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 /* The objfile we're reading debug info from. */
104 struct objfile *objfile;
106 /* List of subfiles (source files).
107 Files are added to the front of the list.
108 This is important mostly for the language determination hacks we use,
109 which iterate over previously added files. */
110 struct subfile *subfiles;
112 /* The subfile of the main source file. */
113 struct subfile *main_subfile;
115 /* E.g., DW_AT_comp_dir if DWARF. Space for this is malloc'd. */
118 /* Space for this is not malloc'd, and is assumed to have at least
119 the same lifetime as objfile. */
120 const char *producer;
122 /* Space for this is not malloc'd, and is assumed to have at least
123 the same lifetime as objfile. */
124 const char *debugformat;
126 /* The compunit we are building. */
127 struct compunit_symtab *compunit_symtab;
129 /* Language of this compunit_symtab. */
130 enum language language;
133 /* The work-in-progress of the compunit we are building.
134 This is created first, before any subfiles by start_symtab. */
136 static struct buildsym_compunit *buildsym_compunit;
138 /* List of free `struct pending' structures for reuse. */
140 static struct pending *free_pendings;
142 /* Non-zero if symtab has line number info. This prevents an
143 otherwise empty symtab from being tossed. */
145 static int have_line_numbers;
147 /* The mutable address map for the compilation unit whose symbols
148 we're currently reading. The symtabs' shared blockvector will
149 point to a fixed copy of this. */
150 static struct addrmap *pending_addrmap;
152 /* The obstack on which we allocate pending_addrmap.
153 If pending_addrmap is NULL, this is uninitialized; otherwise, it is
154 initialized (and holds pending_addrmap). */
155 static struct obstack pending_addrmap_obstack;
157 /* Non-zero if we recorded any ranges in the addrmap that are
158 different from those in the blockvector already. We set this to
159 zero when we start processing a symfile, and if it's still zero at
160 the end, then we just toss the addrmap. */
161 static int pending_addrmap_interesting;
163 /* An obstack used for allocating pending blocks. */
165 static struct obstack pending_block_obstack;
167 /* List of blocks already made (lexical contexts already closed).
168 This is used at the end to make the blockvector. */
172 struct pending_block *next;
176 /* Pointer to the head of a linked list of symbol blocks which have
177 already been finalized (lexical contexts already closed) and which
178 are just waiting to be built into a blockvector when finalizing the
179 associated symtab. */
181 static struct pending_block *pending_blocks;
185 struct subfile_stack *next;
189 static struct subfile_stack *subfile_stack;
191 /* The macro table for the compilation unit whose symbols we're
192 currently reading. */
193 static struct macro_table *pending_macros;
195 static void free_buildsym_compunit (void);
197 static int compare_line_numbers (const void *ln1p, const void *ln2p);
199 static void record_pending_block (struct objfile *objfile,
201 struct pending_block *opblock);
203 /* Initial sizes of data structures. These are realloc'd larger if
204 needed, and realloc'd down to the size actually used, when
207 #define INITIAL_CONTEXT_STACK_SIZE 10
208 #define INITIAL_LINE_VECTOR_LENGTH 1000
211 /* Maintain the lists of symbols and blocks. */
213 /* Add a symbol to one of the lists of symbols. */
216 add_symbol_to_list (struct symbol *symbol, struct pending **listhead)
218 struct pending *link;
220 /* If this is an alias for another symbol, don't add it. */
221 if (symbol->ginfo.name && symbol->ginfo.name[0] == '#')
224 /* We keep PENDINGSIZE symbols in each link of the list. If we
225 don't have a link with room in it, add a new link. */
226 if (*listhead == NULL || (*listhead)->nsyms == PENDINGSIZE)
230 link = free_pendings;
231 free_pendings = link->next;
235 link = XNEW (struct pending);
238 link->next = *listhead;
243 (*listhead)->symbol[(*listhead)->nsyms++] = symbol;
246 /* Find a symbol named NAME on a LIST. NAME need not be
247 '\0'-terminated; LENGTH is the length of the name. */
250 find_symbol_in_list (struct pending *list, char *name, int length)
257 for (j = list->nsyms; --j >= 0;)
259 pp = SYMBOL_LINKAGE_NAME (list->symbol[j]);
260 if (*pp == *name && strncmp (pp, name, length) == 0
261 && pp[length] == '\0')
263 return (list->symbol[j]);
271 /* At end of reading syms, or in case of quit, ensure everything
272 associated with building symtabs is freed.
274 N.B. This is *not* intended to be used when building psymtabs. Some debug
275 info readers call this anyway, which is harmless if confusing. */
277 scoped_free_pendings::~scoped_free_pendings ()
279 struct pending *next, *next1;
281 for (next = free_pendings; next; next = next1)
284 xfree ((void *) next);
286 free_pendings = NULL;
288 free_pending_blocks ();
290 for (next = file_symbols; next != NULL; next = next1)
293 xfree ((void *) next);
297 for (next = global_symbols; next != NULL; next = next1)
300 xfree ((void *) next);
302 global_symbols = NULL;
305 free_macro_table (pending_macros);
306 pending_macros = NULL;
309 obstack_free (&pending_addrmap_obstack, NULL);
310 pending_addrmap = NULL;
312 free_buildsym_compunit ();
315 /* This function is called to discard any pending blocks. */
318 free_pending_blocks (void)
320 if (pending_blocks != NULL)
322 obstack_free (&pending_block_obstack, NULL);
323 pending_blocks = NULL;
327 /* Take one of the lists of symbols and make a block from it. Keep
328 the order the symbols have in the list (reversed from the input
329 file). Put the block on the list of pending blocks. */
331 static struct block *
332 finish_block_internal (struct symbol *symbol,
333 struct pending **listhead,
334 struct pending_block *old_blocks,
335 const struct dynamic_prop *static_link,
336 CORE_ADDR start, CORE_ADDR end,
337 int is_global, int expandable)
339 struct objfile *objfile = buildsym_compunit->objfile;
340 struct gdbarch *gdbarch = get_objfile_arch (objfile);
341 struct pending *next, *next1;
343 struct pending_block *pblock;
344 struct pending_block *opblock;
347 ? allocate_global_block (&objfile->objfile_obstack)
348 : allocate_block (&objfile->objfile_obstack));
353 = dict_create_linear (&objfile->objfile_obstack,
354 buildsym_compunit->language, *listhead);
361 = dict_create_hashed_expandable (buildsym_compunit->language);
362 dict_add_pending (BLOCK_DICT (block), *listhead);
367 dict_create_hashed (&objfile->objfile_obstack,
368 buildsym_compunit->language, *listhead);
372 BLOCK_START (block) = start;
373 BLOCK_END (block) = end;
375 /* Put the block in as the value of the symbol that names it. */
379 struct type *ftype = SYMBOL_TYPE (symbol);
380 struct dict_iterator iter;
381 SYMBOL_BLOCK_VALUE (symbol) = block;
382 BLOCK_FUNCTION (block) = symbol;
384 if (TYPE_NFIELDS (ftype) <= 0)
386 /* No parameter type information is recorded with the
387 function's type. Set that from the type of the
388 parameter symbols. */
389 int nparams = 0, iparams;
392 /* Here we want to directly access the dictionary, because
393 we haven't fully initialized the block yet. */
394 ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
396 if (SYMBOL_IS_ARGUMENT (sym))
401 TYPE_NFIELDS (ftype) = nparams;
402 TYPE_FIELDS (ftype) = (struct field *)
403 TYPE_ALLOC (ftype, nparams * sizeof (struct field));
406 /* Here we want to directly access the dictionary, because
407 we haven't fully initialized the block yet. */
408 ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
410 if (iparams == nparams)
413 if (SYMBOL_IS_ARGUMENT (sym))
415 TYPE_FIELD_TYPE (ftype, iparams) = SYMBOL_TYPE (sym);
416 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
425 BLOCK_FUNCTION (block) = NULL;
428 if (static_link != NULL)
429 objfile_register_static_link (objfile, block, static_link);
431 /* Now "free" the links of the list, and empty the list. */
433 for (next = *listhead; next; next = next1)
436 next->next = free_pendings;
437 free_pendings = next;
441 /* Check to be sure that the blocks have an end address that is
442 greater than starting address. */
444 if (BLOCK_END (block) < BLOCK_START (block))
448 complaint (_("block end address less than block "
449 "start address in %s (patched it)"),
450 SYMBOL_PRINT_NAME (symbol));
454 complaint (_("block end address %s less than block "
455 "start address %s (patched it)"),
456 paddress (gdbarch, BLOCK_END (block)),
457 paddress (gdbarch, BLOCK_START (block)));
459 /* Better than nothing. */
460 BLOCK_END (block) = BLOCK_START (block);
463 /* Install this block as the superblock of all blocks made since the
464 start of this scope that don't have superblocks yet. */
467 for (pblock = pending_blocks;
468 pblock && pblock != old_blocks;
469 pblock = pblock->next)
471 if (BLOCK_SUPERBLOCK (pblock->block) == NULL)
473 /* Check to be sure the blocks are nested as we receive
474 them. If the compiler/assembler/linker work, this just
475 burns a small amount of time.
477 Skip blocks which correspond to a function; they're not
478 physically nested inside this other blocks, only
480 if (BLOCK_FUNCTION (pblock->block) == NULL
481 && (BLOCK_START (pblock->block) < BLOCK_START (block)
482 || BLOCK_END (pblock->block) > BLOCK_END (block)))
486 complaint (_("inner block not inside outer block in %s"),
487 SYMBOL_PRINT_NAME (symbol));
491 complaint (_("inner block (%s-%s) not "
492 "inside outer block (%s-%s)"),
493 paddress (gdbarch, BLOCK_START (pblock->block)),
494 paddress (gdbarch, BLOCK_END (pblock->block)),
495 paddress (gdbarch, BLOCK_START (block)),
496 paddress (gdbarch, BLOCK_END (block)));
498 if (BLOCK_START (pblock->block) < BLOCK_START (block))
499 BLOCK_START (pblock->block) = BLOCK_START (block);
500 if (BLOCK_END (pblock->block) > BLOCK_END (block))
501 BLOCK_END (pblock->block) = BLOCK_END (block);
503 BLOCK_SUPERBLOCK (pblock->block) = block;
508 block_set_using (block,
510 ? global_using_directives
511 : local_using_directives),
512 &objfile->objfile_obstack);
514 global_using_directives = NULL;
516 local_using_directives = NULL;
518 record_pending_block (objfile, block, opblock);
524 finish_block (struct symbol *symbol,
525 struct pending **listhead,
526 struct pending_block *old_blocks,
527 const struct dynamic_prop *static_link,
528 CORE_ADDR start, CORE_ADDR end)
530 return finish_block_internal (symbol, listhead, old_blocks, static_link,
534 /* Record BLOCK on the list of all blocks in the file. Put it after
535 OPBLOCK, or at the beginning if opblock is NULL. This puts the
536 block in the list after all its subblocks.
538 Allocate the pending block struct in the objfile_obstack to save
539 time. This wastes a little space. FIXME: Is it worth it? */
542 record_pending_block (struct objfile *objfile, struct block *block,
543 struct pending_block *opblock)
545 struct pending_block *pblock;
547 if (pending_blocks == NULL)
548 obstack_init (&pending_block_obstack);
550 pblock = XOBNEW (&pending_block_obstack, struct pending_block);
551 pblock->block = block;
554 pblock->next = opblock->next;
555 opblock->next = pblock;
559 pblock->next = pending_blocks;
560 pending_blocks = pblock;
565 /* Record that the range of addresses from START to END_INCLUSIVE
566 (inclusive, like it says) belongs to BLOCK. BLOCK's start and end
567 addresses must be set already. You must apply this function to all
568 BLOCK's children before applying it to BLOCK.
570 If a call to this function complicates the picture beyond that
571 already provided by BLOCK_START and BLOCK_END, then we create an
572 address map for the block. */
574 record_block_range (struct block *block,
575 CORE_ADDR start, CORE_ADDR end_inclusive)
577 /* If this is any different from the range recorded in the block's
578 own BLOCK_START and BLOCK_END, then note that the address map has
579 become interesting. Note that even if this block doesn't have
580 any "interesting" ranges, some later block might, so we still
581 need to record this block in the addrmap. */
582 if (start != BLOCK_START (block)
583 || end_inclusive + 1 != BLOCK_END (block))
584 pending_addrmap_interesting = 1;
586 if (! pending_addrmap)
588 obstack_init (&pending_addrmap_obstack);
589 pending_addrmap = addrmap_create_mutable (&pending_addrmap_obstack);
592 addrmap_set_empty (pending_addrmap, start, end_inclusive, block);
595 static struct blockvector *
596 make_blockvector (void)
598 struct objfile *objfile = buildsym_compunit->objfile;
599 struct pending_block *next;
600 struct blockvector *blockvector;
603 /* Count the length of the list of blocks. */
605 for (next = pending_blocks, i = 0; next; next = next->next, i++)
609 blockvector = (struct blockvector *)
610 obstack_alloc (&objfile->objfile_obstack,
611 (sizeof (struct blockvector)
612 + (i - 1) * sizeof (struct block *)));
614 /* Copy the blocks into the blockvector. This is done in reverse
615 order, which happens to put the blocks into the proper order
616 (ascending starting address). finish_block has hair to insert
617 each block into the list after its subblocks in order to make
618 sure this is true. */
620 BLOCKVECTOR_NBLOCKS (blockvector) = i;
621 for (next = pending_blocks; next; next = next->next)
623 BLOCKVECTOR_BLOCK (blockvector, --i) = next->block;
626 free_pending_blocks ();
628 /* If we needed an address map for this symtab, record it in the
630 if (pending_addrmap && pending_addrmap_interesting)
631 BLOCKVECTOR_MAP (blockvector)
632 = addrmap_create_fixed (pending_addrmap, &objfile->objfile_obstack);
634 BLOCKVECTOR_MAP (blockvector) = 0;
636 /* Some compilers output blocks in the wrong order, but we depend on
637 their being in the right order so we can binary search. Check the
638 order and moan about it.
639 Note: Remember that the first two blocks are the global and static
640 blocks. We could special case that fact and begin checking at block 2.
641 To avoid making that assumption we do not. */
642 if (BLOCKVECTOR_NBLOCKS (blockvector) > 1)
644 for (i = 1; i < BLOCKVECTOR_NBLOCKS (blockvector); i++)
646 if (BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i - 1))
647 > BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i)))
650 = BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i));
652 complaint (_("block at %s out of order"),
653 hex_string ((LONGEST) start));
658 return (blockvector);
661 /* Start recording information about source code that came from an
662 included (or otherwise merged-in) source file with a different
663 name. NAME is the name of the file (cannot be NULL). */
666 start_subfile (const char *name)
668 const char *subfile_dirname;
669 struct subfile *subfile;
671 gdb_assert (buildsym_compunit != NULL);
673 subfile_dirname = buildsym_compunit->comp_dir;
675 /* See if this subfile is already registered. */
677 for (subfile = buildsym_compunit->subfiles; subfile; subfile = subfile->next)
681 /* If NAME is an absolute path, and this subfile is not, then
682 attempt to create an absolute path to compare. */
683 if (IS_ABSOLUTE_PATH (name)
684 && !IS_ABSOLUTE_PATH (subfile->name)
685 && subfile_dirname != NULL)
686 subfile_name = concat (subfile_dirname, SLASH_STRING,
687 subfile->name, (char *) NULL);
689 subfile_name = subfile->name;
691 if (FILENAME_CMP (subfile_name, name) == 0)
693 current_subfile = subfile;
694 if (subfile_name != subfile->name)
695 xfree (subfile_name);
698 if (subfile_name != subfile->name)
699 xfree (subfile_name);
702 /* This subfile is not known. Add an entry for it. */
704 subfile = XNEW (struct subfile);
705 memset (subfile, 0, sizeof (struct subfile));
706 subfile->buildsym_compunit = buildsym_compunit;
708 subfile->next = buildsym_compunit->subfiles;
709 buildsym_compunit->subfiles = subfile;
711 current_subfile = subfile;
713 subfile->name = xstrdup (name);
715 /* Initialize line-number recording for this subfile. */
716 subfile->line_vector = NULL;
718 /* Default the source language to whatever can be deduced from the
719 filename. If nothing can be deduced (such as for a C/C++ include
720 file with a ".h" extension), then inherit whatever language the
721 previous subfile had. This kludgery is necessary because there
722 is no standard way in some object formats to record the source
723 language. Also, when symtabs are allocated we try to deduce a
724 language then as well, but it is too late for us to use that
725 information while reading symbols, since symtabs aren't allocated
726 until after all the symbols have been processed for a given
729 subfile->language = deduce_language_from_filename (subfile->name);
730 if (subfile->language == language_unknown
731 && subfile->next != NULL)
733 subfile->language = subfile->next->language;
736 /* If the filename of this subfile ends in .C, then change the
737 language of any pending subfiles from C to C++. We also accept
738 any other C++ suffixes accepted by deduce_language_from_filename. */
739 /* Likewise for f2c. */
744 enum language sublang = deduce_language_from_filename (subfile->name);
746 if (sublang == language_cplus || sublang == language_fortran)
747 for (s = buildsym_compunit->subfiles; s != NULL; s = s->next)
748 if (s->language == language_c)
749 s->language = sublang;
752 /* And patch up this file if necessary. */
753 if (subfile->language == language_c
754 && subfile->next != NULL
755 && (subfile->next->language == language_cplus
756 || subfile->next->language == language_fortran))
758 subfile->language = subfile->next->language;
762 /* Start recording information about a primary source file (IOW, not an
763 included source file).
764 COMP_DIR is the directory in which the compilation unit was compiled
765 (or NULL if not known). */
767 static struct buildsym_compunit *
768 start_buildsym_compunit (struct objfile *objfile, const char *comp_dir,
769 enum language language)
771 struct buildsym_compunit *bscu;
773 bscu = XNEW (struct buildsym_compunit);
774 memset (bscu, 0, sizeof (struct buildsym_compunit));
776 bscu->objfile = objfile;
777 bscu->comp_dir = (comp_dir == NULL) ? NULL : xstrdup (comp_dir);
778 bscu->language = language;
780 /* Initialize the debug format string to NULL. We may supply it
781 later via a call to record_debugformat. */
782 bscu->debugformat = NULL;
784 /* Similarly for the producer. */
785 bscu->producer = NULL;
790 /* Delete the buildsym compunit. */
793 free_buildsym_compunit (void)
795 struct subfile *subfile, *nextsub;
797 if (buildsym_compunit == NULL)
799 for (subfile = buildsym_compunit->subfiles;
803 nextsub = subfile->next;
804 xfree (subfile->name);
805 xfree (subfile->line_vector);
808 xfree (buildsym_compunit->comp_dir);
809 xfree (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 = 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 (const char *name, CORE_ADDR start_addr)
1018 set_last_source_file (name);
1019 last_source_start_addr = start_addr;
1021 local_symbols = NULL;
1022 local_using_directives = NULL;
1023 within_function = 0;
1024 have_line_numbers = 0;
1026 context_stack_depth = 0;
1028 /* These should have been reset either by successful completion of building
1029 a symtab, or by the scoped_free_pendings destructor. */
1030 gdb_assert (file_symbols == NULL);
1031 gdb_assert (global_symbols == NULL);
1032 gdb_assert (global_using_directives == NULL);
1033 gdb_assert (pending_macros == NULL);
1034 gdb_assert (pending_addrmap == NULL);
1035 gdb_assert (current_subfile == NULL);
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 (name, start_addr);
1056 buildsym_compunit = start_buildsym_compunit (objfile, comp_dir, language);
1058 /* Allocate the compunit symtab now. The caller needs it to allocate
1059 non-primary symtabs. It is also needed by get_macro_table. */
1060 buildsym_compunit->compunit_symtab = allocate_compunit_symtab (objfile,
1063 /* Build the subfile for NAME (the main source file) so that we can record
1064 a pointer to it for later.
1065 IMPORTANT: Do not allocate a struct symtab for NAME here.
1066 It can happen that the debug info provides a different path to NAME than
1067 DIRNAME,NAME. We cope with this in watch_main_source_file_lossage but
1068 that only works if the main_subfile doesn't have a symtab yet. */
1069 start_subfile (name);
1070 /* Save this so that we don't have to go looking for it at the end
1071 of the subfiles list. */
1072 buildsym_compunit->main_subfile = current_subfile;
1074 return buildsym_compunit->compunit_symtab;
1077 /* Restart compilation for a symtab.
1078 CUST is the result of end_expandable_symtab.
1079 NAME, START_ADDR are the source file we are resuming with.
1081 This is used when a symtab is built from multiple sources.
1082 The symtab is first built with start_symtab/end_expandable_symtab
1083 and then for each additional piece call restart_symtab/augment_*_symtab.
1084 Note: At the moment there is only augment_type_symtab. */
1087 restart_symtab (struct compunit_symtab *cust,
1088 const char *name, CORE_ADDR start_addr)
1090 prepare_for_building (name, start_addr);
1092 buildsym_compunit = start_buildsym_compunit (COMPUNIT_OBJFILE (cust),
1093 COMPUNIT_DIRNAME (cust),
1094 compunit_language (cust));
1095 buildsym_compunit->compunit_symtab = cust;
1098 /* Subroutine of end_symtab to simplify it. Look for a subfile that
1099 matches the main source file's basename. If there is only one, and
1100 if the main source file doesn't have any symbol or line number
1101 information, then copy this file's symtab and line_vector to the
1102 main source file's subfile and discard the other subfile. This can
1103 happen because of a compiler bug or from the user playing games
1104 with #line or from things like a distributed build system that
1105 manipulates the debug info. This can also happen from an innocent
1106 symlink in the paths, we don't canonicalize paths here. */
1109 watch_main_source_file_lossage (void)
1111 struct subfile *mainsub, *subfile;
1113 /* We have to watch for buildsym_compunit == NULL here. It's a quirk of
1114 end_symtab, it can return NULL so there may not be a main subfile. */
1115 if (buildsym_compunit == NULL)
1118 /* Get the main source file. */
1119 mainsub = buildsym_compunit->main_subfile;
1121 /* If the main source file doesn't have any line number or symbol
1122 info, look for an alias in another subfile. */
1124 if (mainsub->line_vector == NULL
1125 && mainsub->symtab == NULL)
1127 const char *mainbase = lbasename (mainsub->name);
1129 struct subfile *prevsub;
1130 struct subfile *mainsub_alias = NULL;
1131 struct subfile *prev_mainsub_alias = NULL;
1134 for (subfile = buildsym_compunit->subfiles;
1136 subfile = subfile->next)
1138 if (subfile == mainsub)
1140 if (filename_cmp (lbasename (subfile->name), mainbase) == 0)
1143 mainsub_alias = subfile;
1144 prev_mainsub_alias = prevsub;
1149 if (nr_matches == 1)
1151 gdb_assert (mainsub_alias != NULL && mainsub_alias != mainsub);
1153 /* Found a match for the main source file.
1154 Copy its line_vector and symtab to the main subfile
1155 and then discard it. */
1157 mainsub->line_vector = mainsub_alias->line_vector;
1158 mainsub->line_vector_length = mainsub_alias->line_vector_length;
1159 mainsub->symtab = mainsub_alias->symtab;
1161 if (prev_mainsub_alias == NULL)
1162 buildsym_compunit->subfiles = mainsub_alias->next;
1164 prev_mainsub_alias->next = mainsub_alias->next;
1165 xfree (mainsub_alias->name);
1166 xfree (mainsub_alias);
1171 /* Reset state after a successful building of a symtab.
1172 This exists because dbxread.c and xcoffread.c can call
1173 start_symtab+end_symtab multiple times after one call to buildsym_init,
1174 and before the scoped_free_pendings destructor is called.
1175 We keep the free_pendings list around for dbx/xcoff sake. */
1178 reset_symtab_globals (void)
1180 set_last_source_file (NULL);
1182 local_symbols = NULL;
1183 local_using_directives = NULL;
1184 file_symbols = NULL;
1185 global_symbols = NULL;
1186 global_using_directives = NULL;
1188 /* We don't free pending_macros here because if the symtab was successfully
1189 built then ownership was transferred to the symtab. */
1190 pending_macros = NULL;
1192 if (pending_addrmap)
1193 obstack_free (&pending_addrmap_obstack, NULL);
1194 pending_addrmap = NULL;
1196 free_buildsym_compunit ();
1199 /* Implementation of the first part of end_symtab. It allows modifying
1200 STATIC_BLOCK before it gets finalized by end_symtab_from_static_block.
1201 If the returned value is NULL there is no blockvector created for
1202 this symtab (you still must call end_symtab_from_static_block).
1204 END_ADDR is the same as for end_symtab: the address of the end of the
1207 If EXPANDABLE is non-zero the STATIC_BLOCK dictionary is made
1210 If REQUIRED is non-zero, then a symtab is created even if it does
1211 not contain any symbols. */
1214 end_symtab_get_static_block (CORE_ADDR end_addr, int expandable, int required)
1216 struct objfile *objfile = buildsym_compunit->objfile;
1218 /* Finish the lexical context of the last function in the file; pop
1219 the context stack. */
1221 if (context_stack_depth > 0)
1223 struct context_stack *cstk = pop_context ();
1225 /* Make a block for the local symbols within. */
1226 finish_block (cstk->name, &local_symbols, cstk->old_blocks, NULL,
1227 cstk->start_addr, end_addr);
1229 if (context_stack_depth > 0)
1231 /* This is said to happen with SCO. The old coffread.c
1232 code simply emptied the context stack, so we do the
1233 same. FIXME: Find out why it is happening. This is not
1234 believed to happen in most cases (even for coffread.c);
1235 it used to be an abort(). */
1236 complaint (_("Context stack not empty in end_symtab"));
1237 context_stack_depth = 0;
1241 /* Reordered executables may have out of order pending blocks; if
1242 OBJF_REORDERED is true, then sort the pending blocks. */
1244 if ((objfile->flags & OBJF_REORDERED) && pending_blocks)
1246 struct pending_block *pb;
1248 std::vector<block *> barray;
1250 for (pb = pending_blocks; pb != NULL; pb = pb->next)
1251 barray.push_back (pb->block);
1253 /* Sort blocks by start address in descending order. Blocks with the
1254 same start address must remain in the original order to preserve
1255 inline function caller/callee relationships. */
1256 std::stable_sort (barray.begin (), barray.end (),
1257 [] (const block *a, const block *b)
1259 return BLOCK_START (a) > BLOCK_START (b);
1263 for (pb = pending_blocks; pb != NULL; pb = pb->next)
1264 pb->block = barray[i++];
1267 /* Cleanup any undefined types that have been left hanging around
1268 (this needs to be done before the finish_blocks so that
1269 file_symbols is still good).
1271 Both cleanup_undefined_stabs_types and finish_global_stabs are stabs
1272 specific, but harmless for other symbol readers, since on gdb
1273 startup or when finished reading stabs, the state is set so these
1274 are no-ops. FIXME: Is this handled right in case of QUIT? Can
1275 we make this cleaner? */
1277 cleanup_undefined_stabs_types (objfile);
1278 finish_global_stabs (objfile);
1281 && pending_blocks == NULL
1282 && file_symbols == NULL
1283 && global_symbols == NULL
1284 && have_line_numbers == 0
1285 && pending_macros == NULL
1286 && global_using_directives == NULL)
1288 /* Ignore symtabs that have no functions with real debugging info. */
1293 /* Define the STATIC_BLOCK. */
1294 return finish_block_internal (NULL, &file_symbols, NULL, NULL,
1295 last_source_start_addr, end_addr,
1300 /* Subroutine of end_symtab_from_static_block to simplify it.
1301 Handle the "have blockvector" case.
1302 See end_symtab_from_static_block for a description of the arguments. */
1304 static struct compunit_symtab *
1305 end_symtab_with_blockvector (struct block *static_block,
1306 int section, int expandable)
1308 struct objfile *objfile = buildsym_compunit->objfile;
1309 struct compunit_symtab *cu = buildsym_compunit->compunit_symtab;
1310 struct symtab *symtab;
1311 struct blockvector *blockvector;
1312 struct subfile *subfile;
1315 gdb_assert (static_block != NULL);
1316 gdb_assert (buildsym_compunit != NULL);
1317 gdb_assert (buildsym_compunit->subfiles != NULL);
1319 end_addr = BLOCK_END (static_block);
1321 /* Create the GLOBAL_BLOCK and build the blockvector. */
1322 finish_block_internal (NULL, &global_symbols, NULL, NULL,
1323 last_source_start_addr, end_addr,
1325 blockvector = make_blockvector ();
1327 /* Read the line table if it has to be read separately.
1328 This is only used by xcoffread.c. */
1329 if (objfile->sf->sym_read_linetable != NULL)
1330 objfile->sf->sym_read_linetable (objfile);
1332 /* Handle the case where the debug info specifies a different path
1333 for the main source file. It can cause us to lose track of its
1334 line number information. */
1335 watch_main_source_file_lossage ();
1337 /* Now create the symtab objects proper, if not already done,
1338 one for each subfile. */
1340 for (subfile = buildsym_compunit->subfiles;
1342 subfile = subfile->next)
1344 int linetablesize = 0;
1346 if (subfile->line_vector)
1348 linetablesize = sizeof (struct linetable) +
1349 subfile->line_vector->nitems * sizeof (struct linetable_entry);
1351 /* Like the pending blocks, the line table may be
1352 scrambled in reordered executables. Sort it if
1353 OBJF_REORDERED is true. */
1354 if (objfile->flags & OBJF_REORDERED)
1355 qsort (subfile->line_vector->item,
1356 subfile->line_vector->nitems,
1357 sizeof (struct linetable_entry), compare_line_numbers);
1360 /* Allocate a symbol table if necessary. */
1361 if (subfile->symtab == NULL)
1362 subfile->symtab = allocate_symtab (cu, subfile->name);
1363 symtab = subfile->symtab;
1365 /* Fill in its components. */
1367 if (subfile->line_vector)
1369 /* Reallocate the line table on the symbol obstack. */
1370 SYMTAB_LINETABLE (symtab) = (struct linetable *)
1371 obstack_alloc (&objfile->objfile_obstack, linetablesize);
1372 memcpy (SYMTAB_LINETABLE (symtab), subfile->line_vector,
1377 SYMTAB_LINETABLE (symtab) = NULL;
1380 /* Use whatever language we have been using for this
1381 subfile, not the one that was deduced in allocate_symtab
1382 from the filename. We already did our own deducing when
1383 we created the subfile, and we may have altered our
1384 opinion of what language it is from things we found in
1386 symtab->language = subfile->language;
1389 /* Make sure the symtab of main_subfile is the first in its list. */
1391 struct symtab *main_symtab, *prev_symtab;
1393 main_symtab = buildsym_compunit->main_subfile->symtab;
1395 ALL_COMPUNIT_FILETABS (cu, symtab)
1397 if (symtab == main_symtab)
1399 if (prev_symtab != NULL)
1401 prev_symtab->next = main_symtab->next;
1402 main_symtab->next = COMPUNIT_FILETABS (cu);
1403 COMPUNIT_FILETABS (cu) = main_symtab;
1407 prev_symtab = symtab;
1409 gdb_assert (main_symtab == COMPUNIT_FILETABS (cu));
1412 /* Fill out the compunit symtab. */
1414 if (buildsym_compunit->comp_dir != NULL)
1416 /* Reallocate the dirname on the symbol obstack. */
1417 COMPUNIT_DIRNAME (cu)
1418 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
1419 buildsym_compunit->comp_dir,
1420 strlen (buildsym_compunit->comp_dir));
1423 /* Save the debug format string (if any) in the symtab. */
1424 COMPUNIT_DEBUGFORMAT (cu) = buildsym_compunit->debugformat;
1426 /* Similarly for the producer. */
1427 COMPUNIT_PRODUCER (cu) = buildsym_compunit->producer;
1429 COMPUNIT_BLOCKVECTOR (cu) = blockvector;
1431 struct block *b = BLOCKVECTOR_BLOCK (blockvector, GLOBAL_BLOCK);
1433 set_block_compunit_symtab (b, cu);
1436 COMPUNIT_BLOCK_LINE_SECTION (cu) = section;
1438 COMPUNIT_MACRO_TABLE (cu) = pending_macros;
1440 /* Default any symbols without a specified symtab to the primary symtab. */
1444 /* The main source file's symtab. */
1445 symtab = COMPUNIT_FILETABS (cu);
1447 for (block_i = 0; block_i < BLOCKVECTOR_NBLOCKS (blockvector); block_i++)
1449 struct block *block = BLOCKVECTOR_BLOCK (blockvector, block_i);
1451 struct dict_iterator iter;
1453 /* Inlined functions may have symbols not in the global or
1454 static symbol lists. */
1455 if (BLOCK_FUNCTION (block) != NULL)
1456 if (symbol_symtab (BLOCK_FUNCTION (block)) == NULL)
1457 symbol_set_symtab (BLOCK_FUNCTION (block), symtab);
1459 /* Note that we only want to fix up symbols from the local
1460 blocks, not blocks coming from included symtabs. That is why
1461 we use ALL_DICT_SYMBOLS here and not ALL_BLOCK_SYMBOLS. */
1462 ALL_DICT_SYMBOLS (BLOCK_DICT (block), iter, sym)
1463 if (symbol_symtab (sym) == NULL)
1464 symbol_set_symtab (sym, symtab);
1468 add_compunit_symtab_to_objfile (cu);
1473 /* Implementation of the second part of end_symtab. Pass STATIC_BLOCK
1474 as value returned by end_symtab_get_static_block.
1476 SECTION is the same as for end_symtab: the section number
1477 (in objfile->section_offsets) of the blockvector and linetable.
1479 If EXPANDABLE is non-zero the GLOBAL_BLOCK dictionary is made
1482 struct compunit_symtab *
1483 end_symtab_from_static_block (struct block *static_block,
1484 int section, int expandable)
1486 struct compunit_symtab *cu;
1488 if (static_block == NULL)
1490 /* Handle the "no blockvector" case.
1491 When this happens there is nothing to record, so there's nothing
1492 to do: memory will be freed up later.
1494 Note: We won't be adding a compunit to the objfile's list of
1495 compunits, so there's nothing to unchain. However, since each symtab
1496 is added to the objfile's obstack we can't free that space.
1497 We could do better, but this is believed to be a sufficiently rare
1502 cu = end_symtab_with_blockvector (static_block, section, expandable);
1504 reset_symtab_globals ();
1509 /* Finish the symbol definitions for one main source file, close off
1510 all the lexical contexts for that file (creating struct block's for
1511 them), then make the struct symtab for that file and put it in the
1514 END_ADDR is the address of the end of the file's text. SECTION is
1515 the section number (in objfile->section_offsets) of the blockvector
1518 Note that it is possible for end_symtab() to return NULL. In
1519 particular, for the DWARF case at least, it will return NULL when
1520 it finds a compilation unit that has exactly one DIE, a
1521 TAG_compile_unit DIE. This can happen when we link in an object
1522 file that was compiled from an empty source file. Returning NULL
1523 is probably not the correct thing to do, because then gdb will
1524 never know about this empty file (FIXME).
1526 If you need to modify STATIC_BLOCK before it is finalized you should
1527 call end_symtab_get_static_block and end_symtab_from_static_block
1530 struct compunit_symtab *
1531 end_symtab (CORE_ADDR end_addr, int section)
1533 struct block *static_block;
1535 static_block = end_symtab_get_static_block (end_addr, 0, 0);
1536 return end_symtab_from_static_block (static_block, section, 0);
1539 /* Same as end_symtab except create a symtab that can be later added to. */
1541 struct compunit_symtab *
1542 end_expandable_symtab (CORE_ADDR end_addr, int section)
1544 struct block *static_block;
1546 static_block = end_symtab_get_static_block (end_addr, 1, 0);
1547 return end_symtab_from_static_block (static_block, section, 1);
1550 /* Subroutine of augment_type_symtab to simplify it.
1551 Attach the main source file's symtab to all symbols in PENDING_LIST that
1555 set_missing_symtab (struct pending *pending_list,
1556 struct compunit_symtab *cu)
1558 struct pending *pending;
1561 for (pending = pending_list; pending != NULL; pending = pending->next)
1563 for (i = 0; i < pending->nsyms; ++i)
1565 if (symbol_symtab (pending->symbol[i]) == NULL)
1566 symbol_set_symtab (pending->symbol[i], COMPUNIT_FILETABS (cu));
1571 /* Same as end_symtab, but for the case where we're adding more symbols
1572 to an existing symtab that is known to contain only type information.
1573 This is the case for DWARF4 Type Units. */
1576 augment_type_symtab (void)
1578 struct compunit_symtab *cust = buildsym_compunit->compunit_symtab;
1579 const struct blockvector *blockvector = COMPUNIT_BLOCKVECTOR (cust);
1581 if (context_stack_depth > 0)
1583 complaint (_("Context stack not empty in augment_type_symtab"));
1584 context_stack_depth = 0;
1586 if (pending_blocks != NULL)
1587 complaint (_("Blocks in a type symtab"));
1588 if (pending_macros != NULL)
1589 complaint (_("Macro in a type symtab"));
1590 if (have_line_numbers)
1591 complaint (_("Line numbers recorded in a type symtab"));
1593 if (file_symbols != NULL)
1595 struct block *block = BLOCKVECTOR_BLOCK (blockvector, STATIC_BLOCK);
1597 /* First mark any symbols without a specified symtab as belonging
1598 to the primary symtab. */
1599 set_missing_symtab (file_symbols, cust);
1601 dict_add_pending (BLOCK_DICT (block), file_symbols);
1604 if (global_symbols != NULL)
1606 struct block *block = BLOCKVECTOR_BLOCK (blockvector, GLOBAL_BLOCK);
1608 /* First mark any symbols without a specified symtab as belonging
1609 to the primary symtab. */
1610 set_missing_symtab (global_symbols, cust);
1612 dict_add_pending (BLOCK_DICT (block), global_symbols);
1615 reset_symtab_globals ();
1618 /* Push a context block. Args are an identifying nesting level
1619 (checkable when you pop it), and the starting PC address of this
1622 struct context_stack *
1623 push_context (int desc, CORE_ADDR valu)
1625 struct context_stack *newobj;
1627 if (context_stack_depth == context_stack_size)
1629 context_stack_size *= 2;
1630 context_stack = (struct context_stack *)
1631 xrealloc ((char *) context_stack,
1632 (context_stack_size * sizeof (struct context_stack)));
1635 newobj = &context_stack[context_stack_depth++];
1636 newobj->depth = desc;
1637 newobj->locals = local_symbols;
1638 newobj->old_blocks = pending_blocks;
1639 newobj->start_addr = valu;
1640 newobj->local_using_directives = local_using_directives;
1641 newobj->name = NULL;
1643 local_symbols = NULL;
1644 local_using_directives = NULL;
1649 /* Pop a context block. Returns the address of the context block just
1652 struct context_stack *
1655 gdb_assert (context_stack_depth > 0);
1656 return (&context_stack[--context_stack_depth]);
1661 /* Compute a small integer hash code for the given name. */
1664 hashname (const char *name)
1666 return (hash(name,strlen(name)) % HASHSIZE);
1671 record_debugformat (const char *format)
1673 buildsym_compunit->debugformat = format;
1677 record_producer (const char *producer)
1679 buildsym_compunit->producer = producer;
1682 /* Merge the first symbol list SRCLIST into the second symbol list
1683 TARGETLIST by repeated calls to add_symbol_to_list(). This
1684 procedure "frees" each link of SRCLIST by adding it to the
1685 free_pendings list. Caller must set SRCLIST to a null list after
1686 calling this function.
1691 merge_symbol_lists (struct pending **srclist, struct pending **targetlist)
1695 if (!srclist || !*srclist)
1698 /* Merge in elements from current link. */
1699 for (i = 0; i < (*srclist)->nsyms; i++)
1700 add_symbol_to_list ((*srclist)->symbol[i], targetlist);
1702 /* Recurse on next. */
1703 merge_symbol_lists (&(*srclist)->next, targetlist);
1705 /* "Free" the current link. */
1706 (*srclist)->next = free_pendings;
1707 free_pendings = (*srclist);
1711 /* Name of source file whose symbol data we are now processing. This
1712 comes from a symbol of type N_SO for stabs. For Dwarf it comes
1713 from the DW_AT_name attribute of a DW_TAG_compile_unit DIE. */
1715 static char *last_source_file;
1717 /* See buildsym.h. */
1720 set_last_source_file (const char *name)
1722 xfree (last_source_file);
1723 last_source_file = name == NULL ? NULL : xstrdup (name);
1726 /* See buildsym.h. */
1729 get_last_source_file (void)
1731 return last_source_file;
1736 /* Initialize anything that needs initializing when starting to read a
1737 fresh piece of a symbol file, e.g. reading in the stuff
1738 corresponding to a psymtab. */
1741 buildsym_init (void)
1743 subfile_stack = NULL;
1745 pending_addrmap_interesting = 0;
1747 /* Context stack is initially empty. Allocate first one with room
1748 for a few levels; reuse it forever afterward. */
1749 if (context_stack == NULL)
1751 context_stack_size = INITIAL_CONTEXT_STACK_SIZE;
1752 context_stack = XNEWVEC (struct context_stack, context_stack_size);
1755 /* Ensure the scoped_free_pendings destructor was called after
1757 gdb_assert (free_pendings == NULL);
1758 gdb_assert (pending_blocks == NULL);
1759 gdb_assert (file_symbols == NULL);
1760 gdb_assert (global_symbols == NULL);
1761 gdb_assert (global_using_directives == NULL);
1762 gdb_assert (pending_macros == NULL);
1763 gdb_assert (pending_addrmap == NULL);
1764 gdb_assert (buildsym_compunit == NULL);
1767 /* Initialize anything that needs initializing when a completely new
1768 symbol file is specified (not just adding some symbols from another
1769 file, e.g. a shared library). */
1772 buildsym_new_init (void)