1206 lines
35 KiB
C
1206 lines
35 KiB
C
/* Support routines for building symbol tables in GDB's internal format.
|
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Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
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1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007
|
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Free Software Foundation, Inc.
|
||
|
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This file is part of GDB.
|
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|
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
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||
|
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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||
GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This module provides subroutines used for creating and adding to
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the symbol table. These routines are called from various symbol-
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file-reading routines.
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Routines to support specific debugging information formats (stabs,
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DWARF, etc) belong somewhere else. */
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#include "defs.h"
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#include "bfd.h"
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#include "gdb_obstack.h"
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#include "symtab.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "gdbtypes.h"
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#include "gdb_assert.h"
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#include "complaints.h"
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#include "gdb_string.h"
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#include "expression.h" /* For "enum exp_opcode" used by... */
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#include "bcache.h"
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#include "filenames.h" /* For DOSish file names */
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#include "macrotab.h"
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#include "demangle.h" /* Needed by SYMBOL_INIT_DEMANGLED_NAME. */
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#include "block.h"
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#include "cp-support.h"
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#include "dictionary.h"
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/* Ask buildsym.h to define the vars it normally declares `extern'. */
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#define EXTERN
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/**/
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#include "buildsym.h" /* Our own declarations */
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#undef EXTERN
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/* For cleanup_undefined_types and finish_global_stabs (somewhat
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questionable--see comment where we call them). */
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#include "stabsread.h"
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/* List of free `struct pending' structures for reuse. */
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static struct pending *free_pendings;
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/* Non-zero if symtab has line number info. This prevents an
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otherwise empty symtab from being tossed. */
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static int have_line_numbers;
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static int compare_line_numbers (const void *ln1p, const void *ln2p);
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/* Initial sizes of data structures. These are realloc'd larger if
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needed, and realloc'd down to the size actually used, when
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completed. */
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#define INITIAL_CONTEXT_STACK_SIZE 10
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#define INITIAL_LINE_VECTOR_LENGTH 1000
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/* maintain the lists of symbols and blocks */
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/* Add a pending list to free_pendings. */
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void
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add_free_pendings (struct pending *list)
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{
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struct pending *link = list;
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if (list)
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{
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while (link->next) link = link->next;
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link->next = free_pendings;
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free_pendings = list;
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}
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}
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/* Add a symbol to one of the lists of symbols. While we're at it, if
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we're in the C++ case and don't have full namespace debugging info,
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check to see if it references an anonymous namespace; if so, add an
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appropriate using directive. */
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void
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add_symbol_to_list (struct symbol *symbol, struct pending **listhead)
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{
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struct pending *link;
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/* If this is an alias for another symbol, don't add it. */
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if (symbol->ginfo.name && symbol->ginfo.name[0] == '#')
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return;
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/* We keep PENDINGSIZE symbols in each link of the list. If we
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don't have a link with room in it, add a new link. */
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if (*listhead == NULL || (*listhead)->nsyms == PENDINGSIZE)
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{
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if (free_pendings)
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{
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link = free_pendings;
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free_pendings = link->next;
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}
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else
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{
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link = (struct pending *) xmalloc (sizeof (struct pending));
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}
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link->next = *listhead;
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*listhead = link;
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link->nsyms = 0;
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}
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(*listhead)->symbol[(*listhead)->nsyms++] = symbol;
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/* Check to see if we might need to look for a mention of anonymous
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namespaces. */
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if (SYMBOL_LANGUAGE (symbol) == language_cplus)
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cp_scan_for_anonymous_namespaces (symbol);
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}
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/* Find a symbol named NAME on a LIST. NAME need not be
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'\0'-terminated; LENGTH is the length of the name. */
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struct symbol *
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find_symbol_in_list (struct pending *list, char *name, int length)
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{
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int j;
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char *pp;
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||
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while (list != NULL)
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{
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for (j = list->nsyms; --j >= 0;)
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{
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pp = DEPRECATED_SYMBOL_NAME (list->symbol[j]);
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if (*pp == *name && strncmp (pp, name, length) == 0 &&
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pp[length] == '\0')
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{
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return (list->symbol[j]);
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}
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}
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list = list->next;
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}
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return (NULL);
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}
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/* At end of reading syms, or in case of quit, really free as many
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`struct pending's as we can easily find. */
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void
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really_free_pendings (void *dummy)
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||
{
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struct pending *next, *next1;
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for (next = free_pendings; next; next = next1)
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{
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next1 = next->next;
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xfree ((void *) next);
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}
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free_pendings = NULL;
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free_pending_blocks ();
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for (next = file_symbols; next != NULL; next = next1)
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{
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next1 = next->next;
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xfree ((void *) next);
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}
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file_symbols = NULL;
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for (next = global_symbols; next != NULL; next = next1)
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{
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next1 = next->next;
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xfree ((void *) next);
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}
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global_symbols = NULL;
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if (pending_macros)
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free_macro_table (pending_macros);
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}
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/* This function is called to discard any pending blocks. */
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void
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free_pending_blocks (void)
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{
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/* The links are made in the objfile_obstack, so we only need to
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reset PENDING_BLOCKS. */
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pending_blocks = NULL;
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}
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/* Take one of the lists of symbols and make a block from it. Keep
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the order the symbols have in the list (reversed from the input
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file). Put the block on the list of pending blocks. */
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void
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finish_block (struct symbol *symbol, struct pending **listhead,
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struct pending_block *old_blocks,
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CORE_ADDR start, CORE_ADDR end,
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struct objfile *objfile)
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{
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struct pending *next, *next1;
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struct block *block;
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struct pending_block *pblock;
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struct pending_block *opblock;
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block = allocate_block (&objfile->objfile_obstack);
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||
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if (symbol)
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{
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BLOCK_DICT (block) = dict_create_linear (&objfile->objfile_obstack,
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*listhead);
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||
}
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else
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{
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BLOCK_DICT (block) = dict_create_hashed (&objfile->objfile_obstack,
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*listhead);
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}
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BLOCK_START (block) = start;
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BLOCK_END (block) = end;
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/* Superblock filled in when containing block is made */
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BLOCK_SUPERBLOCK (block) = NULL;
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BLOCK_NAMESPACE (block) = NULL;
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/* Put the block in as the value of the symbol that names it. */
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if (symbol)
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{
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struct type *ftype = SYMBOL_TYPE (symbol);
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struct dict_iterator iter;
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SYMBOL_BLOCK_VALUE (symbol) = block;
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BLOCK_FUNCTION (block) = symbol;
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if (TYPE_NFIELDS (ftype) <= 0)
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{
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/* No parameter type information is recorded with the
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function's type. Set that from the type of the
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parameter symbols. */
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int nparams = 0, iparams;
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struct symbol *sym;
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ALL_BLOCK_SYMBOLS (block, iter, sym)
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{
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switch (SYMBOL_CLASS (sym))
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{
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case LOC_ARG:
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case LOC_REF_ARG:
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case LOC_REGPARM:
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case LOC_REGPARM_ADDR:
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case LOC_BASEREG_ARG:
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case LOC_LOCAL_ARG:
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case LOC_COMPUTED_ARG:
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nparams++;
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break;
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case LOC_UNDEF:
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case LOC_CONST:
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case LOC_STATIC:
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case LOC_INDIRECT:
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case LOC_REGISTER:
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case LOC_LOCAL:
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case LOC_TYPEDEF:
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case LOC_LABEL:
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case LOC_BLOCK:
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case LOC_CONST_BYTES:
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case LOC_BASEREG:
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case LOC_UNRESOLVED:
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case LOC_OPTIMIZED_OUT:
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case LOC_COMPUTED:
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default:
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break;
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}
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}
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if (nparams > 0)
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{
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TYPE_NFIELDS (ftype) = nparams;
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TYPE_FIELDS (ftype) = (struct field *)
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TYPE_ALLOC (ftype, nparams * sizeof (struct field));
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iparams = 0;
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ALL_BLOCK_SYMBOLS (block, iter, sym)
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{
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if (iparams == nparams)
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break;
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switch (SYMBOL_CLASS (sym))
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{
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case LOC_ARG:
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case LOC_REF_ARG:
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case LOC_REGPARM:
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case LOC_REGPARM_ADDR:
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case LOC_BASEREG_ARG:
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case LOC_LOCAL_ARG:
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case LOC_COMPUTED_ARG:
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TYPE_FIELD_TYPE (ftype, iparams) = SYMBOL_TYPE (sym);
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TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
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iparams++;
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break;
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case LOC_UNDEF:
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case LOC_CONST:
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case LOC_STATIC:
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case LOC_INDIRECT:
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case LOC_REGISTER:
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case LOC_LOCAL:
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case LOC_TYPEDEF:
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case LOC_LABEL:
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case LOC_BLOCK:
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case LOC_CONST_BYTES:
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case LOC_BASEREG:
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case LOC_UNRESOLVED:
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case LOC_OPTIMIZED_OUT:
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||
case LOC_COMPUTED:
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default:
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break;
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}
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}
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}
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}
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/* If we're in the C++ case, set the block's scope. */
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if (SYMBOL_LANGUAGE (symbol) == language_cplus)
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{
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cp_set_block_scope (symbol, block, &objfile->objfile_obstack);
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}
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}
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else
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{
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BLOCK_FUNCTION (block) = NULL;
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}
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||
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/* Now "free" the links of the list, and empty the list. */
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||
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for (next = *listhead; next; next = next1)
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{
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next1 = next->next;
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next->next = free_pendings;
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free_pendings = next;
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||
}
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*listhead = NULL;
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||
|
||
/* Check to be sure that the blocks have an end address that is
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||
greater than starting address */
|
||
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if (BLOCK_END (block) < BLOCK_START (block))
|
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{
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||
if (symbol)
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||
{
|
||
complaint (&symfile_complaints,
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_("block end address less than block start address in %s (patched it)"),
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SYMBOL_PRINT_NAME (symbol));
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}
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||
else
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{
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complaint (&symfile_complaints,
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_("block end address 0x%s less than block start address 0x%s (patched it)"),
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paddr_nz (BLOCK_END (block)), paddr_nz (BLOCK_START (block)));
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||
}
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||
/* Better than nothing */
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||
BLOCK_END (block) = BLOCK_START (block);
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||
}
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||
|
||
/* Install this block as the superblock of all blocks made since the
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||
start of this scope that don't have superblocks yet. */
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||
|
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opblock = NULL;
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||
for (pblock = pending_blocks;
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pblock && pblock != old_blocks;
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||
pblock = pblock->next)
|
||
{
|
||
if (BLOCK_SUPERBLOCK (pblock->block) == NULL)
|
||
{
|
||
/* Check to be sure the blocks are nested as we receive
|
||
them. If the compiler/assembler/linker work, this just
|
||
burns a small amount of time.
|
||
|
||
Skip blocks which correspond to a function; they're not
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physically nested inside this other blocks, only
|
||
lexically nested. */
|
||
if (BLOCK_FUNCTION (pblock->block) == NULL
|
||
&& (BLOCK_START (pblock->block) < BLOCK_START (block)
|
||
|| BLOCK_END (pblock->block) > BLOCK_END (block)))
|
||
{
|
||
if (symbol)
|
||
{
|
||
complaint (&symfile_complaints,
|
||
_("inner block not inside outer block in %s"),
|
||
SYMBOL_PRINT_NAME (symbol));
|
||
}
|
||
else
|
||
{
|
||
complaint (&symfile_complaints,
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||
_("inner block (0x%s-0x%s) not inside outer block (0x%s-0x%s)"),
|
||
paddr_nz (BLOCK_START (pblock->block)),
|
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paddr_nz (BLOCK_END (pblock->block)),
|
||
paddr_nz (BLOCK_START (block)),
|
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paddr_nz (BLOCK_END (block)));
|
||
}
|
||
if (BLOCK_START (pblock->block) < BLOCK_START (block))
|
||
BLOCK_START (pblock->block) = BLOCK_START (block);
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||
if (BLOCK_END (pblock->block) > BLOCK_END (block))
|
||
BLOCK_END (pblock->block) = BLOCK_END (block);
|
||
}
|
||
BLOCK_SUPERBLOCK (pblock->block) = block;
|
||
}
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||
opblock = pblock;
|
||
}
|
||
|
||
record_pending_block (objfile, block, opblock);
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||
}
|
||
|
||
|
||
/* Record BLOCK on the list of all blocks in the file. Put it after
|
||
OPBLOCK, or at the beginning if opblock is NULL. This puts the
|
||
block in the list after all its subblocks.
|
||
|
||
Allocate the pending block struct in the objfile_obstack to save
|
||
time. This wastes a little space. FIXME: Is it worth it? */
|
||
|
||
void
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||
record_pending_block (struct objfile *objfile, struct block *block,
|
||
struct pending_block *opblock)
|
||
{
|
||
struct pending_block *pblock;
|
||
|
||
pblock = (struct pending_block *)
|
||
obstack_alloc (&objfile->objfile_obstack, sizeof (struct pending_block));
|
||
pblock->block = block;
|
||
if (opblock)
|
||
{
|
||
pblock->next = opblock->next;
|
||
opblock->next = pblock;
|
||
}
|
||
else
|
||
{
|
||
pblock->next = pending_blocks;
|
||
pending_blocks = pblock;
|
||
}
|
||
}
|
||
|
||
static struct blockvector *
|
||
make_blockvector (struct objfile *objfile)
|
||
{
|
||
struct pending_block *next;
|
||
struct blockvector *blockvector;
|
||
int i;
|
||
|
||
/* Count the length of the list of blocks. */
|
||
|
||
for (next = pending_blocks, i = 0; next; next = next->next, i++)
|
||
{;
|
||
}
|
||
|
||
blockvector = (struct blockvector *)
|
||
obstack_alloc (&objfile->objfile_obstack,
|
||
(sizeof (struct blockvector)
|
||
+ (i - 1) * sizeof (struct block *)));
|
||
|
||
/* Copy the blocks into the blockvector. This is done in reverse
|
||
order, which happens to put the blocks into the proper order
|
||
(ascending starting address). finish_block has hair to insert
|
||
each block into the list after its subblocks in order to make
|
||
sure this is true. */
|
||
|
||
BLOCKVECTOR_NBLOCKS (blockvector) = i;
|
||
for (next = pending_blocks; next; next = next->next)
|
||
{
|
||
BLOCKVECTOR_BLOCK (blockvector, --i) = next->block;
|
||
}
|
||
|
||
free_pending_blocks ();
|
||
|
||
/* Some compilers output blocks in the wrong order, but we depend on
|
||
their being in the right order so we can binary search. Check the
|
||
order and moan about it. */
|
||
if (BLOCKVECTOR_NBLOCKS (blockvector) > 1)
|
||
{
|
||
for (i = 1; i < BLOCKVECTOR_NBLOCKS (blockvector); i++)
|
||
{
|
||
if (BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i - 1))
|
||
> BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i)))
|
||
{
|
||
CORE_ADDR start
|
||
= BLOCK_START (BLOCKVECTOR_BLOCK (blockvector, i));
|
||
|
||
complaint (&symfile_complaints, _("block at %s out of order"),
|
||
hex_string ((LONGEST) start));
|
||
}
|
||
}
|
||
}
|
||
|
||
return (blockvector);
|
||
}
|
||
|
||
/* Start recording information about source code that came from an
|
||
included (or otherwise merged-in) source file with a different
|
||
name. NAME is the name of the file (cannot be NULL), DIRNAME is
|
||
the directory in which the file was compiled (or NULL if not known). */
|
||
|
||
void
|
||
start_subfile (char *name, char *dirname)
|
||
{
|
||
struct subfile *subfile;
|
||
|
||
/* See if this subfile is already known as a subfile of the current
|
||
main source file. */
|
||
|
||
for (subfile = subfiles; subfile; subfile = subfile->next)
|
||
{
|
||
char *subfile_name;
|
||
|
||
/* If NAME is an absolute path, and this subfile is not, then
|
||
attempt to create an absolute path to compare. */
|
||
if (IS_ABSOLUTE_PATH (name)
|
||
&& !IS_ABSOLUTE_PATH (subfile->name)
|
||
&& subfile->dirname != NULL)
|
||
subfile_name = concat (subfile->dirname, SLASH_STRING,
|
||
subfile->name, NULL);
|
||
else
|
||
subfile_name = subfile->name;
|
||
|
||
if (FILENAME_CMP (subfile_name, name) == 0)
|
||
{
|
||
current_subfile = subfile;
|
||
if (subfile_name != subfile->name)
|
||
xfree (subfile_name);
|
||
return;
|
||
}
|
||
if (subfile_name != subfile->name)
|
||
xfree (subfile_name);
|
||
}
|
||
|
||
/* This subfile is not known. Add an entry for it. Make an entry
|
||
for this subfile in the list of all subfiles of the current main
|
||
source file. */
|
||
|
||
subfile = (struct subfile *) xmalloc (sizeof (struct subfile));
|
||
memset ((char *) subfile, 0, sizeof (struct subfile));
|
||
subfile->next = subfiles;
|
||
subfiles = subfile;
|
||
current_subfile = subfile;
|
||
|
||
/* Save its name and compilation directory name */
|
||
subfile->name = (name == NULL) ? NULL : savestring (name, strlen (name));
|
||
subfile->dirname =
|
||
(dirname == NULL) ? NULL : savestring (dirname, strlen (dirname));
|
||
|
||
/* Initialize line-number recording for this subfile. */
|
||
subfile->line_vector = NULL;
|
||
|
||
/* Default the source language to whatever can be deduced from the
|
||
filename. If nothing can be deduced (such as for a C/C++ include
|
||
file with a ".h" extension), then inherit whatever language the
|
||
previous subfile had. This kludgery is necessary because there
|
||
is no standard way in some object formats to record the source
|
||
language. Also, when symtabs are allocated we try to deduce a
|
||
language then as well, but it is too late for us to use that
|
||
information while reading symbols, since symtabs aren't allocated
|
||
until after all the symbols have been processed for a given
|
||
source file. */
|
||
|
||
subfile->language = deduce_language_from_filename (subfile->name);
|
||
if (subfile->language == language_unknown &&
|
||
subfile->next != NULL)
|
||
{
|
||
subfile->language = subfile->next->language;
|
||
}
|
||
|
||
/* Initialize the debug format string to NULL. We may supply it
|
||
later via a call to record_debugformat. */
|
||
subfile->debugformat = NULL;
|
||
|
||
/* Similarly for the producer. */
|
||
subfile->producer = NULL;
|
||
|
||
/* If the filename of this subfile ends in .C, then change the
|
||
language of any pending subfiles from C to C++. We also accept
|
||
any other C++ suffixes accepted by deduce_language_from_filename. */
|
||
/* Likewise for f2c. */
|
||
|
||
if (subfile->name)
|
||
{
|
||
struct subfile *s;
|
||
enum language sublang = deduce_language_from_filename (subfile->name);
|
||
|
||
if (sublang == language_cplus || sublang == language_fortran)
|
||
for (s = subfiles; s != NULL; s = s->next)
|
||
if (s->language == language_c)
|
||
s->language = sublang;
|
||
}
|
||
|
||
/* And patch up this file if necessary. */
|
||
if (subfile->language == language_c
|
||
&& subfile->next != NULL
|
||
&& (subfile->next->language == language_cplus
|
||
|| subfile->next->language == language_fortran))
|
||
{
|
||
subfile->language = subfile->next->language;
|
||
}
|
||
}
|
||
|
||
/* For stabs readers, the first N_SO symbol is assumed to be the
|
||
source file name, and the subfile struct is initialized using that
|
||
assumption. If another N_SO symbol is later seen, immediately
|
||
following the first one, then the first one is assumed to be the
|
||
directory name and the second one is really the source file name.
|
||
|
||
So we have to patch up the subfile struct by moving the old name
|
||
value to dirname and remembering the new name. Some sanity
|
||
checking is performed to ensure that the state of the subfile
|
||
struct is reasonable and that the old name we are assuming to be a
|
||
directory name actually is (by checking for a trailing '/'). */
|
||
|
||
void
|
||
patch_subfile_names (struct subfile *subfile, char *name)
|
||
{
|
||
if (subfile != NULL && subfile->dirname == NULL && subfile->name != NULL
|
||
&& subfile->name[strlen (subfile->name) - 1] == '/')
|
||
{
|
||
subfile->dirname = subfile->name;
|
||
subfile->name = savestring (name, strlen (name));
|
||
last_source_file = name;
|
||
|
||
/* Default the source language to whatever can be deduced from
|
||
the filename. If nothing can be deduced (such as for a C/C++
|
||
include file with a ".h" extension), then inherit whatever
|
||
language the previous subfile had. This kludgery is
|
||
necessary because there is no standard way in some object
|
||
formats to record the source language. Also, when symtabs
|
||
are allocated we try to deduce a language then as well, but
|
||
it is too late for us to use that information while reading
|
||
symbols, since symtabs aren't allocated until after all the
|
||
symbols have been processed for a given source file. */
|
||
|
||
subfile->language = deduce_language_from_filename (subfile->name);
|
||
if (subfile->language == language_unknown &&
|
||
subfile->next != NULL)
|
||
{
|
||
subfile->language = subfile->next->language;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Handle the N_BINCL and N_EINCL symbol types that act like N_SOL for
|
||
switching source files (different subfiles, as we call them) within
|
||
one object file, but using a stack rather than in an arbitrary
|
||
order. */
|
||
|
||
void
|
||
push_subfile (void)
|
||
{
|
||
struct subfile_stack *tem
|
||
= (struct subfile_stack *) xmalloc (sizeof (struct subfile_stack));
|
||
|
||
tem->next = subfile_stack;
|
||
subfile_stack = tem;
|
||
if (current_subfile == NULL || current_subfile->name == NULL)
|
||
{
|
||
internal_error (__FILE__, __LINE__, _("failed internal consistency check"));
|
||
}
|
||
tem->name = current_subfile->name;
|
||
}
|
||
|
||
char *
|
||
pop_subfile (void)
|
||
{
|
||
char *name;
|
||
struct subfile_stack *link = subfile_stack;
|
||
|
||
if (link == NULL)
|
||
{
|
||
internal_error (__FILE__, __LINE__, _("failed internal consistency check"));
|
||
}
|
||
name = link->name;
|
||
subfile_stack = link->next;
|
||
xfree ((void *) link);
|
||
return (name);
|
||
}
|
||
|
||
/* Add a linetable entry for line number LINE and address PC to the
|
||
line vector for SUBFILE. */
|
||
|
||
void
|
||
record_line (struct subfile *subfile, int line, CORE_ADDR pc)
|
||
{
|
||
struct linetable_entry *e;
|
||
/* Ignore the dummy line number in libg.o */
|
||
|
||
if (line == 0xffff)
|
||
{
|
||
return;
|
||
}
|
||
|
||
/* Make sure line vector exists and is big enough. */
|
||
if (!subfile->line_vector)
|
||
{
|
||
subfile->line_vector_length = INITIAL_LINE_VECTOR_LENGTH;
|
||
subfile->line_vector = (struct linetable *)
|
||
xmalloc (sizeof (struct linetable)
|
||
+ subfile->line_vector_length * sizeof (struct linetable_entry));
|
||
subfile->line_vector->nitems = 0;
|
||
have_line_numbers = 1;
|
||
}
|
||
|
||
if (subfile->line_vector->nitems + 1 >= subfile->line_vector_length)
|
||
{
|
||
subfile->line_vector_length *= 2;
|
||
subfile->line_vector = (struct linetable *)
|
||
xrealloc ((char *) subfile->line_vector,
|
||
(sizeof (struct linetable)
|
||
+ (subfile->line_vector_length
|
||
* sizeof (struct linetable_entry))));
|
||
}
|
||
|
||
pc = gdbarch_addr_bits_remove (current_gdbarch, pc);
|
||
|
||
/* Normally, we treat lines as unsorted. But the end of sequence
|
||
marker is special. We sort line markers at the same PC by line
|
||
number, so end of sequence markers (which have line == 0) appear
|
||
first. This is right if the marker ends the previous function,
|
||
and there is no padding before the next function. But it is
|
||
wrong if the previous line was empty and we are now marking a
|
||
switch to a different subfile. We must leave the end of sequence
|
||
marker at the end of this group of lines, not sort the empty line
|
||
to after the marker. The easiest way to accomplish this is to
|
||
delete any empty lines from our table, if they are followed by
|
||
end of sequence markers. All we lose is the ability to set
|
||
breakpoints at some lines which contain no instructions
|
||
anyway. */
|
||
if (line == 0 && subfile->line_vector->nitems > 0)
|
||
{
|
||
e = subfile->line_vector->item + subfile->line_vector->nitems - 1;
|
||
while (subfile->line_vector->nitems > 0 && e->pc == pc)
|
||
{
|
||
e--;
|
||
subfile->line_vector->nitems--;
|
||
}
|
||
}
|
||
|
||
e = subfile->line_vector->item + subfile->line_vector->nitems++;
|
||
e->line = line;
|
||
e->pc = pc;
|
||
}
|
||
|
||
/* Needed in order to sort line tables from IBM xcoff files. Sigh! */
|
||
|
||
static int
|
||
compare_line_numbers (const void *ln1p, const void *ln2p)
|
||
{
|
||
struct linetable_entry *ln1 = (struct linetable_entry *) ln1p;
|
||
struct linetable_entry *ln2 = (struct linetable_entry *) ln2p;
|
||
|
||
/* Note: this code does not assume that CORE_ADDRs can fit in ints.
|
||
Please keep it that way. */
|
||
if (ln1->pc < ln2->pc)
|
||
return -1;
|
||
|
||
if (ln1->pc > ln2->pc)
|
||
return 1;
|
||
|
||
/* If pc equal, sort by line. I'm not sure whether this is optimum
|
||
behavior (see comment at struct linetable in symtab.h). */
|
||
return ln1->line - ln2->line;
|
||
}
|
||
|
||
/* Start a new symtab for a new source file. Called, for example,
|
||
when a stabs symbol of type N_SO is seen, or when a DWARF
|
||
TAG_compile_unit DIE is seen. It indicates the start of data for
|
||
one original source file.
|
||
|
||
NAME is the name of the file (cannot be NULL). DIRNAME is the directory in
|
||
which the file was compiled (or NULL if not known). START_ADDR is the
|
||
lowest address of objects in the file (or 0 if not known). */
|
||
|
||
void
|
||
start_symtab (char *name, char *dirname, CORE_ADDR start_addr)
|
||
{
|
||
last_source_file = name;
|
||
last_source_start_addr = start_addr;
|
||
file_symbols = NULL;
|
||
global_symbols = NULL;
|
||
within_function = 0;
|
||
have_line_numbers = 0;
|
||
|
||
/* Context stack is initially empty. Allocate first one with room
|
||
for 10 levels; reuse it forever afterward. */
|
||
if (context_stack == NULL)
|
||
{
|
||
context_stack_size = INITIAL_CONTEXT_STACK_SIZE;
|
||
context_stack = (struct context_stack *)
|
||
xmalloc (context_stack_size * sizeof (struct context_stack));
|
||
}
|
||
context_stack_depth = 0;
|
||
|
||
/* Set up support for C++ namespace support, in case we need it. */
|
||
|
||
cp_initialize_namespace ();
|
||
|
||
/* Initialize the list of sub source files with one entry for this
|
||
file (the top-level source file). */
|
||
|
||
subfiles = NULL;
|
||
current_subfile = NULL;
|
||
start_subfile (name, dirname);
|
||
}
|
||
|
||
/* Finish the symbol definitions for one main source file, close off
|
||
all the lexical contexts for that file (creating struct block's for
|
||
them), then make the struct symtab for that file and put it in the
|
||
list of all such.
|
||
|
||
END_ADDR is the address of the end of the file's text. SECTION is
|
||
the section number (in objfile->section_offsets) of the blockvector
|
||
and linetable.
|
||
|
||
Note that it is possible for end_symtab() to return NULL. In
|
||
particular, for the DWARF case at least, it will return NULL when
|
||
it finds a compilation unit that has exactly one DIE, a
|
||
TAG_compile_unit DIE. This can happen when we link in an object
|
||
file that was compiled from an empty source file. Returning NULL
|
||
is probably not the correct thing to do, because then gdb will
|
||
never know about this empty file (FIXME). */
|
||
|
||
struct symtab *
|
||
end_symtab (CORE_ADDR end_addr, struct objfile *objfile, int section)
|
||
{
|
||
struct symtab *symtab = NULL;
|
||
struct blockvector *blockvector;
|
||
struct subfile *subfile;
|
||
struct context_stack *cstk;
|
||
struct subfile *nextsub;
|
||
|
||
/* Finish the lexical context of the last function in the file; pop
|
||
the context stack. */
|
||
|
||
if (context_stack_depth > 0)
|
||
{
|
||
cstk = pop_context ();
|
||
/* Make a block for the local symbols within. */
|
||
finish_block (cstk->name, &local_symbols, cstk->old_blocks,
|
||
cstk->start_addr, end_addr, objfile);
|
||
|
||
if (context_stack_depth > 0)
|
||
{
|
||
/* This is said to happen with SCO. The old coffread.c
|
||
code simply emptied the context stack, so we do the
|
||
same. FIXME: Find out why it is happening. This is not
|
||
believed to happen in most cases (even for coffread.c);
|
||
it used to be an abort(). */
|
||
complaint (&symfile_complaints,
|
||
_("Context stack not empty in end_symtab"));
|
||
context_stack_depth = 0;
|
||
}
|
||
}
|
||
|
||
/* Reordered executables may have out of order pending blocks; if
|
||
OBJF_REORDERED is true, then sort the pending blocks. */
|
||
if ((objfile->flags & OBJF_REORDERED) && pending_blocks)
|
||
{
|
||
/* FIXME! Remove this horrid bubble sort and use merge sort!!! */
|
||
int swapped;
|
||
do
|
||
{
|
||
struct pending_block *pb, *pbnext;
|
||
|
||
pb = pending_blocks;
|
||
pbnext = pb->next;
|
||
swapped = 0;
|
||
|
||
while (pbnext)
|
||
{
|
||
/* swap blocks if unordered! */
|
||
|
||
if (BLOCK_START (pb->block) < BLOCK_START (pbnext->block))
|
||
{
|
||
struct block *tmp = pb->block;
|
||
pb->block = pbnext->block;
|
||
pbnext->block = tmp;
|
||
swapped = 1;
|
||
}
|
||
pb = pbnext;
|
||
pbnext = pbnext->next;
|
||
}
|
||
}
|
||
while (swapped);
|
||
}
|
||
|
||
/* Cleanup any undefined types that have been left hanging around
|
||
(this needs to be done before the finish_blocks so that
|
||
file_symbols is still good).
|
||
|
||
Both cleanup_undefined_types and finish_global_stabs are stabs
|
||
specific, but harmless for other symbol readers, since on gdb
|
||
startup or when finished reading stabs, the state is set so these
|
||
are no-ops. FIXME: Is this handled right in case of QUIT? Can
|
||
we make this cleaner? */
|
||
|
||
cleanup_undefined_types ();
|
||
finish_global_stabs (objfile);
|
||
|
||
if (pending_blocks == NULL
|
||
&& file_symbols == NULL
|
||
&& global_symbols == NULL
|
||
&& have_line_numbers == 0
|
||
&& pending_macros == NULL)
|
||
{
|
||
/* Ignore symtabs that have no functions with real debugging
|
||
info. */
|
||
blockvector = NULL;
|
||
}
|
||
else
|
||
{
|
||
/* Define the STATIC_BLOCK & GLOBAL_BLOCK, and build the
|
||
blockvector. */
|
||
finish_block (0, &file_symbols, 0, last_source_start_addr, end_addr,
|
||
objfile);
|
||
finish_block (0, &global_symbols, 0, last_source_start_addr, end_addr,
|
||
objfile);
|
||
blockvector = make_blockvector (objfile);
|
||
cp_finalize_namespace (BLOCKVECTOR_BLOCK (blockvector, STATIC_BLOCK),
|
||
&objfile->objfile_obstack);
|
||
}
|
||
|
||
/* Read the line table if it has to be read separately. */
|
||
if (objfile->sf->sym_read_linetable != NULL)
|
||
objfile->sf->sym_read_linetable ();
|
||
|
||
/* Now create the symtab objects proper, one for each subfile. */
|
||
/* (The main file is the last one on the chain.) */
|
||
|
||
for (subfile = subfiles; subfile; subfile = nextsub)
|
||
{
|
||
int linetablesize = 0;
|
||
symtab = NULL;
|
||
|
||
/* If we have blocks of symbols, make a symtab. Otherwise, just
|
||
ignore this file and any line number info in it. */
|
||
if (blockvector)
|
||
{
|
||
if (subfile->line_vector)
|
||
{
|
||
linetablesize = sizeof (struct linetable) +
|
||
subfile->line_vector->nitems * sizeof (struct linetable_entry);
|
||
|
||
/* Like the pending blocks, the line table may be
|
||
scrambled in reordered executables. Sort it if
|
||
OBJF_REORDERED is true. */
|
||
if (objfile->flags & OBJF_REORDERED)
|
||
qsort (subfile->line_vector->item,
|
||
subfile->line_vector->nitems,
|
||
sizeof (struct linetable_entry), compare_line_numbers);
|
||
}
|
||
|
||
/* Now, allocate a symbol table. */
|
||
if (subfile->symtab == NULL)
|
||
symtab = allocate_symtab (subfile->name, objfile);
|
||
else
|
||
symtab = subfile->symtab;
|
||
|
||
/* Fill in its components. */
|
||
symtab->blockvector = blockvector;
|
||
symtab->macro_table = pending_macros;
|
||
if (subfile->line_vector)
|
||
{
|
||
/* Reallocate the line table on the symbol obstack */
|
||
symtab->linetable = (struct linetable *)
|
||
obstack_alloc (&objfile->objfile_obstack, linetablesize);
|
||
memcpy (symtab->linetable, subfile->line_vector, linetablesize);
|
||
}
|
||
else
|
||
{
|
||
symtab->linetable = NULL;
|
||
}
|
||
symtab->block_line_section = section;
|
||
if (subfile->dirname)
|
||
{
|
||
/* Reallocate the dirname on the symbol obstack */
|
||
symtab->dirname = (char *)
|
||
obstack_alloc (&objfile->objfile_obstack,
|
||
strlen (subfile->dirname) + 1);
|
||
strcpy (symtab->dirname, subfile->dirname);
|
||
}
|
||
else
|
||
{
|
||
symtab->dirname = NULL;
|
||
}
|
||
symtab->free_code = free_linetable;
|
||
symtab->free_func = NULL;
|
||
|
||
/* Use whatever language we have been using for this
|
||
subfile, not the one that was deduced in allocate_symtab
|
||
from the filename. We already did our own deducing when
|
||
we created the subfile, and we may have altered our
|
||
opinion of what language it is from things we found in
|
||
the symbols. */
|
||
symtab->language = subfile->language;
|
||
|
||
/* Save the debug format string (if any) in the symtab */
|
||
if (subfile->debugformat != NULL)
|
||
{
|
||
symtab->debugformat = obsavestring (subfile->debugformat,
|
||
strlen (subfile->debugformat),
|
||
&objfile->objfile_obstack);
|
||
}
|
||
|
||
/* Similarly for the producer. */
|
||
if (subfile->producer != NULL)
|
||
symtab->producer = obsavestring (subfile->producer,
|
||
strlen (subfile->producer),
|
||
&objfile->objfile_obstack);
|
||
|
||
/* All symtabs for the main file and the subfiles share a
|
||
blockvector, so we need to clear primary for everything
|
||
but the main file. */
|
||
|
||
symtab->primary = 0;
|
||
}
|
||
if (subfile->name != NULL)
|
||
{
|
||
xfree ((void *) subfile->name);
|
||
}
|
||
if (subfile->dirname != NULL)
|
||
{
|
||
xfree ((void *) subfile->dirname);
|
||
}
|
||
if (subfile->line_vector != NULL)
|
||
{
|
||
xfree ((void *) subfile->line_vector);
|
||
}
|
||
if (subfile->debugformat != NULL)
|
||
{
|
||
xfree ((void *) subfile->debugformat);
|
||
}
|
||
if (subfile->producer != NULL)
|
||
xfree (subfile->producer);
|
||
|
||
nextsub = subfile->next;
|
||
xfree ((void *) subfile);
|
||
}
|
||
|
||
/* Set this for the main source file. */
|
||
if (symtab)
|
||
{
|
||
symtab->primary = 1;
|
||
}
|
||
|
||
/* Default any symbols without a specified symtab to the primary
|
||
symtab. */
|
||
if (blockvector)
|
||
{
|
||
int block_i;
|
||
|
||
for (block_i = 0; block_i < BLOCKVECTOR_NBLOCKS (blockvector); block_i++)
|
||
{
|
||
struct block *block = BLOCKVECTOR_BLOCK (blockvector, block_i);
|
||
struct symbol *sym;
|
||
struct dict_iterator iter;
|
||
|
||
for (sym = dict_iterator_first (BLOCK_DICT (block), &iter);
|
||
sym != NULL;
|
||
sym = dict_iterator_next (&iter))
|
||
if (SYMBOL_SYMTAB (sym) == NULL)
|
||
SYMBOL_SYMTAB (sym) = symtab;
|
||
}
|
||
}
|
||
|
||
last_source_file = NULL;
|
||
current_subfile = NULL;
|
||
pending_macros = NULL;
|
||
|
||
return symtab;
|
||
}
|
||
|
||
/* Push a context block. Args are an identifying nesting level
|
||
(checkable when you pop it), and the starting PC address of this
|
||
context. */
|
||
|
||
struct context_stack *
|
||
push_context (int desc, CORE_ADDR valu)
|
||
{
|
||
struct context_stack *new;
|
||
|
||
if (context_stack_depth == context_stack_size)
|
||
{
|
||
context_stack_size *= 2;
|
||
context_stack = (struct context_stack *)
|
||
xrealloc ((char *) context_stack,
|
||
(context_stack_size * sizeof (struct context_stack)));
|
||
}
|
||
|
||
new = &context_stack[context_stack_depth++];
|
||
new->depth = desc;
|
||
new->locals = local_symbols;
|
||
new->params = param_symbols;
|
||
new->old_blocks = pending_blocks;
|
||
new->start_addr = valu;
|
||
new->name = NULL;
|
||
|
||
local_symbols = NULL;
|
||
param_symbols = NULL;
|
||
|
||
return new;
|
||
}
|
||
|
||
/* Pop a context block. Returns the address of the context block just
|
||
popped. */
|
||
|
||
struct context_stack *
|
||
pop_context (void)
|
||
{
|
||
gdb_assert (context_stack_depth > 0);
|
||
return (&context_stack[--context_stack_depth]);
|
||
}
|
||
|
||
|
||
|
||
/* Compute a small integer hash code for the given name. */
|
||
|
||
int
|
||
hashname (char *name)
|
||
{
|
||
return (hash(name,strlen(name)) % HASHSIZE);
|
||
}
|
||
|
||
|
||
void
|
||
record_debugformat (char *format)
|
||
{
|
||
current_subfile->debugformat = savestring (format, strlen (format));
|
||
}
|
||
|
||
void
|
||
record_producer (const char *producer)
|
||
{
|
||
/* The producer is not always provided in the debugging info.
|
||
Do nothing if PRODUCER is NULL. */
|
||
if (producer == NULL)
|
||
return;
|
||
|
||
current_subfile->producer = savestring (producer, strlen (producer));
|
||
}
|
||
|
||
/* Merge the first symbol list SRCLIST into the second symbol list
|
||
TARGETLIST by repeated calls to add_symbol_to_list(). This
|
||
procedure "frees" each link of SRCLIST by adding it to the
|
||
free_pendings list. Caller must set SRCLIST to a null list after
|
||
calling this function.
|
||
|
||
Void return. */
|
||
|
||
void
|
||
merge_symbol_lists (struct pending **srclist, struct pending **targetlist)
|
||
{
|
||
int i;
|
||
|
||
if (!srclist || !*srclist)
|
||
return;
|
||
|
||
/* Merge in elements from current link. */
|
||
for (i = 0; i < (*srclist)->nsyms; i++)
|
||
add_symbol_to_list ((*srclist)->symbol[i], targetlist);
|
||
|
||
/* Recurse on next. */
|
||
merge_symbol_lists (&(*srclist)->next, targetlist);
|
||
|
||
/* "Free" the current link. */
|
||
(*srclist)->next = free_pendings;
|
||
free_pendings = (*srclist);
|
||
}
|
||
|
||
/* Initialize anything that needs initializing when starting to read a
|
||
fresh piece of a symbol file, e.g. reading in the stuff
|
||
corresponding to a psymtab. */
|
||
|
||
void
|
||
buildsym_init (void)
|
||
{
|
||
free_pendings = NULL;
|
||
file_symbols = NULL;
|
||
global_symbols = NULL;
|
||
pending_blocks = NULL;
|
||
pending_macros = NULL;
|
||
}
|
||
|
||
/* Initialize anything that needs initializing when a completely new
|
||
symbol file is specified (not just adding some symbols from another
|
||
file, e.g. a shared library). */
|
||
|
||
void
|
||
buildsym_new_init (void)
|
||
{
|
||
buildsym_init ();
|
||
}
|