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963 lines
25 KiB
C
963 lines
25 KiB
C
/* Generic symbol file reading for the GNU debugger, GDB.
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Copyright 1990, 1991 Free Software Foundation, Inc.
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Contributed by Cygnus Support, using pieces from other GDB modules.
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This file is part of GDB.
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GDB 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
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GDB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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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 GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include "defs.h"
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#include "symtab.h"
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#include "param.h"
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#include "gdbcore.h"
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#include "frame.h"
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#include "target.h"
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#include "value.h"
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#include "symfile.h"
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#include "gdbcmd.h"
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#include "breakpoint.h"
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#include <obstack.h>
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#include <assert.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/stat.h>
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extern int info_verbose;
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extern void qsort ();
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extern char *getenv ();
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/* Functions this file defines */
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static bfd *symfile_open();
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static struct sym_fns *symfile_init();
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static void clear_symtab_users_once();
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/* List of all available sym_fns. */
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struct sym_fns *symtab_fns = NULL;
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/* Saves the sym_fns of the current symbol table, so we can call
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the right sym_discard function when we free it. */
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static struct sym_fns *symfile_fns;
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/* Allocate an obstack to hold objects that should be freed
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when we load a new symbol table.
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This includes the symbols made by dbxread
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and the types that are not permanent. */
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struct obstack obstack1;
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struct obstack *symbol_obstack = &obstack1;
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/* This obstack will be used for partial_symbol objects. It can
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probably actually be the same as the symbol_obstack above, but I'd
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like to keep them seperate for now. If I want to later, I'll
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replace one with the other. */
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struct obstack obstack2;
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struct obstack *psymbol_obstack = &obstack2;
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/* File name symbols were loaded from. */
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char *symfile = 0;
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/* The modification date of the file when they were loaded. */
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long /* really time_t */ symfile_mtime = 0;
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/* Structures with which to manage partial symbol allocation. */
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struct psymbol_allocation_list global_psymbols = {0}, static_psymbols = {0};
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/* Structure to manage complaints about symbol file contents. */
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struct complaint complaint_root[1] = {
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{(char *)0, 0, complaint_root},
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};
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/* Some actual complaints. */
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struct complaint oldsyms_complaint = {
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"Replacing old symbols for `%s'", 0, 0 };
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struct complaint empty_symtab_complaint = {
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"Empty symbol table found for `%s'", 0, 0 };
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/* In the following sort, we always make sure that
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register debug symbol declarations always come before regular
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debug symbol declarations (as might happen when parameters are
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then put into registers by the compiler). */
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static int
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compare_symbols (s1, s2)
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struct symbol **s1, **s2;
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{
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register int namediff;
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/* Compare the initial characters. */
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namediff = SYMBOL_NAME (*s1)[0] - SYMBOL_NAME (*s2)[0];
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if (namediff != 0) return namediff;
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/* If they match, compare the rest of the names. */
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namediff = strcmp (SYMBOL_NAME (*s1), SYMBOL_NAME (*s2));
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if (namediff != 0) return namediff;
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/* For symbols of the same name, registers should come first. */
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return ((SYMBOL_CLASS (*s2) == LOC_REGISTER)
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- (SYMBOL_CLASS (*s1) == LOC_REGISTER));
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}
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/* Call sort_block_syms to sort alphabetically the symbols of one block. */
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void
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sort_block_syms (b)
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register struct block *b;
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{
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qsort (&BLOCK_SYM (b, 0), BLOCK_NSYMS (b),
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sizeof (struct symbol *), compare_symbols);
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}
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/* Call sort_symtab_syms to sort alphabetically
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the symbols of each block of one symtab. */
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void
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sort_symtab_syms (s)
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register struct symtab *s;
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{
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register struct blockvector *bv = BLOCKVECTOR (s);
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int nbl = BLOCKVECTOR_NBLOCKS (bv);
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int i;
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register struct block *b;
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for (i = 0; i < nbl; i++)
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{
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b = BLOCKVECTOR_BLOCK (bv, i);
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if (BLOCK_SHOULD_SORT (b))
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sort_block_syms (b);
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}
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}
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void
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sort_all_symtab_syms ()
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{
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register struct symtab *s;
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for (s = symtab_list; s; s = s->next)
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{
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sort_symtab_syms (s);
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}
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}
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/* Make a copy of the string at PTR with SIZE characters in the symbol obstack
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(and add a null character at the end in the copy).
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Returns the address of the copy. */
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char *
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obsavestring (ptr, size)
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char *ptr;
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int size;
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{
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register char *p = (char *) obstack_alloc (symbol_obstack, size + 1);
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/* Open-coded bcopy--saves function call time.
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These strings are usually short. */
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{
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register char *p1 = ptr;
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register char *p2 = p;
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char *end = ptr + size;
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while (p1 != end)
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*p2++ = *p1++;
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}
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p[size] = 0;
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return p;
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}
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/* Concatenate strings S1, S2 and S3; return the new string.
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Space is found in the symbol_obstack. */
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char *
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obconcat (s1, s2, s3)
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char *s1, *s2, *s3;
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{
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register int len = strlen (s1) + strlen (s2) + strlen (s3) + 1;
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register char *val = (char *) obstack_alloc (symbol_obstack, len);
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strcpy (val, s1);
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strcat (val, s2);
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strcat (val, s3);
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return val;
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}
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/* Accumulate the misc functions in bunches of 127.
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At the end, copy them all into one newly allocated structure. */
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#define MISC_BUNCH_SIZE 127
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struct misc_bunch
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{
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struct misc_bunch *next;
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struct misc_function contents[MISC_BUNCH_SIZE];
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};
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/* Bunch currently being filled up.
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The next field points to chain of filled bunches. */
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static struct misc_bunch *misc_bunch;
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/* Number of slots filled in current bunch. */
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static int misc_bunch_index;
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/* Total number of misc functions recorded so far. */
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static int misc_count;
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void
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init_misc_bunches ()
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{
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misc_count = 0;
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misc_bunch = 0;
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misc_bunch_index = MISC_BUNCH_SIZE;
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}
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void
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prim_record_misc_function (name, address, misc_type)
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char *name;
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CORE_ADDR address;
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enum misc_function_type misc_type;
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{
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register struct misc_bunch *new;
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if (misc_bunch_index == MISC_BUNCH_SIZE)
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{
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new = (struct misc_bunch *) xmalloc (sizeof (struct misc_bunch));
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misc_bunch_index = 0;
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new->next = misc_bunch;
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misc_bunch = new;
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}
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misc_bunch->contents[misc_bunch_index].name = name;
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misc_bunch->contents[misc_bunch_index].address = address;
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misc_bunch->contents[misc_bunch_index].type = misc_type;
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misc_bunch->contents[misc_bunch_index].misc_info = 0;
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misc_bunch_index++;
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misc_count++;
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}
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static int
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compare_misc_functions (fn1, fn2)
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struct misc_function *fn1, *fn2;
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{
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/* Return a signed result based on unsigned comparisons
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so that we sort into unsigned numeric order. */
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if (fn1->address < fn2->address)
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return -1;
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if (fn1->address > fn2->address)
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return 1;
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return 0;
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}
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/* ARGSUSED */
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void
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discard_misc_bunches (foo)
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int foo;
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{
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register struct misc_bunch *next;
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while (misc_bunch)
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{
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next = misc_bunch->next;
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free (misc_bunch);
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misc_bunch = next;
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}
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}
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/* INCLINK nonzero means bunches are from an incrementally-linked file.
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Add them to the existing bunches.
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Otherwise INCLINK is zero, and we start from scratch. */
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void
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condense_misc_bunches (inclink)
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int inclink;
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{
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register int i, j;
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register struct misc_bunch *bunch;
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if (inclink)
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{
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misc_function_vector
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= (struct misc_function *)
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xrealloc (misc_function_vector, (misc_count + misc_function_count)
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* sizeof (struct misc_function));
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j = misc_function_count;
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}
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else
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{
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misc_function_vector
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= (struct misc_function *)
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xmalloc (misc_count * sizeof (struct misc_function));
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j = 0;
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}
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bunch = misc_bunch;
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while (bunch)
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{
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for (i = 0; i < misc_bunch_index; i++, j++)
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{
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misc_function_vector[j] = bunch->contents[i];
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#ifdef NAMES_HAVE_UNDERSCORE
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if (misc_function_vector[j].name[0] == '_')
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misc_function_vector[j].name++;
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#endif
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}
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bunch = bunch->next;
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misc_bunch_index = MISC_BUNCH_SIZE;
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}
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if (misc_function_count + misc_count != j) /* DEBUG */
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printf_filtered ("Function counts are off! %d + %d != %d\n",
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misc_function_count, misc_count, j);
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misc_function_count = j;
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/* Sort the misc functions by address. */
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qsort (misc_function_vector, misc_function_count,
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sizeof (struct misc_function),
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compare_misc_functions);
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}
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/* Get the symbol table that corresponds to a partial_symtab.
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This is fast after the first time you do it. In fact, there
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is an even faster macro PSYMTAB_TO_SYMTAB that does the fast
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case inline. */
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struct symtab *
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psymtab_to_symtab (pst)
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register struct partial_symtab *pst;
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{
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register struct symtab *result;
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/* If it's been looked up before, return it. */
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if (pst->symtab)
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return pst->symtab;
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/* If it has not yet been read in, read it. */
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if (!pst->readin)
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{
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(*pst->read_symtab) (pst);
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}
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/* Search through list for correct name. */
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for (result = symtab_list; result; result = result->next)
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if (!strcmp (result->filename, pst->filename))
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{
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pst->symtab = result; /* Remember where it was. */
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return result;
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}
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return 0;
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}
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/* Process a symbol file, as either the main file or as a dynamically
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loaded file.
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NAME is the file name (which will be tilde-expanded and made
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absolute herein) (but we don't free or modify NAME itself).
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FROM_TTY says how verbose to be. MAINLINE specifies whether this
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is the main symbol file, or whether it's an extra symbol file such
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as dynamically loaded code. If !mainline, ADDR is the address
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where the text segment was loaded. */
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void
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symbol_file_add (name, from_tty, addr, mainline)
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char *name;
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int from_tty;
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CORE_ADDR addr;
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int mainline;
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{
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bfd *sym_bfd;
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asection *text_sect;
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struct sym_fns *sf;
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char *realname;
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sym_bfd = symfile_open (name);
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entry_point = bfd_get_start_address (sym_bfd);
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if (mainline)
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symfile_mtime = bfd_get_mtime (sym_bfd);
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/* There is a distinction between having no symbol table
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(we refuse to read the file, leaving the old set of symbols around)
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and having no debugging symbols in your symbol table (we read
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the file and end up with a mostly empty symbol table). */
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if (!(bfd_get_file_flags (sym_bfd) & HAS_SYMS))
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{
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error ("%s has no symbol-table", name);
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}
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if ((symtab_list || partial_symtab_list)
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&& mainline
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&& from_tty
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&& !query ("Load new symbol table from \"%s\"? ", name))
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error ("Not confirmed.");
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if (from_tty)
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{
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printf_filtered ("Reading symbol data from %s...", name);
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wrap_here ("");
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fflush (stdout);
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}
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sf = symfile_init (sym_bfd);
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realname = bfd_get_filename (sym_bfd);
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realname = savestring (realname, strlen (realname));
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/* FIXME, this probably creates a storage leak... */
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if (mainline)
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{
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/* Since no error yet, throw away the old symbol table. */
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if (symfile)
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free (symfile);
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symfile = 0;
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free_all_symtabs ();
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free_all_psymtabs ();
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(*sf->sym_new_init) ();
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/* For mainline, caller didn't know the specified address of the
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text section. We fix that here. */
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text_sect = bfd_get_section_by_name (sym_bfd, ".text");
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addr = bfd_section_vma (sym_bfd, text_sect);
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}
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clear_complaints(); /* Allow complaints to appear for this new file. */
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(*sf->sym_read) (sf, addr, mainline);
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/* Don't allow char * to have a typename (else would get caddr_t.) */
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/* Ditto void *. FIXME should do this for all the builtin types. */
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TYPE_NAME (lookup_pointer_type (builtin_type_char)) = 0;
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TYPE_NAME (lookup_pointer_type (builtin_type_void)) = 0;
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if (mainline)
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{
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/* OK, make it the "real" symbol file. */
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symfile = realname;
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symfile_fns = sf;
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}
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/* If we have wiped out any old symbol tables, clean up. */
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clear_symtab_users_once ();
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if (from_tty)
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{
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printf_filtered ("done.\n");
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fflush (stdout);
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}
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}
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/* This is the symbol-file command. Read the file, analyze its symbols,
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and add a struct symtab to symtab_list. */
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void
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symbol_file_command (name, from_tty)
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char *name;
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int from_tty;
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{
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dont_repeat ();
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if (name == 0)
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{
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if ((symtab_list || partial_symtab_list)
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&& from_tty
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&& !query ("Discard symbol table from `%s'? ", symfile))
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error ("Not confirmed.");
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if (symfile)
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free (symfile);
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symfile = 0;
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free_all_symtabs ();
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free_all_psymtabs ();
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/* FIXME, this does not account for the main file and subsequent
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files (shared libs, dynloads, etc) having different formats.
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It only calls the cleanup routine for the main file's format. */
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if (symfile_fns) {
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(*symfile_fns->sym_new_init) ();
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free (symfile_fns);
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symfile_fns = 0;
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}
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return;
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}
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/* Getting new symbols may change our opinion about what is
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frameless. */
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reinit_frame_cache ();
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symbol_file_add (name, from_tty, (CORE_ADDR)0, 1);
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}
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/* Open NAME and hand it off to BFD for preliminary analysis. Result
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is a BFD *, which includes a new copy of NAME dynamically allocated
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(which will be freed by the cleanup chain). In case of trouble,
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error() is called. */
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static bfd *
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symfile_open (name)
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char *name;
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{
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bfd *sym_bfd;
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int desc;
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char *absolute_name;
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name = tilde_expand (name);
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make_cleanup (free, name);
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desc = openp (getenv ("PATH"), 1, name, O_RDONLY, 0, &absolute_name);
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if (desc < 0)
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perror_with_name (name);
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else
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{
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make_cleanup (free, absolute_name);
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name = absolute_name;
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}
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sym_bfd = bfd_fdopenr (name, NULL, desc);
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if (!sym_bfd)
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{
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close (desc);
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error ("Could not open `%s' to read symbols: %s",
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name, bfd_errmsg (bfd_error));
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}
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make_cleanup (bfd_close, sym_bfd);
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if (!bfd_check_format (sym_bfd, bfd_object))
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error ("\"%s\": can't read symbols: %s.",
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name, bfd_errmsg (bfd_error));
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||
|
||
return sym_bfd;
|
||
}
|
||
|
||
/* Link a new symtab_fns into the global symtab_fns list.
|
||
Called by various _initialize routines. */
|
||
|
||
void
|
||
add_symtab_fns (sf)
|
||
struct sym_fns *sf;
|
||
{
|
||
sf->next = symtab_fns;
|
||
symtab_fns = sf;
|
||
}
|
||
|
||
|
||
/* Initialize to read symbols from the symbol file sym_bfd. It either
|
||
returns or calls error(). The result is a malloc'd struct sym_fns
|
||
that contains cached information about the symbol file. */
|
||
|
||
static struct sym_fns *
|
||
symfile_init (sym_bfd)
|
||
bfd *sym_bfd;
|
||
{
|
||
struct sym_fns *sf, *sf2;
|
||
|
||
for (sf = symtab_fns; sf != NULL; sf = sf->next)
|
||
{
|
||
if (!strncmp (bfd_get_target (sym_bfd), sf->sym_name, sf->sym_namelen))
|
||
{
|
||
sf2 = (struct sym_fns *)xmalloc (sizeof (*sf2));
|
||
/* FIXME, who frees this? */
|
||
*sf2 = *sf;
|
||
sf2->sym_bfd = sym_bfd;
|
||
sf2->sym_private = 0; /* Not alloc'd yet */
|
||
(*sf2->sym_init) (sf2);
|
||
return sf2;
|
||
}
|
||
}
|
||
error ("I'm sorry, Dave, I can't do that. Symbol format unknown.");
|
||
return 0; /* Appease lint. */
|
||
}
|
||
|
||
/* This function runs the load command of our current target. */
|
||
|
||
void
|
||
load_command (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
target_load (arg, from_tty);
|
||
}
|
||
|
||
/* This function runs the add_syms command of our current target. */
|
||
|
||
void
|
||
add_symbol_file_command (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
/* Getting new symbols may change our opinion about what is
|
||
frameless. */
|
||
reinit_frame_cache ();
|
||
|
||
target_add_syms (args, from_tty);
|
||
}
|
||
|
||
/* This function allows the addition of incrementally linked object files. */
|
||
|
||
/* ARGSUSED */
|
||
void
|
||
add_syms_addr_command (arg_string, from_tty)
|
||
char* arg_string;
|
||
int from_tty;
|
||
{
|
||
char *name;
|
||
CORE_ADDR text_addr;
|
||
|
||
if (arg_string == 0)
|
||
error ("add-symbol-file takes a file name and an address");
|
||
|
||
arg_string = tilde_expand (arg_string);
|
||
make_cleanup (free, arg_string);
|
||
|
||
for( ; *arg_string == ' '; arg_string++ );
|
||
name = arg_string;
|
||
for( ; *arg_string && *arg_string != ' ' ; arg_string++ );
|
||
*arg_string++ = (char) 0;
|
||
|
||
if (name[0] == 0)
|
||
error ("add-symbol-file takes a file name and an address");
|
||
|
||
text_addr = parse_and_eval_address (arg_string);
|
||
|
||
dont_repeat ();
|
||
|
||
if (!query ("add symbol table from file \"%s\" at text_addr = 0x%x\n",
|
||
name, text_addr))
|
||
error ("Not confirmed.");
|
||
|
||
symbol_file_add (name, 0, text_addr, 0);
|
||
}
|
||
|
||
/* Re-read symbols if the symbol-file has changed. */
|
||
void
|
||
reread_symbols ()
|
||
{
|
||
struct stat symstat;
|
||
|
||
/* With the addition of shared libraries, this should be modified,
|
||
the load time should be saved in the partial symbol tables, since
|
||
different tables may come from different source files. FIXME.
|
||
This routine should then walk down each partial symbol table
|
||
and see if the symbol table that it originates from has been changed
|
||
*/
|
||
|
||
if (stat (symfile, &symstat) < 0)
|
||
/* Can't read symbol-file. Assume it is up to date. */
|
||
return;
|
||
|
||
if (symstat.st_mtime > symfile_mtime)
|
||
{
|
||
printf_filtered ("Symbol file has changed; re-reading symbols.\n");
|
||
symbol_file_command (symfile, 0);
|
||
breakpoint_re_set ();
|
||
}
|
||
}
|
||
|
||
/* This function is really horrible, but to avoid it, there would need
|
||
to be more filling in of forward references. */
|
||
void
|
||
fill_in_vptr_fieldno (type)
|
||
struct type *type;
|
||
{
|
||
if (TYPE_VPTR_FIELDNO (type) < 0)
|
||
{
|
||
int i;
|
||
for (i = 1; i < TYPE_N_BASECLASSES (type); i++)
|
||
{
|
||
fill_in_vptr_fieldno (TYPE_BASECLASS (type, i));
|
||
if (TYPE_VPTR_FIELDNO (TYPE_BASECLASS (type, i)) >= 0)
|
||
{
|
||
TYPE_VPTR_FIELDNO (type)
|
||
= TYPE_VPTR_FIELDNO (TYPE_BASECLASS (type, i));
|
||
TYPE_VPTR_BASETYPE (type)
|
||
= TYPE_VPTR_BASETYPE (TYPE_BASECLASS (type, i));
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Functions to handle complaints during symbol reading. */
|
||
|
||
/* How many complaints about a particular thing should be printed before
|
||
we stop whining about it? */
|
||
|
||
static unsigned stop_whining = 1;
|
||
|
||
/* Print a complaint about the input symbols, and link the complaint block
|
||
into a chain for later handling. Result is 1 if the complaint was
|
||
printed, 0 if it was suppressed. */
|
||
|
||
int
|
||
complain (complaint, val)
|
||
struct complaint *complaint;
|
||
char *val;
|
||
{
|
||
complaint->counter++;
|
||
if (complaint->next == 0) {
|
||
complaint->next = complaint_root->next;
|
||
complaint_root->next = complaint;
|
||
}
|
||
if (complaint->counter > stop_whining)
|
||
return 0;
|
||
wrap_here ("");
|
||
if (!info_verbose) {
|
||
puts_filtered ("During symbol reading...");
|
||
}
|
||
printf_filtered (complaint->message, val);
|
||
puts_filtered ("...");
|
||
wrap_here("");
|
||
if (!info_verbose)
|
||
puts_filtered ("\n");
|
||
return 1;
|
||
}
|
||
|
||
/* Clear out all complaint counters that have ever been incremented. */
|
||
|
||
void
|
||
clear_complaints ()
|
||
{
|
||
struct complaint *p;
|
||
|
||
for (p = complaint_root->next; p != complaint_root; p = p->next)
|
||
p->counter = 0;
|
||
}
|
||
|
||
/* clear_symtab_users_once:
|
||
|
||
This function is run after symbol reading, or from a cleanup.
|
||
If an old symbol table was obsoleted, the old symbol table
|
||
has been blown away, but the other GDB data structures that may
|
||
reference it have not yet been cleared or re-directed. (The old
|
||
symtab was zapped, and the cleanup queued, in free_named_symtab()
|
||
below.)
|
||
|
||
This function can be queued N times as a cleanup, or called
|
||
directly; it will do all the work the first time, and then will be a
|
||
no-op until the next time it is queued. This works by bumping a
|
||
counter at queueing time. Much later when the cleanup is run, or at
|
||
the end of symbol processing (in case the cleanup is discarded), if
|
||
the queued count is greater than the "done-count", we do the work
|
||
and set the done-count to the queued count. If the queued count is
|
||
less than or equal to the done-count, we just ignore the call. This
|
||
is needed because reading a single .o file will often replace many
|
||
symtabs (one per .h file, for example), and we don't want to reset
|
||
the breakpoints N times in the user's face.
|
||
|
||
The reason we both queue a cleanup, and call it directly after symbol
|
||
reading, is because the cleanup protects us in case of errors, but is
|
||
discarded if symbol reading is successful. */
|
||
|
||
static int clear_symtab_users_queued;
|
||
static int clear_symtab_users_done;
|
||
|
||
static void
|
||
clear_symtab_users_once ()
|
||
{
|
||
/* Enforce once-per-`do_cleanups'-semantics */
|
||
if (clear_symtab_users_queued <= clear_symtab_users_done)
|
||
return;
|
||
clear_symtab_users_done = clear_symtab_users_queued;
|
||
|
||
printf ("Resetting debugger state after updating old symbol tables\n");
|
||
|
||
/* Someday, we should do better than this, by only blowing away
|
||
the things that really need to be blown. */
|
||
clear_value_history ();
|
||
clear_displays ();
|
||
clear_internalvars ();
|
||
breakpoint_re_set ();
|
||
set_default_breakpoint (0, 0, 0, 0);
|
||
current_source_symtab = 0;
|
||
}
|
||
|
||
/* Delete the specified psymtab, and any others that reference it. */
|
||
|
||
static void
|
||
cashier_psymtab (pst)
|
||
struct partial_symtab *pst;
|
||
{
|
||
struct partial_symtab *ps, *pprev;
|
||
int i;
|
||
|
||
/* Find its previous psymtab in the chain */
|
||
for (ps = partial_symtab_list; ps; ps = ps->next) {
|
||
if (ps == pst)
|
||
break;
|
||
pprev = ps;
|
||
}
|
||
|
||
if (ps) {
|
||
/* Unhook it from the chain. */
|
||
if (ps == partial_symtab_list)
|
||
partial_symtab_list = ps->next;
|
||
else
|
||
pprev->next = ps->next;
|
||
|
||
/* FIXME, we can't conveniently deallocate the entries in the
|
||
partial_symbol lists (global_psymbols/static_psymbols) that
|
||
this psymtab points to. These just take up space until all
|
||
the psymtabs are reclaimed. Ditto the dependencies list and
|
||
filename, which are all in the psymbol_obstack. */
|
||
|
||
/* We need to cashier any psymtab that has this one as a dependency... */
|
||
again:
|
||
for (ps = partial_symtab_list; ps; ps = ps->next) {
|
||
for (i = 0; i < ps->number_of_dependencies; i++) {
|
||
if (ps->dependencies[i] == pst) {
|
||
cashier_psymtab (ps);
|
||
goto again; /* Must restart, chain has been munged. */
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* If a symtab or psymtab for filename NAME is found, free it along
|
||
with any dependent breakpoints, displays, etc.
|
||
Used when loading new versions of object modules with the "add-file"
|
||
command. This is only called on the top-level symtab or psymtab's name;
|
||
it is not called for subsidiary files such as .h files.
|
||
|
||
Return value is 1 if we blew away the environment, 0 if not.
|
||
|
||
FIXME. I think this is not the best way to do this. We should
|
||
work on being gentler to the environment while still cleaning up
|
||
all stray pointers into the freed symtab. */
|
||
|
||
int
|
||
free_named_symtabs (name)
|
||
char *name;
|
||
{
|
||
register struct symtab *s;
|
||
register struct symtab *prev;
|
||
register struct partial_symtab *ps;
|
||
struct blockvector *bv;
|
||
int blewit = 0;
|
||
|
||
/* Some symbol formats have trouble providing file names... */
|
||
if (name == 0 || *name == '\0')
|
||
return 0;
|
||
|
||
/* Look for a psymtab with the specified name. */
|
||
|
||
again2:
|
||
for (ps = partial_symtab_list; ps; ps = ps->next) {
|
||
if (!strcmp (name, ps->filename)) {
|
||
cashier_psymtab (ps); /* Blow it away...and its little dog, too. */
|
||
goto again2; /* Must restart, chain has been munged */
|
||
}
|
||
}
|
||
|
||
/* Look for a symtab with the specified name. */
|
||
|
||
for (s = symtab_list; s; s = s->next)
|
||
{
|
||
if (!strcmp (name, s->filename))
|
||
break;
|
||
prev = s;
|
||
}
|
||
|
||
if (s)
|
||
{
|
||
if (s == symtab_list)
|
||
symtab_list = s->next;
|
||
else
|
||
prev->next = s->next;
|
||
|
||
/* For now, queue a delete for all breakpoints, displays, etc., whether
|
||
or not they depend on the symtab being freed. This should be
|
||
changed so that only those data structures affected are deleted. */
|
||
|
||
/* But don't delete anything if the symtab is empty.
|
||
This test is necessary due to a bug in "dbxread.c" that
|
||
causes empty symtabs to be created for N_SO symbols that
|
||
contain the pathname of the object file. (This problem
|
||
has been fixed in GDB 3.9x). */
|
||
|
||
bv = BLOCKLIST (s);
|
||
if (BLOCKLIST_NBLOCKS (bv) > 2
|
||
|| BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK))
|
||
|| BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK)))
|
||
{
|
||
complain (&oldsyms_complaint, name);
|
||
|
||
clear_symtab_users_queued++;
|
||
make_cleanup (clear_symtab_users_once, 0);
|
||
blewit = 1;
|
||
} else {
|
||
complain (&empty_symtab_complaint, name);
|
||
}
|
||
|
||
free_symtab (s);
|
||
}
|
||
else
|
||
/* It is still possible that some breakpoints will be affected
|
||
even though no symtab was found, since the file might have
|
||
been compiled without debugging, and hence not be associated
|
||
with a symtab. In order to handle this correctly, we would need
|
||
to keep a list of text address ranges for undebuggable files.
|
||
For now, we do nothing, since this is a fairly obscure case. */
|
||
;
|
||
|
||
/* FIXME, what about the misc function vector? */
|
||
return blewit;
|
||
}
|
||
|
||
void
|
||
_initialize_symfile ()
|
||
{
|
||
|
||
add_com ("symbol-file", class_files, symbol_file_command,
|
||
"Load symbol table from executable file FILE.\n\
|
||
The `file' command can also load symbol tables, as well as setting the file\n\
|
||
to execute.");
|
||
|
||
add_com ("add-symbol-file", class_files, add_symbol_file_command,
|
||
"Load the symbols from FILE, assuming FILE has been dynamically loaded.\n\
|
||
The second argument provides the starting address of the file's text.");
|
||
|
||
add_com ("load", class_files, load_command,
|
||
"Dynamically load FILE into the running program, and record its symbols\n\
|
||
for access from GDB.");
|
||
|
||
add_show_from_set
|
||
(add_set_cmd ("complaints", class_support, var_uinteger,
|
||
(char *)&stop_whining,
|
||
"Set max number of complaints about incorrect symbols.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
obstack_init (symbol_obstack);
|
||
obstack_init (psymbol_obstack);
|
||
}
|