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"
80 #include <sys/types.h>
82 #include <unordered_set>
83 #include <unordered_map>
86 /* When == 1, print basic high level tracing messages.
87 When > 1, be more verbose.
88 This is in contrast to the low level DIE reading of dwarf_die_debug. */
89 static unsigned int dwarf_read_debug = 0;
91 /* When non-zero, dump DIEs after they are read in. */
92 static unsigned int dwarf_die_debug = 0;
94 /* When non-zero, dump line number entries as they are read in. */
95 static unsigned int dwarf_line_debug = 0;
97 /* When non-zero, cross-check physname against demangler. */
98 static int check_physname = 0;
100 /* When non-zero, do not reject deprecated .gdb_index sections. */
101 static int use_deprecated_index_sections = 0;
103 static const struct objfile_data *dwarf2_objfile_data_key;
105 /* The "aclass" indices for various kinds of computed DWARF symbols. */
107 static int dwarf2_locexpr_index;
108 static int dwarf2_loclist_index;
109 static int dwarf2_locexpr_block_index;
110 static int dwarf2_loclist_block_index;
112 /* A descriptor for dwarf sections.
114 S.ASECTION, SIZE are typically initialized when the objfile is first
115 scanned. BUFFER, READIN are filled in later when the section is read.
116 If the section contained compressed data then SIZE is updated to record
117 the uncompressed size of the section.
119 DWP file format V2 introduces a wrinkle that is easiest to handle by
120 creating the concept of virtual sections contained within a real section.
121 In DWP V2 the sections of the input DWO files are concatenated together
122 into one section, but section offsets are kept relative to the original
124 If this is a virtual dwp-v2 section, S.CONTAINING_SECTION is a backlink to
125 the real section this "virtual" section is contained in, and BUFFER,SIZE
126 describe the virtual section. */
128 struct dwarf2_section_info
132 /* If this is a real section, the bfd section. */
134 /* If this is a virtual section, pointer to the containing ("real")
136 struct dwarf2_section_info *containing_section;
138 /* Pointer to section data, only valid if readin. */
139 const gdb_byte *buffer;
140 /* The size of the section, real or virtual. */
142 /* If this is a virtual section, the offset in the real section.
143 Only valid if is_virtual. */
144 bfd_size_type virtual_offset;
145 /* True if we have tried to read this section. */
147 /* True if this is a virtual section, False otherwise.
148 This specifies which of s.section and s.containing_section to use. */
152 typedef struct dwarf2_section_info dwarf2_section_info_def;
153 DEF_VEC_O (dwarf2_section_info_def);
155 /* All offsets in the index are of this type. It must be
156 architecture-independent. */
157 typedef uint32_t offset_type;
159 DEF_VEC_I (offset_type);
161 /* Ensure only legit values are used. */
162 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
164 gdb_assert ((unsigned int) (value) <= 1); \
165 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
168 /* Ensure only legit values are used. */
169 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
171 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
172 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
173 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
176 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
177 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
179 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
180 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
185 /* Convert VALUE between big- and little-endian. */
188 byte_swap (offset_type value)
192 result = (value & 0xff) << 24;
193 result |= (value & 0xff00) << 8;
194 result |= (value & 0xff0000) >> 8;
195 result |= (value & 0xff000000) >> 24;
199 #define MAYBE_SWAP(V) byte_swap (V)
202 #define MAYBE_SWAP(V) static_cast<offset_type> (V)
203 #endif /* WORDS_BIGENDIAN */
205 /* An index into a (C++) symbol name component in a symbol name as
206 recorded in the mapped_index's symbol table. For each C++ symbol
207 in the symbol table, we record one entry for the start of each
208 component in the symbol in a table of name components, and then
209 sort the table, in order to be able to binary search symbol names,
210 ignoring leading namespaces, both completion and regular look up.
211 For example, for symbol "A::B::C", we'll have an entry that points
212 to "A::B::C", another that points to "B::C", and another for "C".
213 Note that function symbols in GDB index have no parameter
214 information, just the function/method names. You can convert a
215 name_component to a "const char *" using the
216 'mapped_index::symbol_name_at(offset_type)' method. */
218 struct name_component
220 /* Offset in the symbol name where the component starts. Stored as
221 a (32-bit) offset instead of a pointer to save memory and improve
222 locality on 64-bit architectures. */
223 offset_type name_offset;
225 /* The symbol's index in the symbol and constant pool tables of a
230 /* A description of the mapped index. The file format is described in
231 a comment by the code that writes the index. */
234 /* Index data format version. */
237 /* The total length of the buffer. */
240 /* A pointer to the address table data. */
241 const gdb_byte *address_table;
243 /* Size of the address table data in bytes. */
244 offset_type address_table_size;
246 /* The symbol table, implemented as a hash table. */
247 const offset_type *symbol_table;
249 /* Size in slots, each slot is 2 offset_types. */
250 offset_type symbol_table_slots;
252 /* A pointer to the constant pool. */
253 const char *constant_pool;
255 /* The name_component table (a sorted vector). See name_component's
256 description above. */
257 std::vector<name_component> name_components;
259 /* Convenience method to get at the name of the symbol at IDX in the
261 const char *symbol_name_at (offset_type idx) const
262 { return this->constant_pool + MAYBE_SWAP (this->symbol_table[idx]); }
265 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
266 DEF_VEC_P (dwarf2_per_cu_ptr);
270 int nr_uniq_abbrev_tables;
272 int nr_symtab_sharers;
273 int nr_stmt_less_type_units;
274 int nr_all_type_units_reallocs;
277 /* Collection of data recorded per objfile.
278 This hangs off of dwarf2_objfile_data_key. */
280 struct dwarf2_per_objfile
282 /* Construct a dwarf2_per_objfile for OBJFILE. NAMES points to the
283 dwarf2 section names, or is NULL if the standard ELF names are
285 dwarf2_per_objfile (struct objfile *objfile,
286 const dwarf2_debug_sections *names);
288 ~dwarf2_per_objfile ();
290 DISABLE_COPY_AND_ASSIGN (dwarf2_per_objfile);
292 /* Free all cached compilation units. */
293 void free_cached_comp_units ();
295 /* This function is mapped across the sections and remembers the
296 offset and size of each of the debugging sections we are
298 void locate_sections (bfd *abfd, asection *sectp,
299 const dwarf2_debug_sections &names);
302 dwarf2_section_info info {};
303 dwarf2_section_info abbrev {};
304 dwarf2_section_info line {};
305 dwarf2_section_info loc {};
306 dwarf2_section_info loclists {};
307 dwarf2_section_info macinfo {};
308 dwarf2_section_info macro {};
309 dwarf2_section_info str {};
310 dwarf2_section_info line_str {};
311 dwarf2_section_info ranges {};
312 dwarf2_section_info rnglists {};
313 dwarf2_section_info addr {};
314 dwarf2_section_info frame {};
315 dwarf2_section_info eh_frame {};
316 dwarf2_section_info gdb_index {};
318 VEC (dwarf2_section_info_def) *types = NULL;
321 struct objfile *objfile = NULL;
323 /* Table of all the compilation units. This is used to locate
324 the target compilation unit of a particular reference. */
325 struct dwarf2_per_cu_data **all_comp_units = NULL;
327 /* The number of compilation units in ALL_COMP_UNITS. */
328 int n_comp_units = 0;
330 /* The number of .debug_types-related CUs. */
331 int n_type_units = 0;
333 /* The number of elements allocated in all_type_units.
334 If there are skeleton-less TUs, we add them to all_type_units lazily. */
335 int n_allocated_type_units = 0;
337 /* The .debug_types-related CUs (TUs).
338 This is stored in malloc space because we may realloc it. */
339 struct signatured_type **all_type_units = NULL;
341 /* Table of struct type_unit_group objects.
342 The hash key is the DW_AT_stmt_list value. */
343 htab_t type_unit_groups {};
345 /* A table mapping .debug_types signatures to its signatured_type entry.
346 This is NULL if the .debug_types section hasn't been read in yet. */
347 htab_t signatured_types {};
349 /* Type unit statistics, to see how well the scaling improvements
351 struct tu_stats tu_stats {};
353 /* A chain of compilation units that are currently read in, so that
354 they can be freed later. */
355 dwarf2_per_cu_data *read_in_chain = NULL;
357 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
358 This is NULL if the table hasn't been allocated yet. */
361 /* True if we've checked for whether there is a DWP file. */
362 bool dwp_checked = false;
364 /* The DWP file if there is one, or NULL. */
365 struct dwp_file *dwp_file = NULL;
367 /* The shared '.dwz' file, if one exists. This is used when the
368 original data was compressed using 'dwz -m'. */
369 struct dwz_file *dwz_file = NULL;
371 /* A flag indicating whether this objfile has a section loaded at a
373 bool has_section_at_zero = false;
375 /* True if we are using the mapped index,
376 or we are faking it for OBJF_READNOW's sake. */
377 bool using_index = false;
379 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
380 mapped_index *index_table = NULL;
382 /* When using index_table, this keeps track of all quick_file_names entries.
383 TUs typically share line table entries with a CU, so we maintain a
384 separate table of all line table entries to support the sharing.
385 Note that while there can be way more TUs than CUs, we've already
386 sorted all the TUs into "type unit groups", grouped by their
387 DW_AT_stmt_list value. Therefore the only sharing done here is with a
388 CU and its associated TU group if there is one. */
389 htab_t quick_file_names_table {};
391 /* Set during partial symbol reading, to prevent queueing of full
393 bool reading_partial_symbols = false;
395 /* Table mapping type DIEs to their struct type *.
396 This is NULL if not allocated yet.
397 The mapping is done via (CU/TU + DIE offset) -> type. */
398 htab_t die_type_hash {};
400 /* The CUs we recently read. */
401 VEC (dwarf2_per_cu_ptr) *just_read_cus = NULL;
403 /* Table containing line_header indexed by offset and offset_in_dwz. */
404 htab_t line_header_hash {};
406 /* Table containing all filenames. This is an optional because the
407 table is lazily constructed on first access. */
408 gdb::optional<filename_seen_cache> filenames_cache;
411 static struct dwarf2_per_objfile *dwarf2_per_objfile;
413 /* Default names of the debugging sections. */
415 /* Note that if the debugging section has been compressed, it might
416 have a name like .zdebug_info. */
418 static const struct dwarf2_debug_sections dwarf2_elf_names =
420 { ".debug_info", ".zdebug_info" },
421 { ".debug_abbrev", ".zdebug_abbrev" },
422 { ".debug_line", ".zdebug_line" },
423 { ".debug_loc", ".zdebug_loc" },
424 { ".debug_loclists", ".zdebug_loclists" },
425 { ".debug_macinfo", ".zdebug_macinfo" },
426 { ".debug_macro", ".zdebug_macro" },
427 { ".debug_str", ".zdebug_str" },
428 { ".debug_line_str", ".zdebug_line_str" },
429 { ".debug_ranges", ".zdebug_ranges" },
430 { ".debug_rnglists", ".zdebug_rnglists" },
431 { ".debug_types", ".zdebug_types" },
432 { ".debug_addr", ".zdebug_addr" },
433 { ".debug_frame", ".zdebug_frame" },
434 { ".eh_frame", NULL },
435 { ".gdb_index", ".zgdb_index" },
439 /* List of DWO/DWP sections. */
441 static const struct dwop_section_names
443 struct dwarf2_section_names abbrev_dwo;
444 struct dwarf2_section_names info_dwo;
445 struct dwarf2_section_names line_dwo;
446 struct dwarf2_section_names loc_dwo;
447 struct dwarf2_section_names loclists_dwo;
448 struct dwarf2_section_names macinfo_dwo;
449 struct dwarf2_section_names macro_dwo;
450 struct dwarf2_section_names str_dwo;
451 struct dwarf2_section_names str_offsets_dwo;
452 struct dwarf2_section_names types_dwo;
453 struct dwarf2_section_names cu_index;
454 struct dwarf2_section_names tu_index;
458 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
459 { ".debug_info.dwo", ".zdebug_info.dwo" },
460 { ".debug_line.dwo", ".zdebug_line.dwo" },
461 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
462 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
463 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
464 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
465 { ".debug_str.dwo", ".zdebug_str.dwo" },
466 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
467 { ".debug_types.dwo", ".zdebug_types.dwo" },
468 { ".debug_cu_index", ".zdebug_cu_index" },
469 { ".debug_tu_index", ".zdebug_tu_index" },
472 /* local data types */
474 /* The data in a compilation unit header, after target2host
475 translation, looks like this. */
476 struct comp_unit_head
480 unsigned char addr_size;
481 unsigned char signed_addr_p;
482 sect_offset abbrev_sect_off;
484 /* Size of file offsets; either 4 or 8. */
485 unsigned int offset_size;
487 /* Size of the length field; either 4 or 12. */
488 unsigned int initial_length_size;
490 enum dwarf_unit_type unit_type;
492 /* Offset to the first byte of this compilation unit header in the
493 .debug_info section, for resolving relative reference dies. */
494 sect_offset sect_off;
496 /* Offset to first die in this cu from the start of the cu.
497 This will be the first byte following the compilation unit header. */
498 cu_offset first_die_cu_offset;
500 /* 64-bit signature of this type unit - it is valid only for
501 UNIT_TYPE DW_UT_type. */
504 /* For types, offset in the type's DIE of the type defined by this TU. */
505 cu_offset type_cu_offset_in_tu;
508 /* Type used for delaying computation of method physnames.
509 See comments for compute_delayed_physnames. */
510 struct delayed_method_info
512 /* The type to which the method is attached, i.e., its parent class. */
515 /* The index of the method in the type's function fieldlists. */
518 /* The index of the method in the fieldlist. */
521 /* The name of the DIE. */
524 /* The DIE associated with this method. */
525 struct die_info *die;
528 typedef struct delayed_method_info delayed_method_info;
529 DEF_VEC_O (delayed_method_info);
531 /* Internal state when decoding a particular compilation unit. */
534 /* The objfile containing this compilation unit. */
535 struct objfile *objfile;
537 /* The header of the compilation unit. */
538 struct comp_unit_head header;
540 /* Base address of this compilation unit. */
541 CORE_ADDR base_address;
543 /* Non-zero if base_address has been set. */
546 /* The language we are debugging. */
547 enum language language;
548 const struct language_defn *language_defn;
550 const char *producer;
552 /* The generic symbol table building routines have separate lists for
553 file scope symbols and all all other scopes (local scopes). So
554 we need to select the right one to pass to add_symbol_to_list().
555 We do it by keeping a pointer to the correct list in list_in_scope.
557 FIXME: The original dwarf code just treated the file scope as the
558 first local scope, and all other local scopes as nested local
559 scopes, and worked fine. Check to see if we really need to
560 distinguish these in buildsym.c. */
561 struct pending **list_in_scope;
563 /* The abbrev table for this CU.
564 Normally this points to the abbrev table in the objfile.
565 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
566 struct abbrev_table *abbrev_table;
568 /* Hash table holding all the loaded partial DIEs
569 with partial_die->offset.SECT_OFF as hash. */
572 /* Storage for things with the same lifetime as this read-in compilation
573 unit, including partial DIEs. */
574 struct obstack comp_unit_obstack;
576 /* When multiple dwarf2_cu structures are living in memory, this field
577 chains them all together, so that they can be released efficiently.
578 We will probably also want a generation counter so that most-recently-used
579 compilation units are cached... */
580 struct dwarf2_per_cu_data *read_in_chain;
582 /* Backlink to our per_cu entry. */
583 struct dwarf2_per_cu_data *per_cu;
585 /* How many compilation units ago was this CU last referenced? */
588 /* A hash table of DIE cu_offset for following references with
589 die_info->offset.sect_off as hash. */
592 /* Full DIEs if read in. */
593 struct die_info *dies;
595 /* A set of pointers to dwarf2_per_cu_data objects for compilation
596 units referenced by this one. Only set during full symbol processing;
597 partial symbol tables do not have dependencies. */
600 /* Header data from the line table, during full symbol processing. */
601 struct line_header *line_header;
602 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
603 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
604 this is the DW_TAG_compile_unit die for this CU. We'll hold on
605 to the line header as long as this DIE is being processed. See
606 process_die_scope. */
607 die_info *line_header_die_owner;
609 /* A list of methods which need to have physnames computed
610 after all type information has been read. */
611 VEC (delayed_method_info) *method_list;
613 /* To be copied to symtab->call_site_htab. */
614 htab_t call_site_htab;
616 /* Non-NULL if this CU came from a DWO file.
617 There is an invariant here that is important to remember:
618 Except for attributes copied from the top level DIE in the "main"
619 (or "stub") file in preparation for reading the DWO file
620 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
621 Either there isn't a DWO file (in which case this is NULL and the point
622 is moot), or there is and either we're not going to read it (in which
623 case this is NULL) or there is and we are reading it (in which case this
625 struct dwo_unit *dwo_unit;
627 /* The DW_AT_addr_base attribute if present, zero otherwise
628 (zero is a valid value though).
629 Note this value comes from the Fission stub CU/TU's DIE. */
632 /* The DW_AT_ranges_base attribute if present, zero otherwise
633 (zero is a valid value though).
634 Note this value comes from the Fission stub CU/TU's DIE.
635 Also note that the value is zero in the non-DWO case so this value can
636 be used without needing to know whether DWO files are in use or not.
637 N.B. This does not apply to DW_AT_ranges appearing in
638 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
639 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
640 DW_AT_ranges_base *would* have to be applied, and we'd have to care
641 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
642 ULONGEST ranges_base;
644 /* Mark used when releasing cached dies. */
645 unsigned int mark : 1;
647 /* This CU references .debug_loc. See the symtab->locations_valid field.
648 This test is imperfect as there may exist optimized debug code not using
649 any location list and still facing inlining issues if handled as
650 unoptimized code. For a future better test see GCC PR other/32998. */
651 unsigned int has_loclist : 1;
653 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
654 if all the producer_is_* fields are valid. This information is cached
655 because profiling CU expansion showed excessive time spent in
656 producer_is_gxx_lt_4_6. */
657 unsigned int checked_producer : 1;
658 unsigned int producer_is_gxx_lt_4_6 : 1;
659 unsigned int producer_is_gcc_lt_4_3 : 1;
660 unsigned int producer_is_icc_lt_14 : 1;
662 /* When set, the file that we're processing is known to have
663 debugging info for C++ namespaces. GCC 3.3.x did not produce
664 this information, but later versions do. */
666 unsigned int processing_has_namespace_info : 1;
669 /* Persistent data held for a compilation unit, even when not
670 processing it. We put a pointer to this structure in the
671 read_symtab_private field of the psymtab. */
673 struct dwarf2_per_cu_data
675 /* The start offset and length of this compilation unit.
676 NOTE: Unlike comp_unit_head.length, this length includes
678 If the DIE refers to a DWO file, this is always of the original die,
680 sect_offset sect_off;
683 /* DWARF standard version this data has been read from (such as 4 or 5). */
686 /* Flag indicating this compilation unit will be read in before
687 any of the current compilation units are processed. */
688 unsigned int queued : 1;
690 /* This flag will be set when reading partial DIEs if we need to load
691 absolutely all DIEs for this compilation unit, instead of just the ones
692 we think are interesting. It gets set if we look for a DIE in the
693 hash table and don't find it. */
694 unsigned int load_all_dies : 1;
696 /* Non-zero if this CU is from .debug_types.
697 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
699 unsigned int is_debug_types : 1;
701 /* Non-zero if this CU is from the .dwz file. */
702 unsigned int is_dwz : 1;
704 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
705 This flag is only valid if is_debug_types is true.
706 We can't read a CU directly from a DWO file: There are required
707 attributes in the stub. */
708 unsigned int reading_dwo_directly : 1;
710 /* Non-zero if the TU has been read.
711 This is used to assist the "Stay in DWO Optimization" for Fission:
712 When reading a DWO, it's faster to read TUs from the DWO instead of
713 fetching them from random other DWOs (due to comdat folding).
714 If the TU has already been read, the optimization is unnecessary
715 (and unwise - we don't want to change where gdb thinks the TU lives
717 This flag is only valid if is_debug_types is true. */
718 unsigned int tu_read : 1;
720 /* The section this CU/TU lives in.
721 If the DIE refers to a DWO file, this is always the original die,
723 struct dwarf2_section_info *section;
725 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
726 of the CU cache it gets reset to NULL again. This is left as NULL for
727 dummy CUs (a CU header, but nothing else). */
728 struct dwarf2_cu *cu;
730 /* The corresponding objfile.
731 Normally we can get the objfile from dwarf2_per_objfile.
732 However we can enter this file with just a "per_cu" handle. */
733 struct objfile *objfile;
735 /* When dwarf2_per_objfile->using_index is true, the 'quick' field
736 is active. Otherwise, the 'psymtab' field is active. */
739 /* The partial symbol table associated with this compilation unit,
740 or NULL for unread partial units. */
741 struct partial_symtab *psymtab;
743 /* Data needed by the "quick" functions. */
744 struct dwarf2_per_cu_quick_data *quick;
747 /* The CUs we import using DW_TAG_imported_unit. This is filled in
748 while reading psymtabs, used to compute the psymtab dependencies,
749 and then cleared. Then it is filled in again while reading full
750 symbols, and only deleted when the objfile is destroyed.
752 This is also used to work around a difference between the way gold
753 generates .gdb_index version <=7 and the way gdb does. Arguably this
754 is a gold bug. For symbols coming from TUs, gold records in the index
755 the CU that includes the TU instead of the TU itself. This breaks
756 dw2_lookup_symbol: It assumes that if the index says symbol X lives
757 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
758 will find X. Alas TUs live in their own symtab, so after expanding CU Y
759 we need to look in TU Z to find X. Fortunately, this is akin to
760 DW_TAG_imported_unit, so we just use the same mechanism: For
761 .gdb_index version <=7 this also records the TUs that the CU referred
762 to. Concurrently with this change gdb was modified to emit version 8
763 indices so we only pay a price for gold generated indices.
764 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
765 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
768 /* Entry in the signatured_types hash table. */
770 struct signatured_type
772 /* The "per_cu" object of this type.
773 This struct is used iff per_cu.is_debug_types.
774 N.B.: This is the first member so that it's easy to convert pointers
776 struct dwarf2_per_cu_data per_cu;
778 /* The type's signature. */
781 /* Offset in the TU of the type's DIE, as read from the TU header.
782 If this TU is a DWO stub and the definition lives in a DWO file
783 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
784 cu_offset type_offset_in_tu;
786 /* Offset in the section of the type's DIE.
787 If the definition lives in a DWO file, this is the offset in the
788 .debug_types.dwo section.
789 The value is zero until the actual value is known.
790 Zero is otherwise not a valid section offset. */
791 sect_offset type_offset_in_section;
793 /* Type units are grouped by their DW_AT_stmt_list entry so that they
794 can share them. This points to the containing symtab. */
795 struct type_unit_group *type_unit_group;
798 The first time we encounter this type we fully read it in and install it
799 in the symbol tables. Subsequent times we only need the type. */
802 /* Containing DWO unit.
803 This field is valid iff per_cu.reading_dwo_directly. */
804 struct dwo_unit *dwo_unit;
807 typedef struct signatured_type *sig_type_ptr;
808 DEF_VEC_P (sig_type_ptr);
810 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
811 This includes type_unit_group and quick_file_names. */
813 struct stmt_list_hash
815 /* The DWO unit this table is from or NULL if there is none. */
816 struct dwo_unit *dwo_unit;
818 /* Offset in .debug_line or .debug_line.dwo. */
819 sect_offset line_sect_off;
822 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
823 an object of this type. */
825 struct type_unit_group
827 /* dwarf2read.c's main "handle" on a TU symtab.
828 To simplify things we create an artificial CU that "includes" all the
829 type units using this stmt_list so that the rest of the code still has
830 a "per_cu" handle on the symtab.
831 This PER_CU is recognized by having no section. */
832 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
833 struct dwarf2_per_cu_data per_cu;
835 /* The TUs that share this DW_AT_stmt_list entry.
836 This is added to while parsing type units to build partial symtabs,
837 and is deleted afterwards and not used again. */
838 VEC (sig_type_ptr) *tus;
840 /* The compunit symtab.
841 Type units in a group needn't all be defined in the same source file,
842 so we create an essentially anonymous symtab as the compunit symtab. */
843 struct compunit_symtab *compunit_symtab;
845 /* The data used to construct the hash key. */
846 struct stmt_list_hash hash;
848 /* The number of symtabs from the line header.
849 The value here must match line_header.num_file_names. */
850 unsigned int num_symtabs;
852 /* The symbol tables for this TU (obtained from the files listed in
854 WARNING: The order of entries here must match the order of entries
855 in the line header. After the first TU using this type_unit_group, the
856 line header for the subsequent TUs is recreated from this. This is done
857 because we need to use the same symtabs for each TU using the same
858 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
859 there's no guarantee the line header doesn't have duplicate entries. */
860 struct symtab **symtabs;
863 /* These sections are what may appear in a (real or virtual) DWO file. */
867 struct dwarf2_section_info abbrev;
868 struct dwarf2_section_info line;
869 struct dwarf2_section_info loc;
870 struct dwarf2_section_info loclists;
871 struct dwarf2_section_info macinfo;
872 struct dwarf2_section_info macro;
873 struct dwarf2_section_info str;
874 struct dwarf2_section_info str_offsets;
875 /* In the case of a virtual DWO file, these two are unused. */
876 struct dwarf2_section_info info;
877 VEC (dwarf2_section_info_def) *types;
880 /* CUs/TUs in DWP/DWO files. */
884 /* Backlink to the containing struct dwo_file. */
885 struct dwo_file *dwo_file;
887 /* The "id" that distinguishes this CU/TU.
888 .debug_info calls this "dwo_id", .debug_types calls this "signature".
889 Since signatures came first, we stick with it for consistency. */
892 /* The section this CU/TU lives in, in the DWO file. */
893 struct dwarf2_section_info *section;
895 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
896 sect_offset sect_off;
899 /* For types, offset in the type's DIE of the type defined by this TU. */
900 cu_offset type_offset_in_tu;
903 /* include/dwarf2.h defines the DWP section codes.
904 It defines a max value but it doesn't define a min value, which we
905 use for error checking, so provide one. */
907 enum dwp_v2_section_ids
912 /* Data for one DWO file.
914 This includes virtual DWO files (a virtual DWO file is a DWO file as it
915 appears in a DWP file). DWP files don't really have DWO files per se -
916 comdat folding of types "loses" the DWO file they came from, and from
917 a high level view DWP files appear to contain a mass of random types.
918 However, to maintain consistency with the non-DWP case we pretend DWP
919 files contain virtual DWO files, and we assign each TU with one virtual
920 DWO file (generally based on the line and abbrev section offsets -
921 a heuristic that seems to work in practice). */
925 /* The DW_AT_GNU_dwo_name attribute.
926 For virtual DWO files the name is constructed from the section offsets
927 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
928 from related CU+TUs. */
929 const char *dwo_name;
931 /* The DW_AT_comp_dir attribute. */
932 const char *comp_dir;
934 /* The bfd, when the file is open. Otherwise this is NULL.
935 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
938 /* The sections that make up this DWO file.
939 Remember that for virtual DWO files in DWP V2, these are virtual
940 sections (for lack of a better name). */
941 struct dwo_sections sections;
943 /* The CUs in the file.
944 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
945 an extension to handle LLVM's Link Time Optimization output (where
946 multiple source files may be compiled into a single object/dwo pair). */
949 /* Table of TUs in the file.
950 Each element is a struct dwo_unit. */
954 /* These sections are what may appear in a DWP file. */
958 /* These are used by both DWP version 1 and 2. */
959 struct dwarf2_section_info str;
960 struct dwarf2_section_info cu_index;
961 struct dwarf2_section_info tu_index;
963 /* These are only used by DWP version 2 files.
964 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
965 sections are referenced by section number, and are not recorded here.
966 In DWP version 2 there is at most one copy of all these sections, each
967 section being (effectively) comprised of the concatenation of all of the
968 individual sections that exist in the version 1 format.
969 To keep the code simple we treat each of these concatenated pieces as a
970 section itself (a virtual section?). */
971 struct dwarf2_section_info abbrev;
972 struct dwarf2_section_info info;
973 struct dwarf2_section_info line;
974 struct dwarf2_section_info loc;
975 struct dwarf2_section_info macinfo;
976 struct dwarf2_section_info macro;
977 struct dwarf2_section_info str_offsets;
978 struct dwarf2_section_info types;
981 /* These sections are what may appear in a virtual DWO file in DWP version 1.
982 A virtual DWO file is a DWO file as it appears in a DWP file. */
984 struct virtual_v1_dwo_sections
986 struct dwarf2_section_info abbrev;
987 struct dwarf2_section_info line;
988 struct dwarf2_section_info loc;
989 struct dwarf2_section_info macinfo;
990 struct dwarf2_section_info macro;
991 struct dwarf2_section_info str_offsets;
992 /* Each DWP hash table entry records one CU or one TU.
993 That is recorded here, and copied to dwo_unit.section. */
994 struct dwarf2_section_info info_or_types;
997 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
998 In version 2, the sections of the DWO files are concatenated together
999 and stored in one section of that name. Thus each ELF section contains
1000 several "virtual" sections. */
1002 struct virtual_v2_dwo_sections
1004 bfd_size_type abbrev_offset;
1005 bfd_size_type abbrev_size;
1007 bfd_size_type line_offset;
1008 bfd_size_type line_size;
1010 bfd_size_type loc_offset;
1011 bfd_size_type loc_size;
1013 bfd_size_type macinfo_offset;
1014 bfd_size_type macinfo_size;
1016 bfd_size_type macro_offset;
1017 bfd_size_type macro_size;
1019 bfd_size_type str_offsets_offset;
1020 bfd_size_type str_offsets_size;
1022 /* Each DWP hash table entry records one CU or one TU.
1023 That is recorded here, and copied to dwo_unit.section. */
1024 bfd_size_type info_or_types_offset;
1025 bfd_size_type info_or_types_size;
1028 /* Contents of DWP hash tables. */
1030 struct dwp_hash_table
1032 uint32_t version, nr_columns;
1033 uint32_t nr_units, nr_slots;
1034 const gdb_byte *hash_table, *unit_table;
1039 const gdb_byte *indices;
1043 /* This is indexed by column number and gives the id of the section
1045 #define MAX_NR_V2_DWO_SECTIONS \
1046 (1 /* .debug_info or .debug_types */ \
1047 + 1 /* .debug_abbrev */ \
1048 + 1 /* .debug_line */ \
1049 + 1 /* .debug_loc */ \
1050 + 1 /* .debug_str_offsets */ \
1051 + 1 /* .debug_macro or .debug_macinfo */)
1052 int section_ids[MAX_NR_V2_DWO_SECTIONS];
1053 const gdb_byte *offsets;
1054 const gdb_byte *sizes;
1059 /* Data for one DWP file. */
1063 /* Name of the file. */
1066 /* File format version. */
1072 /* Section info for this file. */
1073 struct dwp_sections sections;
1075 /* Table of CUs in the file. */
1076 const struct dwp_hash_table *cus;
1078 /* Table of TUs in the file. */
1079 const struct dwp_hash_table *tus;
1081 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
1085 /* Table to map ELF section numbers to their sections.
1086 This is only needed for the DWP V1 file format. */
1087 unsigned int num_sections;
1088 asection **elf_sections;
1091 /* This represents a '.dwz' file. */
1095 /* A dwz file can only contain a few sections. */
1096 struct dwarf2_section_info abbrev;
1097 struct dwarf2_section_info info;
1098 struct dwarf2_section_info str;
1099 struct dwarf2_section_info line;
1100 struct dwarf2_section_info macro;
1101 struct dwarf2_section_info gdb_index;
1103 /* The dwz's BFD. */
1107 /* Struct used to pass misc. parameters to read_die_and_children, et
1108 al. which are used for both .debug_info and .debug_types dies.
1109 All parameters here are unchanging for the life of the call. This
1110 struct exists to abstract away the constant parameters of die reading. */
1112 struct die_reader_specs
1114 /* The bfd of die_section. */
1117 /* The CU of the DIE we are parsing. */
1118 struct dwarf2_cu *cu;
1120 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
1121 struct dwo_file *dwo_file;
1123 /* The section the die comes from.
1124 This is either .debug_info or .debug_types, or the .dwo variants. */
1125 struct dwarf2_section_info *die_section;
1127 /* die_section->buffer. */
1128 const gdb_byte *buffer;
1130 /* The end of the buffer. */
1131 const gdb_byte *buffer_end;
1133 /* The value of the DW_AT_comp_dir attribute. */
1134 const char *comp_dir;
1137 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1138 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1139 const gdb_byte *info_ptr,
1140 struct die_info *comp_unit_die,
1144 /* A 1-based directory index. This is a strong typedef to prevent
1145 accidentally using a directory index as a 0-based index into an
1147 enum class dir_index : unsigned int {};
1149 /* Likewise, a 1-based file name index. */
1150 enum class file_name_index : unsigned int {};
1154 file_entry () = default;
1156 file_entry (const char *name_, dir_index d_index_,
1157 unsigned int mod_time_, unsigned int length_)
1160 mod_time (mod_time_),
1164 /* Return the include directory at D_INDEX stored in LH. Returns
1165 NULL if D_INDEX is out of bounds. */
1166 const char *include_dir (const line_header *lh) const;
1168 /* The file name. Note this is an observing pointer. The memory is
1169 owned by debug_line_buffer. */
1170 const char *name {};
1172 /* The directory index (1-based). */
1173 dir_index d_index {};
1175 unsigned int mod_time {};
1177 unsigned int length {};
1179 /* True if referenced by the Line Number Program. */
1182 /* The associated symbol table, if any. */
1183 struct symtab *symtab {};
1186 /* The line number information for a compilation unit (found in the
1187 .debug_line section) begins with a "statement program header",
1188 which contains the following information. */
1195 /* Add an entry to the include directory table. */
1196 void add_include_dir (const char *include_dir);
1198 /* Add an entry to the file name table. */
1199 void add_file_name (const char *name, dir_index d_index,
1200 unsigned int mod_time, unsigned int length);
1202 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
1203 is out of bounds. */
1204 const char *include_dir_at (dir_index index) const
1206 /* Convert directory index number (1-based) to vector index
1208 size_t vec_index = to_underlying (index) - 1;
1210 if (vec_index >= include_dirs.size ())
1212 return include_dirs[vec_index];
1215 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
1216 is out of bounds. */
1217 file_entry *file_name_at (file_name_index index)
1219 /* Convert file name index number (1-based) to vector index
1221 size_t vec_index = to_underlying (index) - 1;
1223 if (vec_index >= file_names.size ())
1225 return &file_names[vec_index];
1228 /* Const version of the above. */
1229 const file_entry *file_name_at (unsigned int index) const
1231 if (index >= file_names.size ())
1233 return &file_names[index];
1236 /* Offset of line number information in .debug_line section. */
1237 sect_offset sect_off {};
1239 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1240 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1242 unsigned int total_length {};
1243 unsigned short version {};
1244 unsigned int header_length {};
1245 unsigned char minimum_instruction_length {};
1246 unsigned char maximum_ops_per_instruction {};
1247 unsigned char default_is_stmt {};
1249 unsigned char line_range {};
1250 unsigned char opcode_base {};
1252 /* standard_opcode_lengths[i] is the number of operands for the
1253 standard opcode whose value is i. This means that
1254 standard_opcode_lengths[0] is unused, and the last meaningful
1255 element is standard_opcode_lengths[opcode_base - 1]. */
1256 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1258 /* The include_directories table. Note these are observing
1259 pointers. The memory is owned by debug_line_buffer. */
1260 std::vector<const char *> include_dirs;
1262 /* The file_names table. */
1263 std::vector<file_entry> file_names;
1265 /* The start and end of the statement program following this
1266 header. These point into dwarf2_per_objfile->line_buffer. */
1267 const gdb_byte *statement_program_start {}, *statement_program_end {};
1270 typedef std::unique_ptr<line_header> line_header_up;
1273 file_entry::include_dir (const line_header *lh) const
1275 return lh->include_dir_at (d_index);
1278 /* When we construct a partial symbol table entry we only
1279 need this much information. */
1280 struct partial_die_info
1282 /* Offset of this DIE. */
1283 sect_offset sect_off;
1285 /* DWARF-2 tag for this DIE. */
1286 ENUM_BITFIELD(dwarf_tag) tag : 16;
1288 /* Assorted flags describing the data found in this DIE. */
1289 unsigned int has_children : 1;
1290 unsigned int is_external : 1;
1291 unsigned int is_declaration : 1;
1292 unsigned int has_type : 1;
1293 unsigned int has_specification : 1;
1294 unsigned int has_pc_info : 1;
1295 unsigned int may_be_inlined : 1;
1297 /* This DIE has been marked DW_AT_main_subprogram. */
1298 unsigned int main_subprogram : 1;
1300 /* Flag set if the SCOPE field of this structure has been
1302 unsigned int scope_set : 1;
1304 /* Flag set if the DIE has a byte_size attribute. */
1305 unsigned int has_byte_size : 1;
1307 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1308 unsigned int has_const_value : 1;
1310 /* Flag set if any of the DIE's children are template arguments. */
1311 unsigned int has_template_arguments : 1;
1313 /* Flag set if fixup_partial_die has been called on this die. */
1314 unsigned int fixup_called : 1;
1316 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1317 unsigned int is_dwz : 1;
1319 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1320 unsigned int spec_is_dwz : 1;
1322 /* The name of this DIE. Normally the value of DW_AT_name, but
1323 sometimes a default name for unnamed DIEs. */
1326 /* The linkage name, if present. */
1327 const char *linkage_name;
1329 /* The scope to prepend to our children. This is generally
1330 allocated on the comp_unit_obstack, so will disappear
1331 when this compilation unit leaves the cache. */
1334 /* Some data associated with the partial DIE. The tag determines
1335 which field is live. */
1338 /* The location description associated with this DIE, if any. */
1339 struct dwarf_block *locdesc;
1340 /* The offset of an import, for DW_TAG_imported_unit. */
1341 sect_offset sect_off;
1344 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1348 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1349 DW_AT_sibling, if any. */
1350 /* NOTE: This member isn't strictly necessary, read_partial_die could
1351 return DW_AT_sibling values to its caller load_partial_dies. */
1352 const gdb_byte *sibling;
1354 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1355 DW_AT_specification (or DW_AT_abstract_origin or
1356 DW_AT_extension). */
1357 sect_offset spec_offset;
1359 /* Pointers to this DIE's parent, first child, and next sibling,
1361 struct partial_die_info *die_parent, *die_child, *die_sibling;
1364 /* This data structure holds the information of an abbrev. */
1367 unsigned int number; /* number identifying abbrev */
1368 enum dwarf_tag tag; /* dwarf tag */
1369 unsigned short has_children; /* boolean */
1370 unsigned short num_attrs; /* number of attributes */
1371 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1372 struct abbrev_info *next; /* next in chain */
1377 ENUM_BITFIELD(dwarf_attribute) name : 16;
1378 ENUM_BITFIELD(dwarf_form) form : 16;
1380 /* It is valid only if FORM is DW_FORM_implicit_const. */
1381 LONGEST implicit_const;
1384 /* Size of abbrev_table.abbrev_hash_table. */
1385 #define ABBREV_HASH_SIZE 121
1387 /* Top level data structure to contain an abbreviation table. */
1391 /* Where the abbrev table came from.
1392 This is used as a sanity check when the table is used. */
1393 sect_offset sect_off;
1395 /* Storage for the abbrev table. */
1396 struct obstack abbrev_obstack;
1398 /* Hash table of abbrevs.
1399 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1400 It could be statically allocated, but the previous code didn't so we
1402 struct abbrev_info **abbrevs;
1405 /* Attributes have a name and a value. */
1408 ENUM_BITFIELD(dwarf_attribute) name : 16;
1409 ENUM_BITFIELD(dwarf_form) form : 15;
1411 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1412 field should be in u.str (existing only for DW_STRING) but it is kept
1413 here for better struct attribute alignment. */
1414 unsigned int string_is_canonical : 1;
1419 struct dwarf_block *blk;
1428 /* This data structure holds a complete die structure. */
1431 /* DWARF-2 tag for this DIE. */
1432 ENUM_BITFIELD(dwarf_tag) tag : 16;
1434 /* Number of attributes */
1435 unsigned char num_attrs;
1437 /* True if we're presently building the full type name for the
1438 type derived from this DIE. */
1439 unsigned char building_fullname : 1;
1441 /* True if this die is in process. PR 16581. */
1442 unsigned char in_process : 1;
1445 unsigned int abbrev;
1447 /* Offset in .debug_info or .debug_types section. */
1448 sect_offset sect_off;
1450 /* The dies in a compilation unit form an n-ary tree. PARENT
1451 points to this die's parent; CHILD points to the first child of
1452 this node; and all the children of a given node are chained
1453 together via their SIBLING fields. */
1454 struct die_info *child; /* Its first child, if any. */
1455 struct die_info *sibling; /* Its next sibling, if any. */
1456 struct die_info *parent; /* Its parent, if any. */
1458 /* An array of attributes, with NUM_ATTRS elements. There may be
1459 zero, but it's not common and zero-sized arrays are not
1460 sufficiently portable C. */
1461 struct attribute attrs[1];
1464 /* Get at parts of an attribute structure. */
1466 #define DW_STRING(attr) ((attr)->u.str)
1467 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1468 #define DW_UNSND(attr) ((attr)->u.unsnd)
1469 #define DW_BLOCK(attr) ((attr)->u.blk)
1470 #define DW_SND(attr) ((attr)->u.snd)
1471 #define DW_ADDR(attr) ((attr)->u.addr)
1472 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1474 /* Blocks are a bunch of untyped bytes. */
1479 /* Valid only if SIZE is not zero. */
1480 const gdb_byte *data;
1483 #ifndef ATTR_ALLOC_CHUNK
1484 #define ATTR_ALLOC_CHUNK 4
1487 /* Allocate fields for structs, unions and enums in this size. */
1488 #ifndef DW_FIELD_ALLOC_CHUNK
1489 #define DW_FIELD_ALLOC_CHUNK 4
1492 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1493 but this would require a corresponding change in unpack_field_as_long
1495 static int bits_per_byte = 8;
1499 struct nextfield *next;
1507 struct nextfnfield *next;
1508 struct fn_field fnfield;
1515 struct nextfnfield *head;
1518 struct typedef_field_list
1520 struct typedef_field field;
1521 struct typedef_field_list *next;
1524 /* The routines that read and process dies for a C struct or C++ class
1525 pass lists of data member fields and lists of member function fields
1526 in an instance of a field_info structure, as defined below. */
1529 /* List of data member and baseclasses fields. */
1530 struct nextfield *fields, *baseclasses;
1532 /* Number of fields (including baseclasses). */
1535 /* Number of baseclasses. */
1538 /* Set if the accesibility of one of the fields is not public. */
1539 int non_public_fields;
1541 /* Member function fieldlist array, contains name of possibly overloaded
1542 member function, number of overloaded member functions and a pointer
1543 to the head of the member function field chain. */
1544 struct fnfieldlist *fnfieldlists;
1546 /* Number of entries in the fnfieldlists array. */
1549 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1550 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1551 struct typedef_field_list *typedef_field_list;
1552 unsigned typedef_field_list_count;
1555 /* One item on the queue of compilation units to read in full symbols
1557 struct dwarf2_queue_item
1559 struct dwarf2_per_cu_data *per_cu;
1560 enum language pretend_language;
1561 struct dwarf2_queue_item *next;
1564 /* The current queue. */
1565 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1567 /* Loaded secondary compilation units are kept in memory until they
1568 have not been referenced for the processing of this many
1569 compilation units. Set this to zero to disable caching. Cache
1570 sizes of up to at least twenty will improve startup time for
1571 typical inter-CU-reference binaries, at an obvious memory cost. */
1572 static int dwarf_max_cache_age = 5;
1574 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1575 struct cmd_list_element *c, const char *value)
1577 fprintf_filtered (file, _("The upper bound on the age of cached "
1578 "DWARF compilation units is %s.\n"),
1582 /* local function prototypes */
1584 static const char *get_section_name (const struct dwarf2_section_info *);
1586 static const char *get_section_file_name (const struct dwarf2_section_info *);
1588 static void dwarf2_find_base_address (struct die_info *die,
1589 struct dwarf2_cu *cu);
1591 static struct partial_symtab *create_partial_symtab
1592 (struct dwarf2_per_cu_data *per_cu, const char *name);
1594 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1595 const gdb_byte *info_ptr,
1596 struct die_info *type_unit_die,
1597 int has_children, void *data);
1599 static void dwarf2_build_psymtabs_hard (struct objfile *);
1601 static void scan_partial_symbols (struct partial_die_info *,
1602 CORE_ADDR *, CORE_ADDR *,
1603 int, struct dwarf2_cu *);
1605 static void add_partial_symbol (struct partial_die_info *,
1606 struct dwarf2_cu *);
1608 static void add_partial_namespace (struct partial_die_info *pdi,
1609 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1610 int set_addrmap, struct dwarf2_cu *cu);
1612 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1613 CORE_ADDR *highpc, int set_addrmap,
1614 struct dwarf2_cu *cu);
1616 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1617 struct dwarf2_cu *cu);
1619 static void add_partial_subprogram (struct partial_die_info *pdi,
1620 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1621 int need_pc, struct dwarf2_cu *cu);
1623 static void dwarf2_read_symtab (struct partial_symtab *,
1626 static void psymtab_to_symtab_1 (struct partial_symtab *);
1628 static struct abbrev_info *abbrev_table_lookup_abbrev
1629 (const struct abbrev_table *, unsigned int);
1631 static struct abbrev_table *abbrev_table_read_table
1632 (struct dwarf2_section_info *, sect_offset);
1634 static void abbrev_table_free (struct abbrev_table *);
1636 static void abbrev_table_free_cleanup (void *);
1638 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1639 struct dwarf2_section_info *);
1641 static void dwarf2_free_abbrev_table (void *);
1643 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1645 static struct partial_die_info *load_partial_dies
1646 (const struct die_reader_specs *, const gdb_byte *, int);
1648 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1649 struct partial_die_info *,
1650 struct abbrev_info *,
1654 static struct partial_die_info *find_partial_die (sect_offset, int,
1655 struct dwarf2_cu *);
1657 static void fixup_partial_die (struct partial_die_info *,
1658 struct dwarf2_cu *);
1660 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1661 struct attribute *, struct attr_abbrev *,
1664 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1666 static int read_1_signed_byte (bfd *, const gdb_byte *);
1668 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1670 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1672 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1674 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1677 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1679 static LONGEST read_checked_initial_length_and_offset
1680 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1681 unsigned int *, unsigned int *);
1683 static LONGEST read_offset (bfd *, const gdb_byte *,
1684 const struct comp_unit_head *,
1687 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1689 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1692 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1694 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1696 static const char *read_indirect_string (bfd *, const gdb_byte *,
1697 const struct comp_unit_head *,
1700 static const char *read_indirect_line_string (bfd *, const gdb_byte *,
1701 const struct comp_unit_head *,
1704 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1706 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1708 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1712 static const char *read_str_index (const struct die_reader_specs *reader,
1713 ULONGEST str_index);
1715 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1717 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1718 struct dwarf2_cu *);
1720 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1723 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1724 struct dwarf2_cu *cu);
1726 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1727 struct dwarf2_cu *cu);
1729 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1731 static struct die_info *die_specification (struct die_info *die,
1732 struct dwarf2_cu **);
1734 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1735 struct dwarf2_cu *cu);
1737 static void dwarf_decode_lines (struct line_header *, const char *,
1738 struct dwarf2_cu *, struct partial_symtab *,
1739 CORE_ADDR, int decode_mapping);
1741 static void dwarf2_start_subfile (const char *, const char *);
1743 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1744 const char *, const char *,
1747 static struct symbol *new_symbol (struct die_info *, struct type *,
1748 struct dwarf2_cu *);
1750 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1751 struct dwarf2_cu *, struct symbol *);
1753 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1754 struct dwarf2_cu *);
1756 static void dwarf2_const_value_attr (const struct attribute *attr,
1759 struct obstack *obstack,
1760 struct dwarf2_cu *cu, LONGEST *value,
1761 const gdb_byte **bytes,
1762 struct dwarf2_locexpr_baton **baton);
1764 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1766 static int need_gnat_info (struct dwarf2_cu *);
1768 static struct type *die_descriptive_type (struct die_info *,
1769 struct dwarf2_cu *);
1771 static void set_descriptive_type (struct type *, struct die_info *,
1772 struct dwarf2_cu *);
1774 static struct type *die_containing_type (struct die_info *,
1775 struct dwarf2_cu *);
1777 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1778 struct dwarf2_cu *);
1780 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1782 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1784 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1786 static char *typename_concat (struct obstack *obs, const char *prefix,
1787 const char *suffix, int physname,
1788 struct dwarf2_cu *cu);
1790 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1792 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1794 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1796 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1798 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1800 static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
1802 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1803 struct dwarf2_cu *, struct partial_symtab *);
1805 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1806 values. Keep the items ordered with increasing constraints compliance. */
1809 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1810 PC_BOUNDS_NOT_PRESENT,
1812 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1813 were present but they do not form a valid range of PC addresses. */
1816 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1819 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1823 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1824 CORE_ADDR *, CORE_ADDR *,
1826 struct partial_symtab *);
1828 static void get_scope_pc_bounds (struct die_info *,
1829 CORE_ADDR *, CORE_ADDR *,
1830 struct dwarf2_cu *);
1832 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1833 CORE_ADDR, struct dwarf2_cu *);
1835 static void dwarf2_add_field (struct field_info *, struct die_info *,
1836 struct dwarf2_cu *);
1838 static void dwarf2_attach_fields_to_type (struct field_info *,
1839 struct type *, struct dwarf2_cu *);
1841 static void dwarf2_add_member_fn (struct field_info *,
1842 struct die_info *, struct type *,
1843 struct dwarf2_cu *);
1845 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1847 struct dwarf2_cu *);
1849 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1851 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1853 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1855 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1857 static struct using_direct **using_directives (enum language);
1859 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1861 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1863 static struct type *read_module_type (struct die_info *die,
1864 struct dwarf2_cu *cu);
1866 static const char *namespace_name (struct die_info *die,
1867 int *is_anonymous, struct dwarf2_cu *);
1869 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1871 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1873 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1874 struct dwarf2_cu *);
1876 static struct die_info *read_die_and_siblings_1
1877 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1880 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1881 const gdb_byte *info_ptr,
1882 const gdb_byte **new_info_ptr,
1883 struct die_info *parent);
1885 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1886 struct die_info **, const gdb_byte *,
1889 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1890 struct die_info **, const gdb_byte *,
1893 static void process_die (struct die_info *, struct dwarf2_cu *);
1895 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1898 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1900 static const char *dwarf2_full_name (const char *name,
1901 struct die_info *die,
1902 struct dwarf2_cu *cu);
1904 static const char *dwarf2_physname (const char *name, struct die_info *die,
1905 struct dwarf2_cu *cu);
1907 static struct die_info *dwarf2_extension (struct die_info *die,
1908 struct dwarf2_cu **);
1910 static const char *dwarf_tag_name (unsigned int);
1912 static const char *dwarf_attr_name (unsigned int);
1914 static const char *dwarf_form_name (unsigned int);
1916 static const char *dwarf_bool_name (unsigned int);
1918 static const char *dwarf_type_encoding_name (unsigned int);
1920 static struct die_info *sibling_die (struct die_info *);
1922 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1924 static void dump_die_for_error (struct die_info *);
1926 static void dump_die_1 (struct ui_file *, int level, int max_level,
1929 /*static*/ void dump_die (struct die_info *, int max_level);
1931 static void store_in_ref_table (struct die_info *,
1932 struct dwarf2_cu *);
1934 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1936 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1938 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1939 const struct attribute *,
1940 struct dwarf2_cu **);
1942 static struct die_info *follow_die_ref (struct die_info *,
1943 const struct attribute *,
1944 struct dwarf2_cu **);
1946 static struct die_info *follow_die_sig (struct die_info *,
1947 const struct attribute *,
1948 struct dwarf2_cu **);
1950 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1951 struct dwarf2_cu *);
1953 static struct type *get_DW_AT_signature_type (struct die_info *,
1954 const struct attribute *,
1955 struct dwarf2_cu *);
1957 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1959 static void read_signatured_type (struct signatured_type *);
1961 static int attr_to_dynamic_prop (const struct attribute *attr,
1962 struct die_info *die, struct dwarf2_cu *cu,
1963 struct dynamic_prop *prop);
1965 /* memory allocation interface */
1967 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1969 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1971 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1973 static int attr_form_is_block (const struct attribute *);
1975 static int attr_form_is_section_offset (const struct attribute *);
1977 static int attr_form_is_constant (const struct attribute *);
1979 static int attr_form_is_ref (const struct attribute *);
1981 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1982 struct dwarf2_loclist_baton *baton,
1983 const struct attribute *attr);
1985 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1987 struct dwarf2_cu *cu,
1990 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1991 const gdb_byte *info_ptr,
1992 struct abbrev_info *abbrev);
1994 static void free_stack_comp_unit (void *);
1996 static hashval_t partial_die_hash (const void *item);
1998 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
2000 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
2001 (sect_offset sect_off, unsigned int offset_in_dwz, struct objfile *objfile);
2003 static void init_one_comp_unit (struct dwarf2_cu *cu,
2004 struct dwarf2_per_cu_data *per_cu);
2006 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
2007 struct die_info *comp_unit_die,
2008 enum language pretend_language);
2010 static void free_heap_comp_unit (void *);
2012 static void free_cached_comp_units (void *);
2014 static void age_cached_comp_units (void);
2016 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
2018 static struct type *set_die_type (struct die_info *, struct type *,
2019 struct dwarf2_cu *);
2021 static void create_all_comp_units (struct objfile *);
2023 static int create_all_type_units (struct objfile *);
2025 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
2028 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
2031 static void process_full_type_unit (struct dwarf2_per_cu_data *,
2034 static void dwarf2_add_dependence (struct dwarf2_cu *,
2035 struct dwarf2_per_cu_data *);
2037 static void dwarf2_mark (struct dwarf2_cu *);
2039 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
2041 static struct type *get_die_type_at_offset (sect_offset,
2042 struct dwarf2_per_cu_data *);
2044 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
2046 static void dwarf2_release_queue (void *dummy);
2048 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
2049 enum language pretend_language);
2051 static void process_queue (void);
2053 /* The return type of find_file_and_directory. Note, the enclosed
2054 string pointers are only valid while this object is valid. */
2056 struct file_and_directory
2058 /* The filename. This is never NULL. */
2061 /* The compilation directory. NULL if not known. If we needed to
2062 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
2063 points directly to the DW_AT_comp_dir string attribute owned by
2064 the obstack that owns the DIE. */
2065 const char *comp_dir;
2067 /* If we needed to build a new string for comp_dir, this is what
2068 owns the storage. */
2069 std::string comp_dir_storage;
2072 static file_and_directory find_file_and_directory (struct die_info *die,
2073 struct dwarf2_cu *cu);
2075 static char *file_full_name (int file, struct line_header *lh,
2076 const char *comp_dir);
2078 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
2079 enum class rcuh_kind { COMPILE, TYPE };
2081 static const gdb_byte *read_and_check_comp_unit_head
2082 (struct comp_unit_head *header,
2083 struct dwarf2_section_info *section,
2084 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
2085 rcuh_kind section_kind);
2087 static void init_cutu_and_read_dies
2088 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
2089 int use_existing_cu, int keep,
2090 die_reader_func_ftype *die_reader_func, void *data);
2092 static void init_cutu_and_read_dies_simple
2093 (struct dwarf2_per_cu_data *this_cu,
2094 die_reader_func_ftype *die_reader_func, void *data);
2096 static htab_t allocate_signatured_type_table (struct objfile *objfile);
2098 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
2100 static struct dwo_unit *lookup_dwo_unit_in_dwp
2101 (struct dwp_file *dwp_file, const char *comp_dir,
2102 ULONGEST signature, int is_debug_types);
2104 static struct dwp_file *get_dwp_file (void);
2106 static struct dwo_unit *lookup_dwo_comp_unit
2107 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
2109 static struct dwo_unit *lookup_dwo_type_unit
2110 (struct signatured_type *, const char *, const char *);
2112 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
2114 static void free_dwo_file_cleanup (void *);
2116 static void process_cu_includes (void);
2118 static void check_producer (struct dwarf2_cu *cu);
2120 static void free_line_header_voidp (void *arg);
2122 /* Various complaints about symbol reading that don't abort the process. */
2125 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2127 complaint (&symfile_complaints,
2128 _("statement list doesn't fit in .debug_line section"));
2132 dwarf2_debug_line_missing_file_complaint (void)
2134 complaint (&symfile_complaints,
2135 _(".debug_line section has line data without a file"));
2139 dwarf2_debug_line_missing_end_sequence_complaint (void)
2141 complaint (&symfile_complaints,
2142 _(".debug_line section has line "
2143 "program sequence without an end"));
2147 dwarf2_complex_location_expr_complaint (void)
2149 complaint (&symfile_complaints, _("location expression too complex"));
2153 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2156 complaint (&symfile_complaints,
2157 _("const value length mismatch for '%s', got %d, expected %d"),
2162 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2164 complaint (&symfile_complaints,
2165 _("debug info runs off end of %s section"
2167 get_section_name (section),
2168 get_section_file_name (section));
2172 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2174 complaint (&symfile_complaints,
2175 _("macro debug info contains a "
2176 "malformed macro definition:\n`%s'"),
2181 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2183 complaint (&symfile_complaints,
2184 _("invalid attribute class or form for '%s' in '%s'"),
2188 /* Hash function for line_header_hash. */
2191 line_header_hash (const struct line_header *ofs)
2193 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2196 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2199 line_header_hash_voidp (const void *item)
2201 const struct line_header *ofs = (const struct line_header *) item;
2203 return line_header_hash (ofs);
2206 /* Equality function for line_header_hash. */
2209 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2211 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2212 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2214 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2215 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2220 /* Read the given attribute value as an address, taking the attribute's
2221 form into account. */
2224 attr_value_as_address (struct attribute *attr)
2228 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2230 /* Aside from a few clearly defined exceptions, attributes that
2231 contain an address must always be in DW_FORM_addr form.
2232 Unfortunately, some compilers happen to be violating this
2233 requirement by encoding addresses using other forms, such
2234 as DW_FORM_data4 for example. For those broken compilers,
2235 we try to do our best, without any guarantee of success,
2236 to interpret the address correctly. It would also be nice
2237 to generate a complaint, but that would require us to maintain
2238 a list of legitimate cases where a non-address form is allowed,
2239 as well as update callers to pass in at least the CU's DWARF
2240 version. This is more overhead than what we're willing to
2241 expand for a pretty rare case. */
2242 addr = DW_UNSND (attr);
2245 addr = DW_ADDR (attr);
2250 /* The suffix for an index file. */
2251 #define INDEX_SUFFIX ".gdb-index"
2253 /* See declaration. */
2255 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2256 const dwarf2_debug_sections *names)
2257 : objfile (objfile_)
2260 names = &dwarf2_elf_names;
2262 bfd *obfd = objfile->obfd;
2264 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2265 locate_sections (obfd, sec, *names);
2268 dwarf2_per_objfile::~dwarf2_per_objfile ()
2270 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2271 free_cached_comp_units ();
2273 if (quick_file_names_table)
2274 htab_delete (quick_file_names_table);
2276 if (line_header_hash)
2277 htab_delete (line_header_hash);
2279 /* Everything else should be on the objfile obstack. */
2282 /* See declaration. */
2285 dwarf2_per_objfile::free_cached_comp_units ()
2287 dwarf2_per_cu_data *per_cu = read_in_chain;
2288 dwarf2_per_cu_data **last_chain = &read_in_chain;
2289 while (per_cu != NULL)
2291 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2293 free_heap_comp_unit (per_cu->cu);
2294 *last_chain = next_cu;
2299 /* Try to locate the sections we need for DWARF 2 debugging
2300 information and return true if we have enough to do something.
2301 NAMES points to the dwarf2 section names, or is NULL if the standard
2302 ELF names are used. */
2305 dwarf2_has_info (struct objfile *objfile,
2306 const struct dwarf2_debug_sections *names)
2308 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
2309 objfile_data (objfile, dwarf2_objfile_data_key));
2310 if (!dwarf2_per_objfile)
2312 /* Initialize per-objfile state. */
2313 struct dwarf2_per_objfile *data
2314 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_objfile);
2316 dwarf2_per_objfile = new (data) struct dwarf2_per_objfile (objfile, names);
2317 set_objfile_data (objfile, dwarf2_objfile_data_key, dwarf2_per_objfile);
2319 return (!dwarf2_per_objfile->info.is_virtual
2320 && dwarf2_per_objfile->info.s.section != NULL
2321 && !dwarf2_per_objfile->abbrev.is_virtual
2322 && dwarf2_per_objfile->abbrev.s.section != NULL);
2325 /* Return the containing section of virtual section SECTION. */
2327 static struct dwarf2_section_info *
2328 get_containing_section (const struct dwarf2_section_info *section)
2330 gdb_assert (section->is_virtual);
2331 return section->s.containing_section;
2334 /* Return the bfd owner of SECTION. */
2337 get_section_bfd_owner (const struct dwarf2_section_info *section)
2339 if (section->is_virtual)
2341 section = get_containing_section (section);
2342 gdb_assert (!section->is_virtual);
2344 return section->s.section->owner;
2347 /* Return the bfd section of SECTION.
2348 Returns NULL if the section is not present. */
2351 get_section_bfd_section (const struct dwarf2_section_info *section)
2353 if (section->is_virtual)
2355 section = get_containing_section (section);
2356 gdb_assert (!section->is_virtual);
2358 return section->s.section;
2361 /* Return the name of SECTION. */
2364 get_section_name (const struct dwarf2_section_info *section)
2366 asection *sectp = get_section_bfd_section (section);
2368 gdb_assert (sectp != NULL);
2369 return bfd_section_name (get_section_bfd_owner (section), sectp);
2372 /* Return the name of the file SECTION is in. */
2375 get_section_file_name (const struct dwarf2_section_info *section)
2377 bfd *abfd = get_section_bfd_owner (section);
2379 return bfd_get_filename (abfd);
2382 /* Return the id of SECTION.
2383 Returns 0 if SECTION doesn't exist. */
2386 get_section_id (const struct dwarf2_section_info *section)
2388 asection *sectp = get_section_bfd_section (section);
2395 /* Return the flags of SECTION.
2396 SECTION (or containing section if this is a virtual section) must exist. */
2399 get_section_flags (const struct dwarf2_section_info *section)
2401 asection *sectp = get_section_bfd_section (section);
2403 gdb_assert (sectp != NULL);
2404 return bfd_get_section_flags (sectp->owner, sectp);
2407 /* When loading sections, we look either for uncompressed section or for
2408 compressed section names. */
2411 section_is_p (const char *section_name,
2412 const struct dwarf2_section_names *names)
2414 if (names->normal != NULL
2415 && strcmp (section_name, names->normal) == 0)
2417 if (names->compressed != NULL
2418 && strcmp (section_name, names->compressed) == 0)
2423 /* See declaration. */
2426 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2427 const dwarf2_debug_sections &names)
2429 flagword aflag = bfd_get_section_flags (abfd, sectp);
2431 if ((aflag & SEC_HAS_CONTENTS) == 0)
2434 else if (section_is_p (sectp->name, &names.info))
2436 this->info.s.section = sectp;
2437 this->info.size = bfd_get_section_size (sectp);
2439 else if (section_is_p (sectp->name, &names.abbrev))
2441 this->abbrev.s.section = sectp;
2442 this->abbrev.size = bfd_get_section_size (sectp);
2444 else if (section_is_p (sectp->name, &names.line))
2446 this->line.s.section = sectp;
2447 this->line.size = bfd_get_section_size (sectp);
2449 else if (section_is_p (sectp->name, &names.loc))
2451 this->loc.s.section = sectp;
2452 this->loc.size = bfd_get_section_size (sectp);
2454 else if (section_is_p (sectp->name, &names.loclists))
2456 this->loclists.s.section = sectp;
2457 this->loclists.size = bfd_get_section_size (sectp);
2459 else if (section_is_p (sectp->name, &names.macinfo))
2461 this->macinfo.s.section = sectp;
2462 this->macinfo.size = bfd_get_section_size (sectp);
2464 else if (section_is_p (sectp->name, &names.macro))
2466 this->macro.s.section = sectp;
2467 this->macro.size = bfd_get_section_size (sectp);
2469 else if (section_is_p (sectp->name, &names.str))
2471 this->str.s.section = sectp;
2472 this->str.size = bfd_get_section_size (sectp);
2474 else if (section_is_p (sectp->name, &names.line_str))
2476 this->line_str.s.section = sectp;
2477 this->line_str.size = bfd_get_section_size (sectp);
2479 else if (section_is_p (sectp->name, &names.addr))
2481 this->addr.s.section = sectp;
2482 this->addr.size = bfd_get_section_size (sectp);
2484 else if (section_is_p (sectp->name, &names.frame))
2486 this->frame.s.section = sectp;
2487 this->frame.size = bfd_get_section_size (sectp);
2489 else if (section_is_p (sectp->name, &names.eh_frame))
2491 this->eh_frame.s.section = sectp;
2492 this->eh_frame.size = bfd_get_section_size (sectp);
2494 else if (section_is_p (sectp->name, &names.ranges))
2496 this->ranges.s.section = sectp;
2497 this->ranges.size = bfd_get_section_size (sectp);
2499 else if (section_is_p (sectp->name, &names.rnglists))
2501 this->rnglists.s.section = sectp;
2502 this->rnglists.size = bfd_get_section_size (sectp);
2504 else if (section_is_p (sectp->name, &names.types))
2506 struct dwarf2_section_info type_section;
2508 memset (&type_section, 0, sizeof (type_section));
2509 type_section.s.section = sectp;
2510 type_section.size = bfd_get_section_size (sectp);
2512 VEC_safe_push (dwarf2_section_info_def, this->types,
2515 else if (section_is_p (sectp->name, &names.gdb_index))
2517 this->gdb_index.s.section = sectp;
2518 this->gdb_index.size = bfd_get_section_size (sectp);
2521 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2522 && bfd_section_vma (abfd, sectp) == 0)
2523 this->has_section_at_zero = true;
2526 /* A helper function that decides whether a section is empty,
2530 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2532 if (section->is_virtual)
2533 return section->size == 0;
2534 return section->s.section == NULL || section->size == 0;
2537 /* Read the contents of the section INFO.
2538 OBJFILE is the main object file, but not necessarily the file where
2539 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2541 If the section is compressed, uncompress it before returning. */
2544 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2548 gdb_byte *buf, *retbuf;
2552 info->buffer = NULL;
2555 if (dwarf2_section_empty_p (info))
2558 sectp = get_section_bfd_section (info);
2560 /* If this is a virtual section we need to read in the real one first. */
2561 if (info->is_virtual)
2563 struct dwarf2_section_info *containing_section =
2564 get_containing_section (info);
2566 gdb_assert (sectp != NULL);
2567 if ((sectp->flags & SEC_RELOC) != 0)
2569 error (_("Dwarf Error: DWP format V2 with relocations is not"
2570 " supported in section %s [in module %s]"),
2571 get_section_name (info), get_section_file_name (info));
2573 dwarf2_read_section (objfile, containing_section);
2574 /* Other code should have already caught virtual sections that don't
2576 gdb_assert (info->virtual_offset + info->size
2577 <= containing_section->size);
2578 /* If the real section is empty or there was a problem reading the
2579 section we shouldn't get here. */
2580 gdb_assert (containing_section->buffer != NULL);
2581 info->buffer = containing_section->buffer + info->virtual_offset;
2585 /* If the section has relocations, we must read it ourselves.
2586 Otherwise we attach it to the BFD. */
2587 if ((sectp->flags & SEC_RELOC) == 0)
2589 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2593 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2596 /* When debugging .o files, we may need to apply relocations; see
2597 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2598 We never compress sections in .o files, so we only need to
2599 try this when the section is not compressed. */
2600 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2603 info->buffer = retbuf;
2607 abfd = get_section_bfd_owner (info);
2608 gdb_assert (abfd != NULL);
2610 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2611 || bfd_bread (buf, info->size, abfd) != info->size)
2613 error (_("Dwarf Error: Can't read DWARF data"
2614 " in section %s [in module %s]"),
2615 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2619 /* A helper function that returns the size of a section in a safe way.
2620 If you are positive that the section has been read before using the
2621 size, then it is safe to refer to the dwarf2_section_info object's
2622 "size" field directly. In other cases, you must call this
2623 function, because for compressed sections the size field is not set
2624 correctly until the section has been read. */
2626 static bfd_size_type
2627 dwarf2_section_size (struct objfile *objfile,
2628 struct dwarf2_section_info *info)
2631 dwarf2_read_section (objfile, info);
2635 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2639 dwarf2_get_section_info (struct objfile *objfile,
2640 enum dwarf2_section_enum sect,
2641 asection **sectp, const gdb_byte **bufp,
2642 bfd_size_type *sizep)
2644 struct dwarf2_per_objfile *data
2645 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2646 dwarf2_objfile_data_key);
2647 struct dwarf2_section_info *info;
2649 /* We may see an objfile without any DWARF, in which case we just
2660 case DWARF2_DEBUG_FRAME:
2661 info = &data->frame;
2663 case DWARF2_EH_FRAME:
2664 info = &data->eh_frame;
2667 gdb_assert_not_reached ("unexpected section");
2670 dwarf2_read_section (objfile, info);
2672 *sectp = get_section_bfd_section (info);
2673 *bufp = info->buffer;
2674 *sizep = info->size;
2677 /* A helper function to find the sections for a .dwz file. */
2680 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2682 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2684 /* Note that we only support the standard ELF names, because .dwz
2685 is ELF-only (at the time of writing). */
2686 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2688 dwz_file->abbrev.s.section = sectp;
2689 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2691 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2693 dwz_file->info.s.section = sectp;
2694 dwz_file->info.size = bfd_get_section_size (sectp);
2696 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2698 dwz_file->str.s.section = sectp;
2699 dwz_file->str.size = bfd_get_section_size (sectp);
2701 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2703 dwz_file->line.s.section = sectp;
2704 dwz_file->line.size = bfd_get_section_size (sectp);
2706 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2708 dwz_file->macro.s.section = sectp;
2709 dwz_file->macro.size = bfd_get_section_size (sectp);
2711 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2713 dwz_file->gdb_index.s.section = sectp;
2714 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2718 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2719 there is no .gnu_debugaltlink section in the file. Error if there
2720 is such a section but the file cannot be found. */
2722 static struct dwz_file *
2723 dwarf2_get_dwz_file (void)
2725 const char *filename;
2726 struct dwz_file *result;
2727 bfd_size_type buildid_len_arg;
2731 if (dwarf2_per_objfile->dwz_file != NULL)
2732 return dwarf2_per_objfile->dwz_file;
2734 bfd_set_error (bfd_error_no_error);
2735 gdb::unique_xmalloc_ptr<char> data
2736 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2737 &buildid_len_arg, &buildid));
2740 if (bfd_get_error () == bfd_error_no_error)
2742 error (_("could not read '.gnu_debugaltlink' section: %s"),
2743 bfd_errmsg (bfd_get_error ()));
2746 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
2748 buildid_len = (size_t) buildid_len_arg;
2750 filename = data.get ();
2752 std::string abs_storage;
2753 if (!IS_ABSOLUTE_PATH (filename))
2755 gdb::unique_xmalloc_ptr<char> abs
2756 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2758 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2759 filename = abs_storage.c_str ();
2762 /* First try the file name given in the section. If that doesn't
2763 work, try to use the build-id instead. */
2764 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2765 if (dwz_bfd != NULL)
2767 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2771 if (dwz_bfd == NULL)
2772 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2774 if (dwz_bfd == NULL)
2775 error (_("could not find '.gnu_debugaltlink' file for %s"),
2776 objfile_name (dwarf2_per_objfile->objfile));
2778 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2780 result->dwz_bfd = dwz_bfd.release ();
2782 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
2784 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
2785 dwarf2_per_objfile->dwz_file = result;
2789 /* DWARF quick_symbols_functions support. */
2791 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2792 unique line tables, so we maintain a separate table of all .debug_line
2793 derived entries to support the sharing.
2794 All the quick functions need is the list of file names. We discard the
2795 line_header when we're done and don't need to record it here. */
2796 struct quick_file_names
2798 /* The data used to construct the hash key. */
2799 struct stmt_list_hash hash;
2801 /* The number of entries in file_names, real_names. */
2802 unsigned int num_file_names;
2804 /* The file names from the line table, after being run through
2806 const char **file_names;
2808 /* The file names from the line table after being run through
2809 gdb_realpath. These are computed lazily. */
2810 const char **real_names;
2813 /* When using the index (and thus not using psymtabs), each CU has an
2814 object of this type. This is used to hold information needed by
2815 the various "quick" methods. */
2816 struct dwarf2_per_cu_quick_data
2818 /* The file table. This can be NULL if there was no file table
2819 or it's currently not read in.
2820 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2821 struct quick_file_names *file_names;
2823 /* The corresponding symbol table. This is NULL if symbols for this
2824 CU have not yet been read. */
2825 struct compunit_symtab *compunit_symtab;
2827 /* A temporary mark bit used when iterating over all CUs in
2828 expand_symtabs_matching. */
2829 unsigned int mark : 1;
2831 /* True if we've tried to read the file table and found there isn't one.
2832 There will be no point in trying to read it again next time. */
2833 unsigned int no_file_data : 1;
2836 /* Utility hash function for a stmt_list_hash. */
2839 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2843 if (stmt_list_hash->dwo_unit != NULL)
2844 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2845 v += to_underlying (stmt_list_hash->line_sect_off);
2849 /* Utility equality function for a stmt_list_hash. */
2852 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2853 const struct stmt_list_hash *rhs)
2855 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2857 if (lhs->dwo_unit != NULL
2858 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2861 return lhs->line_sect_off == rhs->line_sect_off;
2864 /* Hash function for a quick_file_names. */
2867 hash_file_name_entry (const void *e)
2869 const struct quick_file_names *file_data
2870 = (const struct quick_file_names *) e;
2872 return hash_stmt_list_entry (&file_data->hash);
2875 /* Equality function for a quick_file_names. */
2878 eq_file_name_entry (const void *a, const void *b)
2880 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2881 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2883 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2886 /* Delete function for a quick_file_names. */
2889 delete_file_name_entry (void *e)
2891 struct quick_file_names *file_data = (struct quick_file_names *) e;
2894 for (i = 0; i < file_data->num_file_names; ++i)
2896 xfree ((void*) file_data->file_names[i]);
2897 if (file_data->real_names)
2898 xfree ((void*) file_data->real_names[i]);
2901 /* The space for the struct itself lives on objfile_obstack,
2902 so we don't free it here. */
2905 /* Create a quick_file_names hash table. */
2908 create_quick_file_names_table (unsigned int nr_initial_entries)
2910 return htab_create_alloc (nr_initial_entries,
2911 hash_file_name_entry, eq_file_name_entry,
2912 delete_file_name_entry, xcalloc, xfree);
2915 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2916 have to be created afterwards. You should call age_cached_comp_units after
2917 processing PER_CU->CU. dw2_setup must have been already called. */
2920 load_cu (struct dwarf2_per_cu_data *per_cu)
2922 if (per_cu->is_debug_types)
2923 load_full_type_unit (per_cu);
2925 load_full_comp_unit (per_cu, language_minimal);
2927 if (per_cu->cu == NULL)
2928 return; /* Dummy CU. */
2930 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2933 /* Read in the symbols for PER_CU. */
2936 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2938 struct cleanup *back_to;
2940 /* Skip type_unit_groups, reading the type units they contain
2941 is handled elsewhere. */
2942 if (IS_TYPE_UNIT_GROUP (per_cu))
2945 back_to = make_cleanup (dwarf2_release_queue, NULL);
2947 if (dwarf2_per_objfile->using_index
2948 ? per_cu->v.quick->compunit_symtab == NULL
2949 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2951 queue_comp_unit (per_cu, language_minimal);
2954 /* If we just loaded a CU from a DWO, and we're working with an index
2955 that may badly handle TUs, load all the TUs in that DWO as well.
2956 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2957 if (!per_cu->is_debug_types
2958 && per_cu->cu != NULL
2959 && per_cu->cu->dwo_unit != NULL
2960 && dwarf2_per_objfile->index_table != NULL
2961 && dwarf2_per_objfile->index_table->version <= 7
2962 /* DWP files aren't supported yet. */
2963 && get_dwp_file () == NULL)
2964 queue_and_load_all_dwo_tus (per_cu);
2969 /* Age the cache, releasing compilation units that have not
2970 been used recently. */
2971 age_cached_comp_units ();
2973 do_cleanups (back_to);
2976 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2977 the objfile from which this CU came. Returns the resulting symbol
2980 static struct compunit_symtab *
2981 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2983 gdb_assert (dwarf2_per_objfile->using_index);
2984 if (!per_cu->v.quick->compunit_symtab)
2986 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2987 scoped_restore decrementer = increment_reading_symtab ();
2988 dw2_do_instantiate_symtab (per_cu);
2989 process_cu_includes ();
2990 do_cleanups (back_to);
2993 return per_cu->v.quick->compunit_symtab;
2996 /* Return the CU/TU given its index.
2998 This is intended for loops like:
3000 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3001 + dwarf2_per_objfile->n_type_units); ++i)
3003 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3009 static struct dwarf2_per_cu_data *
3010 dw2_get_cutu (int index)
3012 if (index >= dwarf2_per_objfile->n_comp_units)
3014 index -= dwarf2_per_objfile->n_comp_units;
3015 gdb_assert (index < dwarf2_per_objfile->n_type_units);
3016 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
3019 return dwarf2_per_objfile->all_comp_units[index];
3022 /* Return the CU given its index.
3023 This differs from dw2_get_cutu in that it's for when you know INDEX
3026 static struct dwarf2_per_cu_data *
3027 dw2_get_cu (int index)
3029 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
3031 return dwarf2_per_objfile->all_comp_units[index];
3034 /* A helper for create_cus_from_index that handles a given list of
3038 create_cus_from_index_list (struct objfile *objfile,
3039 const gdb_byte *cu_list, offset_type n_elements,
3040 struct dwarf2_section_info *section,
3046 for (i = 0; i < n_elements; i += 2)
3048 gdb_static_assert (sizeof (ULONGEST) >= 8);
3050 sect_offset sect_off
3051 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
3052 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3055 dwarf2_per_cu_data *the_cu
3056 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3057 struct dwarf2_per_cu_data);
3058 the_cu->sect_off = sect_off;
3059 the_cu->length = length;
3060 the_cu->objfile = objfile;
3061 the_cu->section = section;
3062 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3063 struct dwarf2_per_cu_quick_data);
3064 the_cu->is_dwz = is_dwz;
3065 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
3069 /* Read the CU list from the mapped index, and use it to create all
3070 the CU objects for this objfile. */
3073 create_cus_from_index (struct objfile *objfile,
3074 const gdb_byte *cu_list, offset_type cu_list_elements,
3075 const gdb_byte *dwz_list, offset_type dwz_elements)
3077 struct dwz_file *dwz;
3079 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
3080 dwarf2_per_objfile->all_comp_units =
3081 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
3082 dwarf2_per_objfile->n_comp_units);
3084 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
3085 &dwarf2_per_objfile->info, 0, 0);
3087 if (dwz_elements == 0)
3090 dwz = dwarf2_get_dwz_file ();
3091 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
3092 cu_list_elements / 2);
3095 /* Create the signatured type hash table from the index. */
3098 create_signatured_type_table_from_index (struct objfile *objfile,
3099 struct dwarf2_section_info *section,
3100 const gdb_byte *bytes,
3101 offset_type elements)
3104 htab_t sig_types_hash;
3106 dwarf2_per_objfile->n_type_units
3107 = dwarf2_per_objfile->n_allocated_type_units
3109 dwarf2_per_objfile->all_type_units =
3110 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3112 sig_types_hash = allocate_signatured_type_table (objfile);
3114 for (i = 0; i < elements; i += 3)
3116 struct signatured_type *sig_type;
3119 cu_offset type_offset_in_tu;
3121 gdb_static_assert (sizeof (ULONGEST) >= 8);
3122 sect_offset sect_off
3123 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3125 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3127 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3130 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3131 struct signatured_type);
3132 sig_type->signature = signature;
3133 sig_type->type_offset_in_tu = type_offset_in_tu;
3134 sig_type->per_cu.is_debug_types = 1;
3135 sig_type->per_cu.section = section;
3136 sig_type->per_cu.sect_off = sect_off;
3137 sig_type->per_cu.objfile = objfile;
3138 sig_type->per_cu.v.quick
3139 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3140 struct dwarf2_per_cu_quick_data);
3142 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3145 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
3148 dwarf2_per_objfile->signatured_types = sig_types_hash;
3151 /* Read the address map data from the mapped index, and use it to
3152 populate the objfile's psymtabs_addrmap. */
3155 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
3157 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3158 const gdb_byte *iter, *end;
3159 struct addrmap *mutable_map;
3162 auto_obstack temp_obstack;
3164 mutable_map = addrmap_create_mutable (&temp_obstack);
3166 iter = index->address_table;
3167 end = iter + index->address_table_size;
3169 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3173 ULONGEST hi, lo, cu_index;
3174 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3176 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3178 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3183 complaint (&symfile_complaints,
3184 _(".gdb_index address table has invalid range (%s - %s)"),
3185 hex_string (lo), hex_string (hi));
3189 if (cu_index >= dwarf2_per_objfile->n_comp_units)
3191 complaint (&symfile_complaints,
3192 _(".gdb_index address table has invalid CU number %u"),
3193 (unsigned) cu_index);
3197 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3198 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3199 addrmap_set_empty (mutable_map, lo, hi - 1, dw2_get_cutu (cu_index));
3202 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3203 &objfile->objfile_obstack);
3206 /* The hash function for strings in the mapped index. This is the same as
3207 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
3208 implementation. This is necessary because the hash function is tied to the
3209 format of the mapped index file. The hash values do not have to match with
3212 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
3215 mapped_index_string_hash (int index_version, const void *p)
3217 const unsigned char *str = (const unsigned char *) p;
3221 while ((c = *str++) != 0)
3223 if (index_version >= 5)
3225 r = r * 67 + c - 113;
3231 /* Find a slot in the mapped index INDEX for the object named NAME.
3232 If NAME is found, set *VEC_OUT to point to the CU vector in the
3233 constant pool and return true. If NAME cannot be found, return
3237 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3238 offset_type **vec_out)
3241 offset_type slot, step;
3242 int (*cmp) (const char *, const char *);
3244 gdb::unique_xmalloc_ptr<char> without_params;
3245 if (current_language->la_language == language_cplus
3246 || current_language->la_language == language_fortran
3247 || current_language->la_language == language_d)
3249 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3252 if (strchr (name, '(') != NULL)
3254 without_params = cp_remove_params (name);
3256 if (without_params != NULL)
3257 name = without_params.get ();
3261 /* Index version 4 did not support case insensitive searches. But the
3262 indices for case insensitive languages are built in lowercase, therefore
3263 simulate our NAME being searched is also lowercased. */
3264 hash = mapped_index_string_hash ((index->version == 4
3265 && case_sensitivity == case_sensitive_off
3266 ? 5 : index->version),
3269 slot = hash & (index->symbol_table_slots - 1);
3270 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
3271 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3275 /* Convert a slot number to an offset into the table. */
3276 offset_type i = 2 * slot;
3278 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
3281 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
3282 if (!cmp (name, str))
3284 *vec_out = (offset_type *) (index->constant_pool
3285 + MAYBE_SWAP (index->symbol_table[i + 1]));
3289 slot = (slot + step) & (index->symbol_table_slots - 1);
3293 /* A helper function that reads the .gdb_index from SECTION and fills
3294 in MAP. FILENAME is the name of the file containing the section;
3295 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3296 ok to use deprecated sections.
3298 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3299 out parameters that are filled in with information about the CU and
3300 TU lists in the section.
3302 Returns 1 if all went well, 0 otherwise. */
3305 read_index_from_section (struct objfile *objfile,
3306 const char *filename,
3308 struct dwarf2_section_info *section,
3309 struct mapped_index *map,
3310 const gdb_byte **cu_list,
3311 offset_type *cu_list_elements,
3312 const gdb_byte **types_list,
3313 offset_type *types_list_elements)
3315 const gdb_byte *addr;
3316 offset_type version;
3317 offset_type *metadata;
3320 if (dwarf2_section_empty_p (section))
3323 /* Older elfutils strip versions could keep the section in the main
3324 executable while splitting it for the separate debug info file. */
3325 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3328 dwarf2_read_section (objfile, section);
3330 addr = section->buffer;
3331 /* Version check. */
3332 version = MAYBE_SWAP (*(offset_type *) addr);
3333 /* Versions earlier than 3 emitted every copy of a psymbol. This
3334 causes the index to behave very poorly for certain requests. Version 3
3335 contained incomplete addrmap. So, it seems better to just ignore such
3339 static int warning_printed = 0;
3340 if (!warning_printed)
3342 warning (_("Skipping obsolete .gdb_index section in %s."),
3344 warning_printed = 1;
3348 /* Index version 4 uses a different hash function than index version
3351 Versions earlier than 6 did not emit psymbols for inlined
3352 functions. Using these files will cause GDB not to be able to
3353 set breakpoints on inlined functions by name, so we ignore these
3354 indices unless the user has done
3355 "set use-deprecated-index-sections on". */
3356 if (version < 6 && !deprecated_ok)
3358 static int warning_printed = 0;
3359 if (!warning_printed)
3362 Skipping deprecated .gdb_index section in %s.\n\
3363 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3364 to use the section anyway."),
3366 warning_printed = 1;
3370 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3371 of the TU (for symbols coming from TUs),
3372 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3373 Plus gold-generated indices can have duplicate entries for global symbols,
3374 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3375 These are just performance bugs, and we can't distinguish gdb-generated
3376 indices from gold-generated ones, so issue no warning here. */
3378 /* Indexes with higher version than the one supported by GDB may be no
3379 longer backward compatible. */
3383 map->version = version;
3384 map->total_size = section->size;
3386 metadata = (offset_type *) (addr + sizeof (offset_type));
3389 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3390 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3394 *types_list = addr + MAYBE_SWAP (metadata[i]);
3395 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3396 - MAYBE_SWAP (metadata[i]))
3400 map->address_table = addr + MAYBE_SWAP (metadata[i]);
3401 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
3402 - MAYBE_SWAP (metadata[i]));
3405 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
3406 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
3407 - MAYBE_SWAP (metadata[i]))
3408 / (2 * sizeof (offset_type)));
3411 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3417 /* Read the index file. If everything went ok, initialize the "quick"
3418 elements of all the CUs and return 1. Otherwise, return 0. */
3421 dwarf2_read_index (struct objfile *objfile)
3423 struct mapped_index local_map, *map;
3424 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3425 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3426 struct dwz_file *dwz;
3428 if (!read_index_from_section (objfile, objfile_name (objfile),
3429 use_deprecated_index_sections,
3430 &dwarf2_per_objfile->gdb_index, &local_map,
3431 &cu_list, &cu_list_elements,
3432 &types_list, &types_list_elements))
3435 /* Don't use the index if it's empty. */
3436 if (local_map.symbol_table_slots == 0)
3439 /* If there is a .dwz file, read it so we can get its CU list as
3441 dwz = dwarf2_get_dwz_file ();
3444 struct mapped_index dwz_map;
3445 const gdb_byte *dwz_types_ignore;
3446 offset_type dwz_types_elements_ignore;
3448 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3450 &dwz->gdb_index, &dwz_map,
3451 &dwz_list, &dwz_list_elements,
3453 &dwz_types_elements_ignore))
3455 warning (_("could not read '.gdb_index' section from %s; skipping"),
3456 bfd_get_filename (dwz->dwz_bfd));
3461 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3464 if (types_list_elements)
3466 struct dwarf2_section_info *section;
3468 /* We can only handle a single .debug_types when we have an
3470 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3473 section = VEC_index (dwarf2_section_info_def,
3474 dwarf2_per_objfile->types, 0);
3476 create_signatured_type_table_from_index (objfile, section, types_list,
3477 types_list_elements);
3480 create_addrmap_from_index (objfile, &local_map);
3482 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
3483 map = new (map) mapped_index ();
3486 dwarf2_per_objfile->index_table = map;
3487 dwarf2_per_objfile->using_index = 1;
3488 dwarf2_per_objfile->quick_file_names_table =
3489 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3494 /* A helper for the "quick" functions which sets the global
3495 dwarf2_per_objfile according to OBJFILE. */
3498 dw2_setup (struct objfile *objfile)
3500 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
3501 objfile_data (objfile, dwarf2_objfile_data_key));
3502 gdb_assert (dwarf2_per_objfile);
3505 /* die_reader_func for dw2_get_file_names. */
3508 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3509 const gdb_byte *info_ptr,
3510 struct die_info *comp_unit_die,
3514 struct dwarf2_cu *cu = reader->cu;
3515 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3516 struct objfile *objfile = dwarf2_per_objfile->objfile;
3517 struct dwarf2_per_cu_data *lh_cu;
3518 struct attribute *attr;
3521 struct quick_file_names *qfn;
3523 gdb_assert (! this_cu->is_debug_types);
3525 /* Our callers never want to match partial units -- instead they
3526 will match the enclosing full CU. */
3527 if (comp_unit_die->tag == DW_TAG_partial_unit)
3529 this_cu->v.quick->no_file_data = 1;
3537 sect_offset line_offset {};
3539 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3542 struct quick_file_names find_entry;
3544 line_offset = (sect_offset) DW_UNSND (attr);
3546 /* We may have already read in this line header (TU line header sharing).
3547 If we have we're done. */
3548 find_entry.hash.dwo_unit = cu->dwo_unit;
3549 find_entry.hash.line_sect_off = line_offset;
3550 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3551 &find_entry, INSERT);
3554 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3558 lh = dwarf_decode_line_header (line_offset, cu);
3562 lh_cu->v.quick->no_file_data = 1;
3566 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3567 qfn->hash.dwo_unit = cu->dwo_unit;
3568 qfn->hash.line_sect_off = line_offset;
3569 gdb_assert (slot != NULL);
3572 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3574 qfn->num_file_names = lh->file_names.size ();
3576 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3577 for (i = 0; i < lh->file_names.size (); ++i)
3578 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3579 qfn->real_names = NULL;
3581 lh_cu->v.quick->file_names = qfn;
3584 /* A helper for the "quick" functions which attempts to read the line
3585 table for THIS_CU. */
3587 static struct quick_file_names *
3588 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3590 /* This should never be called for TUs. */
3591 gdb_assert (! this_cu->is_debug_types);
3592 /* Nor type unit groups. */
3593 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3595 if (this_cu->v.quick->file_names != NULL)
3596 return this_cu->v.quick->file_names;
3597 /* If we know there is no line data, no point in looking again. */
3598 if (this_cu->v.quick->no_file_data)
3601 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3603 if (this_cu->v.quick->no_file_data)
3605 return this_cu->v.quick->file_names;
3608 /* A helper for the "quick" functions which computes and caches the
3609 real path for a given file name from the line table. */
3612 dw2_get_real_path (struct objfile *objfile,
3613 struct quick_file_names *qfn, int index)
3615 if (qfn->real_names == NULL)
3616 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3617 qfn->num_file_names, const char *);
3619 if (qfn->real_names[index] == NULL)
3620 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
3622 return qfn->real_names[index];
3625 static struct symtab *
3626 dw2_find_last_source_symtab (struct objfile *objfile)
3628 struct compunit_symtab *cust;
3631 dw2_setup (objfile);
3632 index = dwarf2_per_objfile->n_comp_units - 1;
3633 cust = dw2_instantiate_symtab (dw2_get_cutu (index));
3636 return compunit_primary_filetab (cust);
3639 /* Traversal function for dw2_forget_cached_source_info. */
3642 dw2_free_cached_file_names (void **slot, void *info)
3644 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3646 if (file_data->real_names)
3650 for (i = 0; i < file_data->num_file_names; ++i)
3652 xfree ((void*) file_data->real_names[i]);
3653 file_data->real_names[i] = NULL;
3661 dw2_forget_cached_source_info (struct objfile *objfile)
3663 dw2_setup (objfile);
3665 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3666 dw2_free_cached_file_names, NULL);
3669 /* Helper function for dw2_map_symtabs_matching_filename that expands
3670 the symtabs and calls the iterator. */
3673 dw2_map_expand_apply (struct objfile *objfile,
3674 struct dwarf2_per_cu_data *per_cu,
3675 const char *name, const char *real_path,
3676 gdb::function_view<bool (symtab *)> callback)
3678 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3680 /* Don't visit already-expanded CUs. */
3681 if (per_cu->v.quick->compunit_symtab)
3684 /* This may expand more than one symtab, and we want to iterate over
3686 dw2_instantiate_symtab (per_cu);
3688 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3689 last_made, callback);
3692 /* Implementation of the map_symtabs_matching_filename method. */
3695 dw2_map_symtabs_matching_filename
3696 (struct objfile *objfile, const char *name, const char *real_path,
3697 gdb::function_view<bool (symtab *)> callback)
3700 const char *name_basename = lbasename (name);
3702 dw2_setup (objfile);
3704 /* The rule is CUs specify all the files, including those used by
3705 any TU, so there's no need to scan TUs here. */
3707 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3710 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3711 struct quick_file_names *file_data;
3713 /* We only need to look at symtabs not already expanded. */
3714 if (per_cu->v.quick->compunit_symtab)
3717 file_data = dw2_get_file_names (per_cu);
3718 if (file_data == NULL)
3721 for (j = 0; j < file_data->num_file_names; ++j)
3723 const char *this_name = file_data->file_names[j];
3724 const char *this_real_name;
3726 if (compare_filenames_for_search (this_name, name))
3728 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3734 /* Before we invoke realpath, which can get expensive when many
3735 files are involved, do a quick comparison of the basenames. */
3736 if (! basenames_may_differ
3737 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3740 this_real_name = dw2_get_real_path (objfile, file_data, j);
3741 if (compare_filenames_for_search (this_real_name, name))
3743 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3749 if (real_path != NULL)
3751 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3752 gdb_assert (IS_ABSOLUTE_PATH (name));
3753 if (this_real_name != NULL
3754 && FILENAME_CMP (real_path, this_real_name) == 0)
3756 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3768 /* Struct used to manage iterating over all CUs looking for a symbol. */
3770 struct dw2_symtab_iterator
3772 /* The internalized form of .gdb_index. */
3773 struct mapped_index *index;
3774 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3775 int want_specific_block;
3776 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3777 Unused if !WANT_SPECIFIC_BLOCK. */
3779 /* The kind of symbol we're looking for. */
3781 /* The list of CUs from the index entry of the symbol,
3782 or NULL if not found. */
3784 /* The next element in VEC to look at. */
3786 /* The number of elements in VEC, or zero if there is no match. */
3788 /* Have we seen a global version of the symbol?
3789 If so we can ignore all further global instances.
3790 This is to work around gold/15646, inefficient gold-generated
3795 /* Initialize the index symtab iterator ITER.
3796 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3797 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3800 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3801 struct mapped_index *index,
3802 int want_specific_block,
3807 iter->index = index;
3808 iter->want_specific_block = want_specific_block;
3809 iter->block_index = block_index;
3810 iter->domain = domain;
3812 iter->global_seen = 0;
3814 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3815 iter->length = MAYBE_SWAP (*iter->vec);
3823 /* Return the next matching CU or NULL if there are no more. */
3825 static struct dwarf2_per_cu_data *
3826 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3828 for ( ; iter->next < iter->length; ++iter->next)
3830 offset_type cu_index_and_attrs =
3831 MAYBE_SWAP (iter->vec[iter->next + 1]);
3832 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3833 struct dwarf2_per_cu_data *per_cu;
3834 int want_static = iter->block_index != GLOBAL_BLOCK;
3835 /* This value is only valid for index versions >= 7. */
3836 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3837 gdb_index_symbol_kind symbol_kind =
3838 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3839 /* Only check the symbol attributes if they're present.
3840 Indices prior to version 7 don't record them,
3841 and indices >= 7 may elide them for certain symbols
3842 (gold does this). */
3844 (iter->index->version >= 7
3845 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3847 /* Don't crash on bad data. */
3848 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3849 + dwarf2_per_objfile->n_type_units))
3851 complaint (&symfile_complaints,
3852 _(".gdb_index entry has bad CU index"
3854 objfile_name (dwarf2_per_objfile->objfile));
3858 per_cu = dw2_get_cutu (cu_index);
3860 /* Skip if already read in. */
3861 if (per_cu->v.quick->compunit_symtab)
3864 /* Check static vs global. */
3867 if (iter->want_specific_block
3868 && want_static != is_static)
3870 /* Work around gold/15646. */
3871 if (!is_static && iter->global_seen)
3874 iter->global_seen = 1;
3877 /* Only check the symbol's kind if it has one. */
3880 switch (iter->domain)
3883 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3884 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3885 /* Some types are also in VAR_DOMAIN. */
3886 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3890 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3894 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3909 static struct compunit_symtab *
3910 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3911 const char *name, domain_enum domain)
3913 struct compunit_symtab *stab_best = NULL;
3914 struct mapped_index *index;
3916 dw2_setup (objfile);
3918 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
3920 index = dwarf2_per_objfile->index_table;
3922 /* index is NULL if OBJF_READNOW. */
3925 struct dw2_symtab_iterator iter;
3926 struct dwarf2_per_cu_data *per_cu;
3928 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3930 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3932 struct symbol *sym, *with_opaque = NULL;
3933 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
3934 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
3935 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3937 sym = block_find_symbol (block, name, domain,
3938 block_find_non_opaque_type_preferred,
3941 /* Some caution must be observed with overloaded functions
3942 and methods, since the index will not contain any overload
3943 information (but NAME might contain it). */
3946 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
3948 if (with_opaque != NULL
3949 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
3952 /* Keep looking through other CUs. */
3960 dw2_print_stats (struct objfile *objfile)
3962 int i, total, count;
3964 dw2_setup (objfile);
3965 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3967 for (i = 0; i < total; ++i)
3969 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3971 if (!per_cu->v.quick->compunit_symtab)
3974 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3975 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3978 /* This dumps minimal information about the index.
3979 It is called via "mt print objfiles".
3980 One use is to verify .gdb_index has been loaded by the
3981 gdb.dwarf2/gdb-index.exp testcase. */
3984 dw2_dump (struct objfile *objfile)
3986 dw2_setup (objfile);
3987 gdb_assert (dwarf2_per_objfile->using_index);
3988 printf_filtered (".gdb_index:");
3989 if (dwarf2_per_objfile->index_table != NULL)
3991 printf_filtered (" version %d\n",
3992 dwarf2_per_objfile->index_table->version);
3995 printf_filtered (" faked for \"readnow\"\n");
3996 printf_filtered ("\n");
4000 dw2_relocate (struct objfile *objfile,
4001 const struct section_offsets *new_offsets,
4002 const struct section_offsets *delta)
4004 /* There's nothing to relocate here. */
4008 dw2_expand_symtabs_for_function (struct objfile *objfile,
4009 const char *func_name)
4011 struct mapped_index *index;
4013 dw2_setup (objfile);
4015 index = dwarf2_per_objfile->index_table;
4017 /* index is NULL if OBJF_READNOW. */
4020 struct dw2_symtab_iterator iter;
4021 struct dwarf2_per_cu_data *per_cu;
4023 /* Note: It doesn't matter what we pass for block_index here. */
4024 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4027 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4028 dw2_instantiate_symtab (per_cu);
4033 dw2_expand_all_symtabs (struct objfile *objfile)
4037 dw2_setup (objfile);
4039 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4040 + dwarf2_per_objfile->n_type_units); ++i)
4042 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4044 dw2_instantiate_symtab (per_cu);
4049 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4050 const char *fullname)
4054 dw2_setup (objfile);
4056 /* We don't need to consider type units here.
4057 This is only called for examining code, e.g. expand_line_sal.
4058 There can be an order of magnitude (or more) more type units
4059 than comp units, and we avoid them if we can. */
4061 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4064 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4065 struct quick_file_names *file_data;
4067 /* We only need to look at symtabs not already expanded. */
4068 if (per_cu->v.quick->compunit_symtab)
4071 file_data = dw2_get_file_names (per_cu);
4072 if (file_data == NULL)
4075 for (j = 0; j < file_data->num_file_names; ++j)
4077 const char *this_fullname = file_data->file_names[j];
4079 if (filename_cmp (this_fullname, fullname) == 0)
4081 dw2_instantiate_symtab (per_cu);
4089 dw2_map_matching_symbols (struct objfile *objfile,
4090 const char * name, domain_enum domain,
4092 int (*callback) (struct block *,
4093 struct symbol *, void *),
4094 void *data, symbol_name_match_type match,
4095 symbol_compare_ftype *ordered_compare)
4097 /* Currently unimplemented; used for Ada. The function can be called if the
4098 current language is Ada for a non-Ada objfile using GNU index. As Ada
4099 does not look for non-Ada symbols this function should just return. */
4102 /* Symbol name matcher for .gdb_index names.
4104 Symbol names in .gdb_index have a few particularities:
4106 - There's no indication of which is the language of each symbol.
4108 Since each language has its own symbol name matching algorithm,
4109 and we don't know which language is the right one, we must match
4110 each symbol against all languages. This would be a potential
4111 performance problem if it were not mitigated by the
4112 mapped_index::name_components lookup table, which significantly
4113 reduces the number of times we need to call into this matcher,
4114 making it a non-issue.
4116 - Symbol names in the index have no overload (parameter)
4117 information. I.e., in C++, "foo(int)" and "foo(long)" both
4118 appear as "foo" in the index, for example.
4120 This means that the lookup names passed to the symbol name
4121 matcher functions must have no parameter information either
4122 because (e.g.) symbol search name "foo" does not match
4123 lookup-name "foo(int)" [while swapping search name for lookup
4126 class gdb_index_symbol_name_matcher
4129 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4130 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4132 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4133 Returns true if any matcher matches. */
4134 bool matches (const char *symbol_name);
4137 /* A reference to the lookup name we're matching against. */
4138 const lookup_name_info &m_lookup_name;
4140 /* A vector holding all the different symbol name matchers, for all
4142 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4145 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4146 (const lookup_name_info &lookup_name)
4147 : m_lookup_name (lookup_name)
4149 /* Prepare the vector of comparison functions upfront, to avoid
4150 doing the same work for each symbol. Care is taken to avoid
4151 matching with the same matcher more than once if/when multiple
4152 languages use the same matcher function. */
4153 auto &matchers = m_symbol_name_matcher_funcs;
4154 matchers.reserve (nr_languages);
4156 matchers.push_back (default_symbol_name_matcher);
4158 for (int i = 0; i < nr_languages; i++)
4160 const language_defn *lang = language_def ((enum language) i);
4161 if (lang->la_get_symbol_name_matcher != NULL)
4163 symbol_name_matcher_ftype *name_matcher
4164 = lang->la_get_symbol_name_matcher (m_lookup_name);
4166 /* Don't insert the same comparison routine more than once.
4167 Note that we do this linear walk instead of a cheaper
4168 sorted insert, or use a std::set or something like that,
4169 because relative order of function addresses is not
4170 stable. This is not a problem in practice because the
4171 number of supported languages is low, and the cost here
4172 is tiny compared to the number of searches we'll do
4173 afterwards using this object. */
4174 if (std::find (matchers.begin (), matchers.end (), name_matcher)
4176 matchers.push_back (name_matcher);
4182 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4184 for (auto matches_name : m_symbol_name_matcher_funcs)
4185 if (matches_name (symbol_name, m_lookup_name, NULL))
4191 /* Helper for dw2_expand_symtabs_matching that works with a
4192 mapped_index instead of the containing objfile. This is split to a
4193 separate function in order to be able to unit test the
4194 name_components matching using a mock mapped_index. For each
4195 symbol name that matches, calls MATCH_CALLBACK, passing it the
4196 symbol's index in the mapped_index symbol table. */
4199 dw2_expand_symtabs_matching_symbol
4200 (mapped_index &index,
4201 const lookup_name_info &lookup_name_in,
4202 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4203 enum search_domain kind,
4204 gdb::function_view<void (offset_type)> match_callback)
4206 lookup_name_info lookup_name_without_params
4207 = lookup_name_in.make_ignore_params ();
4208 gdb_index_symbol_name_matcher lookup_name_matcher
4209 (lookup_name_without_params);
4211 auto *name_cmp = case_sensitivity == case_sensitive_on ? strcmp : strcasecmp;
4213 /* Build the symbol name component sorted vector, if we haven't yet.
4214 The code below only knows how to break apart components of C++
4215 symbol names (and other languages that use '::' as
4216 namespace/module separator). If we add support for wild matching
4217 to some language that uses some other operator (E.g., Ada, Go and
4218 D use '.'), then we'll need to try splitting the symbol name
4219 according to that language too. Note that Ada does support wild
4220 matching, but doesn't currently support .gdb_index. */
4221 if (index.name_components.empty ())
4223 for (size_t iter = 0; iter < index.symbol_table_slots; ++iter)
4225 offset_type idx = 2 * iter;
4227 if (index.symbol_table[idx] == 0
4228 && index.symbol_table[idx + 1] == 0)
4231 const char *name = index.symbol_name_at (idx);
4233 /* Add each name component to the name component table. */
4234 unsigned int previous_len = 0;
4235 for (unsigned int current_len = cp_find_first_component (name);
4236 name[current_len] != '\0';
4237 current_len += cp_find_first_component (name + current_len))
4239 gdb_assert (name[current_len] == ':');
4240 index.name_components.push_back ({previous_len, idx});
4241 /* Skip the '::'. */
4243 previous_len = current_len;
4245 index.name_components.push_back ({previous_len, idx});
4248 /* Sort name_components elements by name. */
4249 auto name_comp_compare = [&] (const name_component &left,
4250 const name_component &right)
4252 const char *left_qualified = index.symbol_name_at (left.idx);
4253 const char *right_qualified = index.symbol_name_at (right.idx);
4255 const char *left_name = left_qualified + left.name_offset;
4256 const char *right_name = right_qualified + right.name_offset;
4258 return name_cmp (left_name, right_name) < 0;
4261 std::sort (index.name_components.begin (),
4262 index.name_components.end (),
4267 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4269 /* Comparison function object for lower_bound that matches against a
4270 given symbol name. */
4271 auto lookup_compare_lower = [&] (const name_component &elem,
4274 const char *elem_qualified = index.symbol_name_at (elem.idx);
4275 const char *elem_name = elem_qualified + elem.name_offset;
4276 return name_cmp (elem_name, name) < 0;
4279 /* Comparison function object for upper_bound that matches against a
4280 given symbol name. */
4281 auto lookup_compare_upper = [&] (const char *name,
4282 const name_component &elem)
4284 const char *elem_qualified = index.symbol_name_at (elem.idx);
4285 const char *elem_name = elem_qualified + elem.name_offset;
4286 return name_cmp (name, elem_name) < 0;
4289 auto begin = index.name_components.begin ();
4290 auto end = index.name_components.end ();
4292 /* Find the lower bound. */
4295 if (lookup_name_in.completion_mode () && cplus[0] == '\0')
4298 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4301 /* Find the upper bound. */
4304 if (lookup_name_in.completion_mode ())
4306 /* The string frobbing below won't work if the string is
4307 empty. We don't need it then, anyway -- if we're
4308 completing an empty string, then we want to iterate over
4310 if (cplus[0] == '\0')
4313 /* In completion mode, increment the last character because
4314 we want UPPER to point past all symbols names that have
4316 std::string after = cplus;
4318 gdb_assert (after.back () != 0xff);
4321 return std::upper_bound (lower, end, after.c_str (),
4322 lookup_compare_upper);
4325 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4328 /* Now for each symbol name in range, check to see if we have a name
4329 match, and if so, call the MATCH_CALLBACK callback. */
4331 /* The same symbol may appear more than once in the range though.
4332 E.g., if we're looking for symbols that complete "w", and we have
4333 a symbol named "w1::w2", we'll find the two name components for
4334 that same symbol in the range. To be sure we only call the
4335 callback once per symbol, we first collect the symbol name
4336 indexes that matched in a temporary vector and ignore
4338 std::vector<offset_type> matches;
4339 matches.reserve (std::distance (lower, upper));
4341 for (;lower != upper; ++lower)
4343 const char *qualified = index.symbol_name_at (lower->idx);
4345 if (!lookup_name_matcher.matches (qualified)
4346 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4349 matches.push_back (lower->idx);
4352 std::sort (matches.begin (), matches.end ());
4354 /* Finally call the callback, once per match. */
4356 for (offset_type idx : matches)
4360 match_callback (idx);
4365 /* Above we use a type wider than idx's for 'prev', since 0 and
4366 (offset_type)-1 are both possible values. */
4367 static_assert (sizeof (prev) > sizeof (offset_type), "");
4372 namespace selftests { namespace dw2_expand_symtabs_matching {
4374 /* A wrapper around mapped_index that builds a mock mapped_index, from
4375 the symbol list passed as parameter to the constructor. */
4376 class mock_mapped_index
4380 mock_mapped_index (const char *(&symbols)[N])
4381 : mock_mapped_index (symbols, N)
4384 /* Access the built index. */
4385 mapped_index &index ()
4389 mock_mapped_index(const mock_mapped_index &) = delete;
4390 void operator= (const mock_mapped_index &) = delete;
4393 mock_mapped_index (const char **symbols, size_t symbols_size)
4395 /* No string can live at offset zero. Add a dummy entry. */
4396 obstack_grow_str0 (&m_constant_pool, "");
4398 for (size_t i = 0; i < symbols_size; i++)
4400 const char *sym = symbols[i];
4401 size_t offset = obstack_object_size (&m_constant_pool);
4402 obstack_grow_str0 (&m_constant_pool, sym);
4403 m_symbol_table.push_back (offset);
4404 m_symbol_table.push_back (0);
4407 m_index.constant_pool = (const char *) obstack_base (&m_constant_pool);
4408 m_index.symbol_table = m_symbol_table.data ();
4409 m_index.symbol_table_slots = m_symbol_table.size () / 2;
4413 /* The built mapped_index. */
4414 mapped_index m_index{};
4416 /* The storage that the built mapped_index uses for symbol and
4417 constant pool tables. */
4418 std::vector<offset_type> m_symbol_table;
4419 auto_obstack m_constant_pool;
4422 /* Convenience function that converts a NULL pointer to a "<null>"
4423 string, to pass to print routines. */
4426 string_or_null (const char *str)
4428 return str != NULL ? str : "<null>";
4431 /* Check if a lookup_name_info built from
4432 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
4433 index. EXPECTED_LIST is the list of expected matches, in expected
4434 matching order. If no match expected, then an empty list is
4435 specified. Returns true on success. On failure prints a warning
4436 indicating the file:line that failed, and returns false. */
4439 check_match (const char *file, int line,
4440 mock_mapped_index &mock_index,
4441 const char *name, symbol_name_match_type match_type,
4442 bool completion_mode,
4443 std::initializer_list<const char *> expected_list)
4445 lookup_name_info lookup_name (name, match_type, completion_mode);
4447 bool matched = true;
4449 auto mismatch = [&] (const char *expected_str,
4452 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
4453 "expected=\"%s\", got=\"%s\"\n"),
4455 (match_type == symbol_name_match_type::FULL
4457 name, string_or_null (expected_str), string_or_null (got));
4461 auto expected_it = expected_list.begin ();
4462 auto expected_end = expected_list.end ();
4464 dw2_expand_symtabs_matching_symbol (mock_index.index (), lookup_name,
4466 [&] (offset_type idx)
4468 const char *matched_name = mock_index.index ().symbol_name_at (idx);
4469 const char *expected_str
4470 = expected_it == expected_end ? NULL : *expected_it++;
4472 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
4473 mismatch (expected_str, matched_name);
4476 const char *expected_str
4477 = expected_it == expected_end ? NULL : *expected_it++;
4478 if (expected_str != NULL)
4479 mismatch (expected_str, NULL);
4484 /* The symbols added to the mock mapped_index for testing (in
4486 static const char *test_symbols[] = {
4496 /* A name with all sorts of complications. Starts with "z" to make
4497 it easier for the completion tests below. */
4498 #define Z_SYM_NAME \
4499 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
4500 "::tuple<(anonymous namespace)::ui*, " \
4501 "std::default_delete<(anonymous namespace)::ui>, void>"
4509 mock_mapped_index mock_index (test_symbols);
4511 /* We let all tests run until the end even if some fails, for debug
4513 bool any_mismatch = false;
4515 /* Create the expected symbols list (an initializer_list). Needed
4516 because lists have commas, and we need to pass them to CHECK,
4517 which is a macro. */
4518 #define EXPECT(...) { __VA_ARGS__ }
4520 /* Wrapper for check_match that passes down the current
4521 __FILE__/__LINE__. */
4522 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
4523 any_mismatch |= !check_match (__FILE__, __LINE__, \
4525 NAME, MATCH_TYPE, COMPLETION_MODE, \
4528 /* Identity checks. */
4529 for (const char *sym : test_symbols)
4531 /* Should be able to match all existing symbols. */
4532 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
4535 /* Should be able to match all existing symbols with
4537 std::string with_params = std::string (sym) + "(int)";
4538 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4541 /* Should be able to match all existing symbols with
4542 parameters and qualifiers. */
4543 with_params = std::string (sym) + " ( int ) const";
4544 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4547 /* This should really find sym, but cp-name-parser.y doesn't
4548 know about lvalue/rvalue qualifiers yet. */
4549 with_params = std::string (sym) + " ( int ) &&";
4550 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4554 /* Check that completion mode works at each prefix of the expected
4557 static const char str[] = "function(int)";
4558 size_t len = strlen (str);
4561 for (size_t i = 1; i < len; i++)
4563 lookup.assign (str, i);
4564 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4565 EXPECT ("function"));
4569 /* While "w" is a prefix of both components, the match function
4570 should still only be called once. */
4572 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
4576 /* Same, with a "complicated" symbol. */
4578 static const char str[] = Z_SYM_NAME;
4579 size_t len = strlen (str);
4582 for (size_t i = 1; i < len; i++)
4584 lookup.assign (str, i);
4585 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4586 EXPECT (Z_SYM_NAME));
4590 /* In FULL mode, an incomplete symbol doesn't match. */
4592 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
4596 /* A complete symbol with parameters matches any overload, since the
4597 index has no overload info. */
4599 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
4600 EXPECT ("std::zfunction", "std::zfunction2"));
4603 /* Check that whitespace is ignored appropriately. A symbol with a
4604 template argument list. */
4606 static const char expected[] = "ns::foo<int>";
4607 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
4611 /* Check that whitespace is ignored appropriately. A symbol with a
4612 template argument list that includes a pointer. */
4614 static const char expected[] = "ns::foo<char*>";
4615 /* Try both completion and non-completion modes. */
4616 static const bool completion_mode[2] = {false, true};
4617 for (size_t i = 0; i < 2; i++)
4619 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
4620 completion_mode[i], EXPECT (expected));
4622 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
4623 completion_mode[i], EXPECT (expected));
4628 /* Check method qualifiers are ignored. */
4629 static const char expected[] = "ns::foo<char*>";
4630 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
4631 symbol_name_match_type::FULL, true, EXPECT (expected));
4632 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
4633 symbol_name_match_type::FULL, true, EXPECT (expected));
4636 /* Test lookup names that don't match anything. */
4638 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
4642 SELF_CHECK (!any_mismatch);
4648 }} // namespace selftests::dw2_expand_symtabs_matching
4650 #endif /* GDB_SELF_TEST */
4652 /* Helper for dw2_expand_matching symtabs. Called on each symbol
4653 matched, to expand corresponding CUs that were marked. IDX is the
4654 index of the symbol name that matched. */
4657 dw2_expand_marked_cus
4658 (mapped_index &index, offset_type idx,
4659 struct objfile *objfile,
4660 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
4661 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
4665 offset_type *vec, vec_len, vec_idx;
4666 bool global_seen = false;
4668 vec = (offset_type *) (index.constant_pool
4669 + MAYBE_SWAP (index.symbol_table[idx + 1]));
4670 vec_len = MAYBE_SWAP (vec[0]);
4671 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
4673 struct dwarf2_per_cu_data *per_cu;
4674 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
4675 /* This value is only valid for index versions >= 7. */
4676 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
4677 gdb_index_symbol_kind symbol_kind =
4678 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
4679 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
4680 /* Only check the symbol attributes if they're present.
4681 Indices prior to version 7 don't record them,
4682 and indices >= 7 may elide them for certain symbols
4683 (gold does this). */
4686 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4688 /* Work around gold/15646. */
4691 if (!is_static && global_seen)
4697 /* Only check the symbol's kind if it has one. */
4702 case VARIABLES_DOMAIN:
4703 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
4706 case FUNCTIONS_DOMAIN:
4707 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
4711 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4719 /* Don't crash on bad data. */
4720 if (cu_index >= (dwarf2_per_objfile->n_comp_units
4721 + dwarf2_per_objfile->n_type_units))
4723 complaint (&symfile_complaints,
4724 _(".gdb_index entry has bad CU index"
4725 " [in module %s]"), objfile_name (objfile));
4729 per_cu = dw2_get_cutu (cu_index);
4730 if (file_matcher == NULL || per_cu->v.quick->mark)
4732 int symtab_was_null =
4733 (per_cu->v.quick->compunit_symtab == NULL);
4735 dw2_instantiate_symtab (per_cu);
4737 if (expansion_notify != NULL
4739 && per_cu->v.quick->compunit_symtab != NULL)
4740 expansion_notify (per_cu->v.quick->compunit_symtab);
4746 dw2_expand_symtabs_matching
4747 (struct objfile *objfile,
4748 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
4749 const lookup_name_info &lookup_name,
4750 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4751 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
4752 enum search_domain kind)
4757 dw2_setup (objfile);
4759 /* index_table is NULL if OBJF_READNOW. */
4760 if (!dwarf2_per_objfile->index_table)
4763 if (file_matcher != NULL)
4765 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
4767 NULL, xcalloc, xfree));
4768 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
4770 NULL, xcalloc, xfree));
4772 /* The rule is CUs specify all the files, including those used by
4773 any TU, so there's no need to scan TUs here. */
4775 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4778 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4779 struct quick_file_names *file_data;
4784 per_cu->v.quick->mark = 0;
4786 /* We only need to look at symtabs not already expanded. */
4787 if (per_cu->v.quick->compunit_symtab)
4790 file_data = dw2_get_file_names (per_cu);
4791 if (file_data == NULL)
4794 if (htab_find (visited_not_found.get (), file_data) != NULL)
4796 else if (htab_find (visited_found.get (), file_data) != NULL)
4798 per_cu->v.quick->mark = 1;
4802 for (j = 0; j < file_data->num_file_names; ++j)
4804 const char *this_real_name;
4806 if (file_matcher (file_data->file_names[j], false))
4808 per_cu->v.quick->mark = 1;
4812 /* Before we invoke realpath, which can get expensive when many
4813 files are involved, do a quick comparison of the basenames. */
4814 if (!basenames_may_differ
4815 && !file_matcher (lbasename (file_data->file_names[j]),
4819 this_real_name = dw2_get_real_path (objfile, file_data, j);
4820 if (file_matcher (this_real_name, false))
4822 per_cu->v.quick->mark = 1;
4827 slot = htab_find_slot (per_cu->v.quick->mark
4828 ? visited_found.get ()
4829 : visited_not_found.get (),
4835 mapped_index &index = *dwarf2_per_objfile->index_table;
4837 dw2_expand_symtabs_matching_symbol (index, lookup_name,
4839 kind, [&] (offset_type idx)
4841 dw2_expand_marked_cus (index, idx, objfile, file_matcher,
4842 expansion_notify, kind);
4846 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
4849 static struct compunit_symtab *
4850 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
4855 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
4856 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
4859 if (cust->includes == NULL)
4862 for (i = 0; cust->includes[i]; ++i)
4864 struct compunit_symtab *s = cust->includes[i];
4866 s = recursively_find_pc_sect_compunit_symtab (s, pc);
4874 static struct compunit_symtab *
4875 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
4876 struct bound_minimal_symbol msymbol,
4878 struct obj_section *section,
4881 struct dwarf2_per_cu_data *data;
4882 struct compunit_symtab *result;
4884 dw2_setup (objfile);
4886 if (!objfile->psymtabs_addrmap)
4889 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
4894 if (warn_if_readin && data->v.quick->compunit_symtab)
4895 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
4896 paddress (get_objfile_arch (objfile), pc));
4899 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
4901 gdb_assert (result != NULL);
4906 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
4907 void *data, int need_fullname)
4909 dw2_setup (objfile);
4911 if (!dwarf2_per_objfile->filenames_cache)
4913 dwarf2_per_objfile->filenames_cache.emplace ();
4915 htab_up visited (htab_create_alloc (10,
4916 htab_hash_pointer, htab_eq_pointer,
4917 NULL, xcalloc, xfree));
4919 /* The rule is CUs specify all the files, including those used
4920 by any TU, so there's no need to scan TUs here. We can
4921 ignore file names coming from already-expanded CUs. */
4923 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4925 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4927 if (per_cu->v.quick->compunit_symtab)
4929 void **slot = htab_find_slot (visited.get (),
4930 per_cu->v.quick->file_names,
4933 *slot = per_cu->v.quick->file_names;
4937 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4940 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4941 struct quick_file_names *file_data;
4944 /* We only need to look at symtabs not already expanded. */
4945 if (per_cu->v.quick->compunit_symtab)
4948 file_data = dw2_get_file_names (per_cu);
4949 if (file_data == NULL)
4952 slot = htab_find_slot (visited.get (), file_data, INSERT);
4955 /* Already visited. */
4960 for (int j = 0; j < file_data->num_file_names; ++j)
4962 const char *filename = file_data->file_names[j];
4963 dwarf2_per_objfile->filenames_cache->seen (filename);
4968 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
4970 gdb::unique_xmalloc_ptr<char> this_real_name;
4973 this_real_name = gdb_realpath (filename);
4974 (*fun) (filename, this_real_name.get (), data);
4979 dw2_has_symbols (struct objfile *objfile)
4984 const struct quick_symbol_functions dwarf2_gdb_index_functions =
4987 dw2_find_last_source_symtab,
4988 dw2_forget_cached_source_info,
4989 dw2_map_symtabs_matching_filename,
4994 dw2_expand_symtabs_for_function,
4995 dw2_expand_all_symtabs,
4996 dw2_expand_symtabs_with_fullname,
4997 dw2_map_matching_symbols,
4998 dw2_expand_symtabs_matching,
4999 dw2_find_pc_sect_compunit_symtab,
5001 dw2_map_symbol_filenames
5004 /* Initialize for reading DWARF for this objfile. Return 0 if this
5005 file will use psymtabs, or 1 if using the GNU index. */
5008 dwarf2_initialize_objfile (struct objfile *objfile)
5010 /* If we're about to read full symbols, don't bother with the
5011 indices. In this case we also don't care if some other debug
5012 format is making psymtabs, because they are all about to be
5014 if ((objfile->flags & OBJF_READNOW))
5018 dwarf2_per_objfile->using_index = 1;
5019 create_all_comp_units (objfile);
5020 create_all_type_units (objfile);
5021 dwarf2_per_objfile->quick_file_names_table =
5022 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
5024 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
5025 + dwarf2_per_objfile->n_type_units); ++i)
5027 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
5029 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5030 struct dwarf2_per_cu_quick_data);
5033 /* Return 1 so that gdb sees the "quick" functions. However,
5034 these functions will be no-ops because we will have expanded
5039 if (dwarf2_read_index (objfile))
5047 /* Build a partial symbol table. */
5050 dwarf2_build_psymtabs (struct objfile *objfile)
5053 if (objfile->global_psymbols.capacity () == 0
5054 && objfile->static_psymbols.capacity () == 0)
5055 init_psymbol_list (objfile, 1024);
5059 /* This isn't really ideal: all the data we allocate on the
5060 objfile's obstack is still uselessly kept around. However,
5061 freeing it seems unsafe. */
5062 psymtab_discarder psymtabs (objfile);
5063 dwarf2_build_psymtabs_hard (objfile);
5066 CATCH (except, RETURN_MASK_ERROR)
5068 exception_print (gdb_stderr, except);
5073 /* Return the total length of the CU described by HEADER. */
5076 get_cu_length (const struct comp_unit_head *header)
5078 return header->initial_length_size + header->length;
5081 /* Return TRUE if SECT_OFF is within CU_HEADER. */
5084 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
5086 sect_offset bottom = cu_header->sect_off;
5087 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
5089 return sect_off >= bottom && sect_off < top;
5092 /* Find the base address of the compilation unit for range lists and
5093 location lists. It will normally be specified by DW_AT_low_pc.
5094 In DWARF-3 draft 4, the base address could be overridden by
5095 DW_AT_entry_pc. It's been removed, but GCC still uses this for
5096 compilation units with discontinuous ranges. */
5099 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
5101 struct attribute *attr;
5104 cu->base_address = 0;
5106 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
5109 cu->base_address = attr_value_as_address (attr);
5114 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
5117 cu->base_address = attr_value_as_address (attr);
5123 /* Read in the comp unit header information from the debug_info at info_ptr.
5124 Use rcuh_kind::COMPILE as the default type if not known by the caller.
5125 NOTE: This leaves members offset, first_die_offset to be filled in
5128 static const gdb_byte *
5129 read_comp_unit_head (struct comp_unit_head *cu_header,
5130 const gdb_byte *info_ptr,
5131 struct dwarf2_section_info *section,
5132 rcuh_kind section_kind)
5135 unsigned int bytes_read;
5136 const char *filename = get_section_file_name (section);
5137 bfd *abfd = get_section_bfd_owner (section);
5139 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
5140 cu_header->initial_length_size = bytes_read;
5141 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
5142 info_ptr += bytes_read;
5143 cu_header->version = read_2_bytes (abfd, info_ptr);
5145 if (cu_header->version < 5)
5146 switch (section_kind)
5148 case rcuh_kind::COMPILE:
5149 cu_header->unit_type = DW_UT_compile;
5151 case rcuh_kind::TYPE:
5152 cu_header->unit_type = DW_UT_type;
5155 internal_error (__FILE__, __LINE__,
5156 _("read_comp_unit_head: invalid section_kind"));
5160 cu_header->unit_type = static_cast<enum dwarf_unit_type>
5161 (read_1_byte (abfd, info_ptr));
5163 switch (cu_header->unit_type)
5166 if (section_kind != rcuh_kind::COMPILE)
5167 error (_("Dwarf Error: wrong unit_type in compilation unit header "
5168 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
5172 section_kind = rcuh_kind::TYPE;
5175 error (_("Dwarf Error: wrong unit_type in compilation unit header "
5176 "(is %d, should be %d or %d) [in module %s]"),
5177 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
5180 cu_header->addr_size = read_1_byte (abfd, info_ptr);
5183 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
5186 info_ptr += bytes_read;
5187 if (cu_header->version < 5)
5189 cu_header->addr_size = read_1_byte (abfd, info_ptr);
5192 signed_addr = bfd_get_sign_extend_vma (abfd);
5193 if (signed_addr < 0)
5194 internal_error (__FILE__, __LINE__,
5195 _("read_comp_unit_head: dwarf from non elf file"));
5196 cu_header->signed_addr_p = signed_addr;
5198 if (section_kind == rcuh_kind::TYPE)
5200 LONGEST type_offset;
5202 cu_header->signature = read_8_bytes (abfd, info_ptr);
5205 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
5206 info_ptr += bytes_read;
5207 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
5208 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
5209 error (_("Dwarf Error: Too big type_offset in compilation unit "
5210 "header (is %s) [in module %s]"), plongest (type_offset),
5217 /* Helper function that returns the proper abbrev section for
5220 static struct dwarf2_section_info *
5221 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
5223 struct dwarf2_section_info *abbrev;
5225 if (this_cu->is_dwz)
5226 abbrev = &dwarf2_get_dwz_file ()->abbrev;
5228 abbrev = &dwarf2_per_objfile->abbrev;
5233 /* Subroutine of read_and_check_comp_unit_head and
5234 read_and_check_type_unit_head to simplify them.
5235 Perform various error checking on the header. */
5238 error_check_comp_unit_head (struct comp_unit_head *header,
5239 struct dwarf2_section_info *section,
5240 struct dwarf2_section_info *abbrev_section)
5242 const char *filename = get_section_file_name (section);
5244 if (header->version < 2 || header->version > 5)
5245 error (_("Dwarf Error: wrong version in compilation unit header "
5246 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
5249 if (to_underlying (header->abbrev_sect_off)
5250 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
5251 error (_("Dwarf Error: bad offset (0x%x) in compilation unit header "
5252 "(offset 0x%x + 6) [in module %s]"),
5253 to_underlying (header->abbrev_sect_off),
5254 to_underlying (header->sect_off),
5257 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
5258 avoid potential 32-bit overflow. */
5259 if (((ULONGEST) header->sect_off + get_cu_length (header))
5261 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
5262 "(offset 0x%x + 0) [in module %s]"),
5263 header->length, to_underlying (header->sect_off),
5267 /* Read in a CU/TU header and perform some basic error checking.
5268 The contents of the header are stored in HEADER.
5269 The result is a pointer to the start of the first DIE. */
5271 static const gdb_byte *
5272 read_and_check_comp_unit_head (struct comp_unit_head *header,
5273 struct dwarf2_section_info *section,
5274 struct dwarf2_section_info *abbrev_section,
5275 const gdb_byte *info_ptr,
5276 rcuh_kind section_kind)
5278 const gdb_byte *beg_of_comp_unit = info_ptr;
5279 bfd *abfd = get_section_bfd_owner (section);
5281 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
5283 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
5285 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
5287 error_check_comp_unit_head (header, section, abbrev_section);
5292 /* Fetch the abbreviation table offset from a comp or type unit header. */
5295 read_abbrev_offset (struct dwarf2_section_info *section,
5296 sect_offset sect_off)
5298 bfd *abfd = get_section_bfd_owner (section);
5299 const gdb_byte *info_ptr;
5300 unsigned int initial_length_size, offset_size;
5303 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
5304 info_ptr = section->buffer + to_underlying (sect_off);
5305 read_initial_length (abfd, info_ptr, &initial_length_size);
5306 offset_size = initial_length_size == 4 ? 4 : 8;
5307 info_ptr += initial_length_size;
5309 version = read_2_bytes (abfd, info_ptr);
5313 /* Skip unit type and address size. */
5317 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
5320 /* Allocate a new partial symtab for file named NAME and mark this new
5321 partial symtab as being an include of PST. */
5324 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
5325 struct objfile *objfile)
5327 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
5329 if (!IS_ABSOLUTE_PATH (subpst->filename))
5331 /* It shares objfile->objfile_obstack. */
5332 subpst->dirname = pst->dirname;
5335 subpst->textlow = 0;
5336 subpst->texthigh = 0;
5338 subpst->dependencies
5339 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
5340 subpst->dependencies[0] = pst;
5341 subpst->number_of_dependencies = 1;
5343 subpst->globals_offset = 0;
5344 subpst->n_global_syms = 0;
5345 subpst->statics_offset = 0;
5346 subpst->n_static_syms = 0;
5347 subpst->compunit_symtab = NULL;
5348 subpst->read_symtab = pst->read_symtab;
5351 /* No private part is necessary for include psymtabs. This property
5352 can be used to differentiate between such include psymtabs and
5353 the regular ones. */
5354 subpst->read_symtab_private = NULL;
5357 /* Read the Line Number Program data and extract the list of files
5358 included by the source file represented by PST. Build an include
5359 partial symtab for each of these included files. */
5362 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
5363 struct die_info *die,
5364 struct partial_symtab *pst)
5367 struct attribute *attr;
5369 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
5371 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
5373 return; /* No linetable, so no includes. */
5375 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
5376 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
5380 hash_signatured_type (const void *item)
5382 const struct signatured_type *sig_type
5383 = (const struct signatured_type *) item;
5385 /* This drops the top 32 bits of the signature, but is ok for a hash. */
5386 return sig_type->signature;
5390 eq_signatured_type (const void *item_lhs, const void *item_rhs)
5392 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
5393 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
5395 return lhs->signature == rhs->signature;
5398 /* Allocate a hash table for signatured types. */
5401 allocate_signatured_type_table (struct objfile *objfile)
5403 return htab_create_alloc_ex (41,
5404 hash_signatured_type,
5407 &objfile->objfile_obstack,
5408 hashtab_obstack_allocate,
5409 dummy_obstack_deallocate);
5412 /* A helper function to add a signatured type CU to a table. */
5415 add_signatured_type_cu_to_table (void **slot, void *datum)
5417 struct signatured_type *sigt = (struct signatured_type *) *slot;
5418 struct signatured_type ***datap = (struct signatured_type ***) datum;
5426 /* A helper for create_debug_types_hash_table. Read types from SECTION
5427 and fill them into TYPES_HTAB. It will process only type units,
5428 therefore DW_UT_type. */
5431 create_debug_type_hash_table (struct dwo_file *dwo_file,
5432 dwarf2_section_info *section, htab_t &types_htab,
5433 rcuh_kind section_kind)
5435 struct objfile *objfile = dwarf2_per_objfile->objfile;
5436 struct dwarf2_section_info *abbrev_section;
5438 const gdb_byte *info_ptr, *end_ptr;
5440 abbrev_section = (dwo_file != NULL
5441 ? &dwo_file->sections.abbrev
5442 : &dwarf2_per_objfile->abbrev);
5444 if (dwarf_read_debug)
5445 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
5446 get_section_name (section),
5447 get_section_file_name (abbrev_section));
5449 dwarf2_read_section (objfile, section);
5450 info_ptr = section->buffer;
5452 if (info_ptr == NULL)
5455 /* We can't set abfd until now because the section may be empty or
5456 not present, in which case the bfd is unknown. */
5457 abfd = get_section_bfd_owner (section);
5459 /* We don't use init_cutu_and_read_dies_simple, or some such, here
5460 because we don't need to read any dies: the signature is in the
5463 end_ptr = info_ptr + section->size;
5464 while (info_ptr < end_ptr)
5466 struct signatured_type *sig_type;
5467 struct dwo_unit *dwo_tu;
5469 const gdb_byte *ptr = info_ptr;
5470 struct comp_unit_head header;
5471 unsigned int length;
5473 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
5475 /* Initialize it due to a false compiler warning. */
5476 header.signature = -1;
5477 header.type_cu_offset_in_tu = (cu_offset) -1;
5479 /* We need to read the type's signature in order to build the hash
5480 table, but we don't need anything else just yet. */
5482 ptr = read_and_check_comp_unit_head (&header, section,
5483 abbrev_section, ptr, section_kind);
5485 length = get_cu_length (&header);
5487 /* Skip dummy type units. */
5488 if (ptr >= info_ptr + length
5489 || peek_abbrev_code (abfd, ptr) == 0
5490 || header.unit_type != DW_UT_type)
5496 if (types_htab == NULL)
5499 types_htab = allocate_dwo_unit_table (objfile);
5501 types_htab = allocate_signatured_type_table (objfile);
5507 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5509 dwo_tu->dwo_file = dwo_file;
5510 dwo_tu->signature = header.signature;
5511 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
5512 dwo_tu->section = section;
5513 dwo_tu->sect_off = sect_off;
5514 dwo_tu->length = length;
5518 /* N.B.: type_offset is not usable if this type uses a DWO file.
5519 The real type_offset is in the DWO file. */
5521 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5522 struct signatured_type);
5523 sig_type->signature = header.signature;
5524 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
5525 sig_type->per_cu.objfile = objfile;
5526 sig_type->per_cu.is_debug_types = 1;
5527 sig_type->per_cu.section = section;
5528 sig_type->per_cu.sect_off = sect_off;
5529 sig_type->per_cu.length = length;
5532 slot = htab_find_slot (types_htab,
5533 dwo_file ? (void*) dwo_tu : (void *) sig_type,
5535 gdb_assert (slot != NULL);
5538 sect_offset dup_sect_off;
5542 const struct dwo_unit *dup_tu
5543 = (const struct dwo_unit *) *slot;
5545 dup_sect_off = dup_tu->sect_off;
5549 const struct signatured_type *dup_tu
5550 = (const struct signatured_type *) *slot;
5552 dup_sect_off = dup_tu->per_cu.sect_off;
5555 complaint (&symfile_complaints,
5556 _("debug type entry at offset 0x%x is duplicate to"
5557 " the entry at offset 0x%x, signature %s"),
5558 to_underlying (sect_off), to_underlying (dup_sect_off),
5559 hex_string (header.signature));
5561 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
5563 if (dwarf_read_debug > 1)
5564 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
5565 to_underlying (sect_off),
5566 hex_string (header.signature));
5572 /* Create the hash table of all entries in the .debug_types
5573 (or .debug_types.dwo) section(s).
5574 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
5575 otherwise it is NULL.
5577 The result is a pointer to the hash table or NULL if there are no types.
5579 Note: This function processes DWO files only, not DWP files. */
5582 create_debug_types_hash_table (struct dwo_file *dwo_file,
5583 VEC (dwarf2_section_info_def) *types,
5587 struct dwarf2_section_info *section;
5589 if (VEC_empty (dwarf2_section_info_def, types))
5593 VEC_iterate (dwarf2_section_info_def, types, ix, section);
5595 create_debug_type_hash_table (dwo_file, section, types_htab,
5599 /* Create the hash table of all entries in the .debug_types section,
5600 and initialize all_type_units.
5601 The result is zero if there is an error (e.g. missing .debug_types section),
5602 otherwise non-zero. */
5605 create_all_type_units (struct objfile *objfile)
5607 htab_t types_htab = NULL;
5608 struct signatured_type **iter;
5610 create_debug_type_hash_table (NULL, &dwarf2_per_objfile->info, types_htab,
5611 rcuh_kind::COMPILE);
5612 create_debug_types_hash_table (NULL, dwarf2_per_objfile->types, types_htab);
5613 if (types_htab == NULL)
5615 dwarf2_per_objfile->signatured_types = NULL;
5619 dwarf2_per_objfile->signatured_types = types_htab;
5621 dwarf2_per_objfile->n_type_units
5622 = dwarf2_per_objfile->n_allocated_type_units
5623 = htab_elements (types_htab);
5624 dwarf2_per_objfile->all_type_units =
5625 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
5626 iter = &dwarf2_per_objfile->all_type_units[0];
5627 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
5628 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
5629 == dwarf2_per_objfile->n_type_units);
5634 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
5635 If SLOT is non-NULL, it is the entry to use in the hash table.
5636 Otherwise we find one. */
5638 static struct signatured_type *
5639 add_type_unit (ULONGEST sig, void **slot)
5641 struct objfile *objfile = dwarf2_per_objfile->objfile;
5642 int n_type_units = dwarf2_per_objfile->n_type_units;
5643 struct signatured_type *sig_type;
5645 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
5647 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
5649 if (dwarf2_per_objfile->n_allocated_type_units == 0)
5650 dwarf2_per_objfile->n_allocated_type_units = 1;
5651 dwarf2_per_objfile->n_allocated_type_units *= 2;
5652 dwarf2_per_objfile->all_type_units
5653 = XRESIZEVEC (struct signatured_type *,
5654 dwarf2_per_objfile->all_type_units,
5655 dwarf2_per_objfile->n_allocated_type_units);
5656 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
5658 dwarf2_per_objfile->n_type_units = n_type_units;
5660 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5661 struct signatured_type);
5662 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
5663 sig_type->signature = sig;
5664 sig_type->per_cu.is_debug_types = 1;
5665 if (dwarf2_per_objfile->using_index)
5667 sig_type->per_cu.v.quick =
5668 OBSTACK_ZALLOC (&objfile->objfile_obstack,
5669 struct dwarf2_per_cu_quick_data);
5674 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5677 gdb_assert (*slot == NULL);
5679 /* The rest of sig_type must be filled in by the caller. */
5683 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
5684 Fill in SIG_ENTRY with DWO_ENTRY. */
5687 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
5688 struct signatured_type *sig_entry,
5689 struct dwo_unit *dwo_entry)
5691 /* Make sure we're not clobbering something we don't expect to. */
5692 gdb_assert (! sig_entry->per_cu.queued);
5693 gdb_assert (sig_entry->per_cu.cu == NULL);
5694 if (dwarf2_per_objfile->using_index)
5696 gdb_assert (sig_entry->per_cu.v.quick != NULL);
5697 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
5700 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
5701 gdb_assert (sig_entry->signature == dwo_entry->signature);
5702 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
5703 gdb_assert (sig_entry->type_unit_group == NULL);
5704 gdb_assert (sig_entry->dwo_unit == NULL);
5706 sig_entry->per_cu.section = dwo_entry->section;
5707 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
5708 sig_entry->per_cu.length = dwo_entry->length;
5709 sig_entry->per_cu.reading_dwo_directly = 1;
5710 sig_entry->per_cu.objfile = objfile;
5711 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
5712 sig_entry->dwo_unit = dwo_entry;
5715 /* Subroutine of lookup_signatured_type.
5716 If we haven't read the TU yet, create the signatured_type data structure
5717 for a TU to be read in directly from a DWO file, bypassing the stub.
5718 This is the "Stay in DWO Optimization": When there is no DWP file and we're
5719 using .gdb_index, then when reading a CU we want to stay in the DWO file
5720 containing that CU. Otherwise we could end up reading several other DWO
5721 files (due to comdat folding) to process the transitive closure of all the
5722 mentioned TUs, and that can be slow. The current DWO file will have every
5723 type signature that it needs.
5724 We only do this for .gdb_index because in the psymtab case we already have
5725 to read all the DWOs to build the type unit groups. */
5727 static struct signatured_type *
5728 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5730 struct objfile *objfile = dwarf2_per_objfile->objfile;
5731 struct dwo_file *dwo_file;
5732 struct dwo_unit find_dwo_entry, *dwo_entry;
5733 struct signatured_type find_sig_entry, *sig_entry;
5736 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
5738 /* If TU skeletons have been removed then we may not have read in any
5740 if (dwarf2_per_objfile->signatured_types == NULL)
5742 dwarf2_per_objfile->signatured_types
5743 = allocate_signatured_type_table (objfile);
5746 /* We only ever need to read in one copy of a signatured type.
5747 Use the global signatured_types array to do our own comdat-folding
5748 of types. If this is the first time we're reading this TU, and
5749 the TU has an entry in .gdb_index, replace the recorded data from
5750 .gdb_index with this TU. */
5752 find_sig_entry.signature = sig;
5753 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5754 &find_sig_entry, INSERT);
5755 sig_entry = (struct signatured_type *) *slot;
5757 /* We can get here with the TU already read, *or* in the process of being
5758 read. Don't reassign the global entry to point to this DWO if that's
5759 the case. Also note that if the TU is already being read, it may not
5760 have come from a DWO, the program may be a mix of Fission-compiled
5761 code and non-Fission-compiled code. */
5763 /* Have we already tried to read this TU?
5764 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
5765 needn't exist in the global table yet). */
5766 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
5769 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
5770 dwo_unit of the TU itself. */
5771 dwo_file = cu->dwo_unit->dwo_file;
5773 /* Ok, this is the first time we're reading this TU. */
5774 if (dwo_file->tus == NULL)
5776 find_dwo_entry.signature = sig;
5777 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
5778 if (dwo_entry == NULL)
5781 /* If the global table doesn't have an entry for this TU, add one. */
5782 if (sig_entry == NULL)
5783 sig_entry = add_type_unit (sig, slot);
5785 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
5786 sig_entry->per_cu.tu_read = 1;
5790 /* Subroutine of lookup_signatured_type.
5791 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
5792 then try the DWP file. If the TU stub (skeleton) has been removed then
5793 it won't be in .gdb_index. */
5795 static struct signatured_type *
5796 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5798 struct objfile *objfile = dwarf2_per_objfile->objfile;
5799 struct dwp_file *dwp_file = get_dwp_file ();
5800 struct dwo_unit *dwo_entry;
5801 struct signatured_type find_sig_entry, *sig_entry;
5804 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
5805 gdb_assert (dwp_file != NULL);
5807 /* If TU skeletons have been removed then we may not have read in any
5809 if (dwarf2_per_objfile->signatured_types == NULL)
5811 dwarf2_per_objfile->signatured_types
5812 = allocate_signatured_type_table (objfile);
5815 find_sig_entry.signature = sig;
5816 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5817 &find_sig_entry, INSERT);
5818 sig_entry = (struct signatured_type *) *slot;
5820 /* Have we already tried to read this TU?
5821 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
5822 needn't exist in the global table yet). */
5823 if (sig_entry != NULL)
5826 if (dwp_file->tus == NULL)
5828 dwo_entry = lookup_dwo_unit_in_dwp (dwp_file, NULL,
5829 sig, 1 /* is_debug_types */);
5830 if (dwo_entry == NULL)
5833 sig_entry = add_type_unit (sig, slot);
5834 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
5839 /* Lookup a signature based type for DW_FORM_ref_sig8.
5840 Returns NULL if signature SIG is not present in the table.
5841 It is up to the caller to complain about this. */
5843 static struct signatured_type *
5844 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
5847 && dwarf2_per_objfile->using_index)
5849 /* We're in a DWO/DWP file, and we're using .gdb_index.
5850 These cases require special processing. */
5851 if (get_dwp_file () == NULL)
5852 return lookup_dwo_signatured_type (cu, sig);
5854 return lookup_dwp_signatured_type (cu, sig);
5858 struct signatured_type find_entry, *entry;
5860 if (dwarf2_per_objfile->signatured_types == NULL)
5862 find_entry.signature = sig;
5863 entry = ((struct signatured_type *)
5864 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
5869 /* Low level DIE reading support. */
5871 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
5874 init_cu_die_reader (struct die_reader_specs *reader,
5875 struct dwarf2_cu *cu,
5876 struct dwarf2_section_info *section,
5877 struct dwo_file *dwo_file)
5879 gdb_assert (section->readin && section->buffer != NULL);
5880 reader->abfd = get_section_bfd_owner (section);
5882 reader->dwo_file = dwo_file;
5883 reader->die_section = section;
5884 reader->buffer = section->buffer;
5885 reader->buffer_end = section->buffer + section->size;
5886 reader->comp_dir = NULL;
5889 /* Subroutine of init_cutu_and_read_dies to simplify it.
5890 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
5891 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
5894 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
5895 from it to the DIE in the DWO. If NULL we are skipping the stub.
5896 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
5897 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
5898 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
5899 STUB_COMP_DIR may be non-NULL.
5900 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
5901 are filled in with the info of the DIE from the DWO file.
5902 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
5903 provided an abbrev table to use.
5904 The result is non-zero if a valid (non-dummy) DIE was found. */
5907 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
5908 struct dwo_unit *dwo_unit,
5909 int abbrev_table_provided,
5910 struct die_info *stub_comp_unit_die,
5911 const char *stub_comp_dir,
5912 struct die_reader_specs *result_reader,
5913 const gdb_byte **result_info_ptr,
5914 struct die_info **result_comp_unit_die,
5915 int *result_has_children)
5917 struct objfile *objfile = dwarf2_per_objfile->objfile;
5918 struct dwarf2_cu *cu = this_cu->cu;
5919 struct dwarf2_section_info *section;
5921 const gdb_byte *begin_info_ptr, *info_ptr;
5922 ULONGEST signature; /* Or dwo_id. */
5923 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
5924 int i,num_extra_attrs;
5925 struct dwarf2_section_info *dwo_abbrev_section;
5926 struct attribute *attr;
5927 struct die_info *comp_unit_die;
5929 /* At most one of these may be provided. */
5930 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
5932 /* These attributes aren't processed until later:
5933 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
5934 DW_AT_comp_dir is used now, to find the DWO file, but it is also
5935 referenced later. However, these attributes are found in the stub
5936 which we won't have later. In order to not impose this complication
5937 on the rest of the code, we read them here and copy them to the
5946 if (stub_comp_unit_die != NULL)
5948 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
5950 if (! this_cu->is_debug_types)
5951 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
5952 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
5953 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
5954 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
5955 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
5957 /* There should be a DW_AT_addr_base attribute here (if needed).
5958 We need the value before we can process DW_FORM_GNU_addr_index. */
5960 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
5962 cu->addr_base = DW_UNSND (attr);
5964 /* There should be a DW_AT_ranges_base attribute here (if needed).
5965 We need the value before we can process DW_AT_ranges. */
5966 cu->ranges_base = 0;
5967 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
5969 cu->ranges_base = DW_UNSND (attr);
5971 else if (stub_comp_dir != NULL)
5973 /* Reconstruct the comp_dir attribute to simplify the code below. */
5974 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
5975 comp_dir->name = DW_AT_comp_dir;
5976 comp_dir->form = DW_FORM_string;
5977 DW_STRING_IS_CANONICAL (comp_dir) = 0;
5978 DW_STRING (comp_dir) = stub_comp_dir;
5981 /* Set up for reading the DWO CU/TU. */
5982 cu->dwo_unit = dwo_unit;
5983 section = dwo_unit->section;
5984 dwarf2_read_section (objfile, section);
5985 abfd = get_section_bfd_owner (section);
5986 begin_info_ptr = info_ptr = (section->buffer
5987 + to_underlying (dwo_unit->sect_off));
5988 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
5989 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
5991 if (this_cu->is_debug_types)
5993 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
5995 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5997 info_ptr, rcuh_kind::TYPE);
5998 /* This is not an assert because it can be caused by bad debug info. */
5999 if (sig_type->signature != cu->header.signature)
6001 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
6002 " TU at offset 0x%x [in module %s]"),
6003 hex_string (sig_type->signature),
6004 hex_string (cu->header.signature),
6005 to_underlying (dwo_unit->sect_off),
6006 bfd_get_filename (abfd));
6008 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
6009 /* For DWOs coming from DWP files, we don't know the CU length
6010 nor the type's offset in the TU until now. */
6011 dwo_unit->length = get_cu_length (&cu->header);
6012 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
6014 /* Establish the type offset that can be used to lookup the type.
6015 For DWO files, we don't know it until now. */
6016 sig_type->type_offset_in_section
6017 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
6021 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
6023 info_ptr, rcuh_kind::COMPILE);
6024 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
6025 /* For DWOs coming from DWP files, we don't know the CU length
6027 dwo_unit->length = get_cu_length (&cu->header);
6030 /* Replace the CU's original abbrev table with the DWO's.
6031 Reminder: We can't read the abbrev table until we've read the header. */
6032 if (abbrev_table_provided)
6034 /* Don't free the provided abbrev table, the caller of
6035 init_cutu_and_read_dies owns it. */
6036 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
6037 /* Ensure the DWO abbrev table gets freed. */
6038 make_cleanup (dwarf2_free_abbrev_table, cu);
6042 dwarf2_free_abbrev_table (cu);
6043 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
6044 /* Leave any existing abbrev table cleanup as is. */
6047 /* Read in the die, but leave space to copy over the attributes
6048 from the stub. This has the benefit of simplifying the rest of
6049 the code - all the work to maintain the illusion of a single
6050 DW_TAG_{compile,type}_unit DIE is done here. */
6051 num_extra_attrs = ((stmt_list != NULL)
6055 + (comp_dir != NULL));
6056 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
6057 result_has_children, num_extra_attrs);
6059 /* Copy over the attributes from the stub to the DIE we just read in. */
6060 comp_unit_die = *result_comp_unit_die;
6061 i = comp_unit_die->num_attrs;
6062 if (stmt_list != NULL)
6063 comp_unit_die->attrs[i++] = *stmt_list;
6065 comp_unit_die->attrs[i++] = *low_pc;
6066 if (high_pc != NULL)
6067 comp_unit_die->attrs[i++] = *high_pc;
6069 comp_unit_die->attrs[i++] = *ranges;
6070 if (comp_dir != NULL)
6071 comp_unit_die->attrs[i++] = *comp_dir;
6072 comp_unit_die->num_attrs += num_extra_attrs;
6074 if (dwarf_die_debug)
6076 fprintf_unfiltered (gdb_stdlog,
6077 "Read die from %s@0x%x of %s:\n",
6078 get_section_name (section),
6079 (unsigned) (begin_info_ptr - section->buffer),
6080 bfd_get_filename (abfd));
6081 dump_die (comp_unit_die, dwarf_die_debug);
6084 /* Save the comp_dir attribute. If there is no DWP file then we'll read
6085 TUs by skipping the stub and going directly to the entry in the DWO file.
6086 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
6087 to get it via circuitous means. Blech. */
6088 if (comp_dir != NULL)
6089 result_reader->comp_dir = DW_STRING (comp_dir);
6091 /* Skip dummy compilation units. */
6092 if (info_ptr >= begin_info_ptr + dwo_unit->length
6093 || peek_abbrev_code (abfd, info_ptr) == 0)
6096 *result_info_ptr = info_ptr;
6100 /* Subroutine of init_cutu_and_read_dies to simplify it.
6101 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
6102 Returns NULL if the specified DWO unit cannot be found. */
6104 static struct dwo_unit *
6105 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
6106 struct die_info *comp_unit_die)
6108 struct dwarf2_cu *cu = this_cu->cu;
6109 struct attribute *attr;
6111 struct dwo_unit *dwo_unit;
6112 const char *comp_dir, *dwo_name;
6114 gdb_assert (cu != NULL);
6116 /* Yeah, we look dwo_name up again, but it simplifies the code. */
6117 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
6118 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
6120 if (this_cu->is_debug_types)
6122 struct signatured_type *sig_type;
6124 /* Since this_cu is the first member of struct signatured_type,
6125 we can go from a pointer to one to a pointer to the other. */
6126 sig_type = (struct signatured_type *) this_cu;
6127 signature = sig_type->signature;
6128 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
6132 struct attribute *attr;
6134 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
6136 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
6138 dwo_name, objfile_name (this_cu->objfile));
6139 signature = DW_UNSND (attr);
6140 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
6147 /* Subroutine of init_cutu_and_read_dies to simplify it.
6148 See it for a description of the parameters.
6149 Read a TU directly from a DWO file, bypassing the stub.
6151 Note: This function could be a little bit simpler if we shared cleanups
6152 with our caller, init_cutu_and_read_dies. That's generally a fragile thing
6153 to do, so we keep this function self-contained. Or we could move this
6154 into our caller, but it's complex enough already. */
6157 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
6158 int use_existing_cu, int keep,
6159 die_reader_func_ftype *die_reader_func,
6162 struct dwarf2_cu *cu;
6163 struct signatured_type *sig_type;
6164 struct cleanup *cleanups, *free_cu_cleanup = NULL;
6165 struct die_reader_specs reader;
6166 const gdb_byte *info_ptr;
6167 struct die_info *comp_unit_die;
6170 /* Verify we can do the following downcast, and that we have the
6172 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
6173 sig_type = (struct signatured_type *) this_cu;
6174 gdb_assert (sig_type->dwo_unit != NULL);
6176 cleanups = make_cleanup (null_cleanup, NULL);
6178 if (use_existing_cu && this_cu->cu != NULL)
6180 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
6182 /* There's no need to do the rereading_dwo_cu handling that
6183 init_cutu_and_read_dies does since we don't read the stub. */
6187 /* If !use_existing_cu, this_cu->cu must be NULL. */
6188 gdb_assert (this_cu->cu == NULL);
6189 cu = XNEW (struct dwarf2_cu);
6190 init_one_comp_unit (cu, this_cu);
6191 /* If an error occurs while loading, release our storage. */
6192 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
6195 /* A future optimization, if needed, would be to use an existing
6196 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
6197 could share abbrev tables. */
6199 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
6200 0 /* abbrev_table_provided */,
6201 NULL /* stub_comp_unit_die */,
6202 sig_type->dwo_unit->dwo_file->comp_dir,
6204 &comp_unit_die, &has_children) == 0)
6207 do_cleanups (cleanups);
6211 /* All the "real" work is done here. */
6212 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
6214 /* This duplicates the code in init_cutu_and_read_dies,
6215 but the alternative is making the latter more complex.
6216 This function is only for the special case of using DWO files directly:
6217 no point in overly complicating the general case just to handle this. */
6218 if (free_cu_cleanup != NULL)
6222 /* We've successfully allocated this compilation unit. Let our
6223 caller clean it up when finished with it. */
6224 discard_cleanups (free_cu_cleanup);
6226 /* We can only discard free_cu_cleanup and all subsequent cleanups.
6227 So we have to manually free the abbrev table. */
6228 dwarf2_free_abbrev_table (cu);
6230 /* Link this CU into read_in_chain. */
6231 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
6232 dwarf2_per_objfile->read_in_chain = this_cu;
6235 do_cleanups (free_cu_cleanup);
6238 do_cleanups (cleanups);
6241 /* Initialize a CU (or TU) and read its DIEs.
6242 If the CU defers to a DWO file, read the DWO file as well.
6244 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
6245 Otherwise the table specified in the comp unit header is read in and used.
6246 This is an optimization for when we already have the abbrev table.
6248 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
6249 Otherwise, a new CU is allocated with xmalloc.
6251 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
6252 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
6254 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
6255 linker) then DIE_READER_FUNC will not get called. */
6258 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
6259 struct abbrev_table *abbrev_table,
6260 int use_existing_cu, int keep,
6261 die_reader_func_ftype *die_reader_func,
6264 struct objfile *objfile = dwarf2_per_objfile->objfile;
6265 struct dwarf2_section_info *section = this_cu->section;
6266 bfd *abfd = get_section_bfd_owner (section);
6267 struct dwarf2_cu *cu;
6268 const gdb_byte *begin_info_ptr, *info_ptr;
6269 struct die_reader_specs reader;
6270 struct die_info *comp_unit_die;
6272 struct attribute *attr;
6273 struct cleanup *cleanups, *free_cu_cleanup = NULL;
6274 struct signatured_type *sig_type = NULL;
6275 struct dwarf2_section_info *abbrev_section;
6276 /* Non-zero if CU currently points to a DWO file and we need to
6277 reread it. When this happens we need to reread the skeleton die
6278 before we can reread the DWO file (this only applies to CUs, not TUs). */
6279 int rereading_dwo_cu = 0;
6281 if (dwarf_die_debug)
6282 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
6283 this_cu->is_debug_types ? "type" : "comp",
6284 to_underlying (this_cu->sect_off));
6286 if (use_existing_cu)
6289 /* If we're reading a TU directly from a DWO file, including a virtual DWO
6290 file (instead of going through the stub), short-circuit all of this. */
6291 if (this_cu->reading_dwo_directly)
6293 /* Narrow down the scope of possibilities to have to understand. */
6294 gdb_assert (this_cu->is_debug_types);
6295 gdb_assert (abbrev_table == NULL);
6296 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
6297 die_reader_func, data);
6301 cleanups = make_cleanup (null_cleanup, NULL);
6303 /* This is cheap if the section is already read in. */
6304 dwarf2_read_section (objfile, section);
6306 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
6308 abbrev_section = get_abbrev_section_for_cu (this_cu);
6310 if (use_existing_cu && this_cu->cu != NULL)
6313 /* If this CU is from a DWO file we need to start over, we need to
6314 refetch the attributes from the skeleton CU.
6315 This could be optimized by retrieving those attributes from when we
6316 were here the first time: the previous comp_unit_die was stored in
6317 comp_unit_obstack. But there's no data yet that we need this
6319 if (cu->dwo_unit != NULL)
6320 rereading_dwo_cu = 1;
6324 /* If !use_existing_cu, this_cu->cu must be NULL. */
6325 gdb_assert (this_cu->cu == NULL);
6326 cu = XNEW (struct dwarf2_cu);
6327 init_one_comp_unit (cu, this_cu);
6328 /* If an error occurs while loading, release our storage. */
6329 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
6332 /* Get the header. */
6333 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
6335 /* We already have the header, there's no need to read it in again. */
6336 info_ptr += to_underlying (cu->header.first_die_cu_offset);
6340 if (this_cu->is_debug_types)
6342 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
6343 abbrev_section, info_ptr,
6346 /* Since per_cu is the first member of struct signatured_type,
6347 we can go from a pointer to one to a pointer to the other. */
6348 sig_type = (struct signatured_type *) this_cu;
6349 gdb_assert (sig_type->signature == cu->header.signature);
6350 gdb_assert (sig_type->type_offset_in_tu
6351 == cu->header.type_cu_offset_in_tu);
6352 gdb_assert (this_cu->sect_off == cu->header.sect_off);
6354 /* LENGTH has not been set yet for type units if we're
6355 using .gdb_index. */
6356 this_cu->length = get_cu_length (&cu->header);
6358 /* Establish the type offset that can be used to lookup the type. */
6359 sig_type->type_offset_in_section =
6360 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
6362 this_cu->dwarf_version = cu->header.version;
6366 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
6369 rcuh_kind::COMPILE);
6371 gdb_assert (this_cu->sect_off == cu->header.sect_off);
6372 gdb_assert (this_cu->length == get_cu_length (&cu->header));
6373 this_cu->dwarf_version = cu->header.version;
6377 /* Skip dummy compilation units. */
6378 if (info_ptr >= begin_info_ptr + this_cu->length
6379 || peek_abbrev_code (abfd, info_ptr) == 0)
6381 do_cleanups (cleanups);
6385 /* If we don't have them yet, read the abbrevs for this compilation unit.
6386 And if we need to read them now, make sure they're freed when we're
6387 done. Note that it's important that if the CU had an abbrev table
6388 on entry we don't free it when we're done: Somewhere up the call stack
6389 it may be in use. */
6390 if (abbrev_table != NULL)
6392 gdb_assert (cu->abbrev_table == NULL);
6393 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
6394 cu->abbrev_table = abbrev_table;
6396 else if (cu->abbrev_table == NULL)
6398 dwarf2_read_abbrevs (cu, abbrev_section);
6399 make_cleanup (dwarf2_free_abbrev_table, cu);
6401 else if (rereading_dwo_cu)
6403 dwarf2_free_abbrev_table (cu);
6404 dwarf2_read_abbrevs (cu, abbrev_section);
6407 /* Read the top level CU/TU die. */
6408 init_cu_die_reader (&reader, cu, section, NULL);
6409 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
6411 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
6413 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
6414 DWO CU, that this test will fail (the attribute will not be present). */
6415 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
6418 struct dwo_unit *dwo_unit;
6419 struct die_info *dwo_comp_unit_die;
6423 complaint (&symfile_complaints,
6424 _("compilation unit with DW_AT_GNU_dwo_name"
6425 " has children (offset 0x%x) [in module %s]"),
6426 to_underlying (this_cu->sect_off), bfd_get_filename (abfd));
6428 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
6429 if (dwo_unit != NULL)
6431 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
6432 abbrev_table != NULL,
6433 comp_unit_die, NULL,
6435 &dwo_comp_unit_die, &has_children) == 0)
6438 do_cleanups (cleanups);
6441 comp_unit_die = dwo_comp_unit_die;
6445 /* Yikes, we couldn't find the rest of the DIE, we only have
6446 the stub. A complaint has already been logged. There's
6447 not much more we can do except pass on the stub DIE to
6448 die_reader_func. We don't want to throw an error on bad
6453 /* All of the above is setup for this call. Yikes. */
6454 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
6456 /* Done, clean up. */
6457 if (free_cu_cleanup != NULL)
6461 /* We've successfully allocated this compilation unit. Let our
6462 caller clean it up when finished with it. */
6463 discard_cleanups (free_cu_cleanup);
6465 /* We can only discard free_cu_cleanup and all subsequent cleanups.
6466 So we have to manually free the abbrev table. */
6467 dwarf2_free_abbrev_table (cu);
6469 /* Link this CU into read_in_chain. */
6470 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
6471 dwarf2_per_objfile->read_in_chain = this_cu;
6474 do_cleanups (free_cu_cleanup);
6477 do_cleanups (cleanups);
6480 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
6481 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
6482 to have already done the lookup to find the DWO file).
6484 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
6485 THIS_CU->is_debug_types, but nothing else.
6487 We fill in THIS_CU->length.
6489 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
6490 linker) then DIE_READER_FUNC will not get called.
6492 THIS_CU->cu is always freed when done.
6493 This is done in order to not leave THIS_CU->cu in a state where we have
6494 to care whether it refers to the "main" CU or the DWO CU. */
6497 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
6498 struct dwo_file *dwo_file,
6499 die_reader_func_ftype *die_reader_func,
6502 struct objfile *objfile = dwarf2_per_objfile->objfile;
6503 struct dwarf2_section_info *section = this_cu->section;
6504 bfd *abfd = get_section_bfd_owner (section);
6505 struct dwarf2_section_info *abbrev_section;
6506 struct dwarf2_cu cu;
6507 const gdb_byte *begin_info_ptr, *info_ptr;
6508 struct die_reader_specs reader;
6509 struct cleanup *cleanups;
6510 struct die_info *comp_unit_die;
6513 if (dwarf_die_debug)
6514 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
6515 this_cu->is_debug_types ? "type" : "comp",
6516 to_underlying (this_cu->sect_off));
6518 gdb_assert (this_cu->cu == NULL);
6520 abbrev_section = (dwo_file != NULL
6521 ? &dwo_file->sections.abbrev
6522 : get_abbrev_section_for_cu (this_cu));
6524 /* This is cheap if the section is already read in. */
6525 dwarf2_read_section (objfile, section);
6527 init_one_comp_unit (&cu, this_cu);
6529 cleanups = make_cleanup (free_stack_comp_unit, &cu);
6531 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
6532 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
6533 abbrev_section, info_ptr,
6534 (this_cu->is_debug_types
6536 : rcuh_kind::COMPILE));
6538 this_cu->length = get_cu_length (&cu.header);
6540 /* Skip dummy compilation units. */
6541 if (info_ptr >= begin_info_ptr + this_cu->length
6542 || peek_abbrev_code (abfd, info_ptr) == 0)
6544 do_cleanups (cleanups);
6548 dwarf2_read_abbrevs (&cu, abbrev_section);
6549 make_cleanup (dwarf2_free_abbrev_table, &cu);
6551 init_cu_die_reader (&reader, &cu, section, dwo_file);
6552 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
6554 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
6556 do_cleanups (cleanups);
6559 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
6560 does not lookup the specified DWO file.
6561 This cannot be used to read DWO files.
6563 THIS_CU->cu is always freed when done.
6564 This is done in order to not leave THIS_CU->cu in a state where we have
6565 to care whether it refers to the "main" CU or the DWO CU.
6566 We can revisit this if the data shows there's a performance issue. */
6569 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
6570 die_reader_func_ftype *die_reader_func,
6573 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
6576 /* Type Unit Groups.
6578 Type Unit Groups are a way to collapse the set of all TUs (type units) into
6579 a more manageable set. The grouping is done by DW_AT_stmt_list entry
6580 so that all types coming from the same compilation (.o file) are grouped
6581 together. A future step could be to put the types in the same symtab as
6582 the CU the types ultimately came from. */
6585 hash_type_unit_group (const void *item)
6587 const struct type_unit_group *tu_group
6588 = (const struct type_unit_group *) item;
6590 return hash_stmt_list_entry (&tu_group->hash);
6594 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
6596 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
6597 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
6599 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
6602 /* Allocate a hash table for type unit groups. */
6605 allocate_type_unit_groups_table (void)
6607 return htab_create_alloc_ex (3,
6608 hash_type_unit_group,
6611 &dwarf2_per_objfile->objfile->objfile_obstack,
6612 hashtab_obstack_allocate,
6613 dummy_obstack_deallocate);
6616 /* Type units that don't have DW_AT_stmt_list are grouped into their own
6617 partial symtabs. We combine several TUs per psymtab to not let the size
6618 of any one psymtab grow too big. */
6619 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
6620 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
6622 /* Helper routine for get_type_unit_group.
6623 Create the type_unit_group object used to hold one or more TUs. */
6625 static struct type_unit_group *
6626 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
6628 struct objfile *objfile = dwarf2_per_objfile->objfile;
6629 struct dwarf2_per_cu_data *per_cu;
6630 struct type_unit_group *tu_group;
6632 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6633 struct type_unit_group);
6634 per_cu = &tu_group->per_cu;
6635 per_cu->objfile = objfile;
6637 if (dwarf2_per_objfile->using_index)
6639 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6640 struct dwarf2_per_cu_quick_data);
6644 unsigned int line_offset = to_underlying (line_offset_struct);
6645 struct partial_symtab *pst;
6648 /* Give the symtab a useful name for debug purposes. */
6649 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
6650 name = xstrprintf ("<type_units_%d>",
6651 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
6653 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
6655 pst = create_partial_symtab (per_cu, name);
6661 tu_group->hash.dwo_unit = cu->dwo_unit;
6662 tu_group->hash.line_sect_off = line_offset_struct;
6667 /* Look up the type_unit_group for type unit CU, and create it if necessary.
6668 STMT_LIST is a DW_AT_stmt_list attribute. */
6670 static struct type_unit_group *
6671 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
6673 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6674 struct type_unit_group *tu_group;
6676 unsigned int line_offset;
6677 struct type_unit_group type_unit_group_for_lookup;
6679 if (dwarf2_per_objfile->type_unit_groups == NULL)
6681 dwarf2_per_objfile->type_unit_groups =
6682 allocate_type_unit_groups_table ();
6685 /* Do we need to create a new group, or can we use an existing one? */
6689 line_offset = DW_UNSND (stmt_list);
6690 ++tu_stats->nr_symtab_sharers;
6694 /* Ugh, no stmt_list. Rare, but we have to handle it.
6695 We can do various things here like create one group per TU or
6696 spread them over multiple groups to split up the expansion work.
6697 To avoid worst case scenarios (too many groups or too large groups)
6698 we, umm, group them in bunches. */
6699 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
6700 | (tu_stats->nr_stmt_less_type_units
6701 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
6702 ++tu_stats->nr_stmt_less_type_units;
6705 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
6706 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
6707 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
6708 &type_unit_group_for_lookup, INSERT);
6711 tu_group = (struct type_unit_group *) *slot;
6712 gdb_assert (tu_group != NULL);
6716 sect_offset line_offset_struct = (sect_offset) line_offset;
6717 tu_group = create_type_unit_group (cu, line_offset_struct);
6719 ++tu_stats->nr_symtabs;
6725 /* Partial symbol tables. */
6727 /* Create a psymtab named NAME and assign it to PER_CU.
6729 The caller must fill in the following details:
6730 dirname, textlow, texthigh. */
6732 static struct partial_symtab *
6733 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
6735 struct objfile *objfile = per_cu->objfile;
6736 struct partial_symtab *pst;
6738 pst = start_psymtab_common (objfile, name, 0,
6739 objfile->global_psymbols,
6740 objfile->static_psymbols);
6742 pst->psymtabs_addrmap_supported = 1;
6744 /* This is the glue that links PST into GDB's symbol API. */
6745 pst->read_symtab_private = per_cu;
6746 pst->read_symtab = dwarf2_read_symtab;
6747 per_cu->v.psymtab = pst;
6752 /* The DATA object passed to process_psymtab_comp_unit_reader has this
6755 struct process_psymtab_comp_unit_data
6757 /* True if we are reading a DW_TAG_partial_unit. */
6759 int want_partial_unit;
6761 /* The "pretend" language that is used if the CU doesn't declare a
6764 enum language pretend_language;
6767 /* die_reader_func for process_psymtab_comp_unit. */
6770 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
6771 const gdb_byte *info_ptr,
6772 struct die_info *comp_unit_die,
6776 struct dwarf2_cu *cu = reader->cu;
6777 struct objfile *objfile = cu->objfile;
6778 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6779 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6781 CORE_ADDR best_lowpc = 0, best_highpc = 0;
6782 struct partial_symtab *pst;
6783 enum pc_bounds_kind cu_bounds_kind;
6784 const char *filename;
6785 struct process_psymtab_comp_unit_data *info
6786 = (struct process_psymtab_comp_unit_data *) data;
6788 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
6791 gdb_assert (! per_cu->is_debug_types);
6793 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
6795 cu->list_in_scope = &file_symbols;
6797 /* Allocate a new partial symbol table structure. */
6798 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
6799 if (filename == NULL)
6802 pst = create_partial_symtab (per_cu, filename);
6804 /* This must be done before calling dwarf2_build_include_psymtabs. */
6805 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
6807 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6809 dwarf2_find_base_address (comp_unit_die, cu);
6811 /* Possibly set the default values of LOWPC and HIGHPC from
6813 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
6814 &best_highpc, cu, pst);
6815 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
6816 /* Store the contiguous range if it is not empty; it can be empty for
6817 CUs with no code. */
6818 addrmap_set_empty (objfile->psymtabs_addrmap,
6819 gdbarch_adjust_dwarf2_addr (gdbarch,
6820 best_lowpc + baseaddr),
6821 gdbarch_adjust_dwarf2_addr (gdbarch,
6822 best_highpc + baseaddr) - 1,
6825 /* Check if comp unit has_children.
6826 If so, read the rest of the partial symbols from this comp unit.
6827 If not, there's no more debug_info for this comp unit. */
6830 struct partial_die_info *first_die;
6831 CORE_ADDR lowpc, highpc;
6833 lowpc = ((CORE_ADDR) -1);
6834 highpc = ((CORE_ADDR) 0);
6836 first_die = load_partial_dies (reader, info_ptr, 1);
6838 scan_partial_symbols (first_die, &lowpc, &highpc,
6839 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
6841 /* If we didn't find a lowpc, set it to highpc to avoid
6842 complaints from `maint check'. */
6843 if (lowpc == ((CORE_ADDR) -1))
6846 /* If the compilation unit didn't have an explicit address range,
6847 then use the information extracted from its child dies. */
6848 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
6851 best_highpc = highpc;
6854 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
6855 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
6857 end_psymtab_common (objfile, pst);
6859 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
6862 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6863 struct dwarf2_per_cu_data *iter;
6865 /* Fill in 'dependencies' here; we fill in 'users' in a
6867 pst->number_of_dependencies = len;
6869 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
6871 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
6874 pst->dependencies[i] = iter->v.psymtab;
6876 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
6879 /* Get the list of files included in the current compilation unit,
6880 and build a psymtab for each of them. */
6881 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
6883 if (dwarf_read_debug)
6885 struct gdbarch *gdbarch = get_objfile_arch (objfile);
6887 fprintf_unfiltered (gdb_stdlog,
6888 "Psymtab for %s unit @0x%x: %s - %s"
6889 ", %d global, %d static syms\n",
6890 per_cu->is_debug_types ? "type" : "comp",
6891 to_underlying (per_cu->sect_off),
6892 paddress (gdbarch, pst->textlow),
6893 paddress (gdbarch, pst->texthigh),
6894 pst->n_global_syms, pst->n_static_syms);
6898 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
6899 Process compilation unit THIS_CU for a psymtab. */
6902 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
6903 int want_partial_unit,
6904 enum language pretend_language)
6906 /* If this compilation unit was already read in, free the
6907 cached copy in order to read it in again. This is
6908 necessary because we skipped some symbols when we first
6909 read in the compilation unit (see load_partial_dies).
6910 This problem could be avoided, but the benefit is unclear. */
6911 if (this_cu->cu != NULL)
6912 free_one_cached_comp_unit (this_cu);
6914 if (this_cu->is_debug_types)
6915 init_cutu_and_read_dies (this_cu, NULL, 0, 0, build_type_psymtabs_reader,
6919 process_psymtab_comp_unit_data info;
6920 info.want_partial_unit = want_partial_unit;
6921 info.pretend_language = pretend_language;
6922 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
6923 process_psymtab_comp_unit_reader, &info);
6926 /* Age out any secondary CUs. */
6927 age_cached_comp_units ();
6930 /* Reader function for build_type_psymtabs. */
6933 build_type_psymtabs_reader (const struct die_reader_specs *reader,
6934 const gdb_byte *info_ptr,
6935 struct die_info *type_unit_die,
6939 struct objfile *objfile = dwarf2_per_objfile->objfile;
6940 struct dwarf2_cu *cu = reader->cu;
6941 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
6942 struct signatured_type *sig_type;
6943 struct type_unit_group *tu_group;
6944 struct attribute *attr;
6945 struct partial_die_info *first_die;
6946 CORE_ADDR lowpc, highpc;
6947 struct partial_symtab *pst;
6949 gdb_assert (data == NULL);
6950 gdb_assert (per_cu->is_debug_types);
6951 sig_type = (struct signatured_type *) per_cu;
6956 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
6957 tu_group = get_type_unit_group (cu, attr);
6959 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
6961 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
6962 cu->list_in_scope = &file_symbols;
6963 pst = create_partial_symtab (per_cu, "");
6966 first_die = load_partial_dies (reader, info_ptr, 1);
6968 lowpc = (CORE_ADDR) -1;
6969 highpc = (CORE_ADDR) 0;
6970 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
6972 end_psymtab_common (objfile, pst);
6975 /* Struct used to sort TUs by their abbreviation table offset. */
6977 struct tu_abbrev_offset
6979 struct signatured_type *sig_type;
6980 sect_offset abbrev_offset;
6983 /* Helper routine for build_type_psymtabs_1, passed to qsort. */
6986 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
6988 const struct tu_abbrev_offset * const *a
6989 = (const struct tu_abbrev_offset * const*) ap;
6990 const struct tu_abbrev_offset * const *b
6991 = (const struct tu_abbrev_offset * const*) bp;
6992 sect_offset aoff = (*a)->abbrev_offset;
6993 sect_offset boff = (*b)->abbrev_offset;
6995 return (aoff > boff) - (aoff < boff);
6998 /* Efficiently read all the type units.
6999 This does the bulk of the work for build_type_psymtabs.
7001 The efficiency is because we sort TUs by the abbrev table they use and
7002 only read each abbrev table once. In one program there are 200K TUs
7003 sharing 8K abbrev tables.
7005 The main purpose of this function is to support building the
7006 dwarf2_per_objfile->type_unit_groups table.
7007 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
7008 can collapse the search space by grouping them by stmt_list.
7009 The savings can be significant, in the same program from above the 200K TUs
7010 share 8K stmt_list tables.
7012 FUNC is expected to call get_type_unit_group, which will create the
7013 struct type_unit_group if necessary and add it to
7014 dwarf2_per_objfile->type_unit_groups. */
7017 build_type_psymtabs_1 (void)
7019 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
7020 struct cleanup *cleanups;
7021 struct abbrev_table *abbrev_table;
7022 sect_offset abbrev_offset;
7023 struct tu_abbrev_offset *sorted_by_abbrev;
7026 /* It's up to the caller to not call us multiple times. */
7027 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
7029 if (dwarf2_per_objfile->n_type_units == 0)
7032 /* TUs typically share abbrev tables, and there can be way more TUs than
7033 abbrev tables. Sort by abbrev table to reduce the number of times we
7034 read each abbrev table in.
7035 Alternatives are to punt or to maintain a cache of abbrev tables.
7036 This is simpler and efficient enough for now.
7038 Later we group TUs by their DW_AT_stmt_list value (as this defines the
7039 symtab to use). Typically TUs with the same abbrev offset have the same
7040 stmt_list value too so in practice this should work well.
7042 The basic algorithm here is:
7044 sort TUs by abbrev table
7045 for each TU with same abbrev table:
7046 read abbrev table if first user
7047 read TU top level DIE
7048 [IWBN if DWO skeletons had DW_AT_stmt_list]
7051 if (dwarf_read_debug)
7052 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
7054 /* Sort in a separate table to maintain the order of all_type_units
7055 for .gdb_index: TU indices directly index all_type_units. */
7056 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
7057 dwarf2_per_objfile->n_type_units);
7058 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
7060 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
7062 sorted_by_abbrev[i].sig_type = sig_type;
7063 sorted_by_abbrev[i].abbrev_offset =
7064 read_abbrev_offset (sig_type->per_cu.section,
7065 sig_type->per_cu.sect_off);
7067 cleanups = make_cleanup (xfree, sorted_by_abbrev);
7068 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
7069 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
7071 abbrev_offset = (sect_offset) ~(unsigned) 0;
7072 abbrev_table = NULL;
7073 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
7075 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
7077 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
7079 /* Switch to the next abbrev table if necessary. */
7080 if (abbrev_table == NULL
7081 || tu->abbrev_offset != abbrev_offset)
7083 if (abbrev_table != NULL)
7085 abbrev_table_free (abbrev_table);
7086 /* Reset to NULL in case abbrev_table_read_table throws
7087 an error: abbrev_table_free_cleanup will get called. */
7088 abbrev_table = NULL;
7090 abbrev_offset = tu->abbrev_offset;
7092 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
7094 ++tu_stats->nr_uniq_abbrev_tables;
7097 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
7098 build_type_psymtabs_reader, NULL);
7101 do_cleanups (cleanups);
7104 /* Print collected type unit statistics. */
7107 print_tu_stats (void)
7109 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
7111 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
7112 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
7113 dwarf2_per_objfile->n_type_units);
7114 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
7115 tu_stats->nr_uniq_abbrev_tables);
7116 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
7117 tu_stats->nr_symtabs);
7118 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
7119 tu_stats->nr_symtab_sharers);
7120 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
7121 tu_stats->nr_stmt_less_type_units);
7122 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
7123 tu_stats->nr_all_type_units_reallocs);
7126 /* Traversal function for build_type_psymtabs. */
7129 build_type_psymtab_dependencies (void **slot, void *info)
7131 struct objfile *objfile = dwarf2_per_objfile->objfile;
7132 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
7133 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
7134 struct partial_symtab *pst = per_cu->v.psymtab;
7135 int len = VEC_length (sig_type_ptr, tu_group->tus);
7136 struct signatured_type *iter;
7139 gdb_assert (len > 0);
7140 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
7142 pst->number_of_dependencies = len;
7144 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
7146 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
7149 gdb_assert (iter->per_cu.is_debug_types);
7150 pst->dependencies[i] = iter->per_cu.v.psymtab;
7151 iter->type_unit_group = tu_group;
7154 VEC_free (sig_type_ptr, tu_group->tus);
7159 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
7160 Build partial symbol tables for the .debug_types comp-units. */
7163 build_type_psymtabs (struct objfile *objfile)
7165 if (! create_all_type_units (objfile))
7168 build_type_psymtabs_1 ();
7171 /* Traversal function for process_skeletonless_type_unit.
7172 Read a TU in a DWO file and build partial symbols for it. */
7175 process_skeletonless_type_unit (void **slot, void *info)
7177 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
7178 struct objfile *objfile = (struct objfile *) info;
7179 struct signatured_type find_entry, *entry;
7181 /* If this TU doesn't exist in the global table, add it and read it in. */
7183 if (dwarf2_per_objfile->signatured_types == NULL)
7185 dwarf2_per_objfile->signatured_types
7186 = allocate_signatured_type_table (objfile);
7189 find_entry.signature = dwo_unit->signature;
7190 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
7192 /* If we've already seen this type there's nothing to do. What's happening
7193 is we're doing our own version of comdat-folding here. */
7197 /* This does the job that create_all_type_units would have done for
7199 entry = add_type_unit (dwo_unit->signature, slot);
7200 fill_in_sig_entry_from_dwo_entry (objfile, entry, dwo_unit);
7203 /* This does the job that build_type_psymtabs_1 would have done. */
7204 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0,
7205 build_type_psymtabs_reader, NULL);
7210 /* Traversal function for process_skeletonless_type_units. */
7213 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
7215 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
7217 if (dwo_file->tus != NULL)
7219 htab_traverse_noresize (dwo_file->tus,
7220 process_skeletonless_type_unit, info);
7226 /* Scan all TUs of DWO files, verifying we've processed them.
7227 This is needed in case a TU was emitted without its skeleton.
7228 Note: This can't be done until we know what all the DWO files are. */
7231 process_skeletonless_type_units (struct objfile *objfile)
7233 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
7234 if (get_dwp_file () == NULL
7235 && dwarf2_per_objfile->dwo_files != NULL)
7237 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
7238 process_dwo_file_for_skeletonless_type_units,
7243 /* Compute the 'user' field for each psymtab in OBJFILE. */
7246 set_partial_user (struct objfile *objfile)
7250 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
7252 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
7253 struct partial_symtab *pst = per_cu->v.psymtab;
7259 for (j = 0; j < pst->number_of_dependencies; ++j)
7261 /* Set the 'user' field only if it is not already set. */
7262 if (pst->dependencies[j]->user == NULL)
7263 pst->dependencies[j]->user = pst;
7268 /* Build the partial symbol table by doing a quick pass through the
7269 .debug_info and .debug_abbrev sections. */
7272 dwarf2_build_psymtabs_hard (struct objfile *objfile)
7274 struct cleanup *back_to;
7277 if (dwarf_read_debug)
7279 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
7280 objfile_name (objfile));
7283 dwarf2_per_objfile->reading_partial_symbols = 1;
7285 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
7287 /* Any cached compilation units will be linked by the per-objfile
7288 read_in_chain. Make sure to free them when we're done. */
7289 back_to = make_cleanup (free_cached_comp_units, NULL);
7291 build_type_psymtabs (objfile);
7293 create_all_comp_units (objfile);
7295 /* Create a temporary address map on a temporary obstack. We later
7296 copy this to the final obstack. */
7297 auto_obstack temp_obstack;
7299 scoped_restore save_psymtabs_addrmap
7300 = make_scoped_restore (&objfile->psymtabs_addrmap,
7301 addrmap_create_mutable (&temp_obstack));
7303 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
7305 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
7307 process_psymtab_comp_unit (per_cu, 0, language_minimal);
7310 /* This has to wait until we read the CUs, we need the list of DWOs. */
7311 process_skeletonless_type_units (objfile);
7313 /* Now that all TUs have been processed we can fill in the dependencies. */
7314 if (dwarf2_per_objfile->type_unit_groups != NULL)
7316 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
7317 build_type_psymtab_dependencies, NULL);
7320 if (dwarf_read_debug)
7323 set_partial_user (objfile);
7325 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
7326 &objfile->objfile_obstack);
7327 /* At this point we want to keep the address map. */
7328 save_psymtabs_addrmap.release ();
7330 do_cleanups (back_to);
7332 if (dwarf_read_debug)
7333 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
7334 objfile_name (objfile));
7337 /* die_reader_func for load_partial_comp_unit. */
7340 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
7341 const gdb_byte *info_ptr,
7342 struct die_info *comp_unit_die,
7346 struct dwarf2_cu *cu = reader->cu;
7348 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
7350 /* Check if comp unit has_children.
7351 If so, read the rest of the partial symbols from this comp unit.
7352 If not, there's no more debug_info for this comp unit. */
7354 load_partial_dies (reader, info_ptr, 0);
7357 /* Load the partial DIEs for a secondary CU into memory.
7358 This is also used when rereading a primary CU with load_all_dies. */
7361 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
7363 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7364 load_partial_comp_unit_reader, NULL);
7368 read_comp_units_from_section (struct objfile *objfile,
7369 struct dwarf2_section_info *section,
7370 struct dwarf2_section_info *abbrev_section,
7371 unsigned int is_dwz,
7374 struct dwarf2_per_cu_data ***all_comp_units)
7376 const gdb_byte *info_ptr;
7377 bfd *abfd = get_section_bfd_owner (section);
7379 if (dwarf_read_debug)
7380 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
7381 get_section_name (section),
7382 get_section_file_name (section));
7384 dwarf2_read_section (objfile, section);
7386 info_ptr = section->buffer;
7388 while (info_ptr < section->buffer + section->size)
7390 struct dwarf2_per_cu_data *this_cu;
7392 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
7394 comp_unit_head cu_header;
7395 read_and_check_comp_unit_head (&cu_header, section, abbrev_section,
7396 info_ptr, rcuh_kind::COMPILE);
7398 /* Save the compilation unit for later lookup. */
7399 if (cu_header.unit_type != DW_UT_type)
7401 this_cu = XOBNEW (&objfile->objfile_obstack,
7402 struct dwarf2_per_cu_data);
7403 memset (this_cu, 0, sizeof (*this_cu));
7407 auto sig_type = XOBNEW (&objfile->objfile_obstack,
7408 struct signatured_type);
7409 memset (sig_type, 0, sizeof (*sig_type));
7410 sig_type->signature = cu_header.signature;
7411 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
7412 this_cu = &sig_type->per_cu;
7414 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
7415 this_cu->sect_off = sect_off;
7416 this_cu->length = cu_header.length + cu_header.initial_length_size;
7417 this_cu->is_dwz = is_dwz;
7418 this_cu->objfile = objfile;
7419 this_cu->section = section;
7421 if (*n_comp_units == *n_allocated)
7424 *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *,
7425 *all_comp_units, *n_allocated);
7427 (*all_comp_units)[*n_comp_units] = this_cu;
7430 info_ptr = info_ptr + this_cu->length;
7434 /* Create a list of all compilation units in OBJFILE.
7435 This is only done for -readnow and building partial symtabs. */
7438 create_all_comp_units (struct objfile *objfile)
7442 struct dwarf2_per_cu_data **all_comp_units;
7443 struct dwz_file *dwz;
7447 all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated);
7449 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info,
7450 &dwarf2_per_objfile->abbrev, 0,
7451 &n_allocated, &n_comp_units, &all_comp_units);
7453 dwz = dwarf2_get_dwz_file ();
7455 read_comp_units_from_section (objfile, &dwz->info, &dwz->abbrev, 1,
7456 &n_allocated, &n_comp_units,
7459 dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack,
7460 struct dwarf2_per_cu_data *,
7462 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
7463 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
7464 xfree (all_comp_units);
7465 dwarf2_per_objfile->n_comp_units = n_comp_units;
7468 /* Process all loaded DIEs for compilation unit CU, starting at
7469 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
7470 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
7471 DW_AT_ranges). See the comments of add_partial_subprogram on how
7472 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
7475 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
7476 CORE_ADDR *highpc, int set_addrmap,
7477 struct dwarf2_cu *cu)
7479 struct partial_die_info *pdi;
7481 /* Now, march along the PDI's, descending into ones which have
7482 interesting children but skipping the children of the other ones,
7483 until we reach the end of the compilation unit. */
7489 fixup_partial_die (pdi, cu);
7491 /* Anonymous namespaces or modules have no name but have interesting
7492 children, so we need to look at them. Ditto for anonymous
7495 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
7496 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
7497 || pdi->tag == DW_TAG_imported_unit)
7501 case DW_TAG_subprogram:
7502 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
7504 case DW_TAG_constant:
7505 case DW_TAG_variable:
7506 case DW_TAG_typedef:
7507 case DW_TAG_union_type:
7508 if (!pdi->is_declaration)
7510 add_partial_symbol (pdi, cu);
7513 case DW_TAG_class_type:
7514 case DW_TAG_interface_type:
7515 case DW_TAG_structure_type:
7516 if (!pdi->is_declaration)
7518 add_partial_symbol (pdi, cu);
7520 if (cu->language == language_rust && pdi->has_children)
7521 scan_partial_symbols (pdi->die_child, lowpc, highpc,
7524 case DW_TAG_enumeration_type:
7525 if (!pdi->is_declaration)
7526 add_partial_enumeration (pdi, cu);
7528 case DW_TAG_base_type:
7529 case DW_TAG_subrange_type:
7530 /* File scope base type definitions are added to the partial
7532 add_partial_symbol (pdi, cu);
7534 case DW_TAG_namespace:
7535 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
7538 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
7540 case DW_TAG_imported_unit:
7542 struct dwarf2_per_cu_data *per_cu;
7544 /* For now we don't handle imported units in type units. */
7545 if (cu->per_cu->is_debug_types)
7547 error (_("Dwarf Error: DW_TAG_imported_unit is not"
7548 " supported in type units [in module %s]"),
7549 objfile_name (cu->objfile));
7552 per_cu = dwarf2_find_containing_comp_unit (pdi->d.sect_off,
7556 /* Go read the partial unit, if needed. */
7557 if (per_cu->v.psymtab == NULL)
7558 process_psymtab_comp_unit (per_cu, 1, cu->language);
7560 VEC_safe_push (dwarf2_per_cu_ptr,
7561 cu->per_cu->imported_symtabs, per_cu);
7564 case DW_TAG_imported_declaration:
7565 add_partial_symbol (pdi, cu);
7572 /* If the die has a sibling, skip to the sibling. */
7574 pdi = pdi->die_sibling;
7578 /* Functions used to compute the fully scoped name of a partial DIE.
7580 Normally, this is simple. For C++, the parent DIE's fully scoped
7581 name is concatenated with "::" and the partial DIE's name.
7582 Enumerators are an exception; they use the scope of their parent
7583 enumeration type, i.e. the name of the enumeration type is not
7584 prepended to the enumerator.
7586 There are two complexities. One is DW_AT_specification; in this
7587 case "parent" means the parent of the target of the specification,
7588 instead of the direct parent of the DIE. The other is compilers
7589 which do not emit DW_TAG_namespace; in this case we try to guess
7590 the fully qualified name of structure types from their members'
7591 linkage names. This must be done using the DIE's children rather
7592 than the children of any DW_AT_specification target. We only need
7593 to do this for structures at the top level, i.e. if the target of
7594 any DW_AT_specification (if any; otherwise the DIE itself) does not
7597 /* Compute the scope prefix associated with PDI's parent, in
7598 compilation unit CU. The result will be allocated on CU's
7599 comp_unit_obstack, or a copy of the already allocated PDI->NAME
7600 field. NULL is returned if no prefix is necessary. */
7602 partial_die_parent_scope (struct partial_die_info *pdi,
7603 struct dwarf2_cu *cu)
7605 const char *grandparent_scope;
7606 struct partial_die_info *parent, *real_pdi;
7608 /* We need to look at our parent DIE; if we have a DW_AT_specification,
7609 then this means the parent of the specification DIE. */
7612 while (real_pdi->has_specification)
7613 real_pdi = find_partial_die (real_pdi->spec_offset,
7614 real_pdi->spec_is_dwz, cu);
7616 parent = real_pdi->die_parent;
7620 if (parent->scope_set)
7621 return parent->scope;
7623 fixup_partial_die (parent, cu);
7625 grandparent_scope = partial_die_parent_scope (parent, cu);
7627 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
7628 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
7629 Work around this problem here. */
7630 if (cu->language == language_cplus
7631 && parent->tag == DW_TAG_namespace
7632 && strcmp (parent->name, "::") == 0
7633 && grandparent_scope == NULL)
7635 parent->scope = NULL;
7636 parent->scope_set = 1;
7640 if (pdi->tag == DW_TAG_enumerator)
7641 /* Enumerators should not get the name of the enumeration as a prefix. */
7642 parent->scope = grandparent_scope;
7643 else if (parent->tag == DW_TAG_namespace
7644 || parent->tag == DW_TAG_module
7645 || parent->tag == DW_TAG_structure_type
7646 || parent->tag == DW_TAG_class_type
7647 || parent->tag == DW_TAG_interface_type
7648 || parent->tag == DW_TAG_union_type
7649 || parent->tag == DW_TAG_enumeration_type)
7651 if (grandparent_scope == NULL)
7652 parent->scope = parent->name;
7654 parent->scope = typename_concat (&cu->comp_unit_obstack,
7656 parent->name, 0, cu);
7660 /* FIXME drow/2004-04-01: What should we be doing with
7661 function-local names? For partial symbols, we should probably be
7663 complaint (&symfile_complaints,
7664 _("unhandled containing DIE tag %d for DIE at %d"),
7665 parent->tag, to_underlying (pdi->sect_off));
7666 parent->scope = grandparent_scope;
7669 parent->scope_set = 1;
7670 return parent->scope;
7673 /* Return the fully scoped name associated with PDI, from compilation unit
7674 CU. The result will be allocated with malloc. */
7677 partial_die_full_name (struct partial_die_info *pdi,
7678 struct dwarf2_cu *cu)
7680 const char *parent_scope;
7682 /* If this is a template instantiation, we can not work out the
7683 template arguments from partial DIEs. So, unfortunately, we have
7684 to go through the full DIEs. At least any work we do building
7685 types here will be reused if full symbols are loaded later. */
7686 if (pdi->has_template_arguments)
7688 fixup_partial_die (pdi, cu);
7690 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
7692 struct die_info *die;
7693 struct attribute attr;
7694 struct dwarf2_cu *ref_cu = cu;
7696 /* DW_FORM_ref_addr is using section offset. */
7697 attr.name = (enum dwarf_attribute) 0;
7698 attr.form = DW_FORM_ref_addr;
7699 attr.u.unsnd = to_underlying (pdi->sect_off);
7700 die = follow_die_ref (NULL, &attr, &ref_cu);
7702 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
7706 parent_scope = partial_die_parent_scope (pdi, cu);
7707 if (parent_scope == NULL)
7710 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
7714 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
7716 struct objfile *objfile = cu->objfile;
7717 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7719 const char *actual_name = NULL;
7721 char *built_actual_name;
7723 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7725 built_actual_name = partial_die_full_name (pdi, cu);
7726 if (built_actual_name != NULL)
7727 actual_name = built_actual_name;
7729 if (actual_name == NULL)
7730 actual_name = pdi->name;
7734 case DW_TAG_subprogram:
7735 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
7736 if (pdi->is_external || cu->language == language_ada)
7738 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
7739 of the global scope. But in Ada, we want to be able to access
7740 nested procedures globally. So all Ada subprograms are stored
7741 in the global scope. */
7742 add_psymbol_to_list (actual_name, strlen (actual_name),
7743 built_actual_name != NULL,
7744 VAR_DOMAIN, LOC_BLOCK,
7745 &objfile->global_psymbols,
7746 addr, cu->language, objfile);
7750 add_psymbol_to_list (actual_name, strlen (actual_name),
7751 built_actual_name != NULL,
7752 VAR_DOMAIN, LOC_BLOCK,
7753 &objfile->static_psymbols,
7754 addr, cu->language, objfile);
7757 if (pdi->main_subprogram && actual_name != NULL)
7758 set_objfile_main_name (objfile, actual_name, cu->language);
7760 case DW_TAG_constant:
7762 std::vector<partial_symbol *> *list;
7764 if (pdi->is_external)
7765 list = &objfile->global_psymbols;
7767 list = &objfile->static_psymbols;
7768 add_psymbol_to_list (actual_name, strlen (actual_name),
7769 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
7770 list, 0, cu->language, objfile);
7773 case DW_TAG_variable:
7775 addr = decode_locdesc (pdi->d.locdesc, cu);
7779 && !dwarf2_per_objfile->has_section_at_zero)
7781 /* A global or static variable may also have been stripped
7782 out by the linker if unused, in which case its address
7783 will be nullified; do not add such variables into partial
7784 symbol table then. */
7786 else if (pdi->is_external)
7789 Don't enter into the minimal symbol tables as there is
7790 a minimal symbol table entry from the ELF symbols already.
7791 Enter into partial symbol table if it has a location
7792 descriptor or a type.
7793 If the location descriptor is missing, new_symbol will create
7794 a LOC_UNRESOLVED symbol, the address of the variable will then
7795 be determined from the minimal symbol table whenever the variable
7797 The address for the partial symbol table entry is not
7798 used by GDB, but it comes in handy for debugging partial symbol
7801 if (pdi->d.locdesc || pdi->has_type)
7802 add_psymbol_to_list (actual_name, strlen (actual_name),
7803 built_actual_name != NULL,
7804 VAR_DOMAIN, LOC_STATIC,
7805 &objfile->global_psymbols,
7807 cu->language, objfile);
7811 int has_loc = pdi->d.locdesc != NULL;
7813 /* Static Variable. Skip symbols whose value we cannot know (those
7814 without location descriptors or constant values). */
7815 if (!has_loc && !pdi->has_const_value)
7817 xfree (built_actual_name);
7821 add_psymbol_to_list (actual_name, strlen (actual_name),
7822 built_actual_name != NULL,
7823 VAR_DOMAIN, LOC_STATIC,
7824 &objfile->static_psymbols,
7825 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
7826 cu->language, objfile);
7829 case DW_TAG_typedef:
7830 case DW_TAG_base_type:
7831 case DW_TAG_subrange_type:
7832 add_psymbol_to_list (actual_name, strlen (actual_name),
7833 built_actual_name != NULL,
7834 VAR_DOMAIN, LOC_TYPEDEF,
7835 &objfile->static_psymbols,
7836 0, cu->language, objfile);
7838 case DW_TAG_imported_declaration:
7839 case DW_TAG_namespace:
7840 add_psymbol_to_list (actual_name, strlen (actual_name),
7841 built_actual_name != NULL,
7842 VAR_DOMAIN, LOC_TYPEDEF,
7843 &objfile->global_psymbols,
7844 0, cu->language, objfile);
7847 add_psymbol_to_list (actual_name, strlen (actual_name),
7848 built_actual_name != NULL,
7849 MODULE_DOMAIN, LOC_TYPEDEF,
7850 &objfile->global_psymbols,
7851 0, cu->language, objfile);
7853 case DW_TAG_class_type:
7854 case DW_TAG_interface_type:
7855 case DW_TAG_structure_type:
7856 case DW_TAG_union_type:
7857 case DW_TAG_enumeration_type:
7858 /* Skip external references. The DWARF standard says in the section
7859 about "Structure, Union, and Class Type Entries": "An incomplete
7860 structure, union or class type is represented by a structure,
7861 union or class entry that does not have a byte size attribute
7862 and that has a DW_AT_declaration attribute." */
7863 if (!pdi->has_byte_size && pdi->is_declaration)
7865 xfree (built_actual_name);
7869 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
7870 static vs. global. */
7871 add_psymbol_to_list (actual_name, strlen (actual_name),
7872 built_actual_name != NULL,
7873 STRUCT_DOMAIN, LOC_TYPEDEF,
7874 cu->language == language_cplus
7875 ? &objfile->global_psymbols
7876 : &objfile->static_psymbols,
7877 0, cu->language, objfile);
7880 case DW_TAG_enumerator:
7881 add_psymbol_to_list (actual_name, strlen (actual_name),
7882 built_actual_name != NULL,
7883 VAR_DOMAIN, LOC_CONST,
7884 cu->language == language_cplus
7885 ? &objfile->global_psymbols
7886 : &objfile->static_psymbols,
7887 0, cu->language, objfile);
7893 xfree (built_actual_name);
7896 /* Read a partial die corresponding to a namespace; also, add a symbol
7897 corresponding to that namespace to the symbol table. NAMESPACE is
7898 the name of the enclosing namespace. */
7901 add_partial_namespace (struct partial_die_info *pdi,
7902 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7903 int set_addrmap, struct dwarf2_cu *cu)
7905 /* Add a symbol for the namespace. */
7907 add_partial_symbol (pdi, cu);
7909 /* Now scan partial symbols in that namespace. */
7911 if (pdi->has_children)
7912 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7915 /* Read a partial die corresponding to a Fortran module. */
7918 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
7919 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
7921 /* Add a symbol for the namespace. */
7923 add_partial_symbol (pdi, cu);
7925 /* Now scan partial symbols in that module. */
7927 if (pdi->has_children)
7928 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
7931 /* Read a partial die corresponding to a subprogram and create a partial
7932 symbol for that subprogram. When the CU language allows it, this
7933 routine also defines a partial symbol for each nested subprogram
7934 that this subprogram contains. If SET_ADDRMAP is true, record the
7935 covered ranges in the addrmap. Set *LOWPC and *HIGHPC to the lowest
7936 and highest PC values found in PDI.
7938 PDI may also be a lexical block, in which case we simply search
7939 recursively for subprograms defined inside that lexical block.
7940 Again, this is only performed when the CU language allows this
7941 type of definitions. */
7944 add_partial_subprogram (struct partial_die_info *pdi,
7945 CORE_ADDR *lowpc, CORE_ADDR *highpc,
7946 int set_addrmap, struct dwarf2_cu *cu)
7948 if (pdi->tag == DW_TAG_subprogram)
7950 if (pdi->has_pc_info)
7952 if (pdi->lowpc < *lowpc)
7953 *lowpc = pdi->lowpc;
7954 if (pdi->highpc > *highpc)
7955 *highpc = pdi->highpc;
7958 struct objfile *objfile = cu->objfile;
7959 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7964 baseaddr = ANOFFSET (objfile->section_offsets,
7965 SECT_OFF_TEXT (objfile));
7966 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7967 pdi->lowpc + baseaddr);
7968 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
7969 pdi->highpc + baseaddr);
7970 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
7971 cu->per_cu->v.psymtab);
7975 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
7977 if (!pdi->is_declaration)
7978 /* Ignore subprogram DIEs that do not have a name, they are
7979 illegal. Do not emit a complaint at this point, we will
7980 do so when we convert this psymtab into a symtab. */
7982 add_partial_symbol (pdi, cu);
7986 if (! pdi->has_children)
7989 if (cu->language == language_ada)
7991 pdi = pdi->die_child;
7994 fixup_partial_die (pdi, cu);
7995 if (pdi->tag == DW_TAG_subprogram
7996 || pdi->tag == DW_TAG_lexical_block)
7997 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
7998 pdi = pdi->die_sibling;
8003 /* Read a partial die corresponding to an enumeration type. */
8006 add_partial_enumeration (struct partial_die_info *enum_pdi,
8007 struct dwarf2_cu *cu)
8009 struct partial_die_info *pdi;
8011 if (enum_pdi->name != NULL)
8012 add_partial_symbol (enum_pdi, cu);
8014 pdi = enum_pdi->die_child;
8017 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
8018 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
8020 add_partial_symbol (pdi, cu);
8021 pdi = pdi->die_sibling;
8025 /* Return the initial uleb128 in the die at INFO_PTR. */
8028 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
8030 unsigned int bytes_read;
8032 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
8035 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
8036 Return the corresponding abbrev, or NULL if the number is zero (indicating
8037 an empty DIE). In either case *BYTES_READ will be set to the length of
8038 the initial number. */
8040 static struct abbrev_info *
8041 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
8042 struct dwarf2_cu *cu)
8044 bfd *abfd = cu->objfile->obfd;
8045 unsigned int abbrev_number;
8046 struct abbrev_info *abbrev;
8048 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
8050 if (abbrev_number == 0)
8053 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
8056 error (_("Dwarf Error: Could not find abbrev number %d in %s"
8057 " at offset 0x%x [in module %s]"),
8058 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
8059 to_underlying (cu->header.sect_off), bfd_get_filename (abfd));
8065 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
8066 Returns a pointer to the end of a series of DIEs, terminated by an empty
8067 DIE. Any children of the skipped DIEs will also be skipped. */
8069 static const gdb_byte *
8070 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
8072 struct dwarf2_cu *cu = reader->cu;
8073 struct abbrev_info *abbrev;
8074 unsigned int bytes_read;
8078 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
8080 return info_ptr + bytes_read;
8082 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
8086 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
8087 INFO_PTR should point just after the initial uleb128 of a DIE, and the
8088 abbrev corresponding to that skipped uleb128 should be passed in
8089 ABBREV. Returns a pointer to this DIE's sibling, skipping any
8092 static const gdb_byte *
8093 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
8094 struct abbrev_info *abbrev)
8096 unsigned int bytes_read;
8097 struct attribute attr;
8098 bfd *abfd = reader->abfd;
8099 struct dwarf2_cu *cu = reader->cu;
8100 const gdb_byte *buffer = reader->buffer;
8101 const gdb_byte *buffer_end = reader->buffer_end;
8102 unsigned int form, i;
8104 for (i = 0; i < abbrev->num_attrs; i++)
8106 /* The only abbrev we care about is DW_AT_sibling. */
8107 if (abbrev->attrs[i].name == DW_AT_sibling)
8109 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
8110 if (attr.form == DW_FORM_ref_addr)
8111 complaint (&symfile_complaints,
8112 _("ignoring absolute DW_AT_sibling"));
8115 sect_offset off = dwarf2_get_ref_die_offset (&attr);
8116 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
8118 if (sibling_ptr < info_ptr)
8119 complaint (&symfile_complaints,
8120 _("DW_AT_sibling points backwards"));
8121 else if (sibling_ptr > reader->buffer_end)
8122 dwarf2_section_buffer_overflow_complaint (reader->die_section);
8128 /* If it isn't DW_AT_sibling, skip this attribute. */
8129 form = abbrev->attrs[i].form;
8133 case DW_FORM_ref_addr:
8134 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
8135 and later it is offset sized. */
8136 if (cu->header.version == 2)
8137 info_ptr += cu->header.addr_size;
8139 info_ptr += cu->header.offset_size;
8141 case DW_FORM_GNU_ref_alt:
8142 info_ptr += cu->header.offset_size;
8145 info_ptr += cu->header.addr_size;
8152 case DW_FORM_flag_present:
8153 case DW_FORM_implicit_const:
8165 case DW_FORM_ref_sig8:
8168 case DW_FORM_data16:
8171 case DW_FORM_string:
8172 read_direct_string (abfd, info_ptr, &bytes_read);
8173 info_ptr += bytes_read;
8175 case DW_FORM_sec_offset:
8177 case DW_FORM_GNU_strp_alt:
8178 info_ptr += cu->header.offset_size;
8180 case DW_FORM_exprloc:
8182 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
8183 info_ptr += bytes_read;
8185 case DW_FORM_block1:
8186 info_ptr += 1 + read_1_byte (abfd, info_ptr);
8188 case DW_FORM_block2:
8189 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
8191 case DW_FORM_block4:
8192 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
8196 case DW_FORM_ref_udata:
8197 case DW_FORM_GNU_addr_index:
8198 case DW_FORM_GNU_str_index:
8199 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
8201 case DW_FORM_indirect:
8202 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
8203 info_ptr += bytes_read;
8204 /* We need to continue parsing from here, so just go back to
8206 goto skip_attribute;
8209 error (_("Dwarf Error: Cannot handle %s "
8210 "in DWARF reader [in module %s]"),
8211 dwarf_form_name (form),
8212 bfd_get_filename (abfd));
8216 if (abbrev->has_children)
8217 return skip_children (reader, info_ptr);
8222 /* Locate ORIG_PDI's sibling.
8223 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
8225 static const gdb_byte *
8226 locate_pdi_sibling (const struct die_reader_specs *reader,
8227 struct partial_die_info *orig_pdi,
8228 const gdb_byte *info_ptr)
8230 /* Do we know the sibling already? */
8232 if (orig_pdi->sibling)
8233 return orig_pdi->sibling;
8235 /* Are there any children to deal with? */
8237 if (!orig_pdi->has_children)
8240 /* Skip the children the long way. */
8242 return skip_children (reader, info_ptr);
8245 /* Expand this partial symbol table into a full symbol table. SELF is
8249 dwarf2_read_symtab (struct partial_symtab *self,
8250 struct objfile *objfile)
8254 warning (_("bug: psymtab for %s is already read in."),
8261 printf_filtered (_("Reading in symbols for %s..."),
8263 gdb_flush (gdb_stdout);
8266 /* Restore our global data. */
8268 = (struct dwarf2_per_objfile *) objfile_data (objfile,
8269 dwarf2_objfile_data_key);
8271 /* If this psymtab is constructed from a debug-only objfile, the
8272 has_section_at_zero flag will not necessarily be correct. We
8273 can get the correct value for this flag by looking at the data
8274 associated with the (presumably stripped) associated objfile. */
8275 if (objfile->separate_debug_objfile_backlink)
8277 struct dwarf2_per_objfile *dpo_backlink
8278 = ((struct dwarf2_per_objfile *)
8279 objfile_data (objfile->separate_debug_objfile_backlink,
8280 dwarf2_objfile_data_key));
8282 dwarf2_per_objfile->has_section_at_zero
8283 = dpo_backlink->has_section_at_zero;
8286 dwarf2_per_objfile->reading_partial_symbols = 0;
8288 psymtab_to_symtab_1 (self);
8290 /* Finish up the debug error message. */
8292 printf_filtered (_("done.\n"));
8295 process_cu_includes ();
8298 /* Reading in full CUs. */
8300 /* Add PER_CU to the queue. */
8303 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
8304 enum language pretend_language)
8306 struct dwarf2_queue_item *item;
8309 item = XNEW (struct dwarf2_queue_item);
8310 item->per_cu = per_cu;
8311 item->pretend_language = pretend_language;
8314 if (dwarf2_queue == NULL)
8315 dwarf2_queue = item;
8317 dwarf2_queue_tail->next = item;
8319 dwarf2_queue_tail = item;
8322 /* If PER_CU is not yet queued, add it to the queue.
8323 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
8325 The result is non-zero if PER_CU was queued, otherwise the result is zero
8326 meaning either PER_CU is already queued or it is already loaded.
8328 N.B. There is an invariant here that if a CU is queued then it is loaded.
8329 The caller is required to load PER_CU if we return non-zero. */
8332 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
8333 struct dwarf2_per_cu_data *per_cu,
8334 enum language pretend_language)
8336 /* We may arrive here during partial symbol reading, if we need full
8337 DIEs to process an unusual case (e.g. template arguments). Do
8338 not queue PER_CU, just tell our caller to load its DIEs. */
8339 if (dwarf2_per_objfile->reading_partial_symbols)
8341 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
8346 /* Mark the dependence relation so that we don't flush PER_CU
8348 if (dependent_cu != NULL)
8349 dwarf2_add_dependence (dependent_cu, per_cu);
8351 /* If it's already on the queue, we have nothing to do. */
8355 /* If the compilation unit is already loaded, just mark it as
8357 if (per_cu->cu != NULL)
8359 per_cu->cu->last_used = 0;
8363 /* Add it to the queue. */
8364 queue_comp_unit (per_cu, pretend_language);
8369 /* Process the queue. */
8372 process_queue (void)
8374 struct dwarf2_queue_item *item, *next_item;
8376 if (dwarf_read_debug)
8378 fprintf_unfiltered (gdb_stdlog,
8379 "Expanding one or more symtabs of objfile %s ...\n",
8380 objfile_name (dwarf2_per_objfile->objfile));
8383 /* The queue starts out with one item, but following a DIE reference
8384 may load a new CU, adding it to the end of the queue. */
8385 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
8387 if ((dwarf2_per_objfile->using_index
8388 ? !item->per_cu->v.quick->compunit_symtab
8389 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
8390 /* Skip dummy CUs. */
8391 && item->per_cu->cu != NULL)
8393 struct dwarf2_per_cu_data *per_cu = item->per_cu;
8394 unsigned int debug_print_threshold;
8397 if (per_cu->is_debug_types)
8399 struct signatured_type *sig_type =
8400 (struct signatured_type *) per_cu;
8402 sprintf (buf, "TU %s at offset 0x%x",
8403 hex_string (sig_type->signature),
8404 to_underlying (per_cu->sect_off));
8405 /* There can be 100s of TUs.
8406 Only print them in verbose mode. */
8407 debug_print_threshold = 2;
8411 sprintf (buf, "CU at offset 0x%x",
8412 to_underlying (per_cu->sect_off));
8413 debug_print_threshold = 1;
8416 if (dwarf_read_debug >= debug_print_threshold)
8417 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
8419 if (per_cu->is_debug_types)
8420 process_full_type_unit (per_cu, item->pretend_language);
8422 process_full_comp_unit (per_cu, item->pretend_language);
8424 if (dwarf_read_debug >= debug_print_threshold)
8425 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
8428 item->per_cu->queued = 0;
8429 next_item = item->next;
8433 dwarf2_queue_tail = NULL;
8435 if (dwarf_read_debug)
8437 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
8438 objfile_name (dwarf2_per_objfile->objfile));
8442 /* Free all allocated queue entries. This function only releases anything if
8443 an error was thrown; if the queue was processed then it would have been
8444 freed as we went along. */
8447 dwarf2_release_queue (void *dummy)
8449 struct dwarf2_queue_item *item, *last;
8451 item = dwarf2_queue;
8454 /* Anything still marked queued is likely to be in an
8455 inconsistent state, so discard it. */
8456 if (item->per_cu->queued)
8458 if (item->per_cu->cu != NULL)
8459 free_one_cached_comp_unit (item->per_cu);
8460 item->per_cu->queued = 0;
8468 dwarf2_queue = dwarf2_queue_tail = NULL;
8471 /* Read in full symbols for PST, and anything it depends on. */
8474 psymtab_to_symtab_1 (struct partial_symtab *pst)
8476 struct dwarf2_per_cu_data *per_cu;
8482 for (i = 0; i < pst->number_of_dependencies; i++)
8483 if (!pst->dependencies[i]->readin
8484 && pst->dependencies[i]->user == NULL)
8486 /* Inform about additional files that need to be read in. */
8489 /* FIXME: i18n: Need to make this a single string. */
8490 fputs_filtered (" ", gdb_stdout);
8492 fputs_filtered ("and ", gdb_stdout);
8494 printf_filtered ("%s...", pst->dependencies[i]->filename);
8495 wrap_here (""); /* Flush output. */
8496 gdb_flush (gdb_stdout);
8498 psymtab_to_symtab_1 (pst->dependencies[i]);
8501 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
8505 /* It's an include file, no symbols to read for it.
8506 Everything is in the parent symtab. */
8511 dw2_do_instantiate_symtab (per_cu);
8514 /* Trivial hash function for die_info: the hash value of a DIE
8515 is its offset in .debug_info for this objfile. */
8518 die_hash (const void *item)
8520 const struct die_info *die = (const struct die_info *) item;
8522 return to_underlying (die->sect_off);
8525 /* Trivial comparison function for die_info structures: two DIEs
8526 are equal if they have the same offset. */
8529 die_eq (const void *item_lhs, const void *item_rhs)
8531 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
8532 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
8534 return die_lhs->sect_off == die_rhs->sect_off;
8537 /* die_reader_func for load_full_comp_unit.
8538 This is identical to read_signatured_type_reader,
8539 but is kept separate for now. */
8542 load_full_comp_unit_reader (const struct die_reader_specs *reader,
8543 const gdb_byte *info_ptr,
8544 struct die_info *comp_unit_die,
8548 struct dwarf2_cu *cu = reader->cu;
8549 enum language *language_ptr = (enum language *) data;
8551 gdb_assert (cu->die_hash == NULL);
8553 htab_create_alloc_ex (cu->header.length / 12,
8557 &cu->comp_unit_obstack,
8558 hashtab_obstack_allocate,
8559 dummy_obstack_deallocate);
8562 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
8563 &info_ptr, comp_unit_die);
8564 cu->dies = comp_unit_die;
8565 /* comp_unit_die is not stored in die_hash, no need. */
8567 /* We try not to read any attributes in this function, because not
8568 all CUs needed for references have been loaded yet, and symbol
8569 table processing isn't initialized. But we have to set the CU language,
8570 or we won't be able to build types correctly.
8571 Similarly, if we do not read the producer, we can not apply
8572 producer-specific interpretation. */
8573 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
8576 /* Load the DIEs associated with PER_CU into memory. */
8579 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
8580 enum language pretend_language)
8582 gdb_assert (! this_cu->is_debug_types);
8584 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
8585 load_full_comp_unit_reader, &pretend_language);
8588 /* Add a DIE to the delayed physname list. */
8591 add_to_method_list (struct type *type, int fnfield_index, int index,
8592 const char *name, struct die_info *die,
8593 struct dwarf2_cu *cu)
8595 struct delayed_method_info mi;
8597 mi.fnfield_index = fnfield_index;
8601 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
8604 /* A cleanup for freeing the delayed method list. */
8607 free_delayed_list (void *ptr)
8609 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
8610 if (cu->method_list != NULL)
8612 VEC_free (delayed_method_info, cu->method_list);
8613 cu->method_list = NULL;
8617 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
8618 "const" / "volatile". If so, decrements LEN by the length of the
8619 modifier and return true. Otherwise return false. */
8623 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
8625 size_t mod_len = sizeof (mod) - 1;
8626 if (len > mod_len && startswith (physname + (len - mod_len), mod))
8634 /* Compute the physnames of any methods on the CU's method list.
8636 The computation of method physnames is delayed in order to avoid the
8637 (bad) condition that one of the method's formal parameters is of an as yet
8641 compute_delayed_physnames (struct dwarf2_cu *cu)
8644 struct delayed_method_info *mi;
8646 /* Only C++ delays computing physnames. */
8647 if (VEC_empty (delayed_method_info, cu->method_list))
8649 gdb_assert (cu->language == language_cplus);
8651 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
8653 const char *physname;
8654 struct fn_fieldlist *fn_flp
8655 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
8656 physname = dwarf2_physname (mi->name, mi->die, cu);
8657 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi->index)
8658 = physname ? physname : "";
8660 /* Since there's no tag to indicate whether a method is a
8661 const/volatile overload, extract that information out of the
8663 if (physname != NULL)
8665 size_t len = strlen (physname);
8669 if (physname[len] == ')') /* shortcut */
8671 else if (check_modifier (physname, len, " const"))
8672 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi->index) = 1;
8673 else if (check_modifier (physname, len, " volatile"))
8674 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi->index) = 1;
8682 /* Go objects should be embedded in a DW_TAG_module DIE,
8683 and it's not clear if/how imported objects will appear.
8684 To keep Go support simple until that's worked out,
8685 go back through what we've read and create something usable.
8686 We could do this while processing each DIE, and feels kinda cleaner,
8687 but that way is more invasive.
8688 This is to, for example, allow the user to type "p var" or "b main"
8689 without having to specify the package name, and allow lookups
8690 of module.object to work in contexts that use the expression
8694 fixup_go_packaging (struct dwarf2_cu *cu)
8696 char *package_name = NULL;
8697 struct pending *list;
8700 for (list = global_symbols; list != NULL; list = list->next)
8702 for (i = 0; i < list->nsyms; ++i)
8704 struct symbol *sym = list->symbol[i];
8706 if (SYMBOL_LANGUAGE (sym) == language_go
8707 && SYMBOL_CLASS (sym) == LOC_BLOCK)
8709 char *this_package_name = go_symbol_package_name (sym);
8711 if (this_package_name == NULL)
8713 if (package_name == NULL)
8714 package_name = this_package_name;
8717 if (strcmp (package_name, this_package_name) != 0)
8718 complaint (&symfile_complaints,
8719 _("Symtab %s has objects from two different Go packages: %s and %s"),
8720 (symbol_symtab (sym) != NULL
8721 ? symtab_to_filename_for_display
8722 (symbol_symtab (sym))
8723 : objfile_name (cu->objfile)),
8724 this_package_name, package_name);
8725 xfree (this_package_name);
8731 if (package_name != NULL)
8733 struct objfile *objfile = cu->objfile;
8734 const char *saved_package_name
8735 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
8737 strlen (package_name));
8738 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
8739 saved_package_name);
8742 TYPE_TAG_NAME (type) = TYPE_NAME (type);
8744 sym = allocate_symbol (objfile);
8745 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
8746 SYMBOL_SET_NAMES (sym, saved_package_name,
8747 strlen (saved_package_name), 0, objfile);
8748 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
8749 e.g., "main" finds the "main" module and not C's main(). */
8750 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
8751 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
8752 SYMBOL_TYPE (sym) = type;
8754 add_symbol_to_list (sym, &global_symbols);
8756 xfree (package_name);
8760 /* Return the symtab for PER_CU. This works properly regardless of
8761 whether we're using the index or psymtabs. */
8763 static struct compunit_symtab *
8764 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
8766 return (dwarf2_per_objfile->using_index
8767 ? per_cu->v.quick->compunit_symtab
8768 : per_cu->v.psymtab->compunit_symtab);
8771 /* A helper function for computing the list of all symbol tables
8772 included by PER_CU. */
8775 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
8776 htab_t all_children, htab_t all_type_symtabs,
8777 struct dwarf2_per_cu_data *per_cu,
8778 struct compunit_symtab *immediate_parent)
8782 struct compunit_symtab *cust;
8783 struct dwarf2_per_cu_data *iter;
8785 slot = htab_find_slot (all_children, per_cu, INSERT);
8788 /* This inclusion and its children have been processed. */
8793 /* Only add a CU if it has a symbol table. */
8794 cust = get_compunit_symtab (per_cu);
8797 /* If this is a type unit only add its symbol table if we haven't
8798 seen it yet (type unit per_cu's can share symtabs). */
8799 if (per_cu->is_debug_types)
8801 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
8805 VEC_safe_push (compunit_symtab_ptr, *result, cust);
8806 if (cust->user == NULL)
8807 cust->user = immediate_parent;
8812 VEC_safe_push (compunit_symtab_ptr, *result, cust);
8813 if (cust->user == NULL)
8814 cust->user = immediate_parent;
8819 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
8822 recursively_compute_inclusions (result, all_children,
8823 all_type_symtabs, iter, cust);
8827 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
8831 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
8833 gdb_assert (! per_cu->is_debug_types);
8835 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
8838 struct dwarf2_per_cu_data *per_cu_iter;
8839 struct compunit_symtab *compunit_symtab_iter;
8840 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
8841 htab_t all_children, all_type_symtabs;
8842 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
8844 /* If we don't have a symtab, we can just skip this case. */
8848 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
8849 NULL, xcalloc, xfree);
8850 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
8851 NULL, xcalloc, xfree);
8854 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
8858 recursively_compute_inclusions (&result_symtabs, all_children,
8859 all_type_symtabs, per_cu_iter,
8863 /* Now we have a transitive closure of all the included symtabs. */
8864 len = VEC_length (compunit_symtab_ptr, result_symtabs);
8866 = XOBNEWVEC (&dwarf2_per_objfile->objfile->objfile_obstack,
8867 struct compunit_symtab *, len + 1);
8869 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
8870 compunit_symtab_iter);
8872 cust->includes[ix] = compunit_symtab_iter;
8873 cust->includes[len] = NULL;
8875 VEC_free (compunit_symtab_ptr, result_symtabs);
8876 htab_delete (all_children);
8877 htab_delete (all_type_symtabs);
8881 /* Compute the 'includes' field for the symtabs of all the CUs we just
8885 process_cu_includes (void)
8888 struct dwarf2_per_cu_data *iter;
8891 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
8895 if (! iter->is_debug_types)
8896 compute_compunit_symtab_includes (iter);
8899 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
8902 /* Generate full symbol information for PER_CU, whose DIEs have
8903 already been loaded into memory. */
8906 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
8907 enum language pretend_language)
8909 struct dwarf2_cu *cu = per_cu->cu;
8910 struct objfile *objfile = per_cu->objfile;
8911 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8912 CORE_ADDR lowpc, highpc;
8913 struct compunit_symtab *cust;
8914 struct cleanup *delayed_list_cleanup;
8916 struct block *static_block;
8919 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8922 scoped_free_pendings free_pending;
8923 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
8925 cu->list_in_scope = &file_symbols;
8927 cu->language = pretend_language;
8928 cu->language_defn = language_def (cu->language);
8930 /* Do line number decoding in read_file_scope () */
8931 process_die (cu->dies, cu);
8933 /* For now fudge the Go package. */
8934 if (cu->language == language_go)
8935 fixup_go_packaging (cu);
8937 /* Now that we have processed all the DIEs in the CU, all the types
8938 should be complete, and it should now be safe to compute all of the
8940 compute_delayed_physnames (cu);
8941 do_cleanups (delayed_list_cleanup);
8943 /* Some compilers don't define a DW_AT_high_pc attribute for the
8944 compilation unit. If the DW_AT_high_pc is missing, synthesize
8945 it, by scanning the DIE's below the compilation unit. */
8946 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
8948 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
8949 static_block = end_symtab_get_static_block (addr, 0, 1);
8951 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
8952 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
8953 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
8954 addrmap to help ensure it has an accurate map of pc values belonging to
8956 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
8958 cust = end_symtab_from_static_block (static_block,
8959 SECT_OFF_TEXT (objfile), 0);
8963 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
8965 /* Set symtab language to language from DW_AT_language. If the
8966 compilation is from a C file generated by language preprocessors, do
8967 not set the language if it was already deduced by start_subfile. */
8968 if (!(cu->language == language_c
8969 && COMPUNIT_FILETABS (cust)->language != language_unknown))
8970 COMPUNIT_FILETABS (cust)->language = cu->language;
8972 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
8973 produce DW_AT_location with location lists but it can be possibly
8974 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
8975 there were bugs in prologue debug info, fixed later in GCC-4.5
8976 by "unwind info for epilogues" patch (which is not directly related).
8978 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
8979 needed, it would be wrong due to missing DW_AT_producer there.
8981 Still one can confuse GDB by using non-standard GCC compilation
8982 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
8984 if (cu->has_loclist && gcc_4_minor >= 5)
8985 cust->locations_valid = 1;
8987 if (gcc_4_minor >= 5)
8988 cust->epilogue_unwind_valid = 1;
8990 cust->call_site_htab = cu->call_site_htab;
8993 if (dwarf2_per_objfile->using_index)
8994 per_cu->v.quick->compunit_symtab = cust;
8997 struct partial_symtab *pst = per_cu->v.psymtab;
8998 pst->compunit_symtab = cust;
9002 /* Push it for inclusion processing later. */
9003 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
9006 /* Generate full symbol information for type unit PER_CU, whose DIEs have
9007 already been loaded into memory. */
9010 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
9011 enum language pretend_language)
9013 struct dwarf2_cu *cu = per_cu->cu;
9014 struct objfile *objfile = per_cu->objfile;
9015 struct compunit_symtab *cust;
9016 struct cleanup *delayed_list_cleanup;
9017 struct signatured_type *sig_type;
9019 gdb_assert (per_cu->is_debug_types);
9020 sig_type = (struct signatured_type *) per_cu;
9023 scoped_free_pendings free_pending;
9024 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
9026 cu->list_in_scope = &file_symbols;
9028 cu->language = pretend_language;
9029 cu->language_defn = language_def (cu->language);
9031 /* The symbol tables are set up in read_type_unit_scope. */
9032 process_die (cu->dies, cu);
9034 /* For now fudge the Go package. */
9035 if (cu->language == language_go)
9036 fixup_go_packaging (cu);
9038 /* Now that we have processed all the DIEs in the CU, all the types
9039 should be complete, and it should now be safe to compute all of the
9041 compute_delayed_physnames (cu);
9042 do_cleanups (delayed_list_cleanup);
9044 /* TUs share symbol tables.
9045 If this is the first TU to use this symtab, complete the construction
9046 of it with end_expandable_symtab. Otherwise, complete the addition of
9047 this TU's symbols to the existing symtab. */
9048 if (sig_type->type_unit_group->compunit_symtab == NULL)
9050 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
9051 sig_type->type_unit_group->compunit_symtab = cust;
9055 /* Set symtab language to language from DW_AT_language. If the
9056 compilation is from a C file generated by language preprocessors,
9057 do not set the language if it was already deduced by
9059 if (!(cu->language == language_c
9060 && COMPUNIT_FILETABS (cust)->language != language_c))
9061 COMPUNIT_FILETABS (cust)->language = cu->language;
9066 augment_type_symtab ();
9067 cust = sig_type->type_unit_group->compunit_symtab;
9070 if (dwarf2_per_objfile->using_index)
9071 per_cu->v.quick->compunit_symtab = cust;
9074 struct partial_symtab *pst = per_cu->v.psymtab;
9075 pst->compunit_symtab = cust;
9080 /* Process an imported unit DIE. */
9083 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
9085 struct attribute *attr;
9087 /* For now we don't handle imported units in type units. */
9088 if (cu->per_cu->is_debug_types)
9090 error (_("Dwarf Error: DW_TAG_imported_unit is not"
9091 " supported in type units [in module %s]"),
9092 objfile_name (cu->objfile));
9095 attr = dwarf2_attr (die, DW_AT_import, cu);
9098 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
9099 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
9100 dwarf2_per_cu_data *per_cu
9101 = dwarf2_find_containing_comp_unit (sect_off, is_dwz, cu->objfile);
9103 /* If necessary, add it to the queue and load its DIEs. */
9104 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
9105 load_full_comp_unit (per_cu, cu->language);
9107 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
9112 /* RAII object that represents a process_die scope: i.e.,
9113 starts/finishes processing a DIE. */
9114 class process_die_scope
9117 process_die_scope (die_info *die, dwarf2_cu *cu)
9118 : m_die (die), m_cu (cu)
9120 /* We should only be processing DIEs not already in process. */
9121 gdb_assert (!m_die->in_process);
9122 m_die->in_process = true;
9125 ~process_die_scope ()
9127 m_die->in_process = false;
9129 /* If we're done processing the DIE for the CU that owns the line
9130 header, we don't need the line header anymore. */
9131 if (m_cu->line_header_die_owner == m_die)
9133 delete m_cu->line_header;
9134 m_cu->line_header = NULL;
9135 m_cu->line_header_die_owner = NULL;
9144 /* Process a die and its children. */
9147 process_die (struct die_info *die, struct dwarf2_cu *cu)
9149 process_die_scope scope (die, cu);
9153 case DW_TAG_padding:
9155 case DW_TAG_compile_unit:
9156 case DW_TAG_partial_unit:
9157 read_file_scope (die, cu);
9159 case DW_TAG_type_unit:
9160 read_type_unit_scope (die, cu);
9162 case DW_TAG_subprogram:
9163 case DW_TAG_inlined_subroutine:
9164 read_func_scope (die, cu);
9166 case DW_TAG_lexical_block:
9167 case DW_TAG_try_block:
9168 case DW_TAG_catch_block:
9169 read_lexical_block_scope (die, cu);
9171 case DW_TAG_call_site:
9172 case DW_TAG_GNU_call_site:
9173 read_call_site_scope (die, cu);
9175 case DW_TAG_class_type:
9176 case DW_TAG_interface_type:
9177 case DW_TAG_structure_type:
9178 case DW_TAG_union_type:
9179 process_structure_scope (die, cu);
9181 case DW_TAG_enumeration_type:
9182 process_enumeration_scope (die, cu);
9185 /* These dies have a type, but processing them does not create
9186 a symbol or recurse to process the children. Therefore we can
9187 read them on-demand through read_type_die. */
9188 case DW_TAG_subroutine_type:
9189 case DW_TAG_set_type:
9190 case DW_TAG_array_type:
9191 case DW_TAG_pointer_type:
9192 case DW_TAG_ptr_to_member_type:
9193 case DW_TAG_reference_type:
9194 case DW_TAG_rvalue_reference_type:
9195 case DW_TAG_string_type:
9198 case DW_TAG_base_type:
9199 case DW_TAG_subrange_type:
9200 case DW_TAG_typedef:
9201 /* Add a typedef symbol for the type definition, if it has a
9203 new_symbol (die, read_type_die (die, cu), cu);
9205 case DW_TAG_common_block:
9206 read_common_block (die, cu);
9208 case DW_TAG_common_inclusion:
9210 case DW_TAG_namespace:
9211 cu->processing_has_namespace_info = 1;
9212 read_namespace (die, cu);
9215 cu->processing_has_namespace_info = 1;
9216 read_module (die, cu);
9218 case DW_TAG_imported_declaration:
9219 cu->processing_has_namespace_info = 1;
9220 if (read_namespace_alias (die, cu))
9222 /* The declaration is not a global namespace alias: fall through. */
9223 case DW_TAG_imported_module:
9224 cu->processing_has_namespace_info = 1;
9225 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
9226 || cu->language != language_fortran))
9227 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
9228 dwarf_tag_name (die->tag));
9229 read_import_statement (die, cu);
9232 case DW_TAG_imported_unit:
9233 process_imported_unit_die (die, cu);
9236 case DW_TAG_variable:
9237 read_variable (die, cu);
9241 new_symbol (die, NULL, cu);
9246 /* DWARF name computation. */
9248 /* A helper function for dwarf2_compute_name which determines whether DIE
9249 needs to have the name of the scope prepended to the name listed in the
9253 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
9255 struct attribute *attr;
9259 case DW_TAG_namespace:
9260 case DW_TAG_typedef:
9261 case DW_TAG_class_type:
9262 case DW_TAG_interface_type:
9263 case DW_TAG_structure_type:
9264 case DW_TAG_union_type:
9265 case DW_TAG_enumeration_type:
9266 case DW_TAG_enumerator:
9267 case DW_TAG_subprogram:
9268 case DW_TAG_inlined_subroutine:
9270 case DW_TAG_imported_declaration:
9273 case DW_TAG_variable:
9274 case DW_TAG_constant:
9275 /* We only need to prefix "globally" visible variables. These include
9276 any variable marked with DW_AT_external or any variable that
9277 lives in a namespace. [Variables in anonymous namespaces
9278 require prefixing, but they are not DW_AT_external.] */
9280 if (dwarf2_attr (die, DW_AT_specification, cu))
9282 struct dwarf2_cu *spec_cu = cu;
9284 return die_needs_namespace (die_specification (die, &spec_cu),
9288 attr = dwarf2_attr (die, DW_AT_external, cu);
9289 if (attr == NULL && die->parent->tag != DW_TAG_namespace
9290 && die->parent->tag != DW_TAG_module)
9292 /* A variable in a lexical block of some kind does not need a
9293 namespace, even though in C++ such variables may be external
9294 and have a mangled name. */
9295 if (die->parent->tag == DW_TAG_lexical_block
9296 || die->parent->tag == DW_TAG_try_block
9297 || die->parent->tag == DW_TAG_catch_block
9298 || die->parent->tag == DW_TAG_subprogram)
9307 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
9308 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
9309 defined for the given DIE. */
9311 static struct attribute *
9312 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
9314 struct attribute *attr;
9316 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
9318 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
9323 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
9324 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
9325 defined for the given DIE. */
9328 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
9330 const char *linkage_name;
9332 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
9333 if (linkage_name == NULL)
9334 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
9336 return linkage_name;
9339 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
9340 compute the physname for the object, which include a method's:
9341 - formal parameters (C++),
9342 - receiver type (Go),
9344 The term "physname" is a bit confusing.
9345 For C++, for example, it is the demangled name.
9346 For Go, for example, it's the mangled name.
9348 For Ada, return the DIE's linkage name rather than the fully qualified
9349 name. PHYSNAME is ignored..
9351 The result is allocated on the objfile_obstack and canonicalized. */
9354 dwarf2_compute_name (const char *name,
9355 struct die_info *die, struct dwarf2_cu *cu,
9358 struct objfile *objfile = cu->objfile;
9361 name = dwarf2_name (die, cu);
9363 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
9364 but otherwise compute it by typename_concat inside GDB.
9365 FIXME: Actually this is not really true, or at least not always true.
9366 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
9367 Fortran names because there is no mangling standard. So new_symbol_full
9368 will set the demangled name to the result of dwarf2_full_name, and it is
9369 the demangled name that GDB uses if it exists. */
9370 if (cu->language == language_ada
9371 || (cu->language == language_fortran && physname))
9373 /* For Ada unit, we prefer the linkage name over the name, as
9374 the former contains the exported name, which the user expects
9375 to be able to reference. Ideally, we want the user to be able
9376 to reference this entity using either natural or linkage name,
9377 but we haven't started looking at this enhancement yet. */
9378 const char *linkage_name = dw2_linkage_name (die, cu);
9380 if (linkage_name != NULL)
9381 return linkage_name;
9384 /* These are the only languages we know how to qualify names in. */
9386 && (cu->language == language_cplus
9387 || cu->language == language_fortran || cu->language == language_d
9388 || cu->language == language_rust))
9390 if (die_needs_namespace (die, cu))
9394 const char *canonical_name = NULL;
9398 prefix = determine_prefix (die, cu);
9399 if (*prefix != '\0')
9401 char *prefixed_name = typename_concat (NULL, prefix, name,
9404 buf.puts (prefixed_name);
9405 xfree (prefixed_name);
9410 /* Template parameters may be specified in the DIE's DW_AT_name, or
9411 as children with DW_TAG_template_type_param or
9412 DW_TAG_value_type_param. If the latter, add them to the name
9413 here. If the name already has template parameters, then
9414 skip this step; some versions of GCC emit both, and
9415 it is more efficient to use the pre-computed name.
9417 Something to keep in mind about this process: it is very
9418 unlikely, or in some cases downright impossible, to produce
9419 something that will match the mangled name of a function.
9420 If the definition of the function has the same debug info,
9421 we should be able to match up with it anyway. But fallbacks
9422 using the minimal symbol, for instance to find a method
9423 implemented in a stripped copy of libstdc++, will not work.
9424 If we do not have debug info for the definition, we will have to
9425 match them up some other way.
9427 When we do name matching there is a related problem with function
9428 templates; two instantiated function templates are allowed to
9429 differ only by their return types, which we do not add here. */
9431 if (cu->language == language_cplus && strchr (name, '<') == NULL)
9433 struct attribute *attr;
9434 struct die_info *child;
9437 die->building_fullname = 1;
9439 for (child = die->child; child != NULL; child = child->sibling)
9443 const gdb_byte *bytes;
9444 struct dwarf2_locexpr_baton *baton;
9447 if (child->tag != DW_TAG_template_type_param
9448 && child->tag != DW_TAG_template_value_param)
9459 attr = dwarf2_attr (child, DW_AT_type, cu);
9462 complaint (&symfile_complaints,
9463 _("template parameter missing DW_AT_type"));
9464 buf.puts ("UNKNOWN_TYPE");
9467 type = die_type (child, cu);
9469 if (child->tag == DW_TAG_template_type_param)
9471 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
9475 attr = dwarf2_attr (child, DW_AT_const_value, cu);
9478 complaint (&symfile_complaints,
9479 _("template parameter missing "
9480 "DW_AT_const_value"));
9481 buf.puts ("UNKNOWN_VALUE");
9485 dwarf2_const_value_attr (attr, type, name,
9486 &cu->comp_unit_obstack, cu,
9487 &value, &bytes, &baton);
9489 if (TYPE_NOSIGN (type))
9490 /* GDB prints characters as NUMBER 'CHAR'. If that's
9491 changed, this can use value_print instead. */
9492 c_printchar (value, type, &buf);
9495 struct value_print_options opts;
9498 v = dwarf2_evaluate_loc_desc (type, NULL,
9502 else if (bytes != NULL)
9504 v = allocate_value (type);
9505 memcpy (value_contents_writeable (v), bytes,
9506 TYPE_LENGTH (type));
9509 v = value_from_longest (type, value);
9511 /* Specify decimal so that we do not depend on
9513 get_formatted_print_options (&opts, 'd');
9515 value_print (v, &buf, &opts);
9521 die->building_fullname = 0;
9525 /* Close the argument list, with a space if necessary
9526 (nested templates). */
9527 if (!buf.empty () && buf.string ().back () == '>')
9534 /* For C++ methods, append formal parameter type
9535 information, if PHYSNAME. */
9537 if (physname && die->tag == DW_TAG_subprogram
9538 && cu->language == language_cplus)
9540 struct type *type = read_type_die (die, cu);
9542 c_type_print_args (type, &buf, 1, cu->language,
9543 &type_print_raw_options);
9545 if (cu->language == language_cplus)
9547 /* Assume that an artificial first parameter is
9548 "this", but do not crash if it is not. RealView
9549 marks unnamed (and thus unused) parameters as
9550 artificial; there is no way to differentiate
9552 if (TYPE_NFIELDS (type) > 0
9553 && TYPE_FIELD_ARTIFICIAL (type, 0)
9554 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
9555 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
9557 buf.puts (" const");
9561 const std::string &intermediate_name = buf.string ();
9563 if (cu->language == language_cplus)
9565 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
9566 &objfile->per_bfd->storage_obstack);
9568 /* If we only computed INTERMEDIATE_NAME, or if
9569 INTERMEDIATE_NAME is already canonical, then we need to
9570 copy it to the appropriate obstack. */
9571 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
9572 name = ((const char *)
9573 obstack_copy0 (&objfile->per_bfd->storage_obstack,
9574 intermediate_name.c_str (),
9575 intermediate_name.length ()));
9577 name = canonical_name;
9584 /* Return the fully qualified name of DIE, based on its DW_AT_name.
9585 If scope qualifiers are appropriate they will be added. The result
9586 will be allocated on the storage_obstack, or NULL if the DIE does
9587 not have a name. NAME may either be from a previous call to
9588 dwarf2_name or NULL.
9590 The output string will be canonicalized (if C++). */
9593 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
9595 return dwarf2_compute_name (name, die, cu, 0);
9598 /* Construct a physname for the given DIE in CU. NAME may either be
9599 from a previous call to dwarf2_name or NULL. The result will be
9600 allocated on the objfile_objstack or NULL if the DIE does not have a
9603 The output string will be canonicalized (if C++). */
9606 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
9608 struct objfile *objfile = cu->objfile;
9609 const char *retval, *mangled = NULL, *canon = NULL;
9612 /* In this case dwarf2_compute_name is just a shortcut not building anything
9614 if (!die_needs_namespace (die, cu))
9615 return dwarf2_compute_name (name, die, cu, 1);
9617 mangled = dw2_linkage_name (die, cu);
9619 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
9620 See https://github.com/rust-lang/rust/issues/32925. */
9621 if (cu->language == language_rust && mangled != NULL
9622 && strchr (mangled, '{') != NULL)
9625 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
9627 gdb::unique_xmalloc_ptr<char> demangled;
9628 if (mangled != NULL)
9630 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
9631 type. It is easier for GDB users to search for such functions as
9632 `name(params)' than `long name(params)'. In such case the minimal
9633 symbol names do not match the full symbol names but for template
9634 functions there is never a need to look up their definition from their
9635 declaration so the only disadvantage remains the minimal symbol
9636 variant `long name(params)' does not have the proper inferior type.
9639 if (cu->language == language_go)
9641 /* This is a lie, but we already lie to the caller new_symbol_full.
9642 new_symbol_full assumes we return the mangled name.
9643 This just undoes that lie until things are cleaned up. */
9647 demangled.reset (gdb_demangle (mangled,
9648 (DMGL_PARAMS | DMGL_ANSI
9652 canon = demangled.get ();
9660 if (canon == NULL || check_physname)
9662 const char *physname = dwarf2_compute_name (name, die, cu, 1);
9664 if (canon != NULL && strcmp (physname, canon) != 0)
9666 /* It may not mean a bug in GDB. The compiler could also
9667 compute DW_AT_linkage_name incorrectly. But in such case
9668 GDB would need to be bug-to-bug compatible. */
9670 complaint (&symfile_complaints,
9671 _("Computed physname <%s> does not match demangled <%s> "
9672 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
9673 physname, canon, mangled, to_underlying (die->sect_off),
9674 objfile_name (objfile));
9676 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
9677 is available here - over computed PHYSNAME. It is safer
9678 against both buggy GDB and buggy compilers. */
9692 retval = ((const char *)
9693 obstack_copy0 (&objfile->per_bfd->storage_obstack,
9694 retval, strlen (retval)));
9699 /* Inspect DIE in CU for a namespace alias. If one exists, record
9700 a new symbol for it.
9702 Returns 1 if a namespace alias was recorded, 0 otherwise. */
9705 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
9707 struct attribute *attr;
9709 /* If the die does not have a name, this is not a namespace
9711 attr = dwarf2_attr (die, DW_AT_name, cu);
9715 struct die_info *d = die;
9716 struct dwarf2_cu *imported_cu = cu;
9718 /* If the compiler has nested DW_AT_imported_declaration DIEs,
9719 keep inspecting DIEs until we hit the underlying import. */
9720 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
9721 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
9723 attr = dwarf2_attr (d, DW_AT_import, cu);
9727 d = follow_die_ref (d, attr, &imported_cu);
9728 if (d->tag != DW_TAG_imported_declaration)
9732 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
9734 complaint (&symfile_complaints,
9735 _("DIE at 0x%x has too many recursively imported "
9736 "declarations"), to_underlying (d->sect_off));
9743 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
9745 type = get_die_type_at_offset (sect_off, cu->per_cu);
9746 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
9748 /* This declaration is a global namespace alias. Add
9749 a symbol for it whose type is the aliased namespace. */
9750 new_symbol (die, type, cu);
9759 /* Return the using directives repository (global or local?) to use in the
9760 current context for LANGUAGE.
9762 For Ada, imported declarations can materialize renamings, which *may* be
9763 global. However it is impossible (for now?) in DWARF to distinguish
9764 "external" imported declarations and "static" ones. As all imported
9765 declarations seem to be static in all other languages, make them all CU-wide
9766 global only in Ada. */
9768 static struct using_direct **
9769 using_directives (enum language language)
9771 if (language == language_ada && context_stack_depth == 0)
9772 return &global_using_directives;
9774 return &local_using_directives;
9777 /* Read the import statement specified by the given die and record it. */
9780 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
9782 struct objfile *objfile = cu->objfile;
9783 struct attribute *import_attr;
9784 struct die_info *imported_die, *child_die;
9785 struct dwarf2_cu *imported_cu;
9786 const char *imported_name;
9787 const char *imported_name_prefix;
9788 const char *canonical_name;
9789 const char *import_alias;
9790 const char *imported_declaration = NULL;
9791 const char *import_prefix;
9792 std::vector<const char *> excludes;
9794 import_attr = dwarf2_attr (die, DW_AT_import, cu);
9795 if (import_attr == NULL)
9797 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9798 dwarf_tag_name (die->tag));
9803 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
9804 imported_name = dwarf2_name (imported_die, imported_cu);
9805 if (imported_name == NULL)
9807 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
9809 The import in the following code:
9823 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
9824 <52> DW_AT_decl_file : 1
9825 <53> DW_AT_decl_line : 6
9826 <54> DW_AT_import : <0x75>
9827 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
9829 <5b> DW_AT_decl_file : 1
9830 <5c> DW_AT_decl_line : 2
9831 <5d> DW_AT_type : <0x6e>
9833 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
9834 <76> DW_AT_byte_size : 4
9835 <77> DW_AT_encoding : 5 (signed)
9837 imports the wrong die ( 0x75 instead of 0x58 ).
9838 This case will be ignored until the gcc bug is fixed. */
9842 /* Figure out the local name after import. */
9843 import_alias = dwarf2_name (die, cu);
9845 /* Figure out where the statement is being imported to. */
9846 import_prefix = determine_prefix (die, cu);
9848 /* Figure out what the scope of the imported die is and prepend it
9849 to the name of the imported die. */
9850 imported_name_prefix = determine_prefix (imported_die, imported_cu);
9852 if (imported_die->tag != DW_TAG_namespace
9853 && imported_die->tag != DW_TAG_module)
9855 imported_declaration = imported_name;
9856 canonical_name = imported_name_prefix;
9858 else if (strlen (imported_name_prefix) > 0)
9859 canonical_name = obconcat (&objfile->objfile_obstack,
9860 imported_name_prefix,
9861 (cu->language == language_d ? "." : "::"),
9862 imported_name, (char *) NULL);
9864 canonical_name = imported_name;
9866 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
9867 for (child_die = die->child; child_die && child_die->tag;
9868 child_die = sibling_die (child_die))
9870 /* DWARF-4: A Fortran use statement with a “rename list” may be
9871 represented by an imported module entry with an import attribute
9872 referring to the module and owned entries corresponding to those
9873 entities that are renamed as part of being imported. */
9875 if (child_die->tag != DW_TAG_imported_declaration)
9877 complaint (&symfile_complaints,
9878 _("child DW_TAG_imported_declaration expected "
9879 "- DIE at 0x%x [in module %s]"),
9880 to_underlying (child_die->sect_off), objfile_name (objfile));
9884 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
9885 if (import_attr == NULL)
9887 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
9888 dwarf_tag_name (child_die->tag));
9893 imported_die = follow_die_ref_or_sig (child_die, import_attr,
9895 imported_name = dwarf2_name (imported_die, imported_cu);
9896 if (imported_name == NULL)
9898 complaint (&symfile_complaints,
9899 _("child DW_TAG_imported_declaration has unknown "
9900 "imported name - DIE at 0x%x [in module %s]"),
9901 to_underlying (child_die->sect_off), objfile_name (objfile));
9905 excludes.push_back (imported_name);
9907 process_die (child_die, cu);
9910 add_using_directive (using_directives (cu->language),
9914 imported_declaration,
9917 &objfile->objfile_obstack);
9920 /* ICC<14 does not output the required DW_AT_declaration on incomplete
9921 types, but gives them a size of zero. Starting with version 14,
9922 ICC is compatible with GCC. */
9925 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
9927 if (!cu->checked_producer)
9928 check_producer (cu);
9930 return cu->producer_is_icc_lt_14;
9933 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
9934 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
9935 this, it was first present in GCC release 4.3.0. */
9938 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
9940 if (!cu->checked_producer)
9941 check_producer (cu);
9943 return cu->producer_is_gcc_lt_4_3;
9946 static file_and_directory
9947 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
9949 file_and_directory res;
9951 /* Find the filename. Do not use dwarf2_name here, since the filename
9952 is not a source language identifier. */
9953 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
9954 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
9956 if (res.comp_dir == NULL
9957 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
9958 && IS_ABSOLUTE_PATH (res.name))
9960 res.comp_dir_storage = ldirname (res.name);
9961 if (!res.comp_dir_storage.empty ())
9962 res.comp_dir = res.comp_dir_storage.c_str ();
9964 if (res.comp_dir != NULL)
9966 /* Irix 6.2 native cc prepends <machine>.: to the compilation
9967 directory, get rid of it. */
9968 const char *cp = strchr (res.comp_dir, ':');
9970 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
9971 res.comp_dir = cp + 1;
9974 if (res.name == NULL)
9975 res.name = "<unknown>";
9980 /* Handle DW_AT_stmt_list for a compilation unit.
9981 DIE is the DW_TAG_compile_unit die for CU.
9982 COMP_DIR is the compilation directory. LOWPC is passed to
9983 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
9986 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
9987 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
9989 struct objfile *objfile = dwarf2_per_objfile->objfile;
9990 struct attribute *attr;
9991 struct line_header line_header_local;
9992 hashval_t line_header_local_hash;
9997 gdb_assert (! cu->per_cu->is_debug_types);
9999 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
10003 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
10005 /* The line header hash table is only created if needed (it exists to
10006 prevent redundant reading of the line table for partial_units).
10007 If we're given a partial_unit, we'll need it. If we're given a
10008 compile_unit, then use the line header hash table if it's already
10009 created, but don't create one just yet. */
10011 if (dwarf2_per_objfile->line_header_hash == NULL
10012 && die->tag == DW_TAG_partial_unit)
10014 dwarf2_per_objfile->line_header_hash
10015 = htab_create_alloc_ex (127, line_header_hash_voidp,
10016 line_header_eq_voidp,
10017 free_line_header_voidp,
10018 &objfile->objfile_obstack,
10019 hashtab_obstack_allocate,
10020 dummy_obstack_deallocate);
10023 line_header_local.sect_off = line_offset;
10024 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
10025 line_header_local_hash = line_header_hash (&line_header_local);
10026 if (dwarf2_per_objfile->line_header_hash != NULL)
10028 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
10029 &line_header_local,
10030 line_header_local_hash, NO_INSERT);
10032 /* For DW_TAG_compile_unit we need info like symtab::linetable which
10033 is not present in *SLOT (since if there is something in *SLOT then
10034 it will be for a partial_unit). */
10035 if (die->tag == DW_TAG_partial_unit && slot != NULL)
10037 gdb_assert (*slot != NULL);
10038 cu->line_header = (struct line_header *) *slot;
10043 /* dwarf_decode_line_header does not yet provide sufficient information.
10044 We always have to call also dwarf_decode_lines for it. */
10045 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
10049 cu->line_header = lh.release ();
10050 cu->line_header_die_owner = die;
10052 if (dwarf2_per_objfile->line_header_hash == NULL)
10056 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
10057 &line_header_local,
10058 line_header_local_hash, INSERT);
10059 gdb_assert (slot != NULL);
10061 if (slot != NULL && *slot == NULL)
10063 /* This newly decoded line number information unit will be owned
10064 by line_header_hash hash table. */
10065 *slot = cu->line_header;
10066 cu->line_header_die_owner = NULL;
10070 /* We cannot free any current entry in (*slot) as that struct line_header
10071 may be already used by multiple CUs. Create only temporary decoded
10072 line_header for this CU - it may happen at most once for each line
10073 number information unit. And if we're not using line_header_hash
10074 then this is what we want as well. */
10075 gdb_assert (die->tag != DW_TAG_partial_unit);
10077 decode_mapping = (die->tag != DW_TAG_partial_unit);
10078 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
10083 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
10086 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
10088 struct objfile *objfile = dwarf2_per_objfile->objfile;
10089 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10090 CORE_ADDR lowpc = ((CORE_ADDR) -1);
10091 CORE_ADDR highpc = ((CORE_ADDR) 0);
10092 struct attribute *attr;
10093 struct die_info *child_die;
10094 CORE_ADDR baseaddr;
10096 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10098 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
10100 /* If we didn't find a lowpc, set it to highpc to avoid complaints
10101 from finish_block. */
10102 if (lowpc == ((CORE_ADDR) -1))
10104 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
10106 file_and_directory fnd = find_file_and_directory (die, cu);
10108 prepare_one_comp_unit (cu, die, cu->language);
10110 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
10111 standardised yet. As a workaround for the language detection we fall
10112 back to the DW_AT_producer string. */
10113 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
10114 cu->language = language_opencl;
10116 /* Similar hack for Go. */
10117 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
10118 set_cu_language (DW_LANG_Go, cu);
10120 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
10122 /* Decode line number information if present. We do this before
10123 processing child DIEs, so that the line header table is available
10124 for DW_AT_decl_file. */
10125 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
10127 /* Process all dies in compilation unit. */
10128 if (die->child != NULL)
10130 child_die = die->child;
10131 while (child_die && child_die->tag)
10133 process_die (child_die, cu);
10134 child_die = sibling_die (child_die);
10138 /* Decode macro information, if present. Dwarf 2 macro information
10139 refers to information in the line number info statement program
10140 header, so we can only read it if we've read the header
10142 attr = dwarf2_attr (die, DW_AT_macros, cu);
10144 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
10145 if (attr && cu->line_header)
10147 if (dwarf2_attr (die, DW_AT_macro_info, cu))
10148 complaint (&symfile_complaints,
10149 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
10151 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
10155 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
10156 if (attr && cu->line_header)
10158 unsigned int macro_offset = DW_UNSND (attr);
10160 dwarf_decode_macros (cu, macro_offset, 0);
10165 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
10166 Create the set of symtabs used by this TU, or if this TU is sharing
10167 symtabs with another TU and the symtabs have already been created
10168 then restore those symtabs in the line header.
10169 We don't need the pc/line-number mapping for type units. */
10172 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
10174 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
10175 struct type_unit_group *tu_group;
10177 struct attribute *attr;
10179 struct signatured_type *sig_type;
10181 gdb_assert (per_cu->is_debug_types);
10182 sig_type = (struct signatured_type *) per_cu;
10184 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
10186 /* If we're using .gdb_index (includes -readnow) then
10187 per_cu->type_unit_group may not have been set up yet. */
10188 if (sig_type->type_unit_group == NULL)
10189 sig_type->type_unit_group = get_type_unit_group (cu, attr);
10190 tu_group = sig_type->type_unit_group;
10192 /* If we've already processed this stmt_list there's no real need to
10193 do it again, we could fake it and just recreate the part we need
10194 (file name,index -> symtab mapping). If data shows this optimization
10195 is useful we can do it then. */
10196 first_time = tu_group->compunit_symtab == NULL;
10198 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
10203 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
10204 lh = dwarf_decode_line_header (line_offset, cu);
10209 dwarf2_start_symtab (cu, "", NULL, 0);
10212 gdb_assert (tu_group->symtabs == NULL);
10213 restart_symtab (tu_group->compunit_symtab, "", 0);
10218 cu->line_header = lh.release ();
10219 cu->line_header_die_owner = die;
10223 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
10225 /* Note: We don't assign tu_group->compunit_symtab yet because we're
10226 still initializing it, and our caller (a few levels up)
10227 process_full_type_unit still needs to know if this is the first
10230 tu_group->num_symtabs = cu->line_header->file_names.size ();
10231 tu_group->symtabs = XNEWVEC (struct symtab *,
10232 cu->line_header->file_names.size ());
10234 for (i = 0; i < cu->line_header->file_names.size (); ++i)
10236 file_entry &fe = cu->line_header->file_names[i];
10238 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
10240 if (current_subfile->symtab == NULL)
10242 /* NOTE: start_subfile will recognize when it's been
10243 passed a file it has already seen. So we can't
10244 assume there's a simple mapping from
10245 cu->line_header->file_names to subfiles, plus
10246 cu->line_header->file_names may contain dups. */
10247 current_subfile->symtab
10248 = allocate_symtab (cust, current_subfile->name);
10251 fe.symtab = current_subfile->symtab;
10252 tu_group->symtabs[i] = fe.symtab;
10257 restart_symtab (tu_group->compunit_symtab, "", 0);
10259 for (i = 0; i < cu->line_header->file_names.size (); ++i)
10261 file_entry &fe = cu->line_header->file_names[i];
10263 fe.symtab = tu_group->symtabs[i];
10267 /* The main symtab is allocated last. Type units don't have DW_AT_name
10268 so they don't have a "real" (so to speak) symtab anyway.
10269 There is later code that will assign the main symtab to all symbols
10270 that don't have one. We need to handle the case of a symbol with a
10271 missing symtab (DW_AT_decl_file) anyway. */
10274 /* Process DW_TAG_type_unit.
10275 For TUs we want to skip the first top level sibling if it's not the
10276 actual type being defined by this TU. In this case the first top
10277 level sibling is there to provide context only. */
10280 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
10282 struct die_info *child_die;
10284 prepare_one_comp_unit (cu, die, language_minimal);
10286 /* Initialize (or reinitialize) the machinery for building symtabs.
10287 We do this before processing child DIEs, so that the line header table
10288 is available for DW_AT_decl_file. */
10289 setup_type_unit_groups (die, cu);
10291 if (die->child != NULL)
10293 child_die = die->child;
10294 while (child_die && child_die->tag)
10296 process_die (child_die, cu);
10297 child_die = sibling_die (child_die);
10304 http://gcc.gnu.org/wiki/DebugFission
10305 http://gcc.gnu.org/wiki/DebugFissionDWP
10307 To simplify handling of both DWO files ("object" files with the DWARF info)
10308 and DWP files (a file with the DWOs packaged up into one file), we treat
10309 DWP files as having a collection of virtual DWO files. */
10312 hash_dwo_file (const void *item)
10314 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
10317 hash = htab_hash_string (dwo_file->dwo_name);
10318 if (dwo_file->comp_dir != NULL)
10319 hash += htab_hash_string (dwo_file->comp_dir);
10324 eq_dwo_file (const void *item_lhs, const void *item_rhs)
10326 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
10327 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
10329 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
10331 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
10332 return lhs->comp_dir == rhs->comp_dir;
10333 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
10336 /* Allocate a hash table for DWO files. */
10339 allocate_dwo_file_hash_table (void)
10341 struct objfile *objfile = dwarf2_per_objfile->objfile;
10343 return htab_create_alloc_ex (41,
10347 &objfile->objfile_obstack,
10348 hashtab_obstack_allocate,
10349 dummy_obstack_deallocate);
10352 /* Lookup DWO file DWO_NAME. */
10355 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
10357 struct dwo_file find_entry;
10360 if (dwarf2_per_objfile->dwo_files == NULL)
10361 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
10363 memset (&find_entry, 0, sizeof (find_entry));
10364 find_entry.dwo_name = dwo_name;
10365 find_entry.comp_dir = comp_dir;
10366 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
10372 hash_dwo_unit (const void *item)
10374 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
10376 /* This drops the top 32 bits of the id, but is ok for a hash. */
10377 return dwo_unit->signature;
10381 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
10383 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
10384 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
10386 /* The signature is assumed to be unique within the DWO file.
10387 So while object file CU dwo_id's always have the value zero,
10388 that's OK, assuming each object file DWO file has only one CU,
10389 and that's the rule for now. */
10390 return lhs->signature == rhs->signature;
10393 /* Allocate a hash table for DWO CUs,TUs.
10394 There is one of these tables for each of CUs,TUs for each DWO file. */
10397 allocate_dwo_unit_table (struct objfile *objfile)
10399 /* Start out with a pretty small number.
10400 Generally DWO files contain only one CU and maybe some TUs. */
10401 return htab_create_alloc_ex (3,
10405 &objfile->objfile_obstack,
10406 hashtab_obstack_allocate,
10407 dummy_obstack_deallocate);
10410 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
10412 struct create_dwo_cu_data
10414 struct dwo_file *dwo_file;
10415 struct dwo_unit dwo_unit;
10418 /* die_reader_func for create_dwo_cu. */
10421 create_dwo_cu_reader (const struct die_reader_specs *reader,
10422 const gdb_byte *info_ptr,
10423 struct die_info *comp_unit_die,
10427 struct dwarf2_cu *cu = reader->cu;
10428 sect_offset sect_off = cu->per_cu->sect_off;
10429 struct dwarf2_section_info *section = cu->per_cu->section;
10430 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
10431 struct dwo_file *dwo_file = data->dwo_file;
10432 struct dwo_unit *dwo_unit = &data->dwo_unit;
10433 struct attribute *attr;
10435 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
10438 complaint (&symfile_complaints,
10439 _("Dwarf Error: debug entry at offset 0x%x is missing"
10440 " its dwo_id [in module %s]"),
10441 to_underlying (sect_off), dwo_file->dwo_name);
10445 dwo_unit->dwo_file = dwo_file;
10446 dwo_unit->signature = DW_UNSND (attr);
10447 dwo_unit->section = section;
10448 dwo_unit->sect_off = sect_off;
10449 dwo_unit->length = cu->per_cu->length;
10451 if (dwarf_read_debug)
10452 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
10453 to_underlying (sect_off),
10454 hex_string (dwo_unit->signature));
10457 /* Create the dwo_units for the CUs in a DWO_FILE.
10458 Note: This function processes DWO files only, not DWP files. */
10461 create_cus_hash_table (struct dwo_file &dwo_file, dwarf2_section_info §ion,
10464 struct objfile *objfile = dwarf2_per_objfile->objfile;
10465 const struct dwarf2_section_info *abbrev_section = &dwo_file.sections.abbrev;
10466 const gdb_byte *info_ptr, *end_ptr;
10468 dwarf2_read_section (objfile, §ion);
10469 info_ptr = section.buffer;
10471 if (info_ptr == NULL)
10474 if (dwarf_read_debug)
10476 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
10477 get_section_name (§ion),
10478 get_section_file_name (§ion));
10481 end_ptr = info_ptr + section.size;
10482 while (info_ptr < end_ptr)
10484 struct dwarf2_per_cu_data per_cu;
10485 struct create_dwo_cu_data create_dwo_cu_data;
10486 struct dwo_unit *dwo_unit;
10488 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
10490 memset (&create_dwo_cu_data.dwo_unit, 0,
10491 sizeof (create_dwo_cu_data.dwo_unit));
10492 memset (&per_cu, 0, sizeof (per_cu));
10493 per_cu.objfile = objfile;
10494 per_cu.is_debug_types = 0;
10495 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
10496 per_cu.section = §ion;
10497 create_dwo_cu_data.dwo_file = &dwo_file;
10499 init_cutu_and_read_dies_no_follow (
10500 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
10501 info_ptr += per_cu.length;
10503 // If the unit could not be parsed, skip it.
10504 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
10507 if (cus_htab == NULL)
10508 cus_htab = allocate_dwo_unit_table (objfile);
10510 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10511 *dwo_unit = create_dwo_cu_data.dwo_unit;
10512 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
10513 gdb_assert (slot != NULL);
10516 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
10517 sect_offset dup_sect_off = dup_cu->sect_off;
10519 complaint (&symfile_complaints,
10520 _("debug cu entry at offset 0x%x is duplicate to"
10521 " the entry at offset 0x%x, signature %s"),
10522 to_underlying (sect_off), to_underlying (dup_sect_off),
10523 hex_string (dwo_unit->signature));
10525 *slot = (void *)dwo_unit;
10529 /* DWP file .debug_{cu,tu}_index section format:
10530 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
10534 Both index sections have the same format, and serve to map a 64-bit
10535 signature to a set of section numbers. Each section begins with a header,
10536 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
10537 indexes, and a pool of 32-bit section numbers. The index sections will be
10538 aligned at 8-byte boundaries in the file.
10540 The index section header consists of:
10542 V, 32 bit version number
10544 N, 32 bit number of compilation units or type units in the index
10545 M, 32 bit number of slots in the hash table
10547 Numbers are recorded using the byte order of the application binary.
10549 The hash table begins at offset 16 in the section, and consists of an array
10550 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
10551 order of the application binary). Unused slots in the hash table are 0.
10552 (We rely on the extreme unlikeliness of a signature being exactly 0.)
10554 The parallel table begins immediately after the hash table
10555 (at offset 16 + 8 * M from the beginning of the section), and consists of an
10556 array of 32-bit indexes (using the byte order of the application binary),
10557 corresponding 1-1 with slots in the hash table. Each entry in the parallel
10558 table contains a 32-bit index into the pool of section numbers. For unused
10559 hash table slots, the corresponding entry in the parallel table will be 0.
10561 The pool of section numbers begins immediately following the hash table
10562 (at offset 16 + 12 * M from the beginning of the section). The pool of
10563 section numbers consists of an array of 32-bit words (using the byte order
10564 of the application binary). Each item in the array is indexed starting
10565 from 0. The hash table entry provides the index of the first section
10566 number in the set. Additional section numbers in the set follow, and the
10567 set is terminated by a 0 entry (section number 0 is not used in ELF).
10569 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
10570 section must be the first entry in the set, and the .debug_abbrev.dwo must
10571 be the second entry. Other members of the set may follow in any order.
10577 DWP Version 2 combines all the .debug_info, etc. sections into one,
10578 and the entries in the index tables are now offsets into these sections.
10579 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
10582 Index Section Contents:
10584 Hash Table of Signatures dwp_hash_table.hash_table
10585 Parallel Table of Indices dwp_hash_table.unit_table
10586 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
10587 Table of Section Sizes dwp_hash_table.v2.sizes
10589 The index section header consists of:
10591 V, 32 bit version number
10592 L, 32 bit number of columns in the table of section offsets
10593 N, 32 bit number of compilation units or type units in the index
10594 M, 32 bit number of slots in the hash table
10596 Numbers are recorded using the byte order of the application binary.
10598 The hash table has the same format as version 1.
10599 The parallel table of indices has the same format as version 1,
10600 except that the entries are origin-1 indices into the table of sections
10601 offsets and the table of section sizes.
10603 The table of offsets begins immediately following the parallel table
10604 (at offset 16 + 12 * M from the beginning of the section). The table is
10605 a two-dimensional array of 32-bit words (using the byte order of the
10606 application binary), with L columns and N+1 rows, in row-major order.
10607 Each row in the array is indexed starting from 0. The first row provides
10608 a key to the remaining rows: each column in this row provides an identifier
10609 for a debug section, and the offsets in the same column of subsequent rows
10610 refer to that section. The section identifiers are:
10612 DW_SECT_INFO 1 .debug_info.dwo
10613 DW_SECT_TYPES 2 .debug_types.dwo
10614 DW_SECT_ABBREV 3 .debug_abbrev.dwo
10615 DW_SECT_LINE 4 .debug_line.dwo
10616 DW_SECT_LOC 5 .debug_loc.dwo
10617 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
10618 DW_SECT_MACINFO 7 .debug_macinfo.dwo
10619 DW_SECT_MACRO 8 .debug_macro.dwo
10621 The offsets provided by the CU and TU index sections are the base offsets
10622 for the contributions made by each CU or TU to the corresponding section
10623 in the package file. Each CU and TU header contains an abbrev_offset
10624 field, used to find the abbreviations table for that CU or TU within the
10625 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
10626 be interpreted as relative to the base offset given in the index section.
10627 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
10628 should be interpreted as relative to the base offset for .debug_line.dwo,
10629 and offsets into other debug sections obtained from DWARF attributes should
10630 also be interpreted as relative to the corresponding base offset.
10632 The table of sizes begins immediately following the table of offsets.
10633 Like the table of offsets, it is a two-dimensional array of 32-bit words,
10634 with L columns and N rows, in row-major order. Each row in the array is
10635 indexed starting from 1 (row 0 is shared by the two tables).
10639 Hash table lookup is handled the same in version 1 and 2:
10641 We assume that N and M will not exceed 2^32 - 1.
10642 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
10644 Given a 64-bit compilation unit signature or a type signature S, an entry
10645 in the hash table is located as follows:
10647 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
10648 the low-order k bits all set to 1.
10650 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
10652 3) If the hash table entry at index H matches the signature, use that
10653 entry. If the hash table entry at index H is unused (all zeroes),
10654 terminate the search: the signature is not present in the table.
10656 4) Let H = (H + H') modulo M. Repeat at Step 3.
10658 Because M > N and H' and M are relatively prime, the search is guaranteed
10659 to stop at an unused slot or find the match. */
10661 /* Create a hash table to map DWO IDs to their CU/TU entry in
10662 .debug_{info,types}.dwo in DWP_FILE.
10663 Returns NULL if there isn't one.
10664 Note: This function processes DWP files only, not DWO files. */
10666 static struct dwp_hash_table *
10667 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
10669 struct objfile *objfile = dwarf2_per_objfile->objfile;
10670 bfd *dbfd = dwp_file->dbfd;
10671 const gdb_byte *index_ptr, *index_end;
10672 struct dwarf2_section_info *index;
10673 uint32_t version, nr_columns, nr_units, nr_slots;
10674 struct dwp_hash_table *htab;
10676 if (is_debug_types)
10677 index = &dwp_file->sections.tu_index;
10679 index = &dwp_file->sections.cu_index;
10681 if (dwarf2_section_empty_p (index))
10683 dwarf2_read_section (objfile, index);
10685 index_ptr = index->buffer;
10686 index_end = index_ptr + index->size;
10688 version = read_4_bytes (dbfd, index_ptr);
10691 nr_columns = read_4_bytes (dbfd, index_ptr);
10695 nr_units = read_4_bytes (dbfd, index_ptr);
10697 nr_slots = read_4_bytes (dbfd, index_ptr);
10700 if (version != 1 && version != 2)
10702 error (_("Dwarf Error: unsupported DWP file version (%s)"
10703 " [in module %s]"),
10704 pulongest (version), dwp_file->name);
10706 if (nr_slots != (nr_slots & -nr_slots))
10708 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
10709 " is not power of 2 [in module %s]"),
10710 pulongest (nr_slots), dwp_file->name);
10713 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
10714 htab->version = version;
10715 htab->nr_columns = nr_columns;
10716 htab->nr_units = nr_units;
10717 htab->nr_slots = nr_slots;
10718 htab->hash_table = index_ptr;
10719 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
10721 /* Exit early if the table is empty. */
10722 if (nr_slots == 0 || nr_units == 0
10723 || (version == 2 && nr_columns == 0))
10725 /* All must be zero. */
10726 if (nr_slots != 0 || nr_units != 0
10727 || (version == 2 && nr_columns != 0))
10729 complaint (&symfile_complaints,
10730 _("Empty DWP but nr_slots,nr_units,nr_columns not"
10731 " all zero [in modules %s]"),
10739 htab->section_pool.v1.indices =
10740 htab->unit_table + sizeof (uint32_t) * nr_slots;
10741 /* It's harder to decide whether the section is too small in v1.
10742 V1 is deprecated anyway so we punt. */
10746 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
10747 int *ids = htab->section_pool.v2.section_ids;
10748 /* Reverse map for error checking. */
10749 int ids_seen[DW_SECT_MAX + 1];
10752 if (nr_columns < 2)
10754 error (_("Dwarf Error: bad DWP hash table, too few columns"
10755 " in section table [in module %s]"),
10758 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
10760 error (_("Dwarf Error: bad DWP hash table, too many columns"
10761 " in section table [in module %s]"),
10764 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10765 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
10766 for (i = 0; i < nr_columns; ++i)
10768 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
10770 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
10772 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
10773 " in section table [in module %s]"),
10774 id, dwp_file->name);
10776 if (ids_seen[id] != -1)
10778 error (_("Dwarf Error: bad DWP hash table, duplicate section"
10779 " id %d in section table [in module %s]"),
10780 id, dwp_file->name);
10785 /* Must have exactly one info or types section. */
10786 if (((ids_seen[DW_SECT_INFO] != -1)
10787 + (ids_seen[DW_SECT_TYPES] != -1))
10790 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
10791 " DWO info/types section [in module %s]"),
10794 /* Must have an abbrev section. */
10795 if (ids_seen[DW_SECT_ABBREV] == -1)
10797 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
10798 " section [in module %s]"),
10801 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
10802 htab->section_pool.v2.sizes =
10803 htab->section_pool.v2.offsets + (sizeof (uint32_t)
10804 * nr_units * nr_columns);
10805 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
10806 * nr_units * nr_columns))
10809 error (_("Dwarf Error: DWP index section is corrupt (too small)"
10810 " [in module %s]"),
10818 /* Update SECTIONS with the data from SECTP.
10820 This function is like the other "locate" section routines that are
10821 passed to bfd_map_over_sections, but in this context the sections to
10822 read comes from the DWP V1 hash table, not the full ELF section table.
10824 The result is non-zero for success, or zero if an error was found. */
10827 locate_v1_virtual_dwo_sections (asection *sectp,
10828 struct virtual_v1_dwo_sections *sections)
10830 const struct dwop_section_names *names = &dwop_section_names;
10832 if (section_is_p (sectp->name, &names->abbrev_dwo))
10834 /* There can be only one. */
10835 if (sections->abbrev.s.section != NULL)
10837 sections->abbrev.s.section = sectp;
10838 sections->abbrev.size = bfd_get_section_size (sectp);
10840 else if (section_is_p (sectp->name, &names->info_dwo)
10841 || section_is_p (sectp->name, &names->types_dwo))
10843 /* There can be only one. */
10844 if (sections->info_or_types.s.section != NULL)
10846 sections->info_or_types.s.section = sectp;
10847 sections->info_or_types.size = bfd_get_section_size (sectp);
10849 else if (section_is_p (sectp->name, &names->line_dwo))
10851 /* There can be only one. */
10852 if (sections->line.s.section != NULL)
10854 sections->line.s.section = sectp;
10855 sections->line.size = bfd_get_section_size (sectp);
10857 else if (section_is_p (sectp->name, &names->loc_dwo))
10859 /* There can be only one. */
10860 if (sections->loc.s.section != NULL)
10862 sections->loc.s.section = sectp;
10863 sections->loc.size = bfd_get_section_size (sectp);
10865 else if (section_is_p (sectp->name, &names->macinfo_dwo))
10867 /* There can be only one. */
10868 if (sections->macinfo.s.section != NULL)
10870 sections->macinfo.s.section = sectp;
10871 sections->macinfo.size = bfd_get_section_size (sectp);
10873 else if (section_is_p (sectp->name, &names->macro_dwo))
10875 /* There can be only one. */
10876 if (sections->macro.s.section != NULL)
10878 sections->macro.s.section = sectp;
10879 sections->macro.size = bfd_get_section_size (sectp);
10881 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
10883 /* There can be only one. */
10884 if (sections->str_offsets.s.section != NULL)
10886 sections->str_offsets.s.section = sectp;
10887 sections->str_offsets.size = bfd_get_section_size (sectp);
10891 /* No other kind of section is valid. */
10898 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
10899 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
10900 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
10901 This is for DWP version 1 files. */
10903 static struct dwo_unit *
10904 create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file,
10905 uint32_t unit_index,
10906 const char *comp_dir,
10907 ULONGEST signature, int is_debug_types)
10909 struct objfile *objfile = dwarf2_per_objfile->objfile;
10910 const struct dwp_hash_table *dwp_htab =
10911 is_debug_types ? dwp_file->tus : dwp_file->cus;
10912 bfd *dbfd = dwp_file->dbfd;
10913 const char *kind = is_debug_types ? "TU" : "CU";
10914 struct dwo_file *dwo_file;
10915 struct dwo_unit *dwo_unit;
10916 struct virtual_v1_dwo_sections sections;
10917 void **dwo_file_slot;
10920 gdb_assert (dwp_file->version == 1);
10922 if (dwarf_read_debug)
10924 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
10926 pulongest (unit_index), hex_string (signature),
10930 /* Fetch the sections of this DWO unit.
10931 Put a limit on the number of sections we look for so that bad data
10932 doesn't cause us to loop forever. */
10934 #define MAX_NR_V1_DWO_SECTIONS \
10935 (1 /* .debug_info or .debug_types */ \
10936 + 1 /* .debug_abbrev */ \
10937 + 1 /* .debug_line */ \
10938 + 1 /* .debug_loc */ \
10939 + 1 /* .debug_str_offsets */ \
10940 + 1 /* .debug_macro or .debug_macinfo */ \
10941 + 1 /* trailing zero */)
10943 memset (§ions, 0, sizeof (sections));
10945 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
10948 uint32_t section_nr =
10949 read_4_bytes (dbfd,
10950 dwp_htab->section_pool.v1.indices
10951 + (unit_index + i) * sizeof (uint32_t));
10953 if (section_nr == 0)
10955 if (section_nr >= dwp_file->num_sections)
10957 error (_("Dwarf Error: bad DWP hash table, section number too large"
10958 " [in module %s]"),
10962 sectp = dwp_file->elf_sections[section_nr];
10963 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
10965 error (_("Dwarf Error: bad DWP hash table, invalid section found"
10966 " [in module %s]"),
10972 || dwarf2_section_empty_p (§ions.info_or_types)
10973 || dwarf2_section_empty_p (§ions.abbrev))
10975 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
10976 " [in module %s]"),
10979 if (i == MAX_NR_V1_DWO_SECTIONS)
10981 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
10982 " [in module %s]"),
10986 /* It's easier for the rest of the code if we fake a struct dwo_file and
10987 have dwo_unit "live" in that. At least for now.
10989 The DWP file can be made up of a random collection of CUs and TUs.
10990 However, for each CU + set of TUs that came from the same original DWO
10991 file, we can combine them back into a virtual DWO file to save space
10992 (fewer struct dwo_file objects to allocate). Remember that for really
10993 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
10995 std::string virtual_dwo_name =
10996 string_printf ("virtual-dwo/%d-%d-%d-%d",
10997 get_section_id (§ions.abbrev),
10998 get_section_id (§ions.line),
10999 get_section_id (§ions.loc),
11000 get_section_id (§ions.str_offsets));
11001 /* Can we use an existing virtual DWO file? */
11002 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name.c_str (), comp_dir);
11003 /* Create one if necessary. */
11004 if (*dwo_file_slot == NULL)
11006 if (dwarf_read_debug)
11008 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
11009 virtual_dwo_name.c_str ());
11011 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
11013 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
11014 virtual_dwo_name.c_str (),
11015 virtual_dwo_name.size ());
11016 dwo_file->comp_dir = comp_dir;
11017 dwo_file->sections.abbrev = sections.abbrev;
11018 dwo_file->sections.line = sections.line;
11019 dwo_file->sections.loc = sections.loc;
11020 dwo_file->sections.macinfo = sections.macinfo;
11021 dwo_file->sections.macro = sections.macro;
11022 dwo_file->sections.str_offsets = sections.str_offsets;
11023 /* The "str" section is global to the entire DWP file. */
11024 dwo_file->sections.str = dwp_file->sections.str;
11025 /* The info or types section is assigned below to dwo_unit,
11026 there's no need to record it in dwo_file.
11027 Also, we can't simply record type sections in dwo_file because
11028 we record a pointer into the vector in dwo_unit. As we collect more
11029 types we'll grow the vector and eventually have to reallocate space
11030 for it, invalidating all copies of pointers into the previous
11032 *dwo_file_slot = dwo_file;
11036 if (dwarf_read_debug)
11038 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
11039 virtual_dwo_name.c_str ());
11041 dwo_file = (struct dwo_file *) *dwo_file_slot;
11044 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11045 dwo_unit->dwo_file = dwo_file;
11046 dwo_unit->signature = signature;
11047 dwo_unit->section =
11048 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
11049 *dwo_unit->section = sections.info_or_types;
11050 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
11055 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
11056 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
11057 piece within that section used by a TU/CU, return a virtual section
11058 of just that piece. */
11060 static struct dwarf2_section_info
11061 create_dwp_v2_section (struct dwarf2_section_info *section,
11062 bfd_size_type offset, bfd_size_type size)
11064 struct dwarf2_section_info result;
11067 gdb_assert (section != NULL);
11068 gdb_assert (!section->is_virtual);
11070 memset (&result, 0, sizeof (result));
11071 result.s.containing_section = section;
11072 result.is_virtual = 1;
11077 sectp = get_section_bfd_section (section);
11079 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
11080 bounds of the real section. This is a pretty-rare event, so just
11081 flag an error (easier) instead of a warning and trying to cope. */
11083 || offset + size > bfd_get_section_size (sectp))
11085 bfd *abfd = sectp->owner;
11087 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
11088 " in section %s [in module %s]"),
11089 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
11090 objfile_name (dwarf2_per_objfile->objfile));
11093 result.virtual_offset = offset;
11094 result.size = size;
11098 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
11099 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
11100 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
11101 This is for DWP version 2 files. */
11103 static struct dwo_unit *
11104 create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file,
11105 uint32_t unit_index,
11106 const char *comp_dir,
11107 ULONGEST signature, int is_debug_types)
11109 struct objfile *objfile = dwarf2_per_objfile->objfile;
11110 const struct dwp_hash_table *dwp_htab =
11111 is_debug_types ? dwp_file->tus : dwp_file->cus;
11112 bfd *dbfd = dwp_file->dbfd;
11113 const char *kind = is_debug_types ? "TU" : "CU";
11114 struct dwo_file *dwo_file;
11115 struct dwo_unit *dwo_unit;
11116 struct virtual_v2_dwo_sections sections;
11117 void **dwo_file_slot;
11120 gdb_assert (dwp_file->version == 2);
11122 if (dwarf_read_debug)
11124 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
11126 pulongest (unit_index), hex_string (signature),
11130 /* Fetch the section offsets of this DWO unit. */
11132 memset (§ions, 0, sizeof (sections));
11134 for (i = 0; i < dwp_htab->nr_columns; ++i)
11136 uint32_t offset = read_4_bytes (dbfd,
11137 dwp_htab->section_pool.v2.offsets
11138 + (((unit_index - 1) * dwp_htab->nr_columns
11140 * sizeof (uint32_t)));
11141 uint32_t size = read_4_bytes (dbfd,
11142 dwp_htab->section_pool.v2.sizes
11143 + (((unit_index - 1) * dwp_htab->nr_columns
11145 * sizeof (uint32_t)));
11147 switch (dwp_htab->section_pool.v2.section_ids[i])
11150 case DW_SECT_TYPES:
11151 sections.info_or_types_offset = offset;
11152 sections.info_or_types_size = size;
11154 case DW_SECT_ABBREV:
11155 sections.abbrev_offset = offset;
11156 sections.abbrev_size = size;
11159 sections.line_offset = offset;
11160 sections.line_size = size;
11163 sections.loc_offset = offset;
11164 sections.loc_size = size;
11166 case DW_SECT_STR_OFFSETS:
11167 sections.str_offsets_offset = offset;
11168 sections.str_offsets_size = size;
11170 case DW_SECT_MACINFO:
11171 sections.macinfo_offset = offset;
11172 sections.macinfo_size = size;
11174 case DW_SECT_MACRO:
11175 sections.macro_offset = offset;
11176 sections.macro_size = size;
11181 /* It's easier for the rest of the code if we fake a struct dwo_file and
11182 have dwo_unit "live" in that. At least for now.
11184 The DWP file can be made up of a random collection of CUs and TUs.
11185 However, for each CU + set of TUs that came from the same original DWO
11186 file, we can combine them back into a virtual DWO file to save space
11187 (fewer struct dwo_file objects to allocate). Remember that for really
11188 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
11190 std::string virtual_dwo_name =
11191 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
11192 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
11193 (long) (sections.line_size ? sections.line_offset : 0),
11194 (long) (sections.loc_size ? sections.loc_offset : 0),
11195 (long) (sections.str_offsets_size
11196 ? sections.str_offsets_offset : 0));
11197 /* Can we use an existing virtual DWO file? */
11198 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name.c_str (), comp_dir);
11199 /* Create one if necessary. */
11200 if (*dwo_file_slot == NULL)
11202 if (dwarf_read_debug)
11204 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
11205 virtual_dwo_name.c_str ());
11207 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
11209 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
11210 virtual_dwo_name.c_str (),
11211 virtual_dwo_name.size ());
11212 dwo_file->comp_dir = comp_dir;
11213 dwo_file->sections.abbrev =
11214 create_dwp_v2_section (&dwp_file->sections.abbrev,
11215 sections.abbrev_offset, sections.abbrev_size);
11216 dwo_file->sections.line =
11217 create_dwp_v2_section (&dwp_file->sections.line,
11218 sections.line_offset, sections.line_size);
11219 dwo_file->sections.loc =
11220 create_dwp_v2_section (&dwp_file->sections.loc,
11221 sections.loc_offset, sections.loc_size);
11222 dwo_file->sections.macinfo =
11223 create_dwp_v2_section (&dwp_file->sections.macinfo,
11224 sections.macinfo_offset, sections.macinfo_size);
11225 dwo_file->sections.macro =
11226 create_dwp_v2_section (&dwp_file->sections.macro,
11227 sections.macro_offset, sections.macro_size);
11228 dwo_file->sections.str_offsets =
11229 create_dwp_v2_section (&dwp_file->sections.str_offsets,
11230 sections.str_offsets_offset,
11231 sections.str_offsets_size);
11232 /* The "str" section is global to the entire DWP file. */
11233 dwo_file->sections.str = dwp_file->sections.str;
11234 /* The info or types section is assigned below to dwo_unit,
11235 there's no need to record it in dwo_file.
11236 Also, we can't simply record type sections in dwo_file because
11237 we record a pointer into the vector in dwo_unit. As we collect more
11238 types we'll grow the vector and eventually have to reallocate space
11239 for it, invalidating all copies of pointers into the previous
11241 *dwo_file_slot = dwo_file;
11245 if (dwarf_read_debug)
11247 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
11248 virtual_dwo_name.c_str ());
11250 dwo_file = (struct dwo_file *) *dwo_file_slot;
11253 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11254 dwo_unit->dwo_file = dwo_file;
11255 dwo_unit->signature = signature;
11256 dwo_unit->section =
11257 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
11258 *dwo_unit->section = create_dwp_v2_section (is_debug_types
11259 ? &dwp_file->sections.types
11260 : &dwp_file->sections.info,
11261 sections.info_or_types_offset,
11262 sections.info_or_types_size);
11263 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
11268 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
11269 Returns NULL if the signature isn't found. */
11271 static struct dwo_unit *
11272 lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir,
11273 ULONGEST signature, int is_debug_types)
11275 const struct dwp_hash_table *dwp_htab =
11276 is_debug_types ? dwp_file->tus : dwp_file->cus;
11277 bfd *dbfd = dwp_file->dbfd;
11278 uint32_t mask = dwp_htab->nr_slots - 1;
11279 uint32_t hash = signature & mask;
11280 uint32_t hash2 = ((signature >> 32) & mask) | 1;
11283 struct dwo_unit find_dwo_cu;
11285 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
11286 find_dwo_cu.signature = signature;
11287 slot = htab_find_slot (is_debug_types
11288 ? dwp_file->loaded_tus
11289 : dwp_file->loaded_cus,
11290 &find_dwo_cu, INSERT);
11293 return (struct dwo_unit *) *slot;
11295 /* Use a for loop so that we don't loop forever on bad debug info. */
11296 for (i = 0; i < dwp_htab->nr_slots; ++i)
11298 ULONGEST signature_in_table;
11300 signature_in_table =
11301 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
11302 if (signature_in_table == signature)
11304 uint32_t unit_index =
11305 read_4_bytes (dbfd,
11306 dwp_htab->unit_table + hash * sizeof (uint32_t));
11308 if (dwp_file->version == 1)
11310 *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index,
11311 comp_dir, signature,
11316 *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index,
11317 comp_dir, signature,
11320 return (struct dwo_unit *) *slot;
11322 if (signature_in_table == 0)
11324 hash = (hash + hash2) & mask;
11327 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
11328 " [in module %s]"),
11332 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
11333 Open the file specified by FILE_NAME and hand it off to BFD for
11334 preliminary analysis. Return a newly initialized bfd *, which
11335 includes a canonicalized copy of FILE_NAME.
11336 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
11337 SEARCH_CWD is true if the current directory is to be searched.
11338 It will be searched before debug-file-directory.
11339 If successful, the file is added to the bfd include table of the
11340 objfile's bfd (see gdb_bfd_record_inclusion).
11341 If unable to find/open the file, return NULL.
11342 NOTE: This function is derived from symfile_bfd_open. */
11344 static gdb_bfd_ref_ptr
11345 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
11348 char *absolute_name;
11349 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
11350 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
11351 to debug_file_directory. */
11353 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
11357 if (*debug_file_directory != '\0')
11358 search_path = concat (".", dirname_separator_string,
11359 debug_file_directory, (char *) NULL);
11361 search_path = xstrdup (".");
11364 search_path = xstrdup (debug_file_directory);
11366 flags = OPF_RETURN_REALPATH;
11368 flags |= OPF_SEARCH_IN_PATH;
11369 desc = openp (search_path, flags, file_name,
11370 O_RDONLY | O_BINARY, &absolute_name);
11371 xfree (search_path);
11375 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name, gnutarget, desc));
11376 xfree (absolute_name);
11377 if (sym_bfd == NULL)
11379 bfd_set_cacheable (sym_bfd.get (), 1);
11381 if (!bfd_check_format (sym_bfd.get (), bfd_object))
11384 /* Success. Record the bfd as having been included by the objfile's bfd.
11385 This is important because things like demangled_names_hash lives in the
11386 objfile's per_bfd space and may have references to things like symbol
11387 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
11388 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
11393 /* Try to open DWO file FILE_NAME.
11394 COMP_DIR is the DW_AT_comp_dir attribute.
11395 The result is the bfd handle of the file.
11396 If there is a problem finding or opening the file, return NULL.
11397 Upon success, the canonicalized path of the file is stored in the bfd,
11398 same as symfile_bfd_open. */
11400 static gdb_bfd_ref_ptr
11401 open_dwo_file (const char *file_name, const char *comp_dir)
11403 if (IS_ABSOLUTE_PATH (file_name))
11404 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
11406 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
11408 if (comp_dir != NULL)
11410 char *path_to_try = concat (comp_dir, SLASH_STRING,
11411 file_name, (char *) NULL);
11413 /* NOTE: If comp_dir is a relative path, this will also try the
11414 search path, which seems useful. */
11415 gdb_bfd_ref_ptr abfd (try_open_dwop_file (path_to_try, 0 /*is_dwp*/,
11416 1 /*search_cwd*/));
11417 xfree (path_to_try);
11422 /* That didn't work, try debug-file-directory, which, despite its name,
11423 is a list of paths. */
11425 if (*debug_file_directory == '\0')
11428 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
11431 /* This function is mapped across the sections and remembers the offset and
11432 size of each of the DWO debugging sections we are interested in. */
11435 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
11437 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
11438 const struct dwop_section_names *names = &dwop_section_names;
11440 if (section_is_p (sectp->name, &names->abbrev_dwo))
11442 dwo_sections->abbrev.s.section = sectp;
11443 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
11445 else if (section_is_p (sectp->name, &names->info_dwo))
11447 dwo_sections->info.s.section = sectp;
11448 dwo_sections->info.size = bfd_get_section_size (sectp);
11450 else if (section_is_p (sectp->name, &names->line_dwo))
11452 dwo_sections->line.s.section = sectp;
11453 dwo_sections->line.size = bfd_get_section_size (sectp);
11455 else if (section_is_p (sectp->name, &names->loc_dwo))
11457 dwo_sections->loc.s.section = sectp;
11458 dwo_sections->loc.size = bfd_get_section_size (sectp);
11460 else if (section_is_p (sectp->name, &names->macinfo_dwo))
11462 dwo_sections->macinfo.s.section = sectp;
11463 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
11465 else if (section_is_p (sectp->name, &names->macro_dwo))
11467 dwo_sections->macro.s.section = sectp;
11468 dwo_sections->macro.size = bfd_get_section_size (sectp);
11470 else if (section_is_p (sectp->name, &names->str_dwo))
11472 dwo_sections->str.s.section = sectp;
11473 dwo_sections->str.size = bfd_get_section_size (sectp);
11475 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
11477 dwo_sections->str_offsets.s.section = sectp;
11478 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
11480 else if (section_is_p (sectp->name, &names->types_dwo))
11482 struct dwarf2_section_info type_section;
11484 memset (&type_section, 0, sizeof (type_section));
11485 type_section.s.section = sectp;
11486 type_section.size = bfd_get_section_size (sectp);
11487 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
11492 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
11493 by PER_CU. This is for the non-DWP case.
11494 The result is NULL if DWO_NAME can't be found. */
11496 static struct dwo_file *
11497 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
11498 const char *dwo_name, const char *comp_dir)
11500 struct objfile *objfile = dwarf2_per_objfile->objfile;
11501 struct dwo_file *dwo_file;
11502 struct cleanup *cleanups;
11504 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwo_name, comp_dir));
11507 if (dwarf_read_debug)
11508 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
11511 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
11512 dwo_file->dwo_name = dwo_name;
11513 dwo_file->comp_dir = comp_dir;
11514 dwo_file->dbfd = dbfd.release ();
11516 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
11518 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
11519 &dwo_file->sections);
11521 create_cus_hash_table (*dwo_file, dwo_file->sections.info, dwo_file->cus);
11523 create_debug_types_hash_table (dwo_file, dwo_file->sections.types,
11526 discard_cleanups (cleanups);
11528 if (dwarf_read_debug)
11529 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
11534 /* This function is mapped across the sections and remembers the offset and
11535 size of each of the DWP debugging sections common to version 1 and 2 that
11536 we are interested in. */
11539 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
11540 void *dwp_file_ptr)
11542 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
11543 const struct dwop_section_names *names = &dwop_section_names;
11544 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
11546 /* Record the ELF section number for later lookup: this is what the
11547 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
11548 gdb_assert (elf_section_nr < dwp_file->num_sections);
11549 dwp_file->elf_sections[elf_section_nr] = sectp;
11551 /* Look for specific sections that we need. */
11552 if (section_is_p (sectp->name, &names->str_dwo))
11554 dwp_file->sections.str.s.section = sectp;
11555 dwp_file->sections.str.size = bfd_get_section_size (sectp);
11557 else if (section_is_p (sectp->name, &names->cu_index))
11559 dwp_file->sections.cu_index.s.section = sectp;
11560 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
11562 else if (section_is_p (sectp->name, &names->tu_index))
11564 dwp_file->sections.tu_index.s.section = sectp;
11565 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
11569 /* This function is mapped across the sections and remembers the offset and
11570 size of each of the DWP version 2 debugging sections that we are interested
11571 in. This is split into a separate function because we don't know if we
11572 have version 1 or 2 until we parse the cu_index/tu_index sections. */
11575 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
11577 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
11578 const struct dwop_section_names *names = &dwop_section_names;
11579 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
11581 /* Record the ELF section number for later lookup: this is what the
11582 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
11583 gdb_assert (elf_section_nr < dwp_file->num_sections);
11584 dwp_file->elf_sections[elf_section_nr] = sectp;
11586 /* Look for specific sections that we need. */
11587 if (section_is_p (sectp->name, &names->abbrev_dwo))
11589 dwp_file->sections.abbrev.s.section = sectp;
11590 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
11592 else if (section_is_p (sectp->name, &names->info_dwo))
11594 dwp_file->sections.info.s.section = sectp;
11595 dwp_file->sections.info.size = bfd_get_section_size (sectp);
11597 else if (section_is_p (sectp->name, &names->line_dwo))
11599 dwp_file->sections.line.s.section = sectp;
11600 dwp_file->sections.line.size = bfd_get_section_size (sectp);
11602 else if (section_is_p (sectp->name, &names->loc_dwo))
11604 dwp_file->sections.loc.s.section = sectp;
11605 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
11607 else if (section_is_p (sectp->name, &names->macinfo_dwo))
11609 dwp_file->sections.macinfo.s.section = sectp;
11610 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
11612 else if (section_is_p (sectp->name, &names->macro_dwo))
11614 dwp_file->sections.macro.s.section = sectp;
11615 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
11617 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
11619 dwp_file->sections.str_offsets.s.section = sectp;
11620 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
11622 else if (section_is_p (sectp->name, &names->types_dwo))
11624 dwp_file->sections.types.s.section = sectp;
11625 dwp_file->sections.types.size = bfd_get_section_size (sectp);
11629 /* Hash function for dwp_file loaded CUs/TUs. */
11632 hash_dwp_loaded_cutus (const void *item)
11634 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11636 /* This drops the top 32 bits of the signature, but is ok for a hash. */
11637 return dwo_unit->signature;
11640 /* Equality function for dwp_file loaded CUs/TUs. */
11643 eq_dwp_loaded_cutus (const void *a, const void *b)
11645 const struct dwo_unit *dua = (const struct dwo_unit *) a;
11646 const struct dwo_unit *dub = (const struct dwo_unit *) b;
11648 return dua->signature == dub->signature;
11651 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
11654 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
11656 return htab_create_alloc_ex (3,
11657 hash_dwp_loaded_cutus,
11658 eq_dwp_loaded_cutus,
11660 &objfile->objfile_obstack,
11661 hashtab_obstack_allocate,
11662 dummy_obstack_deallocate);
11665 /* Try to open DWP file FILE_NAME.
11666 The result is the bfd handle of the file.
11667 If there is a problem finding or opening the file, return NULL.
11668 Upon success, the canonicalized path of the file is stored in the bfd,
11669 same as symfile_bfd_open. */
11671 static gdb_bfd_ref_ptr
11672 open_dwp_file (const char *file_name)
11674 gdb_bfd_ref_ptr abfd (try_open_dwop_file (file_name, 1 /*is_dwp*/,
11675 1 /*search_cwd*/));
11679 /* Work around upstream bug 15652.
11680 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
11681 [Whether that's a "bug" is debatable, but it is getting in our way.]
11682 We have no real idea where the dwp file is, because gdb's realpath-ing
11683 of the executable's path may have discarded the needed info.
11684 [IWBN if the dwp file name was recorded in the executable, akin to
11685 .gnu_debuglink, but that doesn't exist yet.]
11686 Strip the directory from FILE_NAME and search again. */
11687 if (*debug_file_directory != '\0')
11689 /* Don't implicitly search the current directory here.
11690 If the user wants to search "." to handle this case,
11691 it must be added to debug-file-directory. */
11692 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
11699 /* Initialize the use of the DWP file for the current objfile.
11700 By convention the name of the DWP file is ${objfile}.dwp.
11701 The result is NULL if it can't be found. */
11703 static struct dwp_file *
11704 open_and_init_dwp_file (void)
11706 struct objfile *objfile = dwarf2_per_objfile->objfile;
11707 struct dwp_file *dwp_file;
11709 /* Try to find first .dwp for the binary file before any symbolic links
11712 /* If the objfile is a debug file, find the name of the real binary
11713 file and get the name of dwp file from there. */
11714 std::string dwp_name;
11715 if (objfile->separate_debug_objfile_backlink != NULL)
11717 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
11718 const char *backlink_basename = lbasename (backlink->original_name);
11720 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
11723 dwp_name = objfile->original_name;
11725 dwp_name += ".dwp";
11727 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwp_name.c_str ()));
11729 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
11731 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
11732 dwp_name = objfile_name (objfile);
11733 dwp_name += ".dwp";
11734 dbfd = open_dwp_file (dwp_name.c_str ());
11739 if (dwarf_read_debug)
11740 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
11743 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
11744 dwp_file->name = bfd_get_filename (dbfd.get ());
11745 dwp_file->dbfd = dbfd.release ();
11747 /* +1: section 0 is unused */
11748 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
11749 dwp_file->elf_sections =
11750 OBSTACK_CALLOC (&objfile->objfile_obstack,
11751 dwp_file->num_sections, asection *);
11753 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
11756 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
11758 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
11760 /* The DWP file version is stored in the hash table. Oh well. */
11761 if (dwp_file->cus && dwp_file->tus
11762 && dwp_file->cus->version != dwp_file->tus->version)
11764 /* Technically speaking, we should try to limp along, but this is
11765 pretty bizarre. We use pulongest here because that's the established
11766 portability solution (e.g, we cannot use %u for uint32_t). */
11767 error (_("Dwarf Error: DWP file CU version %s doesn't match"
11768 " TU version %s [in DWP file %s]"),
11769 pulongest (dwp_file->cus->version),
11770 pulongest (dwp_file->tus->version), dwp_name.c_str ());
11774 dwp_file->version = dwp_file->cus->version;
11775 else if (dwp_file->tus)
11776 dwp_file->version = dwp_file->tus->version;
11778 dwp_file->version = 2;
11780 if (dwp_file->version == 2)
11781 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
11784 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
11785 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
11787 if (dwarf_read_debug)
11789 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
11790 fprintf_unfiltered (gdb_stdlog,
11791 " %s CUs, %s TUs\n",
11792 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
11793 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
11799 /* Wrapper around open_and_init_dwp_file, only open it once. */
11801 static struct dwp_file *
11802 get_dwp_file (void)
11804 if (! dwarf2_per_objfile->dwp_checked)
11806 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
11807 dwarf2_per_objfile->dwp_checked = 1;
11809 return dwarf2_per_objfile->dwp_file;
11812 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
11813 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
11814 or in the DWP file for the objfile, referenced by THIS_UNIT.
11815 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
11816 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
11818 This is called, for example, when wanting to read a variable with a
11819 complex location. Therefore we don't want to do file i/o for every call.
11820 Therefore we don't want to look for a DWO file on every call.
11821 Therefore we first see if we've already seen SIGNATURE in a DWP file,
11822 then we check if we've already seen DWO_NAME, and only THEN do we check
11825 The result is a pointer to the dwo_unit object or NULL if we didn't find it
11826 (dwo_id mismatch or couldn't find the DWO/DWP file). */
11828 static struct dwo_unit *
11829 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
11830 const char *dwo_name, const char *comp_dir,
11831 ULONGEST signature, int is_debug_types)
11833 struct objfile *objfile = dwarf2_per_objfile->objfile;
11834 const char *kind = is_debug_types ? "TU" : "CU";
11835 void **dwo_file_slot;
11836 struct dwo_file *dwo_file;
11837 struct dwp_file *dwp_file;
11839 /* First see if there's a DWP file.
11840 If we have a DWP file but didn't find the DWO inside it, don't
11841 look for the original DWO file. It makes gdb behave differently
11842 depending on whether one is debugging in the build tree. */
11844 dwp_file = get_dwp_file ();
11845 if (dwp_file != NULL)
11847 const struct dwp_hash_table *dwp_htab =
11848 is_debug_types ? dwp_file->tus : dwp_file->cus;
11850 if (dwp_htab != NULL)
11852 struct dwo_unit *dwo_cutu =
11853 lookup_dwo_unit_in_dwp (dwp_file, comp_dir,
11854 signature, is_debug_types);
11856 if (dwo_cutu != NULL)
11858 if (dwarf_read_debug)
11860 fprintf_unfiltered (gdb_stdlog,
11861 "Virtual DWO %s %s found: @%s\n",
11862 kind, hex_string (signature),
11863 host_address_to_string (dwo_cutu));
11871 /* No DWP file, look for the DWO file. */
11873 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
11874 if (*dwo_file_slot == NULL)
11876 /* Read in the file and build a table of the CUs/TUs it contains. */
11877 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
11879 /* NOTE: This will be NULL if unable to open the file. */
11880 dwo_file = (struct dwo_file *) *dwo_file_slot;
11882 if (dwo_file != NULL)
11884 struct dwo_unit *dwo_cutu = NULL;
11886 if (is_debug_types && dwo_file->tus)
11888 struct dwo_unit find_dwo_cutu;
11890 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11891 find_dwo_cutu.signature = signature;
11893 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
11895 else if (!is_debug_types && dwo_file->cus)
11897 struct dwo_unit find_dwo_cutu;
11899 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
11900 find_dwo_cutu.signature = signature;
11901 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
11905 if (dwo_cutu != NULL)
11907 if (dwarf_read_debug)
11909 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
11910 kind, dwo_name, hex_string (signature),
11911 host_address_to_string (dwo_cutu));
11918 /* We didn't find it. This could mean a dwo_id mismatch, or
11919 someone deleted the DWO/DWP file, or the search path isn't set up
11920 correctly to find the file. */
11922 if (dwarf_read_debug)
11924 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
11925 kind, dwo_name, hex_string (signature));
11928 /* This is a warning and not a complaint because it can be caused by
11929 pilot error (e.g., user accidentally deleting the DWO). */
11931 /* Print the name of the DWP file if we looked there, helps the user
11932 better diagnose the problem. */
11933 std::string dwp_text;
11935 if (dwp_file != NULL)
11936 dwp_text = string_printf (" [in DWP file %s]",
11937 lbasename (dwp_file->name));
11939 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
11940 " [in module %s]"),
11941 kind, dwo_name, hex_string (signature),
11943 this_unit->is_debug_types ? "TU" : "CU",
11944 to_underlying (this_unit->sect_off), objfile_name (objfile));
11949 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
11950 See lookup_dwo_cutu_unit for details. */
11952 static struct dwo_unit *
11953 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
11954 const char *dwo_name, const char *comp_dir,
11955 ULONGEST signature)
11957 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
11960 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
11961 See lookup_dwo_cutu_unit for details. */
11963 static struct dwo_unit *
11964 lookup_dwo_type_unit (struct signatured_type *this_tu,
11965 const char *dwo_name, const char *comp_dir)
11967 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
11970 /* Traversal function for queue_and_load_all_dwo_tus. */
11973 queue_and_load_dwo_tu (void **slot, void *info)
11975 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
11976 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
11977 ULONGEST signature = dwo_unit->signature;
11978 struct signatured_type *sig_type =
11979 lookup_dwo_signatured_type (per_cu->cu, signature);
11981 if (sig_type != NULL)
11983 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
11985 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
11986 a real dependency of PER_CU on SIG_TYPE. That is detected later
11987 while processing PER_CU. */
11988 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
11989 load_full_type_unit (sig_cu);
11990 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
11996 /* Queue all TUs contained in the DWO of PER_CU to be read in.
11997 The DWO may have the only definition of the type, though it may not be
11998 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
11999 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
12002 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
12004 struct dwo_unit *dwo_unit;
12005 struct dwo_file *dwo_file;
12007 gdb_assert (!per_cu->is_debug_types);
12008 gdb_assert (get_dwp_file () == NULL);
12009 gdb_assert (per_cu->cu != NULL);
12011 dwo_unit = per_cu->cu->dwo_unit;
12012 gdb_assert (dwo_unit != NULL);
12014 dwo_file = dwo_unit->dwo_file;
12015 if (dwo_file->tus != NULL)
12016 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
12019 /* Free all resources associated with DWO_FILE.
12020 Close the DWO file and munmap the sections.
12021 All memory should be on the objfile obstack. */
12024 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
12027 /* Note: dbfd is NULL for virtual DWO files. */
12028 gdb_bfd_unref (dwo_file->dbfd);
12030 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
12033 /* Wrapper for free_dwo_file for use in cleanups. */
12036 free_dwo_file_cleanup (void *arg)
12038 struct dwo_file *dwo_file = (struct dwo_file *) arg;
12039 struct objfile *objfile = dwarf2_per_objfile->objfile;
12041 free_dwo_file (dwo_file, objfile);
12044 /* Traversal function for free_dwo_files. */
12047 free_dwo_file_from_slot (void **slot, void *info)
12049 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
12050 struct objfile *objfile = (struct objfile *) info;
12052 free_dwo_file (dwo_file, objfile);
12057 /* Free all resources associated with DWO_FILES. */
12060 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
12062 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
12065 /* Read in various DIEs. */
12067 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
12068 Inherit only the children of the DW_AT_abstract_origin DIE not being
12069 already referenced by DW_AT_abstract_origin from the children of the
12073 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
12075 struct die_info *child_die;
12076 sect_offset *offsetp;
12077 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
12078 struct die_info *origin_die;
12079 /* Iterator of the ORIGIN_DIE children. */
12080 struct die_info *origin_child_die;
12081 struct attribute *attr;
12082 struct dwarf2_cu *origin_cu;
12083 struct pending **origin_previous_list_in_scope;
12085 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
12089 /* Note that following die references may follow to a die in a
12093 origin_die = follow_die_ref (die, attr, &origin_cu);
12095 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
12097 origin_previous_list_in_scope = origin_cu->list_in_scope;
12098 origin_cu->list_in_scope = cu->list_in_scope;
12100 if (die->tag != origin_die->tag
12101 && !(die->tag == DW_TAG_inlined_subroutine
12102 && origin_die->tag == DW_TAG_subprogram))
12103 complaint (&symfile_complaints,
12104 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
12105 to_underlying (die->sect_off),
12106 to_underlying (origin_die->sect_off));
12108 std::vector<sect_offset> offsets;
12110 for (child_die = die->child;
12111 child_die && child_die->tag;
12112 child_die = sibling_die (child_die))
12114 struct die_info *child_origin_die;
12115 struct dwarf2_cu *child_origin_cu;
12117 /* We are trying to process concrete instance entries:
12118 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
12119 it's not relevant to our analysis here. i.e. detecting DIEs that are
12120 present in the abstract instance but not referenced in the concrete
12122 if (child_die->tag == DW_TAG_call_site
12123 || child_die->tag == DW_TAG_GNU_call_site)
12126 /* For each CHILD_DIE, find the corresponding child of
12127 ORIGIN_DIE. If there is more than one layer of
12128 DW_AT_abstract_origin, follow them all; there shouldn't be,
12129 but GCC versions at least through 4.4 generate this (GCC PR
12131 child_origin_die = child_die;
12132 child_origin_cu = cu;
12135 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
12139 child_origin_die = follow_die_ref (child_origin_die, attr,
12143 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
12144 counterpart may exist. */
12145 if (child_origin_die != child_die)
12147 if (child_die->tag != child_origin_die->tag
12148 && !(child_die->tag == DW_TAG_inlined_subroutine
12149 && child_origin_die->tag == DW_TAG_subprogram))
12150 complaint (&symfile_complaints,
12151 _("Child DIE 0x%x and its abstract origin 0x%x have "
12153 to_underlying (child_die->sect_off),
12154 to_underlying (child_origin_die->sect_off));
12155 if (child_origin_die->parent != origin_die)
12156 complaint (&symfile_complaints,
12157 _("Child DIE 0x%x and its abstract origin 0x%x have "
12158 "different parents"),
12159 to_underlying (child_die->sect_off),
12160 to_underlying (child_origin_die->sect_off));
12162 offsets.push_back (child_origin_die->sect_off);
12165 std::sort (offsets.begin (), offsets.end ());
12166 sect_offset *offsets_end = offsets.data () + offsets.size ();
12167 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
12168 if (offsetp[-1] == *offsetp)
12169 complaint (&symfile_complaints,
12170 _("Multiple children of DIE 0x%x refer "
12171 "to DIE 0x%x as their abstract origin"),
12172 to_underlying (die->sect_off), to_underlying (*offsetp));
12174 offsetp = offsets.data ();
12175 origin_child_die = origin_die->child;
12176 while (origin_child_die && origin_child_die->tag)
12178 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
12179 while (offsetp < offsets_end
12180 && *offsetp < origin_child_die->sect_off)
12182 if (offsetp >= offsets_end
12183 || *offsetp > origin_child_die->sect_off)
12185 /* Found that ORIGIN_CHILD_DIE is really not referenced.
12186 Check whether we're already processing ORIGIN_CHILD_DIE.
12187 This can happen with mutually referenced abstract_origins.
12189 if (!origin_child_die->in_process)
12190 process_die (origin_child_die, origin_cu);
12192 origin_child_die = sibling_die (origin_child_die);
12194 origin_cu->list_in_scope = origin_previous_list_in_scope;
12198 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
12200 struct objfile *objfile = cu->objfile;
12201 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12202 struct context_stack *newobj;
12205 struct die_info *child_die;
12206 struct attribute *attr, *call_line, *call_file;
12208 CORE_ADDR baseaddr;
12209 struct block *block;
12210 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
12211 std::vector<struct symbol *> template_args;
12212 struct template_symbol *templ_func = NULL;
12216 /* If we do not have call site information, we can't show the
12217 caller of this inlined function. That's too confusing, so
12218 only use the scope for local variables. */
12219 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
12220 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
12221 if (call_line == NULL || call_file == NULL)
12223 read_lexical_block_scope (die, cu);
12228 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12230 name = dwarf2_name (die, cu);
12232 /* Ignore functions with missing or empty names. These are actually
12233 illegal according to the DWARF standard. */
12236 complaint (&symfile_complaints,
12237 _("missing name for subprogram DIE at %d"),
12238 to_underlying (die->sect_off));
12242 /* Ignore functions with missing or invalid low and high pc attributes. */
12243 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
12244 <= PC_BOUNDS_INVALID)
12246 attr = dwarf2_attr (die, DW_AT_external, cu);
12247 if (!attr || !DW_UNSND (attr))
12248 complaint (&symfile_complaints,
12249 _("cannot get low and high bounds "
12250 "for subprogram DIE at %d"),
12251 to_underlying (die->sect_off));
12255 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
12256 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
12258 /* If we have any template arguments, then we must allocate a
12259 different sort of symbol. */
12260 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
12262 if (child_die->tag == DW_TAG_template_type_param
12263 || child_die->tag == DW_TAG_template_value_param)
12265 templ_func = allocate_template_symbol (objfile);
12266 templ_func->is_cplus_template_function = 1;
12271 newobj = push_context (0, lowpc);
12272 newobj->name = new_symbol_full (die, read_type_die (die, cu), cu,
12273 (struct symbol *) templ_func);
12275 /* If there is a location expression for DW_AT_frame_base, record
12277 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
12279 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
12281 /* If there is a location for the static link, record it. */
12282 newobj->static_link = NULL;
12283 attr = dwarf2_attr (die, DW_AT_static_link, cu);
12286 newobj->static_link
12287 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
12288 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
12291 cu->list_in_scope = &local_symbols;
12293 if (die->child != NULL)
12295 child_die = die->child;
12296 while (child_die && child_die->tag)
12298 if (child_die->tag == DW_TAG_template_type_param
12299 || child_die->tag == DW_TAG_template_value_param)
12301 struct symbol *arg = new_symbol (child_die, NULL, cu);
12304 template_args.push_back (arg);
12307 process_die (child_die, cu);
12308 child_die = sibling_die (child_die);
12312 inherit_abstract_dies (die, cu);
12314 /* If we have a DW_AT_specification, we might need to import using
12315 directives from the context of the specification DIE. See the
12316 comment in determine_prefix. */
12317 if (cu->language == language_cplus
12318 && dwarf2_attr (die, DW_AT_specification, cu))
12320 struct dwarf2_cu *spec_cu = cu;
12321 struct die_info *spec_die = die_specification (die, &spec_cu);
12325 child_die = spec_die->child;
12326 while (child_die && child_die->tag)
12328 if (child_die->tag == DW_TAG_imported_module)
12329 process_die (child_die, spec_cu);
12330 child_die = sibling_die (child_die);
12333 /* In some cases, GCC generates specification DIEs that
12334 themselves contain DW_AT_specification attributes. */
12335 spec_die = die_specification (spec_die, &spec_cu);
12339 newobj = pop_context ();
12340 /* Make a block for the local symbols within. */
12341 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
12342 newobj->static_link, lowpc, highpc);
12344 /* For C++, set the block's scope. */
12345 if ((cu->language == language_cplus
12346 || cu->language == language_fortran
12347 || cu->language == language_d
12348 || cu->language == language_rust)
12349 && cu->processing_has_namespace_info)
12350 block_set_scope (block, determine_prefix (die, cu),
12351 &objfile->objfile_obstack);
12353 /* If we have address ranges, record them. */
12354 dwarf2_record_block_ranges (die, block, baseaddr, cu);
12356 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
12358 /* Attach template arguments to function. */
12359 if (!template_args.empty ())
12361 gdb_assert (templ_func != NULL);
12363 templ_func->n_template_arguments = template_args.size ();
12364 templ_func->template_arguments
12365 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
12366 templ_func->n_template_arguments);
12367 memcpy (templ_func->template_arguments,
12368 template_args.data (),
12369 (templ_func->n_template_arguments * sizeof (struct symbol *)));
12372 /* In C++, we can have functions nested inside functions (e.g., when
12373 a function declares a class that has methods). This means that
12374 when we finish processing a function scope, we may need to go
12375 back to building a containing block's symbol lists. */
12376 local_symbols = newobj->locals;
12377 local_using_directives = newobj->local_using_directives;
12379 /* If we've finished processing a top-level function, subsequent
12380 symbols go in the file symbol list. */
12381 if (outermost_context_p ())
12382 cu->list_in_scope = &file_symbols;
12385 /* Process all the DIES contained within a lexical block scope. Start
12386 a new scope, process the dies, and then close the scope. */
12389 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
12391 struct objfile *objfile = cu->objfile;
12392 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12393 struct context_stack *newobj;
12394 CORE_ADDR lowpc, highpc;
12395 struct die_info *child_die;
12396 CORE_ADDR baseaddr;
12398 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12400 /* Ignore blocks with missing or invalid low and high pc attributes. */
12401 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
12402 as multiple lexical blocks? Handling children in a sane way would
12403 be nasty. Might be easier to properly extend generic blocks to
12404 describe ranges. */
12405 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
12407 case PC_BOUNDS_NOT_PRESENT:
12408 /* DW_TAG_lexical_block has no attributes, process its children as if
12409 there was no wrapping by that DW_TAG_lexical_block.
12410 GCC does no longer produces such DWARF since GCC r224161. */
12411 for (child_die = die->child;
12412 child_die != NULL && child_die->tag;
12413 child_die = sibling_die (child_die))
12414 process_die (child_die, cu);
12416 case PC_BOUNDS_INVALID:
12419 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
12420 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
12422 push_context (0, lowpc);
12423 if (die->child != NULL)
12425 child_die = die->child;
12426 while (child_die && child_die->tag)
12428 process_die (child_die, cu);
12429 child_die = sibling_die (child_die);
12432 inherit_abstract_dies (die, cu);
12433 newobj = pop_context ();
12435 if (local_symbols != NULL || local_using_directives != NULL)
12437 struct block *block
12438 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
12439 newobj->start_addr, highpc);
12441 /* Note that recording ranges after traversing children, as we
12442 do here, means that recording a parent's ranges entails
12443 walking across all its children's ranges as they appear in
12444 the address map, which is quadratic behavior.
12446 It would be nicer to record the parent's ranges before
12447 traversing its children, simply overriding whatever you find
12448 there. But since we don't even decide whether to create a
12449 block until after we've traversed its children, that's hard
12451 dwarf2_record_block_ranges (die, block, baseaddr, cu);
12453 local_symbols = newobj->locals;
12454 local_using_directives = newobj->local_using_directives;
12457 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
12460 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
12462 struct objfile *objfile = cu->objfile;
12463 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12464 CORE_ADDR pc, baseaddr;
12465 struct attribute *attr;
12466 struct call_site *call_site, call_site_local;
12469 struct die_info *child_die;
12471 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12473 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
12476 /* This was a pre-DWARF-5 GNU extension alias
12477 for DW_AT_call_return_pc. */
12478 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12482 complaint (&symfile_complaints,
12483 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
12484 "DIE 0x%x [in module %s]"),
12485 to_underlying (die->sect_off), objfile_name (objfile));
12488 pc = attr_value_as_address (attr) + baseaddr;
12489 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
12491 if (cu->call_site_htab == NULL)
12492 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
12493 NULL, &objfile->objfile_obstack,
12494 hashtab_obstack_allocate, NULL);
12495 call_site_local.pc = pc;
12496 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
12499 complaint (&symfile_complaints,
12500 _("Duplicate PC %s for DW_TAG_call_site "
12501 "DIE 0x%x [in module %s]"),
12502 paddress (gdbarch, pc), to_underlying (die->sect_off),
12503 objfile_name (objfile));
12507 /* Count parameters at the caller. */
12510 for (child_die = die->child; child_die && child_die->tag;
12511 child_die = sibling_die (child_die))
12513 if (child_die->tag != DW_TAG_call_site_parameter
12514 && child_die->tag != DW_TAG_GNU_call_site_parameter)
12516 complaint (&symfile_complaints,
12517 _("Tag %d is not DW_TAG_call_site_parameter in "
12518 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12519 child_die->tag, to_underlying (child_die->sect_off),
12520 objfile_name (objfile));
12528 = ((struct call_site *)
12529 obstack_alloc (&objfile->objfile_obstack,
12530 sizeof (*call_site)
12531 + (sizeof (*call_site->parameter) * (nparams - 1))));
12533 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
12534 call_site->pc = pc;
12536 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
12537 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
12539 struct die_info *func_die;
12541 /* Skip also over DW_TAG_inlined_subroutine. */
12542 for (func_die = die->parent;
12543 func_die && func_die->tag != DW_TAG_subprogram
12544 && func_die->tag != DW_TAG_subroutine_type;
12545 func_die = func_die->parent);
12547 /* DW_AT_call_all_calls is a superset
12548 of DW_AT_call_all_tail_calls. */
12550 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
12551 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
12552 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
12553 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
12555 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
12556 not complete. But keep CALL_SITE for look ups via call_site_htab,
12557 both the initial caller containing the real return address PC and
12558 the final callee containing the current PC of a chain of tail
12559 calls do not need to have the tail call list complete. But any
12560 function candidate for a virtual tail call frame searched via
12561 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
12562 determined unambiguously. */
12566 struct type *func_type = NULL;
12569 func_type = get_die_type (func_die, cu);
12570 if (func_type != NULL)
12572 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
12574 /* Enlist this call site to the function. */
12575 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
12576 TYPE_TAIL_CALL_LIST (func_type) = call_site;
12579 complaint (&symfile_complaints,
12580 _("Cannot find function owning DW_TAG_call_site "
12581 "DIE 0x%x [in module %s]"),
12582 to_underlying (die->sect_off), objfile_name (objfile));
12586 attr = dwarf2_attr (die, DW_AT_call_target, cu);
12588 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
12590 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
12593 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
12594 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
12596 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
12597 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
12598 /* Keep NULL DWARF_BLOCK. */;
12599 else if (attr_form_is_block (attr))
12601 struct dwarf2_locexpr_baton *dlbaton;
12603 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
12604 dlbaton->data = DW_BLOCK (attr)->data;
12605 dlbaton->size = DW_BLOCK (attr)->size;
12606 dlbaton->per_cu = cu->per_cu;
12608 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
12610 else if (attr_form_is_ref (attr))
12612 struct dwarf2_cu *target_cu = cu;
12613 struct die_info *target_die;
12615 target_die = follow_die_ref (die, attr, &target_cu);
12616 gdb_assert (target_cu->objfile == objfile);
12617 if (die_is_declaration (target_die, target_cu))
12619 const char *target_physname;
12621 /* Prefer the mangled name; otherwise compute the demangled one. */
12622 target_physname = dw2_linkage_name (target_die, target_cu);
12623 if (target_physname == NULL)
12624 target_physname = dwarf2_physname (NULL, target_die, target_cu);
12625 if (target_physname == NULL)
12626 complaint (&symfile_complaints,
12627 _("DW_AT_call_target target DIE has invalid "
12628 "physname, for referencing DIE 0x%x [in module %s]"),
12629 to_underlying (die->sect_off), objfile_name (objfile));
12631 SET_FIELD_PHYSNAME (call_site->target, target_physname);
12637 /* DW_AT_entry_pc should be preferred. */
12638 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
12639 <= PC_BOUNDS_INVALID)
12640 complaint (&symfile_complaints,
12641 _("DW_AT_call_target target DIE has invalid "
12642 "low pc, for referencing DIE 0x%x [in module %s]"),
12643 to_underlying (die->sect_off), objfile_name (objfile));
12646 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
12647 SET_FIELD_PHYSADDR (call_site->target, lowpc);
12652 complaint (&symfile_complaints,
12653 _("DW_TAG_call_site DW_AT_call_target is neither "
12654 "block nor reference, for DIE 0x%x [in module %s]"),
12655 to_underlying (die->sect_off), objfile_name (objfile));
12657 call_site->per_cu = cu->per_cu;
12659 for (child_die = die->child;
12660 child_die && child_die->tag;
12661 child_die = sibling_die (child_die))
12663 struct call_site_parameter *parameter;
12664 struct attribute *loc, *origin;
12666 if (child_die->tag != DW_TAG_call_site_parameter
12667 && child_die->tag != DW_TAG_GNU_call_site_parameter)
12669 /* Already printed the complaint above. */
12673 gdb_assert (call_site->parameter_count < nparams);
12674 parameter = &call_site->parameter[call_site->parameter_count];
12676 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
12677 specifies DW_TAG_formal_parameter. Value of the data assumed for the
12678 register is contained in DW_AT_call_value. */
12680 loc = dwarf2_attr (child_die, DW_AT_location, cu);
12681 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
12682 if (origin == NULL)
12684 /* This was a pre-DWARF-5 GNU extension alias
12685 for DW_AT_call_parameter. */
12686 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
12688 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
12690 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
12692 sect_offset sect_off
12693 = (sect_offset) dwarf2_get_ref_die_offset (origin);
12694 if (!offset_in_cu_p (&cu->header, sect_off))
12696 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
12697 binding can be done only inside one CU. Such referenced DIE
12698 therefore cannot be even moved to DW_TAG_partial_unit. */
12699 complaint (&symfile_complaints,
12700 _("DW_AT_call_parameter offset is not in CU for "
12701 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12702 to_underlying (child_die->sect_off),
12703 objfile_name (objfile));
12706 parameter->u.param_cu_off
12707 = (cu_offset) (sect_off - cu->header.sect_off);
12709 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
12711 complaint (&symfile_complaints,
12712 _("No DW_FORM_block* DW_AT_location for "
12713 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12714 to_underlying (child_die->sect_off), objfile_name (objfile));
12719 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
12720 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
12721 if (parameter->u.dwarf_reg != -1)
12722 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
12723 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
12724 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
12725 ¶meter->u.fb_offset))
12726 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
12729 complaint (&symfile_complaints,
12730 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
12731 "for DW_FORM_block* DW_AT_location is supported for "
12732 "DW_TAG_call_site child DIE 0x%x "
12734 to_underlying (child_die->sect_off),
12735 objfile_name (objfile));
12740 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
12742 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
12743 if (!attr_form_is_block (attr))
12745 complaint (&symfile_complaints,
12746 _("No DW_FORM_block* DW_AT_call_value for "
12747 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12748 to_underlying (child_die->sect_off),
12749 objfile_name (objfile));
12752 parameter->value = DW_BLOCK (attr)->data;
12753 parameter->value_size = DW_BLOCK (attr)->size;
12755 /* Parameters are not pre-cleared by memset above. */
12756 parameter->data_value = NULL;
12757 parameter->data_value_size = 0;
12758 call_site->parameter_count++;
12760 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
12762 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
12765 if (!attr_form_is_block (attr))
12766 complaint (&symfile_complaints,
12767 _("No DW_FORM_block* DW_AT_call_data_value for "
12768 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12769 to_underlying (child_die->sect_off),
12770 objfile_name (objfile));
12773 parameter->data_value = DW_BLOCK (attr)->data;
12774 parameter->data_value_size = DW_BLOCK (attr)->size;
12780 /* Helper function for read_variable. If DIE represents a virtual
12781 table, then return the type of the concrete object that is
12782 associated with the virtual table. Otherwise, return NULL. */
12784 static struct type *
12785 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
12787 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
12791 /* Find the type DIE. */
12792 struct die_info *type_die = NULL;
12793 struct dwarf2_cu *type_cu = cu;
12795 if (attr_form_is_ref (attr))
12796 type_die = follow_die_ref (die, attr, &type_cu);
12797 if (type_die == NULL)
12800 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
12802 return die_containing_type (type_die, type_cu);
12805 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
12808 read_variable (struct die_info *die, struct dwarf2_cu *cu)
12810 struct rust_vtable_symbol *storage = NULL;
12812 if (cu->language == language_rust)
12814 struct type *containing_type = rust_containing_type (die, cu);
12816 if (containing_type != NULL)
12818 struct objfile *objfile = cu->objfile;
12820 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
12821 struct rust_vtable_symbol);
12822 initialize_objfile_symbol (storage);
12823 storage->concrete_type = containing_type;
12824 storage->is_rust_vtable = 1;
12828 new_symbol_full (die, NULL, cu, storage);
12831 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
12832 reading .debug_rnglists.
12833 Callback's type should be:
12834 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
12835 Return true if the attributes are present and valid, otherwise,
12838 template <typename Callback>
12840 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
12841 Callback &&callback)
12843 struct objfile *objfile = cu->objfile;
12844 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12845 struct comp_unit_head *cu_header = &cu->header;
12846 bfd *obfd = objfile->obfd;
12847 unsigned int addr_size = cu_header->addr_size;
12848 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
12849 /* Base address selection entry. */
12852 unsigned int dummy;
12853 const gdb_byte *buffer;
12855 CORE_ADDR high = 0;
12856 CORE_ADDR baseaddr;
12857 bool overflow = false;
12859 found_base = cu->base_known;
12860 base = cu->base_address;
12862 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
12863 if (offset >= dwarf2_per_objfile->rnglists.size)
12865 complaint (&symfile_complaints,
12866 _("Offset %d out of bounds for DW_AT_ranges attribute"),
12870 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
12872 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12876 /* Initialize it due to a false compiler warning. */
12877 CORE_ADDR range_beginning = 0, range_end = 0;
12878 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
12879 + dwarf2_per_objfile->rnglists.size);
12880 unsigned int bytes_read;
12882 if (buffer == buf_end)
12887 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
12890 case DW_RLE_end_of_list:
12892 case DW_RLE_base_address:
12893 if (buffer + cu->header.addr_size > buf_end)
12898 base = read_address (obfd, buffer, cu, &bytes_read);
12900 buffer += bytes_read;
12902 case DW_RLE_start_length:
12903 if (buffer + cu->header.addr_size > buf_end)
12908 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12909 buffer += bytes_read;
12910 range_end = (range_beginning
12911 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
12912 buffer += bytes_read;
12913 if (buffer > buf_end)
12919 case DW_RLE_offset_pair:
12920 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12921 buffer += bytes_read;
12922 if (buffer > buf_end)
12927 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
12928 buffer += bytes_read;
12929 if (buffer > buf_end)
12935 case DW_RLE_start_end:
12936 if (buffer + 2 * cu->header.addr_size > buf_end)
12941 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
12942 buffer += bytes_read;
12943 range_end = read_address (obfd, buffer, cu, &bytes_read);
12944 buffer += bytes_read;
12947 complaint (&symfile_complaints,
12948 _("Invalid .debug_rnglists data (no base address)"));
12951 if (rlet == DW_RLE_end_of_list || overflow)
12953 if (rlet == DW_RLE_base_address)
12958 /* We have no valid base address for the ranges
12960 complaint (&symfile_complaints,
12961 _("Invalid .debug_rnglists data (no base address)"));
12965 if (range_beginning > range_end)
12967 /* Inverted range entries are invalid. */
12968 complaint (&symfile_complaints,
12969 _("Invalid .debug_rnglists data (inverted range)"));
12973 /* Empty range entries have no effect. */
12974 if (range_beginning == range_end)
12977 range_beginning += base;
12980 /* A not-uncommon case of bad debug info.
12981 Don't pollute the addrmap with bad data. */
12982 if (range_beginning + baseaddr == 0
12983 && !dwarf2_per_objfile->has_section_at_zero)
12985 complaint (&symfile_complaints,
12986 _(".debug_rnglists entry has start address of zero"
12987 " [in module %s]"), objfile_name (objfile));
12991 callback (range_beginning, range_end);
12996 complaint (&symfile_complaints,
12997 _("Offset %d is not terminated "
12998 "for DW_AT_ranges attribute"),
13006 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
13007 Callback's type should be:
13008 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
13009 Return 1 if the attributes are present and valid, otherwise, return 0. */
13011 template <typename Callback>
13013 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
13014 Callback &&callback)
13016 struct objfile *objfile = cu->objfile;
13017 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13018 struct comp_unit_head *cu_header = &cu->header;
13019 bfd *obfd = objfile->obfd;
13020 unsigned int addr_size = cu_header->addr_size;
13021 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
13022 /* Base address selection entry. */
13025 unsigned int dummy;
13026 const gdb_byte *buffer;
13027 CORE_ADDR baseaddr;
13029 if (cu_header->version >= 5)
13030 return dwarf2_rnglists_process (offset, cu, callback);
13032 found_base = cu->base_known;
13033 base = cu->base_address;
13035 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
13036 if (offset >= dwarf2_per_objfile->ranges.size)
13038 complaint (&symfile_complaints,
13039 _("Offset %d out of bounds for DW_AT_ranges attribute"),
13043 buffer = dwarf2_per_objfile->ranges.buffer + offset;
13045 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13049 CORE_ADDR range_beginning, range_end;
13051 range_beginning = read_address (obfd, buffer, cu, &dummy);
13052 buffer += addr_size;
13053 range_end = read_address (obfd, buffer, cu, &dummy);
13054 buffer += addr_size;
13055 offset += 2 * addr_size;
13057 /* An end of list marker is a pair of zero addresses. */
13058 if (range_beginning == 0 && range_end == 0)
13059 /* Found the end of list entry. */
13062 /* Each base address selection entry is a pair of 2 values.
13063 The first is the largest possible address, the second is
13064 the base address. Check for a base address here. */
13065 if ((range_beginning & mask) == mask)
13067 /* If we found the largest possible address, then we already
13068 have the base address in range_end. */
13076 /* We have no valid base address for the ranges
13078 complaint (&symfile_complaints,
13079 _("Invalid .debug_ranges data (no base address)"));
13083 if (range_beginning > range_end)
13085 /* Inverted range entries are invalid. */
13086 complaint (&symfile_complaints,
13087 _("Invalid .debug_ranges data (inverted range)"));
13091 /* Empty range entries have no effect. */
13092 if (range_beginning == range_end)
13095 range_beginning += base;
13098 /* A not-uncommon case of bad debug info.
13099 Don't pollute the addrmap with bad data. */
13100 if (range_beginning + baseaddr == 0
13101 && !dwarf2_per_objfile->has_section_at_zero)
13103 complaint (&symfile_complaints,
13104 _(".debug_ranges entry has start address of zero"
13105 " [in module %s]"), objfile_name (objfile));
13109 callback (range_beginning, range_end);
13115 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
13116 Return 1 if the attributes are present and valid, otherwise, return 0.
13117 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
13120 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
13121 CORE_ADDR *high_return, struct dwarf2_cu *cu,
13122 struct partial_symtab *ranges_pst)
13124 struct objfile *objfile = cu->objfile;
13125 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13126 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
13127 SECT_OFF_TEXT (objfile));
13130 CORE_ADDR high = 0;
13133 retval = dwarf2_ranges_process (offset, cu,
13134 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
13136 if (ranges_pst != NULL)
13141 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
13142 range_beginning + baseaddr);
13143 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
13144 range_end + baseaddr);
13145 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
13149 /* FIXME: This is recording everything as a low-high
13150 segment of consecutive addresses. We should have a
13151 data structure for discontiguous block ranges
13155 low = range_beginning;
13161 if (range_beginning < low)
13162 low = range_beginning;
13163 if (range_end > high)
13171 /* If the first entry is an end-of-list marker, the range
13172 describes an empty scope, i.e. no instructions. */
13178 *high_return = high;
13182 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
13183 definition for the return value. *LOWPC and *HIGHPC are set iff
13184 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
13186 static enum pc_bounds_kind
13187 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
13188 CORE_ADDR *highpc, struct dwarf2_cu *cu,
13189 struct partial_symtab *pst)
13191 struct attribute *attr;
13192 struct attribute *attr_high;
13194 CORE_ADDR high = 0;
13195 enum pc_bounds_kind ret;
13197 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
13200 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13203 low = attr_value_as_address (attr);
13204 high = attr_value_as_address (attr_high);
13205 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
13209 /* Found high w/o low attribute. */
13210 return PC_BOUNDS_INVALID;
13212 /* Found consecutive range of addresses. */
13213 ret = PC_BOUNDS_HIGH_LOW;
13217 attr = dwarf2_attr (die, DW_AT_ranges, cu);
13220 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
13221 We take advantage of the fact that DW_AT_ranges does not appear
13222 in DW_TAG_compile_unit of DWO files. */
13223 int need_ranges_base = die->tag != DW_TAG_compile_unit;
13224 unsigned int ranges_offset = (DW_UNSND (attr)
13225 + (need_ranges_base
13229 /* Value of the DW_AT_ranges attribute is the offset in the
13230 .debug_ranges section. */
13231 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
13232 return PC_BOUNDS_INVALID;
13233 /* Found discontinuous range of addresses. */
13234 ret = PC_BOUNDS_RANGES;
13237 return PC_BOUNDS_NOT_PRESENT;
13240 /* read_partial_die has also the strict LOW < HIGH requirement. */
13242 return PC_BOUNDS_INVALID;
13244 /* When using the GNU linker, .gnu.linkonce. sections are used to
13245 eliminate duplicate copies of functions and vtables and such.
13246 The linker will arbitrarily choose one and discard the others.
13247 The AT_*_pc values for such functions refer to local labels in
13248 these sections. If the section from that file was discarded, the
13249 labels are not in the output, so the relocs get a value of 0.
13250 If this is a discarded function, mark the pc bounds as invalid,
13251 so that GDB will ignore it. */
13252 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
13253 return PC_BOUNDS_INVALID;
13261 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
13262 its low and high PC addresses. Do nothing if these addresses could not
13263 be determined. Otherwise, set LOWPC to the low address if it is smaller,
13264 and HIGHPC to the high address if greater than HIGHPC. */
13267 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
13268 CORE_ADDR *lowpc, CORE_ADDR *highpc,
13269 struct dwarf2_cu *cu)
13271 CORE_ADDR low, high;
13272 struct die_info *child = die->child;
13274 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
13276 *lowpc = std::min (*lowpc, low);
13277 *highpc = std::max (*highpc, high);
13280 /* If the language does not allow nested subprograms (either inside
13281 subprograms or lexical blocks), we're done. */
13282 if (cu->language != language_ada)
13285 /* Check all the children of the given DIE. If it contains nested
13286 subprograms, then check their pc bounds. Likewise, we need to
13287 check lexical blocks as well, as they may also contain subprogram
13289 while (child && child->tag)
13291 if (child->tag == DW_TAG_subprogram
13292 || child->tag == DW_TAG_lexical_block)
13293 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
13294 child = sibling_die (child);
13298 /* Get the low and high pc's represented by the scope DIE, and store
13299 them in *LOWPC and *HIGHPC. If the correct values can't be
13300 determined, set *LOWPC to -1 and *HIGHPC to 0. */
13303 get_scope_pc_bounds (struct die_info *die,
13304 CORE_ADDR *lowpc, CORE_ADDR *highpc,
13305 struct dwarf2_cu *cu)
13307 CORE_ADDR best_low = (CORE_ADDR) -1;
13308 CORE_ADDR best_high = (CORE_ADDR) 0;
13309 CORE_ADDR current_low, current_high;
13311 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
13312 >= PC_BOUNDS_RANGES)
13314 best_low = current_low;
13315 best_high = current_high;
13319 struct die_info *child = die->child;
13321 while (child && child->tag)
13323 switch (child->tag) {
13324 case DW_TAG_subprogram:
13325 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
13327 case DW_TAG_namespace:
13328 case DW_TAG_module:
13329 /* FIXME: carlton/2004-01-16: Should we do this for
13330 DW_TAG_class_type/DW_TAG_structure_type, too? I think
13331 that current GCC's always emit the DIEs corresponding
13332 to definitions of methods of classes as children of a
13333 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
13334 the DIEs giving the declarations, which could be
13335 anywhere). But I don't see any reason why the
13336 standards says that they have to be there. */
13337 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
13339 if (current_low != ((CORE_ADDR) -1))
13341 best_low = std::min (best_low, current_low);
13342 best_high = std::max (best_high, current_high);
13350 child = sibling_die (child);
13355 *highpc = best_high;
13358 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
13362 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
13363 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
13365 struct objfile *objfile = cu->objfile;
13366 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13367 struct attribute *attr;
13368 struct attribute *attr_high;
13370 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
13373 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13376 CORE_ADDR low = attr_value_as_address (attr);
13377 CORE_ADDR high = attr_value_as_address (attr_high);
13379 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
13382 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
13383 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
13384 record_block_range (block, low, high - 1);
13388 attr = dwarf2_attr (die, DW_AT_ranges, cu);
13391 bfd *obfd = objfile->obfd;
13392 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
13393 We take advantage of the fact that DW_AT_ranges does not appear
13394 in DW_TAG_compile_unit of DWO files. */
13395 int need_ranges_base = die->tag != DW_TAG_compile_unit;
13397 /* The value of the DW_AT_ranges attribute is the offset of the
13398 address range list in the .debug_ranges section. */
13399 unsigned long offset = (DW_UNSND (attr)
13400 + (need_ranges_base ? cu->ranges_base : 0));
13401 const gdb_byte *buffer;
13403 /* For some target architectures, but not others, the
13404 read_address function sign-extends the addresses it returns.
13405 To recognize base address selection entries, we need a
13407 unsigned int addr_size = cu->header.addr_size;
13408 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
13410 /* The base address, to which the next pair is relative. Note
13411 that this 'base' is a DWARF concept: most entries in a range
13412 list are relative, to reduce the number of relocs against the
13413 debugging information. This is separate from this function's
13414 'baseaddr' argument, which GDB uses to relocate debugging
13415 information from a shared library based on the address at
13416 which the library was loaded. */
13417 CORE_ADDR base = cu->base_address;
13418 int base_known = cu->base_known;
13420 dwarf2_ranges_process (offset, cu,
13421 [&] (CORE_ADDR start, CORE_ADDR end)
13425 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
13426 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
13427 record_block_range (block, start, end - 1);
13432 /* Check whether the producer field indicates either of GCC < 4.6, or the
13433 Intel C/C++ compiler, and cache the result in CU. */
13436 check_producer (struct dwarf2_cu *cu)
13440 if (cu->producer == NULL)
13442 /* For unknown compilers expect their behavior is DWARF version
13445 GCC started to support .debug_types sections by -gdwarf-4 since
13446 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
13447 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
13448 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
13449 interpreted incorrectly by GDB now - GCC PR debug/48229. */
13451 else if (producer_is_gcc (cu->producer, &major, &minor))
13453 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
13454 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
13456 else if (producer_is_icc (cu->producer, &major, &minor))
13457 cu->producer_is_icc_lt_14 = major < 14;
13460 /* For other non-GCC compilers, expect their behavior is DWARF version
13464 cu->checked_producer = 1;
13467 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
13468 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
13469 during 4.6.0 experimental. */
13472 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
13474 if (!cu->checked_producer)
13475 check_producer (cu);
13477 return cu->producer_is_gxx_lt_4_6;
13480 /* Return the default accessibility type if it is not overriden by
13481 DW_AT_accessibility. */
13483 static enum dwarf_access_attribute
13484 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
13486 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
13488 /* The default DWARF 2 accessibility for members is public, the default
13489 accessibility for inheritance is private. */
13491 if (die->tag != DW_TAG_inheritance)
13492 return DW_ACCESS_public;
13494 return DW_ACCESS_private;
13498 /* DWARF 3+ defines the default accessibility a different way. The same
13499 rules apply now for DW_TAG_inheritance as for the members and it only
13500 depends on the container kind. */
13502 if (die->parent->tag == DW_TAG_class_type)
13503 return DW_ACCESS_private;
13505 return DW_ACCESS_public;
13509 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
13510 offset. If the attribute was not found return 0, otherwise return
13511 1. If it was found but could not properly be handled, set *OFFSET
13515 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
13518 struct attribute *attr;
13520 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
13525 /* Note that we do not check for a section offset first here.
13526 This is because DW_AT_data_member_location is new in DWARF 4,
13527 so if we see it, we can assume that a constant form is really
13528 a constant and not a section offset. */
13529 if (attr_form_is_constant (attr))
13530 *offset = dwarf2_get_attr_constant_value (attr, 0);
13531 else if (attr_form_is_section_offset (attr))
13532 dwarf2_complex_location_expr_complaint ();
13533 else if (attr_form_is_block (attr))
13534 *offset = decode_locdesc (DW_BLOCK (attr), cu);
13536 dwarf2_complex_location_expr_complaint ();
13544 /* Add an aggregate field to the field list. */
13547 dwarf2_add_field (struct field_info *fip, struct die_info *die,
13548 struct dwarf2_cu *cu)
13550 struct objfile *objfile = cu->objfile;
13551 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13552 struct nextfield *new_field;
13553 struct attribute *attr;
13555 const char *fieldname = "";
13557 /* Allocate a new field list entry and link it in. */
13558 new_field = XNEW (struct nextfield);
13559 make_cleanup (xfree, new_field);
13560 memset (new_field, 0, sizeof (struct nextfield));
13562 if (die->tag == DW_TAG_inheritance)
13564 new_field->next = fip->baseclasses;
13565 fip->baseclasses = new_field;
13569 new_field->next = fip->fields;
13570 fip->fields = new_field;
13574 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
13576 new_field->accessibility = DW_UNSND (attr);
13578 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
13579 if (new_field->accessibility != DW_ACCESS_public)
13580 fip->non_public_fields = 1;
13582 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
13584 new_field->virtuality = DW_UNSND (attr);
13586 new_field->virtuality = DW_VIRTUALITY_none;
13588 fp = &new_field->field;
13590 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
13594 /* Data member other than a C++ static data member. */
13596 /* Get type of field. */
13597 fp->type = die_type (die, cu);
13599 SET_FIELD_BITPOS (*fp, 0);
13601 /* Get bit size of field (zero if none). */
13602 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
13605 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
13609 FIELD_BITSIZE (*fp) = 0;
13612 /* Get bit offset of field. */
13613 if (handle_data_member_location (die, cu, &offset))
13614 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
13615 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
13618 if (gdbarch_bits_big_endian (gdbarch))
13620 /* For big endian bits, the DW_AT_bit_offset gives the
13621 additional bit offset from the MSB of the containing
13622 anonymous object to the MSB of the field. We don't
13623 have to do anything special since we don't need to
13624 know the size of the anonymous object. */
13625 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
13629 /* For little endian bits, compute the bit offset to the
13630 MSB of the anonymous object, subtract off the number of
13631 bits from the MSB of the field to the MSB of the
13632 object, and then subtract off the number of bits of
13633 the field itself. The result is the bit offset of
13634 the LSB of the field. */
13635 int anonymous_size;
13636 int bit_offset = DW_UNSND (attr);
13638 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13641 /* The size of the anonymous object containing
13642 the bit field is explicit, so use the
13643 indicated size (in bytes). */
13644 anonymous_size = DW_UNSND (attr);
13648 /* The size of the anonymous object containing
13649 the bit field must be inferred from the type
13650 attribute of the data member containing the
13652 anonymous_size = TYPE_LENGTH (fp->type);
13654 SET_FIELD_BITPOS (*fp,
13655 (FIELD_BITPOS (*fp)
13656 + anonymous_size * bits_per_byte
13657 - bit_offset - FIELD_BITSIZE (*fp)));
13660 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
13662 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
13663 + dwarf2_get_attr_constant_value (attr, 0)));
13665 /* Get name of field. */
13666 fieldname = dwarf2_name (die, cu);
13667 if (fieldname == NULL)
13670 /* The name is already allocated along with this objfile, so we don't
13671 need to duplicate it for the type. */
13672 fp->name = fieldname;
13674 /* Change accessibility for artificial fields (e.g. virtual table
13675 pointer or virtual base class pointer) to private. */
13676 if (dwarf2_attr (die, DW_AT_artificial, cu))
13678 FIELD_ARTIFICIAL (*fp) = 1;
13679 new_field->accessibility = DW_ACCESS_private;
13680 fip->non_public_fields = 1;
13683 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
13685 /* C++ static member. */
13687 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
13688 is a declaration, but all versions of G++ as of this writing
13689 (so through at least 3.2.1) incorrectly generate
13690 DW_TAG_variable tags. */
13692 const char *physname;
13694 /* Get name of field. */
13695 fieldname = dwarf2_name (die, cu);
13696 if (fieldname == NULL)
13699 attr = dwarf2_attr (die, DW_AT_const_value, cu);
13701 /* Only create a symbol if this is an external value.
13702 new_symbol checks this and puts the value in the global symbol
13703 table, which we want. If it is not external, new_symbol
13704 will try to put the value in cu->list_in_scope which is wrong. */
13705 && dwarf2_flag_true_p (die, DW_AT_external, cu))
13707 /* A static const member, not much different than an enum as far as
13708 we're concerned, except that we can support more types. */
13709 new_symbol (die, NULL, cu);
13712 /* Get physical name. */
13713 physname = dwarf2_physname (fieldname, die, cu);
13715 /* The name is already allocated along with this objfile, so we don't
13716 need to duplicate it for the type. */
13717 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
13718 FIELD_TYPE (*fp) = die_type (die, cu);
13719 FIELD_NAME (*fp) = fieldname;
13721 else if (die->tag == DW_TAG_inheritance)
13725 /* C++ base class field. */
13726 if (handle_data_member_location (die, cu, &offset))
13727 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
13728 FIELD_BITSIZE (*fp) = 0;
13729 FIELD_TYPE (*fp) = die_type (die, cu);
13730 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
13731 fip->nbaseclasses++;
13735 /* Add a typedef defined in the scope of the FIP's class. */
13738 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
13739 struct dwarf2_cu *cu)
13741 struct typedef_field_list *new_field;
13742 struct typedef_field *fp;
13744 /* Allocate a new field list entry and link it in. */
13745 new_field = XCNEW (struct typedef_field_list);
13746 make_cleanup (xfree, new_field);
13748 gdb_assert (die->tag == DW_TAG_typedef);
13750 fp = &new_field->field;
13752 /* Get name of field. */
13753 fp->name = dwarf2_name (die, cu);
13754 if (fp->name == NULL)
13757 fp->type = read_type_die (die, cu);
13759 /* Save accessibility. */
13760 enum dwarf_access_attribute accessibility;
13761 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
13763 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
13765 accessibility = dwarf2_default_access_attribute (die, cu);
13766 switch (accessibility)
13768 case DW_ACCESS_public:
13769 /* The assumed value if neither private nor protected. */
13771 case DW_ACCESS_private:
13772 fp->is_private = 1;
13774 case DW_ACCESS_protected:
13775 fp->is_protected = 1;
13778 complaint (&symfile_complaints,
13779 _("Unhandled DW_AT_accessibility value (%x)"), accessibility);
13782 new_field->next = fip->typedef_field_list;
13783 fip->typedef_field_list = new_field;
13784 fip->typedef_field_list_count++;
13787 /* Create the vector of fields, and attach it to the type. */
13790 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
13791 struct dwarf2_cu *cu)
13793 int nfields = fip->nfields;
13795 /* Record the field count, allocate space for the array of fields,
13796 and create blank accessibility bitfields if necessary. */
13797 TYPE_NFIELDS (type) = nfields;
13798 TYPE_FIELDS (type) = (struct field *)
13799 TYPE_ALLOC (type, sizeof (struct field) * nfields);
13800 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
13802 if (fip->non_public_fields && cu->language != language_ada)
13804 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13806 TYPE_FIELD_PRIVATE_BITS (type) =
13807 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13808 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
13810 TYPE_FIELD_PROTECTED_BITS (type) =
13811 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13812 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
13814 TYPE_FIELD_IGNORE_BITS (type) =
13815 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
13816 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
13819 /* If the type has baseclasses, allocate and clear a bit vector for
13820 TYPE_FIELD_VIRTUAL_BITS. */
13821 if (fip->nbaseclasses && cu->language != language_ada)
13823 int num_bytes = B_BYTES (fip->nbaseclasses);
13824 unsigned char *pointer;
13826 ALLOCATE_CPLUS_STRUCT_TYPE (type);
13827 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
13828 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
13829 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
13830 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
13833 /* Copy the saved-up fields into the field vector. Start from the head of
13834 the list, adding to the tail of the field array, so that they end up in
13835 the same order in the array in which they were added to the list. */
13836 while (nfields-- > 0)
13838 struct nextfield *fieldp;
13842 fieldp = fip->fields;
13843 fip->fields = fieldp->next;
13847 fieldp = fip->baseclasses;
13848 fip->baseclasses = fieldp->next;
13851 TYPE_FIELD (type, nfields) = fieldp->field;
13852 switch (fieldp->accessibility)
13854 case DW_ACCESS_private:
13855 if (cu->language != language_ada)
13856 SET_TYPE_FIELD_PRIVATE (type, nfields);
13859 case DW_ACCESS_protected:
13860 if (cu->language != language_ada)
13861 SET_TYPE_FIELD_PROTECTED (type, nfields);
13864 case DW_ACCESS_public:
13868 /* Unknown accessibility. Complain and treat it as public. */
13870 complaint (&symfile_complaints, _("unsupported accessibility %d"),
13871 fieldp->accessibility);
13875 if (nfields < fip->nbaseclasses)
13877 switch (fieldp->virtuality)
13879 case DW_VIRTUALITY_virtual:
13880 case DW_VIRTUALITY_pure_virtual:
13881 if (cu->language == language_ada)
13882 error (_("unexpected virtuality in component of Ada type"));
13883 SET_TYPE_FIELD_VIRTUAL (type, nfields);
13890 /* Return true if this member function is a constructor, false
13894 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
13896 const char *fieldname;
13897 const char *type_name;
13900 if (die->parent == NULL)
13903 if (die->parent->tag != DW_TAG_structure_type
13904 && die->parent->tag != DW_TAG_union_type
13905 && die->parent->tag != DW_TAG_class_type)
13908 fieldname = dwarf2_name (die, cu);
13909 type_name = dwarf2_name (die->parent, cu);
13910 if (fieldname == NULL || type_name == NULL)
13913 len = strlen (fieldname);
13914 return (strncmp (fieldname, type_name, len) == 0
13915 && (type_name[len] == '\0' || type_name[len] == '<'));
13918 /* Add a member function to the proper fieldlist. */
13921 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
13922 struct type *type, struct dwarf2_cu *cu)
13924 struct objfile *objfile = cu->objfile;
13925 struct attribute *attr;
13926 struct fnfieldlist *flp;
13928 struct fn_field *fnp;
13929 const char *fieldname;
13930 struct nextfnfield *new_fnfield;
13931 struct type *this_type;
13932 enum dwarf_access_attribute accessibility;
13934 if (cu->language == language_ada)
13935 error (_("unexpected member function in Ada type"));
13937 /* Get name of member function. */
13938 fieldname = dwarf2_name (die, cu);
13939 if (fieldname == NULL)
13942 /* Look up member function name in fieldlist. */
13943 for (i = 0; i < fip->nfnfields; i++)
13945 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
13949 /* Create new list element if necessary. */
13950 if (i < fip->nfnfields)
13951 flp = &fip->fnfieldlists[i];
13954 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
13956 fip->fnfieldlists = (struct fnfieldlist *)
13957 xrealloc (fip->fnfieldlists,
13958 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
13959 * sizeof (struct fnfieldlist));
13960 if (fip->nfnfields == 0)
13961 make_cleanup (free_current_contents, &fip->fnfieldlists);
13963 flp = &fip->fnfieldlists[fip->nfnfields];
13964 flp->name = fieldname;
13967 i = fip->nfnfields++;
13970 /* Create a new member function field and chain it to the field list
13972 new_fnfield = XNEW (struct nextfnfield);
13973 make_cleanup (xfree, new_fnfield);
13974 memset (new_fnfield, 0, sizeof (struct nextfnfield));
13975 new_fnfield->next = flp->head;
13976 flp->head = new_fnfield;
13979 /* Fill in the member function field info. */
13980 fnp = &new_fnfield->fnfield;
13982 /* Delay processing of the physname until later. */
13983 if (cu->language == language_cplus)
13985 add_to_method_list (type, i, flp->length - 1, fieldname,
13990 const char *physname = dwarf2_physname (fieldname, die, cu);
13991 fnp->physname = physname ? physname : "";
13994 fnp->type = alloc_type (objfile);
13995 this_type = read_type_die (die, cu);
13996 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
13998 int nparams = TYPE_NFIELDS (this_type);
14000 /* TYPE is the domain of this method, and THIS_TYPE is the type
14001 of the method itself (TYPE_CODE_METHOD). */
14002 smash_to_method_type (fnp->type, type,
14003 TYPE_TARGET_TYPE (this_type),
14004 TYPE_FIELDS (this_type),
14005 TYPE_NFIELDS (this_type),
14006 TYPE_VARARGS (this_type));
14008 /* Handle static member functions.
14009 Dwarf2 has no clean way to discern C++ static and non-static
14010 member functions. G++ helps GDB by marking the first
14011 parameter for non-static member functions (which is the this
14012 pointer) as artificial. We obtain this information from
14013 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
14014 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
14015 fnp->voffset = VOFFSET_STATIC;
14018 complaint (&symfile_complaints, _("member function type missing for '%s'"),
14019 dwarf2_full_name (fieldname, die, cu));
14021 /* Get fcontext from DW_AT_containing_type if present. */
14022 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
14023 fnp->fcontext = die_containing_type (die, cu);
14025 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
14026 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
14028 /* Get accessibility. */
14029 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
14031 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
14033 accessibility = dwarf2_default_access_attribute (die, cu);
14034 switch (accessibility)
14036 case DW_ACCESS_private:
14037 fnp->is_private = 1;
14039 case DW_ACCESS_protected:
14040 fnp->is_protected = 1;
14044 /* Check for artificial methods. */
14045 attr = dwarf2_attr (die, DW_AT_artificial, cu);
14046 if (attr && DW_UNSND (attr) != 0)
14047 fnp->is_artificial = 1;
14049 fnp->is_constructor = dwarf2_is_constructor (die, cu);
14051 /* Get index in virtual function table if it is a virtual member
14052 function. For older versions of GCC, this is an offset in the
14053 appropriate virtual table, as specified by DW_AT_containing_type.
14054 For everyone else, it is an expression to be evaluated relative
14055 to the object address. */
14057 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
14060 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
14062 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
14064 /* Old-style GCC. */
14065 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
14067 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
14068 || (DW_BLOCK (attr)->size > 1
14069 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
14070 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
14072 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
14073 if ((fnp->voffset % cu->header.addr_size) != 0)
14074 dwarf2_complex_location_expr_complaint ();
14076 fnp->voffset /= cu->header.addr_size;
14080 dwarf2_complex_location_expr_complaint ();
14082 if (!fnp->fcontext)
14084 /* If there is no `this' field and no DW_AT_containing_type,
14085 we cannot actually find a base class context for the
14087 if (TYPE_NFIELDS (this_type) == 0
14088 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
14090 complaint (&symfile_complaints,
14091 _("cannot determine context for virtual member "
14092 "function \"%s\" (offset %d)"),
14093 fieldname, to_underlying (die->sect_off));
14098 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
14102 else if (attr_form_is_section_offset (attr))
14104 dwarf2_complex_location_expr_complaint ();
14108 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
14114 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
14115 if (attr && DW_UNSND (attr))
14117 /* GCC does this, as of 2008-08-25; PR debug/37237. */
14118 complaint (&symfile_complaints,
14119 _("Member function \"%s\" (offset %d) is virtual "
14120 "but the vtable offset is not specified"),
14121 fieldname, to_underlying (die->sect_off));
14122 ALLOCATE_CPLUS_STRUCT_TYPE (type);
14123 TYPE_CPLUS_DYNAMIC (type) = 1;
14128 /* Create the vector of member function fields, and attach it to the type. */
14131 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
14132 struct dwarf2_cu *cu)
14134 struct fnfieldlist *flp;
14137 if (cu->language == language_ada)
14138 error (_("unexpected member functions in Ada type"));
14140 ALLOCATE_CPLUS_STRUCT_TYPE (type);
14141 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
14142 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
14144 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
14146 struct nextfnfield *nfp = flp->head;
14147 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
14150 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
14151 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
14152 fn_flp->fn_fields = (struct fn_field *)
14153 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
14154 for (k = flp->length; (k--, nfp); nfp = nfp->next)
14155 fn_flp->fn_fields[k] = nfp->fnfield;
14158 TYPE_NFN_FIELDS (type) = fip->nfnfields;
14161 /* Returns non-zero if NAME is the name of a vtable member in CU's
14162 language, zero otherwise. */
14164 is_vtable_name (const char *name, struct dwarf2_cu *cu)
14166 static const char vptr[] = "_vptr";
14167 static const char vtable[] = "vtable";
14169 /* Look for the C++ form of the vtable. */
14170 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
14176 /* GCC outputs unnamed structures that are really pointers to member
14177 functions, with the ABI-specified layout. If TYPE describes
14178 such a structure, smash it into a member function type.
14180 GCC shouldn't do this; it should just output pointer to member DIEs.
14181 This is GCC PR debug/28767. */
14184 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
14186 struct type *pfn_type, *self_type, *new_type;
14188 /* Check for a structure with no name and two children. */
14189 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
14192 /* Check for __pfn and __delta members. */
14193 if (TYPE_FIELD_NAME (type, 0) == NULL
14194 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
14195 || TYPE_FIELD_NAME (type, 1) == NULL
14196 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
14199 /* Find the type of the method. */
14200 pfn_type = TYPE_FIELD_TYPE (type, 0);
14201 if (pfn_type == NULL
14202 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
14203 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
14206 /* Look for the "this" argument. */
14207 pfn_type = TYPE_TARGET_TYPE (pfn_type);
14208 if (TYPE_NFIELDS (pfn_type) == 0
14209 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
14210 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
14213 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
14214 new_type = alloc_type (objfile);
14215 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
14216 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
14217 TYPE_VARARGS (pfn_type));
14218 smash_to_methodptr_type (type, new_type);
14222 /* Called when we find the DIE that starts a structure or union scope
14223 (definition) to create a type for the structure or union. Fill in
14224 the type's name and general properties; the members will not be
14225 processed until process_structure_scope. A symbol table entry for
14226 the type will also not be done until process_structure_scope (assuming
14227 the type has a name).
14229 NOTE: we need to call these functions regardless of whether or not the
14230 DIE has a DW_AT_name attribute, since it might be an anonymous
14231 structure or union. This gets the type entered into our set of
14232 user defined types. */
14234 static struct type *
14235 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
14237 struct objfile *objfile = cu->objfile;
14239 struct attribute *attr;
14242 /* If the definition of this type lives in .debug_types, read that type.
14243 Don't follow DW_AT_specification though, that will take us back up
14244 the chain and we want to go down. */
14245 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
14248 type = get_DW_AT_signature_type (die, attr, cu);
14250 /* The type's CU may not be the same as CU.
14251 Ensure TYPE is recorded with CU in die_type_hash. */
14252 return set_die_type (die, type, cu);
14255 type = alloc_type (objfile);
14256 INIT_CPLUS_SPECIFIC (type);
14258 name = dwarf2_name (die, cu);
14261 if (cu->language == language_cplus
14262 || cu->language == language_d
14263 || cu->language == language_rust)
14265 const char *full_name = dwarf2_full_name (name, die, cu);
14267 /* dwarf2_full_name might have already finished building the DIE's
14268 type. If so, there is no need to continue. */
14269 if (get_die_type (die, cu) != NULL)
14270 return get_die_type (die, cu);
14272 TYPE_TAG_NAME (type) = full_name;
14273 if (die->tag == DW_TAG_structure_type
14274 || die->tag == DW_TAG_class_type)
14275 TYPE_NAME (type) = TYPE_TAG_NAME (type);
14279 /* The name is already allocated along with this objfile, so
14280 we don't need to duplicate it for the type. */
14281 TYPE_TAG_NAME (type) = name;
14282 if (die->tag == DW_TAG_class_type)
14283 TYPE_NAME (type) = TYPE_TAG_NAME (type);
14287 if (die->tag == DW_TAG_structure_type)
14289 TYPE_CODE (type) = TYPE_CODE_STRUCT;
14291 else if (die->tag == DW_TAG_union_type)
14293 TYPE_CODE (type) = TYPE_CODE_UNION;
14297 TYPE_CODE (type) = TYPE_CODE_STRUCT;
14300 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
14301 TYPE_DECLARED_CLASS (type) = 1;
14303 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14306 if (attr_form_is_constant (attr))
14307 TYPE_LENGTH (type) = DW_UNSND (attr);
14310 /* For the moment, dynamic type sizes are not supported
14311 by GDB's struct type. The actual size is determined
14312 on-demand when resolving the type of a given object,
14313 so set the type's length to zero for now. Otherwise,
14314 we record an expression as the length, and that expression
14315 could lead to a very large value, which could eventually
14316 lead to us trying to allocate that much memory when creating
14317 a value of that type. */
14318 TYPE_LENGTH (type) = 0;
14323 TYPE_LENGTH (type) = 0;
14326 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
14328 /* ICC<14 does not output the required DW_AT_declaration on
14329 incomplete types, but gives them a size of zero. */
14330 TYPE_STUB (type) = 1;
14333 TYPE_STUB_SUPPORTED (type) = 1;
14335 if (die_is_declaration (die, cu))
14336 TYPE_STUB (type) = 1;
14337 else if (attr == NULL && die->child == NULL
14338 && producer_is_realview (cu->producer))
14339 /* RealView does not output the required DW_AT_declaration
14340 on incomplete types. */
14341 TYPE_STUB (type) = 1;
14343 /* We need to add the type field to the die immediately so we don't
14344 infinitely recurse when dealing with pointers to the structure
14345 type within the structure itself. */
14346 set_die_type (die, type, cu);
14348 /* set_die_type should be already done. */
14349 set_descriptive_type (type, die, cu);
14354 /* Finish creating a structure or union type, including filling in
14355 its members and creating a symbol for it. */
14358 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
14360 struct objfile *objfile = cu->objfile;
14361 struct die_info *child_die;
14364 type = get_die_type (die, cu);
14366 type = read_structure_type (die, cu);
14368 if (die->child != NULL && ! die_is_declaration (die, cu))
14370 struct field_info fi;
14371 std::vector<struct symbol *> template_args;
14372 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
14374 memset (&fi, 0, sizeof (struct field_info));
14376 child_die = die->child;
14378 while (child_die && child_die->tag)
14380 if (child_die->tag == DW_TAG_member
14381 || child_die->tag == DW_TAG_variable)
14383 /* NOTE: carlton/2002-11-05: A C++ static data member
14384 should be a DW_TAG_member that is a declaration, but
14385 all versions of G++ as of this writing (so through at
14386 least 3.2.1) incorrectly generate DW_TAG_variable
14387 tags for them instead. */
14388 dwarf2_add_field (&fi, child_die, cu);
14390 else if (child_die->tag == DW_TAG_subprogram)
14392 /* Rust doesn't have member functions in the C++ sense.
14393 However, it does emit ordinary functions as children
14394 of a struct DIE. */
14395 if (cu->language == language_rust)
14396 read_func_scope (child_die, cu);
14399 /* C++ member function. */
14400 dwarf2_add_member_fn (&fi, child_die, type, cu);
14403 else if (child_die->tag == DW_TAG_inheritance)
14405 /* C++ base class field. */
14406 dwarf2_add_field (&fi, child_die, cu);
14408 else if (child_die->tag == DW_TAG_typedef)
14409 dwarf2_add_typedef (&fi, child_die, cu);
14410 else if (child_die->tag == DW_TAG_template_type_param
14411 || child_die->tag == DW_TAG_template_value_param)
14413 struct symbol *arg = new_symbol (child_die, NULL, cu);
14416 template_args.push_back (arg);
14419 child_die = sibling_die (child_die);
14422 /* Attach template arguments to type. */
14423 if (!template_args.empty ())
14425 ALLOCATE_CPLUS_STRUCT_TYPE (type);
14426 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
14427 TYPE_TEMPLATE_ARGUMENTS (type)
14428 = XOBNEWVEC (&objfile->objfile_obstack,
14430 TYPE_N_TEMPLATE_ARGUMENTS (type));
14431 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
14432 template_args.data (),
14433 (TYPE_N_TEMPLATE_ARGUMENTS (type)
14434 * sizeof (struct symbol *)));
14437 /* Attach fields and member functions to the type. */
14439 dwarf2_attach_fields_to_type (&fi, type, cu);
14442 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
14444 /* Get the type which refers to the base class (possibly this
14445 class itself) which contains the vtable pointer for the current
14446 class from the DW_AT_containing_type attribute. This use of
14447 DW_AT_containing_type is a GNU extension. */
14449 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
14451 struct type *t = die_containing_type (die, cu);
14453 set_type_vptr_basetype (type, t);
14458 /* Our own class provides vtbl ptr. */
14459 for (i = TYPE_NFIELDS (t) - 1;
14460 i >= TYPE_N_BASECLASSES (t);
14463 const char *fieldname = TYPE_FIELD_NAME (t, i);
14465 if (is_vtable_name (fieldname, cu))
14467 set_type_vptr_fieldno (type, i);
14472 /* Complain if virtual function table field not found. */
14473 if (i < TYPE_N_BASECLASSES (t))
14474 complaint (&symfile_complaints,
14475 _("virtual function table pointer "
14476 "not found when defining class '%s'"),
14477 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
14482 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
14485 else if (cu->producer
14486 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
14488 /* The IBM XLC compiler does not provide direct indication
14489 of the containing type, but the vtable pointer is
14490 always named __vfp. */
14494 for (i = TYPE_NFIELDS (type) - 1;
14495 i >= TYPE_N_BASECLASSES (type);
14498 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
14500 set_type_vptr_fieldno (type, i);
14501 set_type_vptr_basetype (type, type);
14508 /* Copy fi.typedef_field_list linked list elements content into the
14509 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
14510 if (fi.typedef_field_list)
14512 int i = fi.typedef_field_list_count;
14514 ALLOCATE_CPLUS_STRUCT_TYPE (type);
14515 TYPE_TYPEDEF_FIELD_ARRAY (type)
14516 = ((struct typedef_field *)
14517 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
14518 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
14520 /* Reverse the list order to keep the debug info elements order. */
14523 struct typedef_field *dest, *src;
14525 dest = &TYPE_TYPEDEF_FIELD (type, i);
14526 src = &fi.typedef_field_list->field;
14527 fi.typedef_field_list = fi.typedef_field_list->next;
14532 do_cleanups (back_to);
14535 quirk_gcc_member_function_pointer (type, objfile);
14537 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
14538 snapshots) has been known to create a die giving a declaration
14539 for a class that has, as a child, a die giving a definition for a
14540 nested class. So we have to process our children even if the
14541 current die is a declaration. Normally, of course, a declaration
14542 won't have any children at all. */
14544 child_die = die->child;
14546 while (child_die != NULL && child_die->tag)
14548 if (child_die->tag == DW_TAG_member
14549 || child_die->tag == DW_TAG_variable
14550 || child_die->tag == DW_TAG_inheritance
14551 || child_die->tag == DW_TAG_template_value_param
14552 || child_die->tag == DW_TAG_template_type_param)
14557 process_die (child_die, cu);
14559 child_die = sibling_die (child_die);
14562 /* Do not consider external references. According to the DWARF standard,
14563 these DIEs are identified by the fact that they have no byte_size
14564 attribute, and a declaration attribute. */
14565 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
14566 || !die_is_declaration (die, cu))
14567 new_symbol (die, type, cu);
14570 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
14571 update TYPE using some information only available in DIE's children. */
14574 update_enumeration_type_from_children (struct die_info *die,
14576 struct dwarf2_cu *cu)
14578 struct die_info *child_die;
14579 int unsigned_enum = 1;
14583 auto_obstack obstack;
14585 for (child_die = die->child;
14586 child_die != NULL && child_die->tag;
14587 child_die = sibling_die (child_die))
14589 struct attribute *attr;
14591 const gdb_byte *bytes;
14592 struct dwarf2_locexpr_baton *baton;
14595 if (child_die->tag != DW_TAG_enumerator)
14598 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
14602 name = dwarf2_name (child_die, cu);
14604 name = "<anonymous enumerator>";
14606 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
14607 &value, &bytes, &baton);
14613 else if ((mask & value) != 0)
14618 /* If we already know that the enum type is neither unsigned, nor
14619 a flag type, no need to look at the rest of the enumerates. */
14620 if (!unsigned_enum && !flag_enum)
14625 TYPE_UNSIGNED (type) = 1;
14627 TYPE_FLAG_ENUM (type) = 1;
14630 /* Given a DW_AT_enumeration_type die, set its type. We do not
14631 complete the type's fields yet, or create any symbols. */
14633 static struct type *
14634 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
14636 struct objfile *objfile = cu->objfile;
14638 struct attribute *attr;
14641 /* If the definition of this type lives in .debug_types, read that type.
14642 Don't follow DW_AT_specification though, that will take us back up
14643 the chain and we want to go down. */
14644 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
14647 type = get_DW_AT_signature_type (die, attr, cu);
14649 /* The type's CU may not be the same as CU.
14650 Ensure TYPE is recorded with CU in die_type_hash. */
14651 return set_die_type (die, type, cu);
14654 type = alloc_type (objfile);
14656 TYPE_CODE (type) = TYPE_CODE_ENUM;
14657 name = dwarf2_full_name (NULL, die, cu);
14659 TYPE_TAG_NAME (type) = name;
14661 attr = dwarf2_attr (die, DW_AT_type, cu);
14664 struct type *underlying_type = die_type (die, cu);
14666 TYPE_TARGET_TYPE (type) = underlying_type;
14669 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14672 TYPE_LENGTH (type) = DW_UNSND (attr);
14676 TYPE_LENGTH (type) = 0;
14679 /* The enumeration DIE can be incomplete. In Ada, any type can be
14680 declared as private in the package spec, and then defined only
14681 inside the package body. Such types are known as Taft Amendment
14682 Types. When another package uses such a type, an incomplete DIE
14683 may be generated by the compiler. */
14684 if (die_is_declaration (die, cu))
14685 TYPE_STUB (type) = 1;
14687 /* Finish the creation of this type by using the enum's children.
14688 We must call this even when the underlying type has been provided
14689 so that we can determine if we're looking at a "flag" enum. */
14690 update_enumeration_type_from_children (die, type, cu);
14692 /* If this type has an underlying type that is not a stub, then we
14693 may use its attributes. We always use the "unsigned" attribute
14694 in this situation, because ordinarily we guess whether the type
14695 is unsigned -- but the guess can be wrong and the underlying type
14696 can tell us the reality. However, we defer to a local size
14697 attribute if one exists, because this lets the compiler override
14698 the underlying type if needed. */
14699 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
14701 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
14702 if (TYPE_LENGTH (type) == 0)
14703 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
14706 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
14708 return set_die_type (die, type, cu);
14711 /* Given a pointer to a die which begins an enumeration, process all
14712 the dies that define the members of the enumeration, and create the
14713 symbol for the enumeration type.
14715 NOTE: We reverse the order of the element list. */
14718 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
14720 struct type *this_type;
14722 this_type = get_die_type (die, cu);
14723 if (this_type == NULL)
14724 this_type = read_enumeration_type (die, cu);
14726 if (die->child != NULL)
14728 struct die_info *child_die;
14729 struct symbol *sym;
14730 struct field *fields = NULL;
14731 int num_fields = 0;
14734 child_die = die->child;
14735 while (child_die && child_die->tag)
14737 if (child_die->tag != DW_TAG_enumerator)
14739 process_die (child_die, cu);
14743 name = dwarf2_name (child_die, cu);
14746 sym = new_symbol (child_die, this_type, cu);
14748 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
14750 fields = (struct field *)
14752 (num_fields + DW_FIELD_ALLOC_CHUNK)
14753 * sizeof (struct field));
14756 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
14757 FIELD_TYPE (fields[num_fields]) = NULL;
14758 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
14759 FIELD_BITSIZE (fields[num_fields]) = 0;
14765 child_die = sibling_die (child_die);
14770 TYPE_NFIELDS (this_type) = num_fields;
14771 TYPE_FIELDS (this_type) = (struct field *)
14772 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
14773 memcpy (TYPE_FIELDS (this_type), fields,
14774 sizeof (struct field) * num_fields);
14779 /* If we are reading an enum from a .debug_types unit, and the enum
14780 is a declaration, and the enum is not the signatured type in the
14781 unit, then we do not want to add a symbol for it. Adding a
14782 symbol would in some cases obscure the true definition of the
14783 enum, giving users an incomplete type when the definition is
14784 actually available. Note that we do not want to do this for all
14785 enums which are just declarations, because C++0x allows forward
14786 enum declarations. */
14787 if (cu->per_cu->is_debug_types
14788 && die_is_declaration (die, cu))
14790 struct signatured_type *sig_type;
14792 sig_type = (struct signatured_type *) cu->per_cu;
14793 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
14794 if (sig_type->type_offset_in_section != die->sect_off)
14798 new_symbol (die, this_type, cu);
14801 /* Extract all information from a DW_TAG_array_type DIE and put it in
14802 the DIE's type field. For now, this only handles one dimensional
14805 static struct type *
14806 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
14808 struct objfile *objfile = cu->objfile;
14809 struct die_info *child_die;
14811 struct type *element_type, *range_type, *index_type;
14812 struct attribute *attr;
14814 unsigned int bit_stride = 0;
14816 element_type = die_type (die, cu);
14818 /* The die_type call above may have already set the type for this DIE. */
14819 type = get_die_type (die, cu);
14823 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
14825 bit_stride = DW_UNSND (attr) * 8;
14827 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
14829 bit_stride = DW_UNSND (attr);
14831 /* Irix 6.2 native cc creates array types without children for
14832 arrays with unspecified length. */
14833 if (die->child == NULL)
14835 index_type = objfile_type (objfile)->builtin_int;
14836 range_type = create_static_range_type (NULL, index_type, 0, -1);
14837 type = create_array_type_with_stride (NULL, element_type, range_type,
14839 return set_die_type (die, type, cu);
14842 std::vector<struct type *> range_types;
14843 child_die = die->child;
14844 while (child_die && child_die->tag)
14846 if (child_die->tag == DW_TAG_subrange_type)
14848 struct type *child_type = read_type_die (child_die, cu);
14850 if (child_type != NULL)
14852 /* The range type was succesfully read. Save it for the
14853 array type creation. */
14854 range_types.push_back (child_type);
14857 child_die = sibling_die (child_die);
14860 /* Dwarf2 dimensions are output from left to right, create the
14861 necessary array types in backwards order. */
14863 type = element_type;
14865 if (read_array_order (die, cu) == DW_ORD_col_major)
14869 while (i < range_types.size ())
14870 type = create_array_type_with_stride (NULL, type, range_types[i++],
14875 size_t ndim = range_types.size ();
14877 type = create_array_type_with_stride (NULL, type, range_types[ndim],
14881 /* Understand Dwarf2 support for vector types (like they occur on
14882 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
14883 array type. This is not part of the Dwarf2/3 standard yet, but a
14884 custom vendor extension. The main difference between a regular
14885 array and the vector variant is that vectors are passed by value
14887 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
14889 make_vector_type (type);
14891 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
14892 implementation may choose to implement triple vectors using this
14894 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14897 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
14898 TYPE_LENGTH (type) = DW_UNSND (attr);
14900 complaint (&symfile_complaints,
14901 _("DW_AT_byte_size for array type smaller "
14902 "than the total size of elements"));
14905 name = dwarf2_name (die, cu);
14907 TYPE_NAME (type) = name;
14909 /* Install the type in the die. */
14910 set_die_type (die, type, cu);
14912 /* set_die_type should be already done. */
14913 set_descriptive_type (type, die, cu);
14918 static enum dwarf_array_dim_ordering
14919 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
14921 struct attribute *attr;
14923 attr = dwarf2_attr (die, DW_AT_ordering, cu);
14926 return (enum dwarf_array_dim_ordering) DW_SND (attr);
14928 /* GNU F77 is a special case, as at 08/2004 array type info is the
14929 opposite order to the dwarf2 specification, but data is still
14930 laid out as per normal fortran.
14932 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
14933 version checking. */
14935 if (cu->language == language_fortran
14936 && cu->producer && strstr (cu->producer, "GNU F77"))
14938 return DW_ORD_row_major;
14941 switch (cu->language_defn->la_array_ordering)
14943 case array_column_major:
14944 return DW_ORD_col_major;
14945 case array_row_major:
14947 return DW_ORD_row_major;
14951 /* Extract all information from a DW_TAG_set_type DIE and put it in
14952 the DIE's type field. */
14954 static struct type *
14955 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
14957 struct type *domain_type, *set_type;
14958 struct attribute *attr;
14960 domain_type = die_type (die, cu);
14962 /* The die_type call above may have already set the type for this DIE. */
14963 set_type = get_die_type (die, cu);
14967 set_type = create_set_type (NULL, domain_type);
14969 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14971 TYPE_LENGTH (set_type) = DW_UNSND (attr);
14973 return set_die_type (die, set_type, cu);
14976 /* A helper for read_common_block that creates a locexpr baton.
14977 SYM is the symbol which we are marking as computed.
14978 COMMON_DIE is the DIE for the common block.
14979 COMMON_LOC is the location expression attribute for the common
14981 MEMBER_LOC is the location expression attribute for the particular
14982 member of the common block that we are processing.
14983 CU is the CU from which the above come. */
14986 mark_common_block_symbol_computed (struct symbol *sym,
14987 struct die_info *common_die,
14988 struct attribute *common_loc,
14989 struct attribute *member_loc,
14990 struct dwarf2_cu *cu)
14992 struct objfile *objfile = dwarf2_per_objfile->objfile;
14993 struct dwarf2_locexpr_baton *baton;
14995 unsigned int cu_off;
14996 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
14997 LONGEST offset = 0;
14999 gdb_assert (common_loc && member_loc);
15000 gdb_assert (attr_form_is_block (common_loc));
15001 gdb_assert (attr_form_is_block (member_loc)
15002 || attr_form_is_constant (member_loc));
15004 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
15005 baton->per_cu = cu->per_cu;
15006 gdb_assert (baton->per_cu);
15008 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
15010 if (attr_form_is_constant (member_loc))
15012 offset = dwarf2_get_attr_constant_value (member_loc, 0);
15013 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
15016 baton->size += DW_BLOCK (member_loc)->size;
15018 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
15021 *ptr++ = DW_OP_call4;
15022 cu_off = common_die->sect_off - cu->per_cu->sect_off;
15023 store_unsigned_integer (ptr, 4, byte_order, cu_off);
15026 if (attr_form_is_constant (member_loc))
15028 *ptr++ = DW_OP_addr;
15029 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
15030 ptr += cu->header.addr_size;
15034 /* We have to copy the data here, because DW_OP_call4 will only
15035 use a DW_AT_location attribute. */
15036 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
15037 ptr += DW_BLOCK (member_loc)->size;
15040 *ptr++ = DW_OP_plus;
15041 gdb_assert (ptr - baton->data == baton->size);
15043 SYMBOL_LOCATION_BATON (sym) = baton;
15044 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
15047 /* Create appropriate locally-scoped variables for all the
15048 DW_TAG_common_block entries. Also create a struct common_block
15049 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
15050 is used to sepate the common blocks name namespace from regular
15054 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
15056 struct attribute *attr;
15058 attr = dwarf2_attr (die, DW_AT_location, cu);
15061 /* Support the .debug_loc offsets. */
15062 if (attr_form_is_block (attr))
15066 else if (attr_form_is_section_offset (attr))
15068 dwarf2_complex_location_expr_complaint ();
15073 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15074 "common block member");
15079 if (die->child != NULL)
15081 struct objfile *objfile = cu->objfile;
15082 struct die_info *child_die;
15083 size_t n_entries = 0, size;
15084 struct common_block *common_block;
15085 struct symbol *sym;
15087 for (child_die = die->child;
15088 child_die && child_die->tag;
15089 child_die = sibling_die (child_die))
15092 size = (sizeof (struct common_block)
15093 + (n_entries - 1) * sizeof (struct symbol *));
15095 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
15097 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
15098 common_block->n_entries = 0;
15100 for (child_die = die->child;
15101 child_die && child_die->tag;
15102 child_die = sibling_die (child_die))
15104 /* Create the symbol in the DW_TAG_common_block block in the current
15106 sym = new_symbol (child_die, NULL, cu);
15109 struct attribute *member_loc;
15111 common_block->contents[common_block->n_entries++] = sym;
15113 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
15117 /* GDB has handled this for a long time, but it is
15118 not specified by DWARF. It seems to have been
15119 emitted by gfortran at least as recently as:
15120 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
15121 complaint (&symfile_complaints,
15122 _("Variable in common block has "
15123 "DW_AT_data_member_location "
15124 "- DIE at 0x%x [in module %s]"),
15125 to_underlying (child_die->sect_off),
15126 objfile_name (cu->objfile));
15128 if (attr_form_is_section_offset (member_loc))
15129 dwarf2_complex_location_expr_complaint ();
15130 else if (attr_form_is_constant (member_loc)
15131 || attr_form_is_block (member_loc))
15134 mark_common_block_symbol_computed (sym, die, attr,
15138 dwarf2_complex_location_expr_complaint ();
15143 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
15144 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
15148 /* Create a type for a C++ namespace. */
15150 static struct type *
15151 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
15153 struct objfile *objfile = cu->objfile;
15154 const char *previous_prefix, *name;
15158 /* For extensions, reuse the type of the original namespace. */
15159 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
15161 struct die_info *ext_die;
15162 struct dwarf2_cu *ext_cu = cu;
15164 ext_die = dwarf2_extension (die, &ext_cu);
15165 type = read_type_die (ext_die, ext_cu);
15167 /* EXT_CU may not be the same as CU.
15168 Ensure TYPE is recorded with CU in die_type_hash. */
15169 return set_die_type (die, type, cu);
15172 name = namespace_name (die, &is_anonymous, cu);
15174 /* Now build the name of the current namespace. */
15176 previous_prefix = determine_prefix (die, cu);
15177 if (previous_prefix[0] != '\0')
15178 name = typename_concat (&objfile->objfile_obstack,
15179 previous_prefix, name, 0, cu);
15181 /* Create the type. */
15182 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
15183 TYPE_TAG_NAME (type) = TYPE_NAME (type);
15185 return set_die_type (die, type, cu);
15188 /* Read a namespace scope. */
15191 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
15193 struct objfile *objfile = cu->objfile;
15196 /* Add a symbol associated to this if we haven't seen the namespace
15197 before. Also, add a using directive if it's an anonymous
15200 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
15204 type = read_type_die (die, cu);
15205 new_symbol (die, type, cu);
15207 namespace_name (die, &is_anonymous, cu);
15210 const char *previous_prefix = determine_prefix (die, cu);
15212 std::vector<const char *> excludes;
15213 add_using_directive (using_directives (cu->language),
15214 previous_prefix, TYPE_NAME (type), NULL,
15215 NULL, excludes, 0, &objfile->objfile_obstack);
15219 if (die->child != NULL)
15221 struct die_info *child_die = die->child;
15223 while (child_die && child_die->tag)
15225 process_die (child_die, cu);
15226 child_die = sibling_die (child_die);
15231 /* Read a Fortran module as type. This DIE can be only a declaration used for
15232 imported module. Still we need that type as local Fortran "use ... only"
15233 declaration imports depend on the created type in determine_prefix. */
15235 static struct type *
15236 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
15238 struct objfile *objfile = cu->objfile;
15239 const char *module_name;
15242 module_name = dwarf2_name (die, cu);
15244 complaint (&symfile_complaints,
15245 _("DW_TAG_module has no name, offset 0x%x"),
15246 to_underlying (die->sect_off));
15247 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
15249 /* determine_prefix uses TYPE_TAG_NAME. */
15250 TYPE_TAG_NAME (type) = TYPE_NAME (type);
15252 return set_die_type (die, type, cu);
15255 /* Read a Fortran module. */
15258 read_module (struct die_info *die, struct dwarf2_cu *cu)
15260 struct die_info *child_die = die->child;
15263 type = read_type_die (die, cu);
15264 new_symbol (die, type, cu);
15266 while (child_die && child_die->tag)
15268 process_die (child_die, cu);
15269 child_die = sibling_die (child_die);
15273 /* Return the name of the namespace represented by DIE. Set
15274 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
15277 static const char *
15278 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
15280 struct die_info *current_die;
15281 const char *name = NULL;
15283 /* Loop through the extensions until we find a name. */
15285 for (current_die = die;
15286 current_die != NULL;
15287 current_die = dwarf2_extension (die, &cu))
15289 /* We don't use dwarf2_name here so that we can detect the absence
15290 of a name -> anonymous namespace. */
15291 name = dwarf2_string_attr (die, DW_AT_name, cu);
15297 /* Is it an anonymous namespace? */
15299 *is_anonymous = (name == NULL);
15301 name = CP_ANONYMOUS_NAMESPACE_STR;
15306 /* Extract all information from a DW_TAG_pointer_type DIE and add to
15307 the user defined type vector. */
15309 static struct type *
15310 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
15312 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
15313 struct comp_unit_head *cu_header = &cu->header;
15315 struct attribute *attr_byte_size;
15316 struct attribute *attr_address_class;
15317 int byte_size, addr_class;
15318 struct type *target_type;
15320 target_type = die_type (die, cu);
15322 /* The die_type call above may have already set the type for this DIE. */
15323 type = get_die_type (die, cu);
15327 type = lookup_pointer_type (target_type);
15329 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
15330 if (attr_byte_size)
15331 byte_size = DW_UNSND (attr_byte_size);
15333 byte_size = cu_header->addr_size;
15335 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
15336 if (attr_address_class)
15337 addr_class = DW_UNSND (attr_address_class);
15339 addr_class = DW_ADDR_none;
15341 /* If the pointer size or address class is different than the
15342 default, create a type variant marked as such and set the
15343 length accordingly. */
15344 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
15346 if (gdbarch_address_class_type_flags_p (gdbarch))
15350 type_flags = gdbarch_address_class_type_flags
15351 (gdbarch, byte_size, addr_class);
15352 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
15354 type = make_type_with_address_space (type, type_flags);
15356 else if (TYPE_LENGTH (type) != byte_size)
15358 complaint (&symfile_complaints,
15359 _("invalid pointer size %d"), byte_size);
15363 /* Should we also complain about unhandled address classes? */
15367 TYPE_LENGTH (type) = byte_size;
15368 return set_die_type (die, type, cu);
15371 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
15372 the user defined type vector. */
15374 static struct type *
15375 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
15378 struct type *to_type;
15379 struct type *domain;
15381 to_type = die_type (die, cu);
15382 domain = die_containing_type (die, cu);
15384 /* The calls above may have already set the type for this DIE. */
15385 type = get_die_type (die, cu);
15389 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
15390 type = lookup_methodptr_type (to_type);
15391 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
15393 struct type *new_type = alloc_type (cu->objfile);
15395 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
15396 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
15397 TYPE_VARARGS (to_type));
15398 type = lookup_methodptr_type (new_type);
15401 type = lookup_memberptr_type (to_type, domain);
15403 return set_die_type (die, type, cu);
15406 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
15407 the user defined type vector. */
15409 static struct type *
15410 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
15411 enum type_code refcode)
15413 struct comp_unit_head *cu_header = &cu->header;
15414 struct type *type, *target_type;
15415 struct attribute *attr;
15417 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
15419 target_type = die_type (die, cu);
15421 /* The die_type call above may have already set the type for this DIE. */
15422 type = get_die_type (die, cu);
15426 type = lookup_reference_type (target_type, refcode);
15427 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15430 TYPE_LENGTH (type) = DW_UNSND (attr);
15434 TYPE_LENGTH (type) = cu_header->addr_size;
15436 return set_die_type (die, type, cu);
15439 /* Add the given cv-qualifiers to the element type of the array. GCC
15440 outputs DWARF type qualifiers that apply to an array, not the
15441 element type. But GDB relies on the array element type to carry
15442 the cv-qualifiers. This mimics section 6.7.3 of the C99
15445 static struct type *
15446 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
15447 struct type *base_type, int cnst, int voltl)
15449 struct type *el_type, *inner_array;
15451 base_type = copy_type (base_type);
15452 inner_array = base_type;
15454 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
15456 TYPE_TARGET_TYPE (inner_array) =
15457 copy_type (TYPE_TARGET_TYPE (inner_array));
15458 inner_array = TYPE_TARGET_TYPE (inner_array);
15461 el_type = TYPE_TARGET_TYPE (inner_array);
15462 cnst |= TYPE_CONST (el_type);
15463 voltl |= TYPE_VOLATILE (el_type);
15464 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
15466 return set_die_type (die, base_type, cu);
15469 static struct type *
15470 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
15472 struct type *base_type, *cv_type;
15474 base_type = die_type (die, cu);
15476 /* The die_type call above may have already set the type for this DIE. */
15477 cv_type = get_die_type (die, cu);
15481 /* In case the const qualifier is applied to an array type, the element type
15482 is so qualified, not the array type (section 6.7.3 of C99). */
15483 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
15484 return add_array_cv_type (die, cu, base_type, 1, 0);
15486 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
15487 return set_die_type (die, cv_type, cu);
15490 static struct type *
15491 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
15493 struct type *base_type, *cv_type;
15495 base_type = die_type (die, cu);
15497 /* The die_type call above may have already set the type for this DIE. */
15498 cv_type = get_die_type (die, cu);
15502 /* In case the volatile qualifier is applied to an array type, the
15503 element type is so qualified, not the array type (section 6.7.3
15505 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
15506 return add_array_cv_type (die, cu, base_type, 0, 1);
15508 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
15509 return set_die_type (die, cv_type, cu);
15512 /* Handle DW_TAG_restrict_type. */
15514 static struct type *
15515 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
15517 struct type *base_type, *cv_type;
15519 base_type = die_type (die, cu);
15521 /* The die_type call above may have already set the type for this DIE. */
15522 cv_type = get_die_type (die, cu);
15526 cv_type = make_restrict_type (base_type);
15527 return set_die_type (die, cv_type, cu);
15530 /* Handle DW_TAG_atomic_type. */
15532 static struct type *
15533 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
15535 struct type *base_type, *cv_type;
15537 base_type = die_type (die, cu);
15539 /* The die_type call above may have already set the type for this DIE. */
15540 cv_type = get_die_type (die, cu);
15544 cv_type = make_atomic_type (base_type);
15545 return set_die_type (die, cv_type, cu);
15548 /* Extract all information from a DW_TAG_string_type DIE and add to
15549 the user defined type vector. It isn't really a user defined type,
15550 but it behaves like one, with other DIE's using an AT_user_def_type
15551 attribute to reference it. */
15553 static struct type *
15554 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
15556 struct objfile *objfile = cu->objfile;
15557 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15558 struct type *type, *range_type, *index_type, *char_type;
15559 struct attribute *attr;
15560 unsigned int length;
15562 attr = dwarf2_attr (die, DW_AT_string_length, cu);
15565 length = DW_UNSND (attr);
15569 /* Check for the DW_AT_byte_size attribute. */
15570 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15573 length = DW_UNSND (attr);
15581 index_type = objfile_type (objfile)->builtin_int;
15582 range_type = create_static_range_type (NULL, index_type, 1, length);
15583 char_type = language_string_char_type (cu->language_defn, gdbarch);
15584 type = create_string_type (NULL, char_type, range_type);
15586 return set_die_type (die, type, cu);
15589 /* Assuming that DIE corresponds to a function, returns nonzero
15590 if the function is prototyped. */
15593 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
15595 struct attribute *attr;
15597 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
15598 if (attr && (DW_UNSND (attr) != 0))
15601 /* The DWARF standard implies that the DW_AT_prototyped attribute
15602 is only meaninful for C, but the concept also extends to other
15603 languages that allow unprototyped functions (Eg: Objective C).
15604 For all other languages, assume that functions are always
15606 if (cu->language != language_c
15607 && cu->language != language_objc
15608 && cu->language != language_opencl)
15611 /* RealView does not emit DW_AT_prototyped. We can not distinguish
15612 prototyped and unprototyped functions; default to prototyped,
15613 since that is more common in modern code (and RealView warns
15614 about unprototyped functions). */
15615 if (producer_is_realview (cu->producer))
15621 /* Handle DIES due to C code like:
15625 int (*funcp)(int a, long l);
15629 ('funcp' generates a DW_TAG_subroutine_type DIE). */
15631 static struct type *
15632 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
15634 struct objfile *objfile = cu->objfile;
15635 struct type *type; /* Type that this function returns. */
15636 struct type *ftype; /* Function that returns above type. */
15637 struct attribute *attr;
15639 type = die_type (die, cu);
15641 /* The die_type call above may have already set the type for this DIE. */
15642 ftype = get_die_type (die, cu);
15646 ftype = lookup_function_type (type);
15648 if (prototyped_function_p (die, cu))
15649 TYPE_PROTOTYPED (ftype) = 1;
15651 /* Store the calling convention in the type if it's available in
15652 the subroutine die. Otherwise set the calling convention to
15653 the default value DW_CC_normal. */
15654 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
15656 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
15657 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
15658 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
15660 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
15662 /* Record whether the function returns normally to its caller or not
15663 if the DWARF producer set that information. */
15664 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
15665 if (attr && (DW_UNSND (attr) != 0))
15666 TYPE_NO_RETURN (ftype) = 1;
15668 /* We need to add the subroutine type to the die immediately so
15669 we don't infinitely recurse when dealing with parameters
15670 declared as the same subroutine type. */
15671 set_die_type (die, ftype, cu);
15673 if (die->child != NULL)
15675 struct type *void_type = objfile_type (objfile)->builtin_void;
15676 struct die_info *child_die;
15677 int nparams, iparams;
15679 /* Count the number of parameters.
15680 FIXME: GDB currently ignores vararg functions, but knows about
15681 vararg member functions. */
15683 child_die = die->child;
15684 while (child_die && child_die->tag)
15686 if (child_die->tag == DW_TAG_formal_parameter)
15688 else if (child_die->tag == DW_TAG_unspecified_parameters)
15689 TYPE_VARARGS (ftype) = 1;
15690 child_die = sibling_die (child_die);
15693 /* Allocate storage for parameters and fill them in. */
15694 TYPE_NFIELDS (ftype) = nparams;
15695 TYPE_FIELDS (ftype) = (struct field *)
15696 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
15698 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
15699 even if we error out during the parameters reading below. */
15700 for (iparams = 0; iparams < nparams; iparams++)
15701 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
15704 child_die = die->child;
15705 while (child_die && child_die->tag)
15707 if (child_die->tag == DW_TAG_formal_parameter)
15709 struct type *arg_type;
15711 /* DWARF version 2 has no clean way to discern C++
15712 static and non-static member functions. G++ helps
15713 GDB by marking the first parameter for non-static
15714 member functions (which is the this pointer) as
15715 artificial. We pass this information to
15716 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
15718 DWARF version 3 added DW_AT_object_pointer, which GCC
15719 4.5 does not yet generate. */
15720 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
15722 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
15724 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
15725 arg_type = die_type (child_die, cu);
15727 /* RealView does not mark THIS as const, which the testsuite
15728 expects. GCC marks THIS as const in method definitions,
15729 but not in the class specifications (GCC PR 43053). */
15730 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
15731 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
15734 struct dwarf2_cu *arg_cu = cu;
15735 const char *name = dwarf2_name (child_die, cu);
15737 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
15740 /* If the compiler emits this, use it. */
15741 if (follow_die_ref (die, attr, &arg_cu) == child_die)
15744 else if (name && strcmp (name, "this") == 0)
15745 /* Function definitions will have the argument names. */
15747 else if (name == NULL && iparams == 0)
15748 /* Declarations may not have the names, so like
15749 elsewhere in GDB, assume an artificial first
15750 argument is "this". */
15754 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
15758 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
15761 child_die = sibling_die (child_die);
15768 static struct type *
15769 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
15771 struct objfile *objfile = cu->objfile;
15772 const char *name = NULL;
15773 struct type *this_type, *target_type;
15775 name = dwarf2_full_name (NULL, die, cu);
15776 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
15777 TYPE_TARGET_STUB (this_type) = 1;
15778 set_die_type (die, this_type, cu);
15779 target_type = die_type (die, cu);
15780 if (target_type != this_type)
15781 TYPE_TARGET_TYPE (this_type) = target_type;
15784 /* Self-referential typedefs are, it seems, not allowed by the DWARF
15785 spec and cause infinite loops in GDB. */
15786 complaint (&symfile_complaints,
15787 _("Self-referential DW_TAG_typedef "
15788 "- DIE at 0x%x [in module %s]"),
15789 to_underlying (die->sect_off), objfile_name (objfile));
15790 TYPE_TARGET_TYPE (this_type) = NULL;
15795 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
15796 (which may be different from NAME) to the architecture back-end to allow
15797 it to guess the correct format if necessary. */
15799 static struct type *
15800 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
15801 const char *name_hint)
15803 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15804 const struct floatformat **format;
15807 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
15809 type = init_float_type (objfile, bits, name, format);
15811 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
15816 /* Find a representation of a given base type and install
15817 it in the TYPE field of the die. */
15819 static struct type *
15820 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
15822 struct objfile *objfile = cu->objfile;
15824 struct attribute *attr;
15825 int encoding = 0, bits = 0;
15828 attr = dwarf2_attr (die, DW_AT_encoding, cu);
15831 encoding = DW_UNSND (attr);
15833 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15836 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
15838 name = dwarf2_name (die, cu);
15841 complaint (&symfile_complaints,
15842 _("DW_AT_name missing from DW_TAG_base_type"));
15847 case DW_ATE_address:
15848 /* Turn DW_ATE_address into a void * pointer. */
15849 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
15850 type = init_pointer_type (objfile, bits, name, type);
15852 case DW_ATE_boolean:
15853 type = init_boolean_type (objfile, bits, 1, name);
15855 case DW_ATE_complex_float:
15856 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
15857 type = init_complex_type (objfile, name, type);
15859 case DW_ATE_decimal_float:
15860 type = init_decfloat_type (objfile, bits, name);
15863 type = dwarf2_init_float_type (objfile, bits, name, name);
15865 case DW_ATE_signed:
15866 type = init_integer_type (objfile, bits, 0, name);
15868 case DW_ATE_unsigned:
15869 if (cu->language == language_fortran
15871 && startswith (name, "character("))
15872 type = init_character_type (objfile, bits, 1, name);
15874 type = init_integer_type (objfile, bits, 1, name);
15876 case DW_ATE_signed_char:
15877 if (cu->language == language_ada || cu->language == language_m2
15878 || cu->language == language_pascal
15879 || cu->language == language_fortran)
15880 type = init_character_type (objfile, bits, 0, name);
15882 type = init_integer_type (objfile, bits, 0, name);
15884 case DW_ATE_unsigned_char:
15885 if (cu->language == language_ada || cu->language == language_m2
15886 || cu->language == language_pascal
15887 || cu->language == language_fortran
15888 || cu->language == language_rust)
15889 type = init_character_type (objfile, bits, 1, name);
15891 type = init_integer_type (objfile, bits, 1, name);
15895 gdbarch *arch = get_objfile_arch (objfile);
15898 type = builtin_type (arch)->builtin_char16;
15899 else if (bits == 32)
15900 type = builtin_type (arch)->builtin_char32;
15903 complaint (&symfile_complaints,
15904 _("unsupported DW_ATE_UTF bit size: '%d'"),
15906 type = init_integer_type (objfile, bits, 1, name);
15908 return set_die_type (die, type, cu);
15913 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
15914 dwarf_type_encoding_name (encoding));
15915 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
15919 if (name && strcmp (name, "char") == 0)
15920 TYPE_NOSIGN (type) = 1;
15922 return set_die_type (die, type, cu);
15925 /* Parse dwarf attribute if it's a block, reference or constant and put the
15926 resulting value of the attribute into struct bound_prop.
15927 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
15930 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
15931 struct dwarf2_cu *cu, struct dynamic_prop *prop)
15933 struct dwarf2_property_baton *baton;
15934 struct obstack *obstack = &cu->objfile->objfile_obstack;
15936 if (attr == NULL || prop == NULL)
15939 if (attr_form_is_block (attr))
15941 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15942 baton->referenced_type = NULL;
15943 baton->locexpr.per_cu = cu->per_cu;
15944 baton->locexpr.size = DW_BLOCK (attr)->size;
15945 baton->locexpr.data = DW_BLOCK (attr)->data;
15946 prop->data.baton = baton;
15947 prop->kind = PROP_LOCEXPR;
15948 gdb_assert (prop->data.baton != NULL);
15950 else if (attr_form_is_ref (attr))
15952 struct dwarf2_cu *target_cu = cu;
15953 struct die_info *target_die;
15954 struct attribute *target_attr;
15956 target_die = follow_die_ref (die, attr, &target_cu);
15957 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
15958 if (target_attr == NULL)
15959 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
15961 if (target_attr == NULL)
15964 switch (target_attr->name)
15966 case DW_AT_location:
15967 if (attr_form_is_section_offset (target_attr))
15969 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15970 baton->referenced_type = die_type (target_die, target_cu);
15971 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
15972 prop->data.baton = baton;
15973 prop->kind = PROP_LOCLIST;
15974 gdb_assert (prop->data.baton != NULL);
15976 else if (attr_form_is_block (target_attr))
15978 baton = XOBNEW (obstack, struct dwarf2_property_baton);
15979 baton->referenced_type = die_type (target_die, target_cu);
15980 baton->locexpr.per_cu = cu->per_cu;
15981 baton->locexpr.size = DW_BLOCK (target_attr)->size;
15982 baton->locexpr.data = DW_BLOCK (target_attr)->data;
15983 prop->data.baton = baton;
15984 prop->kind = PROP_LOCEXPR;
15985 gdb_assert (prop->data.baton != NULL);
15989 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15990 "dynamic property");
15994 case DW_AT_data_member_location:
15998 if (!handle_data_member_location (target_die, target_cu,
16002 baton = XOBNEW (obstack, struct dwarf2_property_baton);
16003 baton->referenced_type = read_type_die (target_die->parent,
16005 baton->offset_info.offset = offset;
16006 baton->offset_info.type = die_type (target_die, target_cu);
16007 prop->data.baton = baton;
16008 prop->kind = PROP_ADDR_OFFSET;
16013 else if (attr_form_is_constant (attr))
16015 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
16016 prop->kind = PROP_CONST;
16020 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
16021 dwarf2_name (die, cu));
16028 /* Read the given DW_AT_subrange DIE. */
16030 static struct type *
16031 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
16033 struct type *base_type, *orig_base_type;
16034 struct type *range_type;
16035 struct attribute *attr;
16036 struct dynamic_prop low, high;
16037 int low_default_is_valid;
16038 int high_bound_is_count = 0;
16040 LONGEST negative_mask;
16042 orig_base_type = die_type (die, cu);
16043 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
16044 whereas the real type might be. So, we use ORIG_BASE_TYPE when
16045 creating the range type, but we use the result of check_typedef
16046 when examining properties of the type. */
16047 base_type = check_typedef (orig_base_type);
16049 /* The die_type call above may have already set the type for this DIE. */
16050 range_type = get_die_type (die, cu);
16054 low.kind = PROP_CONST;
16055 high.kind = PROP_CONST;
16056 high.data.const_val = 0;
16058 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
16059 omitting DW_AT_lower_bound. */
16060 switch (cu->language)
16063 case language_cplus:
16064 low.data.const_val = 0;
16065 low_default_is_valid = 1;
16067 case language_fortran:
16068 low.data.const_val = 1;
16069 low_default_is_valid = 1;
16072 case language_objc:
16073 case language_rust:
16074 low.data.const_val = 0;
16075 low_default_is_valid = (cu->header.version >= 4);
16079 case language_pascal:
16080 low.data.const_val = 1;
16081 low_default_is_valid = (cu->header.version >= 4);
16084 low.data.const_val = 0;
16085 low_default_is_valid = 0;
16089 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
16091 attr_to_dynamic_prop (attr, die, cu, &low);
16092 else if (!low_default_is_valid)
16093 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
16094 "- DIE at 0x%x [in module %s]"),
16095 to_underlying (die->sect_off), objfile_name (cu->objfile));
16097 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
16098 if (!attr_to_dynamic_prop (attr, die, cu, &high))
16100 attr = dwarf2_attr (die, DW_AT_count, cu);
16101 if (attr_to_dynamic_prop (attr, die, cu, &high))
16103 /* If bounds are constant do the final calculation here. */
16104 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
16105 high.data.const_val = low.data.const_val + high.data.const_val - 1;
16107 high_bound_is_count = 1;
16111 /* Dwarf-2 specifications explicitly allows to create subrange types
16112 without specifying a base type.
16113 In that case, the base type must be set to the type of
16114 the lower bound, upper bound or count, in that order, if any of these
16115 three attributes references an object that has a type.
16116 If no base type is found, the Dwarf-2 specifications say that
16117 a signed integer type of size equal to the size of an address should
16119 For the following C code: `extern char gdb_int [];'
16120 GCC produces an empty range DIE.
16121 FIXME: muller/2010-05-28: Possible references to object for low bound,
16122 high bound or count are not yet handled by this code. */
16123 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
16125 struct objfile *objfile = cu->objfile;
16126 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16127 int addr_size = gdbarch_addr_bit (gdbarch) /8;
16128 struct type *int_type = objfile_type (objfile)->builtin_int;
16130 /* Test "int", "long int", and "long long int" objfile types,
16131 and select the first one having a size above or equal to the
16132 architecture address size. */
16133 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
16134 base_type = int_type;
16137 int_type = objfile_type (objfile)->builtin_long;
16138 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
16139 base_type = int_type;
16142 int_type = objfile_type (objfile)->builtin_long_long;
16143 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
16144 base_type = int_type;
16149 /* Normally, the DWARF producers are expected to use a signed
16150 constant form (Eg. DW_FORM_sdata) to express negative bounds.
16151 But this is unfortunately not always the case, as witnessed
16152 with GCC, for instance, where the ambiguous DW_FORM_dataN form
16153 is used instead. To work around that ambiguity, we treat
16154 the bounds as signed, and thus sign-extend their values, when
16155 the base type is signed. */
16157 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
16158 if (low.kind == PROP_CONST
16159 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
16160 low.data.const_val |= negative_mask;
16161 if (high.kind == PROP_CONST
16162 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
16163 high.data.const_val |= negative_mask;
16165 range_type = create_range_type (NULL, orig_base_type, &low, &high);
16167 if (high_bound_is_count)
16168 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
16170 /* Ada expects an empty array on no boundary attributes. */
16171 if (attr == NULL && cu->language != language_ada)
16172 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
16174 name = dwarf2_name (die, cu);
16176 TYPE_NAME (range_type) = name;
16178 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16180 TYPE_LENGTH (range_type) = DW_UNSND (attr);
16182 set_die_type (die, range_type, cu);
16184 /* set_die_type should be already done. */
16185 set_descriptive_type (range_type, die, cu);
16190 static struct type *
16191 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
16195 /* For now, we only support the C meaning of an unspecified type: void. */
16197 type = init_type (cu->objfile, TYPE_CODE_VOID, 0, NULL);
16198 TYPE_NAME (type) = dwarf2_name (die, cu);
16200 return set_die_type (die, type, cu);
16203 /* Read a single die and all its descendents. Set the die's sibling
16204 field to NULL; set other fields in the die correctly, and set all
16205 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
16206 location of the info_ptr after reading all of those dies. PARENT
16207 is the parent of the die in question. */
16209 static struct die_info *
16210 read_die_and_children (const struct die_reader_specs *reader,
16211 const gdb_byte *info_ptr,
16212 const gdb_byte **new_info_ptr,
16213 struct die_info *parent)
16215 struct die_info *die;
16216 const gdb_byte *cur_ptr;
16219 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
16222 *new_info_ptr = cur_ptr;
16225 store_in_ref_table (die, reader->cu);
16228 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
16232 *new_info_ptr = cur_ptr;
16235 die->sibling = NULL;
16236 die->parent = parent;
16240 /* Read a die, all of its descendents, and all of its siblings; set
16241 all of the fields of all of the dies correctly. Arguments are as
16242 in read_die_and_children. */
16244 static struct die_info *
16245 read_die_and_siblings_1 (const struct die_reader_specs *reader,
16246 const gdb_byte *info_ptr,
16247 const gdb_byte **new_info_ptr,
16248 struct die_info *parent)
16250 struct die_info *first_die, *last_sibling;
16251 const gdb_byte *cur_ptr;
16253 cur_ptr = info_ptr;
16254 first_die = last_sibling = NULL;
16258 struct die_info *die
16259 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
16263 *new_info_ptr = cur_ptr;
16270 last_sibling->sibling = die;
16272 last_sibling = die;
16276 /* Read a die, all of its descendents, and all of its siblings; set
16277 all of the fields of all of the dies correctly. Arguments are as
16278 in read_die_and_children.
16279 This the main entry point for reading a DIE and all its children. */
16281 static struct die_info *
16282 read_die_and_siblings (const struct die_reader_specs *reader,
16283 const gdb_byte *info_ptr,
16284 const gdb_byte **new_info_ptr,
16285 struct die_info *parent)
16287 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
16288 new_info_ptr, parent);
16290 if (dwarf_die_debug)
16292 fprintf_unfiltered (gdb_stdlog,
16293 "Read die from %s@0x%x of %s:\n",
16294 get_section_name (reader->die_section),
16295 (unsigned) (info_ptr - reader->die_section->buffer),
16296 bfd_get_filename (reader->abfd));
16297 dump_die (die, dwarf_die_debug);
16303 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
16305 The caller is responsible for filling in the extra attributes
16306 and updating (*DIEP)->num_attrs.
16307 Set DIEP to point to a newly allocated die with its information,
16308 except for its child, sibling, and parent fields.
16309 Set HAS_CHILDREN to tell whether the die has children or not. */
16311 static const gdb_byte *
16312 read_full_die_1 (const struct die_reader_specs *reader,
16313 struct die_info **diep, const gdb_byte *info_ptr,
16314 int *has_children, int num_extra_attrs)
16316 unsigned int abbrev_number, bytes_read, i;
16317 struct abbrev_info *abbrev;
16318 struct die_info *die;
16319 struct dwarf2_cu *cu = reader->cu;
16320 bfd *abfd = reader->abfd;
16322 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
16323 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16324 info_ptr += bytes_read;
16325 if (!abbrev_number)
16332 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
16334 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
16336 bfd_get_filename (abfd));
16338 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
16339 die->sect_off = sect_off;
16340 die->tag = abbrev->tag;
16341 die->abbrev = abbrev_number;
16343 /* Make the result usable.
16344 The caller needs to update num_attrs after adding the extra
16346 die->num_attrs = abbrev->num_attrs;
16348 for (i = 0; i < abbrev->num_attrs; ++i)
16349 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
16353 *has_children = abbrev->has_children;
16357 /* Read a die and all its attributes.
16358 Set DIEP to point to a newly allocated die with its information,
16359 except for its child, sibling, and parent fields.
16360 Set HAS_CHILDREN to tell whether the die has children or not. */
16362 static const gdb_byte *
16363 read_full_die (const struct die_reader_specs *reader,
16364 struct die_info **diep, const gdb_byte *info_ptr,
16367 const gdb_byte *result;
16369 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
16371 if (dwarf_die_debug)
16373 fprintf_unfiltered (gdb_stdlog,
16374 "Read die from %s@0x%x of %s:\n",
16375 get_section_name (reader->die_section),
16376 (unsigned) (info_ptr - reader->die_section->buffer),
16377 bfd_get_filename (reader->abfd));
16378 dump_die (*diep, dwarf_die_debug);
16384 /* Abbreviation tables.
16386 In DWARF version 2, the description of the debugging information is
16387 stored in a separate .debug_abbrev section. Before we read any
16388 dies from a section we read in all abbreviations and install them
16389 in a hash table. */
16391 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
16393 static struct abbrev_info *
16394 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
16396 struct abbrev_info *abbrev;
16398 abbrev = XOBNEW (&abbrev_table->abbrev_obstack, struct abbrev_info);
16399 memset (abbrev, 0, sizeof (struct abbrev_info));
16404 /* Add an abbreviation to the table. */
16407 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
16408 unsigned int abbrev_number,
16409 struct abbrev_info *abbrev)
16411 unsigned int hash_number;
16413 hash_number = abbrev_number % ABBREV_HASH_SIZE;
16414 abbrev->next = abbrev_table->abbrevs[hash_number];
16415 abbrev_table->abbrevs[hash_number] = abbrev;
16418 /* Look up an abbrev in the table.
16419 Returns NULL if the abbrev is not found. */
16421 static struct abbrev_info *
16422 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
16423 unsigned int abbrev_number)
16425 unsigned int hash_number;
16426 struct abbrev_info *abbrev;
16428 hash_number = abbrev_number % ABBREV_HASH_SIZE;
16429 abbrev = abbrev_table->abbrevs[hash_number];
16433 if (abbrev->number == abbrev_number)
16435 abbrev = abbrev->next;
16440 /* Read in an abbrev table. */
16442 static struct abbrev_table *
16443 abbrev_table_read_table (struct dwarf2_section_info *section,
16444 sect_offset sect_off)
16446 struct objfile *objfile = dwarf2_per_objfile->objfile;
16447 bfd *abfd = get_section_bfd_owner (section);
16448 struct abbrev_table *abbrev_table;
16449 const gdb_byte *abbrev_ptr;
16450 struct abbrev_info *cur_abbrev;
16451 unsigned int abbrev_number, bytes_read, abbrev_name;
16452 unsigned int abbrev_form;
16453 struct attr_abbrev *cur_attrs;
16454 unsigned int allocated_attrs;
16456 abbrev_table = XNEW (struct abbrev_table);
16457 abbrev_table->sect_off = sect_off;
16458 obstack_init (&abbrev_table->abbrev_obstack);
16459 abbrev_table->abbrevs =
16460 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct abbrev_info *,
16462 memset (abbrev_table->abbrevs, 0,
16463 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
16465 dwarf2_read_section (objfile, section);
16466 abbrev_ptr = section->buffer + to_underlying (sect_off);
16467 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
16468 abbrev_ptr += bytes_read;
16470 allocated_attrs = ATTR_ALLOC_CHUNK;
16471 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
16473 /* Loop until we reach an abbrev number of 0. */
16474 while (abbrev_number)
16476 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
16478 /* read in abbrev header */
16479 cur_abbrev->number = abbrev_number;
16481 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
16482 abbrev_ptr += bytes_read;
16483 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
16486 /* now read in declarations */
16489 LONGEST implicit_const;
16491 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
16492 abbrev_ptr += bytes_read;
16493 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
16494 abbrev_ptr += bytes_read;
16495 if (abbrev_form == DW_FORM_implicit_const)
16497 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
16499 abbrev_ptr += bytes_read;
16503 /* Initialize it due to a false compiler warning. */
16504 implicit_const = -1;
16507 if (abbrev_name == 0)
16510 if (cur_abbrev->num_attrs == allocated_attrs)
16512 allocated_attrs += ATTR_ALLOC_CHUNK;
16514 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
16517 cur_attrs[cur_abbrev->num_attrs].name
16518 = (enum dwarf_attribute) abbrev_name;
16519 cur_attrs[cur_abbrev->num_attrs].form
16520 = (enum dwarf_form) abbrev_form;
16521 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
16522 ++cur_abbrev->num_attrs;
16525 cur_abbrev->attrs =
16526 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
16527 cur_abbrev->num_attrs);
16528 memcpy (cur_abbrev->attrs, cur_attrs,
16529 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
16531 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
16533 /* Get next abbreviation.
16534 Under Irix6 the abbreviations for a compilation unit are not
16535 always properly terminated with an abbrev number of 0.
16536 Exit loop if we encounter an abbreviation which we have
16537 already read (which means we are about to read the abbreviations
16538 for the next compile unit) or if the end of the abbreviation
16539 table is reached. */
16540 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
16542 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
16543 abbrev_ptr += bytes_read;
16544 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
16549 return abbrev_table;
16552 /* Free the resources held by ABBREV_TABLE. */
16555 abbrev_table_free (struct abbrev_table *abbrev_table)
16557 obstack_free (&abbrev_table->abbrev_obstack, NULL);
16558 xfree (abbrev_table);
16561 /* Same as abbrev_table_free but as a cleanup.
16562 We pass in a pointer to the pointer to the table so that we can
16563 set the pointer to NULL when we're done. It also simplifies
16564 build_type_psymtabs_1. */
16567 abbrev_table_free_cleanup (void *table_ptr)
16569 struct abbrev_table **abbrev_table_ptr = (struct abbrev_table **) table_ptr;
16571 if (*abbrev_table_ptr != NULL)
16572 abbrev_table_free (*abbrev_table_ptr);
16573 *abbrev_table_ptr = NULL;
16576 /* Read the abbrev table for CU from ABBREV_SECTION. */
16579 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
16580 struct dwarf2_section_info *abbrev_section)
16583 abbrev_table_read_table (abbrev_section, cu->header.abbrev_sect_off);
16586 /* Release the memory used by the abbrev table for a compilation unit. */
16589 dwarf2_free_abbrev_table (void *ptr_to_cu)
16591 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr_to_cu;
16593 if (cu->abbrev_table != NULL)
16594 abbrev_table_free (cu->abbrev_table);
16595 /* Set this to NULL so that we SEGV if we try to read it later,
16596 and also because free_comp_unit verifies this is NULL. */
16597 cu->abbrev_table = NULL;
16600 /* Returns nonzero if TAG represents a type that we might generate a partial
16604 is_type_tag_for_partial (int tag)
16609 /* Some types that would be reasonable to generate partial symbols for,
16610 that we don't at present. */
16611 case DW_TAG_array_type:
16612 case DW_TAG_file_type:
16613 case DW_TAG_ptr_to_member_type:
16614 case DW_TAG_set_type:
16615 case DW_TAG_string_type:
16616 case DW_TAG_subroutine_type:
16618 case DW_TAG_base_type:
16619 case DW_TAG_class_type:
16620 case DW_TAG_interface_type:
16621 case DW_TAG_enumeration_type:
16622 case DW_TAG_structure_type:
16623 case DW_TAG_subrange_type:
16624 case DW_TAG_typedef:
16625 case DW_TAG_union_type:
16632 /* Load all DIEs that are interesting for partial symbols into memory. */
16634 static struct partial_die_info *
16635 load_partial_dies (const struct die_reader_specs *reader,
16636 const gdb_byte *info_ptr, int building_psymtab)
16638 struct dwarf2_cu *cu = reader->cu;
16639 struct objfile *objfile = cu->objfile;
16640 struct partial_die_info *part_die;
16641 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
16642 struct abbrev_info *abbrev;
16643 unsigned int bytes_read;
16644 unsigned int load_all = 0;
16645 int nesting_level = 1;
16650 gdb_assert (cu->per_cu != NULL);
16651 if (cu->per_cu->load_all_dies)
16655 = htab_create_alloc_ex (cu->header.length / 12,
16659 &cu->comp_unit_obstack,
16660 hashtab_obstack_allocate,
16661 dummy_obstack_deallocate);
16663 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
16667 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
16669 /* A NULL abbrev means the end of a series of children. */
16670 if (abbrev == NULL)
16672 if (--nesting_level == 0)
16674 /* PART_DIE was probably the last thing allocated on the
16675 comp_unit_obstack, so we could call obstack_free
16676 here. We don't do that because the waste is small,
16677 and will be cleaned up when we're done with this
16678 compilation unit. This way, we're also more robust
16679 against other users of the comp_unit_obstack. */
16682 info_ptr += bytes_read;
16683 last_die = parent_die;
16684 parent_die = parent_die->die_parent;
16688 /* Check for template arguments. We never save these; if
16689 they're seen, we just mark the parent, and go on our way. */
16690 if (parent_die != NULL
16691 && cu->language == language_cplus
16692 && (abbrev->tag == DW_TAG_template_type_param
16693 || abbrev->tag == DW_TAG_template_value_param))
16695 parent_die->has_template_arguments = 1;
16699 /* We don't need a partial DIE for the template argument. */
16700 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16705 /* We only recurse into c++ subprograms looking for template arguments.
16706 Skip their other children. */
16708 && cu->language == language_cplus
16709 && parent_die != NULL
16710 && parent_die->tag == DW_TAG_subprogram)
16712 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16716 /* Check whether this DIE is interesting enough to save. Normally
16717 we would not be interested in members here, but there may be
16718 later variables referencing them via DW_AT_specification (for
16719 static members). */
16721 && !is_type_tag_for_partial (abbrev->tag)
16722 && abbrev->tag != DW_TAG_constant
16723 && abbrev->tag != DW_TAG_enumerator
16724 && abbrev->tag != DW_TAG_subprogram
16725 && abbrev->tag != DW_TAG_lexical_block
16726 && abbrev->tag != DW_TAG_variable
16727 && abbrev->tag != DW_TAG_namespace
16728 && abbrev->tag != DW_TAG_module
16729 && abbrev->tag != DW_TAG_member
16730 && abbrev->tag != DW_TAG_imported_unit
16731 && abbrev->tag != DW_TAG_imported_declaration)
16733 /* Otherwise we skip to the next sibling, if any. */
16734 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16738 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
16741 /* This two-pass algorithm for processing partial symbols has a
16742 high cost in cache pressure. Thus, handle some simple cases
16743 here which cover the majority of C partial symbols. DIEs
16744 which neither have specification tags in them, nor could have
16745 specification tags elsewhere pointing at them, can simply be
16746 processed and discarded.
16748 This segment is also optional; scan_partial_symbols and
16749 add_partial_symbol will handle these DIEs if we chain
16750 them in normally. When compilers which do not emit large
16751 quantities of duplicate debug information are more common,
16752 this code can probably be removed. */
16754 /* Any complete simple types at the top level (pretty much all
16755 of them, for a language without namespaces), can be processed
16757 if (parent_die == NULL
16758 && part_die->has_specification == 0
16759 && part_die->is_declaration == 0
16760 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
16761 || part_die->tag == DW_TAG_base_type
16762 || part_die->tag == DW_TAG_subrange_type))
16764 if (building_psymtab && part_die->name != NULL)
16765 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16766 VAR_DOMAIN, LOC_TYPEDEF,
16767 &objfile->static_psymbols,
16768 0, cu->language, objfile);
16769 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16773 /* The exception for DW_TAG_typedef with has_children above is
16774 a workaround of GCC PR debug/47510. In the case of this complaint
16775 type_name_no_tag_or_error will error on such types later.
16777 GDB skipped children of DW_TAG_typedef by the shortcut above and then
16778 it could not find the child DIEs referenced later, this is checked
16779 above. In correct DWARF DW_TAG_typedef should have no children. */
16781 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
16782 complaint (&symfile_complaints,
16783 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
16784 "- DIE at 0x%x [in module %s]"),
16785 to_underlying (part_die->sect_off), objfile_name (objfile));
16787 /* If we're at the second level, and we're an enumerator, and
16788 our parent has no specification (meaning possibly lives in a
16789 namespace elsewhere), then we can add the partial symbol now
16790 instead of queueing it. */
16791 if (part_die->tag == DW_TAG_enumerator
16792 && parent_die != NULL
16793 && parent_die->die_parent == NULL
16794 && parent_die->tag == DW_TAG_enumeration_type
16795 && parent_die->has_specification == 0)
16797 if (part_die->name == NULL)
16798 complaint (&symfile_complaints,
16799 _("malformed enumerator DIE ignored"));
16800 else if (building_psymtab)
16801 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
16802 VAR_DOMAIN, LOC_CONST,
16803 cu->language == language_cplus
16804 ? &objfile->global_psymbols
16805 : &objfile->static_psymbols,
16806 0, cu->language, objfile);
16808 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
16812 /* We'll save this DIE so link it in. */
16813 part_die->die_parent = parent_die;
16814 part_die->die_sibling = NULL;
16815 part_die->die_child = NULL;
16817 if (last_die && last_die == parent_die)
16818 last_die->die_child = part_die;
16820 last_die->die_sibling = part_die;
16822 last_die = part_die;
16824 if (first_die == NULL)
16825 first_die = part_die;
16827 /* Maybe add the DIE to the hash table. Not all DIEs that we
16828 find interesting need to be in the hash table, because we
16829 also have the parent/sibling/child chains; only those that we
16830 might refer to by offset later during partial symbol reading.
16832 For now this means things that might have be the target of a
16833 DW_AT_specification, DW_AT_abstract_origin, or
16834 DW_AT_extension. DW_AT_extension will refer only to
16835 namespaces; DW_AT_abstract_origin refers to functions (and
16836 many things under the function DIE, but we do not recurse
16837 into function DIEs during partial symbol reading) and
16838 possibly variables as well; DW_AT_specification refers to
16839 declarations. Declarations ought to have the DW_AT_declaration
16840 flag. It happens that GCC forgets to put it in sometimes, but
16841 only for functions, not for types.
16843 Adding more things than necessary to the hash table is harmless
16844 except for the performance cost. Adding too few will result in
16845 wasted time in find_partial_die, when we reread the compilation
16846 unit with load_all_dies set. */
16849 || abbrev->tag == DW_TAG_constant
16850 || abbrev->tag == DW_TAG_subprogram
16851 || abbrev->tag == DW_TAG_variable
16852 || abbrev->tag == DW_TAG_namespace
16853 || part_die->is_declaration)
16857 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
16858 to_underlying (part_die->sect_off),
16863 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
16865 /* For some DIEs we want to follow their children (if any). For C
16866 we have no reason to follow the children of structures; for other
16867 languages we have to, so that we can get at method physnames
16868 to infer fully qualified class names, for DW_AT_specification,
16869 and for C++ template arguments. For C++, we also look one level
16870 inside functions to find template arguments (if the name of the
16871 function does not already contain the template arguments).
16873 For Ada, we need to scan the children of subprograms and lexical
16874 blocks as well because Ada allows the definition of nested
16875 entities that could be interesting for the debugger, such as
16876 nested subprograms for instance. */
16877 if (last_die->has_children
16879 || last_die->tag == DW_TAG_namespace
16880 || last_die->tag == DW_TAG_module
16881 || last_die->tag == DW_TAG_enumeration_type
16882 || (cu->language == language_cplus
16883 && last_die->tag == DW_TAG_subprogram
16884 && (last_die->name == NULL
16885 || strchr (last_die->name, '<') == NULL))
16886 || (cu->language != language_c
16887 && (last_die->tag == DW_TAG_class_type
16888 || last_die->tag == DW_TAG_interface_type
16889 || last_die->tag == DW_TAG_structure_type
16890 || last_die->tag == DW_TAG_union_type))
16891 || (cu->language == language_ada
16892 && (last_die->tag == DW_TAG_subprogram
16893 || last_die->tag == DW_TAG_lexical_block))))
16896 parent_die = last_die;
16900 /* Otherwise we skip to the next sibling, if any. */
16901 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
16903 /* Back to the top, do it again. */
16907 /* Read a minimal amount of information into the minimal die structure. */
16909 static const gdb_byte *
16910 read_partial_die (const struct die_reader_specs *reader,
16911 struct partial_die_info *part_die,
16912 struct abbrev_info *abbrev, unsigned int abbrev_len,
16913 const gdb_byte *info_ptr)
16915 struct dwarf2_cu *cu = reader->cu;
16916 struct objfile *objfile = cu->objfile;
16917 const gdb_byte *buffer = reader->buffer;
16919 struct attribute attr;
16920 int has_low_pc_attr = 0;
16921 int has_high_pc_attr = 0;
16922 int high_pc_relative = 0;
16924 memset (part_die, 0, sizeof (struct partial_die_info));
16926 part_die->sect_off = (sect_offset) (info_ptr - buffer);
16928 info_ptr += abbrev_len;
16930 if (abbrev == NULL)
16933 part_die->tag = abbrev->tag;
16934 part_die->has_children = abbrev->has_children;
16936 for (i = 0; i < abbrev->num_attrs; ++i)
16938 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
16940 /* Store the data if it is of an attribute we want to keep in a
16941 partial symbol table. */
16945 switch (part_die->tag)
16947 case DW_TAG_compile_unit:
16948 case DW_TAG_partial_unit:
16949 case DW_TAG_type_unit:
16950 /* Compilation units have a DW_AT_name that is a filename, not
16951 a source language identifier. */
16952 case DW_TAG_enumeration_type:
16953 case DW_TAG_enumerator:
16954 /* These tags always have simple identifiers already; no need
16955 to canonicalize them. */
16956 part_die->name = DW_STRING (&attr);
16960 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
16961 &objfile->per_bfd->storage_obstack);
16965 case DW_AT_linkage_name:
16966 case DW_AT_MIPS_linkage_name:
16967 /* Note that both forms of linkage name might appear. We
16968 assume they will be the same, and we only store the last
16970 if (cu->language == language_ada)
16971 part_die->name = DW_STRING (&attr);
16972 part_die->linkage_name = DW_STRING (&attr);
16975 has_low_pc_attr = 1;
16976 part_die->lowpc = attr_value_as_address (&attr);
16978 case DW_AT_high_pc:
16979 has_high_pc_attr = 1;
16980 part_die->highpc = attr_value_as_address (&attr);
16981 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
16982 high_pc_relative = 1;
16984 case DW_AT_location:
16985 /* Support the .debug_loc offsets. */
16986 if (attr_form_is_block (&attr))
16988 part_die->d.locdesc = DW_BLOCK (&attr);
16990 else if (attr_form_is_section_offset (&attr))
16992 dwarf2_complex_location_expr_complaint ();
16996 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16997 "partial symbol information");
17000 case DW_AT_external:
17001 part_die->is_external = DW_UNSND (&attr);
17003 case DW_AT_declaration:
17004 part_die->is_declaration = DW_UNSND (&attr);
17007 part_die->has_type = 1;
17009 case DW_AT_abstract_origin:
17010 case DW_AT_specification:
17011 case DW_AT_extension:
17012 part_die->has_specification = 1;
17013 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
17014 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
17015 || cu->per_cu->is_dwz);
17017 case DW_AT_sibling:
17018 /* Ignore absolute siblings, they might point outside of
17019 the current compile unit. */
17020 if (attr.form == DW_FORM_ref_addr)
17021 complaint (&symfile_complaints,
17022 _("ignoring absolute DW_AT_sibling"));
17025 sect_offset off = dwarf2_get_ref_die_offset (&attr);
17026 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
17028 if (sibling_ptr < info_ptr)
17029 complaint (&symfile_complaints,
17030 _("DW_AT_sibling points backwards"));
17031 else if (sibling_ptr > reader->buffer_end)
17032 dwarf2_section_buffer_overflow_complaint (reader->die_section);
17034 part_die->sibling = sibling_ptr;
17037 case DW_AT_byte_size:
17038 part_die->has_byte_size = 1;
17040 case DW_AT_const_value:
17041 part_die->has_const_value = 1;
17043 case DW_AT_calling_convention:
17044 /* DWARF doesn't provide a way to identify a program's source-level
17045 entry point. DW_AT_calling_convention attributes are only meant
17046 to describe functions' calling conventions.
17048 However, because it's a necessary piece of information in
17049 Fortran, and before DWARF 4 DW_CC_program was the only
17050 piece of debugging information whose definition refers to
17051 a 'main program' at all, several compilers marked Fortran
17052 main programs with DW_CC_program --- even when those
17053 functions use the standard calling conventions.
17055 Although DWARF now specifies a way to provide this
17056 information, we support this practice for backward
17058 if (DW_UNSND (&attr) == DW_CC_program
17059 && cu->language == language_fortran)
17060 part_die->main_subprogram = 1;
17063 if (DW_UNSND (&attr) == DW_INL_inlined
17064 || DW_UNSND (&attr) == DW_INL_declared_inlined)
17065 part_die->may_be_inlined = 1;
17069 if (part_die->tag == DW_TAG_imported_unit)
17071 part_die->d.sect_off = dwarf2_get_ref_die_offset (&attr);
17072 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
17073 || cu->per_cu->is_dwz);
17077 case DW_AT_main_subprogram:
17078 part_die->main_subprogram = DW_UNSND (&attr);
17086 if (high_pc_relative)
17087 part_die->highpc += part_die->lowpc;
17089 if (has_low_pc_attr && has_high_pc_attr)
17091 /* When using the GNU linker, .gnu.linkonce. sections are used to
17092 eliminate duplicate copies of functions and vtables and such.
17093 The linker will arbitrarily choose one and discard the others.
17094 The AT_*_pc values for such functions refer to local labels in
17095 these sections. If the section from that file was discarded, the
17096 labels are not in the output, so the relocs get a value of 0.
17097 If this is a discarded function, mark the pc bounds as invalid,
17098 so that GDB will ignore it. */
17099 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
17101 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17103 complaint (&symfile_complaints,
17104 _("DW_AT_low_pc %s is zero "
17105 "for DIE at 0x%x [in module %s]"),
17106 paddress (gdbarch, part_die->lowpc),
17107 to_underlying (part_die->sect_off), objfile_name (objfile));
17109 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
17110 else if (part_die->lowpc >= part_die->highpc)
17112 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17114 complaint (&symfile_complaints,
17115 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
17116 "for DIE at 0x%x [in module %s]"),
17117 paddress (gdbarch, part_die->lowpc),
17118 paddress (gdbarch, part_die->highpc),
17119 to_underlying (part_die->sect_off),
17120 objfile_name (objfile));
17123 part_die->has_pc_info = 1;
17129 /* Find a cached partial DIE at OFFSET in CU. */
17131 static struct partial_die_info *
17132 find_partial_die_in_comp_unit (sect_offset sect_off, struct dwarf2_cu *cu)
17134 struct partial_die_info *lookup_die = NULL;
17135 struct partial_die_info part_die;
17137 part_die.sect_off = sect_off;
17138 lookup_die = ((struct partial_die_info *)
17139 htab_find_with_hash (cu->partial_dies, &part_die,
17140 to_underlying (sect_off)));
17145 /* Find a partial DIE at OFFSET, which may or may not be in CU,
17146 except in the case of .debug_types DIEs which do not reference
17147 outside their CU (they do however referencing other types via
17148 DW_FORM_ref_sig8). */
17150 static struct partial_die_info *
17151 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
17153 struct objfile *objfile = cu->objfile;
17154 struct dwarf2_per_cu_data *per_cu = NULL;
17155 struct partial_die_info *pd = NULL;
17157 if (offset_in_dwz == cu->per_cu->is_dwz
17158 && offset_in_cu_p (&cu->header, sect_off))
17160 pd = find_partial_die_in_comp_unit (sect_off, cu);
17163 /* We missed recording what we needed.
17164 Load all dies and try again. */
17165 per_cu = cu->per_cu;
17169 /* TUs don't reference other CUs/TUs (except via type signatures). */
17170 if (cu->per_cu->is_debug_types)
17172 error (_("Dwarf Error: Type Unit at offset 0x%x contains"
17173 " external reference to offset 0x%x [in module %s].\n"),
17174 to_underlying (cu->header.sect_off), to_underlying (sect_off),
17175 bfd_get_filename (objfile->obfd));
17177 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
17180 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
17181 load_partial_comp_unit (per_cu);
17183 per_cu->cu->last_used = 0;
17184 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
17187 /* If we didn't find it, and not all dies have been loaded,
17188 load them all and try again. */
17190 if (pd == NULL && per_cu->load_all_dies == 0)
17192 per_cu->load_all_dies = 1;
17194 /* This is nasty. When we reread the DIEs, somewhere up the call chain
17195 THIS_CU->cu may already be in use. So we can't just free it and
17196 replace its DIEs with the ones we read in. Instead, we leave those
17197 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
17198 and clobber THIS_CU->cu->partial_dies with the hash table for the new
17200 load_partial_comp_unit (per_cu);
17202 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
17206 internal_error (__FILE__, __LINE__,
17207 _("could not find partial DIE 0x%x "
17208 "in cache [from module %s]\n"),
17209 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
17213 /* See if we can figure out if the class lives in a namespace. We do
17214 this by looking for a member function; its demangled name will
17215 contain namespace info, if there is any. */
17218 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
17219 struct dwarf2_cu *cu)
17221 /* NOTE: carlton/2003-10-07: Getting the info this way changes
17222 what template types look like, because the demangler
17223 frequently doesn't give the same name as the debug info. We
17224 could fix this by only using the demangled name to get the
17225 prefix (but see comment in read_structure_type). */
17227 struct partial_die_info *real_pdi;
17228 struct partial_die_info *child_pdi;
17230 /* If this DIE (this DIE's specification, if any) has a parent, then
17231 we should not do this. We'll prepend the parent's fully qualified
17232 name when we create the partial symbol. */
17234 real_pdi = struct_pdi;
17235 while (real_pdi->has_specification)
17236 real_pdi = find_partial_die (real_pdi->spec_offset,
17237 real_pdi->spec_is_dwz, cu);
17239 if (real_pdi->die_parent != NULL)
17242 for (child_pdi = struct_pdi->die_child;
17244 child_pdi = child_pdi->die_sibling)
17246 if (child_pdi->tag == DW_TAG_subprogram
17247 && child_pdi->linkage_name != NULL)
17249 char *actual_class_name
17250 = language_class_name_from_physname (cu->language_defn,
17251 child_pdi->linkage_name);
17252 if (actual_class_name != NULL)
17256 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
17258 strlen (actual_class_name)));
17259 xfree (actual_class_name);
17266 /* Adjust PART_DIE before generating a symbol for it. This function
17267 may set the is_external flag or change the DIE's name. */
17270 fixup_partial_die (struct partial_die_info *part_die,
17271 struct dwarf2_cu *cu)
17273 /* Once we've fixed up a die, there's no point in doing so again.
17274 This also avoids a memory leak if we were to call
17275 guess_partial_die_structure_name multiple times. */
17276 if (part_die->fixup_called)
17279 /* If we found a reference attribute and the DIE has no name, try
17280 to find a name in the referred to DIE. */
17282 if (part_die->name == NULL && part_die->has_specification)
17284 struct partial_die_info *spec_die;
17286 spec_die = find_partial_die (part_die->spec_offset,
17287 part_die->spec_is_dwz, cu);
17289 fixup_partial_die (spec_die, cu);
17291 if (spec_die->name)
17293 part_die->name = spec_die->name;
17295 /* Copy DW_AT_external attribute if it is set. */
17296 if (spec_die->is_external)
17297 part_die->is_external = spec_die->is_external;
17301 /* Set default names for some unnamed DIEs. */
17303 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
17304 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
17306 /* If there is no parent die to provide a namespace, and there are
17307 children, see if we can determine the namespace from their linkage
17309 if (cu->language == language_cplus
17310 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
17311 && part_die->die_parent == NULL
17312 && part_die->has_children
17313 && (part_die->tag == DW_TAG_class_type
17314 || part_die->tag == DW_TAG_structure_type
17315 || part_die->tag == DW_TAG_union_type))
17316 guess_partial_die_structure_name (part_die, cu);
17318 /* GCC might emit a nameless struct or union that has a linkage
17319 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17320 if (part_die->name == NULL
17321 && (part_die->tag == DW_TAG_class_type
17322 || part_die->tag == DW_TAG_interface_type
17323 || part_die->tag == DW_TAG_structure_type
17324 || part_die->tag == DW_TAG_union_type)
17325 && part_die->linkage_name != NULL)
17329 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
17334 /* Strip any leading namespaces/classes, keep only the base name.
17335 DW_AT_name for named DIEs does not contain the prefixes. */
17336 base = strrchr (demangled, ':');
17337 if (base && base > demangled && base[-1] == ':')
17344 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
17345 base, strlen (base)));
17350 part_die->fixup_called = 1;
17353 /* Read an attribute value described by an attribute form. */
17355 static const gdb_byte *
17356 read_attribute_value (const struct die_reader_specs *reader,
17357 struct attribute *attr, unsigned form,
17358 LONGEST implicit_const, const gdb_byte *info_ptr)
17360 struct dwarf2_cu *cu = reader->cu;
17361 struct objfile *objfile = cu->objfile;
17362 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17363 bfd *abfd = reader->abfd;
17364 struct comp_unit_head *cu_header = &cu->header;
17365 unsigned int bytes_read;
17366 struct dwarf_block *blk;
17368 attr->form = (enum dwarf_form) form;
17371 case DW_FORM_ref_addr:
17372 if (cu->header.version == 2)
17373 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
17375 DW_UNSND (attr) = read_offset (abfd, info_ptr,
17376 &cu->header, &bytes_read);
17377 info_ptr += bytes_read;
17379 case DW_FORM_GNU_ref_alt:
17380 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
17381 info_ptr += bytes_read;
17384 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
17385 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
17386 info_ptr += bytes_read;
17388 case DW_FORM_block2:
17389 blk = dwarf_alloc_block (cu);
17390 blk->size = read_2_bytes (abfd, info_ptr);
17392 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
17393 info_ptr += blk->size;
17394 DW_BLOCK (attr) = blk;
17396 case DW_FORM_block4:
17397 blk = dwarf_alloc_block (cu);
17398 blk->size = read_4_bytes (abfd, info_ptr);
17400 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
17401 info_ptr += blk->size;
17402 DW_BLOCK (attr) = blk;
17404 case DW_FORM_data2:
17405 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
17408 case DW_FORM_data4:
17409 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
17412 case DW_FORM_data8:
17413 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
17416 case DW_FORM_data16:
17417 blk = dwarf_alloc_block (cu);
17419 blk->data = read_n_bytes (abfd, info_ptr, 16);
17421 DW_BLOCK (attr) = blk;
17423 case DW_FORM_sec_offset:
17424 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
17425 info_ptr += bytes_read;
17427 case DW_FORM_string:
17428 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
17429 DW_STRING_IS_CANONICAL (attr) = 0;
17430 info_ptr += bytes_read;
17433 if (!cu->per_cu->is_dwz)
17435 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
17437 DW_STRING_IS_CANONICAL (attr) = 0;
17438 info_ptr += bytes_read;
17442 case DW_FORM_line_strp:
17443 if (!cu->per_cu->is_dwz)
17445 DW_STRING (attr) = read_indirect_line_string (abfd, info_ptr,
17446 cu_header, &bytes_read);
17447 DW_STRING_IS_CANONICAL (attr) = 0;
17448 info_ptr += bytes_read;
17452 case DW_FORM_GNU_strp_alt:
17454 struct dwz_file *dwz = dwarf2_get_dwz_file ();
17455 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
17458 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
17459 DW_STRING_IS_CANONICAL (attr) = 0;
17460 info_ptr += bytes_read;
17463 case DW_FORM_exprloc:
17464 case DW_FORM_block:
17465 blk = dwarf_alloc_block (cu);
17466 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17467 info_ptr += bytes_read;
17468 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
17469 info_ptr += blk->size;
17470 DW_BLOCK (attr) = blk;
17472 case DW_FORM_block1:
17473 blk = dwarf_alloc_block (cu);
17474 blk->size = read_1_byte (abfd, info_ptr);
17476 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
17477 info_ptr += blk->size;
17478 DW_BLOCK (attr) = blk;
17480 case DW_FORM_data1:
17481 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
17485 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
17488 case DW_FORM_flag_present:
17489 DW_UNSND (attr) = 1;
17491 case DW_FORM_sdata:
17492 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
17493 info_ptr += bytes_read;
17495 case DW_FORM_udata:
17496 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17497 info_ptr += bytes_read;
17500 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
17501 + read_1_byte (abfd, info_ptr));
17505 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
17506 + read_2_bytes (abfd, info_ptr));
17510 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
17511 + read_4_bytes (abfd, info_ptr));
17515 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
17516 + read_8_bytes (abfd, info_ptr));
17519 case DW_FORM_ref_sig8:
17520 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
17523 case DW_FORM_ref_udata:
17524 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
17525 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
17526 info_ptr += bytes_read;
17528 case DW_FORM_indirect:
17529 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17530 info_ptr += bytes_read;
17531 if (form == DW_FORM_implicit_const)
17533 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
17534 info_ptr += bytes_read;
17536 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
17539 case DW_FORM_implicit_const:
17540 DW_SND (attr) = implicit_const;
17542 case DW_FORM_GNU_addr_index:
17543 if (reader->dwo_file == NULL)
17545 /* For now flag a hard error.
17546 Later we can turn this into a complaint. */
17547 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
17548 dwarf_form_name (form),
17549 bfd_get_filename (abfd));
17551 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
17552 info_ptr += bytes_read;
17554 case DW_FORM_GNU_str_index:
17555 if (reader->dwo_file == NULL)
17557 /* For now flag a hard error.
17558 Later we can turn this into a complaint if warranted. */
17559 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
17560 dwarf_form_name (form),
17561 bfd_get_filename (abfd));
17564 ULONGEST str_index =
17565 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17567 DW_STRING (attr) = read_str_index (reader, str_index);
17568 DW_STRING_IS_CANONICAL (attr) = 0;
17569 info_ptr += bytes_read;
17573 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
17574 dwarf_form_name (form),
17575 bfd_get_filename (abfd));
17579 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
17580 attr->form = DW_FORM_GNU_ref_alt;
17582 /* We have seen instances where the compiler tried to emit a byte
17583 size attribute of -1 which ended up being encoded as an unsigned
17584 0xffffffff. Although 0xffffffff is technically a valid size value,
17585 an object of this size seems pretty unlikely so we can relatively
17586 safely treat these cases as if the size attribute was invalid and
17587 treat them as zero by default. */
17588 if (attr->name == DW_AT_byte_size
17589 && form == DW_FORM_data4
17590 && DW_UNSND (attr) >= 0xffffffff)
17593 (&symfile_complaints,
17594 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
17595 hex_string (DW_UNSND (attr)));
17596 DW_UNSND (attr) = 0;
17602 /* Read an attribute described by an abbreviated attribute. */
17604 static const gdb_byte *
17605 read_attribute (const struct die_reader_specs *reader,
17606 struct attribute *attr, struct attr_abbrev *abbrev,
17607 const gdb_byte *info_ptr)
17609 attr->name = abbrev->name;
17610 return read_attribute_value (reader, attr, abbrev->form,
17611 abbrev->implicit_const, info_ptr);
17614 /* Read dwarf information from a buffer. */
17616 static unsigned int
17617 read_1_byte (bfd *abfd, const gdb_byte *buf)
17619 return bfd_get_8 (abfd, buf);
17623 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
17625 return bfd_get_signed_8 (abfd, buf);
17628 static unsigned int
17629 read_2_bytes (bfd *abfd, const gdb_byte *buf)
17631 return bfd_get_16 (abfd, buf);
17635 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
17637 return bfd_get_signed_16 (abfd, buf);
17640 static unsigned int
17641 read_4_bytes (bfd *abfd, const gdb_byte *buf)
17643 return bfd_get_32 (abfd, buf);
17647 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
17649 return bfd_get_signed_32 (abfd, buf);
17653 read_8_bytes (bfd *abfd, const gdb_byte *buf)
17655 return bfd_get_64 (abfd, buf);
17659 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
17660 unsigned int *bytes_read)
17662 struct comp_unit_head *cu_header = &cu->header;
17663 CORE_ADDR retval = 0;
17665 if (cu_header->signed_addr_p)
17667 switch (cu_header->addr_size)
17670 retval = bfd_get_signed_16 (abfd, buf);
17673 retval = bfd_get_signed_32 (abfd, buf);
17676 retval = bfd_get_signed_64 (abfd, buf);
17679 internal_error (__FILE__, __LINE__,
17680 _("read_address: bad switch, signed [in module %s]"),
17681 bfd_get_filename (abfd));
17686 switch (cu_header->addr_size)
17689 retval = bfd_get_16 (abfd, buf);
17692 retval = bfd_get_32 (abfd, buf);
17695 retval = bfd_get_64 (abfd, buf);
17698 internal_error (__FILE__, __LINE__,
17699 _("read_address: bad switch, "
17700 "unsigned [in module %s]"),
17701 bfd_get_filename (abfd));
17705 *bytes_read = cu_header->addr_size;
17709 /* Read the initial length from a section. The (draft) DWARF 3
17710 specification allows the initial length to take up either 4 bytes
17711 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
17712 bytes describe the length and all offsets will be 8 bytes in length
17715 An older, non-standard 64-bit format is also handled by this
17716 function. The older format in question stores the initial length
17717 as an 8-byte quantity without an escape value. Lengths greater
17718 than 2^32 aren't very common which means that the initial 4 bytes
17719 is almost always zero. Since a length value of zero doesn't make
17720 sense for the 32-bit format, this initial zero can be considered to
17721 be an escape value which indicates the presence of the older 64-bit
17722 format. As written, the code can't detect (old format) lengths
17723 greater than 4GB. If it becomes necessary to handle lengths
17724 somewhat larger than 4GB, we could allow other small values (such
17725 as the non-sensical values of 1, 2, and 3) to also be used as
17726 escape values indicating the presence of the old format.
17728 The value returned via bytes_read should be used to increment the
17729 relevant pointer after calling read_initial_length().
17731 [ Note: read_initial_length() and read_offset() are based on the
17732 document entitled "DWARF Debugging Information Format", revision
17733 3, draft 8, dated November 19, 2001. This document was obtained
17736 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
17738 This document is only a draft and is subject to change. (So beware.)
17740 Details regarding the older, non-standard 64-bit format were
17741 determined empirically by examining 64-bit ELF files produced by
17742 the SGI toolchain on an IRIX 6.5 machine.
17744 - Kevin, July 16, 2002
17748 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
17750 LONGEST length = bfd_get_32 (abfd, buf);
17752 if (length == 0xffffffff)
17754 length = bfd_get_64 (abfd, buf + 4);
17757 else if (length == 0)
17759 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
17760 length = bfd_get_64 (abfd, buf);
17771 /* Cover function for read_initial_length.
17772 Returns the length of the object at BUF, and stores the size of the
17773 initial length in *BYTES_READ and stores the size that offsets will be in
17775 If the initial length size is not equivalent to that specified in
17776 CU_HEADER then issue a complaint.
17777 This is useful when reading non-comp-unit headers. */
17780 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
17781 const struct comp_unit_head *cu_header,
17782 unsigned int *bytes_read,
17783 unsigned int *offset_size)
17785 LONGEST length = read_initial_length (abfd, buf, bytes_read);
17787 gdb_assert (cu_header->initial_length_size == 4
17788 || cu_header->initial_length_size == 8
17789 || cu_header->initial_length_size == 12);
17791 if (cu_header->initial_length_size != *bytes_read)
17792 complaint (&symfile_complaints,
17793 _("intermixed 32-bit and 64-bit DWARF sections"));
17795 *offset_size = (*bytes_read == 4) ? 4 : 8;
17799 /* Read an offset from the data stream. The size of the offset is
17800 given by cu_header->offset_size. */
17803 read_offset (bfd *abfd, const gdb_byte *buf,
17804 const struct comp_unit_head *cu_header,
17805 unsigned int *bytes_read)
17807 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
17809 *bytes_read = cu_header->offset_size;
17813 /* Read an offset from the data stream. */
17816 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
17818 LONGEST retval = 0;
17820 switch (offset_size)
17823 retval = bfd_get_32 (abfd, buf);
17826 retval = bfd_get_64 (abfd, buf);
17829 internal_error (__FILE__, __LINE__,
17830 _("read_offset_1: bad switch [in module %s]"),
17831 bfd_get_filename (abfd));
17837 static const gdb_byte *
17838 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
17840 /* If the size of a host char is 8 bits, we can return a pointer
17841 to the buffer, otherwise we have to copy the data to a buffer
17842 allocated on the temporary obstack. */
17843 gdb_assert (HOST_CHAR_BIT == 8);
17847 static const char *
17848 read_direct_string (bfd *abfd, const gdb_byte *buf,
17849 unsigned int *bytes_read_ptr)
17851 /* If the size of a host char is 8 bits, we can return a pointer
17852 to the string, otherwise we have to copy the string to a buffer
17853 allocated on the temporary obstack. */
17854 gdb_assert (HOST_CHAR_BIT == 8);
17857 *bytes_read_ptr = 1;
17860 *bytes_read_ptr = strlen ((const char *) buf) + 1;
17861 return (const char *) buf;
17864 /* Return pointer to string at section SECT offset STR_OFFSET with error
17865 reporting strings FORM_NAME and SECT_NAME. */
17867 static const char *
17868 read_indirect_string_at_offset_from (bfd *abfd, LONGEST str_offset,
17869 struct dwarf2_section_info *sect,
17870 const char *form_name,
17871 const char *sect_name)
17873 dwarf2_read_section (dwarf2_per_objfile->objfile, sect);
17874 if (sect->buffer == NULL)
17875 error (_("%s used without %s section [in module %s]"),
17876 form_name, sect_name, bfd_get_filename (abfd));
17877 if (str_offset >= sect->size)
17878 error (_("%s pointing outside of %s section [in module %s]"),
17879 form_name, sect_name, bfd_get_filename (abfd));
17880 gdb_assert (HOST_CHAR_BIT == 8);
17881 if (sect->buffer[str_offset] == '\0')
17883 return (const char *) (sect->buffer + str_offset);
17886 /* Return pointer to string at .debug_str offset STR_OFFSET. */
17888 static const char *
17889 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
17891 return read_indirect_string_at_offset_from (abfd, str_offset,
17892 &dwarf2_per_objfile->str,
17893 "DW_FORM_strp", ".debug_str");
17896 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
17898 static const char *
17899 read_indirect_line_string_at_offset (bfd *abfd, LONGEST str_offset)
17901 return read_indirect_string_at_offset_from (abfd, str_offset,
17902 &dwarf2_per_objfile->line_str,
17903 "DW_FORM_line_strp",
17904 ".debug_line_str");
17907 /* Read a string at offset STR_OFFSET in the .debug_str section from
17908 the .dwz file DWZ. Throw an error if the offset is too large. If
17909 the string consists of a single NUL byte, return NULL; otherwise
17910 return a pointer to the string. */
17912 static const char *
17913 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
17915 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
17917 if (dwz->str.buffer == NULL)
17918 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
17919 "section [in module %s]"),
17920 bfd_get_filename (dwz->dwz_bfd));
17921 if (str_offset >= dwz->str.size)
17922 error (_("DW_FORM_GNU_strp_alt pointing outside of "
17923 ".debug_str section [in module %s]"),
17924 bfd_get_filename (dwz->dwz_bfd));
17925 gdb_assert (HOST_CHAR_BIT == 8);
17926 if (dwz->str.buffer[str_offset] == '\0')
17928 return (const char *) (dwz->str.buffer + str_offset);
17931 /* Return pointer to string at .debug_str offset as read from BUF.
17932 BUF is assumed to be in a compilation unit described by CU_HEADER.
17933 Return *BYTES_READ_PTR count of bytes read from BUF. */
17935 static const char *
17936 read_indirect_string (bfd *abfd, const gdb_byte *buf,
17937 const struct comp_unit_head *cu_header,
17938 unsigned int *bytes_read_ptr)
17940 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17942 return read_indirect_string_at_offset (abfd, str_offset);
17945 /* Return pointer to string at .debug_line_str offset as read from BUF.
17946 BUF is assumed to be in a compilation unit described by CU_HEADER.
17947 Return *BYTES_READ_PTR count of bytes read from BUF. */
17949 static const char *
17950 read_indirect_line_string (bfd *abfd, const gdb_byte *buf,
17951 const struct comp_unit_head *cu_header,
17952 unsigned int *bytes_read_ptr)
17954 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
17956 return read_indirect_line_string_at_offset (abfd, str_offset);
17960 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
17961 unsigned int *bytes_read_ptr)
17964 unsigned int num_read;
17966 unsigned char byte;
17973 byte = bfd_get_8 (abfd, buf);
17976 result |= ((ULONGEST) (byte & 127) << shift);
17977 if ((byte & 128) == 0)
17983 *bytes_read_ptr = num_read;
17988 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
17989 unsigned int *bytes_read_ptr)
17992 int shift, num_read;
17993 unsigned char byte;
18000 byte = bfd_get_8 (abfd, buf);
18003 result |= ((LONGEST) (byte & 127) << shift);
18005 if ((byte & 128) == 0)
18010 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
18011 result |= -(((LONGEST) 1) << shift);
18012 *bytes_read_ptr = num_read;
18016 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
18017 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
18018 ADDR_SIZE is the size of addresses from the CU header. */
18021 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
18023 struct objfile *objfile = dwarf2_per_objfile->objfile;
18024 bfd *abfd = objfile->obfd;
18025 const gdb_byte *info_ptr;
18027 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
18028 if (dwarf2_per_objfile->addr.buffer == NULL)
18029 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
18030 objfile_name (objfile));
18031 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
18032 error (_("DW_FORM_addr_index pointing outside of "
18033 ".debug_addr section [in module %s]"),
18034 objfile_name (objfile));
18035 info_ptr = (dwarf2_per_objfile->addr.buffer
18036 + addr_base + addr_index * addr_size);
18037 if (addr_size == 4)
18038 return bfd_get_32 (abfd, info_ptr);
18040 return bfd_get_64 (abfd, info_ptr);
18043 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
18046 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
18048 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
18051 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
18054 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
18055 unsigned int *bytes_read)
18057 bfd *abfd = cu->objfile->obfd;
18058 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
18060 return read_addr_index (cu, addr_index);
18063 /* Data structure to pass results from dwarf2_read_addr_index_reader
18064 back to dwarf2_read_addr_index. */
18066 struct dwarf2_read_addr_index_data
18068 ULONGEST addr_base;
18072 /* die_reader_func for dwarf2_read_addr_index. */
18075 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
18076 const gdb_byte *info_ptr,
18077 struct die_info *comp_unit_die,
18081 struct dwarf2_cu *cu = reader->cu;
18082 struct dwarf2_read_addr_index_data *aidata =
18083 (struct dwarf2_read_addr_index_data *) data;
18085 aidata->addr_base = cu->addr_base;
18086 aidata->addr_size = cu->header.addr_size;
18089 /* Given an index in .debug_addr, fetch the value.
18090 NOTE: This can be called during dwarf expression evaluation,
18091 long after the debug information has been read, and thus per_cu->cu
18092 may no longer exist. */
18095 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
18096 unsigned int addr_index)
18098 struct objfile *objfile = per_cu->objfile;
18099 struct dwarf2_cu *cu = per_cu->cu;
18100 ULONGEST addr_base;
18103 /* This is intended to be called from outside this file. */
18104 dw2_setup (objfile);
18106 /* We need addr_base and addr_size.
18107 If we don't have PER_CU->cu, we have to get it.
18108 Nasty, but the alternative is storing the needed info in PER_CU,
18109 which at this point doesn't seem justified: it's not clear how frequently
18110 it would get used and it would increase the size of every PER_CU.
18111 Entry points like dwarf2_per_cu_addr_size do a similar thing
18112 so we're not in uncharted territory here.
18113 Alas we need to be a bit more complicated as addr_base is contained
18116 We don't need to read the entire CU(/TU).
18117 We just need the header and top level die.
18119 IWBN to use the aging mechanism to let us lazily later discard the CU.
18120 For now we skip this optimization. */
18124 addr_base = cu->addr_base;
18125 addr_size = cu->header.addr_size;
18129 struct dwarf2_read_addr_index_data aidata;
18131 /* Note: We can't use init_cutu_and_read_dies_simple here,
18132 we need addr_base. */
18133 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
18134 dwarf2_read_addr_index_reader, &aidata);
18135 addr_base = aidata.addr_base;
18136 addr_size = aidata.addr_size;
18139 return read_addr_index_1 (addr_index, addr_base, addr_size);
18142 /* Given a DW_FORM_GNU_str_index, fetch the string.
18143 This is only used by the Fission support. */
18145 static const char *
18146 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
18148 struct objfile *objfile = dwarf2_per_objfile->objfile;
18149 const char *objf_name = objfile_name (objfile);
18150 bfd *abfd = objfile->obfd;
18151 struct dwarf2_cu *cu = reader->cu;
18152 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
18153 struct dwarf2_section_info *str_offsets_section =
18154 &reader->dwo_file->sections.str_offsets;
18155 const gdb_byte *info_ptr;
18156 ULONGEST str_offset;
18157 static const char form_name[] = "DW_FORM_GNU_str_index";
18159 dwarf2_read_section (objfile, str_section);
18160 dwarf2_read_section (objfile, str_offsets_section);
18161 if (str_section->buffer == NULL)
18162 error (_("%s used without .debug_str.dwo section"
18163 " in CU at offset 0x%x [in module %s]"),
18164 form_name, to_underlying (cu->header.sect_off), objf_name);
18165 if (str_offsets_section->buffer == NULL)
18166 error (_("%s used without .debug_str_offsets.dwo section"
18167 " in CU at offset 0x%x [in module %s]"),
18168 form_name, to_underlying (cu->header.sect_off), objf_name);
18169 if (str_index * cu->header.offset_size >= str_offsets_section->size)
18170 error (_("%s pointing outside of .debug_str_offsets.dwo"
18171 " section in CU at offset 0x%x [in module %s]"),
18172 form_name, to_underlying (cu->header.sect_off), objf_name);
18173 info_ptr = (str_offsets_section->buffer
18174 + str_index * cu->header.offset_size);
18175 if (cu->header.offset_size == 4)
18176 str_offset = bfd_get_32 (abfd, info_ptr);
18178 str_offset = bfd_get_64 (abfd, info_ptr);
18179 if (str_offset >= str_section->size)
18180 error (_("Offset from %s pointing outside of"
18181 " .debug_str.dwo section in CU at offset 0x%x [in module %s]"),
18182 form_name, to_underlying (cu->header.sect_off), objf_name);
18183 return (const char *) (str_section->buffer + str_offset);
18186 /* Return the length of an LEB128 number in BUF. */
18189 leb128_size (const gdb_byte *buf)
18191 const gdb_byte *begin = buf;
18197 if ((byte & 128) == 0)
18198 return buf - begin;
18203 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
18212 cu->language = language_c;
18215 case DW_LANG_C_plus_plus:
18216 case DW_LANG_C_plus_plus_11:
18217 case DW_LANG_C_plus_plus_14:
18218 cu->language = language_cplus;
18221 cu->language = language_d;
18223 case DW_LANG_Fortran77:
18224 case DW_LANG_Fortran90:
18225 case DW_LANG_Fortran95:
18226 case DW_LANG_Fortran03:
18227 case DW_LANG_Fortran08:
18228 cu->language = language_fortran;
18231 cu->language = language_go;
18233 case DW_LANG_Mips_Assembler:
18234 cu->language = language_asm;
18236 case DW_LANG_Ada83:
18237 case DW_LANG_Ada95:
18238 cu->language = language_ada;
18240 case DW_LANG_Modula2:
18241 cu->language = language_m2;
18243 case DW_LANG_Pascal83:
18244 cu->language = language_pascal;
18247 cu->language = language_objc;
18250 case DW_LANG_Rust_old:
18251 cu->language = language_rust;
18253 case DW_LANG_Cobol74:
18254 case DW_LANG_Cobol85:
18256 cu->language = language_minimal;
18259 cu->language_defn = language_def (cu->language);
18262 /* Return the named attribute or NULL if not there. */
18264 static struct attribute *
18265 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
18270 struct attribute *spec = NULL;
18272 for (i = 0; i < die->num_attrs; ++i)
18274 if (die->attrs[i].name == name)
18275 return &die->attrs[i];
18276 if (die->attrs[i].name == DW_AT_specification
18277 || die->attrs[i].name == DW_AT_abstract_origin)
18278 spec = &die->attrs[i];
18284 die = follow_die_ref (die, spec, &cu);
18290 /* Return the named attribute or NULL if not there,
18291 but do not follow DW_AT_specification, etc.
18292 This is for use in contexts where we're reading .debug_types dies.
18293 Following DW_AT_specification, DW_AT_abstract_origin will take us
18294 back up the chain, and we want to go down. */
18296 static struct attribute *
18297 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
18301 for (i = 0; i < die->num_attrs; ++i)
18302 if (die->attrs[i].name == name)
18303 return &die->attrs[i];
18308 /* Return the string associated with a string-typed attribute, or NULL if it
18309 is either not found or is of an incorrect type. */
18311 static const char *
18312 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
18314 struct attribute *attr;
18315 const char *str = NULL;
18317 attr = dwarf2_attr (die, name, cu);
18321 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
18322 || attr->form == DW_FORM_string
18323 || attr->form == DW_FORM_GNU_str_index
18324 || attr->form == DW_FORM_GNU_strp_alt)
18325 str = DW_STRING (attr);
18327 complaint (&symfile_complaints,
18328 _("string type expected for attribute %s for "
18329 "DIE at 0x%x in module %s"),
18330 dwarf_attr_name (name), to_underlying (die->sect_off),
18331 objfile_name (cu->objfile));
18337 /* Return non-zero iff the attribute NAME is defined for the given DIE,
18338 and holds a non-zero value. This function should only be used for
18339 DW_FORM_flag or DW_FORM_flag_present attributes. */
18342 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
18344 struct attribute *attr = dwarf2_attr (die, name, cu);
18346 return (attr && DW_UNSND (attr));
18350 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
18352 /* A DIE is a declaration if it has a DW_AT_declaration attribute
18353 which value is non-zero. However, we have to be careful with
18354 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
18355 (via dwarf2_flag_true_p) follows this attribute. So we may
18356 end up accidently finding a declaration attribute that belongs
18357 to a different DIE referenced by the specification attribute,
18358 even though the given DIE does not have a declaration attribute. */
18359 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
18360 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
18363 /* Return the die giving the specification for DIE, if there is
18364 one. *SPEC_CU is the CU containing DIE on input, and the CU
18365 containing the return value on output. If there is no
18366 specification, but there is an abstract origin, that is
18369 static struct die_info *
18370 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
18372 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
18375 if (spec_attr == NULL)
18376 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
18378 if (spec_attr == NULL)
18381 return follow_die_ref (die, spec_attr, spec_cu);
18384 /* Stub for free_line_header to match void * callback types. */
18387 free_line_header_voidp (void *arg)
18389 struct line_header *lh = (struct line_header *) arg;
18395 line_header::add_include_dir (const char *include_dir)
18397 if (dwarf_line_debug >= 2)
18398 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
18399 include_dirs.size () + 1, include_dir);
18401 include_dirs.push_back (include_dir);
18405 line_header::add_file_name (const char *name,
18407 unsigned int mod_time,
18408 unsigned int length)
18410 if (dwarf_line_debug >= 2)
18411 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
18412 (unsigned) file_names.size () + 1, name);
18414 file_names.emplace_back (name, d_index, mod_time, length);
18417 /* A convenience function to find the proper .debug_line section for a CU. */
18419 static struct dwarf2_section_info *
18420 get_debug_line_section (struct dwarf2_cu *cu)
18422 struct dwarf2_section_info *section;
18424 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
18426 if (cu->dwo_unit && cu->per_cu->is_debug_types)
18427 section = &cu->dwo_unit->dwo_file->sections.line;
18428 else if (cu->per_cu->is_dwz)
18430 struct dwz_file *dwz = dwarf2_get_dwz_file ();
18432 section = &dwz->line;
18435 section = &dwarf2_per_objfile->line;
18440 /* Read directory or file name entry format, starting with byte of
18441 format count entries, ULEB128 pairs of entry formats, ULEB128 of
18442 entries count and the entries themselves in the described entry
18446 read_formatted_entries (bfd *abfd, const gdb_byte **bufp,
18447 struct line_header *lh,
18448 const struct comp_unit_head *cu_header,
18449 void (*callback) (struct line_header *lh,
18452 unsigned int mod_time,
18453 unsigned int length))
18455 gdb_byte format_count, formati;
18456 ULONGEST data_count, datai;
18457 const gdb_byte *buf = *bufp;
18458 const gdb_byte *format_header_data;
18460 unsigned int bytes_read;
18462 format_count = read_1_byte (abfd, buf);
18464 format_header_data = buf;
18465 for (formati = 0; formati < format_count; formati++)
18467 read_unsigned_leb128 (abfd, buf, &bytes_read);
18469 read_unsigned_leb128 (abfd, buf, &bytes_read);
18473 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
18475 for (datai = 0; datai < data_count; datai++)
18477 const gdb_byte *format = format_header_data;
18478 struct file_entry fe;
18480 for (formati = 0; formati < format_count; formati++)
18482 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
18483 format += bytes_read;
18485 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
18486 format += bytes_read;
18488 gdb::optional<const char *> string;
18489 gdb::optional<unsigned int> uint;
18493 case DW_FORM_string:
18494 string.emplace (read_direct_string (abfd, buf, &bytes_read));
18498 case DW_FORM_line_strp:
18499 string.emplace (read_indirect_line_string (abfd, buf,
18505 case DW_FORM_data1:
18506 uint.emplace (read_1_byte (abfd, buf));
18510 case DW_FORM_data2:
18511 uint.emplace (read_2_bytes (abfd, buf));
18515 case DW_FORM_data4:
18516 uint.emplace (read_4_bytes (abfd, buf));
18520 case DW_FORM_data8:
18521 uint.emplace (read_8_bytes (abfd, buf));
18525 case DW_FORM_udata:
18526 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
18530 case DW_FORM_block:
18531 /* It is valid only for DW_LNCT_timestamp which is ignored by
18536 switch (content_type)
18539 if (string.has_value ())
18542 case DW_LNCT_directory_index:
18543 if (uint.has_value ())
18544 fe.d_index = (dir_index) *uint;
18546 case DW_LNCT_timestamp:
18547 if (uint.has_value ())
18548 fe.mod_time = *uint;
18551 if (uint.has_value ())
18557 complaint (&symfile_complaints,
18558 _("Unknown format content type %s"),
18559 pulongest (content_type));
18563 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
18569 /* Read the statement program header starting at OFFSET in
18570 .debug_line, or .debug_line.dwo. Return a pointer
18571 to a struct line_header, allocated using xmalloc.
18572 Returns NULL if there is a problem reading the header, e.g., if it
18573 has a version we don't understand.
18575 NOTE: the strings in the include directory and file name tables of
18576 the returned object point into the dwarf line section buffer,
18577 and must not be freed. */
18579 static line_header_up
18580 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
18582 const gdb_byte *line_ptr;
18583 unsigned int bytes_read, offset_size;
18585 const char *cur_dir, *cur_file;
18586 struct dwarf2_section_info *section;
18589 section = get_debug_line_section (cu);
18590 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
18591 if (section->buffer == NULL)
18593 if (cu->dwo_unit && cu->per_cu->is_debug_types)
18594 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
18596 complaint (&symfile_complaints, _("missing .debug_line section"));
18600 /* We can't do this until we know the section is non-empty.
18601 Only then do we know we have such a section. */
18602 abfd = get_section_bfd_owner (section);
18604 /* Make sure that at least there's room for the total_length field.
18605 That could be 12 bytes long, but we're just going to fudge that. */
18606 if (to_underlying (sect_off) + 4 >= section->size)
18608 dwarf2_statement_list_fits_in_line_number_section_complaint ();
18612 line_header_up lh (new line_header ());
18614 lh->sect_off = sect_off;
18615 lh->offset_in_dwz = cu->per_cu->is_dwz;
18617 line_ptr = section->buffer + to_underlying (sect_off);
18619 /* Read in the header. */
18621 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
18622 &bytes_read, &offset_size);
18623 line_ptr += bytes_read;
18624 if (line_ptr + lh->total_length > (section->buffer + section->size))
18626 dwarf2_statement_list_fits_in_line_number_section_complaint ();
18629 lh->statement_program_end = line_ptr + lh->total_length;
18630 lh->version = read_2_bytes (abfd, line_ptr);
18632 if (lh->version > 5)
18634 /* This is a version we don't understand. The format could have
18635 changed in ways we don't handle properly so just punt. */
18636 complaint (&symfile_complaints,
18637 _("unsupported version in .debug_line section"));
18640 if (lh->version >= 5)
18642 gdb_byte segment_selector_size;
18644 /* Skip address size. */
18645 read_1_byte (abfd, line_ptr);
18648 segment_selector_size = read_1_byte (abfd, line_ptr);
18650 if (segment_selector_size != 0)
18652 complaint (&symfile_complaints,
18653 _("unsupported segment selector size %u "
18654 "in .debug_line section"),
18655 segment_selector_size);
18659 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
18660 line_ptr += offset_size;
18661 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
18663 if (lh->version >= 4)
18665 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
18669 lh->maximum_ops_per_instruction = 1;
18671 if (lh->maximum_ops_per_instruction == 0)
18673 lh->maximum_ops_per_instruction = 1;
18674 complaint (&symfile_complaints,
18675 _("invalid maximum_ops_per_instruction "
18676 "in `.debug_line' section"));
18679 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
18681 lh->line_base = read_1_signed_byte (abfd, line_ptr);
18683 lh->line_range = read_1_byte (abfd, line_ptr);
18685 lh->opcode_base = read_1_byte (abfd, line_ptr);
18687 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
18689 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
18690 for (i = 1; i < lh->opcode_base; ++i)
18692 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
18696 if (lh->version >= 5)
18698 /* Read directory table. */
18699 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18700 [] (struct line_header *lh, const char *name,
18701 dir_index d_index, unsigned int mod_time,
18702 unsigned int length)
18704 lh->add_include_dir (name);
18707 /* Read file name table. */
18708 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18709 [] (struct line_header *lh, const char *name,
18710 dir_index d_index, unsigned int mod_time,
18711 unsigned int length)
18713 lh->add_file_name (name, d_index, mod_time, length);
18718 /* Read directory table. */
18719 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
18721 line_ptr += bytes_read;
18722 lh->add_include_dir (cur_dir);
18724 line_ptr += bytes_read;
18726 /* Read file name table. */
18727 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
18729 unsigned int mod_time, length;
18732 line_ptr += bytes_read;
18733 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18734 line_ptr += bytes_read;
18735 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18736 line_ptr += bytes_read;
18737 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
18738 line_ptr += bytes_read;
18740 lh->add_file_name (cur_file, d_index, mod_time, length);
18742 line_ptr += bytes_read;
18744 lh->statement_program_start = line_ptr;
18746 if (line_ptr > (section->buffer + section->size))
18747 complaint (&symfile_complaints,
18748 _("line number info header doesn't "
18749 "fit in `.debug_line' section"));
18754 /* Subroutine of dwarf_decode_lines to simplify it.
18755 Return the file name of the psymtab for included file FILE_INDEX
18756 in line header LH of PST.
18757 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
18758 If space for the result is malloc'd, it will be freed by a cleanup.
18759 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
18761 The function creates dangling cleanup registration. */
18763 static const char *
18764 psymtab_include_file_name (const struct line_header *lh, int file_index,
18765 const struct partial_symtab *pst,
18766 const char *comp_dir)
18768 const file_entry &fe = lh->file_names[file_index];
18769 const char *include_name = fe.name;
18770 const char *include_name_to_compare = include_name;
18771 const char *pst_filename;
18772 char *copied_name = NULL;
18775 const char *dir_name = fe.include_dir (lh);
18777 if (!IS_ABSOLUTE_PATH (include_name)
18778 && (dir_name != NULL || comp_dir != NULL))
18780 /* Avoid creating a duplicate psymtab for PST.
18781 We do this by comparing INCLUDE_NAME and PST_FILENAME.
18782 Before we do the comparison, however, we need to account
18783 for DIR_NAME and COMP_DIR.
18784 First prepend dir_name (if non-NULL). If we still don't
18785 have an absolute path prepend comp_dir (if non-NULL).
18786 However, the directory we record in the include-file's
18787 psymtab does not contain COMP_DIR (to match the
18788 corresponding symtab(s)).
18793 bash$ gcc -g ./hello.c
18794 include_name = "hello.c"
18796 DW_AT_comp_dir = comp_dir = "/tmp"
18797 DW_AT_name = "./hello.c"
18801 if (dir_name != NULL)
18803 char *tem = concat (dir_name, SLASH_STRING,
18804 include_name, (char *)NULL);
18806 make_cleanup (xfree, tem);
18807 include_name = tem;
18808 include_name_to_compare = include_name;
18810 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
18812 char *tem = concat (comp_dir, SLASH_STRING,
18813 include_name, (char *)NULL);
18815 make_cleanup (xfree, tem);
18816 include_name_to_compare = tem;
18820 pst_filename = pst->filename;
18821 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
18823 copied_name = concat (pst->dirname, SLASH_STRING,
18824 pst_filename, (char *)NULL);
18825 pst_filename = copied_name;
18828 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
18830 if (copied_name != NULL)
18831 xfree (copied_name);
18835 return include_name;
18838 /* State machine to track the state of the line number program. */
18840 class lnp_state_machine
18843 /* Initialize a machine state for the start of a line number
18845 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
18847 file_entry *current_file ()
18849 /* lh->file_names is 0-based, but the file name numbers in the
18850 statement program are 1-based. */
18851 return m_line_header->file_name_at (m_file);
18854 /* Record the line in the state machine. END_SEQUENCE is true if
18855 we're processing the end of a sequence. */
18856 void record_line (bool end_sequence);
18858 /* Check address and if invalid nop-out the rest of the lines in this
18860 void check_line_address (struct dwarf2_cu *cu,
18861 const gdb_byte *line_ptr,
18862 CORE_ADDR lowpc, CORE_ADDR address);
18864 void handle_set_discriminator (unsigned int discriminator)
18866 m_discriminator = discriminator;
18867 m_line_has_non_zero_discriminator |= discriminator != 0;
18870 /* Handle DW_LNE_set_address. */
18871 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
18874 address += baseaddr;
18875 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
18878 /* Handle DW_LNS_advance_pc. */
18879 void handle_advance_pc (CORE_ADDR adjust);
18881 /* Handle a special opcode. */
18882 void handle_special_opcode (unsigned char op_code);
18884 /* Handle DW_LNS_advance_line. */
18885 void handle_advance_line (int line_delta)
18887 advance_line (line_delta);
18890 /* Handle DW_LNS_set_file. */
18891 void handle_set_file (file_name_index file);
18893 /* Handle DW_LNS_negate_stmt. */
18894 void handle_negate_stmt ()
18896 m_is_stmt = !m_is_stmt;
18899 /* Handle DW_LNS_const_add_pc. */
18900 void handle_const_add_pc ();
18902 /* Handle DW_LNS_fixed_advance_pc. */
18903 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
18905 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18909 /* Handle DW_LNS_copy. */
18910 void handle_copy ()
18912 record_line (false);
18913 m_discriminator = 0;
18916 /* Handle DW_LNE_end_sequence. */
18917 void handle_end_sequence ()
18919 m_record_line_callback = ::record_line;
18923 /* Advance the line by LINE_DELTA. */
18924 void advance_line (int line_delta)
18926 m_line += line_delta;
18928 if (line_delta != 0)
18929 m_line_has_non_zero_discriminator = m_discriminator != 0;
18932 gdbarch *m_gdbarch;
18934 /* True if we're recording lines.
18935 Otherwise we're building partial symtabs and are just interested in
18936 finding include files mentioned by the line number program. */
18937 bool m_record_lines_p;
18939 /* The line number header. */
18940 line_header *m_line_header;
18942 /* These are part of the standard DWARF line number state machine,
18943 and initialized according to the DWARF spec. */
18945 unsigned char m_op_index = 0;
18946 /* The line table index (1-based) of the current file. */
18947 file_name_index m_file = (file_name_index) 1;
18948 unsigned int m_line = 1;
18950 /* These are initialized in the constructor. */
18952 CORE_ADDR m_address;
18954 unsigned int m_discriminator;
18956 /* Additional bits of state we need to track. */
18958 /* The last file that we called dwarf2_start_subfile for.
18959 This is only used for TLLs. */
18960 unsigned int m_last_file = 0;
18961 /* The last file a line number was recorded for. */
18962 struct subfile *m_last_subfile = NULL;
18964 /* The function to call to record a line. */
18965 record_line_ftype *m_record_line_callback = NULL;
18967 /* The last line number that was recorded, used to coalesce
18968 consecutive entries for the same line. This can happen, for
18969 example, when discriminators are present. PR 17276. */
18970 unsigned int m_last_line = 0;
18971 bool m_line_has_non_zero_discriminator = false;
18975 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
18977 CORE_ADDR addr_adj = (((m_op_index + adjust)
18978 / m_line_header->maximum_ops_per_instruction)
18979 * m_line_header->minimum_instruction_length);
18980 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18981 m_op_index = ((m_op_index + adjust)
18982 % m_line_header->maximum_ops_per_instruction);
18986 lnp_state_machine::handle_special_opcode (unsigned char op_code)
18988 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
18989 CORE_ADDR addr_adj = (((m_op_index
18990 + (adj_opcode / m_line_header->line_range))
18991 / m_line_header->maximum_ops_per_instruction)
18992 * m_line_header->minimum_instruction_length);
18993 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
18994 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
18995 % m_line_header->maximum_ops_per_instruction);
18997 int line_delta = (m_line_header->line_base
18998 + (adj_opcode % m_line_header->line_range));
18999 advance_line (line_delta);
19000 record_line (false);
19001 m_discriminator = 0;
19005 lnp_state_machine::handle_set_file (file_name_index file)
19009 const file_entry *fe = current_file ();
19011 dwarf2_debug_line_missing_file_complaint ();
19012 else if (m_record_lines_p)
19014 const char *dir = fe->include_dir (m_line_header);
19016 m_last_subfile = current_subfile;
19017 m_line_has_non_zero_discriminator = m_discriminator != 0;
19018 dwarf2_start_subfile (fe->name, dir);
19023 lnp_state_machine::handle_const_add_pc ()
19026 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
19029 = (((m_op_index + adjust)
19030 / m_line_header->maximum_ops_per_instruction)
19031 * m_line_header->minimum_instruction_length);
19033 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
19034 m_op_index = ((m_op_index + adjust)
19035 % m_line_header->maximum_ops_per_instruction);
19038 /* Ignore this record_line request. */
19041 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
19046 /* Return non-zero if we should add LINE to the line number table.
19047 LINE is the line to add, LAST_LINE is the last line that was added,
19048 LAST_SUBFILE is the subfile for LAST_LINE.
19049 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
19050 had a non-zero discriminator.
19052 We have to be careful in the presence of discriminators.
19053 E.g., for this line:
19055 for (i = 0; i < 100000; i++);
19057 clang can emit four line number entries for that one line,
19058 each with a different discriminator.
19059 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
19061 However, we want gdb to coalesce all four entries into one.
19062 Otherwise the user could stepi into the middle of the line and
19063 gdb would get confused about whether the pc really was in the
19064 middle of the line.
19066 Things are further complicated by the fact that two consecutive
19067 line number entries for the same line is a heuristic used by gcc
19068 to denote the end of the prologue. So we can't just discard duplicate
19069 entries, we have to be selective about it. The heuristic we use is
19070 that we only collapse consecutive entries for the same line if at least
19071 one of those entries has a non-zero discriminator. PR 17276.
19073 Note: Addresses in the line number state machine can never go backwards
19074 within one sequence, thus this coalescing is ok. */
19077 dwarf_record_line_p (unsigned int line, unsigned int last_line,
19078 int line_has_non_zero_discriminator,
19079 struct subfile *last_subfile)
19081 if (current_subfile != last_subfile)
19083 if (line != last_line)
19085 /* Same line for the same file that we've seen already.
19086 As a last check, for pr 17276, only record the line if the line
19087 has never had a non-zero discriminator. */
19088 if (!line_has_non_zero_discriminator)
19093 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
19094 in the line table of subfile SUBFILE. */
19097 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
19098 unsigned int line, CORE_ADDR address,
19099 record_line_ftype p_record_line)
19101 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
19103 if (dwarf_line_debug)
19105 fprintf_unfiltered (gdb_stdlog,
19106 "Recording line %u, file %s, address %s\n",
19107 line, lbasename (subfile->name),
19108 paddress (gdbarch, address));
19111 (*p_record_line) (subfile, line, addr);
19114 /* Subroutine of dwarf_decode_lines_1 to simplify it.
19115 Mark the end of a set of line number records.
19116 The arguments are the same as for dwarf_record_line_1.
19117 If SUBFILE is NULL the request is ignored. */
19120 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
19121 CORE_ADDR address, record_line_ftype p_record_line)
19123 if (subfile == NULL)
19126 if (dwarf_line_debug)
19128 fprintf_unfiltered (gdb_stdlog,
19129 "Finishing current line, file %s, address %s\n",
19130 lbasename (subfile->name),
19131 paddress (gdbarch, address));
19134 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
19138 lnp_state_machine::record_line (bool end_sequence)
19140 if (dwarf_line_debug)
19142 fprintf_unfiltered (gdb_stdlog,
19143 "Processing actual line %u: file %u,"
19144 " address %s, is_stmt %u, discrim %u\n",
19145 m_line, to_underlying (m_file),
19146 paddress (m_gdbarch, m_address),
19147 m_is_stmt, m_discriminator);
19150 file_entry *fe = current_file ();
19153 dwarf2_debug_line_missing_file_complaint ();
19154 /* For now we ignore lines not starting on an instruction boundary.
19155 But not when processing end_sequence for compatibility with the
19156 previous version of the code. */
19157 else if (m_op_index == 0 || end_sequence)
19159 fe->included_p = 1;
19160 if (m_record_lines_p && m_is_stmt)
19162 if (m_last_subfile != current_subfile || end_sequence)
19164 dwarf_finish_line (m_gdbarch, m_last_subfile,
19165 m_address, m_record_line_callback);
19170 if (dwarf_record_line_p (m_line, m_last_line,
19171 m_line_has_non_zero_discriminator,
19174 dwarf_record_line_1 (m_gdbarch, current_subfile,
19176 m_record_line_callback);
19178 m_last_subfile = current_subfile;
19179 m_last_line = m_line;
19185 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
19186 bool record_lines_p)
19189 m_record_lines_p = record_lines_p;
19190 m_line_header = lh;
19192 m_record_line_callback = ::record_line;
19194 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
19195 was a line entry for it so that the backend has a chance to adjust it
19196 and also record it in case it needs it. This is currently used by MIPS
19197 code, cf. `mips_adjust_dwarf2_line'. */
19198 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
19199 m_is_stmt = lh->default_is_stmt;
19200 m_discriminator = 0;
19204 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
19205 const gdb_byte *line_ptr,
19206 CORE_ADDR lowpc, CORE_ADDR address)
19208 /* If address < lowpc then it's not a usable value, it's outside the
19209 pc range of the CU. However, we restrict the test to only address
19210 values of zero to preserve GDB's previous behaviour which is to
19211 handle the specific case of a function being GC'd by the linker. */
19213 if (address == 0 && address < lowpc)
19215 /* This line table is for a function which has been
19216 GCd by the linker. Ignore it. PR gdb/12528 */
19218 struct objfile *objfile = cu->objfile;
19219 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
19221 complaint (&symfile_complaints,
19222 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
19223 line_offset, objfile_name (objfile));
19224 m_record_line_callback = noop_record_line;
19225 /* Note: record_line_callback is left as noop_record_line until
19226 we see DW_LNE_end_sequence. */
19230 /* Subroutine of dwarf_decode_lines to simplify it.
19231 Process the line number information in LH.
19232 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
19233 program in order to set included_p for every referenced header. */
19236 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
19237 const int decode_for_pst_p, CORE_ADDR lowpc)
19239 const gdb_byte *line_ptr, *extended_end;
19240 const gdb_byte *line_end;
19241 unsigned int bytes_read, extended_len;
19242 unsigned char op_code, extended_op;
19243 CORE_ADDR baseaddr;
19244 struct objfile *objfile = cu->objfile;
19245 bfd *abfd = objfile->obfd;
19246 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19247 /* True if we're recording line info (as opposed to building partial
19248 symtabs and just interested in finding include files mentioned by
19249 the line number program). */
19250 bool record_lines_p = !decode_for_pst_p;
19252 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
19254 line_ptr = lh->statement_program_start;
19255 line_end = lh->statement_program_end;
19257 /* Read the statement sequences until there's nothing left. */
19258 while (line_ptr < line_end)
19260 /* The DWARF line number program state machine. Reset the state
19261 machine at the start of each sequence. */
19262 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
19263 bool end_sequence = false;
19265 if (record_lines_p)
19267 /* Start a subfile for the current file of the state
19269 const file_entry *fe = state_machine.current_file ();
19272 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
19275 /* Decode the table. */
19276 while (line_ptr < line_end && !end_sequence)
19278 op_code = read_1_byte (abfd, line_ptr);
19281 if (op_code >= lh->opcode_base)
19283 /* Special opcode. */
19284 state_machine.handle_special_opcode (op_code);
19286 else switch (op_code)
19288 case DW_LNS_extended_op:
19289 extended_len = read_unsigned_leb128 (abfd, line_ptr,
19291 line_ptr += bytes_read;
19292 extended_end = line_ptr + extended_len;
19293 extended_op = read_1_byte (abfd, line_ptr);
19295 switch (extended_op)
19297 case DW_LNE_end_sequence:
19298 state_machine.handle_end_sequence ();
19299 end_sequence = true;
19301 case DW_LNE_set_address:
19304 = read_address (abfd, line_ptr, cu, &bytes_read);
19305 line_ptr += bytes_read;
19307 state_machine.check_line_address (cu, line_ptr,
19309 state_machine.handle_set_address (baseaddr, address);
19312 case DW_LNE_define_file:
19314 const char *cur_file;
19315 unsigned int mod_time, length;
19318 cur_file = read_direct_string (abfd, line_ptr,
19320 line_ptr += bytes_read;
19321 dindex = (dir_index)
19322 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19323 line_ptr += bytes_read;
19325 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19326 line_ptr += bytes_read;
19328 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19329 line_ptr += bytes_read;
19330 lh->add_file_name (cur_file, dindex, mod_time, length);
19333 case DW_LNE_set_discriminator:
19335 /* The discriminator is not interesting to the
19336 debugger; just ignore it. We still need to
19337 check its value though:
19338 if there are consecutive entries for the same
19339 (non-prologue) line we want to coalesce them.
19342 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19343 line_ptr += bytes_read;
19345 state_machine.handle_set_discriminator (discr);
19349 complaint (&symfile_complaints,
19350 _("mangled .debug_line section"));
19353 /* Make sure that we parsed the extended op correctly. If e.g.
19354 we expected a different address size than the producer used,
19355 we may have read the wrong number of bytes. */
19356 if (line_ptr != extended_end)
19358 complaint (&symfile_complaints,
19359 _("mangled .debug_line section"));
19364 state_machine.handle_copy ();
19366 case DW_LNS_advance_pc:
19369 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19370 line_ptr += bytes_read;
19372 state_machine.handle_advance_pc (adjust);
19375 case DW_LNS_advance_line:
19378 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
19379 line_ptr += bytes_read;
19381 state_machine.handle_advance_line (line_delta);
19384 case DW_LNS_set_file:
19386 file_name_index file
19387 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
19389 line_ptr += bytes_read;
19391 state_machine.handle_set_file (file);
19394 case DW_LNS_set_column:
19395 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19396 line_ptr += bytes_read;
19398 case DW_LNS_negate_stmt:
19399 state_machine.handle_negate_stmt ();
19401 case DW_LNS_set_basic_block:
19403 /* Add to the address register of the state machine the
19404 address increment value corresponding to special opcode
19405 255. I.e., this value is scaled by the minimum
19406 instruction length since special opcode 255 would have
19407 scaled the increment. */
19408 case DW_LNS_const_add_pc:
19409 state_machine.handle_const_add_pc ();
19411 case DW_LNS_fixed_advance_pc:
19413 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
19416 state_machine.handle_fixed_advance_pc (addr_adj);
19421 /* Unknown standard opcode, ignore it. */
19424 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
19426 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19427 line_ptr += bytes_read;
19434 dwarf2_debug_line_missing_end_sequence_complaint ();
19436 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
19437 in which case we still finish recording the last line). */
19438 state_machine.record_line (true);
19442 /* Decode the Line Number Program (LNP) for the given line_header
19443 structure and CU. The actual information extracted and the type
19444 of structures created from the LNP depends on the value of PST.
19446 1. If PST is NULL, then this procedure uses the data from the program
19447 to create all necessary symbol tables, and their linetables.
19449 2. If PST is not NULL, this procedure reads the program to determine
19450 the list of files included by the unit represented by PST, and
19451 builds all the associated partial symbol tables.
19453 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
19454 It is used for relative paths in the line table.
19455 NOTE: When processing partial symtabs (pst != NULL),
19456 comp_dir == pst->dirname.
19458 NOTE: It is important that psymtabs have the same file name (via strcmp)
19459 as the corresponding symtab. Since COMP_DIR is not used in the name of the
19460 symtab we don't use it in the name of the psymtabs we create.
19461 E.g. expand_line_sal requires this when finding psymtabs to expand.
19462 A good testcase for this is mb-inline.exp.
19464 LOWPC is the lowest address in CU (or 0 if not known).
19466 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
19467 for its PC<->lines mapping information. Otherwise only the filename
19468 table is read in. */
19471 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
19472 struct dwarf2_cu *cu, struct partial_symtab *pst,
19473 CORE_ADDR lowpc, int decode_mapping)
19475 struct objfile *objfile = cu->objfile;
19476 const int decode_for_pst_p = (pst != NULL);
19478 if (decode_mapping)
19479 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
19481 if (decode_for_pst_p)
19485 /* Now that we're done scanning the Line Header Program, we can
19486 create the psymtab of each included file. */
19487 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
19488 if (lh->file_names[file_index].included_p == 1)
19490 const char *include_name =
19491 psymtab_include_file_name (lh, file_index, pst, comp_dir);
19492 if (include_name != NULL)
19493 dwarf2_create_include_psymtab (include_name, pst, objfile);
19498 /* Make sure a symtab is created for every file, even files
19499 which contain only variables (i.e. no code with associated
19501 struct compunit_symtab *cust = buildsym_compunit_symtab ();
19504 for (i = 0; i < lh->file_names.size (); i++)
19506 file_entry &fe = lh->file_names[i];
19508 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
19510 if (current_subfile->symtab == NULL)
19512 current_subfile->symtab
19513 = allocate_symtab (cust, current_subfile->name);
19515 fe.symtab = current_subfile->symtab;
19520 /* Start a subfile for DWARF. FILENAME is the name of the file and
19521 DIRNAME the name of the source directory which contains FILENAME
19522 or NULL if not known.
19523 This routine tries to keep line numbers from identical absolute and
19524 relative file names in a common subfile.
19526 Using the `list' example from the GDB testsuite, which resides in
19527 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
19528 of /srcdir/list0.c yields the following debugging information for list0.c:
19530 DW_AT_name: /srcdir/list0.c
19531 DW_AT_comp_dir: /compdir
19532 files.files[0].name: list0.h
19533 files.files[0].dir: /srcdir
19534 files.files[1].name: list0.c
19535 files.files[1].dir: /srcdir
19537 The line number information for list0.c has to end up in a single
19538 subfile, so that `break /srcdir/list0.c:1' works as expected.
19539 start_subfile will ensure that this happens provided that we pass the
19540 concatenation of files.files[1].dir and files.files[1].name as the
19544 dwarf2_start_subfile (const char *filename, const char *dirname)
19548 /* In order not to lose the line information directory,
19549 we concatenate it to the filename when it makes sense.
19550 Note that the Dwarf3 standard says (speaking of filenames in line
19551 information): ``The directory index is ignored for file names
19552 that represent full path names''. Thus ignoring dirname in the
19553 `else' branch below isn't an issue. */
19555 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
19557 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
19561 start_subfile (filename);
19567 /* Start a symtab for DWARF.
19568 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
19570 static struct compunit_symtab *
19571 dwarf2_start_symtab (struct dwarf2_cu *cu,
19572 const char *name, const char *comp_dir, CORE_ADDR low_pc)
19574 struct compunit_symtab *cust
19575 = start_symtab (cu->objfile, name, comp_dir, low_pc, cu->language);
19577 record_debugformat ("DWARF 2");
19578 record_producer (cu->producer);
19580 /* We assume that we're processing GCC output. */
19581 processing_gcc_compilation = 2;
19583 cu->processing_has_namespace_info = 0;
19589 var_decode_location (struct attribute *attr, struct symbol *sym,
19590 struct dwarf2_cu *cu)
19592 struct objfile *objfile = cu->objfile;
19593 struct comp_unit_head *cu_header = &cu->header;
19595 /* NOTE drow/2003-01-30: There used to be a comment and some special
19596 code here to turn a symbol with DW_AT_external and a
19597 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
19598 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
19599 with some versions of binutils) where shared libraries could have
19600 relocations against symbols in their debug information - the
19601 minimal symbol would have the right address, but the debug info
19602 would not. It's no longer necessary, because we will explicitly
19603 apply relocations when we read in the debug information now. */
19605 /* A DW_AT_location attribute with no contents indicates that a
19606 variable has been optimized away. */
19607 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
19609 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
19613 /* Handle one degenerate form of location expression specially, to
19614 preserve GDB's previous behavior when section offsets are
19615 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
19616 then mark this symbol as LOC_STATIC. */
19618 if (attr_form_is_block (attr)
19619 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
19620 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
19621 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
19622 && (DW_BLOCK (attr)->size
19623 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
19625 unsigned int dummy;
19627 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
19628 SYMBOL_VALUE_ADDRESS (sym) =
19629 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
19631 SYMBOL_VALUE_ADDRESS (sym) =
19632 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
19633 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
19634 fixup_symbol_section (sym, objfile);
19635 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
19636 SYMBOL_SECTION (sym));
19640 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
19641 expression evaluator, and use LOC_COMPUTED only when necessary
19642 (i.e. when the value of a register or memory location is
19643 referenced, or a thread-local block, etc.). Then again, it might
19644 not be worthwhile. I'm assuming that it isn't unless performance
19645 or memory numbers show me otherwise. */
19647 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
19649 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
19650 cu->has_loclist = 1;
19653 /* Given a pointer to a DWARF information entry, figure out if we need
19654 to make a symbol table entry for it, and if so, create a new entry
19655 and return a pointer to it.
19656 If TYPE is NULL, determine symbol type from the die, otherwise
19657 used the passed type.
19658 If SPACE is not NULL, use it to hold the new symbol. If it is
19659 NULL, allocate a new symbol on the objfile's obstack. */
19661 static struct symbol *
19662 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
19663 struct symbol *space)
19665 struct objfile *objfile = cu->objfile;
19666 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19667 struct symbol *sym = NULL;
19669 struct attribute *attr = NULL;
19670 struct attribute *attr2 = NULL;
19671 CORE_ADDR baseaddr;
19672 struct pending **list_to_add = NULL;
19674 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
19676 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
19678 name = dwarf2_name (die, cu);
19681 const char *linkagename;
19682 int suppress_add = 0;
19687 sym = allocate_symbol (objfile);
19688 OBJSTAT (objfile, n_syms++);
19690 /* Cache this symbol's name and the name's demangled form (if any). */
19691 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
19692 linkagename = dwarf2_physname (name, die, cu);
19693 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
19695 /* Fortran does not have mangling standard and the mangling does differ
19696 between gfortran, iFort etc. */
19697 if (cu->language == language_fortran
19698 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
19699 symbol_set_demangled_name (&(sym->ginfo),
19700 dwarf2_full_name (name, die, cu),
19703 /* Default assumptions.
19704 Use the passed type or decode it from the die. */
19705 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19706 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
19708 SYMBOL_TYPE (sym) = type;
19710 SYMBOL_TYPE (sym) = die_type (die, cu);
19711 attr = dwarf2_attr (die,
19712 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
19716 SYMBOL_LINE (sym) = DW_UNSND (attr);
19719 attr = dwarf2_attr (die,
19720 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
19724 file_name_index file_index = (file_name_index) DW_UNSND (attr);
19725 struct file_entry *fe;
19727 if (cu->line_header != NULL)
19728 fe = cu->line_header->file_name_at (file_index);
19733 complaint (&symfile_complaints,
19734 _("file index out of range"));
19736 symbol_set_symtab (sym, fe->symtab);
19742 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
19747 addr = attr_value_as_address (attr);
19748 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
19749 SYMBOL_VALUE_ADDRESS (sym) = addr;
19751 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
19752 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
19753 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
19754 add_symbol_to_list (sym, cu->list_in_scope);
19756 case DW_TAG_subprogram:
19757 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
19759 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
19760 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19761 if ((attr2 && (DW_UNSND (attr2) != 0))
19762 || cu->language == language_ada)
19764 /* Subprograms marked external are stored as a global symbol.
19765 Ada subprograms, whether marked external or not, are always
19766 stored as a global symbol, because we want to be able to
19767 access them globally. For instance, we want to be able
19768 to break on a nested subprogram without having to
19769 specify the context. */
19770 list_to_add = &global_symbols;
19774 list_to_add = cu->list_in_scope;
19777 case DW_TAG_inlined_subroutine:
19778 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
19780 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
19781 SYMBOL_INLINED (sym) = 1;
19782 list_to_add = cu->list_in_scope;
19784 case DW_TAG_template_value_param:
19786 /* Fall through. */
19787 case DW_TAG_constant:
19788 case DW_TAG_variable:
19789 case DW_TAG_member:
19790 /* Compilation with minimal debug info may result in
19791 variables with missing type entries. Change the
19792 misleading `void' type to something sensible. */
19793 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
19794 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
19796 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19797 /* In the case of DW_TAG_member, we should only be called for
19798 static const members. */
19799 if (die->tag == DW_TAG_member)
19801 /* dwarf2_add_field uses die_is_declaration,
19802 so we do the same. */
19803 gdb_assert (die_is_declaration (die, cu));
19808 dwarf2_const_value (attr, sym, cu);
19809 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19812 if (attr2 && (DW_UNSND (attr2) != 0))
19813 list_to_add = &global_symbols;
19815 list_to_add = cu->list_in_scope;
19819 attr = dwarf2_attr (die, DW_AT_location, cu);
19822 var_decode_location (attr, sym, cu);
19823 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19825 /* Fortran explicitly imports any global symbols to the local
19826 scope by DW_TAG_common_block. */
19827 if (cu->language == language_fortran && die->parent
19828 && die->parent->tag == DW_TAG_common_block)
19831 if (SYMBOL_CLASS (sym) == LOC_STATIC
19832 && SYMBOL_VALUE_ADDRESS (sym) == 0
19833 && !dwarf2_per_objfile->has_section_at_zero)
19835 /* When a static variable is eliminated by the linker,
19836 the corresponding debug information is not stripped
19837 out, but the variable address is set to null;
19838 do not add such variables into symbol table. */
19840 else if (attr2 && (DW_UNSND (attr2) != 0))
19842 /* Workaround gfortran PR debug/40040 - it uses
19843 DW_AT_location for variables in -fPIC libraries which may
19844 get overriden by other libraries/executable and get
19845 a different address. Resolve it by the minimal symbol
19846 which may come from inferior's executable using copy
19847 relocation. Make this workaround only for gfortran as for
19848 other compilers GDB cannot guess the minimal symbol
19849 Fortran mangling kind. */
19850 if (cu->language == language_fortran && die->parent
19851 && die->parent->tag == DW_TAG_module
19853 && startswith (cu->producer, "GNU Fortran"))
19854 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19856 /* A variable with DW_AT_external is never static,
19857 but it may be block-scoped. */
19858 list_to_add = (cu->list_in_scope == &file_symbols
19859 ? &global_symbols : cu->list_in_scope);
19862 list_to_add = cu->list_in_scope;
19866 /* We do not know the address of this symbol.
19867 If it is an external symbol and we have type information
19868 for it, enter the symbol as a LOC_UNRESOLVED symbol.
19869 The address of the variable will then be determined from
19870 the minimal symbol table whenever the variable is
19872 attr2 = dwarf2_attr (die, DW_AT_external, cu);
19874 /* Fortran explicitly imports any global symbols to the local
19875 scope by DW_TAG_common_block. */
19876 if (cu->language == language_fortran && die->parent
19877 && die->parent->tag == DW_TAG_common_block)
19879 /* SYMBOL_CLASS doesn't matter here because
19880 read_common_block is going to reset it. */
19882 list_to_add = cu->list_in_scope;
19884 else if (attr2 && (DW_UNSND (attr2) != 0)
19885 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
19887 /* A variable with DW_AT_external is never static, but it
19888 may be block-scoped. */
19889 list_to_add = (cu->list_in_scope == &file_symbols
19890 ? &global_symbols : cu->list_in_scope);
19892 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
19894 else if (!die_is_declaration (die, cu))
19896 /* Use the default LOC_OPTIMIZED_OUT class. */
19897 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
19899 list_to_add = cu->list_in_scope;
19903 case DW_TAG_formal_parameter:
19904 /* If we are inside a function, mark this as an argument. If
19905 not, we might be looking at an argument to an inlined function
19906 when we do not have enough information to show inlined frames;
19907 pretend it's a local variable in that case so that the user can
19909 if (context_stack_depth > 0
19910 && context_stack[context_stack_depth - 1].name != NULL)
19911 SYMBOL_IS_ARGUMENT (sym) = 1;
19912 attr = dwarf2_attr (die, DW_AT_location, cu);
19915 var_decode_location (attr, sym, cu);
19917 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19920 dwarf2_const_value (attr, sym, cu);
19923 list_to_add = cu->list_in_scope;
19925 case DW_TAG_unspecified_parameters:
19926 /* From varargs functions; gdb doesn't seem to have any
19927 interest in this information, so just ignore it for now.
19930 case DW_TAG_template_type_param:
19932 /* Fall through. */
19933 case DW_TAG_class_type:
19934 case DW_TAG_interface_type:
19935 case DW_TAG_structure_type:
19936 case DW_TAG_union_type:
19937 case DW_TAG_set_type:
19938 case DW_TAG_enumeration_type:
19939 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19940 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
19943 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
19944 really ever be static objects: otherwise, if you try
19945 to, say, break of a class's method and you're in a file
19946 which doesn't mention that class, it won't work unless
19947 the check for all static symbols in lookup_symbol_aux
19948 saves you. See the OtherFileClass tests in
19949 gdb.c++/namespace.exp. */
19953 list_to_add = (cu->list_in_scope == &file_symbols
19954 && cu->language == language_cplus
19955 ? &global_symbols : cu->list_in_scope);
19957 /* The semantics of C++ state that "struct foo {
19958 ... }" also defines a typedef for "foo". */
19959 if (cu->language == language_cplus
19960 || cu->language == language_ada
19961 || cu->language == language_d
19962 || cu->language == language_rust)
19964 /* The symbol's name is already allocated along
19965 with this objfile, so we don't need to
19966 duplicate it for the type. */
19967 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
19968 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
19973 case DW_TAG_typedef:
19974 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19975 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19976 list_to_add = cu->list_in_scope;
19978 case DW_TAG_base_type:
19979 case DW_TAG_subrange_type:
19980 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
19981 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19982 list_to_add = cu->list_in_scope;
19984 case DW_TAG_enumerator:
19985 attr = dwarf2_attr (die, DW_AT_const_value, cu);
19988 dwarf2_const_value (attr, sym, cu);
19991 /* NOTE: carlton/2003-11-10: See comment above in the
19992 DW_TAG_class_type, etc. block. */
19994 list_to_add = (cu->list_in_scope == &file_symbols
19995 && cu->language == language_cplus
19996 ? &global_symbols : cu->list_in_scope);
19999 case DW_TAG_imported_declaration:
20000 case DW_TAG_namespace:
20001 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
20002 list_to_add = &global_symbols;
20004 case DW_TAG_module:
20005 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
20006 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
20007 list_to_add = &global_symbols;
20009 case DW_TAG_common_block:
20010 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
20011 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
20012 add_symbol_to_list (sym, cu->list_in_scope);
20015 /* Not a tag we recognize. Hopefully we aren't processing
20016 trash data, but since we must specifically ignore things
20017 we don't recognize, there is nothing else we should do at
20019 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
20020 dwarf_tag_name (die->tag));
20026 sym->hash_next = objfile->template_symbols;
20027 objfile->template_symbols = sym;
20028 list_to_add = NULL;
20031 if (list_to_add != NULL)
20032 add_symbol_to_list (sym, list_to_add);
20034 /* For the benefit of old versions of GCC, check for anonymous
20035 namespaces based on the demangled name. */
20036 if (!cu->processing_has_namespace_info
20037 && cu->language == language_cplus)
20038 cp_scan_for_anonymous_namespaces (sym, objfile);
20043 /* A wrapper for new_symbol_full that always allocates a new symbol. */
20045 static struct symbol *
20046 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
20048 return new_symbol_full (die, type, cu, NULL);
20051 /* Given an attr with a DW_FORM_dataN value in host byte order,
20052 zero-extend it as appropriate for the symbol's type. The DWARF
20053 standard (v4) is not entirely clear about the meaning of using
20054 DW_FORM_dataN for a constant with a signed type, where the type is
20055 wider than the data. The conclusion of a discussion on the DWARF
20056 list was that this is unspecified. We choose to always zero-extend
20057 because that is the interpretation long in use by GCC. */
20060 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
20061 struct dwarf2_cu *cu, LONGEST *value, int bits)
20063 struct objfile *objfile = cu->objfile;
20064 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
20065 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
20066 LONGEST l = DW_UNSND (attr);
20068 if (bits < sizeof (*value) * 8)
20070 l &= ((LONGEST) 1 << bits) - 1;
20073 else if (bits == sizeof (*value) * 8)
20077 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
20078 store_unsigned_integer (bytes, bits / 8, byte_order, l);
20085 /* Read a constant value from an attribute. Either set *VALUE, or if
20086 the value does not fit in *VALUE, set *BYTES - either already
20087 allocated on the objfile obstack, or newly allocated on OBSTACK,
20088 or, set *BATON, if we translated the constant to a location
20092 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
20093 const char *name, struct obstack *obstack,
20094 struct dwarf2_cu *cu,
20095 LONGEST *value, const gdb_byte **bytes,
20096 struct dwarf2_locexpr_baton **baton)
20098 struct objfile *objfile = cu->objfile;
20099 struct comp_unit_head *cu_header = &cu->header;
20100 struct dwarf_block *blk;
20101 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
20102 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
20108 switch (attr->form)
20111 case DW_FORM_GNU_addr_index:
20115 if (TYPE_LENGTH (type) != cu_header->addr_size)
20116 dwarf2_const_value_length_mismatch_complaint (name,
20117 cu_header->addr_size,
20118 TYPE_LENGTH (type));
20119 /* Symbols of this form are reasonably rare, so we just
20120 piggyback on the existing location code rather than writing
20121 a new implementation of symbol_computed_ops. */
20122 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
20123 (*baton)->per_cu = cu->per_cu;
20124 gdb_assert ((*baton)->per_cu);
20126 (*baton)->size = 2 + cu_header->addr_size;
20127 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
20128 (*baton)->data = data;
20130 data[0] = DW_OP_addr;
20131 store_unsigned_integer (&data[1], cu_header->addr_size,
20132 byte_order, DW_ADDR (attr));
20133 data[cu_header->addr_size + 1] = DW_OP_stack_value;
20136 case DW_FORM_string:
20138 case DW_FORM_GNU_str_index:
20139 case DW_FORM_GNU_strp_alt:
20140 /* DW_STRING is already allocated on the objfile obstack, point
20142 *bytes = (const gdb_byte *) DW_STRING (attr);
20144 case DW_FORM_block1:
20145 case DW_FORM_block2:
20146 case DW_FORM_block4:
20147 case DW_FORM_block:
20148 case DW_FORM_exprloc:
20149 case DW_FORM_data16:
20150 blk = DW_BLOCK (attr);
20151 if (TYPE_LENGTH (type) != blk->size)
20152 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
20153 TYPE_LENGTH (type));
20154 *bytes = blk->data;
20157 /* The DW_AT_const_value attributes are supposed to carry the
20158 symbol's value "represented as it would be on the target
20159 architecture." By the time we get here, it's already been
20160 converted to host endianness, so we just need to sign- or
20161 zero-extend it as appropriate. */
20162 case DW_FORM_data1:
20163 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
20165 case DW_FORM_data2:
20166 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
20168 case DW_FORM_data4:
20169 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
20171 case DW_FORM_data8:
20172 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
20175 case DW_FORM_sdata:
20176 case DW_FORM_implicit_const:
20177 *value = DW_SND (attr);
20180 case DW_FORM_udata:
20181 *value = DW_UNSND (attr);
20185 complaint (&symfile_complaints,
20186 _("unsupported const value attribute form: '%s'"),
20187 dwarf_form_name (attr->form));
20194 /* Copy constant value from an attribute to a symbol. */
20197 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
20198 struct dwarf2_cu *cu)
20200 struct objfile *objfile = cu->objfile;
20202 const gdb_byte *bytes;
20203 struct dwarf2_locexpr_baton *baton;
20205 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
20206 SYMBOL_PRINT_NAME (sym),
20207 &objfile->objfile_obstack, cu,
20208 &value, &bytes, &baton);
20212 SYMBOL_LOCATION_BATON (sym) = baton;
20213 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
20215 else if (bytes != NULL)
20217 SYMBOL_VALUE_BYTES (sym) = bytes;
20218 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
20222 SYMBOL_VALUE (sym) = value;
20223 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
20227 /* Return the type of the die in question using its DW_AT_type attribute. */
20229 static struct type *
20230 die_type (struct die_info *die, struct dwarf2_cu *cu)
20232 struct attribute *type_attr;
20234 type_attr = dwarf2_attr (die, DW_AT_type, cu);
20237 /* A missing DW_AT_type represents a void type. */
20238 return objfile_type (cu->objfile)->builtin_void;
20241 return lookup_die_type (die, type_attr, cu);
20244 /* True iff CU's producer generates GNAT Ada auxiliary information
20245 that allows to find parallel types through that information instead
20246 of having to do expensive parallel lookups by type name. */
20249 need_gnat_info (struct dwarf2_cu *cu)
20251 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
20252 of GNAT produces this auxiliary information, without any indication
20253 that it is produced. Part of enhancing the FSF version of GNAT
20254 to produce that information will be to put in place an indicator
20255 that we can use in order to determine whether the descriptive type
20256 info is available or not. One suggestion that has been made is
20257 to use a new attribute, attached to the CU die. For now, assume
20258 that the descriptive type info is not available. */
20262 /* Return the auxiliary type of the die in question using its
20263 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
20264 attribute is not present. */
20266 static struct type *
20267 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
20269 struct attribute *type_attr;
20271 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
20275 return lookup_die_type (die, type_attr, cu);
20278 /* If DIE has a descriptive_type attribute, then set the TYPE's
20279 descriptive type accordingly. */
20282 set_descriptive_type (struct type *type, struct die_info *die,
20283 struct dwarf2_cu *cu)
20285 struct type *descriptive_type = die_descriptive_type (die, cu);
20287 if (descriptive_type)
20289 ALLOCATE_GNAT_AUX_TYPE (type);
20290 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
20294 /* Return the containing type of the die in question using its
20295 DW_AT_containing_type attribute. */
20297 static struct type *
20298 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
20300 struct attribute *type_attr;
20302 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
20304 error (_("Dwarf Error: Problem turning containing type into gdb type "
20305 "[in module %s]"), objfile_name (cu->objfile));
20307 return lookup_die_type (die, type_attr, cu);
20310 /* Return an error marker type to use for the ill formed type in DIE/CU. */
20312 static struct type *
20313 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
20315 struct objfile *objfile = dwarf2_per_objfile->objfile;
20316 char *message, *saved;
20318 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
20319 objfile_name (objfile),
20320 to_underlying (cu->header.sect_off),
20321 to_underlying (die->sect_off));
20322 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
20323 message, strlen (message));
20326 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
20329 /* Look up the type of DIE in CU using its type attribute ATTR.
20330 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
20331 DW_AT_containing_type.
20332 If there is no type substitute an error marker. */
20334 static struct type *
20335 lookup_die_type (struct die_info *die, const struct attribute *attr,
20336 struct dwarf2_cu *cu)
20338 struct objfile *objfile = cu->objfile;
20339 struct type *this_type;
20341 gdb_assert (attr->name == DW_AT_type
20342 || attr->name == DW_AT_GNAT_descriptive_type
20343 || attr->name == DW_AT_containing_type);
20345 /* First see if we have it cached. */
20347 if (attr->form == DW_FORM_GNU_ref_alt)
20349 struct dwarf2_per_cu_data *per_cu;
20350 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
20352 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1, cu->objfile);
20353 this_type = get_die_type_at_offset (sect_off, per_cu);
20355 else if (attr_form_is_ref (attr))
20357 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
20359 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
20361 else if (attr->form == DW_FORM_ref_sig8)
20363 ULONGEST signature = DW_SIGNATURE (attr);
20365 return get_signatured_type (die, signature, cu);
20369 complaint (&symfile_complaints,
20370 _("Dwarf Error: Bad type attribute %s in DIE"
20371 " at 0x%x [in module %s]"),
20372 dwarf_attr_name (attr->name), to_underlying (die->sect_off),
20373 objfile_name (objfile));
20374 return build_error_marker_type (cu, die);
20377 /* If not cached we need to read it in. */
20379 if (this_type == NULL)
20381 struct die_info *type_die = NULL;
20382 struct dwarf2_cu *type_cu = cu;
20384 if (attr_form_is_ref (attr))
20385 type_die = follow_die_ref (die, attr, &type_cu);
20386 if (type_die == NULL)
20387 return build_error_marker_type (cu, die);
20388 /* If we find the type now, it's probably because the type came
20389 from an inter-CU reference and the type's CU got expanded before
20391 this_type = read_type_die (type_die, type_cu);
20394 /* If we still don't have a type use an error marker. */
20396 if (this_type == NULL)
20397 return build_error_marker_type (cu, die);
20402 /* Return the type in DIE, CU.
20403 Returns NULL for invalid types.
20405 This first does a lookup in die_type_hash,
20406 and only reads the die in if necessary.
20408 NOTE: This can be called when reading in partial or full symbols. */
20410 static struct type *
20411 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
20413 struct type *this_type;
20415 this_type = get_die_type (die, cu);
20419 return read_type_die_1 (die, cu);
20422 /* Read the type in DIE, CU.
20423 Returns NULL for invalid types. */
20425 static struct type *
20426 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
20428 struct type *this_type = NULL;
20432 case DW_TAG_class_type:
20433 case DW_TAG_interface_type:
20434 case DW_TAG_structure_type:
20435 case DW_TAG_union_type:
20436 this_type = read_structure_type (die, cu);
20438 case DW_TAG_enumeration_type:
20439 this_type = read_enumeration_type (die, cu);
20441 case DW_TAG_subprogram:
20442 case DW_TAG_subroutine_type:
20443 case DW_TAG_inlined_subroutine:
20444 this_type = read_subroutine_type (die, cu);
20446 case DW_TAG_array_type:
20447 this_type = read_array_type (die, cu);
20449 case DW_TAG_set_type:
20450 this_type = read_set_type (die, cu);
20452 case DW_TAG_pointer_type:
20453 this_type = read_tag_pointer_type (die, cu);
20455 case DW_TAG_ptr_to_member_type:
20456 this_type = read_tag_ptr_to_member_type (die, cu);
20458 case DW_TAG_reference_type:
20459 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
20461 case DW_TAG_rvalue_reference_type:
20462 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
20464 case DW_TAG_const_type:
20465 this_type = read_tag_const_type (die, cu);
20467 case DW_TAG_volatile_type:
20468 this_type = read_tag_volatile_type (die, cu);
20470 case DW_TAG_restrict_type:
20471 this_type = read_tag_restrict_type (die, cu);
20473 case DW_TAG_string_type:
20474 this_type = read_tag_string_type (die, cu);
20476 case DW_TAG_typedef:
20477 this_type = read_typedef (die, cu);
20479 case DW_TAG_subrange_type:
20480 this_type = read_subrange_type (die, cu);
20482 case DW_TAG_base_type:
20483 this_type = read_base_type (die, cu);
20485 case DW_TAG_unspecified_type:
20486 this_type = read_unspecified_type (die, cu);
20488 case DW_TAG_namespace:
20489 this_type = read_namespace_type (die, cu);
20491 case DW_TAG_module:
20492 this_type = read_module_type (die, cu);
20494 case DW_TAG_atomic_type:
20495 this_type = read_tag_atomic_type (die, cu);
20498 complaint (&symfile_complaints,
20499 _("unexpected tag in read_type_die: '%s'"),
20500 dwarf_tag_name (die->tag));
20507 /* See if we can figure out if the class lives in a namespace. We do
20508 this by looking for a member function; its demangled name will
20509 contain namespace info, if there is any.
20510 Return the computed name or NULL.
20511 Space for the result is allocated on the objfile's obstack.
20512 This is the full-die version of guess_partial_die_structure_name.
20513 In this case we know DIE has no useful parent. */
20516 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
20518 struct die_info *spec_die;
20519 struct dwarf2_cu *spec_cu;
20520 struct die_info *child;
20523 spec_die = die_specification (die, &spec_cu);
20524 if (spec_die != NULL)
20530 for (child = die->child;
20532 child = child->sibling)
20534 if (child->tag == DW_TAG_subprogram)
20536 const char *linkage_name = dw2_linkage_name (child, cu);
20538 if (linkage_name != NULL)
20541 = language_class_name_from_physname (cu->language_defn,
20545 if (actual_name != NULL)
20547 const char *die_name = dwarf2_name (die, cu);
20549 if (die_name != NULL
20550 && strcmp (die_name, actual_name) != 0)
20552 /* Strip off the class name from the full name.
20553 We want the prefix. */
20554 int die_name_len = strlen (die_name);
20555 int actual_name_len = strlen (actual_name);
20557 /* Test for '::' as a sanity check. */
20558 if (actual_name_len > die_name_len + 2
20559 && actual_name[actual_name_len
20560 - die_name_len - 1] == ':')
20561 name = (char *) obstack_copy0 (
20562 &cu->objfile->per_bfd->storage_obstack,
20563 actual_name, actual_name_len - die_name_len - 2);
20566 xfree (actual_name);
20575 /* GCC might emit a nameless typedef that has a linkage name. Determine the
20576 prefix part in such case. See
20577 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
20579 static const char *
20580 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
20582 struct attribute *attr;
20585 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
20586 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
20589 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
20592 attr = dw2_linkage_name_attr (die, cu);
20593 if (attr == NULL || DW_STRING (attr) == NULL)
20596 /* dwarf2_name had to be already called. */
20597 gdb_assert (DW_STRING_IS_CANONICAL (attr));
20599 /* Strip the base name, keep any leading namespaces/classes. */
20600 base = strrchr (DW_STRING (attr), ':');
20601 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
20604 return (char *) obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
20606 &base[-1] - DW_STRING (attr));
20609 /* Return the name of the namespace/class that DIE is defined within,
20610 or "" if we can't tell. The caller should not xfree the result.
20612 For example, if we're within the method foo() in the following
20622 then determine_prefix on foo's die will return "N::C". */
20624 static const char *
20625 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
20627 struct die_info *parent, *spec_die;
20628 struct dwarf2_cu *spec_cu;
20629 struct type *parent_type;
20630 const char *retval;
20632 if (cu->language != language_cplus
20633 && cu->language != language_fortran && cu->language != language_d
20634 && cu->language != language_rust)
20637 retval = anonymous_struct_prefix (die, cu);
20641 /* We have to be careful in the presence of DW_AT_specification.
20642 For example, with GCC 3.4, given the code
20646 // Definition of N::foo.
20650 then we'll have a tree of DIEs like this:
20652 1: DW_TAG_compile_unit
20653 2: DW_TAG_namespace // N
20654 3: DW_TAG_subprogram // declaration of N::foo
20655 4: DW_TAG_subprogram // definition of N::foo
20656 DW_AT_specification // refers to die #3
20658 Thus, when processing die #4, we have to pretend that we're in
20659 the context of its DW_AT_specification, namely the contex of die
20662 spec_die = die_specification (die, &spec_cu);
20663 if (spec_die == NULL)
20664 parent = die->parent;
20667 parent = spec_die->parent;
20671 if (parent == NULL)
20673 else if (parent->building_fullname)
20676 const char *parent_name;
20678 /* It has been seen on RealView 2.2 built binaries,
20679 DW_TAG_template_type_param types actually _defined_ as
20680 children of the parent class:
20683 template class <class Enum> Class{};
20684 Class<enum E> class_e;
20686 1: DW_TAG_class_type (Class)
20687 2: DW_TAG_enumeration_type (E)
20688 3: DW_TAG_enumerator (enum1:0)
20689 3: DW_TAG_enumerator (enum2:1)
20691 2: DW_TAG_template_type_param
20692 DW_AT_type DW_FORM_ref_udata (E)
20694 Besides being broken debug info, it can put GDB into an
20695 infinite loop. Consider:
20697 When we're building the full name for Class<E>, we'll start
20698 at Class, and go look over its template type parameters,
20699 finding E. We'll then try to build the full name of E, and
20700 reach here. We're now trying to build the full name of E,
20701 and look over the parent DIE for containing scope. In the
20702 broken case, if we followed the parent DIE of E, we'd again
20703 find Class, and once again go look at its template type
20704 arguments, etc., etc. Simply don't consider such parent die
20705 as source-level parent of this die (it can't be, the language
20706 doesn't allow it), and break the loop here. */
20707 name = dwarf2_name (die, cu);
20708 parent_name = dwarf2_name (parent, cu);
20709 complaint (&symfile_complaints,
20710 _("template param type '%s' defined within parent '%s'"),
20711 name ? name : "<unknown>",
20712 parent_name ? parent_name : "<unknown>");
20716 switch (parent->tag)
20718 case DW_TAG_namespace:
20719 parent_type = read_type_die (parent, cu);
20720 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
20721 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
20722 Work around this problem here. */
20723 if (cu->language == language_cplus
20724 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
20726 /* We give a name to even anonymous namespaces. */
20727 return TYPE_TAG_NAME (parent_type);
20728 case DW_TAG_class_type:
20729 case DW_TAG_interface_type:
20730 case DW_TAG_structure_type:
20731 case DW_TAG_union_type:
20732 case DW_TAG_module:
20733 parent_type = read_type_die (parent, cu);
20734 if (TYPE_TAG_NAME (parent_type) != NULL)
20735 return TYPE_TAG_NAME (parent_type);
20737 /* An anonymous structure is only allowed non-static data
20738 members; no typedefs, no member functions, et cetera.
20739 So it does not need a prefix. */
20741 case DW_TAG_compile_unit:
20742 case DW_TAG_partial_unit:
20743 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
20744 if (cu->language == language_cplus
20745 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
20746 && die->child != NULL
20747 && (die->tag == DW_TAG_class_type
20748 || die->tag == DW_TAG_structure_type
20749 || die->tag == DW_TAG_union_type))
20751 char *name = guess_full_die_structure_name (die, cu);
20756 case DW_TAG_enumeration_type:
20757 parent_type = read_type_die (parent, cu);
20758 if (TYPE_DECLARED_CLASS (parent_type))
20760 if (TYPE_TAG_NAME (parent_type) != NULL)
20761 return TYPE_TAG_NAME (parent_type);
20764 /* Fall through. */
20766 return determine_prefix (parent, cu);
20770 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
20771 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
20772 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
20773 an obconcat, otherwise allocate storage for the result. The CU argument is
20774 used to determine the language and hence, the appropriate separator. */
20776 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
20779 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
20780 int physname, struct dwarf2_cu *cu)
20782 const char *lead = "";
20785 if (suffix == NULL || suffix[0] == '\0'
20786 || prefix == NULL || prefix[0] == '\0')
20788 else if (cu->language == language_d)
20790 /* For D, the 'main' function could be defined in any module, but it
20791 should never be prefixed. */
20792 if (strcmp (suffix, "D main") == 0)
20800 else if (cu->language == language_fortran && physname)
20802 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
20803 DW_AT_MIPS_linkage_name is preferred and used instead. */
20811 if (prefix == NULL)
20813 if (suffix == NULL)
20820 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
20822 strcpy (retval, lead);
20823 strcat (retval, prefix);
20824 strcat (retval, sep);
20825 strcat (retval, suffix);
20830 /* We have an obstack. */
20831 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
20835 /* Return sibling of die, NULL if no sibling. */
20837 static struct die_info *
20838 sibling_die (struct die_info *die)
20840 return die->sibling;
20843 /* Get name of a die, return NULL if not found. */
20845 static const char *
20846 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
20847 struct obstack *obstack)
20849 if (name && cu->language == language_cplus)
20851 std::string canon_name = cp_canonicalize_string (name);
20853 if (!canon_name.empty ())
20855 if (canon_name != name)
20856 name = (const char *) obstack_copy0 (obstack,
20857 canon_name.c_str (),
20858 canon_name.length ());
20865 /* Get name of a die, return NULL if not found.
20866 Anonymous namespaces are converted to their magic string. */
20868 static const char *
20869 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
20871 struct attribute *attr;
20873 attr = dwarf2_attr (die, DW_AT_name, cu);
20874 if ((!attr || !DW_STRING (attr))
20875 && die->tag != DW_TAG_namespace
20876 && die->tag != DW_TAG_class_type
20877 && die->tag != DW_TAG_interface_type
20878 && die->tag != DW_TAG_structure_type
20879 && die->tag != DW_TAG_union_type)
20884 case DW_TAG_compile_unit:
20885 case DW_TAG_partial_unit:
20886 /* Compilation units have a DW_AT_name that is a filename, not
20887 a source language identifier. */
20888 case DW_TAG_enumeration_type:
20889 case DW_TAG_enumerator:
20890 /* These tags always have simple identifiers already; no need
20891 to canonicalize them. */
20892 return DW_STRING (attr);
20894 case DW_TAG_namespace:
20895 if (attr != NULL && DW_STRING (attr) != NULL)
20896 return DW_STRING (attr);
20897 return CP_ANONYMOUS_NAMESPACE_STR;
20899 case DW_TAG_class_type:
20900 case DW_TAG_interface_type:
20901 case DW_TAG_structure_type:
20902 case DW_TAG_union_type:
20903 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
20904 structures or unions. These were of the form "._%d" in GCC 4.1,
20905 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
20906 and GCC 4.4. We work around this problem by ignoring these. */
20907 if (attr && DW_STRING (attr)
20908 && (startswith (DW_STRING (attr), "._")
20909 || startswith (DW_STRING (attr), "<anonymous")))
20912 /* GCC might emit a nameless typedef that has a linkage name. See
20913 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
20914 if (!attr || DW_STRING (attr) == NULL)
20916 char *demangled = NULL;
20918 attr = dw2_linkage_name_attr (die, cu);
20919 if (attr == NULL || DW_STRING (attr) == NULL)
20922 /* Avoid demangling DW_STRING (attr) the second time on a second
20923 call for the same DIE. */
20924 if (!DW_STRING_IS_CANONICAL (attr))
20925 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
20931 /* FIXME: we already did this for the partial symbol... */
20934 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
20935 demangled, strlen (demangled)));
20936 DW_STRING_IS_CANONICAL (attr) = 1;
20939 /* Strip any leading namespaces/classes, keep only the base name.
20940 DW_AT_name for named DIEs does not contain the prefixes. */
20941 base = strrchr (DW_STRING (attr), ':');
20942 if (base && base > DW_STRING (attr) && base[-1] == ':')
20945 return DW_STRING (attr);
20954 if (!DW_STRING_IS_CANONICAL (attr))
20957 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
20958 &cu->objfile->per_bfd->storage_obstack);
20959 DW_STRING_IS_CANONICAL (attr) = 1;
20961 return DW_STRING (attr);
20964 /* Return the die that this die in an extension of, or NULL if there
20965 is none. *EXT_CU is the CU containing DIE on input, and the CU
20966 containing the return value on output. */
20968 static struct die_info *
20969 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
20971 struct attribute *attr;
20973 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
20977 return follow_die_ref (die, attr, ext_cu);
20980 /* Convert a DIE tag into its string name. */
20982 static const char *
20983 dwarf_tag_name (unsigned tag)
20985 const char *name = get_DW_TAG_name (tag);
20988 return "DW_TAG_<unknown>";
20993 /* Convert a DWARF attribute code into its string name. */
20995 static const char *
20996 dwarf_attr_name (unsigned attr)
21000 #ifdef MIPS /* collides with DW_AT_HP_block_index */
21001 if (attr == DW_AT_MIPS_fde)
21002 return "DW_AT_MIPS_fde";
21004 if (attr == DW_AT_HP_block_index)
21005 return "DW_AT_HP_block_index";
21008 name = get_DW_AT_name (attr);
21011 return "DW_AT_<unknown>";
21016 /* Convert a DWARF value form code into its string name. */
21018 static const char *
21019 dwarf_form_name (unsigned form)
21021 const char *name = get_DW_FORM_name (form);
21024 return "DW_FORM_<unknown>";
21029 static const char *
21030 dwarf_bool_name (unsigned mybool)
21038 /* Convert a DWARF type code into its string name. */
21040 static const char *
21041 dwarf_type_encoding_name (unsigned enc)
21043 const char *name = get_DW_ATE_name (enc);
21046 return "DW_ATE_<unknown>";
21052 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
21056 print_spaces (indent, f);
21057 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
21058 dwarf_tag_name (die->tag), die->abbrev,
21059 to_underlying (die->sect_off));
21061 if (die->parent != NULL)
21063 print_spaces (indent, f);
21064 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
21065 to_underlying (die->parent->sect_off));
21068 print_spaces (indent, f);
21069 fprintf_unfiltered (f, " has children: %s\n",
21070 dwarf_bool_name (die->child != NULL));
21072 print_spaces (indent, f);
21073 fprintf_unfiltered (f, " attributes:\n");
21075 for (i = 0; i < die->num_attrs; ++i)
21077 print_spaces (indent, f);
21078 fprintf_unfiltered (f, " %s (%s) ",
21079 dwarf_attr_name (die->attrs[i].name),
21080 dwarf_form_name (die->attrs[i].form));
21082 switch (die->attrs[i].form)
21085 case DW_FORM_GNU_addr_index:
21086 fprintf_unfiltered (f, "address: ");
21087 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
21089 case DW_FORM_block2:
21090 case DW_FORM_block4:
21091 case DW_FORM_block:
21092 case DW_FORM_block1:
21093 fprintf_unfiltered (f, "block: size %s",
21094 pulongest (DW_BLOCK (&die->attrs[i])->size));
21096 case DW_FORM_exprloc:
21097 fprintf_unfiltered (f, "expression: size %s",
21098 pulongest (DW_BLOCK (&die->attrs[i])->size));
21100 case DW_FORM_data16:
21101 fprintf_unfiltered (f, "constant of 16 bytes");
21103 case DW_FORM_ref_addr:
21104 fprintf_unfiltered (f, "ref address: ");
21105 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
21107 case DW_FORM_GNU_ref_alt:
21108 fprintf_unfiltered (f, "alt ref address: ");
21109 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
21115 case DW_FORM_ref_udata:
21116 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
21117 (long) (DW_UNSND (&die->attrs[i])));
21119 case DW_FORM_data1:
21120 case DW_FORM_data2:
21121 case DW_FORM_data4:
21122 case DW_FORM_data8:
21123 case DW_FORM_udata:
21124 case DW_FORM_sdata:
21125 fprintf_unfiltered (f, "constant: %s",
21126 pulongest (DW_UNSND (&die->attrs[i])));
21128 case DW_FORM_sec_offset:
21129 fprintf_unfiltered (f, "section offset: %s",
21130 pulongest (DW_UNSND (&die->attrs[i])));
21132 case DW_FORM_ref_sig8:
21133 fprintf_unfiltered (f, "signature: %s",
21134 hex_string (DW_SIGNATURE (&die->attrs[i])));
21136 case DW_FORM_string:
21138 case DW_FORM_line_strp:
21139 case DW_FORM_GNU_str_index:
21140 case DW_FORM_GNU_strp_alt:
21141 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
21142 DW_STRING (&die->attrs[i])
21143 ? DW_STRING (&die->attrs[i]) : "",
21144 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
21147 if (DW_UNSND (&die->attrs[i]))
21148 fprintf_unfiltered (f, "flag: TRUE");
21150 fprintf_unfiltered (f, "flag: FALSE");
21152 case DW_FORM_flag_present:
21153 fprintf_unfiltered (f, "flag: TRUE");
21155 case DW_FORM_indirect:
21156 /* The reader will have reduced the indirect form to
21157 the "base form" so this form should not occur. */
21158 fprintf_unfiltered (f,
21159 "unexpected attribute form: DW_FORM_indirect");
21161 case DW_FORM_implicit_const:
21162 fprintf_unfiltered (f, "constant: %s",
21163 plongest (DW_SND (&die->attrs[i])));
21166 fprintf_unfiltered (f, "unsupported attribute form: %d.",
21167 die->attrs[i].form);
21170 fprintf_unfiltered (f, "\n");
21175 dump_die_for_error (struct die_info *die)
21177 dump_die_shallow (gdb_stderr, 0, die);
21181 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
21183 int indent = level * 4;
21185 gdb_assert (die != NULL);
21187 if (level >= max_level)
21190 dump_die_shallow (f, indent, die);
21192 if (die->child != NULL)
21194 print_spaces (indent, f);
21195 fprintf_unfiltered (f, " Children:");
21196 if (level + 1 < max_level)
21198 fprintf_unfiltered (f, "\n");
21199 dump_die_1 (f, level + 1, max_level, die->child);
21203 fprintf_unfiltered (f,
21204 " [not printed, max nesting level reached]\n");
21208 if (die->sibling != NULL && level > 0)
21210 dump_die_1 (f, level, max_level, die->sibling);
21214 /* This is called from the pdie macro in gdbinit.in.
21215 It's not static so gcc will keep a copy callable from gdb. */
21218 dump_die (struct die_info *die, int max_level)
21220 dump_die_1 (gdb_stdlog, 0, max_level, die);
21224 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
21228 slot = htab_find_slot_with_hash (cu->die_hash, die,
21229 to_underlying (die->sect_off),
21235 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
21239 dwarf2_get_ref_die_offset (const struct attribute *attr)
21241 if (attr_form_is_ref (attr))
21242 return (sect_offset) DW_UNSND (attr);
21244 complaint (&symfile_complaints,
21245 _("unsupported die ref attribute form: '%s'"),
21246 dwarf_form_name (attr->form));
21250 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
21251 * the value held by the attribute is not constant. */
21254 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
21256 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
21257 return DW_SND (attr);
21258 else if (attr->form == DW_FORM_udata
21259 || attr->form == DW_FORM_data1
21260 || attr->form == DW_FORM_data2
21261 || attr->form == DW_FORM_data4
21262 || attr->form == DW_FORM_data8)
21263 return DW_UNSND (attr);
21266 /* For DW_FORM_data16 see attr_form_is_constant. */
21267 complaint (&symfile_complaints,
21268 _("Attribute value is not a constant (%s)"),
21269 dwarf_form_name (attr->form));
21270 return default_value;
21274 /* Follow reference or signature attribute ATTR of SRC_DIE.
21275 On entry *REF_CU is the CU of SRC_DIE.
21276 On exit *REF_CU is the CU of the result. */
21278 static struct die_info *
21279 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
21280 struct dwarf2_cu **ref_cu)
21282 struct die_info *die;
21284 if (attr_form_is_ref (attr))
21285 die = follow_die_ref (src_die, attr, ref_cu);
21286 else if (attr->form == DW_FORM_ref_sig8)
21287 die = follow_die_sig (src_die, attr, ref_cu);
21290 dump_die_for_error (src_die);
21291 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
21292 objfile_name ((*ref_cu)->objfile));
21298 /* Follow reference OFFSET.
21299 On entry *REF_CU is the CU of the source die referencing OFFSET.
21300 On exit *REF_CU is the CU of the result.
21301 Returns NULL if OFFSET is invalid. */
21303 static struct die_info *
21304 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
21305 struct dwarf2_cu **ref_cu)
21307 struct die_info temp_die;
21308 struct dwarf2_cu *target_cu, *cu = *ref_cu;
21310 gdb_assert (cu->per_cu != NULL);
21314 if (cu->per_cu->is_debug_types)
21316 /* .debug_types CUs cannot reference anything outside their CU.
21317 If they need to, they have to reference a signatured type via
21318 DW_FORM_ref_sig8. */
21319 if (!offset_in_cu_p (&cu->header, sect_off))
21322 else if (offset_in_dwz != cu->per_cu->is_dwz
21323 || !offset_in_cu_p (&cu->header, sect_off))
21325 struct dwarf2_per_cu_data *per_cu;
21327 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
21330 /* If necessary, add it to the queue and load its DIEs. */
21331 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
21332 load_full_comp_unit (per_cu, cu->language);
21334 target_cu = per_cu->cu;
21336 else if (cu->dies == NULL)
21338 /* We're loading full DIEs during partial symbol reading. */
21339 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
21340 load_full_comp_unit (cu->per_cu, language_minimal);
21343 *ref_cu = target_cu;
21344 temp_die.sect_off = sect_off;
21345 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
21347 to_underlying (sect_off));
21350 /* Follow reference attribute ATTR of SRC_DIE.
21351 On entry *REF_CU is the CU of SRC_DIE.
21352 On exit *REF_CU is the CU of the result. */
21354 static struct die_info *
21355 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
21356 struct dwarf2_cu **ref_cu)
21358 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21359 struct dwarf2_cu *cu = *ref_cu;
21360 struct die_info *die;
21362 die = follow_die_offset (sect_off,
21363 (attr->form == DW_FORM_GNU_ref_alt
21364 || cu->per_cu->is_dwz),
21367 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
21368 "at 0x%x [in module %s]"),
21369 to_underlying (sect_off), to_underlying (src_die->sect_off),
21370 objfile_name (cu->objfile));
21375 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
21376 Returned value is intended for DW_OP_call*. Returned
21377 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
21379 struct dwarf2_locexpr_baton
21380 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
21381 struct dwarf2_per_cu_data *per_cu,
21382 CORE_ADDR (*get_frame_pc) (void *baton),
21385 struct dwarf2_cu *cu;
21386 struct die_info *die;
21387 struct attribute *attr;
21388 struct dwarf2_locexpr_baton retval;
21390 dw2_setup (per_cu->objfile);
21392 if (per_cu->cu == NULL)
21397 /* We shouldn't get here for a dummy CU, but don't crash on the user.
21398 Instead just throw an error, not much else we can do. */
21399 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
21400 to_underlying (sect_off), objfile_name (per_cu->objfile));
21403 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
21405 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
21406 to_underlying (sect_off), objfile_name (per_cu->objfile));
21408 attr = dwarf2_attr (die, DW_AT_location, cu);
21411 /* DWARF: "If there is no such attribute, then there is no effect.".
21412 DATA is ignored if SIZE is 0. */
21414 retval.data = NULL;
21417 else if (attr_form_is_section_offset (attr))
21419 struct dwarf2_loclist_baton loclist_baton;
21420 CORE_ADDR pc = (*get_frame_pc) (baton);
21423 fill_in_loclist_baton (cu, &loclist_baton, attr);
21425 retval.data = dwarf2_find_location_expression (&loclist_baton,
21427 retval.size = size;
21431 if (!attr_form_is_block (attr))
21432 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
21433 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
21434 to_underlying (sect_off), objfile_name (per_cu->objfile));
21436 retval.data = DW_BLOCK (attr)->data;
21437 retval.size = DW_BLOCK (attr)->size;
21439 retval.per_cu = cu->per_cu;
21441 age_cached_comp_units ();
21446 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
21449 struct dwarf2_locexpr_baton
21450 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
21451 struct dwarf2_per_cu_data *per_cu,
21452 CORE_ADDR (*get_frame_pc) (void *baton),
21455 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
21457 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
21460 /* Write a constant of a given type as target-ordered bytes into
21463 static const gdb_byte *
21464 write_constant_as_bytes (struct obstack *obstack,
21465 enum bfd_endian byte_order,
21472 *len = TYPE_LENGTH (type);
21473 result = (gdb_byte *) obstack_alloc (obstack, *len);
21474 store_unsigned_integer (result, *len, byte_order, value);
21479 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
21480 pointer to the constant bytes and set LEN to the length of the
21481 data. If memory is needed, allocate it on OBSTACK. If the DIE
21482 does not have a DW_AT_const_value, return NULL. */
21485 dwarf2_fetch_constant_bytes (sect_offset sect_off,
21486 struct dwarf2_per_cu_data *per_cu,
21487 struct obstack *obstack,
21490 struct dwarf2_cu *cu;
21491 struct die_info *die;
21492 struct attribute *attr;
21493 const gdb_byte *result = NULL;
21496 enum bfd_endian byte_order;
21498 dw2_setup (per_cu->objfile);
21500 if (per_cu->cu == NULL)
21505 /* We shouldn't get here for a dummy CU, but don't crash on the user.
21506 Instead just throw an error, not much else we can do. */
21507 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
21508 to_underlying (sect_off), objfile_name (per_cu->objfile));
21511 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
21513 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
21514 to_underlying (sect_off), objfile_name (per_cu->objfile));
21517 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21521 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
21522 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21524 switch (attr->form)
21527 case DW_FORM_GNU_addr_index:
21531 *len = cu->header.addr_size;
21532 tem = (gdb_byte *) obstack_alloc (obstack, *len);
21533 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
21537 case DW_FORM_string:
21539 case DW_FORM_GNU_str_index:
21540 case DW_FORM_GNU_strp_alt:
21541 /* DW_STRING is already allocated on the objfile obstack, point
21543 result = (const gdb_byte *) DW_STRING (attr);
21544 *len = strlen (DW_STRING (attr));
21546 case DW_FORM_block1:
21547 case DW_FORM_block2:
21548 case DW_FORM_block4:
21549 case DW_FORM_block:
21550 case DW_FORM_exprloc:
21551 case DW_FORM_data16:
21552 result = DW_BLOCK (attr)->data;
21553 *len = DW_BLOCK (attr)->size;
21556 /* The DW_AT_const_value attributes are supposed to carry the
21557 symbol's value "represented as it would be on the target
21558 architecture." By the time we get here, it's already been
21559 converted to host endianness, so we just need to sign- or
21560 zero-extend it as appropriate. */
21561 case DW_FORM_data1:
21562 type = die_type (die, cu);
21563 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
21564 if (result == NULL)
21565 result = write_constant_as_bytes (obstack, byte_order,
21568 case DW_FORM_data2:
21569 type = die_type (die, cu);
21570 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
21571 if (result == NULL)
21572 result = write_constant_as_bytes (obstack, byte_order,
21575 case DW_FORM_data4:
21576 type = die_type (die, cu);
21577 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
21578 if (result == NULL)
21579 result = write_constant_as_bytes (obstack, byte_order,
21582 case DW_FORM_data8:
21583 type = die_type (die, cu);
21584 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
21585 if (result == NULL)
21586 result = write_constant_as_bytes (obstack, byte_order,
21590 case DW_FORM_sdata:
21591 case DW_FORM_implicit_const:
21592 type = die_type (die, cu);
21593 result = write_constant_as_bytes (obstack, byte_order,
21594 type, DW_SND (attr), len);
21597 case DW_FORM_udata:
21598 type = die_type (die, cu);
21599 result = write_constant_as_bytes (obstack, byte_order,
21600 type, DW_UNSND (attr), len);
21604 complaint (&symfile_complaints,
21605 _("unsupported const value attribute form: '%s'"),
21606 dwarf_form_name (attr->form));
21613 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
21614 valid type for this die is found. */
21617 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
21618 struct dwarf2_per_cu_data *per_cu)
21620 struct dwarf2_cu *cu;
21621 struct die_info *die;
21623 dw2_setup (per_cu->objfile);
21625 if (per_cu->cu == NULL)
21631 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
21635 return die_type (die, cu);
21638 /* Return the type of the DIE at DIE_OFFSET in the CU named by
21642 dwarf2_get_die_type (cu_offset die_offset,
21643 struct dwarf2_per_cu_data *per_cu)
21645 dw2_setup (per_cu->objfile);
21647 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
21648 return get_die_type_at_offset (die_offset_sect, per_cu);
21651 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
21652 On entry *REF_CU is the CU of SRC_DIE.
21653 On exit *REF_CU is the CU of the result.
21654 Returns NULL if the referenced DIE isn't found. */
21656 static struct die_info *
21657 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
21658 struct dwarf2_cu **ref_cu)
21660 struct die_info temp_die;
21661 struct dwarf2_cu *sig_cu;
21662 struct die_info *die;
21664 /* While it might be nice to assert sig_type->type == NULL here,
21665 we can get here for DW_AT_imported_declaration where we need
21666 the DIE not the type. */
21668 /* If necessary, add it to the queue and load its DIEs. */
21670 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
21671 read_signatured_type (sig_type);
21673 sig_cu = sig_type->per_cu.cu;
21674 gdb_assert (sig_cu != NULL);
21675 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
21676 temp_die.sect_off = sig_type->type_offset_in_section;
21677 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
21678 to_underlying (temp_die.sect_off));
21681 /* For .gdb_index version 7 keep track of included TUs.
21682 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
21683 if (dwarf2_per_objfile->index_table != NULL
21684 && dwarf2_per_objfile->index_table->version <= 7)
21686 VEC_safe_push (dwarf2_per_cu_ptr,
21687 (*ref_cu)->per_cu->imported_symtabs,
21698 /* Follow signatured type referenced by ATTR in SRC_DIE.
21699 On entry *REF_CU is the CU of SRC_DIE.
21700 On exit *REF_CU is the CU of the result.
21701 The result is the DIE of the type.
21702 If the referenced type cannot be found an error is thrown. */
21704 static struct die_info *
21705 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
21706 struct dwarf2_cu **ref_cu)
21708 ULONGEST signature = DW_SIGNATURE (attr);
21709 struct signatured_type *sig_type;
21710 struct die_info *die;
21712 gdb_assert (attr->form == DW_FORM_ref_sig8);
21714 sig_type = lookup_signatured_type (*ref_cu, signature);
21715 /* sig_type will be NULL if the signatured type is missing from
21717 if (sig_type == NULL)
21719 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
21720 " from DIE at 0x%x [in module %s]"),
21721 hex_string (signature), to_underlying (src_die->sect_off),
21722 objfile_name ((*ref_cu)->objfile));
21725 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
21728 dump_die_for_error (src_die);
21729 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
21730 " from DIE at 0x%x [in module %s]"),
21731 hex_string (signature), to_underlying (src_die->sect_off),
21732 objfile_name ((*ref_cu)->objfile));
21738 /* Get the type specified by SIGNATURE referenced in DIE/CU,
21739 reading in and processing the type unit if necessary. */
21741 static struct type *
21742 get_signatured_type (struct die_info *die, ULONGEST signature,
21743 struct dwarf2_cu *cu)
21745 struct signatured_type *sig_type;
21746 struct dwarf2_cu *type_cu;
21747 struct die_info *type_die;
21750 sig_type = lookup_signatured_type (cu, signature);
21751 /* sig_type will be NULL if the signatured type is missing from
21753 if (sig_type == NULL)
21755 complaint (&symfile_complaints,
21756 _("Dwarf Error: Cannot find signatured DIE %s referenced"
21757 " from DIE at 0x%x [in module %s]"),
21758 hex_string (signature), to_underlying (die->sect_off),
21759 objfile_name (dwarf2_per_objfile->objfile));
21760 return build_error_marker_type (cu, die);
21763 /* If we already know the type we're done. */
21764 if (sig_type->type != NULL)
21765 return sig_type->type;
21768 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
21769 if (type_die != NULL)
21771 /* N.B. We need to call get_die_type to ensure only one type for this DIE
21772 is created. This is important, for example, because for c++ classes
21773 we need TYPE_NAME set which is only done by new_symbol. Blech. */
21774 type = read_type_die (type_die, type_cu);
21777 complaint (&symfile_complaints,
21778 _("Dwarf Error: Cannot build signatured type %s"
21779 " referenced from DIE at 0x%x [in module %s]"),
21780 hex_string (signature), to_underlying (die->sect_off),
21781 objfile_name (dwarf2_per_objfile->objfile));
21782 type = build_error_marker_type (cu, die);
21787 complaint (&symfile_complaints,
21788 _("Dwarf Error: Problem reading signatured DIE %s referenced"
21789 " from DIE at 0x%x [in module %s]"),
21790 hex_string (signature), to_underlying (die->sect_off),
21791 objfile_name (dwarf2_per_objfile->objfile));
21792 type = build_error_marker_type (cu, die);
21794 sig_type->type = type;
21799 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
21800 reading in and processing the type unit if necessary. */
21802 static struct type *
21803 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
21804 struct dwarf2_cu *cu) /* ARI: editCase function */
21806 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
21807 if (attr_form_is_ref (attr))
21809 struct dwarf2_cu *type_cu = cu;
21810 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
21812 return read_type_die (type_die, type_cu);
21814 else if (attr->form == DW_FORM_ref_sig8)
21816 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
21820 complaint (&symfile_complaints,
21821 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
21822 " at 0x%x [in module %s]"),
21823 dwarf_form_name (attr->form), to_underlying (die->sect_off),
21824 objfile_name (dwarf2_per_objfile->objfile));
21825 return build_error_marker_type (cu, die);
21829 /* Load the DIEs associated with type unit PER_CU into memory. */
21832 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
21834 struct signatured_type *sig_type;
21836 /* Caller is responsible for ensuring type_unit_groups don't get here. */
21837 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
21839 /* We have the per_cu, but we need the signatured_type.
21840 Fortunately this is an easy translation. */
21841 gdb_assert (per_cu->is_debug_types);
21842 sig_type = (struct signatured_type *) per_cu;
21844 gdb_assert (per_cu->cu == NULL);
21846 read_signatured_type (sig_type);
21848 gdb_assert (per_cu->cu != NULL);
21851 /* die_reader_func for read_signatured_type.
21852 This is identical to load_full_comp_unit_reader,
21853 but is kept separate for now. */
21856 read_signatured_type_reader (const struct die_reader_specs *reader,
21857 const gdb_byte *info_ptr,
21858 struct die_info *comp_unit_die,
21862 struct dwarf2_cu *cu = reader->cu;
21864 gdb_assert (cu->die_hash == NULL);
21866 htab_create_alloc_ex (cu->header.length / 12,
21870 &cu->comp_unit_obstack,
21871 hashtab_obstack_allocate,
21872 dummy_obstack_deallocate);
21875 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
21876 &info_ptr, comp_unit_die);
21877 cu->dies = comp_unit_die;
21878 /* comp_unit_die is not stored in die_hash, no need. */
21880 /* We try not to read any attributes in this function, because not
21881 all CUs needed for references have been loaded yet, and symbol
21882 table processing isn't initialized. But we have to set the CU language,
21883 or we won't be able to build types correctly.
21884 Similarly, if we do not read the producer, we can not apply
21885 producer-specific interpretation. */
21886 prepare_one_comp_unit (cu, cu->dies, language_minimal);
21889 /* Read in a signatured type and build its CU and DIEs.
21890 If the type is a stub for the real type in a DWO file,
21891 read in the real type from the DWO file as well. */
21894 read_signatured_type (struct signatured_type *sig_type)
21896 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
21898 gdb_assert (per_cu->is_debug_types);
21899 gdb_assert (per_cu->cu == NULL);
21901 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
21902 read_signatured_type_reader, NULL);
21903 sig_type->per_cu.tu_read = 1;
21906 /* Decode simple location descriptions.
21907 Given a pointer to a dwarf block that defines a location, compute
21908 the location and return the value.
21910 NOTE drow/2003-11-18: This function is called in two situations
21911 now: for the address of static or global variables (partial symbols
21912 only) and for offsets into structures which are expected to be
21913 (more or less) constant. The partial symbol case should go away,
21914 and only the constant case should remain. That will let this
21915 function complain more accurately. A few special modes are allowed
21916 without complaint for global variables (for instance, global
21917 register values and thread-local values).
21919 A location description containing no operations indicates that the
21920 object is optimized out. The return value is 0 for that case.
21921 FIXME drow/2003-11-16: No callers check for this case any more; soon all
21922 callers will only want a very basic result and this can become a
21925 Note that stack[0] is unused except as a default error return. */
21928 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
21930 struct objfile *objfile = cu->objfile;
21932 size_t size = blk->size;
21933 const gdb_byte *data = blk->data;
21934 CORE_ADDR stack[64];
21936 unsigned int bytes_read, unsnd;
21942 stack[++stacki] = 0;
21981 stack[++stacki] = op - DW_OP_lit0;
22016 stack[++stacki] = op - DW_OP_reg0;
22018 dwarf2_complex_location_expr_complaint ();
22022 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
22024 stack[++stacki] = unsnd;
22026 dwarf2_complex_location_expr_complaint ();
22030 stack[++stacki] = read_address (objfile->obfd, &data[i],
22035 case DW_OP_const1u:
22036 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
22040 case DW_OP_const1s:
22041 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
22045 case DW_OP_const2u:
22046 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
22050 case DW_OP_const2s:
22051 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
22055 case DW_OP_const4u:
22056 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
22060 case DW_OP_const4s:
22061 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
22065 case DW_OP_const8u:
22066 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
22071 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
22077 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
22082 stack[stacki + 1] = stack[stacki];
22087 stack[stacki - 1] += stack[stacki];
22091 case DW_OP_plus_uconst:
22092 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
22098 stack[stacki - 1] -= stack[stacki];
22103 /* If we're not the last op, then we definitely can't encode
22104 this using GDB's address_class enum. This is valid for partial
22105 global symbols, although the variable's address will be bogus
22108 dwarf2_complex_location_expr_complaint ();
22111 case DW_OP_GNU_push_tls_address:
22112 case DW_OP_form_tls_address:
22113 /* The top of the stack has the offset from the beginning
22114 of the thread control block at which the variable is located. */
22115 /* Nothing should follow this operator, so the top of stack would
22117 /* This is valid for partial global symbols, but the variable's
22118 address will be bogus in the psymtab. Make it always at least
22119 non-zero to not look as a variable garbage collected by linker
22120 which have DW_OP_addr 0. */
22122 dwarf2_complex_location_expr_complaint ();
22126 case DW_OP_GNU_uninit:
22129 case DW_OP_GNU_addr_index:
22130 case DW_OP_GNU_const_index:
22131 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
22138 const char *name = get_DW_OP_name (op);
22141 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
22144 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
22148 return (stack[stacki]);
22151 /* Enforce maximum stack depth of SIZE-1 to avoid writing
22152 outside of the allocated space. Also enforce minimum>0. */
22153 if (stacki >= ARRAY_SIZE (stack) - 1)
22155 complaint (&symfile_complaints,
22156 _("location description stack overflow"));
22162 complaint (&symfile_complaints,
22163 _("location description stack underflow"));
22167 return (stack[stacki]);
22170 /* memory allocation interface */
22172 static struct dwarf_block *
22173 dwarf_alloc_block (struct dwarf2_cu *cu)
22175 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
22178 static struct die_info *
22179 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
22181 struct die_info *die;
22182 size_t size = sizeof (struct die_info);
22185 size += (num_attrs - 1) * sizeof (struct attribute);
22187 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
22188 memset (die, 0, sizeof (struct die_info));
22193 /* Macro support. */
22195 /* Return file name relative to the compilation directory of file number I in
22196 *LH's file name table. The result is allocated using xmalloc; the caller is
22197 responsible for freeing it. */
22200 file_file_name (int file, struct line_header *lh)
22202 /* Is the file number a valid index into the line header's file name
22203 table? Remember that file numbers start with one, not zero. */
22204 if (1 <= file && file <= lh->file_names.size ())
22206 const file_entry &fe = lh->file_names[file - 1];
22208 if (!IS_ABSOLUTE_PATH (fe.name))
22210 const char *dir = fe.include_dir (lh);
22212 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
22214 return xstrdup (fe.name);
22218 /* The compiler produced a bogus file number. We can at least
22219 record the macro definitions made in the file, even if we
22220 won't be able to find the file by name. */
22221 char fake_name[80];
22223 xsnprintf (fake_name, sizeof (fake_name),
22224 "<bad macro file number %d>", file);
22226 complaint (&symfile_complaints,
22227 _("bad file number in macro information (%d)"),
22230 return xstrdup (fake_name);
22234 /* Return the full name of file number I in *LH's file name table.
22235 Use COMP_DIR as the name of the current directory of the
22236 compilation. The result is allocated using xmalloc; the caller is
22237 responsible for freeing it. */
22239 file_full_name (int file, struct line_header *lh, const char *comp_dir)
22241 /* Is the file number a valid index into the line header's file name
22242 table? Remember that file numbers start with one, not zero. */
22243 if (1 <= file && file <= lh->file_names.size ())
22245 char *relative = file_file_name (file, lh);
22247 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
22249 return reconcat (relative, comp_dir, SLASH_STRING,
22250 relative, (char *) NULL);
22253 return file_file_name (file, lh);
22257 static struct macro_source_file *
22258 macro_start_file (int file, int line,
22259 struct macro_source_file *current_file,
22260 struct line_header *lh)
22262 /* File name relative to the compilation directory of this source file. */
22263 char *file_name = file_file_name (file, lh);
22265 if (! current_file)
22267 /* Note: We don't create a macro table for this compilation unit
22268 at all until we actually get a filename. */
22269 struct macro_table *macro_table = get_macro_table ();
22271 /* If we have no current file, then this must be the start_file
22272 directive for the compilation unit's main source file. */
22273 current_file = macro_set_main (macro_table, file_name);
22274 macro_define_special (macro_table);
22277 current_file = macro_include (current_file, line, file_name);
22281 return current_file;
22284 static const char *
22285 consume_improper_spaces (const char *p, const char *body)
22289 complaint (&symfile_complaints,
22290 _("macro definition contains spaces "
22291 "in formal argument list:\n`%s'"),
22303 parse_macro_definition (struct macro_source_file *file, int line,
22308 /* The body string takes one of two forms. For object-like macro
22309 definitions, it should be:
22311 <macro name> " " <definition>
22313 For function-like macro definitions, it should be:
22315 <macro name> "() " <definition>
22317 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
22319 Spaces may appear only where explicitly indicated, and in the
22322 The Dwarf 2 spec says that an object-like macro's name is always
22323 followed by a space, but versions of GCC around March 2002 omit
22324 the space when the macro's definition is the empty string.
22326 The Dwarf 2 spec says that there should be no spaces between the
22327 formal arguments in a function-like macro's formal argument list,
22328 but versions of GCC around March 2002 include spaces after the
22332 /* Find the extent of the macro name. The macro name is terminated
22333 by either a space or null character (for an object-like macro) or
22334 an opening paren (for a function-like macro). */
22335 for (p = body; *p; p++)
22336 if (*p == ' ' || *p == '(')
22339 if (*p == ' ' || *p == '\0')
22341 /* It's an object-like macro. */
22342 int name_len = p - body;
22343 char *name = savestring (body, name_len);
22344 const char *replacement;
22347 replacement = body + name_len + 1;
22350 dwarf2_macro_malformed_definition_complaint (body);
22351 replacement = body + name_len;
22354 macro_define_object (file, line, name, replacement);
22358 else if (*p == '(')
22360 /* It's a function-like macro. */
22361 char *name = savestring (body, p - body);
22364 char **argv = XNEWVEC (char *, argv_size);
22368 p = consume_improper_spaces (p, body);
22370 /* Parse the formal argument list. */
22371 while (*p && *p != ')')
22373 /* Find the extent of the current argument name. */
22374 const char *arg_start = p;
22376 while (*p && *p != ',' && *p != ')' && *p != ' ')
22379 if (! *p || p == arg_start)
22380 dwarf2_macro_malformed_definition_complaint (body);
22383 /* Make sure argv has room for the new argument. */
22384 if (argc >= argv_size)
22387 argv = XRESIZEVEC (char *, argv, argv_size);
22390 argv[argc++] = savestring (arg_start, p - arg_start);
22393 p = consume_improper_spaces (p, body);
22395 /* Consume the comma, if present. */
22400 p = consume_improper_spaces (p, body);
22409 /* Perfectly formed definition, no complaints. */
22410 macro_define_function (file, line, name,
22411 argc, (const char **) argv,
22413 else if (*p == '\0')
22415 /* Complain, but do define it. */
22416 dwarf2_macro_malformed_definition_complaint (body);
22417 macro_define_function (file, line, name,
22418 argc, (const char **) argv,
22422 /* Just complain. */
22423 dwarf2_macro_malformed_definition_complaint (body);
22426 /* Just complain. */
22427 dwarf2_macro_malformed_definition_complaint (body);
22433 for (i = 0; i < argc; i++)
22439 dwarf2_macro_malformed_definition_complaint (body);
22442 /* Skip some bytes from BYTES according to the form given in FORM.
22443 Returns the new pointer. */
22445 static const gdb_byte *
22446 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
22447 enum dwarf_form form,
22448 unsigned int offset_size,
22449 struct dwarf2_section_info *section)
22451 unsigned int bytes_read;
22455 case DW_FORM_data1:
22460 case DW_FORM_data2:
22464 case DW_FORM_data4:
22468 case DW_FORM_data8:
22472 case DW_FORM_data16:
22476 case DW_FORM_string:
22477 read_direct_string (abfd, bytes, &bytes_read);
22478 bytes += bytes_read;
22481 case DW_FORM_sec_offset:
22483 case DW_FORM_GNU_strp_alt:
22484 bytes += offset_size;
22487 case DW_FORM_block:
22488 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
22489 bytes += bytes_read;
22492 case DW_FORM_block1:
22493 bytes += 1 + read_1_byte (abfd, bytes);
22495 case DW_FORM_block2:
22496 bytes += 2 + read_2_bytes (abfd, bytes);
22498 case DW_FORM_block4:
22499 bytes += 4 + read_4_bytes (abfd, bytes);
22502 case DW_FORM_sdata:
22503 case DW_FORM_udata:
22504 case DW_FORM_GNU_addr_index:
22505 case DW_FORM_GNU_str_index:
22506 bytes = gdb_skip_leb128 (bytes, buffer_end);
22509 dwarf2_section_buffer_overflow_complaint (section);
22514 case DW_FORM_implicit_const:
22520 complaint (&symfile_complaints,
22521 _("invalid form 0x%x in `%s'"),
22522 form, get_section_name (section));
22530 /* A helper for dwarf_decode_macros that handles skipping an unknown
22531 opcode. Returns an updated pointer to the macro data buffer; or,
22532 on error, issues a complaint and returns NULL. */
22534 static const gdb_byte *
22535 skip_unknown_opcode (unsigned int opcode,
22536 const gdb_byte **opcode_definitions,
22537 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
22539 unsigned int offset_size,
22540 struct dwarf2_section_info *section)
22542 unsigned int bytes_read, i;
22544 const gdb_byte *defn;
22546 if (opcode_definitions[opcode] == NULL)
22548 complaint (&symfile_complaints,
22549 _("unrecognized DW_MACFINO opcode 0x%x"),
22554 defn = opcode_definitions[opcode];
22555 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
22556 defn += bytes_read;
22558 for (i = 0; i < arg; ++i)
22560 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
22561 (enum dwarf_form) defn[i], offset_size,
22563 if (mac_ptr == NULL)
22565 /* skip_form_bytes already issued the complaint. */
22573 /* A helper function which parses the header of a macro section.
22574 If the macro section is the extended (for now called "GNU") type,
22575 then this updates *OFFSET_SIZE. Returns a pointer to just after
22576 the header, or issues a complaint and returns NULL on error. */
22578 static const gdb_byte *
22579 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
22581 const gdb_byte *mac_ptr,
22582 unsigned int *offset_size,
22583 int section_is_gnu)
22585 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
22587 if (section_is_gnu)
22589 unsigned int version, flags;
22591 version = read_2_bytes (abfd, mac_ptr);
22592 if (version != 4 && version != 5)
22594 complaint (&symfile_complaints,
22595 _("unrecognized version `%d' in .debug_macro section"),
22601 flags = read_1_byte (abfd, mac_ptr);
22603 *offset_size = (flags & 1) ? 8 : 4;
22605 if ((flags & 2) != 0)
22606 /* We don't need the line table offset. */
22607 mac_ptr += *offset_size;
22609 /* Vendor opcode descriptions. */
22610 if ((flags & 4) != 0)
22612 unsigned int i, count;
22614 count = read_1_byte (abfd, mac_ptr);
22616 for (i = 0; i < count; ++i)
22618 unsigned int opcode, bytes_read;
22621 opcode = read_1_byte (abfd, mac_ptr);
22623 opcode_definitions[opcode] = mac_ptr;
22624 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22625 mac_ptr += bytes_read;
22634 /* A helper for dwarf_decode_macros that handles the GNU extensions,
22635 including DW_MACRO_import. */
22638 dwarf_decode_macro_bytes (bfd *abfd,
22639 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
22640 struct macro_source_file *current_file,
22641 struct line_header *lh,
22642 struct dwarf2_section_info *section,
22643 int section_is_gnu, int section_is_dwz,
22644 unsigned int offset_size,
22645 htab_t include_hash)
22647 struct objfile *objfile = dwarf2_per_objfile->objfile;
22648 enum dwarf_macro_record_type macinfo_type;
22649 int at_commandline;
22650 const gdb_byte *opcode_definitions[256];
22652 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
22653 &offset_size, section_is_gnu);
22654 if (mac_ptr == NULL)
22656 /* We already issued a complaint. */
22660 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
22661 GDB is still reading the definitions from command line. First
22662 DW_MACINFO_start_file will need to be ignored as it was already executed
22663 to create CURRENT_FILE for the main source holding also the command line
22664 definitions. On first met DW_MACINFO_start_file this flag is reset to
22665 normally execute all the remaining DW_MACINFO_start_file macinfos. */
22667 at_commandline = 1;
22671 /* Do we at least have room for a macinfo type byte? */
22672 if (mac_ptr >= mac_end)
22674 dwarf2_section_buffer_overflow_complaint (section);
22678 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
22681 /* Note that we rely on the fact that the corresponding GNU and
22682 DWARF constants are the same. */
22683 switch (macinfo_type)
22685 /* A zero macinfo type indicates the end of the macro
22690 case DW_MACRO_define:
22691 case DW_MACRO_undef:
22692 case DW_MACRO_define_strp:
22693 case DW_MACRO_undef_strp:
22694 case DW_MACRO_define_sup:
22695 case DW_MACRO_undef_sup:
22697 unsigned int bytes_read;
22702 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22703 mac_ptr += bytes_read;
22705 if (macinfo_type == DW_MACRO_define
22706 || macinfo_type == DW_MACRO_undef)
22708 body = read_direct_string (abfd, mac_ptr, &bytes_read);
22709 mac_ptr += bytes_read;
22713 LONGEST str_offset;
22715 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
22716 mac_ptr += offset_size;
22718 if (macinfo_type == DW_MACRO_define_sup
22719 || macinfo_type == DW_MACRO_undef_sup
22722 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22724 body = read_indirect_string_from_dwz (dwz, str_offset);
22727 body = read_indirect_string_at_offset (abfd, str_offset);
22730 is_define = (macinfo_type == DW_MACRO_define
22731 || macinfo_type == DW_MACRO_define_strp
22732 || macinfo_type == DW_MACRO_define_sup);
22733 if (! current_file)
22735 /* DWARF violation as no main source is present. */
22736 complaint (&symfile_complaints,
22737 _("debug info with no main source gives macro %s "
22739 is_define ? _("definition") : _("undefinition"),
22743 if ((line == 0 && !at_commandline)
22744 || (line != 0 && at_commandline))
22745 complaint (&symfile_complaints,
22746 _("debug info gives %s macro %s with %s line %d: %s"),
22747 at_commandline ? _("command-line") : _("in-file"),
22748 is_define ? _("definition") : _("undefinition"),
22749 line == 0 ? _("zero") : _("non-zero"), line, body);
22752 parse_macro_definition (current_file, line, body);
22755 gdb_assert (macinfo_type == DW_MACRO_undef
22756 || macinfo_type == DW_MACRO_undef_strp
22757 || macinfo_type == DW_MACRO_undef_sup);
22758 macro_undef (current_file, line, body);
22763 case DW_MACRO_start_file:
22765 unsigned int bytes_read;
22768 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22769 mac_ptr += bytes_read;
22770 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22771 mac_ptr += bytes_read;
22773 if ((line == 0 && !at_commandline)
22774 || (line != 0 && at_commandline))
22775 complaint (&symfile_complaints,
22776 _("debug info gives source %d included "
22777 "from %s at %s line %d"),
22778 file, at_commandline ? _("command-line") : _("file"),
22779 line == 0 ? _("zero") : _("non-zero"), line);
22781 if (at_commandline)
22783 /* This DW_MACRO_start_file was executed in the
22785 at_commandline = 0;
22788 current_file = macro_start_file (file, line, current_file, lh);
22792 case DW_MACRO_end_file:
22793 if (! current_file)
22794 complaint (&symfile_complaints,
22795 _("macro debug info has an unmatched "
22796 "`close_file' directive"));
22799 current_file = current_file->included_by;
22800 if (! current_file)
22802 enum dwarf_macro_record_type next_type;
22804 /* GCC circa March 2002 doesn't produce the zero
22805 type byte marking the end of the compilation
22806 unit. Complain if it's not there, but exit no
22809 /* Do we at least have room for a macinfo type byte? */
22810 if (mac_ptr >= mac_end)
22812 dwarf2_section_buffer_overflow_complaint (section);
22816 /* We don't increment mac_ptr here, so this is just
22819 = (enum dwarf_macro_record_type) read_1_byte (abfd,
22821 if (next_type != 0)
22822 complaint (&symfile_complaints,
22823 _("no terminating 0-type entry for "
22824 "macros in `.debug_macinfo' section"));
22831 case DW_MACRO_import:
22832 case DW_MACRO_import_sup:
22836 bfd *include_bfd = abfd;
22837 struct dwarf2_section_info *include_section = section;
22838 const gdb_byte *include_mac_end = mac_end;
22839 int is_dwz = section_is_dwz;
22840 const gdb_byte *new_mac_ptr;
22842 offset = read_offset_1 (abfd, mac_ptr, offset_size);
22843 mac_ptr += offset_size;
22845 if (macinfo_type == DW_MACRO_import_sup)
22847 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22849 dwarf2_read_section (objfile, &dwz->macro);
22851 include_section = &dwz->macro;
22852 include_bfd = get_section_bfd_owner (include_section);
22853 include_mac_end = dwz->macro.buffer + dwz->macro.size;
22857 new_mac_ptr = include_section->buffer + offset;
22858 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
22862 /* This has actually happened; see
22863 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
22864 complaint (&symfile_complaints,
22865 _("recursive DW_MACRO_import in "
22866 ".debug_macro section"));
22870 *slot = (void *) new_mac_ptr;
22872 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
22873 include_mac_end, current_file, lh,
22874 section, section_is_gnu, is_dwz,
22875 offset_size, include_hash);
22877 htab_remove_elt (include_hash, (void *) new_mac_ptr);
22882 case DW_MACINFO_vendor_ext:
22883 if (!section_is_gnu)
22885 unsigned int bytes_read;
22887 /* This reads the constant, but since we don't recognize
22888 any vendor extensions, we ignore it. */
22889 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22890 mac_ptr += bytes_read;
22891 read_direct_string (abfd, mac_ptr, &bytes_read);
22892 mac_ptr += bytes_read;
22894 /* We don't recognize any vendor extensions. */
22900 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
22901 mac_ptr, mac_end, abfd, offset_size,
22903 if (mac_ptr == NULL)
22907 } while (macinfo_type != 0);
22911 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
22912 int section_is_gnu)
22914 struct objfile *objfile = dwarf2_per_objfile->objfile;
22915 struct line_header *lh = cu->line_header;
22917 const gdb_byte *mac_ptr, *mac_end;
22918 struct macro_source_file *current_file = 0;
22919 enum dwarf_macro_record_type macinfo_type;
22920 unsigned int offset_size = cu->header.offset_size;
22921 const gdb_byte *opcode_definitions[256];
22923 struct dwarf2_section_info *section;
22924 const char *section_name;
22926 if (cu->dwo_unit != NULL)
22928 if (section_is_gnu)
22930 section = &cu->dwo_unit->dwo_file->sections.macro;
22931 section_name = ".debug_macro.dwo";
22935 section = &cu->dwo_unit->dwo_file->sections.macinfo;
22936 section_name = ".debug_macinfo.dwo";
22941 if (section_is_gnu)
22943 section = &dwarf2_per_objfile->macro;
22944 section_name = ".debug_macro";
22948 section = &dwarf2_per_objfile->macinfo;
22949 section_name = ".debug_macinfo";
22953 dwarf2_read_section (objfile, section);
22954 if (section->buffer == NULL)
22956 complaint (&symfile_complaints, _("missing %s section"), section_name);
22959 abfd = get_section_bfd_owner (section);
22961 /* First pass: Find the name of the base filename.
22962 This filename is needed in order to process all macros whose definition
22963 (or undefinition) comes from the command line. These macros are defined
22964 before the first DW_MACINFO_start_file entry, and yet still need to be
22965 associated to the base file.
22967 To determine the base file name, we scan the macro definitions until we
22968 reach the first DW_MACINFO_start_file entry. We then initialize
22969 CURRENT_FILE accordingly so that any macro definition found before the
22970 first DW_MACINFO_start_file can still be associated to the base file. */
22972 mac_ptr = section->buffer + offset;
22973 mac_end = section->buffer + section->size;
22975 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
22976 &offset_size, section_is_gnu);
22977 if (mac_ptr == NULL)
22979 /* We already issued a complaint. */
22985 /* Do we at least have room for a macinfo type byte? */
22986 if (mac_ptr >= mac_end)
22988 /* Complaint is printed during the second pass as GDB will probably
22989 stop the first pass earlier upon finding
22990 DW_MACINFO_start_file. */
22994 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
22997 /* Note that we rely on the fact that the corresponding GNU and
22998 DWARF constants are the same. */
22999 switch (macinfo_type)
23001 /* A zero macinfo type indicates the end of the macro
23006 case DW_MACRO_define:
23007 case DW_MACRO_undef:
23008 /* Only skip the data by MAC_PTR. */
23010 unsigned int bytes_read;
23012 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23013 mac_ptr += bytes_read;
23014 read_direct_string (abfd, mac_ptr, &bytes_read);
23015 mac_ptr += bytes_read;
23019 case DW_MACRO_start_file:
23021 unsigned int bytes_read;
23024 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23025 mac_ptr += bytes_read;
23026 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23027 mac_ptr += bytes_read;
23029 current_file = macro_start_file (file, line, current_file, lh);
23033 case DW_MACRO_end_file:
23034 /* No data to skip by MAC_PTR. */
23037 case DW_MACRO_define_strp:
23038 case DW_MACRO_undef_strp:
23039 case DW_MACRO_define_sup:
23040 case DW_MACRO_undef_sup:
23042 unsigned int bytes_read;
23044 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23045 mac_ptr += bytes_read;
23046 mac_ptr += offset_size;
23050 case DW_MACRO_import:
23051 case DW_MACRO_import_sup:
23052 /* Note that, according to the spec, a transparent include
23053 chain cannot call DW_MACRO_start_file. So, we can just
23054 skip this opcode. */
23055 mac_ptr += offset_size;
23058 case DW_MACINFO_vendor_ext:
23059 /* Only skip the data by MAC_PTR. */
23060 if (!section_is_gnu)
23062 unsigned int bytes_read;
23064 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23065 mac_ptr += bytes_read;
23066 read_direct_string (abfd, mac_ptr, &bytes_read);
23067 mac_ptr += bytes_read;
23072 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
23073 mac_ptr, mac_end, abfd, offset_size,
23075 if (mac_ptr == NULL)
23079 } while (macinfo_type != 0 && current_file == NULL);
23081 /* Second pass: Process all entries.
23083 Use the AT_COMMAND_LINE flag to determine whether we are still processing
23084 command-line macro definitions/undefinitions. This flag is unset when we
23085 reach the first DW_MACINFO_start_file entry. */
23087 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
23089 NULL, xcalloc, xfree));
23090 mac_ptr = section->buffer + offset;
23091 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
23092 *slot = (void *) mac_ptr;
23093 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
23094 current_file, lh, section,
23095 section_is_gnu, 0, offset_size,
23096 include_hash.get ());
23099 /* Check if the attribute's form is a DW_FORM_block*
23100 if so return true else false. */
23103 attr_form_is_block (const struct attribute *attr)
23105 return (attr == NULL ? 0 :
23106 attr->form == DW_FORM_block1
23107 || attr->form == DW_FORM_block2
23108 || attr->form == DW_FORM_block4
23109 || attr->form == DW_FORM_block
23110 || attr->form == DW_FORM_exprloc);
23113 /* Return non-zero if ATTR's value is a section offset --- classes
23114 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
23115 You may use DW_UNSND (attr) to retrieve such offsets.
23117 Section 7.5.4, "Attribute Encodings", explains that no attribute
23118 may have a value that belongs to more than one of these classes; it
23119 would be ambiguous if we did, because we use the same forms for all
23123 attr_form_is_section_offset (const struct attribute *attr)
23125 return (attr->form == DW_FORM_data4
23126 || attr->form == DW_FORM_data8
23127 || attr->form == DW_FORM_sec_offset);
23130 /* Return non-zero if ATTR's value falls in the 'constant' class, or
23131 zero otherwise. When this function returns true, you can apply
23132 dwarf2_get_attr_constant_value to it.
23134 However, note that for some attributes you must check
23135 attr_form_is_section_offset before using this test. DW_FORM_data4
23136 and DW_FORM_data8 are members of both the constant class, and of
23137 the classes that contain offsets into other debug sections
23138 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
23139 that, if an attribute's can be either a constant or one of the
23140 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
23141 taken as section offsets, not constants.
23143 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
23144 cannot handle that. */
23147 attr_form_is_constant (const struct attribute *attr)
23149 switch (attr->form)
23151 case DW_FORM_sdata:
23152 case DW_FORM_udata:
23153 case DW_FORM_data1:
23154 case DW_FORM_data2:
23155 case DW_FORM_data4:
23156 case DW_FORM_data8:
23157 case DW_FORM_implicit_const:
23165 /* DW_ADDR is always stored already as sect_offset; despite for the forms
23166 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
23169 attr_form_is_ref (const struct attribute *attr)
23171 switch (attr->form)
23173 case DW_FORM_ref_addr:
23178 case DW_FORM_ref_udata:
23179 case DW_FORM_GNU_ref_alt:
23186 /* Return the .debug_loc section to use for CU.
23187 For DWO files use .debug_loc.dwo. */
23189 static struct dwarf2_section_info *
23190 cu_debug_loc_section (struct dwarf2_cu *cu)
23194 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
23196 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
23198 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
23199 : &dwarf2_per_objfile->loc);
23202 /* A helper function that fills in a dwarf2_loclist_baton. */
23205 fill_in_loclist_baton (struct dwarf2_cu *cu,
23206 struct dwarf2_loclist_baton *baton,
23207 const struct attribute *attr)
23209 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
23211 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
23213 baton->per_cu = cu->per_cu;
23214 gdb_assert (baton->per_cu);
23215 /* We don't know how long the location list is, but make sure we
23216 don't run off the edge of the section. */
23217 baton->size = section->size - DW_UNSND (attr);
23218 baton->data = section->buffer + DW_UNSND (attr);
23219 baton->base_address = cu->base_address;
23220 baton->from_dwo = cu->dwo_unit != NULL;
23224 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
23225 struct dwarf2_cu *cu, int is_block)
23227 struct objfile *objfile = dwarf2_per_objfile->objfile;
23228 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
23230 if (attr_form_is_section_offset (attr)
23231 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
23232 the section. If so, fall through to the complaint in the
23234 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
23236 struct dwarf2_loclist_baton *baton;
23238 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
23240 fill_in_loclist_baton (cu, baton, attr);
23242 if (cu->base_known == 0)
23243 complaint (&symfile_complaints,
23244 _("Location list used without "
23245 "specifying the CU base address."));
23247 SYMBOL_ACLASS_INDEX (sym) = (is_block
23248 ? dwarf2_loclist_block_index
23249 : dwarf2_loclist_index);
23250 SYMBOL_LOCATION_BATON (sym) = baton;
23254 struct dwarf2_locexpr_baton *baton;
23256 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
23257 baton->per_cu = cu->per_cu;
23258 gdb_assert (baton->per_cu);
23260 if (attr_form_is_block (attr))
23262 /* Note that we're just copying the block's data pointer
23263 here, not the actual data. We're still pointing into the
23264 info_buffer for SYM's objfile; right now we never release
23265 that buffer, but when we do clean up properly this may
23267 baton->size = DW_BLOCK (attr)->size;
23268 baton->data = DW_BLOCK (attr)->data;
23272 dwarf2_invalid_attrib_class_complaint ("location description",
23273 SYMBOL_NATURAL_NAME (sym));
23277 SYMBOL_ACLASS_INDEX (sym) = (is_block
23278 ? dwarf2_locexpr_block_index
23279 : dwarf2_locexpr_index);
23280 SYMBOL_LOCATION_BATON (sym) = baton;
23284 /* Return the OBJFILE associated with the compilation unit CU. If CU
23285 came from a separate debuginfo file, then the master objfile is
23289 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
23291 struct objfile *objfile = per_cu->objfile;
23293 /* Return the master objfile, so that we can report and look up the
23294 correct file containing this variable. */
23295 if (objfile->separate_debug_objfile_backlink)
23296 objfile = objfile->separate_debug_objfile_backlink;
23301 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
23302 (CU_HEADERP is unused in such case) or prepare a temporary copy at
23303 CU_HEADERP first. */
23305 static const struct comp_unit_head *
23306 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
23307 struct dwarf2_per_cu_data *per_cu)
23309 const gdb_byte *info_ptr;
23312 return &per_cu->cu->header;
23314 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
23316 memset (cu_headerp, 0, sizeof (*cu_headerp));
23317 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
23318 rcuh_kind::COMPILE);
23323 /* Return the address size given in the compilation unit header for CU. */
23326 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
23328 struct comp_unit_head cu_header_local;
23329 const struct comp_unit_head *cu_headerp;
23331 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
23333 return cu_headerp->addr_size;
23336 /* Return the offset size given in the compilation unit header for CU. */
23339 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
23341 struct comp_unit_head cu_header_local;
23342 const struct comp_unit_head *cu_headerp;
23344 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
23346 return cu_headerp->offset_size;
23349 /* See its dwarf2loc.h declaration. */
23352 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
23354 struct comp_unit_head cu_header_local;
23355 const struct comp_unit_head *cu_headerp;
23357 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
23359 if (cu_headerp->version == 2)
23360 return cu_headerp->addr_size;
23362 return cu_headerp->offset_size;
23365 /* Return the text offset of the CU. The returned offset comes from
23366 this CU's objfile. If this objfile came from a separate debuginfo
23367 file, then the offset may be different from the corresponding
23368 offset in the parent objfile. */
23371 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
23373 struct objfile *objfile = per_cu->objfile;
23375 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
23378 /* Return DWARF version number of PER_CU. */
23381 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
23383 return per_cu->dwarf_version;
23386 /* Locate the .debug_info compilation unit from CU's objfile which contains
23387 the DIE at OFFSET. Raises an error on failure. */
23389 static struct dwarf2_per_cu_data *
23390 dwarf2_find_containing_comp_unit (sect_offset sect_off,
23391 unsigned int offset_in_dwz,
23392 struct objfile *objfile)
23394 struct dwarf2_per_cu_data *this_cu;
23396 const sect_offset *cu_off;
23399 high = dwarf2_per_objfile->n_comp_units - 1;
23402 struct dwarf2_per_cu_data *mid_cu;
23403 int mid = low + (high - low) / 2;
23405 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
23406 cu_off = &mid_cu->sect_off;
23407 if (mid_cu->is_dwz > offset_in_dwz
23408 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
23413 gdb_assert (low == high);
23414 this_cu = dwarf2_per_objfile->all_comp_units[low];
23415 cu_off = &this_cu->sect_off;
23416 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
23418 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
23419 error (_("Dwarf Error: could not find partial DIE containing "
23420 "offset 0x%x [in module %s]"),
23421 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
23423 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
23425 return dwarf2_per_objfile->all_comp_units[low-1];
23429 this_cu = dwarf2_per_objfile->all_comp_units[low];
23430 if (low == dwarf2_per_objfile->n_comp_units - 1
23431 && sect_off >= this_cu->sect_off + this_cu->length)
23432 error (_("invalid dwarf2 offset %u"), to_underlying (sect_off));
23433 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
23438 /* Initialize dwarf2_cu CU, owned by PER_CU. */
23441 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
23443 memset (cu, 0, sizeof (*cu));
23445 cu->per_cu = per_cu;
23446 cu->objfile = per_cu->objfile;
23447 obstack_init (&cu->comp_unit_obstack);
23450 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
23453 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
23454 enum language pretend_language)
23456 struct attribute *attr;
23458 /* Set the language we're debugging. */
23459 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
23461 set_cu_language (DW_UNSND (attr), cu);
23464 cu->language = pretend_language;
23465 cu->language_defn = language_def (cu->language);
23468 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
23471 /* Release one cached compilation unit, CU. We unlink it from the tree
23472 of compilation units, but we don't remove it from the read_in_chain;
23473 the caller is responsible for that.
23474 NOTE: DATA is a void * because this function is also used as a
23475 cleanup routine. */
23478 free_heap_comp_unit (void *data)
23480 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
23482 gdb_assert (cu->per_cu != NULL);
23483 cu->per_cu->cu = NULL;
23486 obstack_free (&cu->comp_unit_obstack, NULL);
23491 /* This cleanup function is passed the address of a dwarf2_cu on the stack
23492 when we're finished with it. We can't free the pointer itself, but be
23493 sure to unlink it from the cache. Also release any associated storage. */
23496 free_stack_comp_unit (void *data)
23498 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
23500 gdb_assert (cu->per_cu != NULL);
23501 cu->per_cu->cu = NULL;
23504 obstack_free (&cu->comp_unit_obstack, NULL);
23505 cu->partial_dies = NULL;
23508 /* Free all cached compilation units. */
23511 free_cached_comp_units (void *data)
23513 dwarf2_per_objfile->free_cached_comp_units ();
23516 /* Increase the age counter on each cached compilation unit, and free
23517 any that are too old. */
23520 age_cached_comp_units (void)
23522 struct dwarf2_per_cu_data *per_cu, **last_chain;
23524 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
23525 per_cu = dwarf2_per_objfile->read_in_chain;
23526 while (per_cu != NULL)
23528 per_cu->cu->last_used ++;
23529 if (per_cu->cu->last_used <= dwarf_max_cache_age)
23530 dwarf2_mark (per_cu->cu);
23531 per_cu = per_cu->cu->read_in_chain;
23534 per_cu = dwarf2_per_objfile->read_in_chain;
23535 last_chain = &dwarf2_per_objfile->read_in_chain;
23536 while (per_cu != NULL)
23538 struct dwarf2_per_cu_data *next_cu;
23540 next_cu = per_cu->cu->read_in_chain;
23542 if (!per_cu->cu->mark)
23544 free_heap_comp_unit (per_cu->cu);
23545 *last_chain = next_cu;
23548 last_chain = &per_cu->cu->read_in_chain;
23554 /* Remove a single compilation unit from the cache. */
23557 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
23559 struct dwarf2_per_cu_data *per_cu, **last_chain;
23561 per_cu = dwarf2_per_objfile->read_in_chain;
23562 last_chain = &dwarf2_per_objfile->read_in_chain;
23563 while (per_cu != NULL)
23565 struct dwarf2_per_cu_data *next_cu;
23567 next_cu = per_cu->cu->read_in_chain;
23569 if (per_cu == target_per_cu)
23571 free_heap_comp_unit (per_cu->cu);
23573 *last_chain = next_cu;
23577 last_chain = &per_cu->cu->read_in_chain;
23583 /* Release all extra memory associated with OBJFILE. */
23586 dwarf2_free_objfile (struct objfile *objfile)
23589 = (struct dwarf2_per_objfile *) objfile_data (objfile,
23590 dwarf2_objfile_data_key);
23592 if (dwarf2_per_objfile == NULL)
23595 dwarf2_per_objfile->~dwarf2_per_objfile ();
23598 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
23599 We store these in a hash table separate from the DIEs, and preserve them
23600 when the DIEs are flushed out of cache.
23602 The CU "per_cu" pointer is needed because offset alone is not enough to
23603 uniquely identify the type. A file may have multiple .debug_types sections,
23604 or the type may come from a DWO file. Furthermore, while it's more logical
23605 to use per_cu->section+offset, with Fission the section with the data is in
23606 the DWO file but we don't know that section at the point we need it.
23607 We have to use something in dwarf2_per_cu_data (or the pointer to it)
23608 because we can enter the lookup routine, get_die_type_at_offset, from
23609 outside this file, and thus won't necessarily have PER_CU->cu.
23610 Fortunately, PER_CU is stable for the life of the objfile. */
23612 struct dwarf2_per_cu_offset_and_type
23614 const struct dwarf2_per_cu_data *per_cu;
23615 sect_offset sect_off;
23619 /* Hash function for a dwarf2_per_cu_offset_and_type. */
23622 per_cu_offset_and_type_hash (const void *item)
23624 const struct dwarf2_per_cu_offset_and_type *ofs
23625 = (const struct dwarf2_per_cu_offset_and_type *) item;
23627 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
23630 /* Equality function for a dwarf2_per_cu_offset_and_type. */
23633 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
23635 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
23636 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
23637 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
23638 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
23640 return (ofs_lhs->per_cu == ofs_rhs->per_cu
23641 && ofs_lhs->sect_off == ofs_rhs->sect_off);
23644 /* Set the type associated with DIE to TYPE. Save it in CU's hash
23645 table if necessary. For convenience, return TYPE.
23647 The DIEs reading must have careful ordering to:
23648 * Not cause infite loops trying to read in DIEs as a prerequisite for
23649 reading current DIE.
23650 * Not trying to dereference contents of still incompletely read in types
23651 while reading in other DIEs.
23652 * Enable referencing still incompletely read in types just by a pointer to
23653 the type without accessing its fields.
23655 Therefore caller should follow these rules:
23656 * Try to fetch any prerequisite types we may need to build this DIE type
23657 before building the type and calling set_die_type.
23658 * After building type call set_die_type for current DIE as soon as
23659 possible before fetching more types to complete the current type.
23660 * Make the type as complete as possible before fetching more types. */
23662 static struct type *
23663 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
23665 struct dwarf2_per_cu_offset_and_type **slot, ofs;
23666 struct objfile *objfile = cu->objfile;
23667 struct attribute *attr;
23668 struct dynamic_prop prop;
23670 /* For Ada types, make sure that the gnat-specific data is always
23671 initialized (if not already set). There are a few types where
23672 we should not be doing so, because the type-specific area is
23673 already used to hold some other piece of info (eg: TYPE_CODE_FLT
23674 where the type-specific area is used to store the floatformat).
23675 But this is not a problem, because the gnat-specific information
23676 is actually not needed for these types. */
23677 if (need_gnat_info (cu)
23678 && TYPE_CODE (type) != TYPE_CODE_FUNC
23679 && TYPE_CODE (type) != TYPE_CODE_FLT
23680 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
23681 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
23682 && TYPE_CODE (type) != TYPE_CODE_METHOD
23683 && !HAVE_GNAT_AUX_INFO (type))
23684 INIT_GNAT_SPECIFIC (type);
23686 /* Read DW_AT_allocated and set in type. */
23687 attr = dwarf2_attr (die, DW_AT_allocated, cu);
23688 if (attr_form_is_block (attr))
23690 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23691 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type, objfile);
23693 else if (attr != NULL)
23695 complaint (&symfile_complaints,
23696 _("DW_AT_allocated has the wrong form (%s) at DIE 0x%x"),
23697 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23698 to_underlying (die->sect_off));
23701 /* Read DW_AT_associated and set in type. */
23702 attr = dwarf2_attr (die, DW_AT_associated, cu);
23703 if (attr_form_is_block (attr))
23705 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23706 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type, objfile);
23708 else if (attr != NULL)
23710 complaint (&symfile_complaints,
23711 _("DW_AT_associated has the wrong form (%s) at DIE 0x%x"),
23712 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23713 to_underlying (die->sect_off));
23716 /* Read DW_AT_data_location and set in type. */
23717 attr = dwarf2_attr (die, DW_AT_data_location, cu);
23718 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23719 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type, objfile);
23721 if (dwarf2_per_objfile->die_type_hash == NULL)
23723 dwarf2_per_objfile->die_type_hash =
23724 htab_create_alloc_ex (127,
23725 per_cu_offset_and_type_hash,
23726 per_cu_offset_and_type_eq,
23728 &objfile->objfile_obstack,
23729 hashtab_obstack_allocate,
23730 dummy_obstack_deallocate);
23733 ofs.per_cu = cu->per_cu;
23734 ofs.sect_off = die->sect_off;
23736 slot = (struct dwarf2_per_cu_offset_and_type **)
23737 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
23739 complaint (&symfile_complaints,
23740 _("A problem internal to GDB: DIE 0x%x has type already set"),
23741 to_underlying (die->sect_off));
23742 *slot = XOBNEW (&objfile->objfile_obstack,
23743 struct dwarf2_per_cu_offset_and_type);
23748 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
23749 or return NULL if the die does not have a saved type. */
23751 static struct type *
23752 get_die_type_at_offset (sect_offset sect_off,
23753 struct dwarf2_per_cu_data *per_cu)
23755 struct dwarf2_per_cu_offset_and_type *slot, ofs;
23757 if (dwarf2_per_objfile->die_type_hash == NULL)
23760 ofs.per_cu = per_cu;
23761 ofs.sect_off = sect_off;
23762 slot = ((struct dwarf2_per_cu_offset_and_type *)
23763 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
23770 /* Look up the type for DIE in CU in die_type_hash,
23771 or return NULL if DIE does not have a saved type. */
23773 static struct type *
23774 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
23776 return get_die_type_at_offset (die->sect_off, cu->per_cu);
23779 /* Add a dependence relationship from CU to REF_PER_CU. */
23782 dwarf2_add_dependence (struct dwarf2_cu *cu,
23783 struct dwarf2_per_cu_data *ref_per_cu)
23787 if (cu->dependencies == NULL)
23789 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
23790 NULL, &cu->comp_unit_obstack,
23791 hashtab_obstack_allocate,
23792 dummy_obstack_deallocate);
23794 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
23796 *slot = ref_per_cu;
23799 /* Subroutine of dwarf2_mark to pass to htab_traverse.
23800 Set the mark field in every compilation unit in the
23801 cache that we must keep because we are keeping CU. */
23804 dwarf2_mark_helper (void **slot, void *data)
23806 struct dwarf2_per_cu_data *per_cu;
23808 per_cu = (struct dwarf2_per_cu_data *) *slot;
23810 /* cu->dependencies references may not yet have been ever read if QUIT aborts
23811 reading of the chain. As such dependencies remain valid it is not much
23812 useful to track and undo them during QUIT cleanups. */
23813 if (per_cu->cu == NULL)
23816 if (per_cu->cu->mark)
23818 per_cu->cu->mark = 1;
23820 if (per_cu->cu->dependencies != NULL)
23821 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
23826 /* Set the mark field in CU and in every other compilation unit in the
23827 cache that we must keep because we are keeping CU. */
23830 dwarf2_mark (struct dwarf2_cu *cu)
23835 if (cu->dependencies != NULL)
23836 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
23840 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
23844 per_cu->cu->mark = 0;
23845 per_cu = per_cu->cu->read_in_chain;
23849 /* Trivial hash function for partial_die_info: the hash value of a DIE
23850 is its offset in .debug_info for this objfile. */
23853 partial_die_hash (const void *item)
23855 const struct partial_die_info *part_die
23856 = (const struct partial_die_info *) item;
23858 return to_underlying (part_die->sect_off);
23861 /* Trivial comparison function for partial_die_info structures: two DIEs
23862 are equal if they have the same offset. */
23865 partial_die_eq (const void *item_lhs, const void *item_rhs)
23867 const struct partial_die_info *part_die_lhs
23868 = (const struct partial_die_info *) item_lhs;
23869 const struct partial_die_info *part_die_rhs
23870 = (const struct partial_die_info *) item_rhs;
23872 return part_die_lhs->sect_off == part_die_rhs->sect_off;
23875 static struct cmd_list_element *set_dwarf_cmdlist;
23876 static struct cmd_list_element *show_dwarf_cmdlist;
23879 set_dwarf_cmd (const char *args, int from_tty)
23881 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
23886 show_dwarf_cmd (const char *args, int from_tty)
23888 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
23891 /* Free data associated with OBJFILE, if necessary. */
23894 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
23896 struct dwarf2_per_objfile *data = (struct dwarf2_per_objfile *) d;
23899 /* Make sure we don't accidentally use dwarf2_per_objfile while
23901 dwarf2_per_objfile = NULL;
23903 for (ix = 0; ix < data->n_comp_units; ++ix)
23904 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
23906 for (ix = 0; ix < data->n_type_units; ++ix)
23907 VEC_free (dwarf2_per_cu_ptr,
23908 data->all_type_units[ix]->per_cu.imported_symtabs);
23909 xfree (data->all_type_units);
23911 VEC_free (dwarf2_section_info_def, data->types);
23913 if (data->dwo_files)
23914 free_dwo_files (data->dwo_files, objfile);
23915 if (data->dwp_file)
23916 gdb_bfd_unref (data->dwp_file->dbfd);
23918 if (data->dwz_file && data->dwz_file->dwz_bfd)
23919 gdb_bfd_unref (data->dwz_file->dwz_bfd);
23921 if (data->index_table != NULL)
23922 data->index_table->~mapped_index ();
23926 /* The "save gdb-index" command. */
23928 /* In-memory buffer to prepare data to be written later to a file. */
23932 /* Copy DATA to the end of the buffer. */
23933 template<typename T>
23934 void append_data (const T &data)
23936 std::copy (reinterpret_cast<const gdb_byte *> (&data),
23937 reinterpret_cast<const gdb_byte *> (&data + 1),
23938 grow (sizeof (data)));
23941 /* Copy CSTR (a zero-terminated string) to the end of buffer. The
23942 terminating zero is appended too. */
23943 void append_cstr0 (const char *cstr)
23945 const size_t size = strlen (cstr) + 1;
23946 std::copy (cstr, cstr + size, grow (size));
23949 /* Accept a host-format integer in VAL and append it to the buffer
23950 as a target-format integer which is LEN bytes long. */
23951 void append_uint (size_t len, bfd_endian byte_order, ULONGEST val)
23953 ::store_unsigned_integer (grow (len), len, byte_order, val);
23956 /* Return the size of the buffer. */
23957 size_t size () const
23959 return m_vec.size ();
23962 /* Write the buffer to FILE. */
23963 void file_write (FILE *file) const
23965 if (::fwrite (m_vec.data (), 1, m_vec.size (), file) != m_vec.size ())
23966 error (_("couldn't write data to file"));
23970 /* Grow SIZE bytes at the end of the buffer. Returns a pointer to
23971 the start of the new block. */
23972 gdb_byte *grow (size_t size)
23974 m_vec.resize (m_vec.size () + size);
23975 return &*m_vec.end () - size;
23978 gdb::byte_vector m_vec;
23981 /* An entry in the symbol table. */
23982 struct symtab_index_entry
23984 /* The name of the symbol. */
23986 /* The offset of the name in the constant pool. */
23987 offset_type index_offset;
23988 /* A sorted vector of the indices of all the CUs that hold an object
23990 std::vector<offset_type> cu_indices;
23993 /* The symbol table. This is a power-of-2-sized hash table. */
23994 struct mapped_symtab
23998 data.resize (1024);
24001 offset_type n_elements = 0;
24002 std::vector<symtab_index_entry> data;
24005 /* Find a slot in SYMTAB for the symbol NAME. Returns a reference to
24008 Function is used only during write_hash_table so no index format backward
24009 compatibility is needed. */
24011 static symtab_index_entry &
24012 find_slot (struct mapped_symtab *symtab, const char *name)
24014 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
24016 index = hash & (symtab->data.size () - 1);
24017 step = ((hash * 17) & (symtab->data.size () - 1)) | 1;
24021 if (symtab->data[index].name == NULL
24022 || strcmp (name, symtab->data[index].name) == 0)
24023 return symtab->data[index];
24024 index = (index + step) & (symtab->data.size () - 1);
24028 /* Expand SYMTAB's hash table. */
24031 hash_expand (struct mapped_symtab *symtab)
24033 auto old_entries = std::move (symtab->data);
24035 symtab->data.clear ();
24036 symtab->data.resize (old_entries.size () * 2);
24038 for (auto &it : old_entries)
24039 if (it.name != NULL)
24041 auto &ref = find_slot (symtab, it.name);
24042 ref = std::move (it);
24046 /* Add an entry to SYMTAB. NAME is the name of the symbol.
24047 CU_INDEX is the index of the CU in which the symbol appears.
24048 IS_STATIC is one if the symbol is static, otherwise zero (global). */
24051 add_index_entry (struct mapped_symtab *symtab, const char *name,
24052 int is_static, gdb_index_symbol_kind kind,
24053 offset_type cu_index)
24055 offset_type cu_index_and_attrs;
24057 ++symtab->n_elements;
24058 if (4 * symtab->n_elements / 3 >= symtab->data.size ())
24059 hash_expand (symtab);
24061 symtab_index_entry &slot = find_slot (symtab, name);
24062 if (slot.name == NULL)
24065 /* index_offset is set later. */
24068 cu_index_and_attrs = 0;
24069 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
24070 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
24071 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
24073 /* We don't want to record an index value twice as we want to avoid the
24075 We process all global symbols and then all static symbols
24076 (which would allow us to avoid the duplication by only having to check
24077 the last entry pushed), but a symbol could have multiple kinds in one CU.
24078 To keep things simple we don't worry about the duplication here and
24079 sort and uniqufy the list after we've processed all symbols. */
24080 slot.cu_indices.push_back (cu_index_and_attrs);
24083 /* Sort and remove duplicates of all symbols' cu_indices lists. */
24086 uniquify_cu_indices (struct mapped_symtab *symtab)
24088 for (auto &entry : symtab->data)
24090 if (entry.name != NULL && !entry.cu_indices.empty ())
24092 auto &cu_indices = entry.cu_indices;
24093 std::sort (cu_indices.begin (), cu_indices.end ());
24094 auto from = std::unique (cu_indices.begin (), cu_indices.end ());
24095 cu_indices.erase (from, cu_indices.end ());
24100 /* A form of 'const char *' suitable for container keys. Only the
24101 pointer is stored. The strings themselves are compared, not the
24106 c_str_view (const char *cstr)
24110 bool operator== (const c_str_view &other) const
24112 return strcmp (m_cstr, other.m_cstr) == 0;
24116 friend class c_str_view_hasher;
24117 const char *const m_cstr;
24120 /* A std::unordered_map::hasher for c_str_view that uses the right
24121 hash function for strings in a mapped index. */
24122 class c_str_view_hasher
24125 size_t operator () (const c_str_view &x) const
24127 return mapped_index_string_hash (INT_MAX, x.m_cstr);
24131 /* A std::unordered_map::hasher for std::vector<>. */
24132 template<typename T>
24133 class vector_hasher
24136 size_t operator () (const std::vector<T> &key) const
24138 return iterative_hash (key.data (),
24139 sizeof (key.front ()) * key.size (), 0);
24143 /* Write the mapped hash table SYMTAB to the data buffer OUTPUT, with
24144 constant pool entries going into the data buffer CPOOL. */
24147 write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
24150 /* Elements are sorted vectors of the indices of all the CUs that
24151 hold an object of this name. */
24152 std::unordered_map<std::vector<offset_type>, offset_type,
24153 vector_hasher<offset_type>>
24156 /* We add all the index vectors to the constant pool first, to
24157 ensure alignment is ok. */
24158 for (symtab_index_entry &entry : symtab->data)
24160 if (entry.name == NULL)
24162 gdb_assert (entry.index_offset == 0);
24164 /* Finding before inserting is faster than always trying to
24165 insert, because inserting always allocates a node, does the
24166 lookup, and then destroys the new node if another node
24167 already had the same key. C++17 try_emplace will avoid
24170 = symbol_hash_table.find (entry.cu_indices);
24171 if (found != symbol_hash_table.end ())
24173 entry.index_offset = found->second;
24177 symbol_hash_table.emplace (entry.cu_indices, cpool.size ());
24178 entry.index_offset = cpool.size ();
24179 cpool.append_data (MAYBE_SWAP (entry.cu_indices.size ()));
24180 for (const auto index : entry.cu_indices)
24181 cpool.append_data (MAYBE_SWAP (index));
24185 /* Now write out the hash table. */
24186 std::unordered_map<c_str_view, offset_type, c_str_view_hasher> str_table;
24187 for (const auto &entry : symtab->data)
24189 offset_type str_off, vec_off;
24191 if (entry.name != NULL)
24193 const auto insertpair = str_table.emplace (entry.name, cpool.size ());
24194 if (insertpair.second)
24195 cpool.append_cstr0 (entry.name);
24196 str_off = insertpair.first->second;
24197 vec_off = entry.index_offset;
24201 /* While 0 is a valid constant pool index, it is not valid
24202 to have 0 for both offsets. */
24207 output.append_data (MAYBE_SWAP (str_off));
24208 output.append_data (MAYBE_SWAP (vec_off));
24212 typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
24214 /* Helper struct for building the address table. */
24215 struct addrmap_index_data
24217 addrmap_index_data (data_buf &addr_vec_, psym_index_map &cu_index_htab_)
24218 : addr_vec (addr_vec_), cu_index_htab (cu_index_htab_)
24221 struct objfile *objfile;
24222 data_buf &addr_vec;
24223 psym_index_map &cu_index_htab;
24225 /* Non-zero if the previous_* fields are valid.
24226 We can't write an entry until we see the next entry (since it is only then
24227 that we know the end of the entry). */
24228 int previous_valid;
24229 /* Index of the CU in the table of all CUs in the index file. */
24230 unsigned int previous_cu_index;
24231 /* Start address of the CU. */
24232 CORE_ADDR previous_cu_start;
24235 /* Write an address entry to ADDR_VEC. */
24238 add_address_entry (struct objfile *objfile, data_buf &addr_vec,
24239 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
24241 CORE_ADDR baseaddr;
24243 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
24245 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, start - baseaddr);
24246 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, end - baseaddr);
24247 addr_vec.append_data (MAYBE_SWAP (cu_index));
24250 /* Worker function for traversing an addrmap to build the address table. */
24253 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
24255 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
24256 struct partial_symtab *pst = (struct partial_symtab *) obj;
24258 if (data->previous_valid)
24259 add_address_entry (data->objfile, data->addr_vec,
24260 data->previous_cu_start, start_addr,
24261 data->previous_cu_index);
24263 data->previous_cu_start = start_addr;
24266 const auto it = data->cu_index_htab.find (pst);
24267 gdb_assert (it != data->cu_index_htab.cend ());
24268 data->previous_cu_index = it->second;
24269 data->previous_valid = 1;
24272 data->previous_valid = 0;
24277 /* Write OBJFILE's address map to ADDR_VEC.
24278 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
24279 in the index file. */
24282 write_address_map (struct objfile *objfile, data_buf &addr_vec,
24283 psym_index_map &cu_index_htab)
24285 struct addrmap_index_data addrmap_index_data (addr_vec, cu_index_htab);
24287 /* When writing the address table, we have to cope with the fact that
24288 the addrmap iterator only provides the start of a region; we have to
24289 wait until the next invocation to get the start of the next region. */
24291 addrmap_index_data.objfile = objfile;
24292 addrmap_index_data.previous_valid = 0;
24294 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
24295 &addrmap_index_data);
24297 /* It's highly unlikely the last entry (end address = 0xff...ff)
24298 is valid, but we should still handle it.
24299 The end address is recorded as the start of the next region, but that
24300 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
24302 if (addrmap_index_data.previous_valid)
24303 add_address_entry (objfile, addr_vec,
24304 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
24305 addrmap_index_data.previous_cu_index);
24308 /* Return the symbol kind of PSYM. */
24310 static gdb_index_symbol_kind
24311 symbol_kind (struct partial_symbol *psym)
24313 domain_enum domain = PSYMBOL_DOMAIN (psym);
24314 enum address_class aclass = PSYMBOL_CLASS (psym);
24322 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
24324 return GDB_INDEX_SYMBOL_KIND_TYPE;
24326 case LOC_CONST_BYTES:
24327 case LOC_OPTIMIZED_OUT:
24329 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
24331 /* Note: It's currently impossible to recognize psyms as enum values
24332 short of reading the type info. For now punt. */
24333 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
24335 /* There are other LOC_FOO values that one might want to classify
24336 as variables, but dwarf2read.c doesn't currently use them. */
24337 return GDB_INDEX_SYMBOL_KIND_OTHER;
24339 case STRUCT_DOMAIN:
24340 return GDB_INDEX_SYMBOL_KIND_TYPE;
24342 return GDB_INDEX_SYMBOL_KIND_OTHER;
24346 /* Add a list of partial symbols to SYMTAB. */
24349 write_psymbols (struct mapped_symtab *symtab,
24350 std::unordered_set<partial_symbol *> &psyms_seen,
24351 struct partial_symbol **psymp,
24353 offset_type cu_index,
24356 for (; count-- > 0; ++psymp)
24358 struct partial_symbol *psym = *psymp;
24360 if (SYMBOL_LANGUAGE (psym) == language_ada)
24361 error (_("Ada is not currently supported by the index"));
24363 /* Only add a given psymbol once. */
24364 if (psyms_seen.insert (psym).second)
24366 gdb_index_symbol_kind kind = symbol_kind (psym);
24368 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
24369 is_static, kind, cu_index);
24374 /* A helper struct used when iterating over debug_types. */
24375 struct signatured_type_index_data
24377 signatured_type_index_data (data_buf &types_list_,
24378 std::unordered_set<partial_symbol *> &psyms_seen_)
24379 : types_list (types_list_), psyms_seen (psyms_seen_)
24382 struct objfile *objfile;
24383 struct mapped_symtab *symtab;
24384 data_buf &types_list;
24385 std::unordered_set<partial_symbol *> &psyms_seen;
24389 /* A helper function that writes a single signatured_type to an
24393 write_one_signatured_type (void **slot, void *d)
24395 struct signatured_type_index_data *info
24396 = (struct signatured_type_index_data *) d;
24397 struct signatured_type *entry = (struct signatured_type *) *slot;
24398 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
24400 write_psymbols (info->symtab,
24402 &info->objfile->global_psymbols[psymtab->globals_offset],
24403 psymtab->n_global_syms, info->cu_index,
24405 write_psymbols (info->symtab,
24407 &info->objfile->static_psymbols[psymtab->statics_offset],
24408 psymtab->n_static_syms, info->cu_index,
24411 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
24412 to_underlying (entry->per_cu.sect_off));
24413 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
24414 to_underlying (entry->type_offset_in_tu));
24415 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE, entry->signature);
24422 /* Recurse into all "included" dependencies and count their symbols as
24423 if they appeared in this psymtab. */
24426 recursively_count_psymbols (struct partial_symtab *psymtab,
24427 size_t &psyms_seen)
24429 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
24430 if (psymtab->dependencies[i]->user != NULL)
24431 recursively_count_psymbols (psymtab->dependencies[i],
24434 psyms_seen += psymtab->n_global_syms;
24435 psyms_seen += psymtab->n_static_syms;
24438 /* Recurse into all "included" dependencies and write their symbols as
24439 if they appeared in this psymtab. */
24442 recursively_write_psymbols (struct objfile *objfile,
24443 struct partial_symtab *psymtab,
24444 struct mapped_symtab *symtab,
24445 std::unordered_set<partial_symbol *> &psyms_seen,
24446 offset_type cu_index)
24450 for (i = 0; i < psymtab->number_of_dependencies; ++i)
24451 if (psymtab->dependencies[i]->user != NULL)
24452 recursively_write_psymbols (objfile, psymtab->dependencies[i],
24453 symtab, psyms_seen, cu_index);
24455 write_psymbols (symtab,
24457 &objfile->global_psymbols[psymtab->globals_offset],
24458 psymtab->n_global_syms, cu_index,
24460 write_psymbols (symtab,
24462 &objfile->static_psymbols[psymtab->statics_offset],
24463 psymtab->n_static_syms, cu_index,
24467 /* Create an index file for OBJFILE in the directory DIR. */
24470 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
24472 if (dwarf2_per_objfile->using_index)
24473 error (_("Cannot use an index to create the index"));
24475 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
24476 error (_("Cannot make an index when the file has multiple .debug_types sections"));
24478 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
24482 if (stat (objfile_name (objfile), &st) < 0)
24483 perror_with_name (objfile_name (objfile));
24485 std::string filename (std::string (dir) + SLASH_STRING
24486 + lbasename (objfile_name (objfile)) + INDEX_SUFFIX);
24488 FILE *out_file = gdb_fopen_cloexec (filename.c_str (), "wb").release ();
24490 error (_("Can't open `%s' for writing"), filename.c_str ());
24492 /* Order matters here; we want FILE to be closed before FILENAME is
24493 unlinked, because on MS-Windows one cannot delete a file that is
24494 still open. (Don't call anything here that might throw until
24495 file_closer is created.) */
24496 gdb::unlinker unlink_file (filename.c_str ());
24497 gdb_file_up close_out_file (out_file);
24499 mapped_symtab symtab;
24502 /* While we're scanning CU's create a table that maps a psymtab pointer
24503 (which is what addrmap records) to its index (which is what is recorded
24504 in the index file). This will later be needed to write the address
24506 psym_index_map cu_index_htab;
24507 cu_index_htab.reserve (dwarf2_per_objfile->n_comp_units);
24509 /* The CU list is already sorted, so we don't need to do additional
24510 work here. Also, the debug_types entries do not appear in
24511 all_comp_units, but only in their own hash table. */
24513 /* The psyms_seen set is potentially going to be largish (~40k
24514 elements when indexing a -g3 build of GDB itself). Estimate the
24515 number of elements in order to avoid too many rehashes, which
24516 require rebuilding buckets and thus many trips to
24518 size_t psyms_count = 0;
24519 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
24521 struct dwarf2_per_cu_data *per_cu
24522 = dwarf2_per_objfile->all_comp_units[i];
24523 struct partial_symtab *psymtab = per_cu->v.psymtab;
24525 if (psymtab != NULL && psymtab->user == NULL)
24526 recursively_count_psymbols (psymtab, psyms_count);
24528 /* Generating an index for gdb itself shows a ratio of
24529 TOTAL_SEEN_SYMS/UNIQUE_SYMS or ~5. 4 seems like a good bet. */
24530 std::unordered_set<partial_symbol *> psyms_seen (psyms_count / 4);
24531 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
24533 struct dwarf2_per_cu_data *per_cu
24534 = dwarf2_per_objfile->all_comp_units[i];
24535 struct partial_symtab *psymtab = per_cu->v.psymtab;
24537 /* CU of a shared file from 'dwz -m' may be unused by this main file.
24538 It may be referenced from a local scope but in such case it does not
24539 need to be present in .gdb_index. */
24540 if (psymtab == NULL)
24543 if (psymtab->user == NULL)
24544 recursively_write_psymbols (objfile, psymtab, &symtab,
24547 const auto insertpair = cu_index_htab.emplace (psymtab, i);
24548 gdb_assert (insertpair.second);
24550 cu_list.append_uint (8, BFD_ENDIAN_LITTLE,
24551 to_underlying (per_cu->sect_off));
24552 cu_list.append_uint (8, BFD_ENDIAN_LITTLE, per_cu->length);
24555 /* Dump the address map. */
24557 write_address_map (objfile, addr_vec, cu_index_htab);
24559 /* Write out the .debug_type entries, if any. */
24560 data_buf types_cu_list;
24561 if (dwarf2_per_objfile->signatured_types)
24563 signatured_type_index_data sig_data (types_cu_list,
24566 sig_data.objfile = objfile;
24567 sig_data.symtab = &symtab;
24568 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
24569 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
24570 write_one_signatured_type, &sig_data);
24573 /* Now that we've processed all symbols we can shrink their cu_indices
24575 uniquify_cu_indices (&symtab);
24577 data_buf symtab_vec, constant_pool;
24578 write_hash_table (&symtab, symtab_vec, constant_pool);
24581 const offset_type size_of_contents = 6 * sizeof (offset_type);
24582 offset_type total_len = size_of_contents;
24584 /* The version number. */
24585 contents.append_data (MAYBE_SWAP (8));
24587 /* The offset of the CU list from the start of the file. */
24588 contents.append_data (MAYBE_SWAP (total_len));
24589 total_len += cu_list.size ();
24591 /* The offset of the types CU list from the start of the file. */
24592 contents.append_data (MAYBE_SWAP (total_len));
24593 total_len += types_cu_list.size ();
24595 /* The offset of the address table from the start of the file. */
24596 contents.append_data (MAYBE_SWAP (total_len));
24597 total_len += addr_vec.size ();
24599 /* The offset of the symbol table from the start of the file. */
24600 contents.append_data (MAYBE_SWAP (total_len));
24601 total_len += symtab_vec.size ();
24603 /* The offset of the constant pool from the start of the file. */
24604 contents.append_data (MAYBE_SWAP (total_len));
24605 total_len += constant_pool.size ();
24607 gdb_assert (contents.size () == size_of_contents);
24609 contents.file_write (out_file);
24610 cu_list.file_write (out_file);
24611 types_cu_list.file_write (out_file);
24612 addr_vec.file_write (out_file);
24613 symtab_vec.file_write (out_file);
24614 constant_pool.file_write (out_file);
24616 /* We want to keep the file. */
24617 unlink_file.keep ();
24620 /* Implementation of the `save gdb-index' command.
24622 Note that the file format used by this command is documented in the
24623 GDB manual. Any changes here must be documented there. */
24626 save_gdb_index_command (const char *arg, int from_tty)
24628 struct objfile *objfile;
24631 error (_("usage: save gdb-index DIRECTORY"));
24633 ALL_OBJFILES (objfile)
24637 /* If the objfile does not correspond to an actual file, skip it. */
24638 if (stat (objfile_name (objfile), &st) < 0)
24642 = (struct dwarf2_per_objfile *) objfile_data (objfile,
24643 dwarf2_objfile_data_key);
24644 if (dwarf2_per_objfile)
24649 write_psymtabs_to_index (objfile, arg);
24651 CATCH (except, RETURN_MASK_ERROR)
24653 exception_fprintf (gdb_stderr, except,
24654 _("Error while writing index for `%s': "),
24655 objfile_name (objfile));
24664 int dwarf_always_disassemble;
24667 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
24668 struct cmd_list_element *c, const char *value)
24670 fprintf_filtered (file,
24671 _("Whether to always disassemble "
24672 "DWARF expressions is %s.\n"),
24677 show_check_physname (struct ui_file *file, int from_tty,
24678 struct cmd_list_element *c, const char *value)
24680 fprintf_filtered (file,
24681 _("Whether to check \"physname\" is %s.\n"),
24686 _initialize_dwarf2_read (void)
24688 struct cmd_list_element *c;
24690 dwarf2_objfile_data_key
24691 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
24693 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
24694 Set DWARF specific variables.\n\
24695 Configure DWARF variables such as the cache size"),
24696 &set_dwarf_cmdlist, "maintenance set dwarf ",
24697 0/*allow-unknown*/, &maintenance_set_cmdlist);
24699 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
24700 Show DWARF specific variables\n\
24701 Show DWARF variables such as the cache size"),
24702 &show_dwarf_cmdlist, "maintenance show dwarf ",
24703 0/*allow-unknown*/, &maintenance_show_cmdlist);
24705 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
24706 &dwarf_max_cache_age, _("\
24707 Set the upper bound on the age of cached DWARF compilation units."), _("\
24708 Show the upper bound on the age of cached DWARF compilation units."), _("\
24709 A higher limit means that cached compilation units will be stored\n\
24710 in memory longer, and more total memory will be used. Zero disables\n\
24711 caching, which can slow down startup."),
24713 show_dwarf_max_cache_age,
24714 &set_dwarf_cmdlist,
24715 &show_dwarf_cmdlist);
24717 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
24718 &dwarf_always_disassemble, _("\
24719 Set whether `info address' always disassembles DWARF expressions."), _("\
24720 Show whether `info address' always disassembles DWARF expressions."), _("\
24721 When enabled, DWARF expressions are always printed in an assembly-like\n\
24722 syntax. When disabled, expressions will be printed in a more\n\
24723 conversational style, when possible."),
24725 show_dwarf_always_disassemble,
24726 &set_dwarf_cmdlist,
24727 &show_dwarf_cmdlist);
24729 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
24730 Set debugging of the DWARF reader."), _("\
24731 Show debugging of the DWARF reader."), _("\
24732 When enabled (non-zero), debugging messages are printed during DWARF\n\
24733 reading and symtab expansion. A value of 1 (one) provides basic\n\
24734 information. A value greater than 1 provides more verbose information."),
24737 &setdebuglist, &showdebuglist);
24739 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
24740 Set debugging of the DWARF DIE reader."), _("\
24741 Show debugging of the DWARF DIE reader."), _("\
24742 When enabled (non-zero), DIEs are dumped after they are read in.\n\
24743 The value is the maximum depth to print."),
24746 &setdebuglist, &showdebuglist);
24748 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
24749 Set debugging of the dwarf line reader."), _("\
24750 Show debugging of the dwarf line reader."), _("\
24751 When enabled (non-zero), line number entries are dumped as they are read in.\n\
24752 A value of 1 (one) provides basic information.\n\
24753 A value greater than 1 provides more verbose information."),
24756 &setdebuglist, &showdebuglist);
24758 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
24759 Set cross-checking of \"physname\" code against demangler."), _("\
24760 Show cross-checking of \"physname\" code against demangler."), _("\
24761 When enabled, GDB's internal \"physname\" code is checked against\n\
24763 NULL, show_check_physname,
24764 &setdebuglist, &showdebuglist);
24766 add_setshow_boolean_cmd ("use-deprecated-index-sections",
24767 no_class, &use_deprecated_index_sections, _("\
24768 Set whether to use deprecated gdb_index sections."), _("\
24769 Show whether to use deprecated gdb_index sections."), _("\
24770 When enabled, deprecated .gdb_index sections are used anyway.\n\
24771 Normally they are ignored either because of a missing feature or\n\
24772 performance issue.\n\
24773 Warning: This option must be enabled before gdb reads the file."),
24776 &setlist, &showlist);
24778 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
24780 Save a gdb-index file.\n\
24781 Usage: save gdb-index DIRECTORY"),
24783 set_cmd_completer (c, filename_completer);
24785 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
24786 &dwarf2_locexpr_funcs);
24787 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
24788 &dwarf2_loclist_funcs);
24790 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
24791 &dwarf2_block_frame_base_locexpr_funcs);
24792 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
24793 &dwarf2_block_frame_base_loclist_funcs);
24796 selftests::register_test ("dw2_expand_symtabs_matching",
24797 selftests::dw2_expand_symtabs_matching::run_test);