1 /* Support routines for building symbol tables in GDB's internal format.
2 Copyright (C) 1986-2018 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* This module provides subroutines used for creating and adding to
20 the symbol table. These routines are called from various symbol-
21 file-reading routines.
23 Routines to support specific debugging information formats (stabs,
24 DWARF, etc) belong somewhere else.
26 The basic way this module is used is as follows:
29 scoped_free_pendings free_pending;
30 cust = start_symtab (...);
31 ... read debug info ...
32 cust = end_symtab (...);
34 The compunit symtab pointer ("cust") is returned from both start_symtab
35 and end_symtab to simplify the debug info readers.
37 There are minor variations on this, e.g., dwarf2read.c splits end_symtab
38 into two calls: end_symtab_get_static_block, end_symtab_from_static_block,
39 but all debug info readers follow this basic flow.
41 Reading DWARF Type Units is another variation:
44 scoped_free_pendings free_pending;
45 cust = start_symtab (...);
46 ... read debug info ...
47 cust = end_expandable_symtab (...);
49 And then reading subsequent Type Units within the containing "Comp Unit"
50 will use a second flow:
53 scoped_free_pendings free_pending;
54 cust = restart_symtab (...);
55 ... read debug info ...
56 cust = augment_type_symtab (...);
58 dbxread.c and xcoffread.c use another variation:
61 scoped_free_pendings free_pending;
62 cust = start_symtab (...);
63 ... read debug info ...
64 cust = end_symtab (...);
65 ... start_symtab + read + end_symtab repeated ...
70 #include "gdb_obstack.h"
75 #include "complaints.h"
76 #include "expression.h" /* For "enum exp_opcode" used by... */
78 #include "filenames.h" /* For DOSish file names. */
80 #include "demangle.h" /* Needed by SYMBOL_INIT_DEMANGLED_NAME. */
82 #include "cp-support.h"
83 #include "dictionary.h"
87 /* Ask buildsym.h to define the vars it normally declares `extern'. */
90 #include "buildsym.h" /* Our own declarations. */
93 /* For cleanup_undefined_stabs_types and finish_global_stabs (somewhat
94 questionable--see comment where we call them). */
96 #include "stabsread.h"
98 /* Buildsym's counterpart to struct compunit_symtab.
99 TODO(dje): Move all related global state into here. */
101 struct buildsym_compunit
103 /* Start recording information about a primary source file (IOW, not an
104 included source file).
105 COMP_DIR is the directory in which the compilation unit was compiled
106 (or NULL if not known). */
108 buildsym_compunit (struct objfile *objfile_, const char *name,
109 const char *comp_dir_, enum language language_)
110 : objfile (objfile_),
111 m_last_source_file (name == nullptr ? nullptr : xstrdup (name)),
112 comp_dir (comp_dir_ == nullptr ? nullptr : xstrdup (comp_dir_)),
117 ~buildsym_compunit ()
119 struct subfile *subfile, *nextsub;
121 for (subfile = subfiles;
125 nextsub = subfile->next;
126 xfree (subfile->name);
127 xfree (subfile->line_vector);
132 void set_last_source_file (const char *name)
134 char *new_name = name == NULL ? NULL : xstrdup (name);
135 m_last_source_file.reset (new_name);
138 /* The objfile we're reading debug info from. */
139 struct objfile *objfile;
141 /* List of subfiles (source files).
142 Files are added to the front of the list.
143 This is important mostly for the language determination hacks we use,
144 which iterate over previously added files. */
145 struct subfile *subfiles = nullptr;
147 /* The subfile of the main source file. */
148 struct subfile *main_subfile = nullptr;
150 /* Name of source file whose symbol data we are now processing. This
151 comes from a symbol of type N_SO for stabs. For DWARF it comes
152 from the DW_AT_name attribute of a DW_TAG_compile_unit DIE. */
153 gdb::unique_xmalloc_ptr<char> m_last_source_file;
155 /* E.g., DW_AT_comp_dir if DWARF. Space for this is malloc'd. */
156 gdb::unique_xmalloc_ptr<char> comp_dir;
158 /* Space for this is not malloc'd, and is assumed to have at least
159 the same lifetime as objfile. */
160 const char *producer = nullptr;
162 /* Space for this is not malloc'd, and is assumed to have at least
163 the same lifetime as objfile. */
164 const char *debugformat = nullptr;
166 /* The compunit we are building. */
167 struct compunit_symtab *compunit_symtab = nullptr;
169 /* Language of this compunit_symtab. */
170 enum language language;
173 /* The work-in-progress of the compunit we are building.
174 This is created first, before any subfiles by start_symtab. */
176 static struct buildsym_compunit *buildsym_compunit;
178 /* List of free `struct pending' structures for reuse. */
180 static struct pending *free_pendings;
182 /* Non-zero if symtab has line number info. This prevents an
183 otherwise empty symtab from being tossed. */
185 static int have_line_numbers;
187 /* The mutable address map for the compilation unit whose symbols
188 we're currently reading. The symtabs' shared blockvector will
189 point to a fixed copy of this. */
190 static struct addrmap *pending_addrmap;
192 /* The obstack on which we allocate pending_addrmap.
193 If pending_addrmap is NULL, this is uninitialized; otherwise, it is
194 initialized (and holds pending_addrmap). */
195 static struct obstack pending_addrmap_obstack;
197 /* Non-zero if we recorded any ranges in the addrmap that are
198 different from those in the blockvector already. We set this to
199 zero when we start processing a symfile, and if it's still zero at
200 the end, then we just toss the addrmap. */
201 static int pending_addrmap_interesting;
203 /* An obstack used for allocating pending blocks. */
205 static struct obstack pending_block_obstack;
207 /* List of blocks already made (lexical contexts already closed).
208 This is used at the end to make the blockvector. */
212 struct pending_block *next;
216 /* Pointer to the head of a linked list of symbol blocks which have
217 already been finalized (lexical contexts already closed) and which
218 are just waiting to be built into a blockvector when finalizing the
219 associated symtab. */
221 static struct pending_block *pending_blocks;
225 struct subfile_stack *next;
229 static struct subfile_stack *subfile_stack;
231 /* The macro table for the compilation unit whose symbols we're
232 currently reading. */
233 static struct macro_table *pending_macros;
235 static void free_buildsym_compunit (void);
237 static int compare_line_numbers (const void *ln1p, const void *ln2p);
239 static void record_pending_block (struct objfile *objfile,
241 struct pending_block *opblock);
243 /* Initial sizes of data structures. These are realloc'd larger if
244 needed, and realloc'd down to the size actually used, when
247 #define INITIAL_CONTEXT_STACK_SIZE 10
248 #define INITIAL_LINE_VECTOR_LENGTH 1000
251 /* Maintain the lists of symbols and blocks. */
253 /* Add a symbol to one of the lists of symbols. */
256 add_symbol_to_list (struct symbol *symbol, struct pending **listhead)
258 struct pending *link;
260 /* If this is an alias for another symbol, don't add it. */
261 if (symbol->ginfo.name && symbol->ginfo.name[0] == '#')
264 /* We keep PENDINGSIZE symbols in each link of the list. If we
265 don't have a link with room in it, add a new link. */
266 if (*listhead == NULL || (*listhead)->nsyms == PENDINGSIZE)
270 link = free_pendings;
271 free_pendings = link->next;
275 link = XNEW (struct pending);
278 link->next = *listhead;
283 (*listhead)->symbol[(*listhead)->nsyms++] = symbol;
286 /* Find a symbol named NAME on a LIST. NAME need not be
287 '\0'-terminated; LENGTH is the length of the name. */
290 find_symbol_in_list (struct pending *list, char *name, int length)
297 for (j = list->nsyms; --j >= 0;)
299 pp = SYMBOL_LINKAGE_NAME (list->symbol[j]);
300 if (*pp == *name && strncmp (pp, name, length) == 0
301 && pp[length] == '\0')
303 return (list->symbol[j]);
311 /* At end of reading syms, or in case of quit, ensure everything
312 associated with building symtabs is freed.
314 N.B. This is *not* intended to be used when building psymtabs. Some debug
315 info readers call this anyway, which is harmless if confusing. */
317 scoped_free_pendings::~scoped_free_pendings ()
319 struct pending *next, *next1;
321 for (next = free_pendings; next; next = next1)
324 xfree ((void *) next);
326 free_pendings = NULL;
328 free_pending_blocks ();
330 for (next = file_symbols; next != NULL; next = next1)
333 xfree ((void *) next);
337 for (next = global_symbols; next != NULL; next = next1)
340 xfree ((void *) next);
342 global_symbols = NULL;
345 free_macro_table (pending_macros);
346 pending_macros = NULL;
349 obstack_free (&pending_addrmap_obstack, NULL);
350 pending_addrmap = NULL;
352 free_buildsym_compunit ();
355 /* This function is called to discard any pending blocks. */
358 free_pending_blocks (void)
360 if (pending_blocks != NULL)
362 obstack_free (&pending_block_obstack, NULL);
363 pending_blocks = NULL;
367 /* Take one of the lists of symbols and make a block from it. Keep
368 the order the symbols have in the list (reversed from the input
369 file). Put the block on the list of pending blocks. */
371 static struct block *
372 finish_block_internal (struct symbol *symbol,
373 struct pending **listhead,
374 struct pending_block *old_blocks,
375 const struct dynamic_prop *static_link,
376 CORE_ADDR start, CORE_ADDR end,
377 int is_global, int expandable)
379 struct objfile *objfile = buildsym_compunit->objfile;
380 struct gdbarch *gdbarch = get_objfile_arch (objfile);
381 struct pending *next, *next1;
383 struct pending_block *pblock;
384 struct pending_block *opblock;
387 ? allocate_global_block (&objfile->objfile_obstack)
388 : allocate_block (&objfile->objfile_obstack));
393 = dict_create_linear (&objfile->objfile_obstack,
394 buildsym_compunit->language, *listhead);
401 = dict_create_hashed_expandable (buildsym_compunit->language);
402 dict_add_pending (BLOCK_DICT (block), *listhead);
407 dict_create_hashed (&objfile->objfile_obstack,
408 buildsym_compunit->language, *listhead);
412 BLOCK_START (block) = start;
413 BLOCK_END (block) = end;
415 /* Put the block in as the value of the symbol that names it. */
419 struct type *ftype = SYMBOL_TYPE (symbol);
420 struct dict_iterator iter;
421 SYMBOL_BLOCK_VALUE (symbol) = block;
422 BLOCK_FUNCTION (block) = symbol;
424 if (TYPE_NFIELDS (ftype) <= 0)
426 /* No parameter type information is recorded with the
427 function's type. Set that from the type of the
428 parameter symbols. */
429 int nparams = 0, iparams;
432 /* Here we want to directly access the dictionary, because
433 we haven't fully initialized the block yet. */
434 ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
436 if (SYMBOL_IS_ARGUMENT (sym))
441 TYPE_NFIELDS (ftype) = nparams;
442 TYPE_FIELDS (ftype) = (struct field *)
443 TYPE_ALLOC (ftype, nparams * sizeof (struct field));
446 /* Here we want to directly access the dictionary, because
447 we haven't fully initialized the block yet. */
448 ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
450 if (iparams == nparams)
453 if (SYMBOL_IS_ARGUMENT (sym))
455 TYPE_FIELD_TYPE (ftype, iparams) = SYMBOL_TYPE (sym);
456 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
465 BLOCK_FUNCTION (block) = NULL;
468 if (static_link != NULL)
469 objfile_register_static_link (objfile, block, static_link);
471 /* Now "free" the links of the list, and empty the list. */
473 for (next = *listhead; next; next = next1)
476 next->next = free_pendings;
477 free_pendings = next;
481 /* Check to be sure that the blocks have an end address that is
482 greater than starting address. */
484 if (BLOCK_END (block) < BLOCK_START (block))
488 complaint (_("block end address less than block "
489 "start address in %s (patched it)"),
490 SYMBOL_PRINT_NAME (symbol));
494 complaint (_("block end address %s less than block "
495 "start address %s (patched it)"),
496 paddress (gdbarch, BLOCK_END (block)),
497 paddress (gdbarch, BLOCK_START (block)));
499 /* Better than nothing. */
500 BLOCK_END (block) = BLOCK_START (block);
503 /* Install this block as the superblock of all blocks made since the
504 start of this scope that don't have superblocks yet. */
507 for (pblock = pending_blocks;
508 pblock && pblock != old_blocks;
509 pblock = pblock->next)
511 if (BLOCK_SUPERBLOCK (pblock->block) == NULL)
513 /* Check to be sure the blocks are nested as we receive
514 them. If the compiler/assembler/linker work, this just
515 burns a small amount of time.
517 Skip blocks which correspond to a function; they're not
518 physically nested inside this other blocks, only
520 if (BLOCK_FUNCTION (pblock->block) == NULL
521 && (BLOCK_START (pblock->block) < BLOCK_START (block)
522 || BLOCK_END (pblock->block) > BLOCK_END (block)))
526 complaint (_("inner block not inside outer block in %s"),
527 SYMBOL_PRINT_NAME (symbol));
531 complaint (_("inner block (%s-%s) not "
532 "inside outer block (%s-%s)"),
533 paddress (gdbarch, BLOCK_START (pblock->block)),
534 paddress (gdbarch, BLOCK_END (pblock->block)),
535 paddress (gdbarch, BLOCK_START (block)),
536 paddress (gdbarch, BLOCK_END (block)));
538 if (BLOCK_START (pblock->block) < BLOCK_START (block))
539 BLOCK_START (pblock->block) = BLOCK_START (block);
540 if (BLOCK_END (pblock->block) > BLOCK_END (block))
541 BLOCK_END (pblock->block) = BLOCK_END (block);
543 BLOCK_SUPERBLOCK (pblock->block) = block;
548 block_set_using (block,
550 ? global_using_directives
551 : local_using_directives),
552 &objfile->objfile_obstack);
554 global_using_directives = NULL;
556 local_using_directives = NULL;
558 record_pending_block (objfile, block, opblock);
564 finish_block (struct symbol *symbol,
565 struct pending **listhead,
566 struct pending_block *old_blocks,
567 const struct dynamic_prop *static_link,
568 CORE_ADDR start, CORE_ADDR end)
570 return finish_block_internal (symbol, listhead, old_blocks, static_link,
574 /* Record BLOCK on the list of all blocks in the file. Put it after
575 OPBLOCK, or at the beginning if opblock is NULL. This puts the
576 block in the list after all its subblocks.
578 Allocate the pending block struct in the objfile_obstack to save
579 time. This wastes a little space. FIXME: Is it worth it? */
582 record_pending_block (struct objfile *objfile, struct block *block,
583 struct pending_block *opblock)
585 struct pending_block *pblock;
587 if (pending_blocks == NULL)
588 obstack_init (&pending_block_obstack);
590 pblock = XOBNEW (&pending_block_obstack, struct pending_block);
591 pblock->block = block;
594 pblock->next = opblock->next;
595 opblock->next = pblock;
599 pblock->next = pending_blocks;
600 pending_blocks = pblock;
605 /* Record that the range of addresses from START to END_INCLUSIVE
606 (inclusive, like it says) belongs to BLOCK. BLOCK's start and end
607 addresses must be set already. You must apply this function to all
608 BLOCK's children before applying it to BLOCK.
610 If a call to this function complicates the picture beyond that
611 already provided by BLOCK_START and BLOCK_END, then we create an
612 address map for the block. */
614 record_block_range (struct block *block,
615 CORE_ADDR start, CORE_ADDR end_inclusive)
617 /* If this is any different from the range recorded in the block's
618 own BLOCK_START and BLOCK_END, then note that the address map has
619 become interesting. Note that even if this block doesn't have
620 any "interesting" ranges, some later block might, so we still
621 need to record this block in the addrmap. */
622 if (start != BLOCK_START (block)
623 || end_inclusive + 1 != BLOCK_END (block))
624 pending_addrmap_interesting = 1;
626 if (! pending_addrmap)
628 obstack_init (&pending_addrmap_obstack);
629 pending_addrmap = addrmap_create_mutable (&pending_addrmap_obstack);
632 addrmap_set_empty (pending_addrmap, start, end_inclusive, block);
635 static struct blockvector *
636 make_blockvector (void)
638 struct objfile *objfile = buildsym_compunit->objfile;
639 struct pending_block *next;
640 struct blockvector *blockvector;
643 /* Count the length of the list of blocks. */
645 for (next = pending_blocks, i = 0; next; next = next->next, i++)
649 blockvector = (struct blockvector *)
650 obstack_alloc (&objfile->objfile_obstack,
651 (sizeof (struct blockvector)
652 + (i - 1) * sizeof (struct block *)));
654 /* Copy the blocks into the blockvector. This is done in reverse
655 order, which happens to put the blocks into the proper order
656 (ascending starting address). finish_block has hair to insert
657 each block into the list after its subblocks in order to make
658 sure this is true. */
660 BLOCKVECTOR_NBLOCKS (blockvector) = i;
661 for (next = pending_blocks; next; next = next->next)
663 BLOCKVECTOR_BLOCK (blockvector, --i) = next->block;
666 free_pending_blocks ();
668 /* If we needed an address map for this symtab, record it in the
670 if (pending_addrmap && pending_addrmap_interesting)
671 BLOCKVECTOR_MAP (blockvector)
672 = addrmap_create_fixed (pending_addrmap, &objfile->objfile_obstack);
674 BLOCKVECTOR_MAP (blockvector) = 0;
676 /* Some compilers output blocks in the wrong order, but we depend on
677 their being in the right order so we can binary search. Check the
678 order and moan about it.
679 Note: Remember that the first two blocks are the global and static
680 blocks. We could special case that fact and begin checking at block 2.
681 To avoid making that assumption we do not. */
682 if (BLOCKVECTOR_NBLOCKS (blockvector) > 1)
684 for (i = 1; i < BLOCKVECTOR_NBLOCKS (blockvector); i++)
686 if (BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i - 1))
687 > BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i)))
690 = BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i));
692 complaint (_("block at %s out of order"),
693 hex_string ((LONGEST) start));
698 return (blockvector);
701 /* Start recording information about source code that came from an
702 included (or otherwise merged-in) source file with a different
703 name. NAME is the name of the file (cannot be NULL). */
706 start_subfile (const char *name)
708 const char *subfile_dirname;
709 struct subfile *subfile;
711 gdb_assert (buildsym_compunit != NULL);
713 subfile_dirname = buildsym_compunit->comp_dir.get ();
715 /* See if this subfile is already registered. */
717 for (subfile = buildsym_compunit->subfiles; subfile; subfile = subfile->next)
721 /* If NAME is an absolute path, and this subfile is not, then
722 attempt to create an absolute path to compare. */
723 if (IS_ABSOLUTE_PATH (name)
724 && !IS_ABSOLUTE_PATH (subfile->name)
725 && subfile_dirname != NULL)
726 subfile_name = concat (subfile_dirname, SLASH_STRING,
727 subfile->name, (char *) NULL);
729 subfile_name = subfile->name;
731 if (FILENAME_CMP (subfile_name, name) == 0)
733 current_subfile = subfile;
734 if (subfile_name != subfile->name)
735 xfree (subfile_name);
738 if (subfile_name != subfile->name)
739 xfree (subfile_name);
742 /* This subfile is not known. Add an entry for it. */
744 subfile = XNEW (struct subfile);
745 memset (subfile, 0, sizeof (struct subfile));
746 subfile->buildsym_compunit = buildsym_compunit;
748 subfile->next = buildsym_compunit->subfiles;
749 buildsym_compunit->subfiles = subfile;
751 current_subfile = subfile;
753 subfile->name = xstrdup (name);
755 /* Initialize line-number recording for this subfile. */
756 subfile->line_vector = NULL;
758 /* Default the source language to whatever can be deduced from the
759 filename. If nothing can be deduced (such as for a C/C++ include
760 file with a ".h" extension), then inherit whatever language the
761 previous subfile had. This kludgery is necessary because there
762 is no standard way in some object formats to record the source
763 language. Also, when symtabs are allocated we try to deduce a
764 language then as well, but it is too late for us to use that
765 information while reading symbols, since symtabs aren't allocated
766 until after all the symbols have been processed for a given
769 subfile->language = deduce_language_from_filename (subfile->name);
770 if (subfile->language == language_unknown
771 && subfile->next != NULL)
773 subfile->language = subfile->next->language;
776 /* If the filename of this subfile ends in .C, then change the
777 language of any pending subfiles from C to C++. We also accept
778 any other C++ suffixes accepted by deduce_language_from_filename. */
779 /* Likewise for f2c. */
784 enum language sublang = deduce_language_from_filename (subfile->name);
786 if (sublang == language_cplus || sublang == language_fortran)
787 for (s = buildsym_compunit->subfiles; s != NULL; s = s->next)
788 if (s->language == language_c)
789 s->language = sublang;
792 /* And patch up this file if necessary. */
793 if (subfile->language == language_c
794 && subfile->next != NULL
795 && (subfile->next->language == language_cplus
796 || subfile->next->language == language_fortran))
798 subfile->language = subfile->next->language;
802 /* Delete the buildsym compunit. */
805 free_buildsym_compunit (void)
807 if (buildsym_compunit == NULL)
809 delete buildsym_compunit;
810 buildsym_compunit = NULL;
811 current_subfile = NULL;
814 /* For stabs readers, the first N_SO symbol is assumed to be the
815 source file name, and the subfile struct is initialized using that
816 assumption. If another N_SO symbol is later seen, immediately
817 following the first one, then the first one is assumed to be the
818 directory name and the second one is really the source file name.
820 So we have to patch up the subfile struct by moving the old name
821 value to dirname and remembering the new name. Some sanity
822 checking is performed to ensure that the state of the subfile
823 struct is reasonable and that the old name we are assuming to be a
824 directory name actually is (by checking for a trailing '/'). */
827 patch_subfile_names (struct subfile *subfile, const char *name)
830 && buildsym_compunit->comp_dir == NULL
831 && subfile->name != NULL
832 && IS_DIR_SEPARATOR (subfile->name[strlen (subfile->name) - 1]))
834 buildsym_compunit->comp_dir.reset (subfile->name);
835 subfile->name = xstrdup (name);
836 set_last_source_file (name);
838 /* Default the source language to whatever can be deduced from
839 the filename. If nothing can be deduced (such as for a C/C++
840 include file with a ".h" extension), then inherit whatever
841 language the previous subfile had. This kludgery is
842 necessary because there is no standard way in some object
843 formats to record the source language. Also, when symtabs
844 are allocated we try to deduce a language then as well, but
845 it is too late for us to use that information while reading
846 symbols, since symtabs aren't allocated until after all the
847 symbols have been processed for a given source file. */
849 subfile->language = deduce_language_from_filename (subfile->name);
850 if (subfile->language == language_unknown
851 && subfile->next != NULL)
853 subfile->language = subfile->next->language;
858 /* Handle the N_BINCL and N_EINCL symbol types that act like N_SOL for
859 switching source files (different subfiles, as we call them) within
860 one object file, but using a stack rather than in an arbitrary
866 struct subfile_stack *tem = XNEW (struct subfile_stack);
868 tem->next = subfile_stack;
870 if (current_subfile == NULL || current_subfile->name == NULL)
872 internal_error (__FILE__, __LINE__,
873 _("failed internal consistency check"));
875 tem->name = current_subfile->name;
882 struct subfile_stack *link = subfile_stack;
886 internal_error (__FILE__, __LINE__,
887 _("failed internal consistency check"));
890 subfile_stack = link->next;
891 xfree ((void *) link);
895 /* Add a linetable entry for line number LINE and address PC to the
896 line vector for SUBFILE. */
899 record_line (struct subfile *subfile, int line, CORE_ADDR pc)
901 struct linetable_entry *e;
903 /* Ignore the dummy line number in libg.o */
909 /* Make sure line vector exists and is big enough. */
910 if (!subfile->line_vector)
912 subfile->line_vector_length = INITIAL_LINE_VECTOR_LENGTH;
913 subfile->line_vector = (struct linetable *)
914 xmalloc (sizeof (struct linetable)
915 + subfile->line_vector_length * sizeof (struct linetable_entry));
916 subfile->line_vector->nitems = 0;
917 have_line_numbers = 1;
920 if (subfile->line_vector->nitems + 1 >= subfile->line_vector_length)
922 subfile->line_vector_length *= 2;
923 subfile->line_vector = (struct linetable *)
924 xrealloc ((char *) subfile->line_vector,
925 (sizeof (struct linetable)
926 + (subfile->line_vector_length
927 * sizeof (struct linetable_entry))));
930 /* Normally, we treat lines as unsorted. But the end of sequence
931 marker is special. We sort line markers at the same PC by line
932 number, so end of sequence markers (which have line == 0) appear
933 first. This is right if the marker ends the previous function,
934 and there is no padding before the next function. But it is
935 wrong if the previous line was empty and we are now marking a
936 switch to a different subfile. We must leave the end of sequence
937 marker at the end of this group of lines, not sort the empty line
938 to after the marker. The easiest way to accomplish this is to
939 delete any empty lines from our table, if they are followed by
940 end of sequence markers. All we lose is the ability to set
941 breakpoints at some lines which contain no instructions
943 if (line == 0 && subfile->line_vector->nitems > 0)
945 e = subfile->line_vector->item + subfile->line_vector->nitems - 1;
946 while (subfile->line_vector->nitems > 0 && e->pc == pc)
949 subfile->line_vector->nitems--;
953 e = subfile->line_vector->item + subfile->line_vector->nitems++;
958 /* Needed in order to sort line tables from IBM xcoff files. Sigh! */
961 compare_line_numbers (const void *ln1p, const void *ln2p)
963 struct linetable_entry *ln1 = (struct linetable_entry *) ln1p;
964 struct linetable_entry *ln2 = (struct linetable_entry *) ln2p;
966 /* Note: this code does not assume that CORE_ADDRs can fit in ints.
967 Please keep it that way. */
968 if (ln1->pc < ln2->pc)
971 if (ln1->pc > ln2->pc)
974 /* If pc equal, sort by line. I'm not sure whether this is optimum
975 behavior (see comment at struct linetable in symtab.h). */
976 return ln1->line - ln2->line;
979 /* See buildsym.h. */
981 struct compunit_symtab *
982 buildsym_compunit_symtab (void)
984 gdb_assert (buildsym_compunit != NULL);
986 return buildsym_compunit->compunit_symtab;
989 /* See buildsym.h. */
992 get_macro_table (void)
994 struct objfile *objfile;
996 gdb_assert (buildsym_compunit != NULL);
998 objfile = buildsym_compunit->objfile;
1000 if (! pending_macros)
1002 pending_macros = new_macro_table (&objfile->per_bfd->storage_obstack,
1003 objfile->per_bfd->macro_cache,
1004 buildsym_compunit->compunit_symtab);
1007 return pending_macros;
1010 /* Init state to prepare for building a symtab.
1011 Note: This can't be done in buildsym_init because dbxread.c and xcoffread.c
1012 can call start_symtab+end_symtab multiple times after one call to
1016 prepare_for_building (CORE_ADDR start_addr)
1018 last_source_start_addr = start_addr;
1020 local_symbols = NULL;
1021 local_using_directives = NULL;
1022 within_function = 0;
1023 have_line_numbers = 0;
1025 context_stack_depth = 0;
1027 /* These should have been reset either by successful completion of building
1028 a symtab, or by the scoped_free_pendings destructor. */
1029 gdb_assert (file_symbols == NULL);
1030 gdb_assert (global_symbols == NULL);
1031 gdb_assert (global_using_directives == NULL);
1032 gdb_assert (pending_macros == NULL);
1033 gdb_assert (pending_addrmap == NULL);
1034 gdb_assert (current_subfile == NULL);
1035 gdb_assert (buildsym_compunit == nullptr);
1038 /* Start a new symtab for a new source file in OBJFILE. Called, for example,
1039 when a stabs symbol of type N_SO is seen, or when a DWARF
1040 TAG_compile_unit DIE is seen. It indicates the start of data for
1041 one original source file.
1043 NAME is the name of the file (cannot be NULL). COMP_DIR is the
1044 directory in which the file was compiled (or NULL if not known).
1045 START_ADDR is the lowest address of objects in the file (or 0 if
1046 not known). LANGUAGE is the language of the source file, or
1047 language_unknown if not known, in which case it'll be deduced from
1050 struct compunit_symtab *
1051 start_symtab (struct objfile *objfile, const char *name, const char *comp_dir,
1052 CORE_ADDR start_addr, enum language language)
1054 prepare_for_building (start_addr);
1056 buildsym_compunit = new struct buildsym_compunit (objfile, name, comp_dir,
1059 /* Allocate the compunit symtab now. The caller needs it to allocate
1060 non-primary symtabs. It is also needed by get_macro_table. */
1061 buildsym_compunit->compunit_symtab = allocate_compunit_symtab (objfile,
1064 /* Build the subfile for NAME (the main source file) so that we can record
1065 a pointer to it for later.
1066 IMPORTANT: Do not allocate a struct symtab for NAME here.
1067 It can happen that the debug info provides a different path to NAME than
1068 DIRNAME,NAME. We cope with this in watch_main_source_file_lossage but
1069 that only works if the main_subfile doesn't have a symtab yet. */
1070 start_subfile (name);
1071 /* Save this so that we don't have to go looking for it at the end
1072 of the subfiles list. */
1073 buildsym_compunit->main_subfile = current_subfile;
1075 return buildsym_compunit->compunit_symtab;
1078 /* Restart compilation for a symtab.
1079 CUST is the result of end_expandable_symtab.
1080 NAME, START_ADDR are the source file we are resuming with.
1082 This is used when a symtab is built from multiple sources.
1083 The symtab is first built with start_symtab/end_expandable_symtab
1084 and then for each additional piece call restart_symtab/augment_*_symtab.
1085 Note: At the moment there is only augment_type_symtab. */
1088 restart_symtab (struct compunit_symtab *cust,
1089 const char *name, CORE_ADDR start_addr)
1091 prepare_for_building (start_addr);
1094 = new struct buildsym_compunit (COMPUNIT_OBJFILE (cust),
1096 COMPUNIT_DIRNAME (cust),
1097 compunit_language (cust));
1098 buildsym_compunit->compunit_symtab = cust;
1101 /* Subroutine of end_symtab to simplify it. Look for a subfile that
1102 matches the main source file's basename. If there is only one, and
1103 if the main source file doesn't have any symbol or line number
1104 information, then copy this file's symtab and line_vector to the
1105 main source file's subfile and discard the other subfile. This can
1106 happen because of a compiler bug or from the user playing games
1107 with #line or from things like a distributed build system that
1108 manipulates the debug info. This can also happen from an innocent
1109 symlink in the paths, we don't canonicalize paths here. */
1112 watch_main_source_file_lossage (void)
1114 struct subfile *mainsub, *subfile;
1116 /* We have to watch for buildsym_compunit == NULL here. It's a quirk of
1117 end_symtab, it can return NULL so there may not be a main subfile. */
1118 if (buildsym_compunit == NULL)
1121 /* Get the main source file. */
1122 mainsub = buildsym_compunit->main_subfile;
1124 /* If the main source file doesn't have any line number or symbol
1125 info, look for an alias in another subfile. */
1127 if (mainsub->line_vector == NULL
1128 && mainsub->symtab == NULL)
1130 const char *mainbase = lbasename (mainsub->name);
1132 struct subfile *prevsub;
1133 struct subfile *mainsub_alias = NULL;
1134 struct subfile *prev_mainsub_alias = NULL;
1137 for (subfile = buildsym_compunit->subfiles;
1139 subfile = subfile->next)
1141 if (subfile == mainsub)
1143 if (filename_cmp (lbasename (subfile->name), mainbase) == 0)
1146 mainsub_alias = subfile;
1147 prev_mainsub_alias = prevsub;
1152 if (nr_matches == 1)
1154 gdb_assert (mainsub_alias != NULL && mainsub_alias != mainsub);
1156 /* Found a match for the main source file.
1157 Copy its line_vector and symtab to the main subfile
1158 and then discard it. */
1160 mainsub->line_vector = mainsub_alias->line_vector;
1161 mainsub->line_vector_length = mainsub_alias->line_vector_length;
1162 mainsub->symtab = mainsub_alias->symtab;
1164 if (prev_mainsub_alias == NULL)
1165 buildsym_compunit->subfiles = mainsub_alias->next;
1167 prev_mainsub_alias->next = mainsub_alias->next;
1168 xfree (mainsub_alias->name);
1169 xfree (mainsub_alias);
1174 /* Reset state after a successful building of a symtab.
1175 This exists because dbxread.c and xcoffread.c can call
1176 start_symtab+end_symtab multiple times after one call to buildsym_init,
1177 and before the scoped_free_pendings destructor is called.
1178 We keep the free_pendings list around for dbx/xcoff sake. */
1181 reset_symtab_globals (void)
1183 local_symbols = NULL;
1184 local_using_directives = NULL;
1185 file_symbols = NULL;
1186 global_symbols = NULL;
1187 global_using_directives = NULL;
1189 /* We don't free pending_macros here because if the symtab was successfully
1190 built then ownership was transferred to the symtab. */
1191 pending_macros = NULL;
1193 if (pending_addrmap)
1194 obstack_free (&pending_addrmap_obstack, NULL);
1195 pending_addrmap = NULL;
1197 free_buildsym_compunit ();
1200 /* Implementation of the first part of end_symtab. It allows modifying
1201 STATIC_BLOCK before it gets finalized by end_symtab_from_static_block.
1202 If the returned value is NULL there is no blockvector created for
1203 this symtab (you still must call end_symtab_from_static_block).
1205 END_ADDR is the same as for end_symtab: the address of the end of the
1208 If EXPANDABLE is non-zero the STATIC_BLOCK dictionary is made
1211 If REQUIRED is non-zero, then a symtab is created even if it does
1212 not contain any symbols. */
1215 end_symtab_get_static_block (CORE_ADDR end_addr, int expandable, int required)
1217 struct objfile *objfile = buildsym_compunit->objfile;
1219 /* Finish the lexical context of the last function in the file; pop
1220 the context stack. */
1222 if (context_stack_depth > 0)
1224 struct context_stack *cstk = pop_context ();
1226 /* Make a block for the local symbols within. */
1227 finish_block (cstk->name, &local_symbols, cstk->old_blocks, NULL,
1228 cstk->start_addr, end_addr);
1230 if (context_stack_depth > 0)
1232 /* This is said to happen with SCO. The old coffread.c
1233 code simply emptied the context stack, so we do the
1234 same. FIXME: Find out why it is happening. This is not
1235 believed to happen in most cases (even for coffread.c);
1236 it used to be an abort(). */
1237 complaint (_("Context stack not empty in end_symtab"));
1238 context_stack_depth = 0;
1242 /* Reordered executables may have out of order pending blocks; if
1243 OBJF_REORDERED is true, then sort the pending blocks. */
1245 if ((objfile->flags & OBJF_REORDERED) && pending_blocks)
1247 struct pending_block *pb;
1249 std::vector<block *> barray;
1251 for (pb = pending_blocks; pb != NULL; pb = pb->next)
1252 barray.push_back (pb->block);
1254 /* Sort blocks by start address in descending order. Blocks with the
1255 same start address must remain in the original order to preserve
1256 inline function caller/callee relationships. */
1257 std::stable_sort (barray.begin (), barray.end (),
1258 [] (const block *a, const block *b)
1260 return BLOCK_START (a) > BLOCK_START (b);
1264 for (pb = pending_blocks; pb != NULL; pb = pb->next)
1265 pb->block = barray[i++];
1268 /* Cleanup any undefined types that have been left hanging around
1269 (this needs to be done before the finish_blocks so that
1270 file_symbols is still good).
1272 Both cleanup_undefined_stabs_types and finish_global_stabs are stabs
1273 specific, but harmless for other symbol readers, since on gdb
1274 startup or when finished reading stabs, the state is set so these
1275 are no-ops. FIXME: Is this handled right in case of QUIT? Can
1276 we make this cleaner? */
1278 cleanup_undefined_stabs_types (objfile);
1279 finish_global_stabs (objfile);
1282 && pending_blocks == NULL
1283 && file_symbols == NULL
1284 && global_symbols == NULL
1285 && have_line_numbers == 0
1286 && pending_macros == NULL
1287 && global_using_directives == NULL)
1289 /* Ignore symtabs that have no functions with real debugging info. */
1294 /* Define the STATIC_BLOCK. */
1295 return finish_block_internal (NULL, &file_symbols, NULL, NULL,
1296 last_source_start_addr, end_addr,
1301 /* Subroutine of end_symtab_from_static_block to simplify it.
1302 Handle the "have blockvector" case.
1303 See end_symtab_from_static_block for a description of the arguments. */
1305 static struct compunit_symtab *
1306 end_symtab_with_blockvector (struct block *static_block,
1307 int section, int expandable)
1309 struct objfile *objfile = buildsym_compunit->objfile;
1310 struct compunit_symtab *cu = buildsym_compunit->compunit_symtab;
1311 struct symtab *symtab;
1312 struct blockvector *blockvector;
1313 struct subfile *subfile;
1316 gdb_assert (static_block != NULL);
1317 gdb_assert (buildsym_compunit != NULL);
1318 gdb_assert (buildsym_compunit->subfiles != NULL);
1320 end_addr = BLOCK_END (static_block);
1322 /* Create the GLOBAL_BLOCK and build the blockvector. */
1323 finish_block_internal (NULL, &global_symbols, NULL, NULL,
1324 last_source_start_addr, end_addr,
1326 blockvector = make_blockvector ();
1328 /* Read the line table if it has to be read separately.
1329 This is only used by xcoffread.c. */
1330 if (objfile->sf->sym_read_linetable != NULL)
1331 objfile->sf->sym_read_linetable (objfile);
1333 /* Handle the case where the debug info specifies a different path
1334 for the main source file. It can cause us to lose track of its
1335 line number information. */
1336 watch_main_source_file_lossage ();
1338 /* Now create the symtab objects proper, if not already done,
1339 one for each subfile. */
1341 for (subfile = buildsym_compunit->subfiles;
1343 subfile = subfile->next)
1345 int linetablesize = 0;
1347 if (subfile->line_vector)
1349 linetablesize = sizeof (struct linetable) +
1350 subfile->line_vector->nitems * sizeof (struct linetable_entry);
1352 /* Like the pending blocks, the line table may be
1353 scrambled in reordered executables. Sort it if
1354 OBJF_REORDERED is true. */
1355 if (objfile->flags & OBJF_REORDERED)
1356 qsort (subfile->line_vector->item,
1357 subfile->line_vector->nitems,
1358 sizeof (struct linetable_entry), compare_line_numbers);
1361 /* Allocate a symbol table if necessary. */
1362 if (subfile->symtab == NULL)
1363 subfile->symtab = allocate_symtab (cu, subfile->name);
1364 symtab = subfile->symtab;
1366 /* Fill in its components. */
1368 if (subfile->line_vector)
1370 /* Reallocate the line table on the symbol obstack. */
1371 SYMTAB_LINETABLE (symtab) = (struct linetable *)
1372 obstack_alloc (&objfile->objfile_obstack, linetablesize);
1373 memcpy (SYMTAB_LINETABLE (symtab), subfile->line_vector,
1378 SYMTAB_LINETABLE (symtab) = NULL;
1381 /* Use whatever language we have been using for this
1382 subfile, not the one that was deduced in allocate_symtab
1383 from the filename. We already did our own deducing when
1384 we created the subfile, and we may have altered our
1385 opinion of what language it is from things we found in
1387 symtab->language = subfile->language;
1390 /* Make sure the symtab of main_subfile is the first in its list. */
1392 struct symtab *main_symtab, *prev_symtab;
1394 main_symtab = buildsym_compunit->main_subfile->symtab;
1396 ALL_COMPUNIT_FILETABS (cu, symtab)
1398 if (symtab == main_symtab)
1400 if (prev_symtab != NULL)
1402 prev_symtab->next = main_symtab->next;
1403 main_symtab->next = COMPUNIT_FILETABS (cu);
1404 COMPUNIT_FILETABS (cu) = main_symtab;
1408 prev_symtab = symtab;
1410 gdb_assert (main_symtab == COMPUNIT_FILETABS (cu));
1413 /* Fill out the compunit symtab. */
1415 if (buildsym_compunit->comp_dir != NULL)
1417 /* Reallocate the dirname on the symbol obstack. */
1418 const char *comp_dir = buildsym_compunit->comp_dir.get ();
1419 COMPUNIT_DIRNAME (cu)
1420 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
1421 comp_dir, strlen (comp_dir));
1424 /* Save the debug format string (if any) in the symtab. */
1425 COMPUNIT_DEBUGFORMAT (cu) = buildsym_compunit->debugformat;
1427 /* Similarly for the producer. */
1428 COMPUNIT_PRODUCER (cu) = buildsym_compunit->producer;
1430 COMPUNIT_BLOCKVECTOR (cu) = blockvector;
1432 struct block *b = BLOCKVECTOR_BLOCK (blockvector, GLOBAL_BLOCK);
1434 set_block_compunit_symtab (b, cu);
1437 COMPUNIT_BLOCK_LINE_SECTION (cu) = section;
1439 COMPUNIT_MACRO_TABLE (cu) = pending_macros;
1441 /* Default any symbols without a specified symtab to the primary symtab. */
1445 /* The main source file's symtab. */
1446 symtab = COMPUNIT_FILETABS (cu);
1448 for (block_i = 0; block_i < BLOCKVECTOR_NBLOCKS (blockvector); block_i++)
1450 struct block *block = BLOCKVECTOR_BLOCK (blockvector, block_i);
1452 struct dict_iterator iter;
1454 /* Inlined functions may have symbols not in the global or
1455 static symbol lists. */
1456 if (BLOCK_FUNCTION (block) != NULL)
1457 if (symbol_symtab (BLOCK_FUNCTION (block)) == NULL)
1458 symbol_set_symtab (BLOCK_FUNCTION (block), symtab);
1460 /* Note that we only want to fix up symbols from the local
1461 blocks, not blocks coming from included symtabs. That is why
1462 we use ALL_DICT_SYMBOLS here and not ALL_BLOCK_SYMBOLS. */
1463 ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
1464 if (symbol_symtab (sym) == NULL)
1465 symbol_set_symtab (sym, symtab);
1469 add_compunit_symtab_to_objfile (cu);
1474 /* Implementation of the second part of end_symtab. Pass STATIC_BLOCK
1475 as value returned by end_symtab_get_static_block.
1477 SECTION is the same as for end_symtab: the section number
1478 (in objfile->section_offsets) of the blockvector and linetable.
1480 If EXPANDABLE is non-zero the GLOBAL_BLOCK dictionary is made
1483 struct compunit_symtab *
1484 end_symtab_from_static_block (struct block *static_block,
1485 int section, int expandable)
1487 struct compunit_symtab *cu;
1489 if (static_block == NULL)
1491 /* Handle the "no blockvector" case.
1492 When this happens there is nothing to record, so there's nothing
1493 to do: memory will be freed up later.
1495 Note: We won't be adding a compunit to the objfile's list of
1496 compunits, so there's nothing to unchain. However, since each symtab
1497 is added to the objfile's obstack we can't free that space.
1498 We could do better, but this is believed to be a sufficiently rare
1503 cu = end_symtab_with_blockvector (static_block, section, expandable);
1505 reset_symtab_globals ();
1510 /* Finish the symbol definitions for one main source file, close off
1511 all the lexical contexts for that file (creating struct block's for
1512 them), then make the struct symtab for that file and put it in the
1515 END_ADDR is the address of the end of the file's text. SECTION is
1516 the section number (in objfile->section_offsets) of the blockvector
1519 Note that it is possible for end_symtab() to return NULL. In
1520 particular, for the DWARF case at least, it will return NULL when
1521 it finds a compilation unit that has exactly one DIE, a
1522 TAG_compile_unit DIE. This can happen when we link in an object
1523 file that was compiled from an empty source file. Returning NULL
1524 is probably not the correct thing to do, because then gdb will
1525 never know about this empty file (FIXME).
1527 If you need to modify STATIC_BLOCK before it is finalized you should
1528 call end_symtab_get_static_block and end_symtab_from_static_block
1531 struct compunit_symtab *
1532 end_symtab (CORE_ADDR end_addr, int section)
1534 struct block *static_block;
1536 static_block = end_symtab_get_static_block (end_addr, 0, 0);
1537 return end_symtab_from_static_block (static_block, section, 0);
1540 /* Same as end_symtab except create a symtab that can be later added to. */
1542 struct compunit_symtab *
1543 end_expandable_symtab (CORE_ADDR end_addr, int section)
1545 struct block *static_block;
1547 static_block = end_symtab_get_static_block (end_addr, 1, 0);
1548 return end_symtab_from_static_block (static_block, section, 1);
1551 /* Subroutine of augment_type_symtab to simplify it.
1552 Attach the main source file's symtab to all symbols in PENDING_LIST that
1556 set_missing_symtab (struct pending *pending_list,
1557 struct compunit_symtab *cu)
1559 struct pending *pending;
1562 for (pending = pending_list; pending != NULL; pending = pending->next)
1564 for (i = 0; i < pending->nsyms; ++i)
1566 if (symbol_symtab (pending->symbol[i]) == NULL)
1567 symbol_set_symtab (pending->symbol[i], COMPUNIT_FILETABS (cu));
1572 /* Same as end_symtab, but for the case where we're adding more symbols
1573 to an existing symtab that is known to contain only type information.
1574 This is the case for DWARF4 Type Units. */
1577 augment_type_symtab (void)
1579 struct compunit_symtab *cust = buildsym_compunit->compunit_symtab;
1580 const struct blockvector *blockvector = COMPUNIT_BLOCKVECTOR (cust);
1582 if (context_stack_depth > 0)
1584 complaint (_("Context stack not empty in augment_type_symtab"));
1585 context_stack_depth = 0;
1587 if (pending_blocks != NULL)
1588 complaint (_("Blocks in a type symtab"));
1589 if (pending_macros != NULL)
1590 complaint (_("Macro in a type symtab"));
1591 if (have_line_numbers)
1592 complaint (_("Line numbers recorded in a type symtab"));
1594 if (file_symbols != NULL)
1596 struct block *block = BLOCKVECTOR_BLOCK (blockvector, STATIC_BLOCK);
1598 /* First mark any symbols without a specified symtab as belonging
1599 to the primary symtab. */
1600 set_missing_symtab (file_symbols, cust);
1602 dict_add_pending (BLOCK_DICT (block), file_symbols);
1605 if (global_symbols != NULL)
1607 struct block *block = BLOCKVECTOR_BLOCK (blockvector, GLOBAL_BLOCK);
1609 /* First mark any symbols without a specified symtab as belonging
1610 to the primary symtab. */
1611 set_missing_symtab (global_symbols, cust);
1613 dict_add_pending (BLOCK_DICT (block), global_symbols);
1616 reset_symtab_globals ();
1619 /* Push a context block. Args are an identifying nesting level
1620 (checkable when you pop it), and the starting PC address of this
1623 struct context_stack *
1624 push_context (int desc, CORE_ADDR valu)
1626 struct context_stack *newobj;
1628 if (context_stack_depth == context_stack_size)
1630 context_stack_size *= 2;
1631 context_stack = (struct context_stack *)
1632 xrealloc ((char *) context_stack,
1633 (context_stack_size * sizeof (struct context_stack)));
1636 newobj = &context_stack[context_stack_depth++];
1637 newobj->depth = desc;
1638 newobj->locals = local_symbols;
1639 newobj->old_blocks = pending_blocks;
1640 newobj->start_addr = valu;
1641 newobj->local_using_directives = local_using_directives;
1642 newobj->name = NULL;
1644 local_symbols = NULL;
1645 local_using_directives = NULL;
1650 /* Pop a context block. Returns the address of the context block just
1653 struct context_stack *
1656 gdb_assert (context_stack_depth > 0);
1657 return (&context_stack[--context_stack_depth]);
1662 /* Compute a small integer hash code for the given name. */
1665 hashname (const char *name)
1667 return (hash(name,strlen(name)) % HASHSIZE);
1672 record_debugformat (const char *format)
1674 buildsym_compunit->debugformat = format;
1678 record_producer (const char *producer)
1680 buildsym_compunit->producer = producer;
1683 /* Merge the first symbol list SRCLIST into the second symbol list
1684 TARGETLIST by repeated calls to add_symbol_to_list(). This
1685 procedure "frees" each link of SRCLIST by adding it to the
1686 free_pendings list. Caller must set SRCLIST to a null list after
1687 calling this function.
1692 merge_symbol_lists (struct pending **srclist, struct pending **targetlist)
1696 if (!srclist || !*srclist)
1699 /* Merge in elements from current link. */
1700 for (i = 0; i < (*srclist)->nsyms; i++)
1701 add_symbol_to_list ((*srclist)->symbol[i], targetlist);
1703 /* Recurse on next. */
1704 merge_symbol_lists (&(*srclist)->next, targetlist);
1706 /* "Free" the current link. */
1707 (*srclist)->next = free_pendings;
1708 free_pendings = (*srclist);
1712 /* See buildsym.h. */
1715 set_last_source_file (const char *name)
1717 gdb_assert (buildsym_compunit != nullptr || name == nullptr);
1718 if (buildsym_compunit != nullptr)
1719 buildsym_compunit->set_last_source_file (name);
1722 /* See buildsym.h. */
1725 get_last_source_file (void)
1727 if (buildsym_compunit == nullptr)
1729 return buildsym_compunit->m_last_source_file.get ();
1734 /* Initialize anything that needs initializing when starting to read a
1735 fresh piece of a symbol file, e.g. reading in the stuff
1736 corresponding to a psymtab. */
1739 buildsym_init (void)
1741 subfile_stack = NULL;
1743 pending_addrmap_interesting = 0;
1745 /* Context stack is initially empty. Allocate first one with room
1746 for a few levels; reuse it forever afterward. */
1747 if (context_stack == NULL)
1749 context_stack_size = INITIAL_CONTEXT_STACK_SIZE;
1750 context_stack = XNEWVEC (struct context_stack, context_stack_size);
1753 /* Ensure the scoped_free_pendings destructor was called after
1755 gdb_assert (free_pendings == NULL);
1756 gdb_assert (pending_blocks == NULL);
1757 gdb_assert (file_symbols == NULL);
1758 gdb_assert (global_symbols == NULL);
1759 gdb_assert (global_using_directives == NULL);
1760 gdb_assert (pending_macros == NULL);
1761 gdb_assert (pending_addrmap == NULL);
1762 gdb_assert (buildsym_compunit == NULL);
1765 /* Initialize anything that needs initializing when a completely new
1766 symbol file is specified (not just adding some symbols from another
1767 file, e.g. a shared library). */
1770 buildsym_new_init (void)