element *c, const char *value)
24106 fprintf_filtered (file,
24107 _("Whether to check \"physname\" is %s.\n"),
24111 void _initialize_dwarf2_read (void);
24114 _initialize_dwarf2_read (void)
24116 struct cmd_list_element *c;
24118 dwarf2_objfile_data_key
24119 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
24121 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
24122 Set DWARF specific variables.\n\
24123 Configure DWARF variables such as the cache size"),
24124 &set_dwarf_cmdlist, "maintenance set dwarf ",
24125 0/*allow-unknown*/, &maintenance_set_cmdlist);
24127 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
24128 Show DWARF specific variables\n\
24129 Show DWARF variables such as the cache size"),
24130 &show_dwarf_cmdlist, "maintenance show dwarf ",
24131 0/*allow-unknown*/, &maintenance_show_cmdlist);
24133 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
24134 &dwarf_max_cache_age, _("\
24135 Set the upper bound on the age of cached DWARF compilation units."), _("\
24136 Show the upper bound on the age of cached DWARF compilation units."), _("\
24137 A higher limit means that cached compilation units will be stored\n\
24138 in memory longer, and more total memory will be used. Zero disables\n\
24139 caching, which can slow down startup."),
24141 show_dwarf_max_cache_age,
24142 &set_dwarf_cmdlist,
24143 &show_dwarf_cmdlist);
24145 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
24146 &dwarf_always_disassemble, _("\
24147 Set whether `info address' always disassembles DWARF expressions."), _("\
24148 Show whether `info address' always disassembles DWARF expressions."), _("\
24149 When enabled, DWARF expressions are always printed in an assembly-like\n\
24150 syntax. When disabled, expressions will be printed in a more\n\
24151 conversational style, when possible."),
24153 show_dwarf_always_disassemble,
24154 &set_dwarf_cmdlist,
24155 &show_dwarf_cmdlist);
24157 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
24158 Set debugging of the DWARF reader."), _("\
24159 Show debugging of the DWARF reader."), _("\
24160 When enabled (non-zero), debugging messages are printed during DWARF\n\
24161 reading and symtab expansion. A value of 1 (one) provides basic\n\
24162 information. A value greater than 1 provides more verbose information."),
24165 &setdebuglist, &showdebuglist);
24167 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
24168 Set debugging of the DWARF DIE reader."), _("\
24169 Show debugging of the DWARF DIE reader."), _("\
24170 When enabled (non-zero), DIEs are dumped after they are read in.\n\
24171 The value is the maximum depth to print."),
24174 &setdebuglist, &showdebuglist);
24176 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
24177 Set debugging of the dwarf line reader."), _("\
24178 Show debugging of the dwarf line reader."), _("\
24179 When enabled (non-zero), line number entries are dumped as they are read in.\n\
24180 A value of 1 (one) provides basic information.\n\
24181 A value greater than 1 provides more verbose information."),
24184 &setdebuglist, &showdebuglist);
24186 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
24187 Set cross-checking of \"physname\" code against demangler."), _("\
24188 Show cross-checking of \"physname\" code against demangler."), _("\
24189 When enabled, GDB's internal \"physname\" code is checked against\n\
24191 NULL, show_check_physname,
24192 &setdebuglist, &showdebuglist);
24194 add_setshow_boolean_cmd ("use-deprecated-index-sections",
24195 no_class, &use_deprecated_index_sections, _("\
24196 Set whether to use deprecated gdb_index sections."), _("\
24197 Show whether to use deprecated gdb_index sections."), _("\
24198 When enabled, deprecated .gdb_index sections are used anyway.\n\
24199 Normally they are ignored either because of a missing feature or\n\
24200 performance issue.\n\
24201 Warning: This option must be enabled before gdb reads the file."),
24204 &setlist, &showlist);
24206 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
24208 Save a gdb-index file.\n\
24209 Usage: save gdb-index DIRECTORY"),
24211 set_cmd_completer (c, filename_completer);
24213 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
24214 &dwarf2_locexpr_funcs);
24215 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
24216 &dwarf2_loclist_funcs);
24218 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
24219 &dwarf2_block_frame_base_locexpr_funcs);
24220 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
24221 &dwarf2_block_frame_base_loclist_funcs);