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 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
8736 compute the physname for the object, which include a method's:
8737 - formal parameters (C++),
8738 - receiver type (Go),
8740 The term "physname" is a bit confusing.
8741 For C++, for example, it is the demangled name.
8742 For Go, for example, it's the mangled name.
8744 For Ada, return the DIE's linkage name rather than the fully qualified
8745 name. PHYSNAME is ignored..
8747 The result is allocated on the objfile_obstack and canonicalized. */
8750 dwarf2_compute_name (const char *name,
8751 struct die_info *die, struct dwarf2_cu *cu,
8754 struct objfile *objfile = cu->objfile;
8757 name = dwarf2_name (die, cu);
8759 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
8760 but otherwise compute it by typename_concat inside GDB.
8761 FIXME: Actually this is not really true, or at least not always true.
8762 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
8763 Fortran names because there is no mangling standard. So new_symbol_full
8764 will set the demangled name to the result of dwarf2_full_name, and it is
8765 the demangled name that GDB uses if it exists. */
8766 if (cu->language == language_ada
8767 || (cu->language == language_fortran && physname))
8769 /* For Ada unit, we prefer the linkage name over the name, as
8770 the former contains the exported name, which the user expects
8771 to be able to reference. Ideally, we want the user to be able
8772 to reference this entity using either natural or linkage name,
8773 but we haven't started looking at this enhancement yet. */
8774 const char *linkage_name;
8776 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
8777 if (linkage_name == NULL)
8778 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
8779 if (linkage_name != NULL)
8780 return linkage_name;
8783 /* These are the only languages we know how to qualify names in. */
8785 && (cu->language == language_cplus
8786 || cu->language == language_fortran || cu->language == language_d
8787 || cu->language == language_rust))
8789 if (die_needs_namespace (die, cu))
8793 const char *canonical_name = NULL;
8797 prefix = determine_prefix (die, cu);
8798 if (*prefix != '\0')
8800 char *prefixed_name = typename_concat (NULL, prefix, name,
8803 buf.puts (prefixed_name);
8804 xfree (prefixed_name);
8809 /* Template parameters may be specified in the DIE's DW_AT_name, or
8810 as children with DW_TAG_template_type_param or
8811 DW_TAG_value_type_param. If the latter, add them to the name
8812 here. If the name already has template parameters, then
8813 skip this step; some versions of GCC emit both, and
8814 it is more efficient to use the pre-computed name.
8816 Something to keep in mind about this process: it is very
8817 unlikely, or in some cases downright impossible, to produce
8818 something that will match the mangled name of a function.
8819 If the definition of the function has the same debug info,
8820 we should be able to match up with it anyway. But fallbacks
8821 using the minimal symbol, for instance to find a method
8822 implemented in a stripped copy of libstdc++, will not work.
8823 If we do not have debug info for the definition, we will have to
8824 match them up some other way.
8826 When we do name matching there is a related problem with function
8827 templates; two instantiated function templates are allowed to
8828 differ only by their return types, which we do not add here. */
8830 if (cu->language == language_cplus && strchr (name, '<') == NULL)
8832 struct attribute *attr;
8833 struct die_info *child;
8836 die->building_fullname = 1;
8838 for (child = die->child; child != NULL; child = child->sibling)
8842 const gdb_byte *bytes;
8843 struct dwarf2_locexpr_baton *baton;
8846 if (child->tag != DW_TAG_template_type_param
8847 && child->tag != DW_TAG_template_value_param)
8858 attr = dwarf2_attr (child, DW_AT_type, cu);
8861 complaint (&symfile_complaints,
8862 _("template parameter missing DW_AT_type"));
8863 buf.puts ("UNKNOWN_TYPE");
8866 type = die_type (child, cu);
8868 if (child->tag == DW_TAG_template_type_param)
8870 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
8874 attr = dwarf2_attr (child, DW_AT_const_value, cu);
8877 complaint (&symfile_complaints,
8878 _("template parameter missing "
8879 "DW_AT_const_value"));
8880 buf.puts ("UNKNOWN_VALUE");
8884 dwarf2_const_value_attr (attr, type, name,
8885 &cu->comp_unit_obstack, cu,
8886 &value, &bytes, &baton);
8888 if (TYPE_NOSIGN (type))
8889 /* GDB prints characters as NUMBER 'CHAR'. If that's
8890 changed, this can use value_print instead. */
8891 c_printchar (value, type, &buf);
8894 struct value_print_options opts;
8897 v = dwarf2_evaluate_loc_desc (type, NULL,
8901 else if (bytes != NULL)
8903 v = allocate_value (type);
8904 memcpy (value_contents_writeable (v), bytes,
8905 TYPE_LENGTH (type));
8908 v = value_from_longest (type, value);
8910 /* Specify decimal so that we do not depend on
8912 get_formatted_print_options (&opts, 'd');
8914 value_print (v, &buf, &opts);
8920 die->building_fullname = 0;
8924 /* Close the argument list, with a space if necessary
8925 (nested templates). */
8926 if (!buf.empty () && buf.string ().back () == '>')
8933 /* For C++ methods, append formal parameter type
8934 information, if PHYSNAME. */
8936 if (physname && die->tag == DW_TAG_subprogram
8937 && cu->language == language_cplus)
8939 struct type *type = read_type_die (die, cu);
8941 c_type_print_args (type, &buf, 1, cu->language,
8942 &type_print_raw_options);
8944 if (cu->language == language_cplus)
8946 /* Assume that an artificial first parameter is
8947 "this", but do not crash if it is not. RealView
8948 marks unnamed (and thus unused) parameters as
8949 artificial; there is no way to differentiate
8951 if (TYPE_NFIELDS (type) > 0
8952 && TYPE_FIELD_ARTIFICIAL (type, 0)
8953 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8954 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8956 buf.puts (" const");
8960 const std::string &intermediate_name = buf.string ();
8962 if (cu->language == language_cplus)
8964 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
8965 &objfile->per_bfd->storage_obstack);
8967 /* If we only computed INTERMEDIATE_NAME, or if
8968 INTERMEDIATE_NAME is already canonical, then we need to
8969 copy it to the appropriate obstack. */
8970 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
8971 name = ((const char *)
8972 obstack_copy0 (&objfile->per_bfd->storage_obstack,
8973 intermediate_name.c_str (),
8974 intermediate_name.length ()));
8976 name = canonical_name;
8983 /* Return the fully qualified name of DIE, based on its DW_AT_name.
8984 If scope qualifiers are appropriate they will be added. The result
8985 will be allocated on the storage_obstack, or NULL if the DIE does
8986 not have a name. NAME may either be from a previous call to
8987 dwarf2_name or NULL.
8989 The output string will be canonicalized (if C++). */
8992 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8994 return dwarf2_compute_name (name, die, cu, 0);
8997 /* Construct a physname for the given DIE in CU. NAME may either be
8998 from a previous call to dwarf2_name or NULL. The result will be
8999 allocated on the objfile_objstack or NULL if the DIE does not have a
9002 The output string will be canonicalized (if C++). */
9005 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
9007 struct objfile *objfile = cu->objfile;
9008 const char *retval, *mangled = NULL, *canon = NULL;
9009 struct cleanup *back_to;
9012 /* In this case dwarf2_compute_name is just a shortcut not building anything
9014 if (!die_needs_namespace (die, cu))
9015 return dwarf2_compute_name (name, die, cu, 1);
9017 back_to = make_cleanup (null_cleanup, NULL);
9019 mangled = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
9020 if (mangled == NULL)
9021 mangled = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
9023 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
9024 See https://github.com/rust-lang/rust/issues/32925. */
9025 if (cu->language == language_rust && mangled != NULL
9026 && strchr (mangled, '{') != NULL)
9029 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
9031 if (mangled != NULL)
9035 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
9036 type. It is easier for GDB users to search for such functions as
9037 `name(params)' than `long name(params)'. In such case the minimal
9038 symbol names do not match the full symbol names but for template
9039 functions there is never a need to look up their definition from their
9040 declaration so the only disadvantage remains the minimal symbol
9041 variant `long name(params)' does not have the proper inferior type.
9044 if (cu->language == language_go)
9046 /* This is a lie, but we already lie to the caller new_symbol_full.
9047 new_symbol_full assumes we return the mangled name.
9048 This just undoes that lie until things are cleaned up. */
9053 demangled = gdb_demangle (mangled,
9054 (DMGL_PARAMS | DMGL_ANSI | DMGL_RET_DROP));
9058 make_cleanup (xfree, demangled);
9068 if (canon == NULL || check_physname)
9070 const char *physname = dwarf2_compute_name (name, die, cu, 1);
9072 if (canon != NULL && strcmp (physname, canon) != 0)
9074 /* It may not mean a bug in GDB. The compiler could also
9075 compute DW_AT_linkage_name incorrectly. But in such case
9076 GDB would need to be bug-to-bug compatible. */
9078 complaint (&symfile_complaints,
9079 _("Computed physname <%s> does not match demangled <%s> "
9080 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
9081 physname, canon, mangled, to_underlying (die->sect_off),
9082 objfile_name (objfile));
9084 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
9085 is available here - over computed PHYSNAME. It is safer
9086 against both buggy GDB and buggy compilers. */
9100 retval = ((const char *)
9101 obstack_copy0 (&objfile->per_bfd->storage_obstack,
9102 retval, strlen (retval)));
9104 do_cleanups (back_to);
9108 /* Inspect DIE in CU for a namespace alias. If one exists, record
9109 a new symbol for it.
9111 Returns 1 if a namespace alias was recorded, 0 otherwise. */
9114 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
9116 struct attribute *attr;
9118 /* If the die does not have a name, this is not a namespace
9120 attr = dwarf2_attr (die, DW_AT_name, cu);
9124 struct die_info *d = die;
9125 struct dwarf2_cu *imported_cu = cu;
9127 /* If the compiler has nested DW_AT_imported_declaration DIEs,
9128 keep inspecting DIEs until we hit the underlying import. */
9129 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
9130 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
9132 attr = dwarf2_attr (d, DW_AT_import, cu);
9136 d = follow_die_ref (d, attr, &imported_cu);
9137 if (d->tag != DW_TAG_imported_declaration)
9141 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
9143 complaint (&symfile_complaints,
9144 _("DIE at 0x%x has too many recursively imported "
9145 "declarations"), to_underlying (d->sect_off));
9152 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
9154 type = get_die_type_at_offset (sect_off, cu->per_cu);
9155 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
9157 /* This declaration is a global namespace alias. Add
9158 a symbol for it whose type is the aliased namespace. */
9159 new_symbol (die, type, cu);
9168 /* Return the using directives repository (global or local?) to use in the
9169 current context for LANGUAGE.
9171 For Ada, imported declarations can materialize renamings, which *may* be
9172 global. However it is impossible (for now?) in DWARF to distinguish
9173 "external" imported declarations and "static" ones. As all imported
9174 declarations seem to be static in all other languages, make them all CU-wide
9175 global only in Ada. */
9177 static struct using_direct **
9178 using_directives (enum language language)
9180 if (language == language_ada && context_stack_depth == 0)
9181 return &global_using_directives;
9183 return &local_using_directives;
9186 /* Read the import statement specified by the given die and record it. */
9189 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
9191 struct objfile *objfile = cu->objfile;
9192 struct attribute *import_attr;
9193 struct die_info *imported_die, *child_die;
9194 struct dwarf2_cu *imported_cu;
9195 const char *imported_name;
9196 const char *imported_name_prefix;
9197 const char *canonical_name;
9198 const char *import_alias;
9199 const char *imported_declaration = NULL;
9200 const char *import_prefix;
9201 VEC (const_char_ptr) *excludes = NULL;
9202 struct cleanup *cleanups;
9204 import_attr = dwarf2_attr (die, DW_AT_import, cu);
9205 if (import_attr == NULL)
9207 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9208 dwarf_tag_name (die->tag));
9213 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
9214 imported_name = dwarf2_name (imported_die, imported_cu);
9215 if (imported_name == NULL)
9217 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
9219 The import in the following code:
9233 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
9234 <52> DW_AT_decl_file : 1
9235 <53> DW_AT_decl_line : 6
9236 <54> DW_AT_import : <0x75>
9237 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
9239 <5b> DW_AT_decl_file : 1
9240 <5c> DW_AT_decl_line : 2
9241 <5d> DW_AT_type : <0x6e>
9243 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
9244 <76> DW_AT_byte_size : 4
9245 <77> DW_AT_encoding : 5 (signed)
9247 imports the wrong die ( 0x75 instead of 0x58 ).
9248 This case will be ignored until the gcc bug is fixed. */
9252 /* Figure out the local name after import. */
9253 import_alias = dwarf2_name (die, cu);
9255 /* Figure out where the statement is being imported to. */
9256 import_prefix = determine_prefix (die, cu);
9258 /* Figure out what the scope of the imported die is and prepend it
9259 to the name of the imported die. */
9260 imported_name_prefix = determine_prefix (imported_die, imported_cu);
9262 if (imported_die->tag != DW_TAG_namespace
9263 && imported_die->tag != DW_TAG_module)
9265 imported_declaration = imported_name;
9266 canonical_name = imported_name_prefix;
9268 else if (strlen (imported_name_prefix) > 0)
9269 canonical_name = obconcat (&objfile->objfile_obstack,
9270 imported_name_prefix,
9271 (cu->language == language_d ? "." : "::"),
9272 imported_name, (char *) NULL);
9274 canonical_name = imported_name;
9276 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
9278 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
9279 for (child_die = die->child; child_die && child_die->tag;
9280 child_die = sibling_die (child_die))
9282 /* DWARF-4: A Fortran use statement with a “rename list” may be
9283 represented by an imported module entry with an import attribute
9284 referring to the module and owned entries corresponding to those
9285 entities that are renamed as part of being imported. */
9287 if (child_die->tag != DW_TAG_imported_declaration)
9289 complaint (&symfile_complaints,
9290 _("child DW_TAG_imported_declaration expected "
9291 "- DIE at 0x%x [in module %s]"),
9292 to_underlying (child_die->sect_off), objfile_name (objfile));
9296 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
9297 if (import_attr == NULL)
9299 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9300 dwarf_tag_name (child_die->tag));
9305 imported_die = follow_die_ref_or_sig (child_die, import_attr,
9307 imported_name = dwarf2_name (imported_die, imported_cu);
9308 if (imported_name == NULL)
9310 complaint (&symfile_complaints,
9311 _("child DW_TAG_imported_declaration has unknown "
9312 "imported name - DIE at 0x%x [in module %s]"),
9313 to_underlying (child_die->sect_off), objfile_name (objfile));
9317 VEC_safe_push (const_char_ptr, excludes, imported_name);
9319 process_die (child_die, cu);
9322 add_using_directive (using_directives (cu->language),
9326 imported_declaration,
9329 &objfile->objfile_obstack);
9331 do_cleanups (cleanups);
9334 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
9335 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
9336 this, it was first present in GCC release 4.3.0. */
9339 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
9341 if (!cu->checked_producer)
9342 check_producer (cu);
9344 return cu->producer_is_gcc_lt_4_3;
9347 static file_and_directory
9348 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
9350 file_and_directory res;
9352 /* Find the filename. Do not use dwarf2_name here, since the filename
9353 is not a source language identifier. */
9354 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
9355 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
9357 if (res.comp_dir == NULL
9358 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
9359 && IS_ABSOLUTE_PATH (res.name))
9361 res.comp_dir_storage = ldirname (res.name);
9362 if (!res.comp_dir_storage.empty ())
9363 res.comp_dir = res.comp_dir_storage.c_str ();
9365 if (res.comp_dir != NULL)
9367 /* Irix 6.2 native cc prepends <machine>.: to the compilation
9368 directory, get rid of it. */
9369 const char *cp = strchr (res.comp_dir, ':');
9371 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
9372 res.comp_dir = cp + 1;
9375 if (res.name == NULL)
9376 res.name = "<unknown>";
9381 /* Handle DW_AT_stmt_list for a compilation unit.
9382 DIE is the DW_TAG_compile_unit die for CU.
9383 COMP_DIR is the compilation directory. LOWPC is passed to
9384 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
9387 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
9388 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
9390 struct objfile *objfile = dwarf2_per_objfile->objfile;
9391 struct attribute *attr;
9392 struct line_header line_header_local;
9393 hashval_t line_header_local_hash;
9398 gdb_assert (! cu->per_cu->is_debug_types);
9400 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9404 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
9406 /* The line header hash table is only created if needed (it exists to
9407 prevent redundant reading of the line table for partial_units).
9408 If we're given a partial_unit, we'll need it. If we're given a
9409 compile_unit, then use the line header hash table if it's already
9410 created, but don't create one just yet. */
9412 if (dwarf2_per_objfile->line_header_hash == NULL
9413 && die->tag == DW_TAG_partial_unit)
9415 dwarf2_per_objfile->line_header_hash
9416 = htab_create_alloc_ex (127, line_header_hash_voidp,
9417 line_header_eq_voidp,
9418 free_line_header_voidp,
9419 &objfile->objfile_obstack,
9420 hashtab_obstack_allocate,
9421 dummy_obstack_deallocate);
9424 line_header_local.sect_off = line_offset;
9425 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
9426 line_header_local_hash = line_header_hash (&line_header_local);
9427 if (dwarf2_per_objfile->line_header_hash != NULL)
9429 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9431 line_header_local_hash, NO_INSERT);
9433 /* For DW_TAG_compile_unit we need info like symtab::linetable which
9434 is not present in *SLOT (since if there is something in *SLOT then
9435 it will be for a partial_unit). */
9436 if (die->tag == DW_TAG_partial_unit && slot != NULL)
9438 gdb_assert (*slot != NULL);
9439 cu->line_header = (struct line_header *) *slot;
9444 /* dwarf_decode_line_header does not yet provide sufficient information.
9445 We always have to call also dwarf_decode_lines for it. */
9446 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
9450 cu->line_header = lh.release ();
9451 cu->line_header_die_owner = die;
9453 if (dwarf2_per_objfile->line_header_hash == NULL)
9457 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
9459 line_header_local_hash, INSERT);
9460 gdb_assert (slot != NULL);
9462 if (slot != NULL && *slot == NULL)
9464 /* This newly decoded line number information unit will be owned
9465 by line_header_hash hash table. */
9466 *slot = cu->line_header;
9467 cu->line_header_die_owner = NULL;
9471 /* We cannot free any current entry in (*slot) as that struct line_header
9472 may be already used by multiple CUs. Create only temporary decoded
9473 line_header for this CU - it may happen at most once for each line
9474 number information unit. And if we're not using line_header_hash
9475 then this is what we want as well. */
9476 gdb_assert (die->tag != DW_TAG_partial_unit);
9478 decode_mapping = (die->tag != DW_TAG_partial_unit);
9479 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
9484 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
9487 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
9489 struct objfile *objfile = dwarf2_per_objfile->objfile;
9490 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9491 CORE_ADDR lowpc = ((CORE_ADDR) -1);
9492 CORE_ADDR highpc = ((CORE_ADDR) 0);
9493 struct attribute *attr;
9494 struct die_info *child_die;
9497 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9499 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
9501 /* If we didn't find a lowpc, set it to highpc to avoid complaints
9502 from finish_block. */
9503 if (lowpc == ((CORE_ADDR) -1))
9505 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
9507 file_and_directory fnd = find_file_and_directory (die, cu);
9509 prepare_one_comp_unit (cu, die, cu->language);
9511 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
9512 standardised yet. As a workaround for the language detection we fall
9513 back to the DW_AT_producer string. */
9514 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
9515 cu->language = language_opencl;
9517 /* Similar hack for Go. */
9518 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
9519 set_cu_language (DW_LANG_Go, cu);
9521 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
9523 /* Decode line number information if present. We do this before
9524 processing child DIEs, so that the line header table is available
9525 for DW_AT_decl_file. */
9526 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
9528 /* Process all dies in compilation unit. */
9529 if (die->child != NULL)
9531 child_die = die->child;
9532 while (child_die && child_die->tag)
9534 process_die (child_die, cu);
9535 child_die = sibling_die (child_die);
9539 /* Decode macro information, if present. Dwarf 2 macro information
9540 refers to information in the line number info statement program
9541 header, so we can only read it if we've read the header
9543 attr = dwarf2_attr (die, DW_AT_macros, cu);
9545 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
9546 if (attr && cu->line_header)
9548 if (dwarf2_attr (die, DW_AT_macro_info, cu))
9549 complaint (&symfile_complaints,
9550 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
9552 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
9556 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
9557 if (attr && cu->line_header)
9559 unsigned int macro_offset = DW_UNSND (attr);
9561 dwarf_decode_macros (cu, macro_offset, 0);
9566 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
9567 Create the set of symtabs used by this TU, or if this TU is sharing
9568 symtabs with another TU and the symtabs have already been created
9569 then restore those symtabs in the line header.
9570 We don't need the pc/line-number mapping for type units. */
9573 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
9575 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
9576 struct type_unit_group *tu_group;
9578 struct attribute *attr;
9580 struct signatured_type *sig_type;
9582 gdb_assert (per_cu->is_debug_types);
9583 sig_type = (struct signatured_type *) per_cu;
9585 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
9587 /* If we're using .gdb_index (includes -readnow) then
9588 per_cu->type_unit_group may not have been set up yet. */
9589 if (sig_type->type_unit_group == NULL)
9590 sig_type->type_unit_group = get_type_unit_group (cu, attr);
9591 tu_group = sig_type->type_unit_group;
9593 /* If we've already processed this stmt_list there's no real need to
9594 do it again, we could fake it and just recreate the part we need
9595 (file name,index -> symtab mapping). If data shows this optimization
9596 is useful we can do it then. */
9597 first_time = tu_group->compunit_symtab == NULL;
9599 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
9604 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
9605 lh = dwarf_decode_line_header (line_offset, cu);
9610 dwarf2_start_symtab (cu, "", NULL, 0);
9613 gdb_assert (tu_group->symtabs == NULL);
9614 restart_symtab (tu_group->compunit_symtab, "", 0);
9619 cu->line_header = lh.release ();
9620 cu->line_header_die_owner = die;
9624 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
9626 /* Note: We don't assign tu_group->compunit_symtab yet because we're
9627 still initializing it, and our caller (a few levels up)
9628 process_full_type_unit still needs to know if this is the first
9631 tu_group->num_symtabs = cu->line_header->file_names.size ();
9632 tu_group->symtabs = XNEWVEC (struct symtab *,
9633 cu->line_header->file_names.size ());
9635 for (i = 0; i < cu->line_header->file_names.size (); ++i)
9637 file_entry &fe = cu->line_header->file_names[i];
9639 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
9641 if (current_subfile->symtab == NULL)
9643 /* NOTE: start_subfile will recognize when it's been
9644 passed a file it has already seen. So we can't
9645 assume there's a simple mapping from
9646 cu->line_header->file_names to subfiles, plus
9647 cu->line_header->file_names may contain dups. */
9648 current_subfile->symtab
9649 = allocate_symtab (cust, current_subfile->name);
9652 fe.symtab = current_subfile->symtab;
9653 tu_group->symtabs[i] = fe.symtab;
9658 restart_symtab (tu_group->compunit_symtab, "", 0);
9660 for (i = 0; i < cu->line_header->file_names.size (); ++i)
9662 file_entry &fe = cu->line_header->file_names[i];
9664 fe.symtab = tu_group->symtabs[i];
9668 /* The main symtab is allocated last. Type units don't have DW_AT_name
9669 so they don't have a "real" (so to speak) symtab anyway.
9670 There is later code that will assign the main symtab to all symbols
9671 that don't have one. We need to handle the case of a symbol with a
9672 missing symtab (DW_AT_decl_file) anyway. */
9675 /* Process DW_TAG_type_unit.
9676 For TUs we want to skip the first top level sibling if it's not the
9677 actual type being defined by this TU. In this case the first top
9678 level sibling is there to provide context only. */
9681 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
9683 struct die_info *child_die;
9685 prepare_one_comp_unit (cu, die, language_minimal);
9687 /* Initialize (or reinitialize) the machinery for building symtabs.
9688 We do this before processing child DIEs, so that the line header table
9689 is available for DW_AT_decl_file. */
9690 setup_type_unit_groups (die, cu);
9692 if (die->child != NULL)
9694 child_die = die->child;
9695 while (child_die && child_die->tag)
9697 process_die (child_die, cu);
9698 child_die = sibling_die (child_die);
9705 http://gcc.gnu.org/wiki/DebugFission
9706 http://gcc.gnu.org/wiki/DebugFissionDWP
9708 To simplify handling of both DWO files ("object" files with the DWARF info)
9709 and DWP files (a file with the DWOs packaged up into one file), we treat
9710 DWP files as having a collection of virtual DWO files. */
9713 hash_dwo_file (const void *item)
9715 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
9718 hash = htab_hash_string (dwo_file->dwo_name);
9719 if (dwo_file->comp_dir != NULL)
9720 hash += htab_hash_string (dwo_file->comp_dir);
9725 eq_dwo_file (const void *item_lhs, const void *item_rhs)
9727 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
9728 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
9730 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
9732 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
9733 return lhs->comp_dir == rhs->comp_dir;
9734 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
9737 /* Allocate a hash table for DWO files. */
9740 allocate_dwo_file_hash_table (void)
9742 struct objfile *objfile = dwarf2_per_objfile->objfile;
9744 return htab_create_alloc_ex (41,
9748 &objfile->objfile_obstack,
9749 hashtab_obstack_allocate,
9750 dummy_obstack_deallocate);
9753 /* Lookup DWO file DWO_NAME. */
9756 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
9758 struct dwo_file find_entry;
9761 if (dwarf2_per_objfile->dwo_files == NULL)
9762 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
9764 memset (&find_entry, 0, sizeof (find_entry));
9765 find_entry.dwo_name = dwo_name;
9766 find_entry.comp_dir = comp_dir;
9767 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
9773 hash_dwo_unit (const void *item)
9775 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
9777 /* This drops the top 32 bits of the id, but is ok for a hash. */
9778 return dwo_unit->signature;
9782 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
9784 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
9785 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
9787 /* The signature is assumed to be unique within the DWO file.
9788 So while object file CU dwo_id's always have the value zero,
9789 that's OK, assuming each object file DWO file has only one CU,
9790 and that's the rule for now. */
9791 return lhs->signature == rhs->signature;
9794 /* Allocate a hash table for DWO CUs,TUs.
9795 There is one of these tables for each of CUs,TUs for each DWO file. */
9798 allocate_dwo_unit_table (struct objfile *objfile)
9800 /* Start out with a pretty small number.
9801 Generally DWO files contain only one CU and maybe some TUs. */
9802 return htab_create_alloc_ex (3,
9806 &objfile->objfile_obstack,
9807 hashtab_obstack_allocate,
9808 dummy_obstack_deallocate);
9811 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
9813 struct create_dwo_cu_data
9815 struct dwo_file *dwo_file;
9816 struct dwo_unit dwo_unit;
9819 /* die_reader_func for create_dwo_cu. */
9822 create_dwo_cu_reader (const struct die_reader_specs *reader,
9823 const gdb_byte *info_ptr,
9824 struct die_info *comp_unit_die,
9828 struct dwarf2_cu *cu = reader->cu;
9829 sect_offset sect_off = cu->per_cu->sect_off;
9830 struct dwarf2_section_info *section = cu->per_cu->section;
9831 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
9832 struct dwo_file *dwo_file = data->dwo_file;
9833 struct dwo_unit *dwo_unit = &data->dwo_unit;
9834 struct attribute *attr;
9836 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
9839 complaint (&symfile_complaints,
9840 _("Dwarf Error: debug entry at offset 0x%x is missing"
9841 " its dwo_id [in module %s]"),
9842 to_underlying (sect_off), dwo_file->dwo_name);
9846 dwo_unit->dwo_file = dwo_file;
9847 dwo_unit->signature = DW_UNSND (attr);
9848 dwo_unit->section = section;
9849 dwo_unit->sect_off = sect_off;
9850 dwo_unit->length = cu->per_cu->length;
9852 if (dwarf_read_debug)
9853 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
9854 to_underlying (sect_off),
9855 hex_string (dwo_unit->signature));
9858 /* Create the dwo_units for the CUs in a DWO_FILE.
9859 Note: This function processes DWO files only, not DWP files. */
9862 create_cus_hash_table (struct dwo_file &dwo_file, dwarf2_section_info §ion,
9865 struct objfile *objfile = dwarf2_per_objfile->objfile;
9866 const struct dwarf2_section_info *abbrev_section = &dwo_file.sections.abbrev;
9867 const gdb_byte *info_ptr, *end_ptr;
9869 dwarf2_read_section (objfile, §ion);
9870 info_ptr = section.buffer;
9872 if (info_ptr == NULL)
9875 if (dwarf_read_debug)
9877 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
9878 get_section_name (§ion),
9879 get_section_file_name (§ion));
9882 end_ptr = info_ptr + section.size;
9883 while (info_ptr < end_ptr)
9885 struct dwarf2_per_cu_data per_cu;
9886 struct create_dwo_cu_data create_dwo_cu_data;
9887 struct dwo_unit *dwo_unit;
9889 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
9891 memset (&create_dwo_cu_data.dwo_unit, 0,
9892 sizeof (create_dwo_cu_data.dwo_unit));
9893 memset (&per_cu, 0, sizeof (per_cu));
9894 per_cu.objfile = objfile;
9895 per_cu.is_debug_types = 0;
9896 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
9897 per_cu.section = §ion;
9898 create_dwo_cu_data.dwo_file = &dwo_file;
9900 init_cutu_and_read_dies_no_follow (
9901 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
9902 info_ptr += per_cu.length;
9904 // If the unit could not be parsed, skip it.
9905 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
9908 if (cus_htab == NULL)
9909 cus_htab = allocate_dwo_unit_table (objfile);
9911 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9912 *dwo_unit = create_dwo_cu_data.dwo_unit;
9913 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
9914 gdb_assert (slot != NULL);
9917 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
9918 sect_offset dup_sect_off = dup_cu->sect_off;
9920 complaint (&symfile_complaints,
9921 _("debug cu entry at offset 0x%x is duplicate to"
9922 " the entry at offset 0x%x, signature %s"),
9923 to_underlying (sect_off), to_underlying (dup_sect_off),
9924 hex_string (dwo_unit->signature));
9926 *slot = (void *)dwo_unit;
9930 /* DWP file .debug_{cu,tu}_index section format:
9931 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
9935 Both index sections have the same format, and serve to map a 64-bit
9936 signature to a set of section numbers. Each section begins with a header,
9937 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
9938 indexes, and a pool of 32-bit section numbers. The index sections will be
9939 aligned at 8-byte boundaries in the file.
9941 The index section header consists of:
9943 V, 32 bit version number
9945 N, 32 bit number of compilation units or type units in the index
9946 M, 32 bit number of slots in the hash table
9948 Numbers are recorded using the byte order of the application binary.
9950 The hash table begins at offset 16 in the section, and consists of an array
9951 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
9952 order of the application binary). Unused slots in the hash table are 0.
9953 (We rely on the extreme unlikeliness of a signature being exactly 0.)
9955 The parallel table begins immediately after the hash table
9956 (at offset 16 + 8 * M from the beginning of the section), and consists of an
9957 array of 32-bit indexes (using the byte order of the application binary),
9958 corresponding 1-1 with slots in the hash table. Each entry in the parallel
9959 table contains a 32-bit index into the pool of section numbers. For unused
9960 hash table slots, the corresponding entry in the parallel table will be 0.
9962 The pool of section numbers begins immediately following the hash table
9963 (at offset 16 + 12 * M from the beginning of the section). The pool of
9964 section numbers consists of an array of 32-bit words (using the byte order
9965 of the application binary). Each item in the array is indexed starting
9966 from 0. The hash table entry provides the index of the first section
9967 number in the set. Additional section numbers in the set follow, and the
9968 set is terminated by a 0 entry (section number 0 is not used in ELF).
9970 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
9971 section must be the first entry in the set, and the .debug_abbrev.dwo must
9972 be the second entry. Other members of the set may follow in any order.
9978 DWP Version 2 combines all the .debug_info, etc. sections into one,
9979 and the entries in the index tables are now offsets into these sections.
9980 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
9983 Index Section Contents:
9985 Hash Table of Signatures dwp_hash_table.hash_table
9986 Parallel Table of Indices dwp_hash_table.unit_table
9987 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
9988 Table of Section Sizes dwp_hash_table.v2.sizes
9990 The index section header consists of:
9992 V, 32 bit version number
9993 L, 32 bit number of columns in the table of section offsets
9994 N, 32 bit number of compilation units or type units in the index
9995 M, 32 bit number of slots in the hash table
9997 Numbers are recorded using the byte order of the application binary.
9999 The hash table has the same format as version 1.
10000 The parallel table of indices has the same format as version 1,
10001 except that the entries are origin-1 indices into the table of sections
10002 offsets and the table of section sizes.
10004 The table of offsets begins immediately following the parallel table
10005 (at offset 16 + 12 * M from the beginning of the section). The table is
10006 a two-dimensional array of 32-bit words (using the byte order of the
10007 application binary), with L columns and N+1 rows, in row-major order.
10008 Each row in the array is indexed starting from 0. The first row provides
10009 a key to the remaining rows: each column in this row provides an identifier
10010 for a debug section, and the offsets in the same column of subsequent rows
10011 refer to that section. The section identifiers are:
10013 DW_SECT_INFO 1 .debug_info.dwo
10014 DW_SECT_TYPES 2 .debug_types.dwo
10015 DW_SECT_ABBREV 3 .debug_abbrev.dwo
10016 DW_SECT_LINE 4 .debug_line.dwo
10017 DW_SECT_LOC 5 .debug_loc.dwo
10018 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
10019 DW_SECT_MACINFO 7 .debug_macinfo.dwo
10020 DW_SECT_MACRO 8 .debug_macro.dwo
10022 The offsets provided by the CU and TU index sections are the base offsets
10023 for the contributions made by each CU or TU to the corresponding section
10024 in the package file. Each CU and TU header contains an abbrev_offset
10025 field, used to find the abbreviations table for that CU or TU within the
10026 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
10027 be interpreted as relative to the base offset given in the index section.
10028 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
10029 should be interpreted as relative to the base offset for .debug_line.dwo,
10030 and offsets into other debug sections obtained from DWARF attributes should
10031 also be interpreted as relative to the corresponding base offset.
10033 The table of sizes begins immediately following the table of offsets.
10034 Like the table of offsets, it is a two-dimensional array of 32-bit words,
10035 with L columns and N rows, in row-major order. Each row in the array is
10036 indexed starting from 1 (row 0 is shared by the two tables).
10040 Hash table lookup is handled the same in version 1 and 2:
10042 We assume that N and M will not exceed 2^32 - 1.
10043 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
10045 Given a 64-bit compilation unit signature or a type signature S, an entry
10046 in the hash table is located as follows:
10048 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
10049 the low-order k bits all set to 1.
10051 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
10053 3) If the hash table entry at index H matches the signature, use that
10054 entry. If the hash table entry at index H is unused (all zeroes),
10055 terminate the search: the signature is not present in the table.
10057 4) Let H = (H + H') modulo M. Repeat at Step 3.
10059 Because M > N and H' and M are relatively prime, the search is guaranteed
10060 to stop at an unused slot or find the match. */
10062 /* Create a hash table to map DWO IDs to their CU/TU entry in
10063 .debug_{info,types}.dwo in DWP_FILE.
10064 Returns NULL if there isn't one.
10065 Note: This function processes DWP files only, not DWO files. */
10067 static struct dwp_hash_table *
10068 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
10070 struct objfile *objfile = dwarf2_per_objfile->objfile;
10071 bfd *dbfd = dwp_file->dbfd;
10072 const gdb_byte *index_ptr, *index_end;
10073 struct dwarf2_section_info *index;
10074 uint32_t version, nr_columns, nr_units, nr_slots;
10075 struct dwp_hash_table *htab;
10077 if (is_debug_types)
10078 index = &dwp_file->sections.tu_index;
10080 index = &dwp_file->sections.cu_index;
10082 if (dwarf2_section_empty_p (index))
10084 dwarf2_read_section (objfile, index);
10086 index_ptr = index->buffer;
10087 index_end = index_ptr + index->size;
10089 version = read_4_bytes (dbfd, index_ptr);
10092 nr_columns = read_4_bytes (dbfd, index_ptr);
10096 nr_units = read_4_bytes (dbfd, index_ptr);
10098 nr_slots = read_4_bytes (dbfd, index_ptr);
10101 if (version != 1 && version != 2)
10103 error (_("Dwarf Error: unsupported DWP file version (%s)"
10104 " [in module %s]"),
10105 pulongest (version), dwp_file->name);
10107 if (nr_slots != (nr_slots & -nr_slots))
10109 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
10110 " is not power of 2 [in module %s]"),
10111 pulongest (nr_slots), dwp_file->name);
10114 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
10115 htab->version = version;
10116 htab->nr_columns = nr_columns;
10117 htab->nr_units = nr_units;
10118 htab->nr_slots = nr_slots;
10119 htab->hash_table = index_ptr;
10120 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
10122 /* Exit early if the table is empty. */
10123 if (nr_slots == 0 || nr_units == 0
10124 || (version == 2 && nr_columns == 0))
10126 /* All must be zero. */
10127 if (nr_slots != 0 || nr_units != 0
10128 || (version == 2 && nr_columns != 0))
10130 complaint (&symfile_complaints,
10131 _("Empty DWP but nr_slots,nr_units,nr_columns not"
10132 " all zero [in modules %s]"),
10140 htab->section_pool.v1.indices =
10141 htab->unit_table + sizeof (uint32_t) * nr_slots;
10142 /* It's harder to decide whether the section is too small in v1.
10143 V1 is deprecated anyway so we punt. */
10147 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
10148 int *ids = htab->section_pool.v2.section_ids;
10149 /* Reverse map for error checking. */
10150 int ids_seen[DW_SECT_MAX + 1];
10153 if (nr_columns < 2)
10155 error (_("Dwarf Error: bad DWP hash table, too few columns"
10156 " in section table [in module %s]"),
10159 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
10161 error (_("Dwarf Error: bad DWP hash table, too many columns"
10162 " in section table [in module %s]"),
10165 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10166 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10167 for (i = 0; i < nr_columns; ++i)
10169 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
10171 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
10173 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
10174 " in section table [in module %s]"),
10175 id, dwp_file->name);
10177 if (ids_seen[id] != -1)
10179 error (_("Dwarf Error: bad DWP hash table, duplicate section"
10180 " id %d in section table [in module %s]"),
10181 id, dwp_file->name);
10186 /* Must have exactly one info or types section. */
10187 if (((ids_seen[DW_SECT_INFO] != -1)
10188 + (ids_seen[DW_SECT_TYPES] != -1))
10191 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
10192 " DWO info/types section [in module %s]"),
10195 /* Must have an abbrev section. */
10196 if (ids_seen[DW_SECT_ABBREV] == -1)
10198 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
10199 " section [in module %s]"),
10202 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
10203 htab->section_pool.v2.sizes =
10204 htab->section_pool.v2.offsets + (sizeof (uint32_t)
10205 * nr_units * nr_columns);
10206 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
10207 * nr_units * nr_columns))
10210 error (_("Dwarf Error: DWP index section is corrupt (too small)"
10211 " [in module %s]"),
10219 /* Update SECTIONS with the data from SECTP.
10221 This function is like the other "locate" section routines that are
10222 passed to bfd_map_over_sections, but in this context the sections to
10223 read comes from the DWP V1 hash table, not the full ELF section table.
10225 The result is non-zero for success, or zero if an error was found. */
10228 locate_v1_virtual_dwo_sections (asection *sectp,
10229 struct virtual_v1_dwo_sections *sections)
10231 const struct dwop_section_names *names = &dwop_section_names;
10233 if (section_is_p (sectp->name, &names->abbrev_dwo))
10235 /* There can be only one. */
10236 if (sections->abbrev.s.section != NULL)
10238 sections->abbrev.s.section = sectp;
10239 sections->abbrev.size = bfd_get_section_size (sectp);
10241 else if (section_is_p (sectp->name, &names->info_dwo)
10242 || section_is_p (sectp->name, &names->types_dwo))
10244 /* There can be only one. */
10245 if (sections->info_or_types.s.section != NULL)
10247 sections->info_or_types.s.section = sectp;
10248 sections->info_or_types.size = bfd_get_section_size (sectp);
10250 else if (section_is_p (sectp->name, &names->line_dwo))
10252 /* There can be only one. */
10253 if (sections->line.s.section != NULL)
10255 sections->line.s.section = sectp;
10256 sections->line.size = bfd_get_section_size (sectp);
10258 else if (section_is_p (sectp->name, &names->loc_dwo))
10260 /* There can be only one. */
10261 if (sections->loc.s.section != NULL)
10263 sections->loc.s.section = sectp;
10264 sections->loc.size = bfd_get_section_size (sectp);
10266 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10268 /* There can be only one. */
10269 if (sections->macinfo.s.section != NULL)
10271 sections->macinfo.s.section = sectp;
10272 sections->macinfo.size = bfd_get_section_size (sectp);
10274 else if (section_is_p (sectp->name, &names->macro_dwo))
10276 /* There can be only one. */
10277 if (sections->macro.s.section != NULL)
10279 sections->macro.s.section = sectp;
10280 sections->macro.size = bfd_get_section_size (sectp);
10282 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10284 /* There can be only one. */
10285 if (sections->str_offsets.s.section != NULL)
10287 sections->str_offsets.s.section = sectp;
10288 sections->str_offsets.size = bfd_get_section_size (sectp);
10292 /* No other kind of section is valid. */
10299 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10300 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10301 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10302 This is for DWP version 1 files. */
10304 static struct dwo_unit *
10305 create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file,
10306 uint32_t unit_index,
10307 const char *comp_dir,
10308 ULONGEST signature, int is_debug_types)
10310 struct objfile *objfile = dwarf2_per_objfile->objfile;
10311 const struct dwp_hash_table *dwp_htab =
10312 is_debug_types ? dwp_file->tus : dwp_file->cus;
10313 bfd *dbfd = dwp_file->dbfd;
10314 const char *kind = is_debug_types ? "TU" : "CU";
10315 struct dwo_file *dwo_file;
10316 struct dwo_unit *dwo_unit;
10317 struct virtual_v1_dwo_sections sections;
10318 void **dwo_file_slot;
10319 char *virtual_dwo_name;
10320 struct cleanup *cleanups;
10323 gdb_assert (dwp_file->version == 1);
10325 if (dwarf_read_debug)
10327 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
10329 pulongest (unit_index), hex_string (signature),
10333 /* Fetch the sections of this DWO unit.
10334 Put a limit on the number of sections we look for so that bad data
10335 doesn't cause us to loop forever. */
10337 #define MAX_NR_V1_DWO_SECTIONS \
10338 (1 /* .debug_info or .debug_types */ \
10339 + 1 /* .debug_abbrev */ \
10340 + 1 /* .debug_line */ \
10341 + 1 /* .debug_loc */ \
10342 + 1 /* .debug_str_offsets */ \
10343 + 1 /* .debug_macro or .debug_macinfo */ \
10344 + 1 /* trailing zero */)
10346 memset (§ions, 0, sizeof (sections));
10347 cleanups = make_cleanup (null_cleanup, 0);
10349 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
10352 uint32_t section_nr =
10353 read_4_bytes (dbfd,
10354 dwp_htab->section_pool.v1.indices
10355 + (unit_index + i) * sizeof (uint32_t));
10357 if (section_nr == 0)
10359 if (section_nr >= dwp_file->num_sections)
10361 error (_("Dwarf Error: bad DWP hash table, section number too large"
10362 " [in module %s]"),
10366 sectp = dwp_file->elf_sections[section_nr];
10367 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
10369 error (_("Dwarf Error: bad DWP hash table, invalid section found"
10370 " [in module %s]"),
10376 || dwarf2_section_empty_p (§ions.info_or_types)
10377 || dwarf2_section_empty_p (§ions.abbrev))
10379 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
10380 " [in module %s]"),
10383 if (i == MAX_NR_V1_DWO_SECTIONS)
10385 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
10386 " [in module %s]"),
10390 /* It's easier for the rest of the code if we fake a struct dwo_file and
10391 have dwo_unit "live" in that. At least for now.
10393 The DWP file can be made up of a random collection of CUs and TUs.
10394 However, for each CU + set of TUs that came from the same original DWO
10395 file, we can combine them back into a virtual DWO file to save space
10396 (fewer struct dwo_file objects to allocate). Remember that for really
10397 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10400 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
10401 get_section_id (§ions.abbrev),
10402 get_section_id (§ions.line),
10403 get_section_id (§ions.loc),
10404 get_section_id (§ions.str_offsets));
10405 make_cleanup (xfree, virtual_dwo_name);
10406 /* Can we use an existing virtual DWO file? */
10407 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10408 /* Create one if necessary. */
10409 if (*dwo_file_slot == NULL)
10411 if (dwarf_read_debug)
10413 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10416 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10418 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10420 strlen (virtual_dwo_name));
10421 dwo_file->comp_dir = comp_dir;
10422 dwo_file->sections.abbrev = sections.abbrev;
10423 dwo_file->sections.line = sections.line;
10424 dwo_file->sections.loc = sections.loc;
10425 dwo_file->sections.macinfo = sections.macinfo;
10426 dwo_file->sections.macro = sections.macro;
10427 dwo_file->sections.str_offsets = sections.str_offsets;
10428 /* The "str" section is global to the entire DWP file. */
10429 dwo_file->sections.str = dwp_file->sections.str;
10430 /* The info or types section is assigned below to dwo_unit,
10431 there's no need to record it in dwo_file.
10432 Also, we can't simply record type sections in dwo_file because
10433 we record a pointer into the vector in dwo_unit. As we collect more
10434 types we'll grow the vector and eventually have to reallocate space
10435 for it, invalidating all copies of pointers into the previous
10437 *dwo_file_slot = dwo_file;
10441 if (dwarf_read_debug)
10443 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10446 dwo_file = (struct dwo_file *) *dwo_file_slot;
10448 do_cleanups (cleanups);
10450 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10451 dwo_unit->dwo_file = dwo_file;
10452 dwo_unit->signature = signature;
10453 dwo_unit->section =
10454 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10455 *dwo_unit->section = sections.info_or_types;
10456 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10461 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
10462 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
10463 piece within that section used by a TU/CU, return a virtual section
10464 of just that piece. */
10466 static struct dwarf2_section_info
10467 create_dwp_v2_section (struct dwarf2_section_info *section,
10468 bfd_size_type offset, bfd_size_type size)
10470 struct dwarf2_section_info result;
10473 gdb_assert (section != NULL);
10474 gdb_assert (!section->is_virtual);
10476 memset (&result, 0, sizeof (result));
10477 result.s.containing_section = section;
10478 result.is_virtual = 1;
10483 sectp = get_section_bfd_section (section);
10485 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
10486 bounds of the real section. This is a pretty-rare event, so just
10487 flag an error (easier) instead of a warning and trying to cope. */
10489 || offset + size > bfd_get_section_size (sectp))
10491 bfd *abfd = sectp->owner;
10493 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
10494 " in section %s [in module %s]"),
10495 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
10496 objfile_name (dwarf2_per_objfile->objfile));
10499 result.virtual_offset = offset;
10500 result.size = size;
10504 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10505 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10506 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10507 This is for DWP version 2 files. */
10509 static struct dwo_unit *
10510 create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file,
10511 uint32_t unit_index,
10512 const char *comp_dir,
10513 ULONGEST signature, int is_debug_types)
10515 struct objfile *objfile = dwarf2_per_objfile->objfile;
10516 const struct dwp_hash_table *dwp_htab =
10517 is_debug_types ? dwp_file->tus : dwp_file->cus;
10518 bfd *dbfd = dwp_file->dbfd;
10519 const char *kind = is_debug_types ? "TU" : "CU";
10520 struct dwo_file *dwo_file;
10521 struct dwo_unit *dwo_unit;
10522 struct virtual_v2_dwo_sections sections;
10523 void **dwo_file_slot;
10524 char *virtual_dwo_name;
10525 struct cleanup *cleanups;
10528 gdb_assert (dwp_file->version == 2);
10530 if (dwarf_read_debug)
10532 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
10534 pulongest (unit_index), hex_string (signature),
10538 /* Fetch the section offsets of this DWO unit. */
10540 memset (§ions, 0, sizeof (sections));
10541 cleanups = make_cleanup (null_cleanup, 0);
10543 for (i = 0; i < dwp_htab->nr_columns; ++i)
10545 uint32_t offset = read_4_bytes (dbfd,
10546 dwp_htab->section_pool.v2.offsets
10547 + (((unit_index - 1) * dwp_htab->nr_columns
10549 * sizeof (uint32_t)));
10550 uint32_t size = read_4_bytes (dbfd,
10551 dwp_htab->section_pool.v2.sizes
10552 + (((unit_index - 1) * dwp_htab->nr_columns
10554 * sizeof (uint32_t)));
10556 switch (dwp_htab->section_pool.v2.section_ids[i])
10559 case DW_SECT_TYPES:
10560 sections.info_or_types_offset = offset;
10561 sections.info_or_types_size = size;
10563 case DW_SECT_ABBREV:
10564 sections.abbrev_offset = offset;
10565 sections.abbrev_size = size;
10568 sections.line_offset = offset;
10569 sections.line_size = size;
10572 sections.loc_offset = offset;
10573 sections.loc_size = size;
10575 case DW_SECT_STR_OFFSETS:
10576 sections.str_offsets_offset = offset;
10577 sections.str_offsets_size = size;
10579 case DW_SECT_MACINFO:
10580 sections.macinfo_offset = offset;
10581 sections.macinfo_size = size;
10583 case DW_SECT_MACRO:
10584 sections.macro_offset = offset;
10585 sections.macro_size = size;
10590 /* It's easier for the rest of the code if we fake a struct dwo_file and
10591 have dwo_unit "live" in that. At least for now.
10593 The DWP file can be made up of a random collection of CUs and TUs.
10594 However, for each CU + set of TUs that came from the same original DWO
10595 file, we can combine them back into a virtual DWO file to save space
10596 (fewer struct dwo_file objects to allocate). Remember that for really
10597 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10600 xstrprintf ("virtual-dwo/%ld-%ld-%ld-%ld",
10601 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
10602 (long) (sections.line_size ? sections.line_offset : 0),
10603 (long) (sections.loc_size ? sections.loc_offset : 0),
10604 (long) (sections.str_offsets_size
10605 ? sections.str_offsets_offset : 0));
10606 make_cleanup (xfree, virtual_dwo_name);
10607 /* Can we use an existing virtual DWO file? */
10608 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
10609 /* Create one if necessary. */
10610 if (*dwo_file_slot == NULL)
10612 if (dwarf_read_debug)
10614 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
10617 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10619 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
10621 strlen (virtual_dwo_name));
10622 dwo_file->comp_dir = comp_dir;
10623 dwo_file->sections.abbrev =
10624 create_dwp_v2_section (&dwp_file->sections.abbrev,
10625 sections.abbrev_offset, sections.abbrev_size);
10626 dwo_file->sections.line =
10627 create_dwp_v2_section (&dwp_file->sections.line,
10628 sections.line_offset, sections.line_size);
10629 dwo_file->sections.loc =
10630 create_dwp_v2_section (&dwp_file->sections.loc,
10631 sections.loc_offset, sections.loc_size);
10632 dwo_file->sections.macinfo =
10633 create_dwp_v2_section (&dwp_file->sections.macinfo,
10634 sections.macinfo_offset, sections.macinfo_size);
10635 dwo_file->sections.macro =
10636 create_dwp_v2_section (&dwp_file->sections.macro,
10637 sections.macro_offset, sections.macro_size);
10638 dwo_file->sections.str_offsets =
10639 create_dwp_v2_section (&dwp_file->sections.str_offsets,
10640 sections.str_offsets_offset,
10641 sections.str_offsets_size);
10642 /* The "str" section is global to the entire DWP file. */
10643 dwo_file->sections.str = dwp_file->sections.str;
10644 /* The info or types section is assigned below to dwo_unit,
10645 there's no need to record it in dwo_file.
10646 Also, we can't simply record type sections in dwo_file because
10647 we record a pointer into the vector in dwo_unit. As we collect more
10648 types we'll grow the vector and eventually have to reallocate space
10649 for it, invalidating all copies of pointers into the previous
10651 *dwo_file_slot = dwo_file;
10655 if (dwarf_read_debug)
10657 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
10660 dwo_file = (struct dwo_file *) *dwo_file_slot;
10662 do_cleanups (cleanups);
10664 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10665 dwo_unit->dwo_file = dwo_file;
10666 dwo_unit->signature = signature;
10667 dwo_unit->section =
10668 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
10669 *dwo_unit->section = create_dwp_v2_section (is_debug_types
10670 ? &dwp_file->sections.types
10671 : &dwp_file->sections.info,
10672 sections.info_or_types_offset,
10673 sections.info_or_types_size);
10674 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
10679 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
10680 Returns NULL if the signature isn't found. */
10682 static struct dwo_unit *
10683 lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir,
10684 ULONGEST signature, int is_debug_types)
10686 const struct dwp_hash_table *dwp_htab =
10687 is_debug_types ? dwp_file->tus : dwp_file->cus;
10688 bfd *dbfd = dwp_file->dbfd;
10689 uint32_t mask = dwp_htab->nr_slots - 1;
10690 uint32_t hash = signature & mask;
10691 uint32_t hash2 = ((signature >> 32) & mask) | 1;
10694 struct dwo_unit find_dwo_cu;
10696 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
10697 find_dwo_cu.signature = signature;
10698 slot = htab_find_slot (is_debug_types
10699 ? dwp_file->loaded_tus
10700 : dwp_file->loaded_cus,
10701 &find_dwo_cu, INSERT);
10704 return (struct dwo_unit *) *slot;
10706 /* Use a for loop so that we don't loop forever on bad debug info. */
10707 for (i = 0; i < dwp_htab->nr_slots; ++i)
10709 ULONGEST signature_in_table;
10711 signature_in_table =
10712 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
10713 if (signature_in_table == signature)
10715 uint32_t unit_index =
10716 read_4_bytes (dbfd,
10717 dwp_htab->unit_table + hash * sizeof (uint32_t));
10719 if (dwp_file->version == 1)
10721 *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index,
10722 comp_dir, signature,
10727 *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index,
10728 comp_dir, signature,
10731 return (struct dwo_unit *) *slot;
10733 if (signature_in_table == 0)
10735 hash = (hash + hash2) & mask;
10738 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
10739 " [in module %s]"),
10743 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
10744 Open the file specified by FILE_NAME and hand it off to BFD for
10745 preliminary analysis. Return a newly initialized bfd *, which
10746 includes a canonicalized copy of FILE_NAME.
10747 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
10748 SEARCH_CWD is true if the current directory is to be searched.
10749 It will be searched before debug-file-directory.
10750 If successful, the file is added to the bfd include table of the
10751 objfile's bfd (see gdb_bfd_record_inclusion).
10752 If unable to find/open the file, return NULL.
10753 NOTE: This function is derived from symfile_bfd_open. */
10755 static gdb_bfd_ref_ptr
10756 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
10759 char *absolute_name;
10760 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
10761 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
10762 to debug_file_directory. */
10764 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
10768 if (*debug_file_directory != '\0')
10769 search_path = concat (".", dirname_separator_string,
10770 debug_file_directory, (char *) NULL);
10772 search_path = xstrdup (".");
10775 search_path = xstrdup (debug_file_directory);
10777 flags = OPF_RETURN_REALPATH;
10779 flags |= OPF_SEARCH_IN_PATH;
10780 desc = openp (search_path, flags, file_name,
10781 O_RDONLY | O_BINARY, &absolute_name);
10782 xfree (search_path);
10786 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name, gnutarget, desc));
10787 xfree (absolute_name);
10788 if (sym_bfd == NULL)
10790 bfd_set_cacheable (sym_bfd.get (), 1);
10792 if (!bfd_check_format (sym_bfd.get (), bfd_object))
10795 /* Success. Record the bfd as having been included by the objfile's bfd.
10796 This is important because things like demangled_names_hash lives in the
10797 objfile's per_bfd space and may have references to things like symbol
10798 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
10799 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
10804 /* Try to open DWO file FILE_NAME.
10805 COMP_DIR is the DW_AT_comp_dir attribute.
10806 The result is the bfd handle of the file.
10807 If there is a problem finding or opening the file, return NULL.
10808 Upon success, the canonicalized path of the file is stored in the bfd,
10809 same as symfile_bfd_open. */
10811 static gdb_bfd_ref_ptr
10812 open_dwo_file (const char *file_name, const char *comp_dir)
10814 if (IS_ABSOLUTE_PATH (file_name))
10815 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
10817 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
10819 if (comp_dir != NULL)
10821 char *path_to_try = concat (comp_dir, SLASH_STRING,
10822 file_name, (char *) NULL);
10824 /* NOTE: If comp_dir is a relative path, this will also try the
10825 search path, which seems useful. */
10826 gdb_bfd_ref_ptr abfd (try_open_dwop_file (path_to_try, 0 /*is_dwp*/,
10827 1 /*search_cwd*/));
10828 xfree (path_to_try);
10833 /* That didn't work, try debug-file-directory, which, despite its name,
10834 is a list of paths. */
10836 if (*debug_file_directory == '\0')
10839 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
10842 /* This function is mapped across the sections and remembers the offset and
10843 size of each of the DWO debugging sections we are interested in. */
10846 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
10848 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
10849 const struct dwop_section_names *names = &dwop_section_names;
10851 if (section_is_p (sectp->name, &names->abbrev_dwo))
10853 dwo_sections->abbrev.s.section = sectp;
10854 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
10856 else if (section_is_p (sectp->name, &names->info_dwo))
10858 dwo_sections->info.s.section = sectp;
10859 dwo_sections->info.size = bfd_get_section_size (sectp);
10861 else if (section_is_p (sectp->name, &names->line_dwo))
10863 dwo_sections->line.s.section = sectp;
10864 dwo_sections->line.size = bfd_get_section_size (sectp);
10866 else if (section_is_p (sectp->name, &names->loc_dwo))
10868 dwo_sections->loc.s.section = sectp;
10869 dwo_sections->loc.size = bfd_get_section_size (sectp);
10871 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10873 dwo_sections->macinfo.s.section = sectp;
10874 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
10876 else if (section_is_p (sectp->name, &names->macro_dwo))
10878 dwo_sections->macro.s.section = sectp;
10879 dwo_sections->macro.size = bfd_get_section_size (sectp);
10881 else if (section_is_p (sectp->name, &names->str_dwo))
10883 dwo_sections->str.s.section = sectp;
10884 dwo_sections->str.size = bfd_get_section_size (sectp);
10886 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10888 dwo_sections->str_offsets.s.section = sectp;
10889 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
10891 else if (section_is_p (sectp->name, &names->types_dwo))
10893 struct dwarf2_section_info type_section;
10895 memset (&type_section, 0, sizeof (type_section));
10896 type_section.s.section = sectp;
10897 type_section.size = bfd_get_section_size (sectp);
10898 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
10903 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
10904 by PER_CU. This is for the non-DWP case.
10905 The result is NULL if DWO_NAME can't be found. */
10907 static struct dwo_file *
10908 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
10909 const char *dwo_name, const char *comp_dir)
10911 struct objfile *objfile = dwarf2_per_objfile->objfile;
10912 struct dwo_file *dwo_file;
10913 struct cleanup *cleanups;
10915 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwo_name, comp_dir));
10918 if (dwarf_read_debug)
10919 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
10922 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
10923 dwo_file->dwo_name = dwo_name;
10924 dwo_file->comp_dir = comp_dir;
10925 dwo_file->dbfd = dbfd.release ();
10927 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
10929 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
10930 &dwo_file->sections);
10932 create_cus_hash_table (*dwo_file, dwo_file->sections.info, dwo_file->cus);
10934 create_debug_types_hash_table (dwo_file, dwo_file->sections.types,
10937 discard_cleanups (cleanups);
10939 if (dwarf_read_debug)
10940 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
10945 /* This function is mapped across the sections and remembers the offset and
10946 size of each of the DWP debugging sections common to version 1 and 2 that
10947 we are interested in. */
10950 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
10951 void *dwp_file_ptr)
10953 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
10954 const struct dwop_section_names *names = &dwop_section_names;
10955 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10957 /* Record the ELF section number for later lookup: this is what the
10958 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10959 gdb_assert (elf_section_nr < dwp_file->num_sections);
10960 dwp_file->elf_sections[elf_section_nr] = sectp;
10962 /* Look for specific sections that we need. */
10963 if (section_is_p (sectp->name, &names->str_dwo))
10965 dwp_file->sections.str.s.section = sectp;
10966 dwp_file->sections.str.size = bfd_get_section_size (sectp);
10968 else if (section_is_p (sectp->name, &names->cu_index))
10970 dwp_file->sections.cu_index.s.section = sectp;
10971 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
10973 else if (section_is_p (sectp->name, &names->tu_index))
10975 dwp_file->sections.tu_index.s.section = sectp;
10976 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
10980 /* This function is mapped across the sections and remembers the offset and
10981 size of each of the DWP version 2 debugging sections that we are interested
10982 in. This is split into a separate function because we don't know if we
10983 have version 1 or 2 until we parse the cu_index/tu_index sections. */
10986 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
10988 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
10989 const struct dwop_section_names *names = &dwop_section_names;
10990 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
10992 /* Record the ELF section number for later lookup: this is what the
10993 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
10994 gdb_assert (elf_section_nr < dwp_file->num_sections);
10995 dwp_file->elf_sections[elf_section_nr] = sectp;
10997 /* Look for specific sections that we need. */
10998 if (section_is_p (sectp->name, &names->abbrev_dwo))
11000 dwp_file->sections.abbrev.s.section = sectp;
11001 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
11003 else if (section_is_p (sectp->name, &names->info_dwo))
11005 dwp_file->sections.info.s.section = sectp;
11006 dwp_file->sections.info.size = bfd_get_section_size (sectp);
11008 else if (section_is_p (sectp->name, &names->line_dwo))
11010 dwp_file->sections.line.s.section = sectp;
11011 dwp_file->sections.line.size = bfd_get_section_size (sectp);
11013 else if (section_is_p (sectp->name, &names->loc_dwo))
11015 dwp_file->sections.loc.s.section = sectp;
11016 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
11018 else if (section_is_p (sectp->name, &names->macinfo_dwo))
11020 dwp_file->sections.macinfo.s.section = sectp;
11021 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
11023 else if (section_is_p (sectp->name, &names->macro_dwo))
11025 dwp_file->sections.macro.s.section = sectp;
11026 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
11028 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
11030 dwp_file->sections.str_offsets.s.section = sectp;
11031 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
11033 else if (section_is_p (sectp->name, &names->types_dwo))
11035 dwp_file->sections.types.s.section = sectp;
11036 dwp_file->sections.types.size = bfd_get_section_size (sectp);
11040 /* Hash function for dwp_file loaded CUs/TUs. */
11043 hash_dwp_loaded_cutus (const void *item)
11045 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11047 /* This drops the top 32 bits of the signature, but is ok for a hash. */
11048 return dwo_unit->signature;
11051 /* Equality function for dwp_file loaded CUs/TUs. */
11054 eq_dwp_loaded_cutus (const void *a, const void *b)
11056 const struct dwo_unit *dua = (const struct dwo_unit *) a;
11057 const struct dwo_unit *dub = (const struct dwo_unit *) b;
11059 return dua->signature == dub->signature;
11062 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
11065 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
11067 return htab_create_alloc_ex (3,
11068 hash_dwp_loaded_cutus,
11069 eq_dwp_loaded_cutus,
11071 &objfile->objfile_obstack,
11072 hashtab_obstack_allocate,
11073 dummy_obstack_deallocate);
11076 /* Try to open DWP file FILE_NAME.
11077 The result is the bfd handle of the file.
11078 If there is a problem finding or opening the file, return NULL.
11079 Upon success, the canonicalized path of the file is stored in the bfd,
11080 same as symfile_bfd_open. */
11082 static gdb_bfd_ref_ptr
11083 open_dwp_file (const char *file_name)
11085 gdb_bfd_ref_ptr abfd (try_open_dwop_file (file_name, 1 /*is_dwp*/,
11086 1 /*search_cwd*/));
11090 /* Work around upstream bug 15652.
11091 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
11092 [Whether that's a "bug" is debatable, but it is getting in our way.]
11093 We have no real idea where the dwp file is, because gdb's realpath-ing
11094 of the executable's path may have discarded the needed info.
11095 [IWBN if the dwp file name was recorded in the executable, akin to
11096 .gnu_debuglink, but that doesn't exist yet.]
11097 Strip the directory from FILE_NAME and search again. */
11098 if (*debug_file_directory != '\0')
11100 /* Don't implicitly search the current directory here.
11101 If the user wants to search "." to handle this case,
11102 it must be added to debug-file-directory. */
11103 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
11110 /* Initialize the use of the DWP file for the current objfile.
11111 By convention the name of the DWP file is ${objfile}.dwp.
11112 The result is NULL if it can't be found. */
11114 static struct dwp_file *
11115 open_and_init_dwp_file (void)
11117 struct objfile *objfile = dwarf2_per_objfile->objfile;
11118 struct dwp_file *dwp_file;
11120 /* Try to find first .dwp for the binary file before any symbolic links
11123 /* If the objfile is a debug file, find the name of the real binary
11124 file and get the name of dwp file from there. */
11125 std::string dwp_name;
11126 if (objfile->separate_debug_objfile_backlink != NULL)
11128 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
11129 const char *backlink_basename = lbasename (backlink->original_name);
11131 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
11134 dwp_name = objfile->original_name;
11136 dwp_name += ".dwp";
11138 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwp_name.c_str ()));
11140 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
11142 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
11143 dwp_name = objfile_name (objfile);
11144 dwp_name += ".dwp";
11145 dbfd = open_dwp_file (dwp_name.c_str ());
11150 if (dwarf_read_debug)
11151 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
11154 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
11155 dwp_file->name = bfd_get_filename (dbfd.get ());
11156 dwp_file->dbfd = dbfd.release ();
11158 /* +1: section 0 is unused */
11159 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
11160 dwp_file->elf_sections =
11161 OBSTACK_CALLOC (&objfile->objfile_obstack,
11162 dwp_file->num_sections, asection *);
11164 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
11167 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
11169 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
11171 /* The DWP file version is stored in the hash table. Oh well. */
11172 if (dwp_file->cus->version != dwp_file->tus->version)
11174 /* Technically speaking, we should try to limp along, but this is
11175 pretty bizarre. We use pulongest here because that's the established
11176 portability solution (e.g, we cannot use %u for uint32_t). */
11177 error (_("Dwarf Error: DWP file CU version %s doesn't match"
11178 " TU version %s [in DWP file %s]"),
11179 pulongest (dwp_file->cus->version),
11180 pulongest (dwp_file->tus->version), dwp_name.c_str ());
11182 dwp_file->version = dwp_file->cus->version;
11184 if (dwp_file->version == 2)
11185 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
11188 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
11189 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
11191 if (dwarf_read_debug)
11193 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
11194 fprintf_unfiltered (gdb_stdlog,
11195 " %s CUs, %s TUs\n",
11196 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
11197 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
11203 /* Wrapper around open_and_init_dwp_file, only open it once. */
11205 static struct dwp_file *
11206 get_dwp_file (void)
11208 if (! dwarf2_per_objfile->dwp_checked)
11210 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
11211 dwarf2_per_objfile->dwp_checked = 1;
11213 return dwarf2_per_objfile->dwp_file;
11216 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
11217 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
11218 or in the DWP file for the objfile, referenced by THIS_UNIT.
11219 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
11220 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
11222 This is called, for example, when wanting to read a variable with a
11223 complex location. Therefore we don't want to do file i/o for every call.
11224 Therefore we don't want to look for a DWO file on every call.
11225 Therefore we first see if we've already seen SIGNATURE in a DWP file,
11226 then we check if we've already seen DWO_NAME, and only THEN do we check
11229 The result is a pointer to the dwo_unit object or NULL if we didn't find it
11230 (dwo_id mismatch or couldn't find the DWO/DWP file). */
11232 static struct dwo_unit *
11233 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
11234 const char *dwo_name, const char *comp_dir,
11235 ULONGEST signature, int is_debug_types)
11237 struct objfile *objfile = dwarf2_per_objfile->objfile;
11238 const char *kind = is_debug_types ? "TU" : "CU";
11239 void **dwo_file_slot;
11240 struct dwo_file *dwo_file;
11241 struct dwp_file *dwp_file;
11243 /* First see if there's a DWP file.
11244 If we have a DWP file but didn't find the DWO inside it, don't
11245 look for the original DWO file. It makes gdb behave differently
11246 depending on whether one is debugging in the build tree. */
11248 dwp_file = get_dwp_file ();
11249 if (dwp_file != NULL)
11251 const struct dwp_hash_table *dwp_htab =
11252 is_debug_types ? dwp_file->tus : dwp_file->cus;
11254 if (dwp_htab != NULL)
11256 struct dwo_unit *dwo_cutu =
11257 lookup_dwo_unit_in_dwp (dwp_file, comp_dir,
11258 signature, is_debug_types);
11260 if (dwo_cutu != NULL)
11262 if (dwarf_read_debug)
11264 fprintf_unfiltered (gdb_stdlog,
11265 "Virtual DWO %s %s found: @%s\n",
11266 kind, hex_string (signature),
11267 host_address_to_string (dwo_cutu));
11275 /* No DWP file, look for the DWO file. */
11277 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
11278 if (*dwo_file_slot == NULL)
11280 /* Read in the file and build a table of the CUs/TUs it contains. */
11281 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
11283 /* NOTE: This will be NULL if unable to open the file. */
11284 dwo_file = (struct dwo_file *) *dwo_file_slot;
11286 if (dwo_file != NULL)
11288 struct dwo_unit *dwo_cutu = NULL;
11290 if (is_debug_types && dwo_file->tus)
11292 struct dwo_unit find_dwo_cutu;
11294 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11295 find_dwo_cutu.signature = signature;
11297 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
11299 else if (!is_debug_types && dwo_file->cus)
11301 struct dwo_unit find_dwo_cutu;
11303 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11304 find_dwo_cutu.signature = signature;
11305 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
11309 if (dwo_cutu != NULL)
11311 if (dwarf_read_debug)
11313 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
11314 kind, dwo_name, hex_string (signature),
11315 host_address_to_string (dwo_cutu));
11322 /* We didn't find it. This could mean a dwo_id mismatch, or
11323 someone deleted the DWO/DWP file, or the search path isn't set up
11324 correctly to find the file. */
11326 if (dwarf_read_debug)
11328 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
11329 kind, dwo_name, hex_string (signature));
11332 /* This is a warning and not a complaint because it can be caused by
11333 pilot error (e.g., user accidentally deleting the DWO). */
11335 /* Print the name of the DWP file if we looked there, helps the user
11336 better diagnose the problem. */
11337 char *dwp_text = NULL;
11338 struct cleanup *cleanups;
11340 if (dwp_file != NULL)
11341 dwp_text = xstrprintf (" [in DWP file %s]", lbasename (dwp_file->name));
11342 cleanups = make_cleanup (xfree, dwp_text);
11344 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
11345 " [in module %s]"),
11346 kind, dwo_name, hex_string (signature),
11347 dwp_text != NULL ? dwp_text : "",
11348 this_unit->is_debug_types ? "TU" : "CU",
11349 to_underlying (this_unit->sect_off), objfile_name (objfile));
11351 do_cleanups (cleanups);
11356 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
11357 See lookup_dwo_cutu_unit for details. */
11359 static struct dwo_unit *
11360 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
11361 const char *dwo_name, const char *comp_dir,
11362 ULONGEST signature)
11364 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
11367 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
11368 See lookup_dwo_cutu_unit for details. */
11370 static struct dwo_unit *
11371 lookup_dwo_type_unit (struct signatured_type *this_tu,
11372 const char *dwo_name, const char *comp_dir)
11374 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
11377 /* Traversal function for queue_and_load_all_dwo_tus. */
11380 queue_and_load_dwo_tu (void **slot, void *info)
11382 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
11383 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
11384 ULONGEST signature = dwo_unit->signature;
11385 struct signatured_type *sig_type =
11386 lookup_dwo_signatured_type (per_cu->cu, signature);
11388 if (sig_type != NULL)
11390 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
11392 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
11393 a real dependency of PER_CU on SIG_TYPE. That is detected later
11394 while processing PER_CU. */
11395 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
11396 load_full_type_unit (sig_cu);
11397 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
11403 /* Queue all TUs contained in the DWO of PER_CU to be read in.
11404 The DWO may have the only definition of the type, though it may not be
11405 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
11406 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
11409 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
11411 struct dwo_unit *dwo_unit;
11412 struct dwo_file *dwo_file;
11414 gdb_assert (!per_cu->is_debug_types);
11415 gdb_assert (get_dwp_file () == NULL);
11416 gdb_assert (per_cu->cu != NULL);
11418 dwo_unit = per_cu->cu->dwo_unit;
11419 gdb_assert (dwo_unit != NULL);
11421 dwo_file = dwo_unit->dwo_file;
11422 if (dwo_file->tus != NULL)
11423 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
11426 /* Free all resources associated with DWO_FILE.
11427 Close the DWO file and munmap the sections.
11428 All memory should be on the objfile obstack. */
11431 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
11434 /* Note: dbfd is NULL for virtual DWO files. */
11435 gdb_bfd_unref (dwo_file->dbfd);
11437 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
11440 /* Wrapper for free_dwo_file for use in cleanups. */
11443 free_dwo_file_cleanup (void *arg)
11445 struct dwo_file *dwo_file = (struct dwo_file *) arg;
11446 struct objfile *objfile = dwarf2_per_objfile->objfile;
11448 free_dwo_file (dwo_file, objfile);
11451 /* Traversal function for free_dwo_files. */
11454 free_dwo_file_from_slot (void **slot, void *info)
11456 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
11457 struct objfile *objfile = (struct objfile *) info;
11459 free_dwo_file (dwo_file, objfile);
11464 /* Free all resources associated with DWO_FILES. */
11467 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
11469 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
11472 /* Read in various DIEs. */
11474 /* qsort helper for inherit_abstract_dies. */
11477 unsigned_int_compar (const void *ap, const void *bp)
11479 unsigned int a = *(unsigned int *) ap;
11480 unsigned int b = *(unsigned int *) bp;
11482 return (a > b) - (b > a);
11485 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
11486 Inherit only the children of the DW_AT_abstract_origin DIE not being
11487 already referenced by DW_AT_abstract_origin from the children of the
11491 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
11493 struct die_info *child_die;
11494 unsigned die_children_count;
11495 /* CU offsets which were referenced by children of the current DIE. */
11496 sect_offset *offsets;
11497 sect_offset *offsets_end, *offsetp;
11498 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
11499 struct die_info *origin_die;
11500 /* Iterator of the ORIGIN_DIE children. */
11501 struct die_info *origin_child_die;
11502 struct cleanup *cleanups;
11503 struct attribute *attr;
11504 struct dwarf2_cu *origin_cu;
11505 struct pending **origin_previous_list_in_scope;
11507 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
11511 /* Note that following die references may follow to a die in a
11515 origin_die = follow_die_ref (die, attr, &origin_cu);
11517 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
11519 origin_previous_list_in_scope = origin_cu->list_in_scope;
11520 origin_cu->list_in_scope = cu->list_in_scope;
11522 if (die->tag != origin_die->tag
11523 && !(die->tag == DW_TAG_inlined_subroutine
11524 && origin_die->tag == DW_TAG_subprogram))
11525 complaint (&symfile_complaints,
11526 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
11527 to_underlying (die->sect_off),
11528 to_underlying (origin_die->sect_off));
11530 child_die = die->child;
11531 die_children_count = 0;
11532 while (child_die && child_die->tag)
11534 child_die = sibling_die (child_die);
11535 die_children_count++;
11537 offsets = XNEWVEC (sect_offset, die_children_count);
11538 cleanups = make_cleanup (xfree, offsets);
11540 offsets_end = offsets;
11541 for (child_die = die->child;
11542 child_die && child_die->tag;
11543 child_die = sibling_die (child_die))
11545 struct die_info *child_origin_die;
11546 struct dwarf2_cu *child_origin_cu;
11548 /* We are trying to process concrete instance entries:
11549 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
11550 it's not relevant to our analysis here. i.e. detecting DIEs that are
11551 present in the abstract instance but not referenced in the concrete
11553 if (child_die->tag == DW_TAG_call_site
11554 || child_die->tag == DW_TAG_GNU_call_site)
11557 /* For each CHILD_DIE, find the corresponding child of
11558 ORIGIN_DIE. If there is more than one layer of
11559 DW_AT_abstract_origin, follow them all; there shouldn't be,
11560 but GCC versions at least through 4.4 generate this (GCC PR
11562 child_origin_die = child_die;
11563 child_origin_cu = cu;
11566 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
11570 child_origin_die = follow_die_ref (child_origin_die, attr,
11574 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
11575 counterpart may exist. */
11576 if (child_origin_die != child_die)
11578 if (child_die->tag != child_origin_die->tag
11579 && !(child_die->tag == DW_TAG_inlined_subroutine
11580 && child_origin_die->tag == DW_TAG_subprogram))
11581 complaint (&symfile_complaints,
11582 _("Child DIE 0x%x and its abstract origin 0x%x have "
11584 to_underlying (child_die->sect_off),
11585 to_underlying (child_origin_die->sect_off));
11586 if (child_origin_die->parent != origin_die)
11587 complaint (&symfile_complaints,
11588 _("Child DIE 0x%x and its abstract origin 0x%x have "
11589 "different parents"),
11590 to_underlying (child_die->sect_off),
11591 to_underlying (child_origin_die->sect_off));
11593 *offsets_end++ = child_origin_die->sect_off;
11596 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
11597 unsigned_int_compar);
11598 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
11599 if (offsetp[-1] == *offsetp)
11600 complaint (&symfile_complaints,
11601 _("Multiple children of DIE 0x%x refer "
11602 "to DIE 0x%x as their abstract origin"),
11603 to_underlying (die->sect_off), to_underlying (*offsetp));
11606 origin_child_die = origin_die->child;
11607 while (origin_child_die && origin_child_die->tag)
11609 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
11610 while (offsetp < offsets_end
11611 && *offsetp < origin_child_die->sect_off)
11613 if (offsetp >= offsets_end
11614 || *offsetp > origin_child_die->sect_off)
11616 /* Found that ORIGIN_CHILD_DIE is really not referenced.
11617 Check whether we're already processing ORIGIN_CHILD_DIE.
11618 This can happen with mutually referenced abstract_origins.
11620 if (!origin_child_die->in_process)
11621 process_die (origin_child_die, origin_cu);
11623 origin_child_die = sibling_die (origin_child_die);
11625 origin_cu->list_in_scope = origin_previous_list_in_scope;
11627 do_cleanups (cleanups);
11631 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
11633 struct objfile *objfile = cu->objfile;
11634 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11635 struct context_stack *newobj;
11638 struct die_info *child_die;
11639 struct attribute *attr, *call_line, *call_file;
11641 CORE_ADDR baseaddr;
11642 struct block *block;
11643 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
11644 VEC (symbolp) *template_args = NULL;
11645 struct template_symbol *templ_func = NULL;
11649 /* If we do not have call site information, we can't show the
11650 caller of this inlined function. That's too confusing, so
11651 only use the scope for local variables. */
11652 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
11653 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
11654 if (call_line == NULL || call_file == NULL)
11656 read_lexical_block_scope (die, cu);
11661 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11663 name = dwarf2_name (die, cu);
11665 /* Ignore functions with missing or empty names. These are actually
11666 illegal according to the DWARF standard. */
11669 complaint (&symfile_complaints,
11670 _("missing name for subprogram DIE at %d"),
11671 to_underlying (die->sect_off));
11675 /* Ignore functions with missing or invalid low and high pc attributes. */
11676 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
11677 <= PC_BOUNDS_INVALID)
11679 attr = dwarf2_attr (die, DW_AT_external, cu);
11680 if (!attr || !DW_UNSND (attr))
11681 complaint (&symfile_complaints,
11682 _("cannot get low and high bounds "
11683 "for subprogram DIE at %d"),
11684 to_underlying (die->sect_off));
11688 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11689 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11691 /* If we have any template arguments, then we must allocate a
11692 different sort of symbol. */
11693 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
11695 if (child_die->tag == DW_TAG_template_type_param
11696 || child_die->tag == DW_TAG_template_value_param)
11698 templ_func = allocate_template_symbol (objfile);
11699 templ_func->base.is_cplus_template_function = 1;
11704 newobj = push_context (0, lowpc);
11705 newobj->name = new_symbol_full (die, read_type_die (die, cu), cu,
11706 (struct symbol *) templ_func);
11708 /* If there is a location expression for DW_AT_frame_base, record
11710 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
11712 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
11714 /* If there is a location for the static link, record it. */
11715 newobj->static_link = NULL;
11716 attr = dwarf2_attr (die, DW_AT_static_link, cu);
11719 newobj->static_link
11720 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
11721 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
11724 cu->list_in_scope = &local_symbols;
11726 if (die->child != NULL)
11728 child_die = die->child;
11729 while (child_die && child_die->tag)
11731 if (child_die->tag == DW_TAG_template_type_param
11732 || child_die->tag == DW_TAG_template_value_param)
11734 struct symbol *arg = new_symbol (child_die, NULL, cu);
11737 VEC_safe_push (symbolp, template_args, arg);
11740 process_die (child_die, cu);
11741 child_die = sibling_die (child_die);
11745 inherit_abstract_dies (die, cu);
11747 /* If we have a DW_AT_specification, we might need to import using
11748 directives from the context of the specification DIE. See the
11749 comment in determine_prefix. */
11750 if (cu->language == language_cplus
11751 && dwarf2_attr (die, DW_AT_specification, cu))
11753 struct dwarf2_cu *spec_cu = cu;
11754 struct die_info *spec_die = die_specification (die, &spec_cu);
11758 child_die = spec_die->child;
11759 while (child_die && child_die->tag)
11761 if (child_die->tag == DW_TAG_imported_module)
11762 process_die (child_die, spec_cu);
11763 child_die = sibling_die (child_die);
11766 /* In some cases, GCC generates specification DIEs that
11767 themselves contain DW_AT_specification attributes. */
11768 spec_die = die_specification (spec_die, &spec_cu);
11772 newobj = pop_context ();
11773 /* Make a block for the local symbols within. */
11774 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
11775 newobj->static_link, lowpc, highpc);
11777 /* For C++, set the block's scope. */
11778 if ((cu->language == language_cplus
11779 || cu->language == language_fortran
11780 || cu->language == language_d
11781 || cu->language == language_rust)
11782 && cu->processing_has_namespace_info)
11783 block_set_scope (block, determine_prefix (die, cu),
11784 &objfile->objfile_obstack);
11786 /* If we have address ranges, record them. */
11787 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11789 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
11791 /* Attach template arguments to function. */
11792 if (! VEC_empty (symbolp, template_args))
11794 gdb_assert (templ_func != NULL);
11796 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
11797 templ_func->template_arguments
11798 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
11799 templ_func->n_template_arguments);
11800 memcpy (templ_func->template_arguments,
11801 VEC_address (symbolp, template_args),
11802 (templ_func->n_template_arguments * sizeof (struct symbol *)));
11803 VEC_free (symbolp, template_args);
11806 /* In C++, we can have functions nested inside functions (e.g., when
11807 a function declares a class that has methods). This means that
11808 when we finish processing a function scope, we may need to go
11809 back to building a containing block's symbol lists. */
11810 local_symbols = newobj->locals;
11811 local_using_directives = newobj->local_using_directives;
11813 /* If we've finished processing a top-level function, subsequent
11814 symbols go in the file symbol list. */
11815 if (outermost_context_p ())
11816 cu->list_in_scope = &file_symbols;
11819 /* Process all the DIES contained within a lexical block scope. Start
11820 a new scope, process the dies, and then close the scope. */
11823 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
11825 struct objfile *objfile = cu->objfile;
11826 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11827 struct context_stack *newobj;
11828 CORE_ADDR lowpc, highpc;
11829 struct die_info *child_die;
11830 CORE_ADDR baseaddr;
11832 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11834 /* Ignore blocks with missing or invalid low and high pc attributes. */
11835 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
11836 as multiple lexical blocks? Handling children in a sane way would
11837 be nasty. Might be easier to properly extend generic blocks to
11838 describe ranges. */
11839 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
11841 case PC_BOUNDS_NOT_PRESENT:
11842 /* DW_TAG_lexical_block has no attributes, process its children as if
11843 there was no wrapping by that DW_TAG_lexical_block.
11844 GCC does no longer produces such DWARF since GCC r224161. */
11845 for (child_die = die->child;
11846 child_die != NULL && child_die->tag;
11847 child_die = sibling_die (child_die))
11848 process_die (child_die, cu);
11850 case PC_BOUNDS_INVALID:
11853 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11854 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
11856 push_context (0, lowpc);
11857 if (die->child != NULL)
11859 child_die = die->child;
11860 while (child_die && child_die->tag)
11862 process_die (child_die, cu);
11863 child_die = sibling_die (child_die);
11866 inherit_abstract_dies (die, cu);
11867 newobj = pop_context ();
11869 if (local_symbols != NULL || local_using_directives != NULL)
11871 struct block *block
11872 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
11873 newobj->start_addr, highpc);
11875 /* Note that recording ranges after traversing children, as we
11876 do here, means that recording a parent's ranges entails
11877 walking across all its children's ranges as they appear in
11878 the address map, which is quadratic behavior.
11880 It would be nicer to record the parent's ranges before
11881 traversing its children, simply overriding whatever you find
11882 there. But since we don't even decide whether to create a
11883 block until after we've traversed its children, that's hard
11885 dwarf2_record_block_ranges (die, block, baseaddr, cu);
11887 local_symbols = newobj->locals;
11888 local_using_directives = newobj->local_using_directives;
11891 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
11894 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
11896 struct objfile *objfile = cu->objfile;
11897 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11898 CORE_ADDR pc, baseaddr;
11899 struct attribute *attr;
11900 struct call_site *call_site, call_site_local;
11903 struct die_info *child_die;
11905 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11907 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
11910 /* This was a pre-DWARF-5 GNU extension alias
11911 for DW_AT_call_return_pc. */
11912 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
11916 complaint (&symfile_complaints,
11917 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
11918 "DIE 0x%x [in module %s]"),
11919 to_underlying (die->sect_off), objfile_name (objfile));
11922 pc = attr_value_as_address (attr) + baseaddr;
11923 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
11925 if (cu->call_site_htab == NULL)
11926 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
11927 NULL, &objfile->objfile_obstack,
11928 hashtab_obstack_allocate, NULL);
11929 call_site_local.pc = pc;
11930 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
11933 complaint (&symfile_complaints,
11934 _("Duplicate PC %s for DW_TAG_call_site "
11935 "DIE 0x%x [in module %s]"),
11936 paddress (gdbarch, pc), to_underlying (die->sect_off),
11937 objfile_name (objfile));
11941 /* Count parameters at the caller. */
11944 for (child_die = die->child; child_die && child_die->tag;
11945 child_die = sibling_die (child_die))
11947 if (child_die->tag != DW_TAG_call_site_parameter
11948 && child_die->tag != DW_TAG_GNU_call_site_parameter)
11950 complaint (&symfile_complaints,
11951 _("Tag %d is not DW_TAG_call_site_parameter in "
11952 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
11953 child_die->tag, to_underlying (child_die->sect_off),
11954 objfile_name (objfile));
11962 = ((struct call_site *)
11963 obstack_alloc (&objfile->objfile_obstack,
11964 sizeof (*call_site)
11965 + (sizeof (*call_site->parameter) * (nparams - 1))));
11967 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
11968 call_site->pc = pc;
11970 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
11971 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
11973 struct die_info *func_die;
11975 /* Skip also over DW_TAG_inlined_subroutine. */
11976 for (func_die = die->parent;
11977 func_die && func_die->tag != DW_TAG_subprogram
11978 && func_die->tag != DW_TAG_subroutine_type;
11979 func_die = func_die->parent);
11981 /* DW_AT_call_all_calls is a superset
11982 of DW_AT_call_all_tail_calls. */
11984 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
11985 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
11986 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
11987 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
11989 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
11990 not complete. But keep CALL_SITE for look ups via call_site_htab,
11991 both the initial caller containing the real return address PC and
11992 the final callee containing the current PC of a chain of tail
11993 calls do not need to have the tail call list complete. But any
11994 function candidate for a virtual tail call frame searched via
11995 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
11996 determined unambiguously. */
12000 struct type *func_type = NULL;
12003 func_type = get_die_type (func_die, cu);
12004 if (func_type != NULL)
12006 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
12008 /* Enlist this call site to the function. */
12009 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
12010 TYPE_TAIL_CALL_LIST (func_type) = call_site;
12013 complaint (&symfile_complaints,
12014 _("Cannot find function owning DW_TAG_call_site "
12015 "DIE 0x%x [in module %s]"),
12016 to_underlying (die->sect_off), objfile_name (objfile));
12020 attr = dwarf2_attr (die, DW_AT_call_target, cu);
12022 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
12024 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
12027 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
12028 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
12030 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
12031 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
12032 /* Keep NULL DWARF_BLOCK. */;
12033 else if (attr_form_is_block (attr))
12035 struct dwarf2_locexpr_baton *dlbaton;
12037 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
12038 dlbaton->data = DW_BLOCK (attr)->data;
12039 dlbaton->size = DW_BLOCK (attr)->size;
12040 dlbaton->per_cu = cu->per_cu;
12042 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
12044 else if (attr_form_is_ref (attr))
12046 struct dwarf2_cu *target_cu = cu;
12047 struct die_info *target_die;
12049 target_die = follow_die_ref (die, attr, &target_cu);
12050 gdb_assert (target_cu->objfile == objfile);
12051 if (die_is_declaration (target_die, target_cu))
12053 const char *target_physname;
12055 /* Prefer the mangled name; otherwise compute the demangled one. */
12056 target_physname = dwarf2_string_attr (target_die,
12057 DW_AT_linkage_name,
12059 if (target_physname == NULL)
12060 target_physname = dwarf2_string_attr (target_die,
12061 DW_AT_MIPS_linkage_name,
12063 if (target_physname == NULL)
12064 target_physname = dwarf2_physname (NULL, target_die, target_cu);
12065 if (target_physname == NULL)
12066 complaint (&symfile_complaints,
12067 _("DW_AT_call_target target DIE has invalid "
12068 "physname, for referencing DIE 0x%x [in module %s]"),
12069 to_underlying (die->sect_off), objfile_name (objfile));
12071 SET_FIELD_PHYSNAME (call_site->target, target_physname);
12077 /* DW_AT_entry_pc should be preferred. */
12078 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
12079 <= PC_BOUNDS_INVALID)
12080 complaint (&symfile_complaints,
12081 _("DW_AT_call_target target DIE has invalid "
12082 "low pc, for referencing DIE 0x%x [in module %s]"),
12083 to_underlying (die->sect_off), objfile_name (objfile));
12086 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
12087 SET_FIELD_PHYSADDR (call_site->target, lowpc);
12092 complaint (&symfile_complaints,
12093 _("DW_TAG_call_site DW_AT_call_target is neither "
12094 "block nor reference, for DIE 0x%x [in module %s]"),
12095 to_underlying (die->sect_off), objfile_name (objfile));
12097 call_site->per_cu = cu->per_cu;
12099 for (child_die = die->child;
12100 child_die && child_die->tag;
12101 child_die = sibling_die (child_die))
12103 struct call_site_parameter *parameter;
12104 struct attribute *loc, *origin;
12106 if (child_die->tag != DW_TAG_call_site_parameter
12107 && child_die->tag != DW_TAG_GNU_call_site_parameter)
12109 /* Already printed the complaint above. */
12113 gdb_assert (call_site->parameter_count < nparams);
12114 parameter = &call_site->parameter[call_site->parameter_count];
12116 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
12117 specifies DW_TAG_formal_parameter. Value of the data assumed for the
12118 register is contained in DW_AT_call_value. */
12120 loc = dwarf2_attr (child_die, DW_AT_location, cu);
12121 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
12122 if (origin == NULL)
12124 /* This was a pre-DWARF-5 GNU extension alias
12125 for DW_AT_call_parameter. */
12126 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
12128 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
12130 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
12132 sect_offset sect_off
12133 = (sect_offset) dwarf2_get_ref_die_offset (origin);
12134 if (!offset_in_cu_p (&cu->header, sect_off))
12136 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
12137 binding can be done only inside one CU. Such referenced DIE
12138 therefore cannot be even moved to DW_TAG_partial_unit. */
12139 complaint (&symfile_complaints,
12140 _("DW_AT_call_parameter offset is not in CU for "
12141 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12142 to_underlying (child_die->sect_off),
12143 objfile_name (objfile));
12146 parameter->u.param_cu_off
12147 = (cu_offset) (sect_off - cu->header.sect_off);
12149 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
12151 complaint (&symfile_complaints,
12152 _("No DW_FORM_block* DW_AT_location for "
12153 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12154 to_underlying (child_die->sect_off), objfile_name (objfile));
12159 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
12160 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
12161 if (parameter->u.dwarf_reg != -1)
12162 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
12163 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
12164 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
12165 ¶meter->u.fb_offset))
12166 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
12169 complaint (&symfile_complaints,
12170 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
12171 "for DW_FORM_block* DW_AT_location is supported for "
12172 "DW_TAG_call_site child DIE 0x%x "
12174 to_underlying (child_die->sect_off),
12175 objfile_name (objfile));
12180 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
12182 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
12183 if (!attr_form_is_block (attr))
12185 complaint (&symfile_complaints,
12186 _("No DW_FORM_block* DW_AT_call_value for "
12187 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12188 to_underlying (child_die->sect_off),
12189 objfile_name (objfile));
12192 parameter->value = DW_BLOCK (attr)->data;
12193 parameter->value_size = DW_BLOCK (attr)->size;
12195 /* Parameters are not pre-cleared by memset above. */
12196 parameter->data_value = NULL;
12197 parameter->data_value_size = 0;
12198 call_site->parameter_count++;
12200 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
12202 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
12205 if (!attr_form_is_block (attr))
12206 complaint (&symfile_complaints,
12207 _("No DW_FORM_block* DW_AT_call_data_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->data_value = DW_BLOCK (attr)->data;
12214 parameter->data_value_size = DW_BLOCK (attr)->size;
12220 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
12221 reading .debug_rnglists.
12222 Callback's type should be:
12223 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
12224 Return true if the attributes are present and valid, otherwise,
12227 template <typename Callback>
12229 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
12230 Callback &&callback)
12232 struct objfile *objfile = cu->objfile;
12233 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12234 struct comp_unit_head *cu_header = &cu->header;
12235 bfd *obfd = objfile->obfd;
12236 unsigned int addr_size = cu_header->addr_size;
12237 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12238 /* Base address selection entry. */
12241 unsigned int dummy;
12242 const gdb_byte *buffer;
12244 CORE_ADDR high = 0;
12245 CORE_ADDR baseaddr;
12246 bool overflow = false;
12248 found_base = cu->base_known;
12249 base = cu->base_address;
12251 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
12252 if (offset >= dwarf2_per_objfile->rnglists.size)
12254 complaint (&symfile_complaints,
12255 _("Offset %d out of bounds for DW_AT_ranges attribute"),
12259 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
12261 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12265 /* Initialize it due to a false compiler warning. */
12266 CORE_ADDR range_beginning = 0, range_end = 0;
12267 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
12268 + dwarf2_per_objfile->rnglists.size);
12269 unsigned int bytes_read;
12271 if (buffer == buf_end)
12276 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
12279 case DW_RLE_end_of_list:
12281 case DW_RLE_base_address:
12282 if (buffer + cu->header.addr_size > buf_end)
12287 base = read_address (obfd, buffer, cu, &bytes_read);
12289 buffer += bytes_read;
12291 case DW_RLE_start_length:
12292 if (buffer + cu->header.addr_size > buf_end)
12297 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12298 buffer += bytes_read;
12299 range_end = (range_beginning
12300 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
12301 buffer += bytes_read;
12302 if (buffer > buf_end)
12308 case DW_RLE_offset_pair:
12309 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12310 buffer += bytes_read;
12311 if (buffer > buf_end)
12316 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12317 buffer += bytes_read;
12318 if (buffer > buf_end)
12324 case DW_RLE_start_end:
12325 if (buffer + 2 * cu->header.addr_size > buf_end)
12330 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12331 buffer += bytes_read;
12332 range_end = read_address (obfd, buffer, cu, &bytes_read);
12333 buffer += bytes_read;
12336 complaint (&symfile_complaints,
12337 _("Invalid .debug_rnglists data (no base address)"));
12340 if (rlet == DW_RLE_end_of_list || overflow)
12342 if (rlet == DW_RLE_base_address)
12347 /* We have no valid base address for the ranges
12349 complaint (&symfile_complaints,
12350 _("Invalid .debug_rnglists data (no base address)"));
12354 if (range_beginning > range_end)
12356 /* Inverted range entries are invalid. */
12357 complaint (&symfile_complaints,
12358 _("Invalid .debug_rnglists data (inverted range)"));
12362 /* Empty range entries have no effect. */
12363 if (range_beginning == range_end)
12366 range_beginning += base;
12369 /* A not-uncommon case of bad debug info.
12370 Don't pollute the addrmap with bad data. */
12371 if (range_beginning + baseaddr == 0
12372 && !dwarf2_per_objfile->has_section_at_zero)
12374 complaint (&symfile_complaints,
12375 _(".debug_rnglists entry has start address of zero"
12376 " [in module %s]"), objfile_name (objfile));
12380 callback (range_beginning, range_end);
12385 complaint (&symfile_complaints,
12386 _("Offset %d is not terminated "
12387 "for DW_AT_ranges attribute"),
12395 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
12396 Callback's type should be:
12397 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
12398 Return 1 if the attributes are present and valid, otherwise, return 0. */
12400 template <typename Callback>
12402 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
12403 Callback &&callback)
12405 struct objfile *objfile = cu->objfile;
12406 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12407 struct comp_unit_head *cu_header = &cu->header;
12408 bfd *obfd = objfile->obfd;
12409 unsigned int addr_size = cu_header->addr_size;
12410 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12411 /* Base address selection entry. */
12414 unsigned int dummy;
12415 const gdb_byte *buffer;
12416 CORE_ADDR baseaddr;
12418 if (cu_header->version >= 5)
12419 return dwarf2_rnglists_process (offset, cu, callback);
12421 found_base = cu->base_known;
12422 base = cu->base_address;
12424 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
12425 if (offset >= dwarf2_per_objfile->ranges.size)
12427 complaint (&symfile_complaints,
12428 _("Offset %d out of bounds for DW_AT_ranges attribute"),
12432 buffer = dwarf2_per_objfile->ranges.buffer + offset;
12434 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12438 CORE_ADDR range_beginning, range_end;
12440 range_beginning = read_address (obfd, buffer, cu, &dummy);
12441 buffer += addr_size;
12442 range_end = read_address (obfd, buffer, cu, &dummy);
12443 buffer += addr_size;
12444 offset += 2 * addr_size;
12446 /* An end of list marker is a pair of zero addresses. */
12447 if (range_beginning == 0 && range_end == 0)
12448 /* Found the end of list entry. */
12451 /* Each base address selection entry is a pair of 2 values.
12452 The first is the largest possible address, the second is
12453 the base address. Check for a base address here. */
12454 if ((range_beginning & mask) == mask)
12456 /* If we found the largest possible address, then we already
12457 have the base address in range_end. */
12465 /* We have no valid base address for the ranges
12467 complaint (&symfile_complaints,
12468 _("Invalid .debug_ranges data (no base address)"));
12472 if (range_beginning > range_end)
12474 /* Inverted range entries are invalid. */
12475 complaint (&symfile_complaints,
12476 _("Invalid .debug_ranges data (inverted range)"));
12480 /* Empty range entries have no effect. */
12481 if (range_beginning == range_end)
12484 range_beginning += base;
12487 /* A not-uncommon case of bad debug info.
12488 Don't pollute the addrmap with bad data. */
12489 if (range_beginning + baseaddr == 0
12490 && !dwarf2_per_objfile->has_section_at_zero)
12492 complaint (&symfile_complaints,
12493 _(".debug_ranges entry has start address of zero"
12494 " [in module %s]"), objfile_name (objfile));
12498 callback (range_beginning, range_end);
12504 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
12505 Return 1 if the attributes are present and valid, otherwise, return 0.
12506 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
12509 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
12510 CORE_ADDR *high_return, struct dwarf2_cu *cu,
12511 struct partial_symtab *ranges_pst)
12513 struct objfile *objfile = cu->objfile;
12514 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12515 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
12516 SECT_OFF_TEXT (objfile));
12519 CORE_ADDR high = 0;
12522 retval = dwarf2_ranges_process (offset, cu,
12523 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
12525 if (ranges_pst != NULL)
12530 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12531 range_beginning + baseaddr);
12532 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
12533 range_end + baseaddr);
12534 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
12538 /* FIXME: This is recording everything as a low-high
12539 segment of consecutive addresses. We should have a
12540 data structure for discontiguous block ranges
12544 low = range_beginning;
12550 if (range_beginning < low)
12551 low = range_beginning;
12552 if (range_end > high)
12560 /* If the first entry is an end-of-list marker, the range
12561 describes an empty scope, i.e. no instructions. */
12567 *high_return = high;
12571 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
12572 definition for the return value. *LOWPC and *HIGHPC are set iff
12573 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
12575 static enum pc_bounds_kind
12576 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
12577 CORE_ADDR *highpc, struct dwarf2_cu *cu,
12578 struct partial_symtab *pst)
12580 struct attribute *attr;
12581 struct attribute *attr_high;
12583 CORE_ADDR high = 0;
12584 enum pc_bounds_kind ret;
12586 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12589 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12592 low = attr_value_as_address (attr);
12593 high = attr_value_as_address (attr_high);
12594 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12598 /* Found high w/o low attribute. */
12599 return PC_BOUNDS_INVALID;
12601 /* Found consecutive range of addresses. */
12602 ret = PC_BOUNDS_HIGH_LOW;
12606 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12609 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12610 We take advantage of the fact that DW_AT_ranges does not appear
12611 in DW_TAG_compile_unit of DWO files. */
12612 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12613 unsigned int ranges_offset = (DW_UNSND (attr)
12614 + (need_ranges_base
12618 /* Value of the DW_AT_ranges attribute is the offset in the
12619 .debug_ranges section. */
12620 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
12621 return PC_BOUNDS_INVALID;
12622 /* Found discontinuous range of addresses. */
12623 ret = PC_BOUNDS_RANGES;
12626 return PC_BOUNDS_NOT_PRESENT;
12629 /* read_partial_die has also the strict LOW < HIGH requirement. */
12631 return PC_BOUNDS_INVALID;
12633 /* When using the GNU linker, .gnu.linkonce. sections are used to
12634 eliminate duplicate copies of functions and vtables and such.
12635 The linker will arbitrarily choose one and discard the others.
12636 The AT_*_pc values for such functions refer to local labels in
12637 these sections. If the section from that file was discarded, the
12638 labels are not in the output, so the relocs get a value of 0.
12639 If this is a discarded function, mark the pc bounds as invalid,
12640 so that GDB will ignore it. */
12641 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
12642 return PC_BOUNDS_INVALID;
12650 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
12651 its low and high PC addresses. Do nothing if these addresses could not
12652 be determined. Otherwise, set LOWPC to the low address if it is smaller,
12653 and HIGHPC to the high address if greater than HIGHPC. */
12656 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
12657 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12658 struct dwarf2_cu *cu)
12660 CORE_ADDR low, high;
12661 struct die_info *child = die->child;
12663 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
12665 *lowpc = std::min (*lowpc, low);
12666 *highpc = std::max (*highpc, high);
12669 /* If the language does not allow nested subprograms (either inside
12670 subprograms or lexical blocks), we're done. */
12671 if (cu->language != language_ada)
12674 /* Check all the children of the given DIE. If it contains nested
12675 subprograms, then check their pc bounds. Likewise, we need to
12676 check lexical blocks as well, as they may also contain subprogram
12678 while (child && child->tag)
12680 if (child->tag == DW_TAG_subprogram
12681 || child->tag == DW_TAG_lexical_block)
12682 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
12683 child = sibling_die (child);
12687 /* Get the low and high pc's represented by the scope DIE, and store
12688 them in *LOWPC and *HIGHPC. If the correct values can't be
12689 determined, set *LOWPC to -1 and *HIGHPC to 0. */
12692 get_scope_pc_bounds (struct die_info *die,
12693 CORE_ADDR *lowpc, CORE_ADDR *highpc,
12694 struct dwarf2_cu *cu)
12696 CORE_ADDR best_low = (CORE_ADDR) -1;
12697 CORE_ADDR best_high = (CORE_ADDR) 0;
12698 CORE_ADDR current_low, current_high;
12700 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
12701 >= PC_BOUNDS_RANGES)
12703 best_low = current_low;
12704 best_high = current_high;
12708 struct die_info *child = die->child;
12710 while (child && child->tag)
12712 switch (child->tag) {
12713 case DW_TAG_subprogram:
12714 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
12716 case DW_TAG_namespace:
12717 case DW_TAG_module:
12718 /* FIXME: carlton/2004-01-16: Should we do this for
12719 DW_TAG_class_type/DW_TAG_structure_type, too? I think
12720 that current GCC's always emit the DIEs corresponding
12721 to definitions of methods of classes as children of a
12722 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
12723 the DIEs giving the declarations, which could be
12724 anywhere). But I don't see any reason why the
12725 standards says that they have to be there. */
12726 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
12728 if (current_low != ((CORE_ADDR) -1))
12730 best_low = std::min (best_low, current_low);
12731 best_high = std::max (best_high, current_high);
12739 child = sibling_die (child);
12744 *highpc = best_high;
12747 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
12751 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
12752 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
12754 struct objfile *objfile = cu->objfile;
12755 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12756 struct attribute *attr;
12757 struct attribute *attr_high;
12759 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
12762 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12765 CORE_ADDR low = attr_value_as_address (attr);
12766 CORE_ADDR high = attr_value_as_address (attr_high);
12768 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
12771 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
12772 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
12773 record_block_range (block, low, high - 1);
12777 attr = dwarf2_attr (die, DW_AT_ranges, cu);
12780 bfd *obfd = objfile->obfd;
12781 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
12782 We take advantage of the fact that DW_AT_ranges does not appear
12783 in DW_TAG_compile_unit of DWO files. */
12784 int need_ranges_base = die->tag != DW_TAG_compile_unit;
12786 /* The value of the DW_AT_ranges attribute is the offset of the
12787 address range list in the .debug_ranges section. */
12788 unsigned long offset = (DW_UNSND (attr)
12789 + (need_ranges_base ? cu->ranges_base : 0));
12790 const gdb_byte *buffer;
12792 /* For some target architectures, but not others, the
12793 read_address function sign-extends the addresses it returns.
12794 To recognize base address selection entries, we need a
12796 unsigned int addr_size = cu->header.addr_size;
12797 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12799 /* The base address, to which the next pair is relative. Note
12800 that this 'base' is a DWARF concept: most entries in a range
12801 list are relative, to reduce the number of relocs against the
12802 debugging information. This is separate from this function's
12803 'baseaddr' argument, which GDB uses to relocate debugging
12804 information from a shared library based on the address at
12805 which the library was loaded. */
12806 CORE_ADDR base = cu->base_address;
12807 int base_known = cu->base_known;
12809 dwarf2_ranges_process (offset, cu,
12810 [&] (CORE_ADDR start, CORE_ADDR end)
12814 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
12815 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
12816 record_block_range (block, start, end - 1);
12821 /* Check whether the producer field indicates either of GCC < 4.6, or the
12822 Intel C/C++ compiler, and cache the result in CU. */
12825 check_producer (struct dwarf2_cu *cu)
12829 if (cu->producer == NULL)
12831 /* For unknown compilers expect their behavior is DWARF version
12834 GCC started to support .debug_types sections by -gdwarf-4 since
12835 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
12836 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
12837 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
12838 interpreted incorrectly by GDB now - GCC PR debug/48229. */
12840 else if (producer_is_gcc (cu->producer, &major, &minor))
12842 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
12843 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
12845 else if (startswith (cu->producer, "Intel(R) C"))
12846 cu->producer_is_icc = 1;
12849 /* For other non-GCC compilers, expect their behavior is DWARF version
12853 cu->checked_producer = 1;
12856 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
12857 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
12858 during 4.6.0 experimental. */
12861 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
12863 if (!cu->checked_producer)
12864 check_producer (cu);
12866 return cu->producer_is_gxx_lt_4_6;
12869 /* Return the default accessibility type if it is not overriden by
12870 DW_AT_accessibility. */
12872 static enum dwarf_access_attribute
12873 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
12875 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
12877 /* The default DWARF 2 accessibility for members is public, the default
12878 accessibility for inheritance is private. */
12880 if (die->tag != DW_TAG_inheritance)
12881 return DW_ACCESS_public;
12883 return DW_ACCESS_private;
12887 /* DWARF 3+ defines the default accessibility a different way. The same
12888 rules apply now for DW_TAG_inheritance as for the members and it only
12889 depends on the container kind. */
12891 if (die->parent->tag == DW_TAG_class_type)
12892 return DW_ACCESS_private;
12894 return DW_ACCESS_public;
12898 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
12899 offset. If the attribute was not found return 0, otherwise return
12900 1. If it was found but could not properly be handled, set *OFFSET
12904 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
12907 struct attribute *attr;
12909 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
12914 /* Note that we do not check for a section offset first here.
12915 This is because DW_AT_data_member_location is new in DWARF 4,
12916 so if we see it, we can assume that a constant form is really
12917 a constant and not a section offset. */
12918 if (attr_form_is_constant (attr))
12919 *offset = dwarf2_get_attr_constant_value (attr, 0);
12920 else if (attr_form_is_section_offset (attr))
12921 dwarf2_complex_location_expr_complaint ();
12922 else if (attr_form_is_block (attr))
12923 *offset = decode_locdesc (DW_BLOCK (attr), cu);
12925 dwarf2_complex_location_expr_complaint ();
12933 /* Add an aggregate field to the field list. */
12936 dwarf2_add_field (struct field_info *fip, struct die_info *die,
12937 struct dwarf2_cu *cu)
12939 struct objfile *objfile = cu->objfile;
12940 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12941 struct nextfield *new_field;
12942 struct attribute *attr;
12944 const char *fieldname = "";
12946 /* Allocate a new field list entry and link it in. */
12947 new_field = XNEW (struct nextfield);
12948 make_cleanup (xfree, new_field);
12949 memset (new_field, 0, sizeof (struct nextfield));
12951 if (die->tag == DW_TAG_inheritance)
12953 new_field->next = fip->baseclasses;
12954 fip->baseclasses = new_field;
12958 new_field->next = fip->fields;
12959 fip->fields = new_field;
12963 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
12965 new_field->accessibility = DW_UNSND (attr);
12967 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
12968 if (new_field->accessibility != DW_ACCESS_public)
12969 fip->non_public_fields = 1;
12971 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
12973 new_field->virtuality = DW_UNSND (attr);
12975 new_field->virtuality = DW_VIRTUALITY_none;
12977 fp = &new_field->field;
12979 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
12983 /* Data member other than a C++ static data member. */
12985 /* Get type of field. */
12986 fp->type = die_type (die, cu);
12988 SET_FIELD_BITPOS (*fp, 0);
12990 /* Get bit size of field (zero if none). */
12991 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
12994 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
12998 FIELD_BITSIZE (*fp) = 0;
13001 /* Get bit offset of field. */
13002 if (handle_data_member_location (die, cu, &offset))
13003 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
13004 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
13007 if (gdbarch_bits_big_endian (gdbarch))
13009 /* For big endian bits, the DW_AT_bit_offset gives the
13010 additional bit offset from the MSB of the containing
13011 anonymous object to the MSB of the field. We don't
13012 have to do anything special since we don't need to
13013 know the size of the anonymous object. */
13014 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
13018 /* For little endian bits, compute the bit offset to the
13019 MSB of the anonymous object, subtract off the number of
13020 bits from the MSB of the field to the MSB of the
13021 object, and then subtract off the number of bits of
13022 the field itself. The result is the bit offset of
13023 the LSB of the field. */
13024 int anonymous_size;
13025 int bit_offset = DW_UNSND (attr);
13027 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13030 /* The size of the anonymous object containing
13031 the bit field is explicit, so use the
13032 indicated size (in bytes). */
13033 anonymous_size = DW_UNSND (attr);
13037 /* The size of the anonymous object containing
13038 the bit field must be inferred from the type
13039 attribute of the data member containing the
13041 anonymous_size = TYPE_LENGTH (fp->type);
13043 SET_FIELD_BITPOS (*fp,
13044 (FIELD_BITPOS (*fp)
13045 + anonymous_size * bits_per_byte
13046 - bit_offset - FIELD_BITSIZE (*fp)));
13049 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
13051 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
13052 + dwarf2_get_attr_constant_value (attr, 0)));
13054 /* Get name of field. */
13055 fieldname = dwarf2_name (die, cu);
13056 if (fieldname == NULL)
13059 /* The name is already allocated along with this objfile, so we don't
13060 need to duplicate it for the type. */
13061 fp->name = fieldname;
13063 /* Change accessibility for artificial fields (e.g. virtual table
13064 pointer or virtual base class pointer) to private. */
13065 if (dwarf2_attr (die, DW_AT_artificial, cu))
13067 FIELD_ARTIFICIAL (*fp) = 1;
13068 new_field->accessibility = DW_ACCESS_private;
13069 fip->non_public_fields = 1;
13072 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
13074 /* C++ static member. */
13076 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
13077 is a declaration, but all versions of G++ as of this writing
13078 (so through at least 3.2.1) incorrectly generate
13079 DW_TAG_variable tags. */
13081 const char *physname;
13083 /* Get name of field. */
13084 fieldname = dwarf2_name (die, cu);
13085 if (fieldname == NULL)
13088 attr = dwarf2_attr (die, DW_AT_const_value, cu);
13090 /* Only create a symbol if this is an external value.
13091 new_symbol checks this and puts the value in the global symbol
13092 table, which we want. If it is not external, new_symbol
13093 will try to put the value in cu->list_in_scope which is wrong. */
13094 && dwarf2_flag_true_p (die, DW_AT_external, cu))
13096 /* A static const member, not much different than an enum as far as
13097 we're concerned, except that we can support more types. */
13098 new_symbol (die, NULL, cu);
13101 /* Get physical name. */
13102 physname = dwarf2_physname (fieldname, die, cu);
13104 /* The name is already allocated along with this objfile, so we don't
13105 need to duplicate it for the type. */
13106 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
13107 FIELD_TYPE (*fp) = die_type (die, cu);
13108 FIELD_NAME (*fp) = fieldname;
13110 else if (die->tag == DW_TAG_inheritance)
13114 /* C++ base class field. */
13115 if (handle_data_member_location (die, cu, &offset))
13116 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
13117 FIELD_BITSIZE (*fp) = 0;
13118 FIELD_TYPE (*fp) = die_type (die, cu);
13119 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
13120 fip->nbaseclasses++;
13124 /* Add a typedef defined in the scope of the FIP's class. */
13127 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
13128 struct dwarf2_cu *cu)
13130 struct typedef_field_list *new_field;
13131 struct typedef_field *fp;
13133 /* Allocate a new field list entry and link it in. */
13134 new_field = XCNEW (struct typedef_field_list);
13135 make_cleanup (xfree, new_field);
13137 gdb_assert (die->tag == DW_TAG_typedef);
13139 fp = &new_field->field;
13141 /* Get name of field. */
13142 fp->name = dwarf2_name (die, cu);
13143 if (fp->name == NULL)
13146 fp->type = read_type_die (die, cu);
13148 new_field->next = fip->typedef_field_list;
13149 fip->typedef_field_list = new_field;
13150 fip->typedef_field_list_count++;
13153 /* Create the vector of fields, and attach it to the type. */
13156 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
13157 struct dwarf2_cu *cu)
13159 int nfields = fip->nfields;
13161 /* Record the field count, allocate space for the array of fields,
13162 and create blank accessibility bitfields if necessary. */
13163 TYPE_NFIELDS (type) = nfields;
13164 TYPE_FIELDS (type) = (struct field *)
13165 TYPE_ALLOC (type, sizeof (struct field) * nfields);
13166 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
13168 if (fip->non_public_fields && cu->language != language_ada)
13170 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13172 TYPE_FIELD_PRIVATE_BITS (type) =
13173 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13174 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
13176 TYPE_FIELD_PROTECTED_BITS (type) =
13177 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13178 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
13180 TYPE_FIELD_IGNORE_BITS (type) =
13181 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13182 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
13185 /* If the type has baseclasses, allocate and clear a bit vector for
13186 TYPE_FIELD_VIRTUAL_BITS. */
13187 if (fip->nbaseclasses && cu->language != language_ada)
13189 int num_bytes = B_BYTES (fip->nbaseclasses);
13190 unsigned char *pointer;
13192 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13193 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
13194 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
13195 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
13196 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
13199 /* Copy the saved-up fields into the field vector. Start from the head of
13200 the list, adding to the tail of the field array, so that they end up in
13201 the same order in the array in which they were added to the list. */
13202 while (nfields-- > 0)
13204 struct nextfield *fieldp;
13208 fieldp = fip->fields;
13209 fip->fields = fieldp->next;
13213 fieldp = fip->baseclasses;
13214 fip->baseclasses = fieldp->next;
13217 TYPE_FIELD (type, nfields) = fieldp->field;
13218 switch (fieldp->accessibility)
13220 case DW_ACCESS_private:
13221 if (cu->language != language_ada)
13222 SET_TYPE_FIELD_PRIVATE (type, nfields);
13225 case DW_ACCESS_protected:
13226 if (cu->language != language_ada)
13227 SET_TYPE_FIELD_PROTECTED (type, nfields);
13230 case DW_ACCESS_public:
13234 /* Unknown accessibility. Complain and treat it as public. */
13236 complaint (&symfile_complaints, _("unsupported accessibility %d"),
13237 fieldp->accessibility);
13241 if (nfields < fip->nbaseclasses)
13243 switch (fieldp->virtuality)
13245 case DW_VIRTUALITY_virtual:
13246 case DW_VIRTUALITY_pure_virtual:
13247 if (cu->language == language_ada)
13248 error (_("unexpected virtuality in component of Ada type"));
13249 SET_TYPE_FIELD_VIRTUAL (type, nfields);
13256 /* Return true if this member function is a constructor, false
13260 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
13262 const char *fieldname;
13263 const char *type_name;
13266 if (die->parent == NULL)
13269 if (die->parent->tag != DW_TAG_structure_type
13270 && die->parent->tag != DW_TAG_union_type
13271 && die->parent->tag != DW_TAG_class_type)
13274 fieldname = dwarf2_name (die, cu);
13275 type_name = dwarf2_name (die->parent, cu);
13276 if (fieldname == NULL || type_name == NULL)
13279 len = strlen (fieldname);
13280 return (strncmp (fieldname, type_name, len) == 0
13281 && (type_name[len] == '\0' || type_name[len] == '<'));
13284 /* Add a member function to the proper fieldlist. */
13287 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
13288 struct type *type, struct dwarf2_cu *cu)
13290 struct objfile *objfile = cu->objfile;
13291 struct attribute *attr;
13292 struct fnfieldlist *flp;
13294 struct fn_field *fnp;
13295 const char *fieldname;
13296 struct nextfnfield *new_fnfield;
13297 struct type *this_type;
13298 enum dwarf_access_attribute accessibility;
13300 if (cu->language == language_ada)
13301 error (_("unexpected member function in Ada type"));
13303 /* Get name of member function. */
13304 fieldname = dwarf2_name (die, cu);
13305 if (fieldname == NULL)
13308 /* Look up member function name in fieldlist. */
13309 for (i = 0; i < fip->nfnfields; i++)
13311 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
13315 /* Create new list element if necessary. */
13316 if (i < fip->nfnfields)
13317 flp = &fip->fnfieldlists[i];
13320 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
13322 fip->fnfieldlists = (struct fnfieldlist *)
13323 xrealloc (fip->fnfieldlists,
13324 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
13325 * sizeof (struct fnfieldlist));
13326 if (fip->nfnfields == 0)
13327 make_cleanup (free_current_contents, &fip->fnfieldlists);
13329 flp = &fip->fnfieldlists[fip->nfnfields];
13330 flp->name = fieldname;
13333 i = fip->nfnfields++;
13336 /* Create a new member function field and chain it to the field list
13338 new_fnfield = XNEW (struct nextfnfield);
13339 make_cleanup (xfree, new_fnfield);
13340 memset (new_fnfield, 0, sizeof (struct nextfnfield));
13341 new_fnfield->next = flp->head;
13342 flp->head = new_fnfield;
13345 /* Fill in the member function field info. */
13346 fnp = &new_fnfield->fnfield;
13348 /* Delay processing of the physname until later. */
13349 if (cu->language == language_cplus)
13351 add_to_method_list (type, i, flp->length - 1, fieldname,
13356 const char *physname = dwarf2_physname (fieldname, die, cu);
13357 fnp->physname = physname ? physname : "";
13360 fnp->type = alloc_type (objfile);
13361 this_type = read_type_die (die, cu);
13362 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
13364 int nparams = TYPE_NFIELDS (this_type);
13366 /* TYPE is the domain of this method, and THIS_TYPE is the type
13367 of the method itself (TYPE_CODE_METHOD). */
13368 smash_to_method_type (fnp->type, type,
13369 TYPE_TARGET_TYPE (this_type),
13370 TYPE_FIELDS (this_type),
13371 TYPE_NFIELDS (this_type),
13372 TYPE_VARARGS (this_type));
13374 /* Handle static member functions.
13375 Dwarf2 has no clean way to discern C++ static and non-static
13376 member functions. G++ helps GDB by marking the first
13377 parameter for non-static member functions (which is the this
13378 pointer) as artificial. We obtain this information from
13379 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
13380 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
13381 fnp->voffset = VOFFSET_STATIC;
13384 complaint (&symfile_complaints, _("member function type missing for '%s'"),
13385 dwarf2_full_name (fieldname, die, cu));
13387 /* Get fcontext from DW_AT_containing_type if present. */
13388 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13389 fnp->fcontext = die_containing_type (die, cu);
13391 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
13392 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
13394 /* Get accessibility. */
13395 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
13397 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
13399 accessibility = dwarf2_default_access_attribute (die, cu);
13400 switch (accessibility)
13402 case DW_ACCESS_private:
13403 fnp->is_private = 1;
13405 case DW_ACCESS_protected:
13406 fnp->is_protected = 1;
13410 /* Check for artificial methods. */
13411 attr = dwarf2_attr (die, DW_AT_artificial, cu);
13412 if (attr && DW_UNSND (attr) != 0)
13413 fnp->is_artificial = 1;
13415 fnp->is_constructor = dwarf2_is_constructor (die, cu);
13417 /* Get index in virtual function table if it is a virtual member
13418 function. For older versions of GCC, this is an offset in the
13419 appropriate virtual table, as specified by DW_AT_containing_type.
13420 For everyone else, it is an expression to be evaluated relative
13421 to the object address. */
13423 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
13426 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
13428 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
13430 /* Old-style GCC. */
13431 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
13433 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
13434 || (DW_BLOCK (attr)->size > 1
13435 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
13436 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
13438 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
13439 if ((fnp->voffset % cu->header.addr_size) != 0)
13440 dwarf2_complex_location_expr_complaint ();
13442 fnp->voffset /= cu->header.addr_size;
13446 dwarf2_complex_location_expr_complaint ();
13448 if (!fnp->fcontext)
13450 /* If there is no `this' field and no DW_AT_containing_type,
13451 we cannot actually find a base class context for the
13453 if (TYPE_NFIELDS (this_type) == 0
13454 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
13456 complaint (&symfile_complaints,
13457 _("cannot determine context for virtual member "
13458 "function \"%s\" (offset %d)"),
13459 fieldname, to_underlying (die->sect_off));
13464 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
13468 else if (attr_form_is_section_offset (attr))
13470 dwarf2_complex_location_expr_complaint ();
13474 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
13480 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
13481 if (attr && DW_UNSND (attr))
13483 /* GCC does this, as of 2008-08-25; PR debug/37237. */
13484 complaint (&symfile_complaints,
13485 _("Member function \"%s\" (offset %d) is virtual "
13486 "but the vtable offset is not specified"),
13487 fieldname, to_underlying (die->sect_off));
13488 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13489 TYPE_CPLUS_DYNAMIC (type) = 1;
13494 /* Create the vector of member function fields, and attach it to the type. */
13497 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
13498 struct dwarf2_cu *cu)
13500 struct fnfieldlist *flp;
13503 if (cu->language == language_ada)
13504 error (_("unexpected member functions in Ada type"));
13506 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13507 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
13508 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
13510 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
13512 struct nextfnfield *nfp = flp->head;
13513 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
13516 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
13517 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
13518 fn_flp->fn_fields = (struct fn_field *)
13519 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
13520 for (k = flp->length; (k--, nfp); nfp = nfp->next)
13521 fn_flp->fn_fields[k] = nfp->fnfield;
13524 TYPE_NFN_FIELDS (type) = fip->nfnfields;
13527 /* Returns non-zero if NAME is the name of a vtable member in CU's
13528 language, zero otherwise. */
13530 is_vtable_name (const char *name, struct dwarf2_cu *cu)
13532 static const char vptr[] = "_vptr";
13533 static const char vtable[] = "vtable";
13535 /* Look for the C++ form of the vtable. */
13536 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
13542 /* GCC outputs unnamed structures that are really pointers to member
13543 functions, with the ABI-specified layout. If TYPE describes
13544 such a structure, smash it into a member function type.
13546 GCC shouldn't do this; it should just output pointer to member DIEs.
13547 This is GCC PR debug/28767. */
13550 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
13552 struct type *pfn_type, *self_type, *new_type;
13554 /* Check for a structure with no name and two children. */
13555 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
13558 /* Check for __pfn and __delta members. */
13559 if (TYPE_FIELD_NAME (type, 0) == NULL
13560 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
13561 || TYPE_FIELD_NAME (type, 1) == NULL
13562 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
13565 /* Find the type of the method. */
13566 pfn_type = TYPE_FIELD_TYPE (type, 0);
13567 if (pfn_type == NULL
13568 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
13569 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
13572 /* Look for the "this" argument. */
13573 pfn_type = TYPE_TARGET_TYPE (pfn_type);
13574 if (TYPE_NFIELDS (pfn_type) == 0
13575 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
13576 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
13579 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
13580 new_type = alloc_type (objfile);
13581 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
13582 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
13583 TYPE_VARARGS (pfn_type));
13584 smash_to_methodptr_type (type, new_type);
13587 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
13591 producer_is_icc (struct dwarf2_cu *cu)
13593 if (!cu->checked_producer)
13594 check_producer (cu);
13596 return cu->producer_is_icc;
13599 /* Called when we find the DIE that starts a structure or union scope
13600 (definition) to create a type for the structure or union. Fill in
13601 the type's name and general properties; the members will not be
13602 processed until process_structure_scope. A symbol table entry for
13603 the type will also not be done until process_structure_scope (assuming
13604 the type has a name).
13606 NOTE: we need to call these functions regardless of whether or not the
13607 DIE has a DW_AT_name attribute, since it might be an anonymous
13608 structure or union. This gets the type entered into our set of
13609 user defined types. */
13611 static struct type *
13612 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
13614 struct objfile *objfile = cu->objfile;
13616 struct attribute *attr;
13619 /* If the definition of this type lives in .debug_types, read that type.
13620 Don't follow DW_AT_specification though, that will take us back up
13621 the chain and we want to go down. */
13622 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
13625 type = get_DW_AT_signature_type (die, attr, cu);
13627 /* The type's CU may not be the same as CU.
13628 Ensure TYPE is recorded with CU in die_type_hash. */
13629 return set_die_type (die, type, cu);
13632 type = alloc_type (objfile);
13633 INIT_CPLUS_SPECIFIC (type);
13635 name = dwarf2_name (die, cu);
13638 if (cu->language == language_cplus
13639 || cu->language == language_d
13640 || cu->language == language_rust)
13642 const char *full_name = dwarf2_full_name (name, die, cu);
13644 /* dwarf2_full_name might have already finished building the DIE's
13645 type. If so, there is no need to continue. */
13646 if (get_die_type (die, cu) != NULL)
13647 return get_die_type (die, cu);
13649 TYPE_TAG_NAME (type) = full_name;
13650 if (die->tag == DW_TAG_structure_type
13651 || die->tag == DW_TAG_class_type)
13652 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13656 /* The name is already allocated along with this objfile, so
13657 we don't need to duplicate it for the type. */
13658 TYPE_TAG_NAME (type) = name;
13659 if (die->tag == DW_TAG_class_type)
13660 TYPE_NAME (type) = TYPE_TAG_NAME (type);
13664 if (die->tag == DW_TAG_structure_type)
13666 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13668 else if (die->tag == DW_TAG_union_type)
13670 TYPE_CODE (type) = TYPE_CODE_UNION;
13674 TYPE_CODE (type) = TYPE_CODE_STRUCT;
13677 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
13678 TYPE_DECLARED_CLASS (type) = 1;
13680 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13683 if (attr_form_is_constant (attr))
13684 TYPE_LENGTH (type) = DW_UNSND (attr);
13687 /* For the moment, dynamic type sizes are not supported
13688 by GDB's struct type. The actual size is determined
13689 on-demand when resolving the type of a given object,
13690 so set the type's length to zero for now. Otherwise,
13691 we record an expression as the length, and that expression
13692 could lead to a very large value, which could eventually
13693 lead to us trying to allocate that much memory when creating
13694 a value of that type. */
13695 TYPE_LENGTH (type) = 0;
13700 TYPE_LENGTH (type) = 0;
13703 if (producer_is_icc (cu) && (TYPE_LENGTH (type) == 0))
13705 /* ICC does not output the required DW_AT_declaration
13706 on incomplete types, but gives them a size of zero. */
13707 TYPE_STUB (type) = 1;
13710 TYPE_STUB_SUPPORTED (type) = 1;
13712 if (die_is_declaration (die, cu))
13713 TYPE_STUB (type) = 1;
13714 else if (attr == NULL && die->child == NULL
13715 && producer_is_realview (cu->producer))
13716 /* RealView does not output the required DW_AT_declaration
13717 on incomplete types. */
13718 TYPE_STUB (type) = 1;
13720 /* We need to add the type field to the die immediately so we don't
13721 infinitely recurse when dealing with pointers to the structure
13722 type within the structure itself. */
13723 set_die_type (die, type, cu);
13725 /* set_die_type should be already done. */
13726 set_descriptive_type (type, die, cu);
13731 /* Finish creating a structure or union type, including filling in
13732 its members and creating a symbol for it. */
13735 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
13737 struct objfile *objfile = cu->objfile;
13738 struct die_info *child_die;
13741 type = get_die_type (die, cu);
13743 type = read_structure_type (die, cu);
13745 if (die->child != NULL && ! die_is_declaration (die, cu))
13747 struct field_info fi;
13748 VEC (symbolp) *template_args = NULL;
13749 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
13751 memset (&fi, 0, sizeof (struct field_info));
13753 child_die = die->child;
13755 while (child_die && child_die->tag)
13757 if (child_die->tag == DW_TAG_member
13758 || child_die->tag == DW_TAG_variable)
13760 /* NOTE: carlton/2002-11-05: A C++ static data member
13761 should be a DW_TAG_member that is a declaration, but
13762 all versions of G++ as of this writing (so through at
13763 least 3.2.1) incorrectly generate DW_TAG_variable
13764 tags for them instead. */
13765 dwarf2_add_field (&fi, child_die, cu);
13767 else if (child_die->tag == DW_TAG_subprogram)
13769 /* Rust doesn't have member functions in the C++ sense.
13770 However, it does emit ordinary functions as children
13771 of a struct DIE. */
13772 if (cu->language == language_rust)
13773 read_func_scope (child_die, cu);
13776 /* C++ member function. */
13777 dwarf2_add_member_fn (&fi, child_die, type, cu);
13780 else if (child_die->tag == DW_TAG_inheritance)
13782 /* C++ base class field. */
13783 dwarf2_add_field (&fi, child_die, cu);
13785 else if (child_die->tag == DW_TAG_typedef)
13786 dwarf2_add_typedef (&fi, child_die, cu);
13787 else if (child_die->tag == DW_TAG_template_type_param
13788 || child_die->tag == DW_TAG_template_value_param)
13790 struct symbol *arg = new_symbol (child_die, NULL, cu);
13793 VEC_safe_push (symbolp, template_args, arg);
13796 child_die = sibling_die (child_die);
13799 /* Attach template arguments to type. */
13800 if (! VEC_empty (symbolp, template_args))
13802 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13803 TYPE_N_TEMPLATE_ARGUMENTS (type)
13804 = VEC_length (symbolp, template_args);
13805 TYPE_TEMPLATE_ARGUMENTS (type)
13806 = XOBNEWVEC (&objfile->objfile_obstack,
13808 TYPE_N_TEMPLATE_ARGUMENTS (type));
13809 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
13810 VEC_address (symbolp, template_args),
13811 (TYPE_N_TEMPLATE_ARGUMENTS (type)
13812 * sizeof (struct symbol *)));
13813 VEC_free (symbolp, template_args);
13816 /* Attach fields and member functions to the type. */
13818 dwarf2_attach_fields_to_type (&fi, type, cu);
13821 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
13823 /* Get the type which refers to the base class (possibly this
13824 class itself) which contains the vtable pointer for the current
13825 class from the DW_AT_containing_type attribute. This use of
13826 DW_AT_containing_type is a GNU extension. */
13828 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
13830 struct type *t = die_containing_type (die, cu);
13832 set_type_vptr_basetype (type, t);
13837 /* Our own class provides vtbl ptr. */
13838 for (i = TYPE_NFIELDS (t) - 1;
13839 i >= TYPE_N_BASECLASSES (t);
13842 const char *fieldname = TYPE_FIELD_NAME (t, i);
13844 if (is_vtable_name (fieldname, cu))
13846 set_type_vptr_fieldno (type, i);
13851 /* Complain if virtual function table field not found. */
13852 if (i < TYPE_N_BASECLASSES (t))
13853 complaint (&symfile_complaints,
13854 _("virtual function table pointer "
13855 "not found when defining class '%s'"),
13856 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
13861 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
13864 else if (cu->producer
13865 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
13867 /* The IBM XLC compiler does not provide direct indication
13868 of the containing type, but the vtable pointer is
13869 always named __vfp. */
13873 for (i = TYPE_NFIELDS (type) - 1;
13874 i >= TYPE_N_BASECLASSES (type);
13877 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
13879 set_type_vptr_fieldno (type, i);
13880 set_type_vptr_basetype (type, type);
13887 /* Copy fi.typedef_field_list linked list elements content into the
13888 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
13889 if (fi.typedef_field_list)
13891 int i = fi.typedef_field_list_count;
13893 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13894 TYPE_TYPEDEF_FIELD_ARRAY (type)
13895 = ((struct typedef_field *)
13896 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
13897 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
13899 /* Reverse the list order to keep the debug info elements order. */
13902 struct typedef_field *dest, *src;
13904 dest = &TYPE_TYPEDEF_FIELD (type, i);
13905 src = &fi.typedef_field_list->field;
13906 fi.typedef_field_list = fi.typedef_field_list->next;
13911 do_cleanups (back_to);
13914 quirk_gcc_member_function_pointer (type, objfile);
13916 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
13917 snapshots) has been known to create a die giving a declaration
13918 for a class that has, as a child, a die giving a definition for a
13919 nested class. So we have to process our children even if the
13920 current die is a declaration. Normally, of course, a declaration
13921 won't have any children at all. */
13923 child_die = die->child;
13925 while (child_die != NULL && child_die->tag)
13927 if (child_die->tag == DW_TAG_member
13928 || child_die->tag == DW_TAG_variable
13929 || child_die->tag == DW_TAG_inheritance
13930 || child_die->tag == DW_TAG_template_value_param
13931 || child_die->tag == DW_TAG_template_type_param)
13936 process_die (child_die, cu);
13938 child_die = sibling_die (child_die);
13941 /* Do not consider external references. According to the DWARF standard,
13942 these DIEs are identified by the fact that they have no byte_size
13943 attribute, and a declaration attribute. */
13944 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
13945 || !die_is_declaration (die, cu))
13946 new_symbol (die, type, cu);
13949 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
13950 update TYPE using some information only available in DIE's children. */
13953 update_enumeration_type_from_children (struct die_info *die,
13955 struct dwarf2_cu *cu)
13957 struct die_info *child_die;
13958 int unsigned_enum = 1;
13962 auto_obstack obstack;
13964 for (child_die = die->child;
13965 child_die != NULL && child_die->tag;
13966 child_die = sibling_die (child_die))
13968 struct attribute *attr;
13970 const gdb_byte *bytes;
13971 struct dwarf2_locexpr_baton *baton;
13974 if (child_die->tag != DW_TAG_enumerator)
13977 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
13981 name = dwarf2_name (child_die, cu);
13983 name = "<anonymous enumerator>";
13985 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
13986 &value, &bytes, &baton);
13992 else if ((mask & value) != 0)
13997 /* If we already know that the enum type is neither unsigned, nor
13998 a flag type, no need to look at the rest of the enumerates. */
13999 if (!unsigned_enum && !flag_enum)
14004 TYPE_UNSIGNED (type) = 1;
14006 TYPE_FLAG_ENUM (type) = 1;
14009 /* Given a DW_AT_enumeration_type die, set its type. We do not
14010 complete the type's fields yet, or create any symbols. */
14012 static struct type *
14013 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
14015 struct objfile *objfile = cu->objfile;
14017 struct attribute *attr;
14020 /* If the definition of this type lives in .debug_types, read that type.
14021 Don't follow DW_AT_specification though, that will take us back up
14022 the chain and we want to go down. */
14023 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
14026 type = get_DW_AT_signature_type (die, attr, cu);
14028 /* The type's CU may not be the same as CU.
14029 Ensure TYPE is recorded with CU in die_type_hash. */
14030 return set_die_type (die, type, cu);
14033 type = alloc_type (objfile);
14035 TYPE_CODE (type) = TYPE_CODE_ENUM;
14036 name = dwarf2_full_name (NULL, die, cu);
14038 TYPE_TAG_NAME (type) = name;
14040 attr = dwarf2_attr (die, DW_AT_type, cu);
14043 struct type *underlying_type = die_type (die, cu);
14045 TYPE_TARGET_TYPE (type) = underlying_type;
14048 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14051 TYPE_LENGTH (type) = DW_UNSND (attr);
14055 TYPE_LENGTH (type) = 0;
14058 /* The enumeration DIE can be incomplete. In Ada, any type can be
14059 declared as private in the package spec, and then defined only
14060 inside the package body. Such types are known as Taft Amendment
14061 Types. When another package uses such a type, an incomplete DIE
14062 may be generated by the compiler. */
14063 if (die_is_declaration (die, cu))
14064 TYPE_STUB (type) = 1;
14066 /* Finish the creation of this type by using the enum's children.
14067 We must call this even when the underlying type has been provided
14068 so that we can determine if we're looking at a "flag" enum. */
14069 update_enumeration_type_from_children (die, type, cu);
14071 /* If this type has an underlying type that is not a stub, then we
14072 may use its attributes. We always use the "unsigned" attribute
14073 in this situation, because ordinarily we guess whether the type
14074 is unsigned -- but the guess can be wrong and the underlying type
14075 can tell us the reality. However, we defer to a local size
14076 attribute if one exists, because this lets the compiler override
14077 the underlying type if needed. */
14078 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
14080 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
14081 if (TYPE_LENGTH (type) == 0)
14082 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
14085 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
14087 return set_die_type (die, type, cu);
14090 /* Given a pointer to a die which begins an enumeration, process all
14091 the dies that define the members of the enumeration, and create the
14092 symbol for the enumeration type.
14094 NOTE: We reverse the order of the element list. */
14097 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
14099 struct type *this_type;
14101 this_type = get_die_type (die, cu);
14102 if (this_type == NULL)
14103 this_type = read_enumeration_type (die, cu);
14105 if (die->child != NULL)
14107 struct die_info *child_die;
14108 struct symbol *sym;
14109 struct field *fields = NULL;
14110 int num_fields = 0;
14113 child_die = die->child;
14114 while (child_die && child_die->tag)
14116 if (child_die->tag != DW_TAG_enumerator)
14118 process_die (child_die, cu);
14122 name = dwarf2_name (child_die, cu);
14125 sym = new_symbol (child_die, this_type, cu);
14127 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
14129 fields = (struct field *)
14131 (num_fields + DW_FIELD_ALLOC_CHUNK)
14132 * sizeof (struct field));
14135 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
14136 FIELD_TYPE (fields[num_fields]) = NULL;
14137 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
14138 FIELD_BITSIZE (fields[num_fields]) = 0;
14144 child_die = sibling_die (child_die);
14149 TYPE_NFIELDS (this_type) = num_fields;
14150 TYPE_FIELDS (this_type) = (struct field *)
14151 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
14152 memcpy (TYPE_FIELDS (this_type), fields,
14153 sizeof (struct field) * num_fields);
14158 /* If we are reading an enum from a .debug_types unit, and the enum
14159 is a declaration, and the enum is not the signatured type in the
14160 unit, then we do not want to add a symbol for it. Adding a
14161 symbol would in some cases obscure the true definition of the
14162 enum, giving users an incomplete type when the definition is
14163 actually available. Note that we do not want to do this for all
14164 enums which are just declarations, because C++0x allows forward
14165 enum declarations. */
14166 if (cu->per_cu->is_debug_types
14167 && die_is_declaration (die, cu))
14169 struct signatured_type *sig_type;
14171 sig_type = (struct signatured_type *) cu->per_cu;
14172 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
14173 if (sig_type->type_offset_in_section != die->sect_off)
14177 new_symbol (die, this_type, cu);
14180 /* Extract all information from a DW_TAG_array_type DIE and put it in
14181 the DIE's type field. For now, this only handles one dimensional
14184 static struct type *
14185 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
14187 struct objfile *objfile = cu->objfile;
14188 struct die_info *child_die;
14190 struct type *element_type, *range_type, *index_type;
14191 struct type **range_types = NULL;
14192 struct attribute *attr;
14194 struct cleanup *back_to;
14196 unsigned int bit_stride = 0;
14198 element_type = die_type (die, cu);
14200 /* The die_type call above may have already set the type for this DIE. */
14201 type = get_die_type (die, cu);
14205 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
14207 bit_stride = DW_UNSND (attr) * 8;
14209 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
14211 bit_stride = DW_UNSND (attr);
14213 /* Irix 6.2 native cc creates array types without children for
14214 arrays with unspecified length. */
14215 if (die->child == NULL)
14217 index_type = objfile_type (objfile)->builtin_int;
14218 range_type = create_static_range_type (NULL, index_type, 0, -1);
14219 type = create_array_type_with_stride (NULL, element_type, range_type,
14221 return set_die_type (die, type, cu);
14224 back_to = make_cleanup (null_cleanup, NULL);
14225 child_die = die->child;
14226 while (child_die && child_die->tag)
14228 if (child_die->tag == DW_TAG_subrange_type)
14230 struct type *child_type = read_type_die (child_die, cu);
14232 if (child_type != NULL)
14234 /* The range type was succesfully read. Save it for the
14235 array type creation. */
14236 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
14238 range_types = (struct type **)
14239 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
14240 * sizeof (struct type *));
14242 make_cleanup (free_current_contents, &range_types);
14244 range_types[ndim++] = child_type;
14247 child_die = sibling_die (child_die);
14250 /* Dwarf2 dimensions are output from left to right, create the
14251 necessary array types in backwards order. */
14253 type = element_type;
14255 if (read_array_order (die, cu) == DW_ORD_col_major)
14260 type = create_array_type_with_stride (NULL, type, range_types[i++],
14266 type = create_array_type_with_stride (NULL, type, range_types[ndim],
14270 /* Understand Dwarf2 support for vector types (like they occur on
14271 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
14272 array type. This is not part of the Dwarf2/3 standard yet, but a
14273 custom vendor extension. The main difference between a regular
14274 array and the vector variant is that vectors are passed by value
14276 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
14278 make_vector_type (type);
14280 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
14281 implementation may choose to implement triple vectors using this
14283 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14286 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
14287 TYPE_LENGTH (type) = DW_UNSND (attr);
14289 complaint (&symfile_complaints,
14290 _("DW_AT_byte_size for array type smaller "
14291 "than the total size of elements"));
14294 name = dwarf2_name (die, cu);
14296 TYPE_NAME (type) = name;
14298 /* Install the type in the die. */
14299 set_die_type (die, type, cu);
14301 /* set_die_type should be already done. */
14302 set_descriptive_type (type, die, cu);
14304 do_cleanups (back_to);
14309 static enum dwarf_array_dim_ordering
14310 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
14312 struct attribute *attr;
14314 attr = dwarf2_attr (die, DW_AT_ordering, cu);
14317 return (enum dwarf_array_dim_ordering) DW_SND (attr);
14319 /* GNU F77 is a special case, as at 08/2004 array type info is the
14320 opposite order to the dwarf2 specification, but data is still
14321 laid out as per normal fortran.
14323 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
14324 version checking. */
14326 if (cu->language == language_fortran
14327 && cu->producer && strstr (cu->producer, "GNU F77"))
14329 return DW_ORD_row_major;
14332 switch (cu->language_defn->la_array_ordering)
14334 case array_column_major:
14335 return DW_ORD_col_major;
14336 case array_row_major:
14338 return DW_ORD_row_major;
14342 /* Extract all information from a DW_TAG_set_type DIE and put it in
14343 the DIE's type field. */
14345 static struct type *
14346 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
14348 struct type *domain_type, *set_type;
14349 struct attribute *attr;
14351 domain_type = die_type (die, cu);
14353 /* The die_type call above may have already set the type for this DIE. */
14354 set_type = get_die_type (die, cu);
14358 set_type = create_set_type (NULL, domain_type);
14360 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14362 TYPE_LENGTH (set_type) = DW_UNSND (attr);
14364 return set_die_type (die, set_type, cu);
14367 /* A helper for read_common_block that creates a locexpr baton.
14368 SYM is the symbol which we are marking as computed.
14369 COMMON_DIE is the DIE for the common block.
14370 COMMON_LOC is the location expression attribute for the common
14372 MEMBER_LOC is the location expression attribute for the particular
14373 member of the common block that we are processing.
14374 CU is the CU from which the above come. */
14377 mark_common_block_symbol_computed (struct symbol *sym,
14378 struct die_info *common_die,
14379 struct attribute *common_loc,
14380 struct attribute *member_loc,
14381 struct dwarf2_cu *cu)
14383 struct objfile *objfile = dwarf2_per_objfile->objfile;
14384 struct dwarf2_locexpr_baton *baton;
14386 unsigned int cu_off;
14387 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
14388 LONGEST offset = 0;
14390 gdb_assert (common_loc && member_loc);
14391 gdb_assert (attr_form_is_block (common_loc));
14392 gdb_assert (attr_form_is_block (member_loc)
14393 || attr_form_is_constant (member_loc));
14395 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14396 baton->per_cu = cu->per_cu;
14397 gdb_assert (baton->per_cu);
14399 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
14401 if (attr_form_is_constant (member_loc))
14403 offset = dwarf2_get_attr_constant_value (member_loc, 0);
14404 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
14407 baton->size += DW_BLOCK (member_loc)->size;
14409 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
14412 *ptr++ = DW_OP_call4;
14413 cu_off = common_die->sect_off - cu->per_cu->sect_off;
14414 store_unsigned_integer (ptr, 4, byte_order, cu_off);
14417 if (attr_form_is_constant (member_loc))
14419 *ptr++ = DW_OP_addr;
14420 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
14421 ptr += cu->header.addr_size;
14425 /* We have to copy the data here, because DW_OP_call4 will only
14426 use a DW_AT_location attribute. */
14427 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
14428 ptr += DW_BLOCK (member_loc)->size;
14431 *ptr++ = DW_OP_plus;
14432 gdb_assert (ptr - baton->data == baton->size);
14434 SYMBOL_LOCATION_BATON (sym) = baton;
14435 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
14438 /* Create appropriate locally-scoped variables for all the
14439 DW_TAG_common_block entries. Also create a struct common_block
14440 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
14441 is used to sepate the common blocks name namespace from regular
14445 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
14447 struct attribute *attr;
14449 attr = dwarf2_attr (die, DW_AT_location, cu);
14452 /* Support the .debug_loc offsets. */
14453 if (attr_form_is_block (attr))
14457 else if (attr_form_is_section_offset (attr))
14459 dwarf2_complex_location_expr_complaint ();
14464 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14465 "common block member");
14470 if (die->child != NULL)
14472 struct objfile *objfile = cu->objfile;
14473 struct die_info *child_die;
14474 size_t n_entries = 0, size;
14475 struct common_block *common_block;
14476 struct symbol *sym;
14478 for (child_die = die->child;
14479 child_die && child_die->tag;
14480 child_die = sibling_die (child_die))
14483 size = (sizeof (struct common_block)
14484 + (n_entries - 1) * sizeof (struct symbol *));
14486 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
14488 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
14489 common_block->n_entries = 0;
14491 for (child_die = die->child;
14492 child_die && child_die->tag;
14493 child_die = sibling_die (child_die))
14495 /* Create the symbol in the DW_TAG_common_block block in the current
14497 sym = new_symbol (child_die, NULL, cu);
14500 struct attribute *member_loc;
14502 common_block->contents[common_block->n_entries++] = sym;
14504 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
14508 /* GDB has handled this for a long time, but it is
14509 not specified by DWARF. It seems to have been
14510 emitted by gfortran at least as recently as:
14511 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
14512 complaint (&symfile_complaints,
14513 _("Variable in common block has "
14514 "DW_AT_data_member_location "
14515 "- DIE at 0x%x [in module %s]"),
14516 to_underlying (child_die->sect_off),
14517 objfile_name (cu->objfile));
14519 if (attr_form_is_section_offset (member_loc))
14520 dwarf2_complex_location_expr_complaint ();
14521 else if (attr_form_is_constant (member_loc)
14522 || attr_form_is_block (member_loc))
14525 mark_common_block_symbol_computed (sym, die, attr,
14529 dwarf2_complex_location_expr_complaint ();
14534 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
14535 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
14539 /* Create a type for a C++ namespace. */
14541 static struct type *
14542 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
14544 struct objfile *objfile = cu->objfile;
14545 const char *previous_prefix, *name;
14549 /* For extensions, reuse the type of the original namespace. */
14550 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
14552 struct die_info *ext_die;
14553 struct dwarf2_cu *ext_cu = cu;
14555 ext_die = dwarf2_extension (die, &ext_cu);
14556 type = read_type_die (ext_die, ext_cu);
14558 /* EXT_CU may not be the same as CU.
14559 Ensure TYPE is recorded with CU in die_type_hash. */
14560 return set_die_type (die, type, cu);
14563 name = namespace_name (die, &is_anonymous, cu);
14565 /* Now build the name of the current namespace. */
14567 previous_prefix = determine_prefix (die, cu);
14568 if (previous_prefix[0] != '\0')
14569 name = typename_concat (&objfile->objfile_obstack,
14570 previous_prefix, name, 0, cu);
14572 /* Create the type. */
14573 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
14574 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14576 return set_die_type (die, type, cu);
14579 /* Read a namespace scope. */
14582 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
14584 struct objfile *objfile = cu->objfile;
14587 /* Add a symbol associated to this if we haven't seen the namespace
14588 before. Also, add a using directive if it's an anonymous
14591 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
14595 type = read_type_die (die, cu);
14596 new_symbol (die, type, cu);
14598 namespace_name (die, &is_anonymous, cu);
14601 const char *previous_prefix = determine_prefix (die, cu);
14603 add_using_directive (using_directives (cu->language),
14604 previous_prefix, TYPE_NAME (type), NULL,
14605 NULL, NULL, 0, &objfile->objfile_obstack);
14609 if (die->child != NULL)
14611 struct die_info *child_die = die->child;
14613 while (child_die && child_die->tag)
14615 process_die (child_die, cu);
14616 child_die = sibling_die (child_die);
14621 /* Read a Fortran module as type. This DIE can be only a declaration used for
14622 imported module. Still we need that type as local Fortran "use ... only"
14623 declaration imports depend on the created type in determine_prefix. */
14625 static struct type *
14626 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
14628 struct objfile *objfile = cu->objfile;
14629 const char *module_name;
14632 module_name = dwarf2_name (die, cu);
14634 complaint (&symfile_complaints,
14635 _("DW_TAG_module has no name, offset 0x%x"),
14636 to_underlying (die->sect_off));
14637 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
14639 /* determine_prefix uses TYPE_TAG_NAME. */
14640 TYPE_TAG_NAME (type) = TYPE_NAME (type);
14642 return set_die_type (die, type, cu);
14645 /* Read a Fortran module. */
14648 read_module (struct die_info *die, struct dwarf2_cu *cu)
14650 struct die_info *child_die = die->child;
14653 type = read_type_die (die, cu);
14654 new_symbol (die, type, cu);
14656 while (child_die && child_die->tag)
14658 process_die (child_die, cu);
14659 child_die = sibling_die (child_die);
14663 /* Return the name of the namespace represented by DIE. Set
14664 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
14667 static const char *
14668 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
14670 struct die_info *current_die;
14671 const char *name = NULL;
14673 /* Loop through the extensions until we find a name. */
14675 for (current_die = die;
14676 current_die != NULL;
14677 current_die = dwarf2_extension (die, &cu))
14679 /* We don't use dwarf2_name here so that we can detect the absence
14680 of a name -> anonymous namespace. */
14681 name = dwarf2_string_attr (die, DW_AT_name, cu);
14687 /* Is it an anonymous namespace? */
14689 *is_anonymous = (name == NULL);
14691 name = CP_ANONYMOUS_NAMESPACE_STR;
14696 /* Extract all information from a DW_TAG_pointer_type DIE and add to
14697 the user defined type vector. */
14699 static struct type *
14700 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
14702 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
14703 struct comp_unit_head *cu_header = &cu->header;
14705 struct attribute *attr_byte_size;
14706 struct attribute *attr_address_class;
14707 int byte_size, addr_class;
14708 struct type *target_type;
14710 target_type = die_type (die, cu);
14712 /* The die_type call above may have already set the type for this DIE. */
14713 type = get_die_type (die, cu);
14717 type = lookup_pointer_type (target_type);
14719 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
14720 if (attr_byte_size)
14721 byte_size = DW_UNSND (attr_byte_size);
14723 byte_size = cu_header->addr_size;
14725 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
14726 if (attr_address_class)
14727 addr_class = DW_UNSND (attr_address_class);
14729 addr_class = DW_ADDR_none;
14731 /* If the pointer size or address class is different than the
14732 default, create a type variant marked as such and set the
14733 length accordingly. */
14734 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
14736 if (gdbarch_address_class_type_flags_p (gdbarch))
14740 type_flags = gdbarch_address_class_type_flags
14741 (gdbarch, byte_size, addr_class);
14742 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
14744 type = make_type_with_address_space (type, type_flags);
14746 else if (TYPE_LENGTH (type) != byte_size)
14748 complaint (&symfile_complaints,
14749 _("invalid pointer size %d"), byte_size);
14753 /* Should we also complain about unhandled address classes? */
14757 TYPE_LENGTH (type) = byte_size;
14758 return set_die_type (die, type, cu);
14761 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
14762 the user defined type vector. */
14764 static struct type *
14765 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
14768 struct type *to_type;
14769 struct type *domain;
14771 to_type = die_type (die, cu);
14772 domain = die_containing_type (die, cu);
14774 /* The calls above may have already set the type for this DIE. */
14775 type = get_die_type (die, cu);
14779 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
14780 type = lookup_methodptr_type (to_type);
14781 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
14783 struct type *new_type = alloc_type (cu->objfile);
14785 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
14786 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
14787 TYPE_VARARGS (to_type));
14788 type = lookup_methodptr_type (new_type);
14791 type = lookup_memberptr_type (to_type, domain);
14793 return set_die_type (die, type, cu);
14796 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
14797 the user defined type vector. */
14799 static struct type *
14800 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
14801 enum type_code refcode)
14803 struct comp_unit_head *cu_header = &cu->header;
14804 struct type *type, *target_type;
14805 struct attribute *attr;
14807 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
14809 target_type = die_type (die, cu);
14811 /* The die_type call above may have already set the type for this DIE. */
14812 type = get_die_type (die, cu);
14816 type = lookup_reference_type (target_type, refcode);
14817 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14820 TYPE_LENGTH (type) = DW_UNSND (attr);
14824 TYPE_LENGTH (type) = cu_header->addr_size;
14826 return set_die_type (die, type, cu);
14829 /* Add the given cv-qualifiers to the element type of the array. GCC
14830 outputs DWARF type qualifiers that apply to an array, not the
14831 element type. But GDB relies on the array element type to carry
14832 the cv-qualifiers. This mimics section 6.7.3 of the C99
14835 static struct type *
14836 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
14837 struct type *base_type, int cnst, int voltl)
14839 struct type *el_type, *inner_array;
14841 base_type = copy_type (base_type);
14842 inner_array = base_type;
14844 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
14846 TYPE_TARGET_TYPE (inner_array) =
14847 copy_type (TYPE_TARGET_TYPE (inner_array));
14848 inner_array = TYPE_TARGET_TYPE (inner_array);
14851 el_type = TYPE_TARGET_TYPE (inner_array);
14852 cnst |= TYPE_CONST (el_type);
14853 voltl |= TYPE_VOLATILE (el_type);
14854 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
14856 return set_die_type (die, base_type, cu);
14859 static struct type *
14860 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
14862 struct type *base_type, *cv_type;
14864 base_type = die_type (die, cu);
14866 /* The die_type call above may have already set the type for this DIE. */
14867 cv_type = get_die_type (die, cu);
14871 /* In case the const qualifier is applied to an array type, the element type
14872 is so qualified, not the array type (section 6.7.3 of C99). */
14873 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14874 return add_array_cv_type (die, cu, base_type, 1, 0);
14876 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
14877 return set_die_type (die, cv_type, cu);
14880 static struct type *
14881 read_tag_volatile_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 volatile qualifier is applied to an array type, the
14893 element type is so qualified, not the array type (section 6.7.3
14895 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
14896 return add_array_cv_type (die, cu, base_type, 0, 1);
14898 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
14899 return set_die_type (die, cv_type, cu);
14902 /* Handle DW_TAG_restrict_type. */
14904 static struct type *
14905 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
14907 struct type *base_type, *cv_type;
14909 base_type = die_type (die, cu);
14911 /* The die_type call above may have already set the type for this DIE. */
14912 cv_type = get_die_type (die, cu);
14916 cv_type = make_restrict_type (base_type);
14917 return set_die_type (die, cv_type, cu);
14920 /* Handle DW_TAG_atomic_type. */
14922 static struct type *
14923 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
14925 struct type *base_type, *cv_type;
14927 base_type = die_type (die, cu);
14929 /* The die_type call above may have already set the type for this DIE. */
14930 cv_type = get_die_type (die, cu);
14934 cv_type = make_atomic_type (base_type);
14935 return set_die_type (die, cv_type, cu);
14938 /* Extract all information from a DW_TAG_string_type DIE and add to
14939 the user defined type vector. It isn't really a user defined type,
14940 but it behaves like one, with other DIE's using an AT_user_def_type
14941 attribute to reference it. */
14943 static struct type *
14944 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
14946 struct objfile *objfile = cu->objfile;
14947 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14948 struct type *type, *range_type, *index_type, *char_type;
14949 struct attribute *attr;
14950 unsigned int length;
14952 attr = dwarf2_attr (die, DW_AT_string_length, cu);
14955 length = DW_UNSND (attr);
14959 /* Check for the DW_AT_byte_size attribute. */
14960 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14963 length = DW_UNSND (attr);
14971 index_type = objfile_type (objfile)->builtin_int;
14972 range_type = create_static_range_type (NULL, index_type, 1, length);
14973 char_type = language_string_char_type (cu->language_defn, gdbarch);
14974 type = create_string_type (NULL, char_type, range_type);
14976 return set_die_type (die, type, cu);
14979 /* Assuming that DIE corresponds to a function, returns nonzero
14980 if the function is prototyped. */
14983 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
14985 struct attribute *attr;
14987 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
14988 if (attr && (DW_UNSND (attr) != 0))
14991 /* The DWARF standard implies that the DW_AT_prototyped attribute
14992 is only meaninful for C, but the concept also extends to other
14993 languages that allow unprototyped functions (Eg: Objective C).
14994 For all other languages, assume that functions are always
14996 if (cu->language != language_c
14997 && cu->language != language_objc
14998 && cu->language != language_opencl)
15001 /* RealView does not emit DW_AT_prototyped. We can not distinguish
15002 prototyped and unprototyped functions; default to prototyped,
15003 since that is more common in modern code (and RealView warns
15004 about unprototyped functions). */
15005 if (producer_is_realview (cu->producer))
15011 /* Handle DIES due to C code like:
15015 int (*funcp)(int a, long l);
15019 ('funcp' generates a DW_TAG_subroutine_type DIE). */
15021 static struct type *
15022 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
15024 struct objfile *objfile = cu->objfile;
15025 struct type *type; /* Type that this function returns. */
15026 struct type *ftype; /* Function that returns above type. */
15027 struct attribute *attr;
15029 type = die_type (die, cu);
15031 /* The die_type call above may have already set the type for this DIE. */
15032 ftype = get_die_type (die, cu);
15036 ftype = lookup_function_type (type);
15038 if (prototyped_function_p (die, cu))
15039 TYPE_PROTOTYPED (ftype) = 1;
15041 /* Store the calling convention in the type if it's available in
15042 the subroutine die. Otherwise set the calling convention to
15043 the default value DW_CC_normal. */
15044 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
15046 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
15047 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
15048 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
15050 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
15052 /* Record whether the function returns normally to its caller or not
15053 if the DWARF producer set that information. */
15054 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
15055 if (attr && (DW_UNSND (attr) != 0))
15056 TYPE_NO_RETURN (ftype) = 1;
15058 /* We need to add the subroutine type to the die immediately so
15059 we don't infinitely recurse when dealing with parameters
15060 declared as the same subroutine type. */
15061 set_die_type (die, ftype, cu);
15063 if (die->child != NULL)
15065 struct type *void_type = objfile_type (objfile)->builtin_void;
15066 struct die_info *child_die;
15067 int nparams, iparams;
15069 /* Count the number of parameters.
15070 FIXME: GDB currently ignores vararg functions, but knows about
15071 vararg member functions. */
15073 child_die = die->child;
15074 while (child_die && child_die->tag)
15076 if (child_die->tag == DW_TAG_formal_parameter)
15078 else if (child_die->tag == DW_TAG_unspecified_parameters)
15079 TYPE_VARARGS (ftype) = 1;
15080 child_die = sibling_die (child_die);
15083 /* Allocate storage for parameters and fill them in. */
15084 TYPE_NFIELDS (ftype) = nparams;
15085 TYPE_FIELDS (ftype) = (struct field *)
15086 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
15088 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
15089 even if we error out during the parameters reading below. */
15090 for (iparams = 0; iparams < nparams; iparams++)
15091 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
15094 child_die = die->child;
15095 while (child_die && child_die->tag)
15097 if (child_die->tag == DW_TAG_formal_parameter)
15099 struct type *arg_type;
15101 /* DWARF version 2 has no clean way to discern C++
15102 static and non-static member functions. G++ helps
15103 GDB by marking the first parameter for non-static
15104 member functions (which is the this pointer) as
15105 artificial. We pass this information to
15106 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
15108 DWARF version 3 added DW_AT_object_pointer, which GCC
15109 4.5 does not yet generate. */
15110 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
15112 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
15114 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
15115 arg_type = die_type (child_die, cu);
15117 /* RealView does not mark THIS as const, which the testsuite
15118 expects. GCC marks THIS as const in method definitions,
15119 but not in the class specifications (GCC PR 43053). */
15120 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
15121 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
15124 struct dwarf2_cu *arg_cu = cu;
15125 const char *name = dwarf2_name (child_die, cu);
15127 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
15130 /* If the compiler emits this, use it. */
15131 if (follow_die_ref (die, attr, &arg_cu) == child_die)
15134 else if (name && strcmp (name, "this") == 0)
15135 /* Function definitions will have the argument names. */
15137 else if (name == NULL && iparams == 0)
15138 /* Declarations may not have the names, so like
15139 elsewhere in GDB, assume an artificial first
15140 argument is "this". */
15144 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
15148 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
15151 child_die = sibling_die (child_die);
15158 static struct type *
15159 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
15161 struct objfile *objfile = cu->objfile;
15162 const char *name = NULL;
15163 struct type *this_type, *target_type;
15165 name = dwarf2_full_name (NULL, die, cu);
15166 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
15167 TYPE_TARGET_STUB (this_type) = 1;
15168 set_die_type (die, this_type, cu);
15169 target_type = die_type (die, cu);
15170 if (target_type != this_type)
15171 TYPE_TARGET_TYPE (this_type) = target_type;
15174 /* Self-referential typedefs are, it seems, not allowed by the DWARF
15175 spec and cause infinite loops in GDB. */
15176 complaint (&symfile_complaints,
15177 _("Self-referential DW_TAG_typedef "
15178 "- DIE at 0x%x [in module %s]"),
15179 to_underlying (die->sect_off), objfile_name (objfile));
15180 TYPE_TARGET_TYPE (this_type) = NULL;
15185 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
15186 (which may be different from NAME) to the architecture back-end to allow
15187 it to guess the correct format if necessary. */
15189 static struct type *
15190 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
15191 const char *name_hint)
15193 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15194 const struct floatformat **format;
15197 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
15199 type = init_float_type (objfile, bits, name, format);
15201 type = init_type (objfile, TYPE_CODE_ERROR, bits / TARGET_CHAR_BIT, name);
15206 /* Find a representation of a given base type and install
15207 it in the TYPE field of the die. */
15209 static struct type *
15210 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
15212 struct objfile *objfile = cu->objfile;
15214 struct attribute *attr;
15215 int encoding = 0, bits = 0;
15218 attr = dwarf2_attr (die, DW_AT_encoding, cu);
15221 encoding = DW_UNSND (attr);
15223 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15226 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
15228 name = dwarf2_name (die, cu);
15231 complaint (&symfile_complaints,
15232 _("DW_AT_name missing from DW_TAG_base_type"));
15237 case DW_ATE_address:
15238 /* Turn DW_ATE_address into a void * pointer. */
15239 type = init_type (objfile, TYPE_CODE_VOID, 1, NULL);
15240 type = init_pointer_type (objfile, bits, name, type);
15242 case DW_ATE_boolean:
15243 type = init_boolean_type (objfile, bits, 1, name);
15245 case DW_ATE_complex_float:
15246 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
15247 type = init_complex_type (objfile, name, type);
15249 case DW_ATE_decimal_float:
15250 type = init_decfloat_type (objfile, bits, name);
15253 type = dwarf2_init_float_type (objfile, bits, name, name);
15255 case DW_ATE_signed:
15256 type = init_integer_type (objfile, bits, 0, name);
15258 case DW_ATE_unsigned:
15259 if (cu->language == language_fortran
15261 && startswith (name, "character("))
15262 type = init_character_type (objfile, bits, 1, name);
15264 type = init_integer_type (objfile, bits, 1, name);
15266 case DW_ATE_signed_char:
15267 if (cu->language == language_ada || cu->language == language_m2
15268 || cu->language == language_pascal
15269 || cu->language == language_fortran)
15270 type = init_character_type (objfile, bits, 0, name);
15272 type = init_integer_type (objfile, bits, 0, name);
15274 case DW_ATE_unsigned_char:
15275 if (cu->language == language_ada || cu->language == language_m2
15276 || cu->language == language_pascal
15277 || cu->language == language_fortran
15278 || cu->language == language_rust)
15279 type = init_character_type (objfile, bits, 1, name);
15281 type = init_integer_type (objfile, bits, 1, name);
15285 gdbarch *arch = get_objfile_arch (objfile);
15288 type = builtin_type (arch)->builtin_char16;
15289 else if (bits == 32)
15290 type = builtin_type (arch)->builtin_char32;
15293 complaint (&symfile_complaints,
15294 _("unsupported DW_ATE_UTF bit size: '%d'"),
15296 type = init_integer_type (objfile, bits, 1, name);
15298 return set_die_type (die, type, cu);
15303 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
15304 dwarf_type_encoding_name (encoding));
15305 type = init_type (objfile, TYPE_CODE_ERROR,
15306 bits / TARGET_CHAR_BIT, name);
15310 if (name && strcmp (name, "char") == 0)
15311 TYPE_NOSIGN (type) = 1;
15313 return set_die_type (die, type, cu);
15316 /* Parse dwarf attribute if it's a block, reference or constant and put the
15317 resulting value of the attribute into struct bound_prop.
15318 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
15321 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
15322 struct dwarf2_cu *cu, struct dynamic_prop *prop)
15324 struct dwarf2_property_baton *baton;
15325 struct obstack *obstack = &cu->objfile->objfile_obstack;
15327 if (attr == NULL || prop == NULL)
15330 if (attr_form_is_block (attr))
15332 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15333 baton->referenced_type = NULL;
15334 baton->locexpr.per_cu = cu->per_cu;
15335 baton->locexpr.size = DW_BLOCK (attr)->size;
15336 baton->locexpr.data = DW_BLOCK (attr)->data;
15337 prop->data.baton = baton;
15338 prop->kind = PROP_LOCEXPR;
15339 gdb_assert (prop->data.baton != NULL);
15341 else if (attr_form_is_ref (attr))
15343 struct dwarf2_cu *target_cu = cu;
15344 struct die_info *target_die;
15345 struct attribute *target_attr;
15347 target_die = follow_die_ref (die, attr, &target_cu);
15348 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
15349 if (target_attr == NULL)
15350 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
15352 if (target_attr == NULL)
15355 switch (target_attr->name)
15357 case DW_AT_location:
15358 if (attr_form_is_section_offset (target_attr))
15360 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15361 baton->referenced_type = die_type (target_die, target_cu);
15362 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
15363 prop->data.baton = baton;
15364 prop->kind = PROP_LOCLIST;
15365 gdb_assert (prop->data.baton != NULL);
15367 else if (attr_form_is_block (target_attr))
15369 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15370 baton->referenced_type = die_type (target_die, target_cu);
15371 baton->locexpr.per_cu = cu->per_cu;
15372 baton->locexpr.size = DW_BLOCK (target_attr)->size;
15373 baton->locexpr.data = DW_BLOCK (target_attr)->data;
15374 prop->data.baton = baton;
15375 prop->kind = PROP_LOCEXPR;
15376 gdb_assert (prop->data.baton != NULL);
15380 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15381 "dynamic property");
15385 case DW_AT_data_member_location:
15389 if (!handle_data_member_location (target_die, target_cu,
15393 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15394 baton->referenced_type = read_type_die (target_die->parent,
15396 baton->offset_info.offset = offset;
15397 baton->offset_info.type = die_type (target_die, target_cu);
15398 prop->data.baton = baton;
15399 prop->kind = PROP_ADDR_OFFSET;
15404 else if (attr_form_is_constant (attr))
15406 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
15407 prop->kind = PROP_CONST;
15411 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
15412 dwarf2_name (die, cu));
15419 /* Read the given DW_AT_subrange DIE. */
15421 static struct type *
15422 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
15424 struct type *base_type, *orig_base_type;
15425 struct type *range_type;
15426 struct attribute *attr;
15427 struct dynamic_prop low, high;
15428 int low_default_is_valid;
15429 int high_bound_is_count = 0;
15431 LONGEST negative_mask;
15433 orig_base_type = die_type (die, cu);
15434 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
15435 whereas the real type might be. So, we use ORIG_BASE_TYPE when
15436 creating the range type, but we use the result of check_typedef
15437 when examining properties of the type. */
15438 base_type = check_typedef (orig_base_type);
15440 /* The die_type call above may have already set the type for this DIE. */
15441 range_type = get_die_type (die, cu);
15445 low.kind = PROP_CONST;
15446 high.kind = PROP_CONST;
15447 high.data.const_val = 0;
15449 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
15450 omitting DW_AT_lower_bound. */
15451 switch (cu->language)
15454 case language_cplus:
15455 low.data.const_val = 0;
15456 low_default_is_valid = 1;
15458 case language_fortran:
15459 low.data.const_val = 1;
15460 low_default_is_valid = 1;
15463 case language_objc:
15464 case language_rust:
15465 low.data.const_val = 0;
15466 low_default_is_valid = (cu->header.version >= 4);
15470 case language_pascal:
15471 low.data.const_val = 1;
15472 low_default_is_valid = (cu->header.version >= 4);
15475 low.data.const_val = 0;
15476 low_default_is_valid = 0;
15480 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
15482 attr_to_dynamic_prop (attr, die, cu, &low);
15483 else if (!low_default_is_valid)
15484 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
15485 "- DIE at 0x%x [in module %s]"),
15486 to_underlying (die->sect_off), objfile_name (cu->objfile));
15488 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
15489 if (!attr_to_dynamic_prop (attr, die, cu, &high))
15491 attr = dwarf2_attr (die, DW_AT_count, cu);
15492 if (attr_to_dynamic_prop (attr, die, cu, &high))
15494 /* If bounds are constant do the final calculation here. */
15495 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
15496 high.data.const_val = low.data.const_val + high.data.const_val - 1;
15498 high_bound_is_count = 1;
15502 /* Dwarf-2 specifications explicitly allows to create subrange types
15503 without specifying a base type.
15504 In that case, the base type must be set to the type of
15505 the lower bound, upper bound or count, in that order, if any of these
15506 three attributes references an object that has a type.
15507 If no base type is found, the Dwarf-2 specifications say that
15508 a signed integer type of size equal to the size of an address should
15510 For the following C code: `extern char gdb_int [];'
15511 GCC produces an empty range DIE.
15512 FIXME: muller/2010-05-28: Possible references to object for low bound,
15513 high bound or count are not yet handled by this code. */
15514 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
15516 struct objfile *objfile = cu->objfile;
15517 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15518 int addr_size = gdbarch_addr_bit (gdbarch) /8;
15519 struct type *int_type = objfile_type (objfile)->builtin_int;
15521 /* Test "int", "long int", and "long long int" objfile types,
15522 and select the first one having a size above or equal to the
15523 architecture address size. */
15524 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15525 base_type = int_type;
15528 int_type = objfile_type (objfile)->builtin_long;
15529 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15530 base_type = int_type;
15533 int_type = objfile_type (objfile)->builtin_long_long;
15534 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
15535 base_type = int_type;
15540 /* Normally, the DWARF producers are expected to use a signed
15541 constant form (Eg. DW_FORM_sdata) to express negative bounds.
15542 But this is unfortunately not always the case, as witnessed
15543 with GCC, for instance, where the ambiguous DW_FORM_dataN form
15544 is used instead. To work around that ambiguity, we treat
15545 the bounds as signed, and thus sign-extend their values, when
15546 the base type is signed. */
15548 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
15549 if (low.kind == PROP_CONST
15550 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
15551 low.data.const_val |= negative_mask;
15552 if (high.kind == PROP_CONST
15553 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
15554 high.data.const_val |= negative_mask;
15556 range_type = create_range_type (NULL, orig_base_type, &low, &high);
15558 if (high_bound_is_count)
15559 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
15561 /* Ada expects an empty array on no boundary attributes. */
15562 if (attr == NULL && cu->language != language_ada)
15563 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
15565 name = dwarf2_name (die, cu);
15567 TYPE_NAME (range_type) = name;
15569 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15571 TYPE_LENGTH (range_type) = DW_UNSND (attr);
15573 set_die_type (die, range_type, cu);
15575 /* set_die_type should be already done. */
15576 set_descriptive_type (range_type, die, cu);
15581 static struct type *
15582 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
15586 /* For now, we only support the C meaning of an unspecified type: void. */
15588 type = init_type (cu->objfile, TYPE_CODE_VOID, 0, NULL);
15589 TYPE_NAME (type) = dwarf2_name (die, cu);
15591 return set_die_type (die, type, cu);
15594 /* Read a single die and all its descendents. Set the die's sibling
15595 field to NULL; set other fields in the die correctly, and set all
15596 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
15597 location of the info_ptr after reading all of those dies. PARENT
15598 is the parent of the die in question. */
15600 static struct die_info *
15601 read_die_and_children (const struct die_reader_specs *reader,
15602 const gdb_byte *info_ptr,
15603 const gdb_byte **new_info_ptr,
15604 struct die_info *parent)
15606 struct die_info *die;
15607 const gdb_byte *cur_ptr;
15610 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
15613 *new_info_ptr = cur_ptr;
15616 store_in_ref_table (die, reader->cu);
15619 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
15623 *new_info_ptr = cur_ptr;
15626 die->sibling = NULL;
15627 die->parent = parent;
15631 /* Read a die, all of its descendents, and all of its siblings; set
15632 all of the fields of all of the dies correctly. Arguments are as
15633 in read_die_and_children. */
15635 static struct die_info *
15636 read_die_and_siblings_1 (const struct die_reader_specs *reader,
15637 const gdb_byte *info_ptr,
15638 const gdb_byte **new_info_ptr,
15639 struct die_info *parent)
15641 struct die_info *first_die, *last_sibling;
15642 const gdb_byte *cur_ptr;
15644 cur_ptr = info_ptr;
15645 first_die = last_sibling = NULL;
15649 struct die_info *die
15650 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
15654 *new_info_ptr = cur_ptr;
15661 last_sibling->sibling = die;
15663 last_sibling = die;
15667 /* Read a die, all of its descendents, and all of its siblings; set
15668 all of the fields of all of the dies correctly. Arguments are as
15669 in read_die_and_children.
15670 This the main entry point for reading a DIE and all its children. */
15672 static struct die_info *
15673 read_die_and_siblings (const struct die_reader_specs *reader,
15674 const gdb_byte *info_ptr,
15675 const gdb_byte **new_info_ptr,
15676 struct die_info *parent)
15678 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
15679 new_info_ptr, parent);
15681 if (dwarf_die_debug)
15683 fprintf_unfiltered (gdb_stdlog,
15684 "Read die from %s@0x%x of %s:\n",
15685 get_section_name (reader->die_section),
15686 (unsigned) (info_ptr - reader->die_section->buffer),
15687 bfd_get_filename (reader->abfd));
15688 dump_die (die, dwarf_die_debug);
15694 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
15696 The caller is responsible for filling in the extra attributes
15697 and updating (*DIEP)->num_attrs.
15698 Set DIEP to point to a newly allocated die with its information,
15699 except for its child, sibling, and parent fields.
15700 Set HAS_CHILDREN to tell whether the die has children or not. */
15702 static const gdb_byte *
15703 read_full_die_1 (const struct die_reader_specs *reader,
15704 struct die_info **diep, const gdb_byte *info_ptr,
15705 int *has_children, int num_extra_attrs)
15707 unsigned int abbrev_number, bytes_read, i;
15708 struct abbrev_info *abbrev;
15709 struct die_info *die;
15710 struct dwarf2_cu *cu = reader->cu;
15711 bfd *abfd = reader->abfd;
15713 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
15714 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
15715 info_ptr += bytes_read;
15716 if (!abbrev_number)
15723 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
15725 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
15727 bfd_get_filename (abfd));
15729 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
15730 die->sect_off = sect_off;
15731 die->tag = abbrev->tag;
15732 die->abbrev = abbrev_number;
15734 /* Make the result usable.
15735 The caller needs to update num_attrs after adding the extra
15737 die->num_attrs = abbrev->num_attrs;
15739 for (i = 0; i < abbrev->num_attrs; ++i)
15740 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
15744 *has_children = abbrev->has_children;
15748 /* Read a die and all its attributes.
15749 Set DIEP to point to a newly allocated die with its information,
15750 except for its child, sibling, and parent fields.
15751 Set HAS_CHILDREN to tell whether the die has children or not. */
15753 static const gdb_byte *
15754 read_full_die (const struct die_reader_specs *reader,
15755 struct die_info **diep, const gdb_byte *info_ptr,
15758 const gdb_byte *result;
15760 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
15762 if (dwarf_die_debug)
15764 fprintf_unfiltered (gdb_stdlog,
15765 "Read die from %s@0x%x of %s:\n",
15766 get_section_name (reader->die_section),
15767 (unsigned) (info_ptr - reader->die_section->buffer),
15768 bfd_get_filename (reader->abfd));
15769 dump_die (*diep, dwarf_die_debug);
15775 /* Abbreviation tables.
15777 In DWARF version 2, the description of the debugging information is
15778 stored in a separate .debug_abbrev section. Before we read any
15779 dies from a section we read in all abbreviations and install them
15780 in a hash table. */
15782 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
15784 static struct abbrev_info *
15785 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
15787 struct abbrev_info *abbrev;
15789 abbrev = XOBNEW (&abbrev_table->abbrev_obstack, struct abbrev_info);
15790 memset (abbrev, 0, sizeof (struct abbrev_info));
15795 /* Add an abbreviation to the table. */
15798 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
15799 unsigned int abbrev_number,
15800 struct abbrev_info *abbrev)
15802 unsigned int hash_number;
15804 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15805 abbrev->next = abbrev_table->abbrevs[hash_number];
15806 abbrev_table->abbrevs[hash_number] = abbrev;
15809 /* Look up an abbrev in the table.
15810 Returns NULL if the abbrev is not found. */
15812 static struct abbrev_info *
15813 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
15814 unsigned int abbrev_number)
15816 unsigned int hash_number;
15817 struct abbrev_info *abbrev;
15819 hash_number = abbrev_number % ABBREV_HASH_SIZE;
15820 abbrev = abbrev_table->abbrevs[hash_number];
15824 if (abbrev->number == abbrev_number)
15826 abbrev = abbrev->next;
15831 /* Read in an abbrev table. */
15833 static struct abbrev_table *
15834 abbrev_table_read_table (struct dwarf2_section_info *section,
15835 sect_offset sect_off)
15837 struct objfile *objfile = dwarf2_per_objfile->objfile;
15838 bfd *abfd = get_section_bfd_owner (section);
15839 struct abbrev_table *abbrev_table;
15840 const gdb_byte *abbrev_ptr;
15841 struct abbrev_info *cur_abbrev;
15842 unsigned int abbrev_number, bytes_read, abbrev_name;
15843 unsigned int abbrev_form;
15844 struct attr_abbrev *cur_attrs;
15845 unsigned int allocated_attrs;
15847 abbrev_table = XNEW (struct abbrev_table);
15848 abbrev_table->sect_off = sect_off;
15849 obstack_init (&abbrev_table->abbrev_obstack);
15850 abbrev_table->abbrevs =
15851 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct abbrev_info *,
15853 memset (abbrev_table->abbrevs, 0,
15854 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
15856 dwarf2_read_section (objfile, section);
15857 abbrev_ptr = section->buffer + to_underlying (sect_off);
15858 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15859 abbrev_ptr += bytes_read;
15861 allocated_attrs = ATTR_ALLOC_CHUNK;
15862 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
15864 /* Loop until we reach an abbrev number of 0. */
15865 while (abbrev_number)
15867 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
15869 /* read in abbrev header */
15870 cur_abbrev->number = abbrev_number;
15872 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15873 abbrev_ptr += bytes_read;
15874 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
15877 /* now read in declarations */
15880 LONGEST implicit_const;
15882 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15883 abbrev_ptr += bytes_read;
15884 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15885 abbrev_ptr += bytes_read;
15886 if (abbrev_form == DW_FORM_implicit_const)
15888 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
15890 abbrev_ptr += bytes_read;
15894 /* Initialize it due to a false compiler warning. */
15895 implicit_const = -1;
15898 if (abbrev_name == 0)
15901 if (cur_abbrev->num_attrs == allocated_attrs)
15903 allocated_attrs += ATTR_ALLOC_CHUNK;
15905 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
15908 cur_attrs[cur_abbrev->num_attrs].name
15909 = (enum dwarf_attribute) abbrev_name;
15910 cur_attrs[cur_abbrev->num_attrs].form
15911 = (enum dwarf_form) abbrev_form;
15912 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
15913 ++cur_abbrev->num_attrs;
15916 cur_abbrev->attrs =
15917 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
15918 cur_abbrev->num_attrs);
15919 memcpy (cur_abbrev->attrs, cur_attrs,
15920 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
15922 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
15924 /* Get next abbreviation.
15925 Under Irix6 the abbreviations for a compilation unit are not
15926 always properly terminated with an abbrev number of 0.
15927 Exit loop if we encounter an abbreviation which we have
15928 already read (which means we are about to read the abbreviations
15929 for the next compile unit) or if the end of the abbreviation
15930 table is reached. */
15931 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
15933 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
15934 abbrev_ptr += bytes_read;
15935 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
15940 return abbrev_table;
15943 /* Free the resources held by ABBREV_TABLE. */
15946 abbrev_table_free (struct abbrev_table *abbrev_table)
15948 obstack_free (&abbrev_table->abbrev_obstack, NULL);
15949 xfree (abbrev_table);
15952 /* Same as abbrev_table_free but as a cleanup.
15953 We pass in a pointer to the pointer to the table so that we can
15954 set the pointer to NULL when we're done. It also simplifies
15955 build_type_psymtabs_1. */
15958 abbrev_table_free_cleanup (void *table_ptr)
15960 struct abbrev_table **abbrev_table_ptr = (struct abbrev_table **) table_ptr;
15962 if (*abbrev_table_ptr != NULL)
15963 abbrev_table_free (*abbrev_table_ptr);
15964 *abbrev_table_ptr = NULL;
15967 /* Read the abbrev table for CU from ABBREV_SECTION. */
15970 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
15971 struct dwarf2_section_info *abbrev_section)
15974 abbrev_table_read_table (abbrev_section, cu->header.abbrev_sect_off);
15977 /* Release the memory used by the abbrev table for a compilation unit. */
15980 dwarf2_free_abbrev_table (void *ptr_to_cu)
15982 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr_to_cu;
15984 if (cu->abbrev_table != NULL)
15985 abbrev_table_free (cu->abbrev_table);
15986 /* Set this to NULL so that we SEGV if we try to read it later,
15987 and also because free_comp_unit verifies this is NULL. */
15988 cu->abbrev_table = NULL;
15991 /* Returns nonzero if TAG represents a type that we might generate a partial
15995 is_type_tag_for_partial (int tag)
16000 /* Some types that would be reasonable to generate partial symbols for,
16001 that we don't at present. */
16002 case DW_TAG_array_type:
16003 case DW_TAG_file_type:
16004 case DW_TAG_ptr_to_member_type:
16005 case DW_TAG_set_type:
16006 case DW_TAG_string_type:
16007 case DW_TAG_subroutine_type:
16009 case DW_TAG_base_type:
16010 case DW_TAG_class_type:
16011 case DW_TAG_interface_type:
16012 case DW_TAG_enumeration_type:
16013 case DW_TAG_structure_type:
16014 case DW_TAG_subrange_type:
16015 case DW_TAG_typedef:
16016 case DW_TAG_union_type:
16023 /* Load all DIEs that are interesting for partial symbols into memory. */
16025 static struct partial_die_info *
16026 load_partial_dies (const struct die_reader_specs *reader,
16027 const gdb_byte *info_ptr, int building_psymtab)
16029 struct dwarf2_cu *cu = reader->cu;
16030 struct objfile *objfile = cu->objfile;
16031 struct partial_die_info *part_die;
16032 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
16033 struct abbrev_info *abbrev;
16034 unsigned int bytes_read;
16035 unsigned int load_all = 0;
16036 int nesting_level = 1;
16041 gdb_assert (cu->per_cu != NULL);
16042 if (cu->per_cu->load_all_dies)
16046 = htab_create_alloc_ex (cu->header.length / 12,
16050 &cu->comp_unit_obstack,
16051 hashtab_obstack_allocate,
16052 dummy_obstack_deallocate);
16054 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
16058 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
16060 /* A NULL abbrev means the end of a series of children. */
16061 if (abbrev == NULL)
16063 if (--nesting_level == 0)
16065 /* PART_DIE was probably the last thing allocated on the
16066 comp_unit_obstack, so we could call obstack_free
16067 here. We don't do that because the waste is small,
16068 and will be cleaned up when we're done with this
16069 compilation unit. This way, we're also more robust
16070 against other users of the comp_unit_obstack. */
16073 info_ptr += bytes_read;
16074 last_die = parent_die;
16075 parent_die = parent_die->die_parent;
16079 /* Check for template arguments. We never save these; if
16080 they're seen, we just mark the parent, and go on our way. */
16081 if (parent_die != NULL
16082 && cu->language == language_cplus
16083 && (abbrev->tag == DW_TAG_template_type_param
16084 || abbrev->tag == DW_TAG_template_value_param))
16086 parent_die->has_template_arguments = 1;
16090 /* We don't need a partial DIE for the template argument. */
16091 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16096 /* We only recurse into c++ subprograms looking for template arguments.
16097 Skip their other children. */
16099 && cu->language == language_cplus
16100 && parent_die != NULL
16101 && parent_die->tag == DW_TAG_subprogram)
16103 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16107 /* Check whether this DIE is interesting enough to save. Normally
16108 we would not be interested in members here, but there may be
16109 later variables referencing them via DW_AT_specification (for
16110 static members). */
16112 && !is_type_tag_for_partial (abbrev->tag)
16113 && abbrev->tag != DW_TAG_constant
16114 && abbrev->tag != DW_TAG_enumerator
16115 && abbrev->tag != DW_TAG_subprogram
16116 && abbrev->tag != DW_TAG_lexical_block
16117 && abbrev->tag != DW_TAG_variable
16118 && abbrev->tag != DW_TAG_namespace
16119 && abbrev->tag != DW_TAG_module
16120 && abbrev->tag != DW_TAG_member
16121 && abbrev->tag != DW_TAG_imported_unit
16122 && abbrev->tag != DW_TAG_imported_declaration)
16124 /* Otherwise we skip to the next sibling, if any. */
16125 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16129 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
16132 /* This two-pass algorithm for processing partial symbols has a
16133 high cost in cache pressure. Thus, handle some simple cases
16134 here which cover the majority of C partial symbols. DIEs
16135 which neither have specification tags in them, nor could have
16136 specification tags elsewhere pointing at them, can simply be
16137 processed and discarded.
16139 This segment is also optional; scan_partial_symbols and
16140 add_partial_symbol will handle these DIEs if we chain
16141 them in normally. When compilers which do not emit large
16142 quantities of duplicate debug information are more common,
16143 this code can probably be removed. */
16145 /* Any complete simple types at the top level (pretty much all
16146 of them, for a language without namespaces), can be processed
16148 if (parent_die == NULL
16149 && part_die->has_specification == 0
16150 && part_die->is_declaration == 0
16151 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
16152 || part_die->tag == DW_TAG_base_type
16153 || part_die->tag == DW_TAG_subrange_type))
16155 if (building_psymtab && part_die->name != NULL)
16156 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16157 VAR_DOMAIN, LOC_TYPEDEF,
16158 &objfile->static_psymbols,
16159 0, cu->language, objfile);
16160 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16164 /* The exception for DW_TAG_typedef with has_children above is
16165 a workaround of GCC PR debug/47510. In the case of this complaint
16166 type_name_no_tag_or_error will error on such types later.
16168 GDB skipped children of DW_TAG_typedef by the shortcut above and then
16169 it could not find the child DIEs referenced later, this is checked
16170 above. In correct DWARF DW_TAG_typedef should have no children. */
16172 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
16173 complaint (&symfile_complaints,
16174 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
16175 "- DIE at 0x%x [in module %s]"),
16176 to_underlying (part_die->sect_off), objfile_name (objfile));
16178 /* If we're at the second level, and we're an enumerator, and
16179 our parent has no specification (meaning possibly lives in a
16180 namespace elsewhere), then we can add the partial symbol now
16181 instead of queueing it. */
16182 if (part_die->tag == DW_TAG_enumerator
16183 && parent_die != NULL
16184 && parent_die->die_parent == NULL
16185 && parent_die->tag == DW_TAG_enumeration_type
16186 && parent_die->has_specification == 0)
16188 if (part_die->name == NULL)
16189 complaint (&symfile_complaints,
16190 _("malformed enumerator DIE ignored"));
16191 else if (building_psymtab)
16192 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16193 VAR_DOMAIN, LOC_CONST,
16194 cu->language == language_cplus
16195 ? &objfile->global_psymbols
16196 : &objfile->static_psymbols,
16197 0, cu->language, objfile);
16199 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16203 /* We'll save this DIE so link it in. */
16204 part_die->die_parent = parent_die;
16205 part_die->die_sibling = NULL;
16206 part_die->die_child = NULL;
16208 if (last_die && last_die == parent_die)
16209 last_die->die_child = part_die;
16211 last_die->die_sibling = part_die;
16213 last_die = part_die;
16215 if (first_die == NULL)
16216 first_die = part_die;
16218 /* Maybe add the DIE to the hash table. Not all DIEs that we
16219 find interesting need to be in the hash table, because we
16220 also have the parent/sibling/child chains; only those that we
16221 might refer to by offset later during partial symbol reading.
16223 For now this means things that might have be the target of a
16224 DW_AT_specification, DW_AT_abstract_origin, or
16225 DW_AT_extension. DW_AT_extension will refer only to
16226 namespaces; DW_AT_abstract_origin refers to functions (and
16227 many things under the function DIE, but we do not recurse
16228 into function DIEs during partial symbol reading) and
16229 possibly variables as well; DW_AT_specification refers to
16230 declarations. Declarations ought to have the DW_AT_declaration
16231 flag. It happens that GCC forgets to put it in sometimes, but
16232 only for functions, not for types.
16234 Adding more things than necessary to the hash table is harmless
16235 except for the performance cost. Adding too few will result in
16236 wasted time in find_partial_die, when we reread the compilation
16237 unit with load_all_dies set. */
16240 || abbrev->tag == DW_TAG_constant
16241 || abbrev->tag == DW_TAG_subprogram
16242 || abbrev->tag == DW_TAG_variable
16243 || abbrev->tag == DW_TAG_namespace
16244 || part_die->is_declaration)
16248 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
16249 to_underlying (part_die->sect_off),
16254 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
16256 /* For some DIEs we want to follow their children (if any). For C
16257 we have no reason to follow the children of structures; for other
16258 languages we have to, so that we can get at method physnames
16259 to infer fully qualified class names, for DW_AT_specification,
16260 and for C++ template arguments. For C++, we also look one level
16261 inside functions to find template arguments (if the name of the
16262 function does not already contain the template arguments).
16264 For Ada, we need to scan the children of subprograms and lexical
16265 blocks as well because Ada allows the definition of nested
16266 entities that could be interesting for the debugger, such as
16267 nested subprograms for instance. */
16268 if (last_die->has_children
16270 || last_die->tag == DW_TAG_namespace
16271 || last_die->tag == DW_TAG_module
16272 || last_die->tag == DW_TAG_enumeration_type
16273 || (cu->language == language_cplus
16274 && last_die->tag == DW_TAG_subprogram
16275 && (last_die->name == NULL
16276 || strchr (last_die->name, '<') == NULL))
16277 || (cu->language != language_c
16278 && (last_die->tag == DW_TAG_class_type
16279 || last_die->tag == DW_TAG_interface_type
16280 || last_die->tag == DW_TAG_structure_type
16281 || last_die->tag == DW_TAG_union_type))
16282 || (cu->language == language_ada
16283 && (last_die->tag == DW_TAG_subprogram
16284 || last_die->tag == DW_TAG_lexical_block))))
16287 parent_die = last_die;
16291 /* Otherwise we skip to the next sibling, if any. */
16292 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
16294 /* Back to the top, do it again. */
16298 /* Read a minimal amount of information into the minimal die structure. */
16300 static const gdb_byte *
16301 read_partial_die (const struct die_reader_specs *reader,
16302 struct partial_die_info *part_die,
16303 struct abbrev_info *abbrev, unsigned int abbrev_len,
16304 const gdb_byte *info_ptr)
16306 struct dwarf2_cu *cu = reader->cu;
16307 struct objfile *objfile = cu->objfile;
16308 const gdb_byte *buffer = reader->buffer;
16310 struct attribute attr;
16311 int has_low_pc_attr = 0;
16312 int has_high_pc_attr = 0;
16313 int high_pc_relative = 0;
16315 memset (part_die, 0, sizeof (struct partial_die_info));
16317 part_die->sect_off = (sect_offset) (info_ptr - buffer);
16319 info_ptr += abbrev_len;
16321 if (abbrev == NULL)
16324 part_die->tag = abbrev->tag;
16325 part_die->has_children = abbrev->has_children;
16327 for (i = 0; i < abbrev->num_attrs; ++i)
16329 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
16331 /* Store the data if it is of an attribute we want to keep in a
16332 partial symbol table. */
16336 switch (part_die->tag)
16338 case DW_TAG_compile_unit:
16339 case DW_TAG_partial_unit:
16340 case DW_TAG_type_unit:
16341 /* Compilation units have a DW_AT_name that is a filename, not
16342 a source language identifier. */
16343 case DW_TAG_enumeration_type:
16344 case DW_TAG_enumerator:
16345 /* These tags always have simple identifiers already; no need
16346 to canonicalize them. */
16347 part_die->name = DW_STRING (&attr);
16351 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
16352 &objfile->per_bfd->storage_obstack);
16356 case DW_AT_linkage_name:
16357 case DW_AT_MIPS_linkage_name:
16358 /* Note that both forms of linkage name might appear. We
16359 assume they will be the same, and we only store the last
16361 if (cu->language == language_ada)
16362 part_die->name = DW_STRING (&attr);
16363 part_die->linkage_name = DW_STRING (&attr);
16366 has_low_pc_attr = 1;
16367 part_die->lowpc = attr_value_as_address (&attr);
16369 case DW_AT_high_pc:
16370 has_high_pc_attr = 1;
16371 part_die->highpc = attr_value_as_address (&attr);
16372 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
16373 high_pc_relative = 1;
16375 case DW_AT_location:
16376 /* Support the .debug_loc offsets. */
16377 if (attr_form_is_block (&attr))
16379 part_die->d.locdesc = DW_BLOCK (&attr);
16381 else if (attr_form_is_section_offset (&attr))
16383 dwarf2_complex_location_expr_complaint ();
16387 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16388 "partial symbol information");
16391 case DW_AT_external:
16392 part_die->is_external = DW_UNSND (&attr);
16394 case DW_AT_declaration:
16395 part_die->is_declaration = DW_UNSND (&attr);
16398 part_die->has_type = 1;
16400 case DW_AT_abstract_origin:
16401 case DW_AT_specification:
16402 case DW_AT_extension:
16403 part_die->has_specification = 1;
16404 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
16405 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
16406 || cu->per_cu->is_dwz);
16408 case DW_AT_sibling:
16409 /* Ignore absolute siblings, they might point outside of
16410 the current compile unit. */
16411 if (attr.form == DW_FORM_ref_addr)
16412 complaint (&symfile_complaints,
16413 _("ignoring absolute DW_AT_sibling"));
16416 sect_offset off = dwarf2_get_ref_die_offset (&attr);
16417 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
16419 if (sibling_ptr < info_ptr)
16420 complaint (&symfile_complaints,
16421 _("DW_AT_sibling points backwards"));
16422 else if (sibling_ptr > reader->buffer_end)
16423 dwarf2_section_buffer_overflow_complaint (reader->die_section);
16425 part_die->sibling = sibling_ptr;
16428 case DW_AT_byte_size:
16429 part_die->has_byte_size = 1;
16431 case DW_AT_const_value:
16432 part_die->has_const_value = 1;
16434 case DW_AT_calling_convention:
16435 /* DWARF doesn't provide a way to identify a program's source-level
16436 entry point. DW_AT_calling_convention attributes are only meant
16437 to describe functions' calling conventions.
16439 However, because it's a necessary piece of information in
16440 Fortran, and before DWARF 4 DW_CC_program was the only
16441 piece of debugging information whose definition refers to
16442 a 'main program' at all, several compilers marked Fortran
16443 main programs with DW_CC_program --- even when those
16444 functions use the standard calling conventions.
16446 Although DWARF now specifies a way to provide this
16447 information, we support this practice for backward
16449 if (DW_UNSND (&attr) == DW_CC_program
16450 && cu->language == language_fortran)
16451 part_die->main_subprogram = 1;
16454 if (DW_UNSND (&attr) == DW_INL_inlined
16455 || DW_UNSND (&attr) == DW_INL_declared_inlined)
16456 part_die->may_be_inlined = 1;
16460 if (part_die->tag == DW_TAG_imported_unit)
16462 part_die->d.sect_off = dwarf2_get_ref_die_offset (&attr);
16463 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
16464 || cu->per_cu->is_dwz);
16468 case DW_AT_main_subprogram:
16469 part_die->main_subprogram = DW_UNSND (&attr);
16477 if (high_pc_relative)
16478 part_die->highpc += part_die->lowpc;
16480 if (has_low_pc_attr && has_high_pc_attr)
16482 /* When using the GNU linker, .gnu.linkonce. sections are used to
16483 eliminate duplicate copies of functions and vtables and such.
16484 The linker will arbitrarily choose one and discard the others.
16485 The AT_*_pc values for such functions refer to local labels in
16486 these sections. If the section from that file was discarded, the
16487 labels are not in the output, so the relocs get a value of 0.
16488 If this is a discarded function, mark the pc bounds as invalid,
16489 so that GDB will ignore it. */
16490 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
16492 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16494 complaint (&symfile_complaints,
16495 _("DW_AT_low_pc %s is zero "
16496 "for DIE at 0x%x [in module %s]"),
16497 paddress (gdbarch, part_die->lowpc),
16498 to_underlying (part_die->sect_off), objfile_name (objfile));
16500 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
16501 else if (part_die->lowpc >= part_die->highpc)
16503 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16505 complaint (&symfile_complaints,
16506 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
16507 "for DIE at 0x%x [in module %s]"),
16508 paddress (gdbarch, part_die->lowpc),
16509 paddress (gdbarch, part_die->highpc),
16510 to_underlying (part_die->sect_off),
16511 objfile_name (objfile));
16514 part_die->has_pc_info = 1;
16520 /* Find a cached partial DIE at OFFSET in CU. */
16522 static struct partial_die_info *
16523 find_partial_die_in_comp_unit (sect_offset sect_off, struct dwarf2_cu *cu)
16525 struct partial_die_info *lookup_die = NULL;
16526 struct partial_die_info part_die;
16528 part_die.sect_off = sect_off;
16529 lookup_die = ((struct partial_die_info *)
16530 htab_find_with_hash (cu->partial_dies, &part_die,
16531 to_underlying (sect_off)));
16536 /* Find a partial DIE at OFFSET, which may or may not be in CU,
16537 except in the case of .debug_types DIEs which do not reference
16538 outside their CU (they do however referencing other types via
16539 DW_FORM_ref_sig8). */
16541 static struct partial_die_info *
16542 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
16544 struct objfile *objfile = cu->objfile;
16545 struct dwarf2_per_cu_data *per_cu = NULL;
16546 struct partial_die_info *pd = NULL;
16548 if (offset_in_dwz == cu->per_cu->is_dwz
16549 && offset_in_cu_p (&cu->header, sect_off))
16551 pd = find_partial_die_in_comp_unit (sect_off, cu);
16554 /* We missed recording what we needed.
16555 Load all dies and try again. */
16556 per_cu = cu->per_cu;
16560 /* TUs don't reference other CUs/TUs (except via type signatures). */
16561 if (cu->per_cu->is_debug_types)
16563 error (_("Dwarf Error: Type Unit at offset 0x%x contains"
16564 " external reference to offset 0x%x [in module %s].\n"),
16565 to_underlying (cu->header.sect_off), to_underlying (sect_off),
16566 bfd_get_filename (objfile->obfd));
16568 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
16571 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
16572 load_partial_comp_unit (per_cu);
16574 per_cu->cu->last_used = 0;
16575 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
16578 /* If we didn't find it, and not all dies have been loaded,
16579 load them all and try again. */
16581 if (pd == NULL && per_cu->load_all_dies == 0)
16583 per_cu->load_all_dies = 1;
16585 /* This is nasty. When we reread the DIEs, somewhere up the call chain
16586 THIS_CU->cu may already be in use. So we can't just free it and
16587 replace its DIEs with the ones we read in. Instead, we leave those
16588 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
16589 and clobber THIS_CU->cu->partial_dies with the hash table for the new
16591 load_partial_comp_unit (per_cu);
16593 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
16597 internal_error (__FILE__, __LINE__,
16598 _("could not find partial DIE 0x%x "
16599 "in cache [from module %s]\n"),
16600 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
16604 /* See if we can figure out if the class lives in a namespace. We do
16605 this by looking for a member function; its demangled name will
16606 contain namespace info, if there is any. */
16609 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
16610 struct dwarf2_cu *cu)
16612 /* NOTE: carlton/2003-10-07: Getting the info this way changes
16613 what template types look like, because the demangler
16614 frequently doesn't give the same name as the debug info. We
16615 could fix this by only using the demangled name to get the
16616 prefix (but see comment in read_structure_type). */
16618 struct partial_die_info *real_pdi;
16619 struct partial_die_info *child_pdi;
16621 /* If this DIE (this DIE's specification, if any) has a parent, then
16622 we should not do this. We'll prepend the parent's fully qualified
16623 name when we create the partial symbol. */
16625 real_pdi = struct_pdi;
16626 while (real_pdi->has_specification)
16627 real_pdi = find_partial_die (real_pdi->spec_offset,
16628 real_pdi->spec_is_dwz, cu);
16630 if (real_pdi->die_parent != NULL)
16633 for (child_pdi = struct_pdi->die_child;
16635 child_pdi = child_pdi->die_sibling)
16637 if (child_pdi->tag == DW_TAG_subprogram
16638 && child_pdi->linkage_name != NULL)
16640 char *actual_class_name
16641 = language_class_name_from_physname (cu->language_defn,
16642 child_pdi->linkage_name);
16643 if (actual_class_name != NULL)
16647 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16649 strlen (actual_class_name)));
16650 xfree (actual_class_name);
16657 /* Adjust PART_DIE before generating a symbol for it. This function
16658 may set the is_external flag or change the DIE's name. */
16661 fixup_partial_die (struct partial_die_info *part_die,
16662 struct dwarf2_cu *cu)
16664 /* Once we've fixed up a die, there's no point in doing so again.
16665 This also avoids a memory leak if we were to call
16666 guess_partial_die_structure_name multiple times. */
16667 if (part_die->fixup_called)
16670 /* If we found a reference attribute and the DIE has no name, try
16671 to find a name in the referred to DIE. */
16673 if (part_die->name == NULL && part_die->has_specification)
16675 struct partial_die_info *spec_die;
16677 spec_die = find_partial_die (part_die->spec_offset,
16678 part_die->spec_is_dwz, cu);
16680 fixup_partial_die (spec_die, cu);
16682 if (spec_die->name)
16684 part_die->name = spec_die->name;
16686 /* Copy DW_AT_external attribute if it is set. */
16687 if (spec_die->is_external)
16688 part_die->is_external = spec_die->is_external;
16692 /* Set default names for some unnamed DIEs. */
16694 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
16695 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
16697 /* If there is no parent die to provide a namespace, and there are
16698 children, see if we can determine the namespace from their linkage
16700 if (cu->language == language_cplus
16701 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
16702 && part_die->die_parent == NULL
16703 && part_die->has_children
16704 && (part_die->tag == DW_TAG_class_type
16705 || part_die->tag == DW_TAG_structure_type
16706 || part_die->tag == DW_TAG_union_type))
16707 guess_partial_die_structure_name (part_die, cu);
16709 /* GCC might emit a nameless struct or union that has a linkage
16710 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
16711 if (part_die->name == NULL
16712 && (part_die->tag == DW_TAG_class_type
16713 || part_die->tag == DW_TAG_interface_type
16714 || part_die->tag == DW_TAG_structure_type
16715 || part_die->tag == DW_TAG_union_type)
16716 && part_die->linkage_name != NULL)
16720 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
16725 /* Strip any leading namespaces/classes, keep only the base name.
16726 DW_AT_name for named DIEs does not contain the prefixes. */
16727 base = strrchr (demangled, ':');
16728 if (base && base > demangled && base[-1] == ':')
16735 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
16736 base, strlen (base)));
16741 part_die->fixup_called = 1;
16744 /* Read an attribute value described by an attribute form. */
16746 static const gdb_byte *
16747 read_attribute_value (const struct die_reader_specs *reader,
16748 struct attribute *attr, unsigned form,
16749 LONGEST implicit_const, const gdb_byte *info_ptr)
16751 struct dwarf2_cu *cu = reader->cu;
16752 struct objfile *objfile = cu->objfile;
16753 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16754 bfd *abfd = reader->abfd;
16755 struct comp_unit_head *cu_header = &cu->header;
16756 unsigned int bytes_read;
16757 struct dwarf_block *blk;
16759 attr->form = (enum dwarf_form) form;
16762 case DW_FORM_ref_addr:
16763 if (cu->header.version == 2)
16764 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16766 DW_UNSND (attr) = read_offset (abfd, info_ptr,
16767 &cu->header, &bytes_read);
16768 info_ptr += bytes_read;
16770 case DW_FORM_GNU_ref_alt:
16771 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16772 info_ptr += bytes_read;
16775 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
16776 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
16777 info_ptr += bytes_read;
16779 case DW_FORM_block2:
16780 blk = dwarf_alloc_block (cu);
16781 blk->size = read_2_bytes (abfd, info_ptr);
16783 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16784 info_ptr += blk->size;
16785 DW_BLOCK (attr) = blk;
16787 case DW_FORM_block4:
16788 blk = dwarf_alloc_block (cu);
16789 blk->size = read_4_bytes (abfd, info_ptr);
16791 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16792 info_ptr += blk->size;
16793 DW_BLOCK (attr) = blk;
16795 case DW_FORM_data2:
16796 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
16799 case DW_FORM_data4:
16800 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
16803 case DW_FORM_data8:
16804 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
16807 case DW_FORM_data16:
16808 blk = dwarf_alloc_block (cu);
16810 blk->data = read_n_bytes (abfd, info_ptr, 16);
16812 DW_BLOCK (attr) = blk;
16814 case DW_FORM_sec_offset:
16815 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
16816 info_ptr += bytes_read;
16818 case DW_FORM_string:
16819 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
16820 DW_STRING_IS_CANONICAL (attr) = 0;
16821 info_ptr += bytes_read;
16824 if (!cu->per_cu->is_dwz)
16826 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
16828 DW_STRING_IS_CANONICAL (attr) = 0;
16829 info_ptr += bytes_read;
16833 case DW_FORM_line_strp:
16834 if (!cu->per_cu->is_dwz)
16836 DW_STRING (attr) = read_indirect_line_string (abfd, info_ptr,
16837 cu_header, &bytes_read);
16838 DW_STRING_IS_CANONICAL (attr) = 0;
16839 info_ptr += bytes_read;
16843 case DW_FORM_GNU_strp_alt:
16845 struct dwz_file *dwz = dwarf2_get_dwz_file ();
16846 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
16849 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
16850 DW_STRING_IS_CANONICAL (attr) = 0;
16851 info_ptr += bytes_read;
16854 case DW_FORM_exprloc:
16855 case DW_FORM_block:
16856 blk = dwarf_alloc_block (cu);
16857 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16858 info_ptr += bytes_read;
16859 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16860 info_ptr += blk->size;
16861 DW_BLOCK (attr) = blk;
16863 case DW_FORM_block1:
16864 blk = dwarf_alloc_block (cu);
16865 blk->size = read_1_byte (abfd, info_ptr);
16867 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
16868 info_ptr += blk->size;
16869 DW_BLOCK (attr) = blk;
16871 case DW_FORM_data1:
16872 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16876 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
16879 case DW_FORM_flag_present:
16880 DW_UNSND (attr) = 1;
16882 case DW_FORM_sdata:
16883 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
16884 info_ptr += bytes_read;
16886 case DW_FORM_udata:
16887 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16888 info_ptr += bytes_read;
16891 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16892 + read_1_byte (abfd, info_ptr));
16896 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16897 + read_2_bytes (abfd, info_ptr));
16901 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16902 + read_4_bytes (abfd, info_ptr));
16906 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16907 + read_8_bytes (abfd, info_ptr));
16910 case DW_FORM_ref_sig8:
16911 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
16914 case DW_FORM_ref_udata:
16915 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
16916 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
16917 info_ptr += bytes_read;
16919 case DW_FORM_indirect:
16920 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16921 info_ptr += bytes_read;
16922 if (form == DW_FORM_implicit_const)
16924 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
16925 info_ptr += bytes_read;
16927 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
16930 case DW_FORM_implicit_const:
16931 DW_SND (attr) = implicit_const;
16933 case DW_FORM_GNU_addr_index:
16934 if (reader->dwo_file == NULL)
16936 /* For now flag a hard error.
16937 Later we can turn this into a complaint. */
16938 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16939 dwarf_form_name (form),
16940 bfd_get_filename (abfd));
16942 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
16943 info_ptr += bytes_read;
16945 case DW_FORM_GNU_str_index:
16946 if (reader->dwo_file == NULL)
16948 /* For now flag a hard error.
16949 Later we can turn this into a complaint if warranted. */
16950 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
16951 dwarf_form_name (form),
16952 bfd_get_filename (abfd));
16955 ULONGEST str_index =
16956 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16958 DW_STRING (attr) = read_str_index (reader, str_index);
16959 DW_STRING_IS_CANONICAL (attr) = 0;
16960 info_ptr += bytes_read;
16964 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
16965 dwarf_form_name (form),
16966 bfd_get_filename (abfd));
16970 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
16971 attr->form = DW_FORM_GNU_ref_alt;
16973 /* We have seen instances where the compiler tried to emit a byte
16974 size attribute of -1 which ended up being encoded as an unsigned
16975 0xffffffff. Although 0xffffffff is technically a valid size value,
16976 an object of this size seems pretty unlikely so we can relatively
16977 safely treat these cases as if the size attribute was invalid and
16978 treat them as zero by default. */
16979 if (attr->name == DW_AT_byte_size
16980 && form == DW_FORM_data4
16981 && DW_UNSND (attr) >= 0xffffffff)
16984 (&symfile_complaints,
16985 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
16986 hex_string (DW_UNSND (attr)));
16987 DW_UNSND (attr) = 0;
16993 /* Read an attribute described by an abbreviated attribute. */
16995 static const gdb_byte *
16996 read_attribute (const struct die_reader_specs *reader,
16997 struct attribute *attr, struct attr_abbrev *abbrev,
16998 const gdb_byte *info_ptr)
17000 attr->name = abbrev->name;
17001 return read_attribute_value (reader, attr, abbrev->form,
17002 abbrev->implicit_const, info_ptr);
17005 /* Read dwarf information from a buffer. */
17007 static unsigned int
17008 read_1_byte (bfd *abfd, const gdb_byte *buf)
17010 return bfd_get_8 (abfd, buf);
17014 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
17016 return bfd_get_signed_8 (abfd, buf);
17019 static unsigned int
17020 read_2_bytes (bfd *abfd, const gdb_byte *buf)
17022 return bfd_get_16 (abfd, buf);
17026 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
17028 return bfd_get_signed_16 (abfd, buf);
17031 static unsigned int
17032 read_4_bytes (bfd *abfd, const gdb_byte *buf)
17034 return bfd_get_32 (abfd, buf);
17038 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
17040 return bfd_get_signed_32 (abfd, buf);
17044 read_8_bytes (bfd *abfd, const gdb_byte *buf)
17046 return bfd_get_64 (abfd, buf);
17050 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
17051 unsigned int *bytes_read)
17053 struct comp_unit_head *cu_header = &cu->header;
17054 CORE_ADDR retval = 0;
17056 if (cu_header->signed_addr_p)
17058 switch (cu_header->addr_size)
17061 retval = bfd_get_signed_16 (abfd, buf);
17064 retval = bfd_get_signed_32 (abfd, buf);
17067 retval = bfd_get_signed_64 (abfd, buf);
17070 internal_error (__FILE__, __LINE__,
17071 _("read_address: bad switch, signed [in module %s]"),
17072 bfd_get_filename (abfd));
17077 switch (cu_header->addr_size)
17080 retval = bfd_get_16 (abfd, buf);
17083 retval = bfd_get_32 (abfd, buf);
17086 retval = bfd_get_64 (abfd, buf);
17089 internal_error (__FILE__, __LINE__,
17090 _("read_address: bad switch, "
17091 "unsigned [in module %s]"),
17092 bfd_get_filename (abfd));
17096 *bytes_read = cu_header->addr_size;
17100 /* Read the initial length from a section. The (draft) DWARF 3
17101 specification allows the initial length to take up either 4 bytes
17102 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
17103 bytes describe the length and all offsets will be 8 bytes in length
17106 An older, non-standard 64-bit format is also handled by this
17107 function. The older format in question stores the initial length
17108 as an 8-byte quantity without an escape value. Lengths greater
17109 than 2^32 aren't very common which means that the initial 4 bytes
17110 is almost always zero. Since a length value of zero doesn't make
17111 sense for the 32-bit format, this initial zero can be considered to
17112 be an escape value which indicates the presence of the older 64-bit
17113 format. As written, the code can't detect (old format) lengths
17114 greater than 4GB. If it becomes necessary to handle lengths
17115 somewhat larger than 4GB, we could allow other small values (such
17116 as the non-sensical values of 1, 2, and 3) to also be used as
17117 escape values indicating the presence of the old format.
17119 The value returned via bytes_read should be used to increment the
17120 relevant pointer after calling read_initial_length().
17122 [ Note: read_initial_length() and read_offset() are based on the
17123 document entitled "DWARF Debugging Information Format", revision
17124 3, draft 8, dated November 19, 2001. This document was obtained
17127 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
17129 This document is only a draft and is subject to change. (So beware.)
17131 Details regarding the older, non-standard 64-bit format were
17132 determined empirically by examining 64-bit ELF files produced by
17133 the SGI toolchain on an IRIX 6.5 machine.
17135 - Kevin, July 16, 2002
17139 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
17141 LONGEST length = bfd_get_32 (abfd, buf);
17143 if (length == 0xffffffff)
17145 length = bfd_get_64 (abfd, buf + 4);
17148 else if (length == 0)
17150 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
17151 length = bfd_get_64 (abfd, buf);
17162 /* Cover function for read_initial_length.
17163 Returns the length of the object at BUF, and stores the size of the
17164 initial length in *BYTES_READ and stores the size that offsets will be in
17166 If the initial length size is not equivalent to that specified in
17167 CU_HEADER then issue a complaint.
17168 This is useful when reading non-comp-unit headers. */
17171 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
17172 const struct comp_unit_head *cu_header,
17173 unsigned int *bytes_read,
17174 unsigned int *offset_size)
17176 LONGEST length = read_initial_length (abfd, buf, bytes_read);
17178 gdb_assert (cu_header->initial_length_size == 4
17179 || cu_header->initial_length_size == 8
17180 || cu_header->initial_length_size == 12);
17182 if (cu_header->initial_length_size != *bytes_read)
17183 complaint (&symfile_complaints,
17184 _("intermixed 32-bit and 64-bit DWARF sections"));
17186 *offset_size = (*bytes_read == 4) ? 4 : 8;
17190 /* Read an offset from the data stream. The size of the offset is
17191 given by cu_header->offset_size. */
17194 read_offset (bfd *abfd, const gdb_byte *buf,
17195 const struct comp_unit_head *cu_header,
17196 unsigned int *bytes_read)
17198 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
17200 *bytes_read = cu_header->offset_size;
17204 /* Read an offset from the data stream. */
17207 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
17209 LONGEST retval = 0;
17211 switch (offset_size)
17214 retval = bfd_get_32 (abfd, buf);
17217 retval = bfd_get_64 (abfd, buf);
17220 internal_error (__FILE__, __LINE__,
17221 _("read_offset_1: bad switch [in module %s]"),
17222 bfd_get_filename (abfd));
17228 static const gdb_byte *
17229 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
17231 /* If the size of a host char is 8 bits, we can return a pointer
17232 to the buffer, otherwise we have to copy the data to a buffer
17233 allocated on the temporary obstack. */
17234 gdb_assert (HOST_CHAR_BIT == 8);
17238 static const char *
17239 read_direct_string (bfd *abfd, const gdb_byte *buf,
17240 unsigned int *bytes_read_ptr)
17242 /* If the size of a host char is 8 bits, we can return a pointer
17243 to the string, otherwise we have to copy the string to a buffer
17244 allocated on the temporary obstack. */
17245 gdb_assert (HOST_CHAR_BIT == 8);
17248 *bytes_read_ptr = 1;
17251 *bytes_read_ptr = strlen ((const char *) buf) + 1;
17252 return (const char *) buf;
17255 /* Return pointer to string at section SECT offset STR_OFFSET with error
17256 reporting strings FORM_NAME and SECT_NAME. */
17258 static const char *
17259 read_indirect_string_at_offset_from (bfd *abfd, LONGEST str_offset,
17260 struct dwarf2_section_info *sect,
17261 const char *form_name,
17262 const char *sect_name)
17264 dwarf2_read_section (dwarf2_per_objfile->objfile, sect);
17265 if (sect->buffer == NULL)
17266 error (_("%s used without %s section [in module %s]"),
17267 form_name, sect_name, bfd_get_filename (abfd));
17268 if (str_offset >= sect->size)
17269 error (_("%s pointing outside of %s section [in module %s]"),
17270 form_name, sect_name, bfd_get_filename (abfd));
17271 gdb_assert (HOST_CHAR_BIT == 8);
17272 if (sect->buffer[str_offset] == '\0')
17274 return (const char *) (sect->buffer + str_offset);
17277 /* Return pointer to string at .debug_str offset STR_OFFSET. */
17279 static const char *
17280 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
17282 return read_indirect_string_at_offset_from (abfd, str_offset,
17283 &dwarf2_per_objfile->str,
17284 "DW_FORM_strp", ".debug_str");
17287 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
17289 static const char *
17290 read_indirect_line_string_at_offset (bfd *abfd, LONGEST str_offset)
17292 return read_indirect_string_at_offset_from (abfd, str_offset,
17293 &dwarf2_per_objfile->line_str,
17294 "DW_FORM_line_strp",
17295 ".debug_line_str");
17298 /* Read a string at offset STR_OFFSET in the .debug_str section from
17299 the .dwz file DWZ. Throw an error if the offset is too large. If
17300 the string consists of a single NUL byte, return NULL; otherwise
17301 return a pointer to the string. */
17303 static const char *
17304 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
17306 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
17308 if (dwz->str.buffer == NULL)
17309 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
17310 "section [in module %s]"),
17311 bfd_get_filename (dwz->dwz_bfd));
17312 if (str_offset >= dwz->str.size)
17313 error (_("DW_FORM_GNU_strp_alt pointing outside of "
17314 ".debug_str section [in module %s]"),
17315 bfd_get_filename (dwz->dwz_bfd));
17316 gdb_assert (HOST_CHAR_BIT == 8);
17317 if (dwz->str.buffer[str_offset] == '\0')
17319 return (const char *) (dwz->str.buffer + str_offset);
17322 /* Return pointer to string at .debug_str offset as read from BUF.
17323 BUF is assumed to be in a compilation unit described by CU_HEADER.
17324 Return *BYTES_READ_PTR count of bytes read from BUF. */
17326 static const char *
17327 read_indirect_string (bfd *abfd, const gdb_byte *buf,
17328 const struct comp_unit_head *cu_header,
17329 unsigned int *bytes_read_ptr)
17331 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17333 return read_indirect_string_at_offset (abfd, str_offset);
17336 /* Return pointer to string at .debug_line_str offset as read from BUF.
17337 BUF is assumed to be in a compilation unit described by CU_HEADER.
17338 Return *BYTES_READ_PTR count of bytes read from BUF. */
17340 static const char *
17341 read_indirect_line_string (bfd *abfd, const gdb_byte *buf,
17342 const struct comp_unit_head *cu_header,
17343 unsigned int *bytes_read_ptr)
17345 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17347 return read_indirect_line_string_at_offset (abfd, str_offset);
17351 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
17352 unsigned int *bytes_read_ptr)
17355 unsigned int num_read;
17357 unsigned char byte;
17364 byte = bfd_get_8 (abfd, buf);
17367 result |= ((ULONGEST) (byte & 127) << shift);
17368 if ((byte & 128) == 0)
17374 *bytes_read_ptr = num_read;
17379 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
17380 unsigned int *bytes_read_ptr)
17383 int shift, num_read;
17384 unsigned char byte;
17391 byte = bfd_get_8 (abfd, buf);
17394 result |= ((LONGEST) (byte & 127) << shift);
17396 if ((byte & 128) == 0)
17401 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
17402 result |= -(((LONGEST) 1) << shift);
17403 *bytes_read_ptr = num_read;
17407 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
17408 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
17409 ADDR_SIZE is the size of addresses from the CU header. */
17412 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
17414 struct objfile *objfile = dwarf2_per_objfile->objfile;
17415 bfd *abfd = objfile->obfd;
17416 const gdb_byte *info_ptr;
17418 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
17419 if (dwarf2_per_objfile->addr.buffer == NULL)
17420 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
17421 objfile_name (objfile));
17422 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
17423 error (_("DW_FORM_addr_index pointing outside of "
17424 ".debug_addr section [in module %s]"),
17425 objfile_name (objfile));
17426 info_ptr = (dwarf2_per_objfile->addr.buffer
17427 + addr_base + addr_index * addr_size);
17428 if (addr_size == 4)
17429 return bfd_get_32 (abfd, info_ptr);
17431 return bfd_get_64 (abfd, info_ptr);
17434 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
17437 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
17439 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
17442 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
17445 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
17446 unsigned int *bytes_read)
17448 bfd *abfd = cu->objfile->obfd;
17449 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
17451 return read_addr_index (cu, addr_index);
17454 /* Data structure to pass results from dwarf2_read_addr_index_reader
17455 back to dwarf2_read_addr_index. */
17457 struct dwarf2_read_addr_index_data
17459 ULONGEST addr_base;
17463 /* die_reader_func for dwarf2_read_addr_index. */
17466 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
17467 const gdb_byte *info_ptr,
17468 struct die_info *comp_unit_die,
17472 struct dwarf2_cu *cu = reader->cu;
17473 struct dwarf2_read_addr_index_data *aidata =
17474 (struct dwarf2_read_addr_index_data *) data;
17476 aidata->addr_base = cu->addr_base;
17477 aidata->addr_size = cu->header.addr_size;
17480 /* Given an index in .debug_addr, fetch the value.
17481 NOTE: This can be called during dwarf expression evaluation,
17482 long after the debug information has been read, and thus per_cu->cu
17483 may no longer exist. */
17486 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
17487 unsigned int addr_index)
17489 struct objfile *objfile = per_cu->objfile;
17490 struct dwarf2_cu *cu = per_cu->cu;
17491 ULONGEST addr_base;
17494 /* This is intended to be called from outside this file. */
17495 dw2_setup (objfile);
17497 /* We need addr_base and addr_size.
17498 If we don't have PER_CU->cu, we have to get it.
17499 Nasty, but the alternative is storing the needed info in PER_CU,
17500 which at this point doesn't seem justified: it's not clear how frequently
17501 it would get used and it would increase the size of every PER_CU.
17502 Entry points like dwarf2_per_cu_addr_size do a similar thing
17503 so we're not in uncharted territory here.
17504 Alas we need to be a bit more complicated as addr_base is contained
17507 We don't need to read the entire CU(/TU).
17508 We just need the header and top level die.
17510 IWBN to use the aging mechanism to let us lazily later discard the CU.
17511 For now we skip this optimization. */
17515 addr_base = cu->addr_base;
17516 addr_size = cu->header.addr_size;
17520 struct dwarf2_read_addr_index_data aidata;
17522 /* Note: We can't use init_cutu_and_read_dies_simple here,
17523 we need addr_base. */
17524 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
17525 dwarf2_read_addr_index_reader, &aidata);
17526 addr_base = aidata.addr_base;
17527 addr_size = aidata.addr_size;
17530 return read_addr_index_1 (addr_index, addr_base, addr_size);
17533 /* Given a DW_FORM_GNU_str_index, fetch the string.
17534 This is only used by the Fission support. */
17536 static const char *
17537 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
17539 struct objfile *objfile = dwarf2_per_objfile->objfile;
17540 const char *objf_name = objfile_name (objfile);
17541 bfd *abfd = objfile->obfd;
17542 struct dwarf2_cu *cu = reader->cu;
17543 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
17544 struct dwarf2_section_info *str_offsets_section =
17545 &reader->dwo_file->sections.str_offsets;
17546 const gdb_byte *info_ptr;
17547 ULONGEST str_offset;
17548 static const char form_name[] = "DW_FORM_GNU_str_index";
17550 dwarf2_read_section (objfile, str_section);
17551 dwarf2_read_section (objfile, str_offsets_section);
17552 if (str_section->buffer == NULL)
17553 error (_("%s used without .debug_str.dwo section"
17554 " in CU at offset 0x%x [in module %s]"),
17555 form_name, to_underlying (cu->header.sect_off), objf_name);
17556 if (str_offsets_section->buffer == NULL)
17557 error (_("%s used without .debug_str_offsets.dwo section"
17558 " in CU at offset 0x%x [in module %s]"),
17559 form_name, to_underlying (cu->header.sect_off), objf_name);
17560 if (str_index * cu->header.offset_size >= str_offsets_section->size)
17561 error (_("%s pointing outside of .debug_str_offsets.dwo"
17562 " section in CU at offset 0x%x [in module %s]"),
17563 form_name, to_underlying (cu->header.sect_off), objf_name);
17564 info_ptr = (str_offsets_section->buffer
17565 + str_index * cu->header.offset_size);
17566 if (cu->header.offset_size == 4)
17567 str_offset = bfd_get_32 (abfd, info_ptr);
17569 str_offset = bfd_get_64 (abfd, info_ptr);
17570 if (str_offset >= str_section->size)
17571 error (_("Offset from %s pointing outside of"
17572 " .debug_str.dwo section in CU at offset 0x%x [in module %s]"),
17573 form_name, to_underlying (cu->header.sect_off), objf_name);
17574 return (const char *) (str_section->buffer + str_offset);
17577 /* Return the length of an LEB128 number in BUF. */
17580 leb128_size (const gdb_byte *buf)
17582 const gdb_byte *begin = buf;
17588 if ((byte & 128) == 0)
17589 return buf - begin;
17594 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
17603 cu->language = language_c;
17606 case DW_LANG_C_plus_plus:
17607 case DW_LANG_C_plus_plus_11:
17608 case DW_LANG_C_plus_plus_14:
17609 cu->language = language_cplus;
17612 cu->language = language_d;
17614 case DW_LANG_Fortran77:
17615 case DW_LANG_Fortran90:
17616 case DW_LANG_Fortran95:
17617 case DW_LANG_Fortran03:
17618 case DW_LANG_Fortran08:
17619 cu->language = language_fortran;
17622 cu->language = language_go;
17624 case DW_LANG_Mips_Assembler:
17625 cu->language = language_asm;
17627 case DW_LANG_Ada83:
17628 case DW_LANG_Ada95:
17629 cu->language = language_ada;
17631 case DW_LANG_Modula2:
17632 cu->language = language_m2;
17634 case DW_LANG_Pascal83:
17635 cu->language = language_pascal;
17638 cu->language = language_objc;
17641 case DW_LANG_Rust_old:
17642 cu->language = language_rust;
17644 case DW_LANG_Cobol74:
17645 case DW_LANG_Cobol85:
17647 cu->language = language_minimal;
17650 cu->language_defn = language_def (cu->language);
17653 /* Return the named attribute or NULL if not there. */
17655 static struct attribute *
17656 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17661 struct attribute *spec = NULL;
17663 for (i = 0; i < die->num_attrs; ++i)
17665 if (die->attrs[i].name == name)
17666 return &die->attrs[i];
17667 if (die->attrs[i].name == DW_AT_specification
17668 || die->attrs[i].name == DW_AT_abstract_origin)
17669 spec = &die->attrs[i];
17675 die = follow_die_ref (die, spec, &cu);
17681 /* Return the named attribute or NULL if not there,
17682 but do not follow DW_AT_specification, etc.
17683 This is for use in contexts where we're reading .debug_types dies.
17684 Following DW_AT_specification, DW_AT_abstract_origin will take us
17685 back up the chain, and we want to go down. */
17687 static struct attribute *
17688 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
17692 for (i = 0; i < die->num_attrs; ++i)
17693 if (die->attrs[i].name == name)
17694 return &die->attrs[i];
17699 /* Return the string associated with a string-typed attribute, or NULL if it
17700 is either not found or is of an incorrect type. */
17702 static const char *
17703 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
17705 struct attribute *attr;
17706 const char *str = NULL;
17708 attr = dwarf2_attr (die, name, cu);
17712 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
17713 || attr->form == DW_FORM_string
17714 || attr->form == DW_FORM_GNU_str_index
17715 || attr->form == DW_FORM_GNU_strp_alt)
17716 str = DW_STRING (attr);
17718 complaint (&symfile_complaints,
17719 _("string type expected for attribute %s for "
17720 "DIE at 0x%x in module %s"),
17721 dwarf_attr_name (name), to_underlying (die->sect_off),
17722 objfile_name (cu->objfile));
17728 /* Return non-zero iff the attribute NAME is defined for the given DIE,
17729 and holds a non-zero value. This function should only be used for
17730 DW_FORM_flag or DW_FORM_flag_present attributes. */
17733 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
17735 struct attribute *attr = dwarf2_attr (die, name, cu);
17737 return (attr && DW_UNSND (attr));
17741 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
17743 /* A DIE is a declaration if it has a DW_AT_declaration attribute
17744 which value is non-zero. However, we have to be careful with
17745 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
17746 (via dwarf2_flag_true_p) follows this attribute. So we may
17747 end up accidently finding a declaration attribute that belongs
17748 to a different DIE referenced by the specification attribute,
17749 even though the given DIE does not have a declaration attribute. */
17750 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
17751 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
17754 /* Return the die giving the specification for DIE, if there is
17755 one. *SPEC_CU is the CU containing DIE on input, and the CU
17756 containing the return value on output. If there is no
17757 specification, but there is an abstract origin, that is
17760 static struct die_info *
17761 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
17763 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
17766 if (spec_attr == NULL)
17767 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
17769 if (spec_attr == NULL)
17772 return follow_die_ref (die, spec_attr, spec_cu);
17775 /* Stub for free_line_header to match void * callback types. */
17778 free_line_header_voidp (void *arg)
17780 struct line_header *lh = (struct line_header *) arg;
17786 line_header::add_include_dir (const char *include_dir)
17788 if (dwarf_line_debug >= 2)
17789 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
17790 include_dirs.size () + 1, include_dir);
17792 include_dirs.push_back (include_dir);
17796 line_header::add_file_name (const char *name,
17798 unsigned int mod_time,
17799 unsigned int length)
17801 if (dwarf_line_debug >= 2)
17802 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
17803 (unsigned) file_names.size () + 1, name);
17805 file_names.emplace_back (name, d_index, mod_time, length);
17808 /* A convenience function to find the proper .debug_line section for a CU. */
17810 static struct dwarf2_section_info *
17811 get_debug_line_section (struct dwarf2_cu *cu)
17813 struct dwarf2_section_info *section;
17815 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
17817 if (cu->dwo_unit && cu->per_cu->is_debug_types)
17818 section = &cu->dwo_unit->dwo_file->sections.line;
17819 else if (cu->per_cu->is_dwz)
17821 struct dwz_file *dwz = dwarf2_get_dwz_file ();
17823 section = &dwz->line;
17826 section = &dwarf2_per_objfile->line;
17831 /* Read directory or file name entry format, starting with byte of
17832 format count entries, ULEB128 pairs of entry formats, ULEB128 of
17833 entries count and the entries themselves in the described entry
17837 read_formatted_entries (bfd *abfd, const gdb_byte **bufp,
17838 struct line_header *lh,
17839 const struct comp_unit_head *cu_header,
17840 void (*callback) (struct line_header *lh,
17843 unsigned int mod_time,
17844 unsigned int length))
17846 gdb_byte format_count, formati;
17847 ULONGEST data_count, datai;
17848 const gdb_byte *buf = *bufp;
17849 const gdb_byte *format_header_data;
17851 unsigned int bytes_read;
17853 format_count = read_1_byte (abfd, buf);
17855 format_header_data = buf;
17856 for (formati = 0; formati < format_count; formati++)
17858 read_unsigned_leb128 (abfd, buf, &bytes_read);
17860 read_unsigned_leb128 (abfd, buf, &bytes_read);
17864 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
17866 for (datai = 0; datai < data_count; datai++)
17868 const gdb_byte *format = format_header_data;
17869 struct file_entry fe;
17871 for (formati = 0; formati < format_count; formati++)
17873 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
17874 format += bytes_read;
17876 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
17877 format += bytes_read;
17879 gdb::optional<const char *> string;
17880 gdb::optional<unsigned int> uint;
17884 case DW_FORM_string:
17885 string.emplace (read_direct_string (abfd, buf, &bytes_read));
17889 case DW_FORM_line_strp:
17890 string.emplace (read_indirect_line_string (abfd, buf,
17896 case DW_FORM_data1:
17897 uint.emplace (read_1_byte (abfd, buf));
17901 case DW_FORM_data2:
17902 uint.emplace (read_2_bytes (abfd, buf));
17906 case DW_FORM_data4:
17907 uint.emplace (read_4_bytes (abfd, buf));
17911 case DW_FORM_data8:
17912 uint.emplace (read_8_bytes (abfd, buf));
17916 case DW_FORM_udata:
17917 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
17921 case DW_FORM_block:
17922 /* It is valid only for DW_LNCT_timestamp which is ignored by
17927 switch (content_type)
17930 if (string.has_value ())
17933 case DW_LNCT_directory_index:
17934 if (uint.has_value ())
17935 fe.d_index = (dir_index) *uint;
17937 case DW_LNCT_timestamp:
17938 if (uint.has_value ())
17939 fe.mod_time = *uint;
17942 if (uint.has_value ())
17948 complaint (&symfile_complaints,
17949 _("Unknown format content type %s"),
17950 pulongest (content_type));
17954 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
17960 /* Read the statement program header starting at OFFSET in
17961 .debug_line, or .debug_line.dwo. Return a pointer
17962 to a struct line_header, allocated using xmalloc.
17963 Returns NULL if there is a problem reading the header, e.g., if it
17964 has a version we don't understand.
17966 NOTE: the strings in the include directory and file name tables of
17967 the returned object point into the dwarf line section buffer,
17968 and must not be freed. */
17970 static line_header_up
17971 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
17973 const gdb_byte *line_ptr;
17974 unsigned int bytes_read, offset_size;
17976 const char *cur_dir, *cur_file;
17977 struct dwarf2_section_info *section;
17980 section = get_debug_line_section (cu);
17981 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
17982 if (section->buffer == NULL)
17984 if (cu->dwo_unit && cu->per_cu->is_debug_types)
17985 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
17987 complaint (&symfile_complaints, _("missing .debug_line section"));
17991 /* We can't do this until we know the section is non-empty.
17992 Only then do we know we have such a section. */
17993 abfd = get_section_bfd_owner (section);
17995 /* Make sure that at least there's room for the total_length field.
17996 That could be 12 bytes long, but we're just going to fudge that. */
17997 if (to_underlying (sect_off) + 4 >= section->size)
17999 dwarf2_statement_list_fits_in_line_number_section_complaint ();
18003 line_header_up lh (new line_header ());
18005 lh->sect_off = sect_off;
18006 lh->offset_in_dwz = cu->per_cu->is_dwz;
18008 line_ptr = section->buffer + to_underlying (sect_off);
18010 /* Read in the header. */
18012 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
18013 &bytes_read, &offset_size);
18014 line_ptr += bytes_read;
18015 if (line_ptr + lh->total_length > (section->buffer + section->size))
18017 dwarf2_statement_list_fits_in_line_number_section_complaint ();
18020 lh->statement_program_end = line_ptr + lh->total_length;
18021 lh->version = read_2_bytes (abfd, line_ptr);
18023 if (lh->version > 5)
18025 /* This is a version we don't understand. The format could have
18026 changed in ways we don't handle properly so just punt. */
18027 complaint (&symfile_complaints,
18028 _("unsupported version in .debug_line section"));
18031 if (lh->version >= 5)
18033 gdb_byte segment_selector_size;
18035 /* Skip address size. */
18036 read_1_byte (abfd, line_ptr);
18039 segment_selector_size = read_1_byte (abfd, line_ptr);
18041 if (segment_selector_size != 0)
18043 complaint (&symfile_complaints,
18044 _("unsupported segment selector size %u "
18045 "in .debug_line section"),
18046 segment_selector_size);
18050 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
18051 line_ptr += offset_size;
18052 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
18054 if (lh->version >= 4)
18056 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
18060 lh->maximum_ops_per_instruction = 1;
18062 if (lh->maximum_ops_per_instruction == 0)
18064 lh->maximum_ops_per_instruction = 1;
18065 complaint (&symfile_complaints,
18066 _("invalid maximum_ops_per_instruction "
18067 "in `.debug_line' section"));
18070 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
18072 lh->line_base = read_1_signed_byte (abfd, line_ptr);
18074 lh->line_range = read_1_byte (abfd, line_ptr);
18076 lh->opcode_base = read_1_byte (abfd, line_ptr);
18078 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
18080 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
18081 for (i = 1; i < lh->opcode_base; ++i)
18083 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
18087 if (lh->version >= 5)
18089 /* Read directory table. */
18090 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18091 [] (struct line_header *lh, const char *name,
18092 dir_index d_index, unsigned int mod_time,
18093 unsigned int length)
18095 lh->add_include_dir (name);
18098 /* Read file name table. */
18099 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18100 [] (struct line_header *lh, const char *name,
18101 dir_index d_index, unsigned int mod_time,
18102 unsigned int length)
18104 lh->add_file_name (name, d_index, mod_time, length);
18109 /* Read directory table. */
18110 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
18112 line_ptr += bytes_read;
18113 lh->add_include_dir (cur_dir);
18115 line_ptr += bytes_read;
18117 /* Read file name table. */
18118 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
18120 unsigned int mod_time, length;
18123 line_ptr += bytes_read;
18124 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18125 line_ptr += bytes_read;
18126 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18127 line_ptr += bytes_read;
18128 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18129 line_ptr += bytes_read;
18131 lh->add_file_name (cur_file, d_index, mod_time, length);
18133 line_ptr += bytes_read;
18135 lh->statement_program_start = line_ptr;
18137 if (line_ptr > (section->buffer + section->size))
18138 complaint (&symfile_complaints,
18139 _("line number info header doesn't "
18140 "fit in `.debug_line' section"));
18145 /* Subroutine of dwarf_decode_lines to simplify it.
18146 Return the file name of the psymtab for included file FILE_INDEX
18147 in line header LH of PST.
18148 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
18149 If space for the result is malloc'd, it will be freed by a cleanup.
18150 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
18152 The function creates dangling cleanup registration. */
18154 static const char *
18155 psymtab_include_file_name (const struct line_header *lh, int file_index,
18156 const struct partial_symtab *pst,
18157 const char *comp_dir)
18159 const file_entry &fe = lh->file_names[file_index];
18160 const char *include_name = fe.name;
18161 const char *include_name_to_compare = include_name;
18162 const char *pst_filename;
18163 char *copied_name = NULL;
18166 const char *dir_name = fe.include_dir (lh);
18168 if (!IS_ABSOLUTE_PATH (include_name)
18169 && (dir_name != NULL || comp_dir != NULL))
18171 /* Avoid creating a duplicate psymtab for PST.
18172 We do this by comparing INCLUDE_NAME and PST_FILENAME.
18173 Before we do the comparison, however, we need to account
18174 for DIR_NAME and COMP_DIR.
18175 First prepend dir_name (if non-NULL). If we still don't
18176 have an absolute path prepend comp_dir (if non-NULL).
18177 However, the directory we record in the include-file's
18178 psymtab does not contain COMP_DIR (to match the
18179 corresponding symtab(s)).
18184 bash$ gcc -g ./hello.c
18185 include_name = "hello.c"
18187 DW_AT_comp_dir = comp_dir = "/tmp"
18188 DW_AT_name = "./hello.c"
18192 if (dir_name != NULL)
18194 char *tem = concat (dir_name, SLASH_STRING,
18195 include_name, (char *)NULL);
18197 make_cleanup (xfree, tem);
18198 include_name = tem;
18199 include_name_to_compare = include_name;
18201 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
18203 char *tem = concat (comp_dir, SLASH_STRING,
18204 include_name, (char *)NULL);
18206 make_cleanup (xfree, tem);
18207 include_name_to_compare = tem;
18211 pst_filename = pst->filename;
18212 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
18214 copied_name = concat (pst->dirname, SLASH_STRING,
18215 pst_filename, (char *)NULL);
18216 pst_filename = copied_name;
18219 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
18221 if (copied_name != NULL)
18222 xfree (copied_name);
18226 return include_name;
18229 /* State machine to track the state of the line number program. */
18231 class lnp_state_machine
18234 /* Initialize a machine state for the start of a line number
18236 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
18238 file_entry *current_file ()
18240 /* lh->file_names is 0-based, but the file name numbers in the
18241 statement program are 1-based. */
18242 return m_line_header->file_name_at (m_file);
18245 /* Record the line in the state machine. END_SEQUENCE is true if
18246 we're processing the end of a sequence. */
18247 void record_line (bool end_sequence);
18249 /* Check address and if invalid nop-out the rest of the lines in this
18251 void check_line_address (struct dwarf2_cu *cu,
18252 const gdb_byte *line_ptr,
18253 CORE_ADDR lowpc, CORE_ADDR address);
18255 void handle_set_discriminator (unsigned int discriminator)
18257 m_discriminator = discriminator;
18258 m_line_has_non_zero_discriminator |= discriminator != 0;
18261 /* Handle DW_LNE_set_address. */
18262 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
18265 address += baseaddr;
18266 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
18269 /* Handle DW_LNS_advance_pc. */
18270 void handle_advance_pc (CORE_ADDR adjust);
18272 /* Handle a special opcode. */
18273 void handle_special_opcode (unsigned char op_code);
18275 /* Handle DW_LNS_advance_line. */
18276 void handle_advance_line (int line_delta)
18278 advance_line (line_delta);
18281 /* Handle DW_LNS_set_file. */
18282 void handle_set_file (file_name_index file);
18284 /* Handle DW_LNS_negate_stmt. */
18285 void handle_negate_stmt ()
18287 m_is_stmt = !m_is_stmt;
18290 /* Handle DW_LNS_const_add_pc. */
18291 void handle_const_add_pc ();
18293 /* Handle DW_LNS_fixed_advance_pc. */
18294 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
18296 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18300 /* Handle DW_LNS_copy. */
18301 void handle_copy ()
18303 record_line (false);
18304 m_discriminator = 0;
18307 /* Handle DW_LNE_end_sequence. */
18308 void handle_end_sequence ()
18310 m_record_line_callback = ::record_line;
18314 /* Advance the line by LINE_DELTA. */
18315 void advance_line (int line_delta)
18317 m_line += line_delta;
18319 if (line_delta != 0)
18320 m_line_has_non_zero_discriminator = m_discriminator != 0;
18323 gdbarch *m_gdbarch;
18325 /* True if we're recording lines.
18326 Otherwise we're building partial symtabs and are just interested in
18327 finding include files mentioned by the line number program. */
18328 bool m_record_lines_p;
18330 /* The line number header. */
18331 line_header *m_line_header;
18333 /* These are part of the standard DWARF line number state machine,
18334 and initialized according to the DWARF spec. */
18336 unsigned char m_op_index = 0;
18337 /* The line table index (1-based) of the current file. */
18338 file_name_index m_file = (file_name_index) 1;
18339 unsigned int m_line = 1;
18341 /* These are initialized in the constructor. */
18343 CORE_ADDR m_address;
18345 unsigned int m_discriminator;
18347 /* Additional bits of state we need to track. */
18349 /* The last file that we called dwarf2_start_subfile for.
18350 This is only used for TLLs. */
18351 unsigned int m_last_file = 0;
18352 /* The last file a line number was recorded for. */
18353 struct subfile *m_last_subfile = NULL;
18355 /* The function to call to record a line. */
18356 record_line_ftype *m_record_line_callback = NULL;
18358 /* The last line number that was recorded, used to coalesce
18359 consecutive entries for the same line. This can happen, for
18360 example, when discriminators are present. PR 17276. */
18361 unsigned int m_last_line = 0;
18362 bool m_line_has_non_zero_discriminator = false;
18366 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
18368 CORE_ADDR addr_adj = (((m_op_index + adjust)
18369 / m_line_header->maximum_ops_per_instruction)
18370 * m_line_header->minimum_instruction_length);
18371 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18372 m_op_index = ((m_op_index + adjust)
18373 % m_line_header->maximum_ops_per_instruction);
18377 lnp_state_machine::handle_special_opcode (unsigned char op_code)
18379 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
18380 CORE_ADDR addr_adj = (((m_op_index
18381 + (adj_opcode / m_line_header->line_range))
18382 / m_line_header->maximum_ops_per_instruction)
18383 * m_line_header->minimum_instruction_length);
18384 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18385 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
18386 % m_line_header->maximum_ops_per_instruction);
18388 int line_delta = (m_line_header->line_base
18389 + (adj_opcode % m_line_header->line_range));
18390 advance_line (line_delta);
18391 record_line (false);
18392 m_discriminator = 0;
18396 lnp_state_machine::handle_set_file (file_name_index file)
18400 const file_entry *fe = current_file ();
18402 dwarf2_debug_line_missing_file_complaint ();
18403 else if (m_record_lines_p)
18405 const char *dir = fe->include_dir (m_line_header);
18407 m_last_subfile = current_subfile;
18408 m_line_has_non_zero_discriminator = m_discriminator != 0;
18409 dwarf2_start_subfile (fe->name, dir);
18414 lnp_state_machine::handle_const_add_pc ()
18417 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
18420 = (((m_op_index + adjust)
18421 / m_line_header->maximum_ops_per_instruction)
18422 * m_line_header->minimum_instruction_length);
18424 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18425 m_op_index = ((m_op_index + adjust)
18426 % m_line_header->maximum_ops_per_instruction);
18429 /* Ignore this record_line request. */
18432 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
18437 /* Return non-zero if we should add LINE to the line number table.
18438 LINE is the line to add, LAST_LINE is the last line that was added,
18439 LAST_SUBFILE is the subfile for LAST_LINE.
18440 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
18441 had a non-zero discriminator.
18443 We have to be careful in the presence of discriminators.
18444 E.g., for this line:
18446 for (i = 0; i < 100000; i++);
18448 clang can emit four line number entries for that one line,
18449 each with a different discriminator.
18450 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
18452 However, we want gdb to coalesce all four entries into one.
18453 Otherwise the user could stepi into the middle of the line and
18454 gdb would get confused about whether the pc really was in the
18455 middle of the line.
18457 Things are further complicated by the fact that two consecutive
18458 line number entries for the same line is a heuristic used by gcc
18459 to denote the end of the prologue. So we can't just discard duplicate
18460 entries, we have to be selective about it. The heuristic we use is
18461 that we only collapse consecutive entries for the same line if at least
18462 one of those entries has a non-zero discriminator. PR 17276.
18464 Note: Addresses in the line number state machine can never go backwards
18465 within one sequence, thus this coalescing is ok. */
18468 dwarf_record_line_p (unsigned int line, unsigned int last_line,
18469 int line_has_non_zero_discriminator,
18470 struct subfile *last_subfile)
18472 if (current_subfile != last_subfile)
18474 if (line != last_line)
18476 /* Same line for the same file that we've seen already.
18477 As a last check, for pr 17276, only record the line if the line
18478 has never had a non-zero discriminator. */
18479 if (!line_has_non_zero_discriminator)
18484 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
18485 in the line table of subfile SUBFILE. */
18488 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
18489 unsigned int line, CORE_ADDR address,
18490 record_line_ftype p_record_line)
18492 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
18494 if (dwarf_line_debug)
18496 fprintf_unfiltered (gdb_stdlog,
18497 "Recording line %u, file %s, address %s\n",
18498 line, lbasename (subfile->name),
18499 paddress (gdbarch, address));
18502 (*p_record_line) (subfile, line, addr);
18505 /* Subroutine of dwarf_decode_lines_1 to simplify it.
18506 Mark the end of a set of line number records.
18507 The arguments are the same as for dwarf_record_line_1.
18508 If SUBFILE is NULL the request is ignored. */
18511 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
18512 CORE_ADDR address, record_line_ftype p_record_line)
18514 if (subfile == NULL)
18517 if (dwarf_line_debug)
18519 fprintf_unfiltered (gdb_stdlog,
18520 "Finishing current line, file %s, address %s\n",
18521 lbasename (subfile->name),
18522 paddress (gdbarch, address));
18525 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
18529 lnp_state_machine::record_line (bool end_sequence)
18531 if (dwarf_line_debug)
18533 fprintf_unfiltered (gdb_stdlog,
18534 "Processing actual line %u: file %u,"
18535 " address %s, is_stmt %u, discrim %u\n",
18536 m_line, to_underlying (m_file),
18537 paddress (m_gdbarch, m_address),
18538 m_is_stmt, m_discriminator);
18541 file_entry *fe = current_file ();
18544 dwarf2_debug_line_missing_file_complaint ();
18545 /* For now we ignore lines not starting on an instruction boundary.
18546 But not when processing end_sequence for compatibility with the
18547 previous version of the code. */
18548 else if (m_op_index == 0 || end_sequence)
18550 fe->included_p = 1;
18551 if (m_record_lines_p && m_is_stmt)
18553 if (m_last_subfile != current_subfile || end_sequence)
18555 dwarf_finish_line (m_gdbarch, m_last_subfile,
18556 m_address, m_record_line_callback);
18561 if (dwarf_record_line_p (m_line, m_last_line,
18562 m_line_has_non_zero_discriminator,
18565 dwarf_record_line_1 (m_gdbarch, current_subfile,
18567 m_record_line_callback);
18569 m_last_subfile = current_subfile;
18570 m_last_line = m_line;
18576 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
18577 bool record_lines_p)
18580 m_record_lines_p = record_lines_p;
18581 m_line_header = lh;
18583 m_record_line_callback = ::record_line;
18585 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
18586 was a line entry for it so that the backend has a chance to adjust it
18587 and also record it in case it needs it. This is currently used by MIPS
18588 code, cf. `mips_adjust_dwarf2_line'. */
18589 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
18590 m_is_stmt = lh->default_is_stmt;
18591 m_discriminator = 0;
18595 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
18596 const gdb_byte *line_ptr,
18597 CORE_ADDR lowpc, CORE_ADDR address)
18599 /* If address < lowpc then it's not a usable value, it's outside the
18600 pc range of the CU. However, we restrict the test to only address
18601 values of zero to preserve GDB's previous behaviour which is to
18602 handle the specific case of a function being GC'd by the linker. */
18604 if (address == 0 && address < lowpc)
18606 /* This line table is for a function which has been
18607 GCd by the linker. Ignore it. PR gdb/12528 */
18609 struct objfile *objfile = cu->objfile;
18610 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
18612 complaint (&symfile_complaints,
18613 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
18614 line_offset, objfile_name (objfile));
18615 m_record_line_callback = noop_record_line;
18616 /* Note: record_line_callback is left as noop_record_line until
18617 we see DW_LNE_end_sequence. */
18621 /* Subroutine of dwarf_decode_lines to simplify it.
18622 Process the line number information in LH.
18623 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
18624 program in order to set included_p for every referenced header. */
18627 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
18628 const int decode_for_pst_p, CORE_ADDR lowpc)
18630 const gdb_byte *line_ptr, *extended_end;
18631 const gdb_byte *line_end;
18632 unsigned int bytes_read, extended_len;
18633 unsigned char op_code, extended_op;
18634 CORE_ADDR baseaddr;
18635 struct objfile *objfile = cu->objfile;
18636 bfd *abfd = objfile->obfd;
18637 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18638 /* True if we're recording line info (as opposed to building partial
18639 symtabs and just interested in finding include files mentioned by
18640 the line number program). */
18641 bool record_lines_p = !decode_for_pst_p;
18643 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
18645 line_ptr = lh->statement_program_start;
18646 line_end = lh->statement_program_end;
18648 /* Read the statement sequences until there's nothing left. */
18649 while (line_ptr < line_end)
18651 /* The DWARF line number program state machine. Reset the state
18652 machine at the start of each sequence. */
18653 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
18654 bool end_sequence = false;
18656 if (record_lines_p)
18658 /* Start a subfile for the current file of the state
18660 const file_entry *fe = state_machine.current_file ();
18663 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
18666 /* Decode the table. */
18667 while (line_ptr < line_end && !end_sequence)
18669 op_code = read_1_byte (abfd, line_ptr);
18672 if (op_code >= lh->opcode_base)
18674 /* Special opcode. */
18675 state_machine.handle_special_opcode (op_code);
18677 else switch (op_code)
18679 case DW_LNS_extended_op:
18680 extended_len = read_unsigned_leb128 (abfd, line_ptr,
18682 line_ptr += bytes_read;
18683 extended_end = line_ptr + extended_len;
18684 extended_op = read_1_byte (abfd, line_ptr);
18686 switch (extended_op)
18688 case DW_LNE_end_sequence:
18689 state_machine.handle_end_sequence ();
18690 end_sequence = true;
18692 case DW_LNE_set_address:
18695 = read_address (abfd, line_ptr, cu, &bytes_read);
18696 line_ptr += bytes_read;
18698 state_machine.check_line_address (cu, line_ptr,
18700 state_machine.handle_set_address (baseaddr, address);
18703 case DW_LNE_define_file:
18705 const char *cur_file;
18706 unsigned int mod_time, length;
18709 cur_file = read_direct_string (abfd, line_ptr,
18711 line_ptr += bytes_read;
18712 dindex = (dir_index)
18713 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18714 line_ptr += bytes_read;
18716 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18717 line_ptr += bytes_read;
18719 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18720 line_ptr += bytes_read;
18721 lh->add_file_name (cur_file, dindex, mod_time, length);
18724 case DW_LNE_set_discriminator:
18726 /* The discriminator is not interesting to the
18727 debugger; just ignore it. We still need to
18728 check its value though:
18729 if there are consecutive entries for the same
18730 (non-prologue) line we want to coalesce them.
18733 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18734 line_ptr += bytes_read;
18736 state_machine.handle_set_discriminator (discr);
18740 complaint (&symfile_complaints,
18741 _("mangled .debug_line section"));
18744 /* Make sure that we parsed the extended op correctly. If e.g.
18745 we expected a different address size than the producer used,
18746 we may have read the wrong number of bytes. */
18747 if (line_ptr != extended_end)
18749 complaint (&symfile_complaints,
18750 _("mangled .debug_line section"));
18755 state_machine.handle_copy ();
18757 case DW_LNS_advance_pc:
18760 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18761 line_ptr += bytes_read;
18763 state_machine.handle_advance_pc (adjust);
18766 case DW_LNS_advance_line:
18769 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
18770 line_ptr += bytes_read;
18772 state_machine.handle_advance_line (line_delta);
18775 case DW_LNS_set_file:
18777 file_name_index file
18778 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
18780 line_ptr += bytes_read;
18782 state_machine.handle_set_file (file);
18785 case DW_LNS_set_column:
18786 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18787 line_ptr += bytes_read;
18789 case DW_LNS_negate_stmt:
18790 state_machine.handle_negate_stmt ();
18792 case DW_LNS_set_basic_block:
18794 /* Add to the address register of the state machine the
18795 address increment value corresponding to special opcode
18796 255. I.e., this value is scaled by the minimum
18797 instruction length since special opcode 255 would have
18798 scaled the increment. */
18799 case DW_LNS_const_add_pc:
18800 state_machine.handle_const_add_pc ();
18802 case DW_LNS_fixed_advance_pc:
18804 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
18807 state_machine.handle_fixed_advance_pc (addr_adj);
18812 /* Unknown standard opcode, ignore it. */
18815 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
18817 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18818 line_ptr += bytes_read;
18825 dwarf2_debug_line_missing_end_sequence_complaint ();
18827 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
18828 in which case we still finish recording the last line). */
18829 state_machine.record_line (true);
18833 /* Decode the Line Number Program (LNP) for the given line_header
18834 structure and CU. The actual information extracted and the type
18835 of structures created from the LNP depends on the value of PST.
18837 1. If PST is NULL, then this procedure uses the data from the program
18838 to create all necessary symbol tables, and their linetables.
18840 2. If PST is not NULL, this procedure reads the program to determine
18841 the list of files included by the unit represented by PST, and
18842 builds all the associated partial symbol tables.
18844 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
18845 It is used for relative paths in the line table.
18846 NOTE: When processing partial symtabs (pst != NULL),
18847 comp_dir == pst->dirname.
18849 NOTE: It is important that psymtabs have the same file name (via strcmp)
18850 as the corresponding symtab. Since COMP_DIR is not used in the name of the
18851 symtab we don't use it in the name of the psymtabs we create.
18852 E.g. expand_line_sal requires this when finding psymtabs to expand.
18853 A good testcase for this is mb-inline.exp.
18855 LOWPC is the lowest address in CU (or 0 if not known).
18857 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
18858 for its PC<->lines mapping information. Otherwise only the filename
18859 table is read in. */
18862 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
18863 struct dwarf2_cu *cu, struct partial_symtab *pst,
18864 CORE_ADDR lowpc, int decode_mapping)
18866 struct objfile *objfile = cu->objfile;
18867 const int decode_for_pst_p = (pst != NULL);
18869 if (decode_mapping)
18870 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
18872 if (decode_for_pst_p)
18876 /* Now that we're done scanning the Line Header Program, we can
18877 create the psymtab of each included file. */
18878 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
18879 if (lh->file_names[file_index].included_p == 1)
18881 const char *include_name =
18882 psymtab_include_file_name (lh, file_index, pst, comp_dir);
18883 if (include_name != NULL)
18884 dwarf2_create_include_psymtab (include_name, pst, objfile);
18889 /* Make sure a symtab is created for every file, even files
18890 which contain only variables (i.e. no code with associated
18892 struct compunit_symtab *cust = buildsym_compunit_symtab ();
18895 for (i = 0; i < lh->file_names.size (); i++)
18897 file_entry &fe = lh->file_names[i];
18899 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
18901 if (current_subfile->symtab == NULL)
18903 current_subfile->symtab
18904 = allocate_symtab (cust, current_subfile->name);
18906 fe.symtab = current_subfile->symtab;
18911 /* Start a subfile for DWARF. FILENAME is the name of the file and
18912 DIRNAME the name of the source directory which contains FILENAME
18913 or NULL if not known.
18914 This routine tries to keep line numbers from identical absolute and
18915 relative file names in a common subfile.
18917 Using the `list' example from the GDB testsuite, which resides in
18918 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
18919 of /srcdir/list0.c yields the following debugging information for list0.c:
18921 DW_AT_name: /srcdir/list0.c
18922 DW_AT_comp_dir: /compdir
18923 files.files[0].name: list0.h
18924 files.files[0].dir: /srcdir
18925 files.files[1].name: list0.c
18926 files.files[1].dir: /srcdir
18928 The line number information for list0.c has to end up in a single
18929 subfile, so that `break /srcdir/list0.c:1' works as expected.
18930 start_subfile will ensure that this happens provided that we pass the
18931 concatenation of files.files[1].dir and files.files[1].name as the
18935 dwarf2_start_subfile (const char *filename, const char *dirname)
18939 /* In order not to lose the line information directory,
18940 we concatenate it to the filename when it makes sense.
18941 Note that the Dwarf3 standard says (speaking of filenames in line
18942 information): ``The directory index is ignored for file names
18943 that represent full path names''. Thus ignoring dirname in the
18944 `else' branch below isn't an issue. */
18946 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
18948 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
18952 start_subfile (filename);
18958 /* Start a symtab for DWARF.
18959 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
18961 static struct compunit_symtab *
18962 dwarf2_start_symtab (struct dwarf2_cu *cu,
18963 const char *name, const char *comp_dir, CORE_ADDR low_pc)
18965 struct compunit_symtab *cust
18966 = start_symtab (cu->objfile, name, comp_dir, low_pc);
18968 record_debugformat ("DWARF 2");
18969 record_producer (cu->producer);
18971 /* We assume that we're processing GCC output. */
18972 processing_gcc_compilation = 2;
18974 cu->processing_has_namespace_info = 0;
18980 var_decode_location (struct attribute *attr, struct symbol *sym,
18981 struct dwarf2_cu *cu)
18983 struct objfile *objfile = cu->objfile;
18984 struct comp_unit_head *cu_header = &cu->header;
18986 /* NOTE drow/2003-01-30: There used to be a comment and some special
18987 code here to turn a symbol with DW_AT_external and a
18988 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
18989 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
18990 with some versions of binutils) where shared libraries could have
18991 relocations against symbols in their debug information - the
18992 minimal symbol would have the right address, but the debug info
18993 would not. It's no longer necessary, because we will explicitly
18994 apply relocations when we read in the debug information now. */
18996 /* A DW_AT_location attribute with no contents indicates that a
18997 variable has been optimized away. */
18998 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
19000 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
19004 /* Handle one degenerate form of location expression specially, to
19005 preserve GDB's previous behavior when section offsets are
19006 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
19007 then mark this symbol as LOC_STATIC. */
19009 if (attr_form_is_block (attr)
19010 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
19011 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
19012 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
19013 && (DW_BLOCK (attr)->size
19014 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
19016 unsigned int dummy;
19018 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
19019 SYMBOL_VALUE_ADDRESS (sym) =
19020 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
19022 SYMBOL_VALUE_ADDRESS (sym) =
19023 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
19024 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
19025 fixup_symbol_section (sym, objfile);
19026 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
19027 SYMBOL_SECTION (sym));
19031 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
19032 expression evaluator, and use LOC_COMPUTED only when necessary
19033 (i.e. when the value of a register or memory location is
19034 referenced, or a thread-local block, etc.). Then again, it might
19035 not be worthwhile. I'm assuming that it isn't unless performance
19036 or memory numbers show me otherwise. */
19038 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
19040 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
19041 cu->has_loclist = 1;
19044 /* Given a pointer to a DWARF information entry, figure out if we need
19045 to make a symbol table entry for it, and if so, create a new entry
19046 and return a pointer to it.
19047 If TYPE is NULL, determine symbol type from the die, otherwise
19048 used the passed type.
19049 If SPACE is not NULL, use it to hold the new symbol. If it is
19050 NULL, allocate a new symbol on the objfile's obstack. */
19052 static struct symbol *
19053 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
19054 struct symbol *space)
19056 struct objfile *objfile = cu->objfile;
19057 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19058 struct symbol *sym = NULL;
19060 struct attribute *attr = NULL;
19061 struct attribute *attr2 = NULL;
19062 CORE_ADDR baseaddr;
19063 struct pending **list_to_add = NULL;
19065 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
19067 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
19069 name = dwarf2_name (die, cu);
19072 const char *linkagename;
19073 int suppress_add = 0;
19078 sym = allocate_symbol (objfile);
19079 OBJSTAT (objfile, n_syms++);
19081 /* Cache this symbol's name and the name's demangled form (if any). */
19082 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
19083 linkagename = dwarf2_physname (name, die, cu);
19084 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
19086 /* Fortran does not have mangling standard and the mangling does differ
19087 between gfortran, iFort etc. */
19088 if (cu->language == language_fortran
19089 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
19090 symbol_set_demangled_name (&(sym->ginfo),
19091 dwarf2_full_name (name, die, cu),
19094 /* Default assumptions.
19095 Use the passed type or decode it from the die. */
19096 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19097 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
19099 SYMBOL_TYPE (sym) = type;
19101 SYMBOL_TYPE (sym) = die_type (die, cu);
19102 attr = dwarf2_attr (die,
19103 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
19107 SYMBOL_LINE (sym) = DW_UNSND (attr);
19110 attr = dwarf2_attr (die,
19111 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
19115 file_name_index file_index = (file_name_index) DW_UNSND (attr);
19116 struct file_entry *fe;
19118 if (cu->line_header != NULL)
19119 fe = cu->line_header->file_name_at (file_index);
19124 complaint (&symfile_complaints,
19125 _("file index out of range"));
19127 symbol_set_symtab (sym, fe->symtab);
19133 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
19138 addr = attr_value_as_address (attr);
19139 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
19140 SYMBOL_VALUE_ADDRESS (sym) = addr;
19142 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
19143 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
19144 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
19145 add_symbol_to_list (sym, cu->list_in_scope);
19147 case DW_TAG_subprogram:
19148 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
19150 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
19151 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19152 if ((attr2 && (DW_UNSND (attr2) != 0))
19153 || cu->language == language_ada)
19155 /* Subprograms marked external are stored as a global symbol.
19156 Ada subprograms, whether marked external or not, are always
19157 stored as a global symbol, because we want to be able to
19158 access them globally. For instance, we want to be able
19159 to break on a nested subprogram without having to
19160 specify the context. */
19161 list_to_add = &global_symbols;
19165 list_to_add = cu->list_in_scope;
19168 case DW_TAG_inlined_subroutine:
19169 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
19171 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
19172 SYMBOL_INLINED (sym) = 1;
19173 list_to_add = cu->list_in_scope;
19175 case DW_TAG_template_value_param:
19177 /* Fall through. */
19178 case DW_TAG_constant:
19179 case DW_TAG_variable:
19180 case DW_TAG_member:
19181 /* Compilation with minimal debug info may result in
19182 variables with missing type entries. Change the
19183 misleading `void' type to something sensible. */
19184 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
19185 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
19187 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19188 /* In the case of DW_TAG_member, we should only be called for
19189 static const members. */
19190 if (die->tag == DW_TAG_member)
19192 /* dwarf2_add_field uses die_is_declaration,
19193 so we do the same. */
19194 gdb_assert (die_is_declaration (die, cu));
19199 dwarf2_const_value (attr, sym, cu);
19200 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19203 if (attr2 && (DW_UNSND (attr2) != 0))
19204 list_to_add = &global_symbols;
19206 list_to_add = cu->list_in_scope;
19210 attr = dwarf2_attr (die, DW_AT_location, cu);
19213 var_decode_location (attr, sym, cu);
19214 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19216 /* Fortran explicitly imports any global symbols to the local
19217 scope by DW_TAG_common_block. */
19218 if (cu->language == language_fortran && die->parent
19219 && die->parent->tag == DW_TAG_common_block)
19222 if (SYMBOL_CLASS (sym) == LOC_STATIC
19223 && SYMBOL_VALUE_ADDRESS (sym) == 0
19224 && !dwarf2_per_objfile->has_section_at_zero)
19226 /* When a static variable is eliminated by the linker,
19227 the corresponding debug information is not stripped
19228 out, but the variable address is set to null;
19229 do not add such variables into symbol table. */
19231 else if (attr2 && (DW_UNSND (attr2) != 0))
19233 /* Workaround gfortran PR debug/40040 - it uses
19234 DW_AT_location for variables in -fPIC libraries which may
19235 get overriden by other libraries/executable and get
19236 a different address. Resolve it by the minimal symbol
19237 which may come from inferior's executable using copy
19238 relocation. Make this workaround only for gfortran as for
19239 other compilers GDB cannot guess the minimal symbol
19240 Fortran mangling kind. */
19241 if (cu->language == language_fortran && die->parent
19242 && die->parent->tag == DW_TAG_module
19244 && startswith (cu->producer, "GNU Fortran"))
19245 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19247 /* A variable with DW_AT_external is never static,
19248 but it may be block-scoped. */
19249 list_to_add = (cu->list_in_scope == &file_symbols
19250 ? &global_symbols : cu->list_in_scope);
19253 list_to_add = cu->list_in_scope;
19257 /* We do not know the address of this symbol.
19258 If it is an external symbol and we have type information
19259 for it, enter the symbol as a LOC_UNRESOLVED symbol.
19260 The address of the variable will then be determined from
19261 the minimal symbol table whenever the variable is
19263 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19265 /* Fortran explicitly imports any global symbols to the local
19266 scope by DW_TAG_common_block. */
19267 if (cu->language == language_fortran && die->parent
19268 && die->parent->tag == DW_TAG_common_block)
19270 /* SYMBOL_CLASS doesn't matter here because
19271 read_common_block is going to reset it. */
19273 list_to_add = cu->list_in_scope;
19275 else if (attr2 && (DW_UNSND (attr2) != 0)
19276 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
19278 /* A variable with DW_AT_external is never static, but it
19279 may be block-scoped. */
19280 list_to_add = (cu->list_in_scope == &file_symbols
19281 ? &global_symbols : cu->list_in_scope);
19283 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19285 else if (!die_is_declaration (die, cu))
19287 /* Use the default LOC_OPTIMIZED_OUT class. */
19288 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
19290 list_to_add = cu->list_in_scope;
19294 case DW_TAG_formal_parameter:
19295 /* If we are inside a function, mark this as an argument. If
19296 not, we might be looking at an argument to an inlined function
19297 when we do not have enough information to show inlined frames;
19298 pretend it's a local variable in that case so that the user can
19300 if (context_stack_depth > 0
19301 && context_stack[context_stack_depth - 1].name != NULL)
19302 SYMBOL_IS_ARGUMENT (sym) = 1;
19303 attr = dwarf2_attr (die, DW_AT_location, cu);
19306 var_decode_location (attr, sym, cu);
19308 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19311 dwarf2_const_value (attr, sym, cu);
19314 list_to_add = cu->list_in_scope;
19316 case DW_TAG_unspecified_parameters:
19317 /* From varargs functions; gdb doesn't seem to have any
19318 interest in this information, so just ignore it for now.
19321 case DW_TAG_template_type_param:
19323 /* Fall through. */
19324 case DW_TAG_class_type:
19325 case DW_TAG_interface_type:
19326 case DW_TAG_structure_type:
19327 case DW_TAG_union_type:
19328 case DW_TAG_set_type:
19329 case DW_TAG_enumeration_type:
19330 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19331 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
19334 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
19335 really ever be static objects: otherwise, if you try
19336 to, say, break of a class's method and you're in a file
19337 which doesn't mention that class, it won't work unless
19338 the check for all static symbols in lookup_symbol_aux
19339 saves you. See the OtherFileClass tests in
19340 gdb.c++/namespace.exp. */
19344 list_to_add = (cu->list_in_scope == &file_symbols
19345 && cu->language == language_cplus
19346 ? &global_symbols : cu->list_in_scope);
19348 /* The semantics of C++ state that "struct foo {
19349 ... }" also defines a typedef for "foo". */
19350 if (cu->language == language_cplus
19351 || cu->language == language_ada
19352 || cu->language == language_d
19353 || cu->language == language_rust)
19355 /* The symbol's name is already allocated along
19356 with this objfile, so we don't need to
19357 duplicate it for the type. */
19358 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
19359 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
19364 case DW_TAG_typedef:
19365 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19366 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19367 list_to_add = cu->list_in_scope;
19369 case DW_TAG_base_type:
19370 case DW_TAG_subrange_type:
19371 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19372 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19373 list_to_add = cu->list_in_scope;
19375 case DW_TAG_enumerator:
19376 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19379 dwarf2_const_value (attr, sym, cu);
19382 /* NOTE: carlton/2003-11-10: See comment above in the
19383 DW_TAG_class_type, etc. block. */
19385 list_to_add = (cu->list_in_scope == &file_symbols
19386 && cu->language == language_cplus
19387 ? &global_symbols : cu->list_in_scope);
19390 case DW_TAG_imported_declaration:
19391 case DW_TAG_namespace:
19392 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19393 list_to_add = &global_symbols;
19395 case DW_TAG_module:
19396 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19397 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
19398 list_to_add = &global_symbols;
19400 case DW_TAG_common_block:
19401 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
19402 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
19403 add_symbol_to_list (sym, cu->list_in_scope);
19406 /* Not a tag we recognize. Hopefully we aren't processing
19407 trash data, but since we must specifically ignore things
19408 we don't recognize, there is nothing else we should do at
19410 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
19411 dwarf_tag_name (die->tag));
19417 sym->hash_next = objfile->template_symbols;
19418 objfile->template_symbols = sym;
19419 list_to_add = NULL;
19422 if (list_to_add != NULL)
19423 add_symbol_to_list (sym, list_to_add);
19425 /* For the benefit of old versions of GCC, check for anonymous
19426 namespaces based on the demangled name. */
19427 if (!cu->processing_has_namespace_info
19428 && cu->language == language_cplus)
19429 cp_scan_for_anonymous_namespaces (sym, objfile);
19434 /* A wrapper for new_symbol_full that always allocates a new symbol. */
19436 static struct symbol *
19437 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
19439 return new_symbol_full (die, type, cu, NULL);
19442 /* Given an attr with a DW_FORM_dataN value in host byte order,
19443 zero-extend it as appropriate for the symbol's type. The DWARF
19444 standard (v4) is not entirely clear about the meaning of using
19445 DW_FORM_dataN for a constant with a signed type, where the type is
19446 wider than the data. The conclusion of a discussion on the DWARF
19447 list was that this is unspecified. We choose to always zero-extend
19448 because that is the interpretation long in use by GCC. */
19451 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
19452 struct dwarf2_cu *cu, LONGEST *value, int bits)
19454 struct objfile *objfile = cu->objfile;
19455 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
19456 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
19457 LONGEST l = DW_UNSND (attr);
19459 if (bits < sizeof (*value) * 8)
19461 l &= ((LONGEST) 1 << bits) - 1;
19464 else if (bits == sizeof (*value) * 8)
19468 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
19469 store_unsigned_integer (bytes, bits / 8, byte_order, l);
19476 /* Read a constant value from an attribute. Either set *VALUE, or if
19477 the value does not fit in *VALUE, set *BYTES - either already
19478 allocated on the objfile obstack, or newly allocated on OBSTACK,
19479 or, set *BATON, if we translated the constant to a location
19483 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
19484 const char *name, struct obstack *obstack,
19485 struct dwarf2_cu *cu,
19486 LONGEST *value, const gdb_byte **bytes,
19487 struct dwarf2_locexpr_baton **baton)
19489 struct objfile *objfile = cu->objfile;
19490 struct comp_unit_head *cu_header = &cu->header;
19491 struct dwarf_block *blk;
19492 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
19493 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
19499 switch (attr->form)
19502 case DW_FORM_GNU_addr_index:
19506 if (TYPE_LENGTH (type) != cu_header->addr_size)
19507 dwarf2_const_value_length_mismatch_complaint (name,
19508 cu_header->addr_size,
19509 TYPE_LENGTH (type));
19510 /* Symbols of this form are reasonably rare, so we just
19511 piggyback on the existing location code rather than writing
19512 a new implementation of symbol_computed_ops. */
19513 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
19514 (*baton)->per_cu = cu->per_cu;
19515 gdb_assert ((*baton)->per_cu);
19517 (*baton)->size = 2 + cu_header->addr_size;
19518 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
19519 (*baton)->data = data;
19521 data[0] = DW_OP_addr;
19522 store_unsigned_integer (&data[1], cu_header->addr_size,
19523 byte_order, DW_ADDR (attr));
19524 data[cu_header->addr_size + 1] = DW_OP_stack_value;
19527 case DW_FORM_string:
19529 case DW_FORM_GNU_str_index:
19530 case DW_FORM_GNU_strp_alt:
19531 /* DW_STRING is already allocated on the objfile obstack, point
19533 *bytes = (const gdb_byte *) DW_STRING (attr);
19535 case DW_FORM_block1:
19536 case DW_FORM_block2:
19537 case DW_FORM_block4:
19538 case DW_FORM_block:
19539 case DW_FORM_exprloc:
19540 case DW_FORM_data16:
19541 blk = DW_BLOCK (attr);
19542 if (TYPE_LENGTH (type) != blk->size)
19543 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
19544 TYPE_LENGTH (type));
19545 *bytes = blk->data;
19548 /* The DW_AT_const_value attributes are supposed to carry the
19549 symbol's value "represented as it would be on the target
19550 architecture." By the time we get here, it's already been
19551 converted to host endianness, so we just need to sign- or
19552 zero-extend it as appropriate. */
19553 case DW_FORM_data1:
19554 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
19556 case DW_FORM_data2:
19557 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
19559 case DW_FORM_data4:
19560 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
19562 case DW_FORM_data8:
19563 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
19566 case DW_FORM_sdata:
19567 case DW_FORM_implicit_const:
19568 *value = DW_SND (attr);
19571 case DW_FORM_udata:
19572 *value = DW_UNSND (attr);
19576 complaint (&symfile_complaints,
19577 _("unsupported const value attribute form: '%s'"),
19578 dwarf_form_name (attr->form));
19585 /* Copy constant value from an attribute to a symbol. */
19588 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
19589 struct dwarf2_cu *cu)
19591 struct objfile *objfile = cu->objfile;
19593 const gdb_byte *bytes;
19594 struct dwarf2_locexpr_baton *baton;
19596 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
19597 SYMBOL_PRINT_NAME (sym),
19598 &objfile->objfile_obstack, cu,
19599 &value, &bytes, &baton);
19603 SYMBOL_LOCATION_BATON (sym) = baton;
19604 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
19606 else if (bytes != NULL)
19608 SYMBOL_VALUE_BYTES (sym) = bytes;
19609 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
19613 SYMBOL_VALUE (sym) = value;
19614 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
19618 /* Return the type of the die in question using its DW_AT_type attribute. */
19620 static struct type *
19621 die_type (struct die_info *die, struct dwarf2_cu *cu)
19623 struct attribute *type_attr;
19625 type_attr = dwarf2_attr (die, DW_AT_type, cu);
19628 /* A missing DW_AT_type represents a void type. */
19629 return objfile_type (cu->objfile)->builtin_void;
19632 return lookup_die_type (die, type_attr, cu);
19635 /* True iff CU's producer generates GNAT Ada auxiliary information
19636 that allows to find parallel types through that information instead
19637 of having to do expensive parallel lookups by type name. */
19640 need_gnat_info (struct dwarf2_cu *cu)
19642 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
19643 of GNAT produces this auxiliary information, without any indication
19644 that it is produced. Part of enhancing the FSF version of GNAT
19645 to produce that information will be to put in place an indicator
19646 that we can use in order to determine whether the descriptive type
19647 info is available or not. One suggestion that has been made is
19648 to use a new attribute, attached to the CU die. For now, assume
19649 that the descriptive type info is not available. */
19653 /* Return the auxiliary type of the die in question using its
19654 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
19655 attribute is not present. */
19657 static struct type *
19658 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
19660 struct attribute *type_attr;
19662 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
19666 return lookup_die_type (die, type_attr, cu);
19669 /* If DIE has a descriptive_type attribute, then set the TYPE's
19670 descriptive type accordingly. */
19673 set_descriptive_type (struct type *type, struct die_info *die,
19674 struct dwarf2_cu *cu)
19676 struct type *descriptive_type = die_descriptive_type (die, cu);
19678 if (descriptive_type)
19680 ALLOCATE_GNAT_AUX_TYPE (type);
19681 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
19685 /* Return the containing type of the die in question using its
19686 DW_AT_containing_type attribute. */
19688 static struct type *
19689 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
19691 struct attribute *type_attr;
19693 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
19695 error (_("Dwarf Error: Problem turning containing type into gdb type "
19696 "[in module %s]"), objfile_name (cu->objfile));
19698 return lookup_die_type (die, type_attr, cu);
19701 /* Return an error marker type to use for the ill formed type in DIE/CU. */
19703 static struct type *
19704 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
19706 struct objfile *objfile = dwarf2_per_objfile->objfile;
19707 char *message, *saved;
19709 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
19710 objfile_name (objfile),
19711 to_underlying (cu->header.sect_off),
19712 to_underlying (die->sect_off));
19713 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
19714 message, strlen (message));
19717 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
19720 /* Look up the type of DIE in CU using its type attribute ATTR.
19721 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
19722 DW_AT_containing_type.
19723 If there is no type substitute an error marker. */
19725 static struct type *
19726 lookup_die_type (struct die_info *die, const struct attribute *attr,
19727 struct dwarf2_cu *cu)
19729 struct objfile *objfile = cu->objfile;
19730 struct type *this_type;
19732 gdb_assert (attr->name == DW_AT_type
19733 || attr->name == DW_AT_GNAT_descriptive_type
19734 || attr->name == DW_AT_containing_type);
19736 /* First see if we have it cached. */
19738 if (attr->form == DW_FORM_GNU_ref_alt)
19740 struct dwarf2_per_cu_data *per_cu;
19741 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
19743 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1, cu->objfile);
19744 this_type = get_die_type_at_offset (sect_off, per_cu);
19746 else if (attr_form_is_ref (attr))
19748 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
19750 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
19752 else if (attr->form == DW_FORM_ref_sig8)
19754 ULONGEST signature = DW_SIGNATURE (attr);
19756 return get_signatured_type (die, signature, cu);
19760 complaint (&symfile_complaints,
19761 _("Dwarf Error: Bad type attribute %s in DIE"
19762 " at 0x%x [in module %s]"),
19763 dwarf_attr_name (attr->name), to_underlying (die->sect_off),
19764 objfile_name (objfile));
19765 return build_error_marker_type (cu, die);
19768 /* If not cached we need to read it in. */
19770 if (this_type == NULL)
19772 struct die_info *type_die = NULL;
19773 struct dwarf2_cu *type_cu = cu;
19775 if (attr_form_is_ref (attr))
19776 type_die = follow_die_ref (die, attr, &type_cu);
19777 if (type_die == NULL)
19778 return build_error_marker_type (cu, die);
19779 /* If we find the type now, it's probably because the type came
19780 from an inter-CU reference and the type's CU got expanded before
19782 this_type = read_type_die (type_die, type_cu);
19785 /* If we still don't have a type use an error marker. */
19787 if (this_type == NULL)
19788 return build_error_marker_type (cu, die);
19793 /* Return the type in DIE, CU.
19794 Returns NULL for invalid types.
19796 This first does a lookup in die_type_hash,
19797 and only reads the die in if necessary.
19799 NOTE: This can be called when reading in partial or full symbols. */
19801 static struct type *
19802 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
19804 struct type *this_type;
19806 this_type = get_die_type (die, cu);
19810 return read_type_die_1 (die, cu);
19813 /* Read the type in DIE, CU.
19814 Returns NULL for invalid types. */
19816 static struct type *
19817 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
19819 struct type *this_type = NULL;
19823 case DW_TAG_class_type:
19824 case DW_TAG_interface_type:
19825 case DW_TAG_structure_type:
19826 case DW_TAG_union_type:
19827 this_type = read_structure_type (die, cu);
19829 case DW_TAG_enumeration_type:
19830 this_type = read_enumeration_type (die, cu);
19832 case DW_TAG_subprogram:
19833 case DW_TAG_subroutine_type:
19834 case DW_TAG_inlined_subroutine:
19835 this_type = read_subroutine_type (die, cu);
19837 case DW_TAG_array_type:
19838 this_type = read_array_type (die, cu);
19840 case DW_TAG_set_type:
19841 this_type = read_set_type (die, cu);
19843 case DW_TAG_pointer_type:
19844 this_type = read_tag_pointer_type (die, cu);
19846 case DW_TAG_ptr_to_member_type:
19847 this_type = read_tag_ptr_to_member_type (die, cu);
19849 case DW_TAG_reference_type:
19850 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
19852 case DW_TAG_rvalue_reference_type:
19853 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
19855 case DW_TAG_const_type:
19856 this_type = read_tag_const_type (die, cu);
19858 case DW_TAG_volatile_type:
19859 this_type = read_tag_volatile_type (die, cu);
19861 case DW_TAG_restrict_type:
19862 this_type = read_tag_restrict_type (die, cu);
19864 case DW_TAG_string_type:
19865 this_type = read_tag_string_type (die, cu);
19867 case DW_TAG_typedef:
19868 this_type = read_typedef (die, cu);
19870 case DW_TAG_subrange_type:
19871 this_type = read_subrange_type (die, cu);
19873 case DW_TAG_base_type:
19874 this_type = read_base_type (die, cu);
19876 case DW_TAG_unspecified_type:
19877 this_type = read_unspecified_type (die, cu);
19879 case DW_TAG_namespace:
19880 this_type = read_namespace_type (die, cu);
19882 case DW_TAG_module:
19883 this_type = read_module_type (die, cu);
19885 case DW_TAG_atomic_type:
19886 this_type = read_tag_atomic_type (die, cu);
19889 complaint (&symfile_complaints,
19890 _("unexpected tag in read_type_die: '%s'"),
19891 dwarf_tag_name (die->tag));
19898 /* See if we can figure out if the class lives in a namespace. We do
19899 this by looking for a member function; its demangled name will
19900 contain namespace info, if there is any.
19901 Return the computed name or NULL.
19902 Space for the result is allocated on the objfile's obstack.
19903 This is the full-die version of guess_partial_die_structure_name.
19904 In this case we know DIE has no useful parent. */
19907 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
19909 struct die_info *spec_die;
19910 struct dwarf2_cu *spec_cu;
19911 struct die_info *child;
19914 spec_die = die_specification (die, &spec_cu);
19915 if (spec_die != NULL)
19921 for (child = die->child;
19923 child = child->sibling)
19925 if (child->tag == DW_TAG_subprogram)
19927 const char *linkage_name;
19929 linkage_name = dwarf2_string_attr (child, DW_AT_linkage_name, cu);
19930 if (linkage_name == NULL)
19931 linkage_name = dwarf2_string_attr (child, DW_AT_MIPS_linkage_name,
19933 if (linkage_name != NULL)
19936 = language_class_name_from_physname (cu->language_defn,
19940 if (actual_name != NULL)
19942 const char *die_name = dwarf2_name (die, cu);
19944 if (die_name != NULL
19945 && strcmp (die_name, actual_name) != 0)
19947 /* Strip off the class name from the full name.
19948 We want the prefix. */
19949 int die_name_len = strlen (die_name);
19950 int actual_name_len = strlen (actual_name);
19952 /* Test for '::' as a sanity check. */
19953 if (actual_name_len > die_name_len + 2
19954 && actual_name[actual_name_len
19955 - die_name_len - 1] == ':')
19956 name = (char *) obstack_copy0 (
19957 &cu->objfile->per_bfd->storage_obstack,
19958 actual_name, actual_name_len - die_name_len - 2);
19961 xfree (actual_name);
19970 /* GCC might emit a nameless typedef that has a linkage name. Determine the
19971 prefix part in such case. See
19972 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19974 static const char *
19975 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
19977 struct attribute *attr;
19980 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
19981 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
19984 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
19987 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
19989 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
19990 if (attr == NULL || DW_STRING (attr) == NULL)
19993 /* dwarf2_name had to be already called. */
19994 gdb_assert (DW_STRING_IS_CANONICAL (attr));
19996 /* Strip the base name, keep any leading namespaces/classes. */
19997 base = strrchr (DW_STRING (attr), ':');
19998 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
20001 return (char *) obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
20003 &base[-1] - DW_STRING (attr));
20006 /* Return the name of the namespace/class that DIE is defined within,
20007 or "" if we can't tell. The caller should not xfree the result.
20009 For example, if we're within the method foo() in the following
20019 then determine_prefix on foo's die will return "N::C". */
20021 static const char *
20022 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
20024 struct die_info *parent, *spec_die;
20025 struct dwarf2_cu *spec_cu;
20026 struct type *parent_type;
20027 const char *retval;
20029 if (cu->language != language_cplus
20030 && cu->language != language_fortran && cu->language != language_d
20031 && cu->language != language_rust)
20034 retval = anonymous_struct_prefix (die, cu);
20038 /* We have to be careful in the presence of DW_AT_specification.
20039 For example, with GCC 3.4, given the code
20043 // Definition of N::foo.
20047 then we'll have a tree of DIEs like this:
20049 1: DW_TAG_compile_unit
20050 2: DW_TAG_namespace // N
20051 3: DW_TAG_subprogram // declaration of N::foo
20052 4: DW_TAG_subprogram // definition of N::foo
20053 DW_AT_specification // refers to die #3
20055 Thus, when processing die #4, we have to pretend that we're in
20056 the context of its DW_AT_specification, namely the contex of die
20059 spec_die = die_specification (die, &spec_cu);
20060 if (spec_die == NULL)
20061 parent = die->parent;
20064 parent = spec_die->parent;
20068 if (parent == NULL)
20070 else if (parent->building_fullname)
20073 const char *parent_name;
20075 /* It has been seen on RealView 2.2 built binaries,
20076 DW_TAG_template_type_param types actually _defined_ as
20077 children of the parent class:
20080 template class <class Enum> Class{};
20081 Class<enum E> class_e;
20083 1: DW_TAG_class_type (Class)
20084 2: DW_TAG_enumeration_type (E)
20085 3: DW_TAG_enumerator (enum1:0)
20086 3: DW_TAG_enumerator (enum2:1)
20088 2: DW_TAG_template_type_param
20089 DW_AT_type DW_FORM_ref_udata (E)
20091 Besides being broken debug info, it can put GDB into an
20092 infinite loop. Consider:
20094 When we're building the full name for Class<E>, we'll start
20095 at Class, and go look over its template type parameters,
20096 finding E. We'll then try to build the full name of E, and
20097 reach here. We're now trying to build the full name of E,
20098 and look over the parent DIE for containing scope. In the
20099 broken case, if we followed the parent DIE of E, we'd again
20100 find Class, and once again go look at its template type
20101 arguments, etc., etc. Simply don't consider such parent die
20102 as source-level parent of this die (it can't be, the language
20103 doesn't allow it), and break the loop here. */
20104 name = dwarf2_name (die, cu);
20105 parent_name = dwarf2_name (parent, cu);
20106 complaint (&symfile_complaints,
20107 _("template param type '%s' defined within parent '%s'"),
20108 name ? name : "<unknown>",
20109 parent_name ? parent_name : "<unknown>");
20113 switch (parent->tag)
20115 case DW_TAG_namespace:
20116 parent_type = read_type_die (parent, cu);
20117 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
20118 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
20119 Work around this problem here. */
20120 if (cu->language == language_cplus
20121 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
20123 /* We give a name to even anonymous namespaces. */
20124 return TYPE_TAG_NAME (parent_type);
20125 case DW_TAG_class_type:
20126 case DW_TAG_interface_type:
20127 case DW_TAG_structure_type:
20128 case DW_TAG_union_type:
20129 case DW_TAG_module:
20130 parent_type = read_type_die (parent, cu);
20131 if (TYPE_TAG_NAME (parent_type) != NULL)
20132 return TYPE_TAG_NAME (parent_type);
20134 /* An anonymous structure is only allowed non-static data
20135 members; no typedefs, no member functions, et cetera.
20136 So it does not need a prefix. */
20138 case DW_TAG_compile_unit:
20139 case DW_TAG_partial_unit:
20140 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
20141 if (cu->language == language_cplus
20142 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
20143 && die->child != NULL
20144 && (die->tag == DW_TAG_class_type
20145 || die->tag == DW_TAG_structure_type
20146 || die->tag == DW_TAG_union_type))
20148 char *name = guess_full_die_structure_name (die, cu);
20153 case DW_TAG_enumeration_type:
20154 parent_type = read_type_die (parent, cu);
20155 if (TYPE_DECLARED_CLASS (parent_type))
20157 if (TYPE_TAG_NAME (parent_type) != NULL)
20158 return TYPE_TAG_NAME (parent_type);
20161 /* Fall through. */
20163 return determine_prefix (parent, cu);
20167 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
20168 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
20169 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
20170 an obconcat, otherwise allocate storage for the result. The CU argument is
20171 used to determine the language and hence, the appropriate separator. */
20173 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
20176 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
20177 int physname, struct dwarf2_cu *cu)
20179 const char *lead = "";
20182 if (suffix == NULL || suffix[0] == '\0'
20183 || prefix == NULL || prefix[0] == '\0')
20185 else if (cu->language == language_d)
20187 /* For D, the 'main' function could be defined in any module, but it
20188 should never be prefixed. */
20189 if (strcmp (suffix, "D main") == 0)
20197 else if (cu->language == language_fortran && physname)
20199 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
20200 DW_AT_MIPS_linkage_name is preferred and used instead. */
20208 if (prefix == NULL)
20210 if (suffix == NULL)
20217 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
20219 strcpy (retval, lead);
20220 strcat (retval, prefix);
20221 strcat (retval, sep);
20222 strcat (retval, suffix);
20227 /* We have an obstack. */
20228 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
20232 /* Return sibling of die, NULL if no sibling. */
20234 static struct die_info *
20235 sibling_die (struct die_info *die)
20237 return die->sibling;
20240 /* Get name of a die, return NULL if not found. */
20242 static const char *
20243 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
20244 struct obstack *obstack)
20246 if (name && cu->language == language_cplus)
20248 std::string canon_name = cp_canonicalize_string (name);
20250 if (!canon_name.empty ())
20252 if (canon_name != name)
20253 name = (const char *) obstack_copy0 (obstack,
20254 canon_name.c_str (),
20255 canon_name.length ());
20262 /* Get name of a die, return NULL if not found.
20263 Anonymous namespaces are converted to their magic string. */
20265 static const char *
20266 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
20268 struct attribute *attr;
20270 attr = dwarf2_attr (die, DW_AT_name, cu);
20271 if ((!attr || !DW_STRING (attr))
20272 && die->tag != DW_TAG_namespace
20273 && die->tag != DW_TAG_class_type
20274 && die->tag != DW_TAG_interface_type
20275 && die->tag != DW_TAG_structure_type
20276 && die->tag != DW_TAG_union_type)
20281 case DW_TAG_compile_unit:
20282 case DW_TAG_partial_unit:
20283 /* Compilation units have a DW_AT_name that is a filename, not
20284 a source language identifier. */
20285 case DW_TAG_enumeration_type:
20286 case DW_TAG_enumerator:
20287 /* These tags always have simple identifiers already; no need
20288 to canonicalize them. */
20289 return DW_STRING (attr);
20291 case DW_TAG_namespace:
20292 if (attr != NULL && DW_STRING (attr) != NULL)
20293 return DW_STRING (attr);
20294 return CP_ANONYMOUS_NAMESPACE_STR;
20296 case DW_TAG_class_type:
20297 case DW_TAG_interface_type:
20298 case DW_TAG_structure_type:
20299 case DW_TAG_union_type:
20300 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
20301 structures or unions. These were of the form "._%d" in GCC 4.1,
20302 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
20303 and GCC 4.4. We work around this problem by ignoring these. */
20304 if (attr && DW_STRING (attr)
20305 && (startswith (DW_STRING (attr), "._")
20306 || startswith (DW_STRING (attr), "<anonymous")))
20309 /* GCC might emit a nameless typedef that has a linkage name. See
20310 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
20311 if (!attr || DW_STRING (attr) == NULL)
20313 char *demangled = NULL;
20315 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
20317 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
20319 if (attr == NULL || DW_STRING (attr) == NULL)
20322 /* Avoid demangling DW_STRING (attr) the second time on a second
20323 call for the same DIE. */
20324 if (!DW_STRING_IS_CANONICAL (attr))
20325 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
20331 /* FIXME: we already did this for the partial symbol... */
20334 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
20335 demangled, strlen (demangled)));
20336 DW_STRING_IS_CANONICAL (attr) = 1;
20339 /* Strip any leading namespaces/classes, keep only the base name.
20340 DW_AT_name for named DIEs does not contain the prefixes. */
20341 base = strrchr (DW_STRING (attr), ':');
20342 if (base && base > DW_STRING (attr) && base[-1] == ':')
20345 return DW_STRING (attr);
20354 if (!DW_STRING_IS_CANONICAL (attr))
20357 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
20358 &cu->objfile->per_bfd->storage_obstack);
20359 DW_STRING_IS_CANONICAL (attr) = 1;
20361 return DW_STRING (attr);
20364 /* Return the die that this die in an extension of, or NULL if there
20365 is none. *EXT_CU is the CU containing DIE on input, and the CU
20366 containing the return value on output. */
20368 static struct die_info *
20369 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
20371 struct attribute *attr;
20373 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
20377 return follow_die_ref (die, attr, ext_cu);
20380 /* Convert a DIE tag into its string name. */
20382 static const char *
20383 dwarf_tag_name (unsigned tag)
20385 const char *name = get_DW_TAG_name (tag);
20388 return "DW_TAG_<unknown>";
20393 /* Convert a DWARF attribute code into its string name. */
20395 static const char *
20396 dwarf_attr_name (unsigned attr)
20400 #ifdef MIPS /* collides with DW_AT_HP_block_index */
20401 if (attr == DW_AT_MIPS_fde)
20402 return "DW_AT_MIPS_fde";
20404 if (attr == DW_AT_HP_block_index)
20405 return "DW_AT_HP_block_index";
20408 name = get_DW_AT_name (attr);
20411 return "DW_AT_<unknown>";
20416 /* Convert a DWARF value form code into its string name. */
20418 static const char *
20419 dwarf_form_name (unsigned form)
20421 const char *name = get_DW_FORM_name (form);
20424 return "DW_FORM_<unknown>";
20429 static const char *
20430 dwarf_bool_name (unsigned mybool)
20438 /* Convert a DWARF type code into its string name. */
20440 static const char *
20441 dwarf_type_encoding_name (unsigned enc)
20443 const char *name = get_DW_ATE_name (enc);
20446 return "DW_ATE_<unknown>";
20452 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
20456 print_spaces (indent, f);
20457 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
20458 dwarf_tag_name (die->tag), die->abbrev,
20459 to_underlying (die->sect_off));
20461 if (die->parent != NULL)
20463 print_spaces (indent, f);
20464 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
20465 to_underlying (die->parent->sect_off));
20468 print_spaces (indent, f);
20469 fprintf_unfiltered (f, " has children: %s\n",
20470 dwarf_bool_name (die->child != NULL));
20472 print_spaces (indent, f);
20473 fprintf_unfiltered (f, " attributes:\n");
20475 for (i = 0; i < die->num_attrs; ++i)
20477 print_spaces (indent, f);
20478 fprintf_unfiltered (f, " %s (%s) ",
20479 dwarf_attr_name (die->attrs[i].name),
20480 dwarf_form_name (die->attrs[i].form));
20482 switch (die->attrs[i].form)
20485 case DW_FORM_GNU_addr_index:
20486 fprintf_unfiltered (f, "address: ");
20487 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
20489 case DW_FORM_block2:
20490 case DW_FORM_block4:
20491 case DW_FORM_block:
20492 case DW_FORM_block1:
20493 fprintf_unfiltered (f, "block: size %s",
20494 pulongest (DW_BLOCK (&die->attrs[i])->size));
20496 case DW_FORM_exprloc:
20497 fprintf_unfiltered (f, "expression: size %s",
20498 pulongest (DW_BLOCK (&die->attrs[i])->size));
20500 case DW_FORM_data16:
20501 fprintf_unfiltered (f, "constant of 16 bytes");
20503 case DW_FORM_ref_addr:
20504 fprintf_unfiltered (f, "ref address: ");
20505 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
20507 case DW_FORM_GNU_ref_alt:
20508 fprintf_unfiltered (f, "alt ref address: ");
20509 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
20515 case DW_FORM_ref_udata:
20516 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
20517 (long) (DW_UNSND (&die->attrs[i])));
20519 case DW_FORM_data1:
20520 case DW_FORM_data2:
20521 case DW_FORM_data4:
20522 case DW_FORM_data8:
20523 case DW_FORM_udata:
20524 case DW_FORM_sdata:
20525 fprintf_unfiltered (f, "constant: %s",
20526 pulongest (DW_UNSND (&die->attrs[i])));
20528 case DW_FORM_sec_offset:
20529 fprintf_unfiltered (f, "section offset: %s",
20530 pulongest (DW_UNSND (&die->attrs[i])));
20532 case DW_FORM_ref_sig8:
20533 fprintf_unfiltered (f, "signature: %s",
20534 hex_string (DW_SIGNATURE (&die->attrs[i])));
20536 case DW_FORM_string:
20538 case DW_FORM_line_strp:
20539 case DW_FORM_GNU_str_index:
20540 case DW_FORM_GNU_strp_alt:
20541 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
20542 DW_STRING (&die->attrs[i])
20543 ? DW_STRING (&die->attrs[i]) : "",
20544 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
20547 if (DW_UNSND (&die->attrs[i]))
20548 fprintf_unfiltered (f, "flag: TRUE");
20550 fprintf_unfiltered (f, "flag: FALSE");
20552 case DW_FORM_flag_present:
20553 fprintf_unfiltered (f, "flag: TRUE");
20555 case DW_FORM_indirect:
20556 /* The reader will have reduced the indirect form to
20557 the "base form" so this form should not occur. */
20558 fprintf_unfiltered (f,
20559 "unexpected attribute form: DW_FORM_indirect");
20561 case DW_FORM_implicit_const:
20562 fprintf_unfiltered (f, "constant: %s",
20563 plongest (DW_SND (&die->attrs[i])));
20566 fprintf_unfiltered (f, "unsupported attribute form: %d.",
20567 die->attrs[i].form);
20570 fprintf_unfiltered (f, "\n");
20575 dump_die_for_error (struct die_info *die)
20577 dump_die_shallow (gdb_stderr, 0, die);
20581 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
20583 int indent = level * 4;
20585 gdb_assert (die != NULL);
20587 if (level >= max_level)
20590 dump_die_shallow (f, indent, die);
20592 if (die->child != NULL)
20594 print_spaces (indent, f);
20595 fprintf_unfiltered (f, " Children:");
20596 if (level + 1 < max_level)
20598 fprintf_unfiltered (f, "\n");
20599 dump_die_1 (f, level + 1, max_level, die->child);
20603 fprintf_unfiltered (f,
20604 " [not printed, max nesting level reached]\n");
20608 if (die->sibling != NULL && level > 0)
20610 dump_die_1 (f, level, max_level, die->sibling);
20614 /* This is called from the pdie macro in gdbinit.in.
20615 It's not static so gcc will keep a copy callable from gdb. */
20618 dump_die (struct die_info *die, int max_level)
20620 dump_die_1 (gdb_stdlog, 0, max_level, die);
20624 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
20628 slot = htab_find_slot_with_hash (cu->die_hash, die,
20629 to_underlying (die->sect_off),
20635 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
20639 dwarf2_get_ref_die_offset (const struct attribute *attr)
20641 if (attr_form_is_ref (attr))
20642 return (sect_offset) DW_UNSND (attr);
20644 complaint (&symfile_complaints,
20645 _("unsupported die ref attribute form: '%s'"),
20646 dwarf_form_name (attr->form));
20650 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
20651 * the value held by the attribute is not constant. */
20654 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
20656 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
20657 return DW_SND (attr);
20658 else if (attr->form == DW_FORM_udata
20659 || attr->form == DW_FORM_data1
20660 || attr->form == DW_FORM_data2
20661 || attr->form == DW_FORM_data4
20662 || attr->form == DW_FORM_data8)
20663 return DW_UNSND (attr);
20666 /* For DW_FORM_data16 see attr_form_is_constant. */
20667 complaint (&symfile_complaints,
20668 _("Attribute value is not a constant (%s)"),
20669 dwarf_form_name (attr->form));
20670 return default_value;
20674 /* Follow reference or signature attribute ATTR of SRC_DIE.
20675 On entry *REF_CU is the CU of SRC_DIE.
20676 On exit *REF_CU is the CU of the result. */
20678 static struct die_info *
20679 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
20680 struct dwarf2_cu **ref_cu)
20682 struct die_info *die;
20684 if (attr_form_is_ref (attr))
20685 die = follow_die_ref (src_die, attr, ref_cu);
20686 else if (attr->form == DW_FORM_ref_sig8)
20687 die = follow_die_sig (src_die, attr, ref_cu);
20690 dump_die_for_error (src_die);
20691 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
20692 objfile_name ((*ref_cu)->objfile));
20698 /* Follow reference OFFSET.
20699 On entry *REF_CU is the CU of the source die referencing OFFSET.
20700 On exit *REF_CU is the CU of the result.
20701 Returns NULL if OFFSET is invalid. */
20703 static struct die_info *
20704 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
20705 struct dwarf2_cu **ref_cu)
20707 struct die_info temp_die;
20708 struct dwarf2_cu *target_cu, *cu = *ref_cu;
20710 gdb_assert (cu->per_cu != NULL);
20714 if (cu->per_cu->is_debug_types)
20716 /* .debug_types CUs cannot reference anything outside their CU.
20717 If they need to, they have to reference a signatured type via
20718 DW_FORM_ref_sig8. */
20719 if (!offset_in_cu_p (&cu->header, sect_off))
20722 else if (offset_in_dwz != cu->per_cu->is_dwz
20723 || !offset_in_cu_p (&cu->header, sect_off))
20725 struct dwarf2_per_cu_data *per_cu;
20727 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
20730 /* If necessary, add it to the queue and load its DIEs. */
20731 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
20732 load_full_comp_unit (per_cu, cu->language);
20734 target_cu = per_cu->cu;
20736 else if (cu->dies == NULL)
20738 /* We're loading full DIEs during partial symbol reading. */
20739 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
20740 load_full_comp_unit (cu->per_cu, language_minimal);
20743 *ref_cu = target_cu;
20744 temp_die.sect_off = sect_off;
20745 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
20747 to_underlying (sect_off));
20750 /* Follow reference attribute ATTR of SRC_DIE.
20751 On entry *REF_CU is the CU of SRC_DIE.
20752 On exit *REF_CU is the CU of the result. */
20754 static struct die_info *
20755 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
20756 struct dwarf2_cu **ref_cu)
20758 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
20759 struct dwarf2_cu *cu = *ref_cu;
20760 struct die_info *die;
20762 die = follow_die_offset (sect_off,
20763 (attr->form == DW_FORM_GNU_ref_alt
20764 || cu->per_cu->is_dwz),
20767 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
20768 "at 0x%x [in module %s]"),
20769 to_underlying (sect_off), to_underlying (src_die->sect_off),
20770 objfile_name (cu->objfile));
20775 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
20776 Returned value is intended for DW_OP_call*. Returned
20777 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
20779 struct dwarf2_locexpr_baton
20780 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
20781 struct dwarf2_per_cu_data *per_cu,
20782 CORE_ADDR (*get_frame_pc) (void *baton),
20785 struct dwarf2_cu *cu;
20786 struct die_info *die;
20787 struct attribute *attr;
20788 struct dwarf2_locexpr_baton retval;
20790 dw2_setup (per_cu->objfile);
20792 if (per_cu->cu == NULL)
20797 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20798 Instead just throw an error, not much else we can do. */
20799 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20800 to_underlying (sect_off), objfile_name (per_cu->objfile));
20803 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20805 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20806 to_underlying (sect_off), objfile_name (per_cu->objfile));
20808 attr = dwarf2_attr (die, DW_AT_location, cu);
20811 /* DWARF: "If there is no such attribute, then there is no effect.".
20812 DATA is ignored if SIZE is 0. */
20814 retval.data = NULL;
20817 else if (attr_form_is_section_offset (attr))
20819 struct dwarf2_loclist_baton loclist_baton;
20820 CORE_ADDR pc = (*get_frame_pc) (baton);
20823 fill_in_loclist_baton (cu, &loclist_baton, attr);
20825 retval.data = dwarf2_find_location_expression (&loclist_baton,
20827 retval.size = size;
20831 if (!attr_form_is_block (attr))
20832 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
20833 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
20834 to_underlying (sect_off), objfile_name (per_cu->objfile));
20836 retval.data = DW_BLOCK (attr)->data;
20837 retval.size = DW_BLOCK (attr)->size;
20839 retval.per_cu = cu->per_cu;
20841 age_cached_comp_units ();
20846 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
20849 struct dwarf2_locexpr_baton
20850 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
20851 struct dwarf2_per_cu_data *per_cu,
20852 CORE_ADDR (*get_frame_pc) (void *baton),
20855 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
20857 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
20860 /* Write a constant of a given type as target-ordered bytes into
20863 static const gdb_byte *
20864 write_constant_as_bytes (struct obstack *obstack,
20865 enum bfd_endian byte_order,
20872 *len = TYPE_LENGTH (type);
20873 result = (gdb_byte *) obstack_alloc (obstack, *len);
20874 store_unsigned_integer (result, *len, byte_order, value);
20879 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
20880 pointer to the constant bytes and set LEN to the length of the
20881 data. If memory is needed, allocate it on OBSTACK. If the DIE
20882 does not have a DW_AT_const_value, return NULL. */
20885 dwarf2_fetch_constant_bytes (sect_offset sect_off,
20886 struct dwarf2_per_cu_data *per_cu,
20887 struct obstack *obstack,
20890 struct dwarf2_cu *cu;
20891 struct die_info *die;
20892 struct attribute *attr;
20893 const gdb_byte *result = NULL;
20896 enum bfd_endian byte_order;
20898 dw2_setup (per_cu->objfile);
20900 if (per_cu->cu == NULL)
20905 /* We shouldn't get here for a dummy CU, but don't crash on the user.
20906 Instead just throw an error, not much else we can do. */
20907 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
20908 to_underlying (sect_off), objfile_name (per_cu->objfile));
20911 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
20913 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
20914 to_underlying (sect_off), objfile_name (per_cu->objfile));
20917 attr = dwarf2_attr (die, DW_AT_const_value, cu);
20921 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
20922 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
20924 switch (attr->form)
20927 case DW_FORM_GNU_addr_index:
20931 *len = cu->header.addr_size;
20932 tem = (gdb_byte *) obstack_alloc (obstack, *len);
20933 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
20937 case DW_FORM_string:
20939 case DW_FORM_GNU_str_index:
20940 case DW_FORM_GNU_strp_alt:
20941 /* DW_STRING is already allocated on the objfile obstack, point
20943 result = (const gdb_byte *) DW_STRING (attr);
20944 *len = strlen (DW_STRING (attr));
20946 case DW_FORM_block1:
20947 case DW_FORM_block2:
20948 case DW_FORM_block4:
20949 case DW_FORM_block:
20950 case DW_FORM_exprloc:
20951 case DW_FORM_data16:
20952 result = DW_BLOCK (attr)->data;
20953 *len = DW_BLOCK (attr)->size;
20956 /* The DW_AT_const_value attributes are supposed to carry the
20957 symbol's value "represented as it would be on the target
20958 architecture." By the time we get here, it's already been
20959 converted to host endianness, so we just need to sign- or
20960 zero-extend it as appropriate. */
20961 case DW_FORM_data1:
20962 type = die_type (die, cu);
20963 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
20964 if (result == NULL)
20965 result = write_constant_as_bytes (obstack, byte_order,
20968 case DW_FORM_data2:
20969 type = die_type (die, cu);
20970 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
20971 if (result == NULL)
20972 result = write_constant_as_bytes (obstack, byte_order,
20975 case DW_FORM_data4:
20976 type = die_type (die, cu);
20977 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
20978 if (result == NULL)
20979 result = write_constant_as_bytes (obstack, byte_order,
20982 case DW_FORM_data8:
20983 type = die_type (die, cu);
20984 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
20985 if (result == NULL)
20986 result = write_constant_as_bytes (obstack, byte_order,
20990 case DW_FORM_sdata:
20991 case DW_FORM_implicit_const:
20992 type = die_type (die, cu);
20993 result = write_constant_as_bytes (obstack, byte_order,
20994 type, DW_SND (attr), len);
20997 case DW_FORM_udata:
20998 type = die_type (die, cu);
20999 result = write_constant_as_bytes (obstack, byte_order,
21000 type, DW_UNSND (attr), len);
21004 complaint (&symfile_complaints,
21005 _("unsupported const value attribute form: '%s'"),
21006 dwarf_form_name (attr->form));
21013 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
21014 valid type for this die is found. */
21017 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
21018 struct dwarf2_per_cu_data *per_cu)
21020 struct dwarf2_cu *cu;
21021 struct die_info *die;
21023 dw2_setup (per_cu->objfile);
21025 if (per_cu->cu == NULL)
21031 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
21035 return die_type (die, cu);
21038 /* Return the type of the DIE at DIE_OFFSET in the CU named by
21042 dwarf2_get_die_type (cu_offset die_offset,
21043 struct dwarf2_per_cu_data *per_cu)
21045 dw2_setup (per_cu->objfile);
21047 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
21048 return get_die_type_at_offset (die_offset_sect, per_cu);
21051 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
21052 On entry *REF_CU is the CU of SRC_DIE.
21053 On exit *REF_CU is the CU of the result.
21054 Returns NULL if the referenced DIE isn't found. */
21056 static struct die_info *
21057 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
21058 struct dwarf2_cu **ref_cu)
21060 struct die_info temp_die;
21061 struct dwarf2_cu *sig_cu;
21062 struct die_info *die;
21064 /* While it might be nice to assert sig_type->type == NULL here,
21065 we can get here for DW_AT_imported_declaration where we need
21066 the DIE not the type. */
21068 /* If necessary, add it to the queue and load its DIEs. */
21070 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
21071 read_signatured_type (sig_type);
21073 sig_cu = sig_type->per_cu.cu;
21074 gdb_assert (sig_cu != NULL);
21075 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
21076 temp_die.sect_off = sig_type->type_offset_in_section;
21077 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
21078 to_underlying (temp_die.sect_off));
21081 /* For .gdb_index version 7 keep track of included TUs.
21082 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
21083 if (dwarf2_per_objfile->index_table != NULL
21084 && dwarf2_per_objfile->index_table->version <= 7)
21086 VEC_safe_push (dwarf2_per_cu_ptr,
21087 (*ref_cu)->per_cu->imported_symtabs,
21098 /* Follow signatured type referenced by ATTR in SRC_DIE.
21099 On entry *REF_CU is the CU of SRC_DIE.
21100 On exit *REF_CU is the CU of the result.
21101 The result is the DIE of the type.
21102 If the referenced type cannot be found an error is thrown. */
21104 static struct die_info *
21105 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
21106 struct dwarf2_cu **ref_cu)
21108 ULONGEST signature = DW_SIGNATURE (attr);
21109 struct signatured_type *sig_type;
21110 struct die_info *die;
21112 gdb_assert (attr->form == DW_FORM_ref_sig8);
21114 sig_type = lookup_signatured_type (*ref_cu, signature);
21115 /* sig_type will be NULL if the signatured type is missing from
21117 if (sig_type == NULL)
21119 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
21120 " from DIE at 0x%x [in module %s]"),
21121 hex_string (signature), to_underlying (src_die->sect_off),
21122 objfile_name ((*ref_cu)->objfile));
21125 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
21128 dump_die_for_error (src_die);
21129 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
21130 " from DIE at 0x%x [in module %s]"),
21131 hex_string (signature), to_underlying (src_die->sect_off),
21132 objfile_name ((*ref_cu)->objfile));
21138 /* Get the type specified by SIGNATURE referenced in DIE/CU,
21139 reading in and processing the type unit if necessary. */
21141 static struct type *
21142 get_signatured_type (struct die_info *die, ULONGEST signature,
21143 struct dwarf2_cu *cu)
21145 struct signatured_type *sig_type;
21146 struct dwarf2_cu *type_cu;
21147 struct die_info *type_die;
21150 sig_type = lookup_signatured_type (cu, signature);
21151 /* sig_type will be NULL if the signatured type is missing from
21153 if (sig_type == NULL)
21155 complaint (&symfile_complaints,
21156 _("Dwarf Error: Cannot find signatured DIE %s referenced"
21157 " from DIE at 0x%x [in module %s]"),
21158 hex_string (signature), to_underlying (die->sect_off),
21159 objfile_name (dwarf2_per_objfile->objfile));
21160 return build_error_marker_type (cu, die);
21163 /* If we already know the type we're done. */
21164 if (sig_type->type != NULL)
21165 return sig_type->type;
21168 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
21169 if (type_die != NULL)
21171 /* N.B. We need to call get_die_type to ensure only one type for this DIE
21172 is created. This is important, for example, because for c++ classes
21173 we need TYPE_NAME set which is only done by new_symbol. Blech. */
21174 type = read_type_die (type_die, type_cu);
21177 complaint (&symfile_complaints,
21178 _("Dwarf Error: Cannot build signatured type %s"
21179 " referenced from DIE at 0x%x [in module %s]"),
21180 hex_string (signature), to_underlying (die->sect_off),
21181 objfile_name (dwarf2_per_objfile->objfile));
21182 type = build_error_marker_type (cu, die);
21187 complaint (&symfile_complaints,
21188 _("Dwarf Error: Problem reading signatured DIE %s referenced"
21189 " from DIE at 0x%x [in module %s]"),
21190 hex_string (signature), to_underlying (die->sect_off),
21191 objfile_name (dwarf2_per_objfile->objfile));
21192 type = build_error_marker_type (cu, die);
21194 sig_type->type = type;
21199 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
21200 reading in and processing the type unit if necessary. */
21202 static struct type *
21203 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
21204 struct dwarf2_cu *cu) /* ARI: editCase function */
21206 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
21207 if (attr_form_is_ref (attr))
21209 struct dwarf2_cu *type_cu = cu;
21210 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
21212 return read_type_die (type_die, type_cu);
21214 else if (attr->form == DW_FORM_ref_sig8)
21216 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
21220 complaint (&symfile_complaints,
21221 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
21222 " at 0x%x [in module %s]"),
21223 dwarf_form_name (attr->form), to_underlying (die->sect_off),
21224 objfile_name (dwarf2_per_objfile->objfile));
21225 return build_error_marker_type (cu, die);
21229 /* Load the DIEs associated with type unit PER_CU into memory. */
21232 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
21234 struct signatured_type *sig_type;
21236 /* Caller is responsible for ensuring type_unit_groups don't get here. */
21237 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
21239 /* We have the per_cu, but we need the signatured_type.
21240 Fortunately this is an easy translation. */
21241 gdb_assert (per_cu->is_debug_types);
21242 sig_type = (struct signatured_type *) per_cu;
21244 gdb_assert (per_cu->cu == NULL);
21246 read_signatured_type (sig_type);
21248 gdb_assert (per_cu->cu != NULL);
21251 /* die_reader_func for read_signatured_type.
21252 This is identical to load_full_comp_unit_reader,
21253 but is kept separate for now. */
21256 read_signatured_type_reader (const struct die_reader_specs *reader,
21257 const gdb_byte *info_ptr,
21258 struct die_info *comp_unit_die,
21262 struct dwarf2_cu *cu = reader->cu;
21264 gdb_assert (cu->die_hash == NULL);
21266 htab_create_alloc_ex (cu->header.length / 12,
21270 &cu->comp_unit_obstack,
21271 hashtab_obstack_allocate,
21272 dummy_obstack_deallocate);
21275 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
21276 &info_ptr, comp_unit_die);
21277 cu->dies = comp_unit_die;
21278 /* comp_unit_die is not stored in die_hash, no need. */
21280 /* We try not to read any attributes in this function, because not
21281 all CUs needed for references have been loaded yet, and symbol
21282 table processing isn't initialized. But we have to set the CU language,
21283 or we won't be able to build types correctly.
21284 Similarly, if we do not read the producer, we can not apply
21285 producer-specific interpretation. */
21286 prepare_one_comp_unit (cu, cu->dies, language_minimal);
21289 /* Read in a signatured type and build its CU and DIEs.
21290 If the type is a stub for the real type in a DWO file,
21291 read in the real type from the DWO file as well. */
21294 read_signatured_type (struct signatured_type *sig_type)
21296 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
21298 gdb_assert (per_cu->is_debug_types);
21299 gdb_assert (per_cu->cu == NULL);
21301 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
21302 read_signatured_type_reader, NULL);
21303 sig_type->per_cu.tu_read = 1;
21306 /* Decode simple location descriptions.
21307 Given a pointer to a dwarf block that defines a location, compute
21308 the location and return the value.
21310 NOTE drow/2003-11-18: This function is called in two situations
21311 now: for the address of static or global variables (partial symbols
21312 only) and for offsets into structures which are expected to be
21313 (more or less) constant. The partial symbol case should go away,
21314 and only the constant case should remain. That will let this
21315 function complain more accurately. A few special modes are allowed
21316 without complaint for global variables (for instance, global
21317 register values and thread-local values).
21319 A location description containing no operations indicates that the
21320 object is optimized out. The return value is 0 for that case.
21321 FIXME drow/2003-11-16: No callers check for this case any more; soon all
21322 callers will only want a very basic result and this can become a
21325 Note that stack[0] is unused except as a default error return. */
21328 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
21330 struct objfile *objfile = cu->objfile;
21332 size_t size = blk->size;
21333 const gdb_byte *data = blk->data;
21334 CORE_ADDR stack[64];
21336 unsigned int bytes_read, unsnd;
21342 stack[++stacki] = 0;
21381 stack[++stacki] = op - DW_OP_lit0;
21416 stack[++stacki] = op - DW_OP_reg0;
21418 dwarf2_complex_location_expr_complaint ();
21422 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
21424 stack[++stacki] = unsnd;
21426 dwarf2_complex_location_expr_complaint ();
21430 stack[++stacki] = read_address (objfile->obfd, &data[i],
21435 case DW_OP_const1u:
21436 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
21440 case DW_OP_const1s:
21441 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
21445 case DW_OP_const2u:
21446 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
21450 case DW_OP_const2s:
21451 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
21455 case DW_OP_const4u:
21456 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
21460 case DW_OP_const4s:
21461 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
21465 case DW_OP_const8u:
21466 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
21471 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
21477 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
21482 stack[stacki + 1] = stack[stacki];
21487 stack[stacki - 1] += stack[stacki];
21491 case DW_OP_plus_uconst:
21492 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
21498 stack[stacki - 1] -= stack[stacki];
21503 /* If we're not the last op, then we definitely can't encode
21504 this using GDB's address_class enum. This is valid for partial
21505 global symbols, although the variable's address will be bogus
21508 dwarf2_complex_location_expr_complaint ();
21511 case DW_OP_GNU_push_tls_address:
21512 case DW_OP_form_tls_address:
21513 /* The top of the stack has the offset from the beginning
21514 of the thread control block at which the variable is located. */
21515 /* Nothing should follow this operator, so the top of stack would
21517 /* This is valid for partial global symbols, but the variable's
21518 address will be bogus in the psymtab. Make it always at least
21519 non-zero to not look as a variable garbage collected by linker
21520 which have DW_OP_addr 0. */
21522 dwarf2_complex_location_expr_complaint ();
21526 case DW_OP_GNU_uninit:
21529 case DW_OP_GNU_addr_index:
21530 case DW_OP_GNU_const_index:
21531 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
21538 const char *name = get_DW_OP_name (op);
21541 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
21544 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
21548 return (stack[stacki]);
21551 /* Enforce maximum stack depth of SIZE-1 to avoid writing
21552 outside of the allocated space. Also enforce minimum>0. */
21553 if (stacki >= ARRAY_SIZE (stack) - 1)
21555 complaint (&symfile_complaints,
21556 _("location description stack overflow"));
21562 complaint (&symfile_complaints,
21563 _("location description stack underflow"));
21567 return (stack[stacki]);
21570 /* memory allocation interface */
21572 static struct dwarf_block *
21573 dwarf_alloc_block (struct dwarf2_cu *cu)
21575 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
21578 static struct die_info *
21579 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
21581 struct die_info *die;
21582 size_t size = sizeof (struct die_info);
21585 size += (num_attrs - 1) * sizeof (struct attribute);
21587 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
21588 memset (die, 0, sizeof (struct die_info));
21593 /* Macro support. */
21595 /* Return file name relative to the compilation directory of file number I in
21596 *LH's file name table. The result is allocated using xmalloc; the caller is
21597 responsible for freeing it. */
21600 file_file_name (int file, struct line_header *lh)
21602 /* Is the file number a valid index into the line header's file name
21603 table? Remember that file numbers start with one, not zero. */
21604 if (1 <= file && file <= lh->file_names.size ())
21606 const file_entry &fe = lh->file_names[file - 1];
21608 if (!IS_ABSOLUTE_PATH (fe.name))
21610 const char *dir = fe.include_dir (lh);
21612 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
21614 return xstrdup (fe.name);
21618 /* The compiler produced a bogus file number. We can at least
21619 record the macro definitions made in the file, even if we
21620 won't be able to find the file by name. */
21621 char fake_name[80];
21623 xsnprintf (fake_name, sizeof (fake_name),
21624 "<bad macro file number %d>", file);
21626 complaint (&symfile_complaints,
21627 _("bad file number in macro information (%d)"),
21630 return xstrdup (fake_name);
21634 /* Return the full name of file number I in *LH's file name table.
21635 Use COMP_DIR as the name of the current directory of the
21636 compilation. The result is allocated using xmalloc; the caller is
21637 responsible for freeing it. */
21639 file_full_name (int file, struct line_header *lh, const char *comp_dir)
21641 /* Is the file number a valid index into the line header's file name
21642 table? Remember that file numbers start with one, not zero. */
21643 if (1 <= file && file <= lh->file_names.size ())
21645 char *relative = file_file_name (file, lh);
21647 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
21649 return reconcat (relative, comp_dir, SLASH_STRING,
21650 relative, (char *) NULL);
21653 return file_file_name (file, lh);
21657 static struct macro_source_file *
21658 macro_start_file (int file, int line,
21659 struct macro_source_file *current_file,
21660 struct line_header *lh)
21662 /* File name relative to the compilation directory of this source file. */
21663 char *file_name = file_file_name (file, lh);
21665 if (! current_file)
21667 /* Note: We don't create a macro table for this compilation unit
21668 at all until we actually get a filename. */
21669 struct macro_table *macro_table = get_macro_table ();
21671 /* If we have no current file, then this must be the start_file
21672 directive for the compilation unit's main source file. */
21673 current_file = macro_set_main (macro_table, file_name);
21674 macro_define_special (macro_table);
21677 current_file = macro_include (current_file, line, file_name);
21681 return current_file;
21685 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
21686 followed by a null byte. */
21688 copy_string (const char *buf, int len)
21690 char *s = (char *) xmalloc (len + 1);
21692 memcpy (s, buf, len);
21698 static const char *
21699 consume_improper_spaces (const char *p, const char *body)
21703 complaint (&symfile_complaints,
21704 _("macro definition contains spaces "
21705 "in formal argument list:\n`%s'"),
21717 parse_macro_definition (struct macro_source_file *file, int line,
21722 /* The body string takes one of two forms. For object-like macro
21723 definitions, it should be:
21725 <macro name> " " <definition>
21727 For function-like macro definitions, it should be:
21729 <macro name> "() " <definition>
21731 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
21733 Spaces may appear only where explicitly indicated, and in the
21736 The Dwarf 2 spec says that an object-like macro's name is always
21737 followed by a space, but versions of GCC around March 2002 omit
21738 the space when the macro's definition is the empty string.
21740 The Dwarf 2 spec says that there should be no spaces between the
21741 formal arguments in a function-like macro's formal argument list,
21742 but versions of GCC around March 2002 include spaces after the
21746 /* Find the extent of the macro name. The macro name is terminated
21747 by either a space or null character (for an object-like macro) or
21748 an opening paren (for a function-like macro). */
21749 for (p = body; *p; p++)
21750 if (*p == ' ' || *p == '(')
21753 if (*p == ' ' || *p == '\0')
21755 /* It's an object-like macro. */
21756 int name_len = p - body;
21757 char *name = copy_string (body, name_len);
21758 const char *replacement;
21761 replacement = body + name_len + 1;
21764 dwarf2_macro_malformed_definition_complaint (body);
21765 replacement = body + name_len;
21768 macro_define_object (file, line, name, replacement);
21772 else if (*p == '(')
21774 /* It's a function-like macro. */
21775 char *name = copy_string (body, p - body);
21778 char **argv = XNEWVEC (char *, argv_size);
21782 p = consume_improper_spaces (p, body);
21784 /* Parse the formal argument list. */
21785 while (*p && *p != ')')
21787 /* Find the extent of the current argument name. */
21788 const char *arg_start = p;
21790 while (*p && *p != ',' && *p != ')' && *p != ' ')
21793 if (! *p || p == arg_start)
21794 dwarf2_macro_malformed_definition_complaint (body);
21797 /* Make sure argv has room for the new argument. */
21798 if (argc >= argv_size)
21801 argv = XRESIZEVEC (char *, argv, argv_size);
21804 argv[argc++] = copy_string (arg_start, p - arg_start);
21807 p = consume_improper_spaces (p, body);
21809 /* Consume the comma, if present. */
21814 p = consume_improper_spaces (p, body);
21823 /* Perfectly formed definition, no complaints. */
21824 macro_define_function (file, line, name,
21825 argc, (const char **) argv,
21827 else if (*p == '\0')
21829 /* Complain, but do define it. */
21830 dwarf2_macro_malformed_definition_complaint (body);
21831 macro_define_function (file, line, name,
21832 argc, (const char **) argv,
21836 /* Just complain. */
21837 dwarf2_macro_malformed_definition_complaint (body);
21840 /* Just complain. */
21841 dwarf2_macro_malformed_definition_complaint (body);
21847 for (i = 0; i < argc; i++)
21853 dwarf2_macro_malformed_definition_complaint (body);
21856 /* Skip some bytes from BYTES according to the form given in FORM.
21857 Returns the new pointer. */
21859 static const gdb_byte *
21860 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
21861 enum dwarf_form form,
21862 unsigned int offset_size,
21863 struct dwarf2_section_info *section)
21865 unsigned int bytes_read;
21869 case DW_FORM_data1:
21874 case DW_FORM_data2:
21878 case DW_FORM_data4:
21882 case DW_FORM_data8:
21886 case DW_FORM_data16:
21890 case DW_FORM_string:
21891 read_direct_string (abfd, bytes, &bytes_read);
21892 bytes += bytes_read;
21895 case DW_FORM_sec_offset:
21897 case DW_FORM_GNU_strp_alt:
21898 bytes += offset_size;
21901 case DW_FORM_block:
21902 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
21903 bytes += bytes_read;
21906 case DW_FORM_block1:
21907 bytes += 1 + read_1_byte (abfd, bytes);
21909 case DW_FORM_block2:
21910 bytes += 2 + read_2_bytes (abfd, bytes);
21912 case DW_FORM_block4:
21913 bytes += 4 + read_4_bytes (abfd, bytes);
21916 case DW_FORM_sdata:
21917 case DW_FORM_udata:
21918 case DW_FORM_GNU_addr_index:
21919 case DW_FORM_GNU_str_index:
21920 bytes = gdb_skip_leb128 (bytes, buffer_end);
21923 dwarf2_section_buffer_overflow_complaint (section);
21928 case DW_FORM_implicit_const:
21934 complaint (&symfile_complaints,
21935 _("invalid form 0x%x in `%s'"),
21936 form, get_section_name (section));
21944 /* A helper for dwarf_decode_macros that handles skipping an unknown
21945 opcode. Returns an updated pointer to the macro data buffer; or,
21946 on error, issues a complaint and returns NULL. */
21948 static const gdb_byte *
21949 skip_unknown_opcode (unsigned int opcode,
21950 const gdb_byte **opcode_definitions,
21951 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
21953 unsigned int offset_size,
21954 struct dwarf2_section_info *section)
21956 unsigned int bytes_read, i;
21958 const gdb_byte *defn;
21960 if (opcode_definitions[opcode] == NULL)
21962 complaint (&symfile_complaints,
21963 _("unrecognized DW_MACFINO opcode 0x%x"),
21968 defn = opcode_definitions[opcode];
21969 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
21970 defn += bytes_read;
21972 for (i = 0; i < arg; ++i)
21974 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
21975 (enum dwarf_form) defn[i], offset_size,
21977 if (mac_ptr == NULL)
21979 /* skip_form_bytes already issued the complaint. */
21987 /* A helper function which parses the header of a macro section.
21988 If the macro section is the extended (for now called "GNU") type,
21989 then this updates *OFFSET_SIZE. Returns a pointer to just after
21990 the header, or issues a complaint and returns NULL on error. */
21992 static const gdb_byte *
21993 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
21995 const gdb_byte *mac_ptr,
21996 unsigned int *offset_size,
21997 int section_is_gnu)
21999 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
22001 if (section_is_gnu)
22003 unsigned int version, flags;
22005 version = read_2_bytes (abfd, mac_ptr);
22006 if (version != 4 && version != 5)
22008 complaint (&symfile_complaints,
22009 _("unrecognized version `%d' in .debug_macro section"),
22015 flags = read_1_byte (abfd, mac_ptr);
22017 *offset_size = (flags & 1) ? 8 : 4;
22019 if ((flags & 2) != 0)
22020 /* We don't need the line table offset. */
22021 mac_ptr += *offset_size;
22023 /* Vendor opcode descriptions. */
22024 if ((flags & 4) != 0)
22026 unsigned int i, count;
22028 count = read_1_byte (abfd, mac_ptr);
22030 for (i = 0; i < count; ++i)
22032 unsigned int opcode, bytes_read;
22035 opcode = read_1_byte (abfd, mac_ptr);
22037 opcode_definitions[opcode] = mac_ptr;
22038 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22039 mac_ptr += bytes_read;
22048 /* A helper for dwarf_decode_macros that handles the GNU extensions,
22049 including DW_MACRO_import. */
22052 dwarf_decode_macro_bytes (bfd *abfd,
22053 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
22054 struct macro_source_file *current_file,
22055 struct line_header *lh,
22056 struct dwarf2_section_info *section,
22057 int section_is_gnu, int section_is_dwz,
22058 unsigned int offset_size,
22059 htab_t include_hash)
22061 struct objfile *objfile = dwarf2_per_objfile->objfile;
22062 enum dwarf_macro_record_type macinfo_type;
22063 int at_commandline;
22064 const gdb_byte *opcode_definitions[256];
22066 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
22067 &offset_size, section_is_gnu);
22068 if (mac_ptr == NULL)
22070 /* We already issued a complaint. */
22074 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
22075 GDB is still reading the definitions from command line. First
22076 DW_MACINFO_start_file will need to be ignored as it was already executed
22077 to create CURRENT_FILE for the main source holding also the command line
22078 definitions. On first met DW_MACINFO_start_file this flag is reset to
22079 normally execute all the remaining DW_MACINFO_start_file macinfos. */
22081 at_commandline = 1;
22085 /* Do we at least have room for a macinfo type byte? */
22086 if (mac_ptr >= mac_end)
22088 dwarf2_section_buffer_overflow_complaint (section);
22092 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
22095 /* Note that we rely on the fact that the corresponding GNU and
22096 DWARF constants are the same. */
22097 switch (macinfo_type)
22099 /* A zero macinfo type indicates the end of the macro
22104 case DW_MACRO_define:
22105 case DW_MACRO_undef:
22106 case DW_MACRO_define_strp:
22107 case DW_MACRO_undef_strp:
22108 case DW_MACRO_define_sup:
22109 case DW_MACRO_undef_sup:
22111 unsigned int bytes_read;
22116 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22117 mac_ptr += bytes_read;
22119 if (macinfo_type == DW_MACRO_define
22120 || macinfo_type == DW_MACRO_undef)
22122 body = read_direct_string (abfd, mac_ptr, &bytes_read);
22123 mac_ptr += bytes_read;
22127 LONGEST str_offset;
22129 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
22130 mac_ptr += offset_size;
22132 if (macinfo_type == DW_MACRO_define_sup
22133 || macinfo_type == DW_MACRO_undef_sup
22136 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22138 body = read_indirect_string_from_dwz (dwz, str_offset);
22141 body = read_indirect_string_at_offset (abfd, str_offset);
22144 is_define = (macinfo_type == DW_MACRO_define
22145 || macinfo_type == DW_MACRO_define_strp
22146 || macinfo_type == DW_MACRO_define_sup);
22147 if (! current_file)
22149 /* DWARF violation as no main source is present. */
22150 complaint (&symfile_complaints,
22151 _("debug info with no main source gives macro %s "
22153 is_define ? _("definition") : _("undefinition"),
22157 if ((line == 0 && !at_commandline)
22158 || (line != 0 && at_commandline))
22159 complaint (&symfile_complaints,
22160 _("debug info gives %s macro %s with %s line %d: %s"),
22161 at_commandline ? _("command-line") : _("in-file"),
22162 is_define ? _("definition") : _("undefinition"),
22163 line == 0 ? _("zero") : _("non-zero"), line, body);
22166 parse_macro_definition (current_file, line, body);
22169 gdb_assert (macinfo_type == DW_MACRO_undef
22170 || macinfo_type == DW_MACRO_undef_strp
22171 || macinfo_type == DW_MACRO_undef_sup);
22172 macro_undef (current_file, line, body);
22177 case DW_MACRO_start_file:
22179 unsigned int bytes_read;
22182 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22183 mac_ptr += bytes_read;
22184 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22185 mac_ptr += bytes_read;
22187 if ((line == 0 && !at_commandline)
22188 || (line != 0 && at_commandline))
22189 complaint (&symfile_complaints,
22190 _("debug info gives source %d included "
22191 "from %s at %s line %d"),
22192 file, at_commandline ? _("command-line") : _("file"),
22193 line == 0 ? _("zero") : _("non-zero"), line);
22195 if (at_commandline)
22197 /* This DW_MACRO_start_file was executed in the
22199 at_commandline = 0;
22202 current_file = macro_start_file (file, line, current_file, lh);
22206 case DW_MACRO_end_file:
22207 if (! current_file)
22208 complaint (&symfile_complaints,
22209 _("macro debug info has an unmatched "
22210 "`close_file' directive"));
22213 current_file = current_file->included_by;
22214 if (! current_file)
22216 enum dwarf_macro_record_type next_type;
22218 /* GCC circa March 2002 doesn't produce the zero
22219 type byte marking the end of the compilation
22220 unit. Complain if it's not there, but exit no
22223 /* Do we at least have room for a macinfo type byte? */
22224 if (mac_ptr >= mac_end)
22226 dwarf2_section_buffer_overflow_complaint (section);
22230 /* We don't increment mac_ptr here, so this is just
22233 = (enum dwarf_macro_record_type) read_1_byte (abfd,
22235 if (next_type != 0)
22236 complaint (&symfile_complaints,
22237 _("no terminating 0-type entry for "
22238 "macros in `.debug_macinfo' section"));
22245 case DW_MACRO_import:
22246 case DW_MACRO_import_sup:
22250 bfd *include_bfd = abfd;
22251 struct dwarf2_section_info *include_section = section;
22252 const gdb_byte *include_mac_end = mac_end;
22253 int is_dwz = section_is_dwz;
22254 const gdb_byte *new_mac_ptr;
22256 offset = read_offset_1 (abfd, mac_ptr, offset_size);
22257 mac_ptr += offset_size;
22259 if (macinfo_type == DW_MACRO_import_sup)
22261 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22263 dwarf2_read_section (objfile, &dwz->macro);
22265 include_section = &dwz->macro;
22266 include_bfd = get_section_bfd_owner (include_section);
22267 include_mac_end = dwz->macro.buffer + dwz->macro.size;
22271 new_mac_ptr = include_section->buffer + offset;
22272 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
22276 /* This has actually happened; see
22277 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
22278 complaint (&symfile_complaints,
22279 _("recursive DW_MACRO_import in "
22280 ".debug_macro section"));
22284 *slot = (void *) new_mac_ptr;
22286 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
22287 include_mac_end, current_file, lh,
22288 section, section_is_gnu, is_dwz,
22289 offset_size, include_hash);
22291 htab_remove_elt (include_hash, (void *) new_mac_ptr);
22296 case DW_MACINFO_vendor_ext:
22297 if (!section_is_gnu)
22299 unsigned int bytes_read;
22301 /* This reads the constant, but since we don't recognize
22302 any vendor extensions, we ignore it. */
22303 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22304 mac_ptr += bytes_read;
22305 read_direct_string (abfd, mac_ptr, &bytes_read);
22306 mac_ptr += bytes_read;
22308 /* We don't recognize any vendor extensions. */
22314 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
22315 mac_ptr, mac_end, abfd, offset_size,
22317 if (mac_ptr == NULL)
22321 } while (macinfo_type != 0);
22325 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
22326 int section_is_gnu)
22328 struct objfile *objfile = dwarf2_per_objfile->objfile;
22329 struct line_header *lh = cu->line_header;
22331 const gdb_byte *mac_ptr, *mac_end;
22332 struct macro_source_file *current_file = 0;
22333 enum dwarf_macro_record_type macinfo_type;
22334 unsigned int offset_size = cu->header.offset_size;
22335 const gdb_byte *opcode_definitions[256];
22336 struct cleanup *cleanup;
22338 struct dwarf2_section_info *section;
22339 const char *section_name;
22341 if (cu->dwo_unit != NULL)
22343 if (section_is_gnu)
22345 section = &cu->dwo_unit->dwo_file->sections.macro;
22346 section_name = ".debug_macro.dwo";
22350 section = &cu->dwo_unit->dwo_file->sections.macinfo;
22351 section_name = ".debug_macinfo.dwo";
22356 if (section_is_gnu)
22358 section = &dwarf2_per_objfile->macro;
22359 section_name = ".debug_macro";
22363 section = &dwarf2_per_objfile->macinfo;
22364 section_name = ".debug_macinfo";
22368 dwarf2_read_section (objfile, section);
22369 if (section->buffer == NULL)
22371 complaint (&symfile_complaints, _("missing %s section"), section_name);
22374 abfd = get_section_bfd_owner (section);
22376 /* First pass: Find the name of the base filename.
22377 This filename is needed in order to process all macros whose definition
22378 (or undefinition) comes from the command line. These macros are defined
22379 before the first DW_MACINFO_start_file entry, and yet still need to be
22380 associated to the base file.
22382 To determine the base file name, we scan the macro definitions until we
22383 reach the first DW_MACINFO_start_file entry. We then initialize
22384 CURRENT_FILE accordingly so that any macro definition found before the
22385 first DW_MACINFO_start_file can still be associated to the base file. */
22387 mac_ptr = section->buffer + offset;
22388 mac_end = section->buffer + section->size;
22390 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
22391 &offset_size, section_is_gnu);
22392 if (mac_ptr == NULL)
22394 /* We already issued a complaint. */
22400 /* Do we at least have room for a macinfo type byte? */
22401 if (mac_ptr >= mac_end)
22403 /* Complaint is printed during the second pass as GDB will probably
22404 stop the first pass earlier upon finding
22405 DW_MACINFO_start_file. */
22409 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
22412 /* Note that we rely on the fact that the corresponding GNU and
22413 DWARF constants are the same. */
22414 switch (macinfo_type)
22416 /* A zero macinfo type indicates the end of the macro
22421 case DW_MACRO_define:
22422 case DW_MACRO_undef:
22423 /* Only skip the data by MAC_PTR. */
22425 unsigned int bytes_read;
22427 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22428 mac_ptr += bytes_read;
22429 read_direct_string (abfd, mac_ptr, &bytes_read);
22430 mac_ptr += bytes_read;
22434 case DW_MACRO_start_file:
22436 unsigned int bytes_read;
22439 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22440 mac_ptr += bytes_read;
22441 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22442 mac_ptr += bytes_read;
22444 current_file = macro_start_file (file, line, current_file, lh);
22448 case DW_MACRO_end_file:
22449 /* No data to skip by MAC_PTR. */
22452 case DW_MACRO_define_strp:
22453 case DW_MACRO_undef_strp:
22454 case DW_MACRO_define_sup:
22455 case DW_MACRO_undef_sup:
22457 unsigned int bytes_read;
22459 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22460 mac_ptr += bytes_read;
22461 mac_ptr += offset_size;
22465 case DW_MACRO_import:
22466 case DW_MACRO_import_sup:
22467 /* Note that, according to the spec, a transparent include
22468 chain cannot call DW_MACRO_start_file. So, we can just
22469 skip this opcode. */
22470 mac_ptr += offset_size;
22473 case DW_MACINFO_vendor_ext:
22474 /* Only skip the data by MAC_PTR. */
22475 if (!section_is_gnu)
22477 unsigned int bytes_read;
22479 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22480 mac_ptr += bytes_read;
22481 read_direct_string (abfd, mac_ptr, &bytes_read);
22482 mac_ptr += bytes_read;
22487 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
22488 mac_ptr, mac_end, abfd, offset_size,
22490 if (mac_ptr == NULL)
22494 } while (macinfo_type != 0 && current_file == NULL);
22496 /* Second pass: Process all entries.
22498 Use the AT_COMMAND_LINE flag to determine whether we are still processing
22499 command-line macro definitions/undefinitions. This flag is unset when we
22500 reach the first DW_MACINFO_start_file entry. */
22502 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
22504 NULL, xcalloc, xfree));
22505 mac_ptr = section->buffer + offset;
22506 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
22507 *slot = (void *) mac_ptr;
22508 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
22509 current_file, lh, section,
22510 section_is_gnu, 0, offset_size,
22511 include_hash.get ());
22514 /* Check if the attribute's form is a DW_FORM_block*
22515 if so return true else false. */
22518 attr_form_is_block (const struct attribute *attr)
22520 return (attr == NULL ? 0 :
22521 attr->form == DW_FORM_block1
22522 || attr->form == DW_FORM_block2
22523 || attr->form == DW_FORM_block4
22524 || attr->form == DW_FORM_block
22525 || attr->form == DW_FORM_exprloc);
22528 /* Return non-zero if ATTR's value is a section offset --- classes
22529 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
22530 You may use DW_UNSND (attr) to retrieve such offsets.
22532 Section 7.5.4, "Attribute Encodings", explains that no attribute
22533 may have a value that belongs to more than one of these classes; it
22534 would be ambiguous if we did, because we use the same forms for all
22538 attr_form_is_section_offset (const struct attribute *attr)
22540 return (attr->form == DW_FORM_data4
22541 || attr->form == DW_FORM_data8
22542 || attr->form == DW_FORM_sec_offset);
22545 /* Return non-zero if ATTR's value falls in the 'constant' class, or
22546 zero otherwise. When this function returns true, you can apply
22547 dwarf2_get_attr_constant_value to it.
22549 However, note that for some attributes you must check
22550 attr_form_is_section_offset before using this test. DW_FORM_data4
22551 and DW_FORM_data8 are members of both the constant class, and of
22552 the classes that contain offsets into other debug sections
22553 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
22554 that, if an attribute's can be either a constant or one of the
22555 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
22556 taken as section offsets, not constants.
22558 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
22559 cannot handle that. */
22562 attr_form_is_constant (const struct attribute *attr)
22564 switch (attr->form)
22566 case DW_FORM_sdata:
22567 case DW_FORM_udata:
22568 case DW_FORM_data1:
22569 case DW_FORM_data2:
22570 case DW_FORM_data4:
22571 case DW_FORM_data8:
22572 case DW_FORM_implicit_const:
22580 /* DW_ADDR is always stored already as sect_offset; despite for the forms
22581 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
22584 attr_form_is_ref (const struct attribute *attr)
22586 switch (attr->form)
22588 case DW_FORM_ref_addr:
22593 case DW_FORM_ref_udata:
22594 case DW_FORM_GNU_ref_alt:
22601 /* Return the .debug_loc section to use for CU.
22602 For DWO files use .debug_loc.dwo. */
22604 static struct dwarf2_section_info *
22605 cu_debug_loc_section (struct dwarf2_cu *cu)
22609 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
22611 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
22613 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
22614 : &dwarf2_per_objfile->loc);
22617 /* A helper function that fills in a dwarf2_loclist_baton. */
22620 fill_in_loclist_baton (struct dwarf2_cu *cu,
22621 struct dwarf2_loclist_baton *baton,
22622 const struct attribute *attr)
22624 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
22626 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
22628 baton->per_cu = cu->per_cu;
22629 gdb_assert (baton->per_cu);
22630 /* We don't know how long the location list is, but make sure we
22631 don't run off the edge of the section. */
22632 baton->size = section->size - DW_UNSND (attr);
22633 baton->data = section->buffer + DW_UNSND (attr);
22634 baton->base_address = cu->base_address;
22635 baton->from_dwo = cu->dwo_unit != NULL;
22639 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
22640 struct dwarf2_cu *cu, int is_block)
22642 struct objfile *objfile = dwarf2_per_objfile->objfile;
22643 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
22645 if (attr_form_is_section_offset (attr)
22646 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
22647 the section. If so, fall through to the complaint in the
22649 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
22651 struct dwarf2_loclist_baton *baton;
22653 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
22655 fill_in_loclist_baton (cu, baton, attr);
22657 if (cu->base_known == 0)
22658 complaint (&symfile_complaints,
22659 _("Location list used without "
22660 "specifying the CU base address."));
22662 SYMBOL_ACLASS_INDEX (sym) = (is_block
22663 ? dwarf2_loclist_block_index
22664 : dwarf2_loclist_index);
22665 SYMBOL_LOCATION_BATON (sym) = baton;
22669 struct dwarf2_locexpr_baton *baton;
22671 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
22672 baton->per_cu = cu->per_cu;
22673 gdb_assert (baton->per_cu);
22675 if (attr_form_is_block (attr))
22677 /* Note that we're just copying the block's data pointer
22678 here, not the actual data. We're still pointing into the
22679 info_buffer for SYM's objfile; right now we never release
22680 that buffer, but when we do clean up properly this may
22682 baton->size = DW_BLOCK (attr)->size;
22683 baton->data = DW_BLOCK (attr)->data;
22687 dwarf2_invalid_attrib_class_complaint ("location description",
22688 SYMBOL_NATURAL_NAME (sym));
22692 SYMBOL_ACLASS_INDEX (sym) = (is_block
22693 ? dwarf2_locexpr_block_index
22694 : dwarf2_locexpr_index);
22695 SYMBOL_LOCATION_BATON (sym) = baton;
22699 /* Return the OBJFILE associated with the compilation unit CU. If CU
22700 came from a separate debuginfo file, then the master objfile is
22704 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
22706 struct objfile *objfile = per_cu->objfile;
22708 /* Return the master objfile, so that we can report and look up the
22709 correct file containing this variable. */
22710 if (objfile->separate_debug_objfile_backlink)
22711 objfile = objfile->separate_debug_objfile_backlink;
22716 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
22717 (CU_HEADERP is unused in such case) or prepare a temporary copy at
22718 CU_HEADERP first. */
22720 static const struct comp_unit_head *
22721 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
22722 struct dwarf2_per_cu_data *per_cu)
22724 const gdb_byte *info_ptr;
22727 return &per_cu->cu->header;
22729 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
22731 memset (cu_headerp, 0, sizeof (*cu_headerp));
22732 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
22733 rcuh_kind::COMPILE);
22738 /* Return the address size given in the compilation unit header for CU. */
22741 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
22743 struct comp_unit_head cu_header_local;
22744 const struct comp_unit_head *cu_headerp;
22746 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22748 return cu_headerp->addr_size;
22751 /* Return the offset size given in the compilation unit header for CU. */
22754 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
22756 struct comp_unit_head cu_header_local;
22757 const struct comp_unit_head *cu_headerp;
22759 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22761 return cu_headerp->offset_size;
22764 /* See its dwarf2loc.h declaration. */
22767 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
22769 struct comp_unit_head cu_header_local;
22770 const struct comp_unit_head *cu_headerp;
22772 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
22774 if (cu_headerp->version == 2)
22775 return cu_headerp->addr_size;
22777 return cu_headerp->offset_size;
22780 /* Return the text offset of the CU. The returned offset comes from
22781 this CU's objfile. If this objfile came from a separate debuginfo
22782 file, then the offset may be different from the corresponding
22783 offset in the parent objfile. */
22786 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
22788 struct objfile *objfile = per_cu->objfile;
22790 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
22793 /* Return DWARF version number of PER_CU. */
22796 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
22798 return per_cu->dwarf_version;
22801 /* Locate the .debug_info compilation unit from CU's objfile which contains
22802 the DIE at OFFSET. Raises an error on failure. */
22804 static struct dwarf2_per_cu_data *
22805 dwarf2_find_containing_comp_unit (sect_offset sect_off,
22806 unsigned int offset_in_dwz,
22807 struct objfile *objfile)
22809 struct dwarf2_per_cu_data *this_cu;
22811 const sect_offset *cu_off;
22814 high = dwarf2_per_objfile->n_comp_units - 1;
22817 struct dwarf2_per_cu_data *mid_cu;
22818 int mid = low + (high - low) / 2;
22820 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
22821 cu_off = &mid_cu->sect_off;
22822 if (mid_cu->is_dwz > offset_in_dwz
22823 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
22828 gdb_assert (low == high);
22829 this_cu = dwarf2_per_objfile->all_comp_units[low];
22830 cu_off = &this_cu->sect_off;
22831 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
22833 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
22834 error (_("Dwarf Error: could not find partial DIE containing "
22835 "offset 0x%x [in module %s]"),
22836 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
22838 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
22840 return dwarf2_per_objfile->all_comp_units[low-1];
22844 this_cu = dwarf2_per_objfile->all_comp_units[low];
22845 if (low == dwarf2_per_objfile->n_comp_units - 1
22846 && sect_off >= this_cu->sect_off + this_cu->length)
22847 error (_("invalid dwarf2 offset %u"), to_underlying (sect_off));
22848 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
22853 /* Initialize dwarf2_cu CU, owned by PER_CU. */
22856 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
22858 memset (cu, 0, sizeof (*cu));
22860 cu->per_cu = per_cu;
22861 cu->objfile = per_cu->objfile;
22862 obstack_init (&cu->comp_unit_obstack);
22865 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
22868 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
22869 enum language pretend_language)
22871 struct attribute *attr;
22873 /* Set the language we're debugging. */
22874 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
22876 set_cu_language (DW_UNSND (attr), cu);
22879 cu->language = pretend_language;
22880 cu->language_defn = language_def (cu->language);
22883 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
22886 /* Release one cached compilation unit, CU. We unlink it from the tree
22887 of compilation units, but we don't remove it from the read_in_chain;
22888 the caller is responsible for that.
22889 NOTE: DATA is a void * because this function is also used as a
22890 cleanup routine. */
22893 free_heap_comp_unit (void *data)
22895 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22897 gdb_assert (cu->per_cu != NULL);
22898 cu->per_cu->cu = NULL;
22901 obstack_free (&cu->comp_unit_obstack, NULL);
22906 /* This cleanup function is passed the address of a dwarf2_cu on the stack
22907 when we're finished with it. We can't free the pointer itself, but be
22908 sure to unlink it from the cache. Also release any associated storage. */
22911 free_stack_comp_unit (void *data)
22913 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
22915 gdb_assert (cu->per_cu != NULL);
22916 cu->per_cu->cu = NULL;
22919 obstack_free (&cu->comp_unit_obstack, NULL);
22920 cu->partial_dies = NULL;
22923 /* Free all cached compilation units. */
22926 free_cached_comp_units (void *data)
22928 dwarf2_per_objfile->free_cached_comp_units ();
22931 /* Increase the age counter on each cached compilation unit, and free
22932 any that are too old. */
22935 age_cached_comp_units (void)
22937 struct dwarf2_per_cu_data *per_cu, **last_chain;
22939 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
22940 per_cu = dwarf2_per_objfile->read_in_chain;
22941 while (per_cu != NULL)
22943 per_cu->cu->last_used ++;
22944 if (per_cu->cu->last_used <= dwarf_max_cache_age)
22945 dwarf2_mark (per_cu->cu);
22946 per_cu = per_cu->cu->read_in_chain;
22949 per_cu = dwarf2_per_objfile->read_in_chain;
22950 last_chain = &dwarf2_per_objfile->read_in_chain;
22951 while (per_cu != NULL)
22953 struct dwarf2_per_cu_data *next_cu;
22955 next_cu = per_cu->cu->read_in_chain;
22957 if (!per_cu->cu->mark)
22959 free_heap_comp_unit (per_cu->cu);
22960 *last_chain = next_cu;
22963 last_chain = &per_cu->cu->read_in_chain;
22969 /* Remove a single compilation unit from the cache. */
22972 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
22974 struct dwarf2_per_cu_data *per_cu, **last_chain;
22976 per_cu = dwarf2_per_objfile->read_in_chain;
22977 last_chain = &dwarf2_per_objfile->read_in_chain;
22978 while (per_cu != NULL)
22980 struct dwarf2_per_cu_data *next_cu;
22982 next_cu = per_cu->cu->read_in_chain;
22984 if (per_cu == target_per_cu)
22986 free_heap_comp_unit (per_cu->cu);
22988 *last_chain = next_cu;
22992 last_chain = &per_cu->cu->read_in_chain;
22998 /* Release all extra memory associated with OBJFILE. */
23001 dwarf2_free_objfile (struct objfile *objfile)
23004 = (struct dwarf2_per_objfile *) objfile_data (objfile,
23005 dwarf2_objfile_data_key);
23007 if (dwarf2_per_objfile == NULL)
23010 dwarf2_per_objfile->~dwarf2_per_objfile ();
23013 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
23014 We store these in a hash table separate from the DIEs, and preserve them
23015 when the DIEs are flushed out of cache.
23017 The CU "per_cu" pointer is needed because offset alone is not enough to
23018 uniquely identify the type. A file may have multiple .debug_types sections,
23019 or the type may come from a DWO file. Furthermore, while it's more logical
23020 to use per_cu->section+offset, with Fission the section with the data is in
23021 the DWO file but we don't know that section at the point we need it.
23022 We have to use something in dwarf2_per_cu_data (or the pointer to it)
23023 because we can enter the lookup routine, get_die_type_at_offset, from
23024 outside this file, and thus won't necessarily have PER_CU->cu.
23025 Fortunately, PER_CU is stable for the life of the objfile. */
23027 struct dwarf2_per_cu_offset_and_type
23029 const struct dwarf2_per_cu_data *per_cu;
23030 sect_offset sect_off;
23034 /* Hash function for a dwarf2_per_cu_offset_and_type. */
23037 per_cu_offset_and_type_hash (const void *item)
23039 const struct dwarf2_per_cu_offset_and_type *ofs
23040 = (const struct dwarf2_per_cu_offset_and_type *) item;
23042 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
23045 /* Equality function for a dwarf2_per_cu_offset_and_type. */
23048 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
23050 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
23051 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
23052 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
23053 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
23055 return (ofs_lhs->per_cu == ofs_rhs->per_cu
23056 && ofs_lhs->sect_off == ofs_rhs->sect_off);
23059 /* Set the type associated with DIE to TYPE. Save it in CU's hash
23060 table if necessary. For convenience, return TYPE.
23062 The DIEs reading must have careful ordering to:
23063 * Not cause infite loops trying to read in DIEs as a prerequisite for
23064 reading current DIE.
23065 * Not trying to dereference contents of still incompletely read in types
23066 while reading in other DIEs.
23067 * Enable referencing still incompletely read in types just by a pointer to
23068 the type without accessing its fields.
23070 Therefore caller should follow these rules:
23071 * Try to fetch any prerequisite types we may need to build this DIE type
23072 before building the type and calling set_die_type.
23073 * After building type call set_die_type for current DIE as soon as
23074 possible before fetching more types to complete the current type.
23075 * Make the type as complete as possible before fetching more types. */
23077 static struct type *
23078 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
23080 struct dwarf2_per_cu_offset_and_type **slot, ofs;
23081 struct objfile *objfile = cu->objfile;
23082 struct attribute *attr;
23083 struct dynamic_prop prop;
23085 /* For Ada types, make sure that the gnat-specific data is always
23086 initialized (if not already set). There are a few types where
23087 we should not be doing so, because the type-specific area is
23088 already used to hold some other piece of info (eg: TYPE_CODE_FLT
23089 where the type-specific area is used to store the floatformat).
23090 But this is not a problem, because the gnat-specific information
23091 is actually not needed for these types. */
23092 if (need_gnat_info (cu)
23093 && TYPE_CODE (type) != TYPE_CODE_FUNC
23094 && TYPE_CODE (type) != TYPE_CODE_FLT
23095 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
23096 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
23097 && TYPE_CODE (type) != TYPE_CODE_METHOD
23098 && !HAVE_GNAT_AUX_INFO (type))
23099 INIT_GNAT_SPECIFIC (type);
23101 /* Read DW_AT_allocated and set in type. */
23102 attr = dwarf2_attr (die, DW_AT_allocated, cu);
23103 if (attr_form_is_block (attr))
23105 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23106 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type, objfile);
23108 else if (attr != NULL)
23110 complaint (&symfile_complaints,
23111 _("DW_AT_allocated has the wrong form (%s) at DIE 0x%x"),
23112 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23113 to_underlying (die->sect_off));
23116 /* Read DW_AT_associated and set in type. */
23117 attr = dwarf2_attr (die, DW_AT_associated, cu);
23118 if (attr_form_is_block (attr))
23120 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23121 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type, objfile);
23123 else if (attr != NULL)
23125 complaint (&symfile_complaints,
23126 _("DW_AT_associated has the wrong form (%s) at DIE 0x%x"),
23127 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23128 to_underlying (die->sect_off));
23131 /* Read DW_AT_data_location and set in type. */
23132 attr = dwarf2_attr (die, DW_AT_data_location, cu);
23133 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23134 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type, objfile);
23136 if (dwarf2_per_objfile->die_type_hash == NULL)
23138 dwarf2_per_objfile->die_type_hash =
23139 htab_create_alloc_ex (127,
23140 per_cu_offset_and_type_hash,
23141 per_cu_offset_and_type_eq,
23143 &objfile->objfile_obstack,
23144 hashtab_obstack_allocate,
23145 dummy_obstack_deallocate);
23148 ofs.per_cu = cu->per_cu;
23149 ofs.sect_off = die->sect_off;
23151 slot = (struct dwarf2_per_cu_offset_and_type **)
23152 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
23154 complaint (&symfile_complaints,
23155 _("A problem internal to GDB: DIE 0x%x has type already set"),
23156 to_underlying (die->sect_off));
23157 *slot = XOBNEW (&objfile->objfile_obstack,
23158 struct dwarf2_per_cu_offset_and_type);
23163 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
23164 or return NULL if the die does not have a saved type. */
23166 static struct type *
23167 get_die_type_at_offset (sect_offset sect_off,
23168 struct dwarf2_per_cu_data *per_cu)
23170 struct dwarf2_per_cu_offset_and_type *slot, ofs;
23172 if (dwarf2_per_objfile->die_type_hash == NULL)
23175 ofs.per_cu = per_cu;
23176 ofs.sect_off = sect_off;
23177 slot = ((struct dwarf2_per_cu_offset_and_type *)
23178 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
23185 /* Look up the type for DIE in CU in die_type_hash,
23186 or return NULL if DIE does not have a saved type. */
23188 static struct type *
23189 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
23191 return get_die_type_at_offset (die->sect_off, cu->per_cu);
23194 /* Add a dependence relationship from CU to REF_PER_CU. */
23197 dwarf2_add_dependence (struct dwarf2_cu *cu,
23198 struct dwarf2_per_cu_data *ref_per_cu)
23202 if (cu->dependencies == NULL)
23204 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
23205 NULL, &cu->comp_unit_obstack,
23206 hashtab_obstack_allocate,
23207 dummy_obstack_deallocate);
23209 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
23211 *slot = ref_per_cu;
23214 /* Subroutine of dwarf2_mark to pass to htab_traverse.
23215 Set the mark field in every compilation unit in the
23216 cache that we must keep because we are keeping CU. */
23219 dwarf2_mark_helper (void **slot, void *data)
23221 struct dwarf2_per_cu_data *per_cu;
23223 per_cu = (struct dwarf2_per_cu_data *) *slot;
23225 /* cu->dependencies references may not yet have been ever read if QUIT aborts
23226 reading of the chain. As such dependencies remain valid it is not much
23227 useful to track and undo them during QUIT cleanups. */
23228 if (per_cu->cu == NULL)
23231 if (per_cu->cu->mark)
23233 per_cu->cu->mark = 1;
23235 if (per_cu->cu->dependencies != NULL)
23236 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
23241 /* Set the mark field in CU and in every other compilation unit in the
23242 cache that we must keep because we are keeping CU. */
23245 dwarf2_mark (struct dwarf2_cu *cu)
23250 if (cu->dependencies != NULL)
23251 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
23255 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
23259 per_cu->cu->mark = 0;
23260 per_cu = per_cu->cu->read_in_chain;
23264 /* Trivial hash function for partial_die_info: the hash value of a DIE
23265 is its offset in .debug_info for this objfile. */
23268 partial_die_hash (const void *item)
23270 const struct partial_die_info *part_die
23271 = (const struct partial_die_info *) item;
23273 return to_underlying (part_die->sect_off);
23276 /* Trivial comparison function for partial_die_info structures: two DIEs
23277 are equal if they have the same offset. */
23280 partial_die_eq (const void *item_lhs, const void *item_rhs)
23282 const struct partial_die_info *part_die_lhs
23283 = (const struct partial_die_info *) item_lhs;
23284 const struct partial_die_info *part_die_rhs
23285 = (const struct partial_die_info *) item_rhs;
23287 return part_die_lhs->sect_off == part_die_rhs->sect_off;
23290 static struct cmd_list_element *set_dwarf_cmdlist;
23291 static struct cmd_list_element *show_dwarf_cmdlist;
23294 set_dwarf_cmd (char *args, int from_tty)
23296 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
23301 show_dwarf_cmd (char *args, int from_tty)
23303 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
23306 /* Free data associated with OBJFILE, if necessary. */
23309 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
23311 struct dwarf2_per_objfile *data = (struct dwarf2_per_objfile *) d;
23314 /* Make sure we don't accidentally use dwarf2_per_objfile while
23316 dwarf2_per_objfile = NULL;
23318 for (ix = 0; ix < data->n_comp_units; ++ix)
23319 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
23321 for (ix = 0; ix < data->n_type_units; ++ix)
23322 VEC_free (dwarf2_per_cu_ptr,
23323 data->all_type_units[ix]->per_cu.imported_symtabs);
23324 xfree (data->all_type_units);
23326 VEC_free (dwarf2_section_info_def, data->types);
23328 if (data->dwo_files)
23329 free_dwo_files (data->dwo_files, objfile);
23330 if (data->dwp_file)
23331 gdb_bfd_unref (data->dwp_file->dbfd);
23333 if (data->dwz_file && data->dwz_file->dwz_bfd)
23334 gdb_bfd_unref (data->dwz_file->dwz_bfd);
23338 /* The "save gdb-index" command. */
23340 /* In-memory buffer to prepare data to be written later to a file. */
23344 /* Copy DATA to the end of the buffer. */
23345 template<typename T>
23346 void append_data (const T &data)
23348 std::copy (reinterpret_cast<const gdb_byte *> (&data),
23349 reinterpret_cast<const gdb_byte *> (&data + 1),
23350 grow (sizeof (data)));
23353 /* Copy CSTR (a zero-terminated string) to the end of buffer. The
23354 terminating zero is appended too. */
23355 void append_cstr0 (const char *cstr)
23357 const size_t size = strlen (cstr) + 1;
23358 std::copy (cstr, cstr + size, grow (size));
23361 /* Accept a host-format integer in VAL and append it to the buffer
23362 as a target-format integer which is LEN bytes long. */
23363 void append_uint (size_t len, bfd_endian byte_order, ULONGEST val)
23365 ::store_unsigned_integer (grow (len), len, byte_order, val);
23368 /* Return the size of the buffer. */
23369 size_t size () const
23371 return m_vec.size ();
23374 /* Write the buffer to FILE. */
23375 void file_write (FILE *file) const
23377 if (::fwrite (m_vec.data (), 1, m_vec.size (), file) != m_vec.size ())
23378 error (_("couldn't write data to file"));
23382 /* Grow SIZE bytes at the end of the buffer. Returns a pointer to
23383 the start of the new block. */
23384 gdb_byte *grow (size_t size)
23386 m_vec.resize (m_vec.size () + size);
23387 return &*m_vec.end () - size;
23390 gdb::byte_vector m_vec;
23393 /* An entry in the symbol table. */
23394 struct symtab_index_entry
23396 /* The name of the symbol. */
23398 /* The offset of the name in the constant pool. */
23399 offset_type index_offset;
23400 /* A sorted vector of the indices of all the CUs that hold an object
23402 std::vector<offset_type> cu_indices;
23405 /* The symbol table. This is a power-of-2-sized hash table. */
23406 struct mapped_symtab
23410 data.resize (1024);
23413 offset_type n_elements = 0;
23414 std::vector<symtab_index_entry> data;
23417 /* Find a slot in SYMTAB for the symbol NAME. Returns a reference to
23420 Function is used only during write_hash_table so no index format backward
23421 compatibility is needed. */
23423 static symtab_index_entry &
23424 find_slot (struct mapped_symtab *symtab, const char *name)
23426 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
23428 index = hash & (symtab->data.size () - 1);
23429 step = ((hash * 17) & (symtab->data.size () - 1)) | 1;
23433 if (symtab->data[index].name == NULL
23434 || strcmp (name, symtab->data[index].name) == 0)
23435 return symtab->data[index];
23436 index = (index + step) & (symtab->data.size () - 1);
23440 /* Expand SYMTAB's hash table. */
23443 hash_expand (struct mapped_symtab *symtab)
23445 auto old_entries = std::move (symtab->data);
23447 symtab->data.clear ();
23448 symtab->data.resize (old_entries.size () * 2);
23450 for (auto &it : old_entries)
23451 if (it.name != NULL)
23453 auto &ref = find_slot (symtab, it.name);
23454 ref = std::move (it);
23458 /* Add an entry to SYMTAB. NAME is the name of the symbol.
23459 CU_INDEX is the index of the CU in which the symbol appears.
23460 IS_STATIC is one if the symbol is static, otherwise zero (global). */
23463 add_index_entry (struct mapped_symtab *symtab, const char *name,
23464 int is_static, gdb_index_symbol_kind kind,
23465 offset_type cu_index)
23467 offset_type cu_index_and_attrs;
23469 ++symtab->n_elements;
23470 if (4 * symtab->n_elements / 3 >= symtab->data.size ())
23471 hash_expand (symtab);
23473 symtab_index_entry &slot = find_slot (symtab, name);
23474 if (slot.name == NULL)
23477 /* index_offset is set later. */
23480 cu_index_and_attrs = 0;
23481 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
23482 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
23483 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
23485 /* We don't want to record an index value twice as we want to avoid the
23487 We process all global symbols and then all static symbols
23488 (which would allow us to avoid the duplication by only having to check
23489 the last entry pushed), but a symbol could have multiple kinds in one CU.
23490 To keep things simple we don't worry about the duplication here and
23491 sort and uniqufy the list after we've processed all symbols. */
23492 slot.cu_indices.push_back (cu_index_and_attrs);
23495 /* Sort and remove duplicates of all symbols' cu_indices lists. */
23498 uniquify_cu_indices (struct mapped_symtab *symtab)
23500 for (auto &entry : symtab->data)
23502 if (entry.name != NULL && !entry.cu_indices.empty ())
23504 auto &cu_indices = entry.cu_indices;
23505 std::sort (cu_indices.begin (), cu_indices.end ());
23506 auto from = std::unique (cu_indices.begin (), cu_indices.end ());
23507 cu_indices.erase (from, cu_indices.end ());
23512 /* A form of 'const char *' suitable for container keys. Only the
23513 pointer is stored. The strings themselves are compared, not the
23518 c_str_view (const char *cstr)
23522 bool operator== (const c_str_view &other) const
23524 return strcmp (m_cstr, other.m_cstr) == 0;
23528 friend class c_str_view_hasher;
23529 const char *const m_cstr;
23532 /* A std::unordered_map::hasher for c_str_view that uses the right
23533 hash function for strings in a mapped index. */
23534 class c_str_view_hasher
23537 size_t operator () (const c_str_view &x) const
23539 return mapped_index_string_hash (INT_MAX, x.m_cstr);
23543 /* A std::unordered_map::hasher for std::vector<>. */
23544 template<typename T>
23545 class vector_hasher
23548 size_t operator () (const std::vector<T> &key) const
23550 return iterative_hash (key.data (),
23551 sizeof (key.front ()) * key.size (), 0);
23555 /* Write the mapped hash table SYMTAB to the data buffer OUTPUT, with
23556 constant pool entries going into the data buffer CPOOL. */
23559 write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
23562 /* Elements are sorted vectors of the indices of all the CUs that
23563 hold an object of this name. */
23564 std::unordered_map<std::vector<offset_type>, offset_type,
23565 vector_hasher<offset_type>>
23568 /* We add all the index vectors to the constant pool first, to
23569 ensure alignment is ok. */
23570 for (symtab_index_entry &entry : symtab->data)
23572 if (entry.name == NULL)
23574 gdb_assert (entry.index_offset == 0);
23576 /* Finding before inserting is faster than always trying to
23577 insert, because inserting always allocates a node, does the
23578 lookup, and then destroys the new node if another node
23579 already had the same key. C++17 try_emplace will avoid
23582 = symbol_hash_table.find (entry.cu_indices);
23583 if (found != symbol_hash_table.end ())
23585 entry.index_offset = found->second;
23589 symbol_hash_table.emplace (entry.cu_indices, cpool.size ());
23590 entry.index_offset = cpool.size ();
23591 cpool.append_data (MAYBE_SWAP (entry.cu_indices.size ()));
23592 for (const auto index : entry.cu_indices)
23593 cpool.append_data (MAYBE_SWAP (index));
23597 /* Now write out the hash table. */
23598 std::unordered_map<c_str_view, offset_type, c_str_view_hasher> str_table;
23599 for (const auto &entry : symtab->data)
23601 offset_type str_off, vec_off;
23603 if (entry.name != NULL)
23605 const auto insertpair = str_table.emplace (entry.name, cpool.size ());
23606 if (insertpair.second)
23607 cpool.append_cstr0 (entry.name);
23608 str_off = insertpair.first->second;
23609 vec_off = entry.index_offset;
23613 /* While 0 is a valid constant pool index, it is not valid
23614 to have 0 for both offsets. */
23619 output.append_data (MAYBE_SWAP (str_off));
23620 output.append_data (MAYBE_SWAP (vec_off));
23624 typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
23626 /* Helper struct for building the address table. */
23627 struct addrmap_index_data
23629 addrmap_index_data (data_buf &addr_vec_, psym_index_map &cu_index_htab_)
23630 : addr_vec (addr_vec_), cu_index_htab (cu_index_htab_)
23633 struct objfile *objfile;
23634 data_buf &addr_vec;
23635 psym_index_map &cu_index_htab;
23637 /* Non-zero if the previous_* fields are valid.
23638 We can't write an entry until we see the next entry (since it is only then
23639 that we know the end of the entry). */
23640 int previous_valid;
23641 /* Index of the CU in the table of all CUs in the index file. */
23642 unsigned int previous_cu_index;
23643 /* Start address of the CU. */
23644 CORE_ADDR previous_cu_start;
23647 /* Write an address entry to ADDR_VEC. */
23650 add_address_entry (struct objfile *objfile, data_buf &addr_vec,
23651 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
23653 CORE_ADDR baseaddr;
23655 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
23657 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, start - baseaddr);
23658 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, end - baseaddr);
23659 addr_vec.append_data (MAYBE_SWAP (cu_index));
23662 /* Worker function for traversing an addrmap to build the address table. */
23665 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
23667 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
23668 struct partial_symtab *pst = (struct partial_symtab *) obj;
23670 if (data->previous_valid)
23671 add_address_entry (data->objfile, data->addr_vec,
23672 data->previous_cu_start, start_addr,
23673 data->previous_cu_index);
23675 data->previous_cu_start = start_addr;
23678 const auto it = data->cu_index_htab.find (pst);
23679 gdb_assert (it != data->cu_index_htab.cend ());
23680 data->previous_cu_index = it->second;
23681 data->previous_valid = 1;
23684 data->previous_valid = 0;
23689 /* Write OBJFILE's address map to ADDR_VEC.
23690 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
23691 in the index file. */
23694 write_address_map (struct objfile *objfile, data_buf &addr_vec,
23695 psym_index_map &cu_index_htab)
23697 struct addrmap_index_data addrmap_index_data (addr_vec, cu_index_htab);
23699 /* When writing the address table, we have to cope with the fact that
23700 the addrmap iterator only provides the start of a region; we have to
23701 wait until the next invocation to get the start of the next region. */
23703 addrmap_index_data.objfile = objfile;
23704 addrmap_index_data.previous_valid = 0;
23706 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
23707 &addrmap_index_data);
23709 /* It's highly unlikely the last entry (end address = 0xff...ff)
23710 is valid, but we should still handle it.
23711 The end address is recorded as the start of the next region, but that
23712 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
23714 if (addrmap_index_data.previous_valid)
23715 add_address_entry (objfile, addr_vec,
23716 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
23717 addrmap_index_data.previous_cu_index);
23720 /* Return the symbol kind of PSYM. */
23722 static gdb_index_symbol_kind
23723 symbol_kind (struct partial_symbol *psym)
23725 domain_enum domain = PSYMBOL_DOMAIN (psym);
23726 enum address_class aclass = PSYMBOL_CLASS (psym);
23734 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
23736 return GDB_INDEX_SYMBOL_KIND_TYPE;
23738 case LOC_CONST_BYTES:
23739 case LOC_OPTIMIZED_OUT:
23741 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23743 /* Note: It's currently impossible to recognize psyms as enum values
23744 short of reading the type info. For now punt. */
23745 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
23747 /* There are other LOC_FOO values that one might want to classify
23748 as variables, but dwarf2read.c doesn't currently use them. */
23749 return GDB_INDEX_SYMBOL_KIND_OTHER;
23751 case STRUCT_DOMAIN:
23752 return GDB_INDEX_SYMBOL_KIND_TYPE;
23754 return GDB_INDEX_SYMBOL_KIND_OTHER;
23758 /* Add a list of partial symbols to SYMTAB. */
23761 write_psymbols (struct mapped_symtab *symtab,
23762 std::unordered_set<partial_symbol *> &psyms_seen,
23763 struct partial_symbol **psymp,
23765 offset_type cu_index,
23768 for (; count-- > 0; ++psymp)
23770 struct partial_symbol *psym = *psymp;
23772 if (SYMBOL_LANGUAGE (psym) == language_ada)
23773 error (_("Ada is not currently supported by the index"));
23775 /* Only add a given psymbol once. */
23776 if (psyms_seen.insert (psym).second)
23778 gdb_index_symbol_kind kind = symbol_kind (psym);
23780 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
23781 is_static, kind, cu_index);
23786 /* A helper struct used when iterating over debug_types. */
23787 struct signatured_type_index_data
23789 signatured_type_index_data (data_buf &types_list_,
23790 std::unordered_set<partial_symbol *> &psyms_seen_)
23791 : types_list (types_list_), psyms_seen (psyms_seen_)
23794 struct objfile *objfile;
23795 struct mapped_symtab *symtab;
23796 data_buf &types_list;
23797 std::unordered_set<partial_symbol *> &psyms_seen;
23801 /* A helper function that writes a single signatured_type to an
23805 write_one_signatured_type (void **slot, void *d)
23807 struct signatured_type_index_data *info
23808 = (struct signatured_type_index_data *) d;
23809 struct signatured_type *entry = (struct signatured_type *) *slot;
23810 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
23812 write_psymbols (info->symtab,
23814 info->objfile->global_psymbols.list
23815 + psymtab->globals_offset,
23816 psymtab->n_global_syms, info->cu_index,
23818 write_psymbols (info->symtab,
23820 info->objfile->static_psymbols.list
23821 + psymtab->statics_offset,
23822 psymtab->n_static_syms, info->cu_index,
23825 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
23826 to_underlying (entry->per_cu.sect_off));
23827 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
23828 to_underlying (entry->type_offset_in_tu));
23829 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE, entry->signature);
23836 /* Recurse into all "included" dependencies and count their symbols as
23837 if they appeared in this psymtab. */
23840 recursively_count_psymbols (struct partial_symtab *psymtab,
23841 size_t &psyms_seen)
23843 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
23844 if (psymtab->dependencies[i]->user != NULL)
23845 recursively_count_psymbols (psymtab->dependencies[i],
23848 psyms_seen += psymtab->n_global_syms;
23849 psyms_seen += psymtab->n_static_syms;
23852 /* Recurse into all "included" dependencies and write their symbols as
23853 if they appeared in this psymtab. */
23856 recursively_write_psymbols (struct objfile *objfile,
23857 struct partial_symtab *psymtab,
23858 struct mapped_symtab *symtab,
23859 std::unordered_set<partial_symbol *> &psyms_seen,
23860 offset_type cu_index)
23864 for (i = 0; i < psymtab->number_of_dependencies; ++i)
23865 if (psymtab->dependencies[i]->user != NULL)
23866 recursively_write_psymbols (objfile, psymtab->dependencies[i],
23867 symtab, psyms_seen, cu_index);
23869 write_psymbols (symtab,
23871 objfile->global_psymbols.list + psymtab->globals_offset,
23872 psymtab->n_global_syms, cu_index,
23874 write_psymbols (symtab,
23876 objfile->static_psymbols.list + psymtab->statics_offset,
23877 psymtab->n_static_syms, cu_index,
23881 /* Create an index file for OBJFILE in the directory DIR. */
23884 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
23886 if (dwarf2_per_objfile->using_index)
23887 error (_("Cannot use an index to create the index"));
23889 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
23890 error (_("Cannot make an index when the file has multiple .debug_types sections"));
23892 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
23896 if (stat (objfile_name (objfile), &st) < 0)
23897 perror_with_name (objfile_name (objfile));
23899 std::string filename (std::string (dir) + SLASH_STRING
23900 + lbasename (objfile_name (objfile)) + INDEX_SUFFIX);
23902 FILE *out_file = gdb_fopen_cloexec (filename.c_str (), "wb").release ();
23904 error (_("Can't open `%s' for writing"), filename.c_str ());
23906 /* Order matters here; we want FILE to be closed before FILENAME is
23907 unlinked, because on MS-Windows one cannot delete a file that is
23908 still open. (Don't call anything here that might throw until
23909 file_closer is created.) */
23910 gdb::unlinker unlink_file (filename.c_str ());
23911 gdb_file_up close_out_file (out_file);
23913 mapped_symtab symtab;
23916 /* While we're scanning CU's create a table that maps a psymtab pointer
23917 (which is what addrmap records) to its index (which is what is recorded
23918 in the index file). This will later be needed to write the address
23920 psym_index_map cu_index_htab;
23921 cu_index_htab.reserve (dwarf2_per_objfile->n_comp_units);
23923 /* The CU list is already sorted, so we don't need to do additional
23924 work here. Also, the debug_types entries do not appear in
23925 all_comp_units, but only in their own hash table. */
23927 /* The psyms_seen set is potentially going to be largish (~40k
23928 elements when indexing a -g3 build of GDB itself). Estimate the
23929 number of elements in order to avoid too many rehashes, which
23930 require rebuilding buckets and thus many trips to
23932 size_t psyms_count = 0;
23933 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
23935 struct dwarf2_per_cu_data *per_cu
23936 = dwarf2_per_objfile->all_comp_units[i];
23937 struct partial_symtab *psymtab = per_cu->v.psymtab;
23939 if (psymtab != NULL && psymtab->user == NULL)
23940 recursively_count_psymbols (psymtab, psyms_count);
23942 /* Generating an index for gdb itself shows a ratio of
23943 TOTAL_SEEN_SYMS/UNIQUE_SYMS or ~5. 4 seems like a good bet. */
23944 std::unordered_set<partial_symbol *> psyms_seen (psyms_count / 4);
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 /* CU of a shared file from 'dwz -m' may be unused by this main file.
23952 It may be referenced from a local scope but in such case it does not
23953 need to be present in .gdb_index. */
23954 if (psymtab == NULL)
23957 if (psymtab->user == NULL)
23958 recursively_write_psymbols (objfile, psymtab, &symtab,
23961 const auto insertpair = cu_index_htab.emplace (psymtab, i);
23962 gdb_assert (insertpair.second);
23964 cu_list.append_uint (8, BFD_ENDIAN_LITTLE,
23965 to_underlying (per_cu->sect_off));
23966 cu_list.append_uint (8, BFD_ENDIAN_LITTLE, per_cu->length);
23969 /* Dump the address map. */
23971 write_address_map (objfile, addr_vec, cu_index_htab);
23973 /* Write out the .debug_type entries, if any. */
23974 data_buf types_cu_list;
23975 if (dwarf2_per_objfile->signatured_types)
23977 signatured_type_index_data sig_data (types_cu_list,
23980 sig_data.objfile = objfile;
23981 sig_data.symtab = &symtab;
23982 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
23983 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
23984 write_one_signatured_type, &sig_data);
23987 /* Now that we've processed all symbols we can shrink their cu_indices
23989 uniquify_cu_indices (&symtab);
23991 data_buf symtab_vec, constant_pool;
23992 write_hash_table (&symtab, symtab_vec, constant_pool);
23995 const offset_type size_of_contents = 6 * sizeof (offset_type);
23996 offset_type total_len = size_of_contents;
23998 /* The version number. */
23999 contents.append_data (MAYBE_SWAP (8));
24001 /* The offset of the CU list from the start of the file. */
24002 contents.append_data (MAYBE_SWAP (total_len));
24003 total_len += cu_list.size ();
24005 /* The offset of the types CU list from the start of the file. */
24006 contents.append_data (MAYBE_SWAP (total_len));
24007 total_len += types_cu_list.size ();
24009 /* The offset of the address table from the start of the file. */
24010 contents.append_data (MAYBE_SWAP (total_len));
24011 total_len += addr_vec.size ();
24013 /* The offset of the symbol table from the start of the file. */
24014 contents.append_data (MAYBE_SWAP (total_len));
24015 total_len += symtab_vec.size ();
24017 /* The offset of the constant pool from the start of the file. */
24018 contents.append_data (MAYBE_SWAP (total_len));
24019 total_len += constant_pool.size ();
24021 gdb_assert (contents.size () == size_of_contents);
24023 contents.file_write (out_file);
24024 cu_list.file_write (out_file);
24025 types_cu_list.file_write (out_file);
24026 addr_vec.file_write (out_file);
24027 symtab_vec.file_write (out_file);
24028 constant_pool.file_write (out_file);
24030 /* We want to keep the file. */
24031 unlink_file.keep ();
24034 /* Implementation of the `save gdb-index' command.
24036 Note that the file format used by this command is documented in the
24037 GDB manual. Any changes here must be documented there. */
24040 save_gdb_index_command (char *arg, int from_tty)
24042 struct objfile *objfile;
24045 error (_("usage: save gdb-index DIRECTORY"));
24047 ALL_OBJFILES (objfile)
24051 /* If the objfile does not correspond to an actual file, skip it. */
24052 if (stat (objfile_name (objfile), &st) < 0)
24056 = (struct dwarf2_per_objfile *) objfile_data (objfile,
24057 dwarf2_objfile_data_key);
24058 if (dwarf2_per_objfile)
24063 write_psymtabs_to_index (objfile, arg);
24065 CATCH (except, RETURN_MASK_ERROR)
24067 exception_fprintf (gdb_stderr, except,
24068 _("Error while writing index for `%s': "),
24069 objfile_name (objfile));
24078 int dwarf_always_disassemble;
24081 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
24082 struct cmd_list_element *c, const char *value)
24084 fprintf_filtered (file,
24085 _("Whether to always disassemble "
24086 "DWARF expressions is %s.\n"),
24091 show_check_physname (struct ui_file *file, int from_tty,
24092 struct cmd_list_element *c, const char *value)
24094 fprintf_filtered (file,
24095 _("Whether to check \"physname\" is %s.\n"),
24099 void _initialize_dwarf2_read (void);
24102 _initialize_dwarf2_read (void)
24104 struct cmd_list_element *c;
24106 dwarf2_objfile_data_key
24107 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
24109 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
24110 Set DWARF specific variables.\n\
24111 Configure DWARF variables such as the cache size"),
24112 &set_dwarf_cmdlist, "maintenance set dwarf ",
24113 0/*allow-unknown*/, &maintenance_set_cmdlist);
24115 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
24116 Show DWARF specific variables\n\
24117 Show DWARF variables such as the cache size"),
24118 &show_dwarf_cmdlist, "maintenance show dwarf ",
24119 0/*allow-unknown*/, &maintenance_show_cmdlist);
24121 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
24122 &dwarf_max_cache_age, _("\
24123 Set the upper bound on the age of cached DWARF compilation units."), _("\
24124 Show the upper bound on the age of cached DWARF compilation units."), _("\
24125 A higher limit means that cached compilation units will be stored\n\
24126 in memory longer, and more total memory will be used. Zero disables\n\
24127 caching, which can slow down startup."),
24129 show_dwarf_max_cache_age,
24130 &set_dwarf_cmdlist,
24131 &show_dwarf_cmdlist);
24133 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
24134 &dwarf_always_disassemble, _("\
24135 Set whether `info address' always disassembles DWARF expressions."), _("\
24136 Show whether `info address' always disassembles DWARF expressions."), _("\
24137 When enabled, DWARF expressions are always printed in an assembly-like\n\
24138 syntax. When disabled, expressions will be printed in a more\n\
24139 conversational style, when possible."),
24141 show_dwarf_always_disassemble,
24142 &set_dwarf_cmdlist,
24143 &show_dwarf_cmdlist);
24145 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
24146 Set debugging of the DWARF reader."), _("\
24147 Show debugging of the DWARF reader."), _("\
24148 When enabled (non-zero), debugging messages are printed during DWARF\n\
24149 reading and symtab expansion. A value of 1 (one) provides basic\n\
24150 information. A value greater than 1 provides more verbose information."),
24153 &setdebuglist, &showdebuglist);
24155 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
24156 Set debugging of the DWARF DIE reader."), _("\
24157 Show debugging of the DWARF DIE reader."), _("\
24158 When enabled (non-zero), DIEs are dumped after they are read in.\n\
24159 The value is the maximum depth to print."),
24162 &setdebuglist, &showdebuglist);
24164 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
24165 Set debugging of the dwarf line reader."), _("\
24166 Show debugging of the dwarf line reader."), _("\
24167 When enabled (non-zero), line number entries are dumped as they are read in.\n\
24168 A value of 1 (one) provides basic information.\n\
24169 A value greater than 1 provides more verbose information."),
24172 &setdebuglist, &showdebuglist);
24174 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
24175 Set cross-checking of \"physname\" code against demangler."), _("\
24176 Show cross-checking of \"physname\" code against demangler."), _("\
24177 When enabled, GDB's internal \"physname\" code is checked against\n\
24179 NULL, show_check_physname,
24180 &setdebuglist, &showdebuglist);
24182 add_setshow_boolean_cmd ("use-deprecated-index-sections",
24183 no_class, &use_deprecated_index_sections, _("\
24184 Set whether to use deprecated gdb_index sections."), _("\
24185 Show whether to use deprecated gdb_index sections."), _("\
24186 When enabled, deprecated .gdb_index sections are used anyway.\n\
24187 Normally they are ignored either because of a missing feature or\n\
24188 performance issue.\n\
24189 Warning: This option must be enabled before gdb reads the file."),
24192 &setlist, &showlist);
24194 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
24196 Save a gdb-index file.\n\
24197 Usage: save gdb-index DIRECTORY"),
24199 set_cmd_completer (c, filename_completer);
24201 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
24202 &dwarf2_locexpr_funcs);
24203 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
24204 &dwarf2_loclist_funcs);
24206 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
24207 &dwarf2_block_frame_base_locexpr_funcs);
24208 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
24209 &dwarf2_block_frame_base_loclist_funcs);