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https://github.com/darlinghq/darling-gdb.git
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4365c36c9b
Add objfile field. * objfiles.c (find_pc_section): Return a struct obj_section *. * sparc-tdep.c (in_solib_trampoline): Deal with find_pc_section return. * symfile.c (syms_from_objfile) [IBM6000_TARGET]: Don't use obj_section hack. * xcoffexec (vmap_symtab): Relocate obj_sections. * printcmd.c (containing_function_bounds): Use find_pc_section.
1392 lines
38 KiB
C
1392 lines
38 KiB
C
/* Generic symbol file reading for the GNU debugger, GDB.
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Copyright 1990, 1991, 1992, 1993 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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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
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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
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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 this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "symtab.h"
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#include "gdbtypes.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 "objfiles.h"
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#include "gdbcmd.h"
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#include "breakpoint.h"
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#include "language.h"
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#include "complaints.h"
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#include "demangle.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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#include <ctype.h>
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/* Global variables owned by this file */
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int readnow_symbol_files; /* Read full symbols immediately */
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struct complaint oldsyms_complaint = {
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"Replacing old symbols for `%s'", 0, 0
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};
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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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};
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/* External variables and functions referenced. */
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extern int info_verbose;
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/* Functions this file defines */
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static void
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set_initial_language PARAMS ((void));
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static void
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load_command PARAMS ((char *, int));
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static void
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add_symbol_file_command PARAMS ((char *, int));
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static void
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cashier_psymtab PARAMS ((struct partial_symtab *));
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static int
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compare_psymbols PARAMS ((const void *, const void *));
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static int
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compare_symbols PARAMS ((const void *, const void *));
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static bfd *
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symfile_bfd_open PARAMS ((char *));
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static void
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find_sym_fns PARAMS ((struct objfile *));
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void
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clear_symtab_users_once PARAMS ((void));
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/* List of all available sym_fns. On gdb startup, each object file reader
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calls add_symtab_fns() to register information on each format it is
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prepared to read. */
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static struct sym_fns *symtab_fns = NULL;
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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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/* Flag for whether user will be reloading symbols multiple times.
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Defaults to ON for VxWorks, otherwise OFF. */
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#ifdef SYMBOL_RELOADING_DEFAULT
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int symbol_reloading = SYMBOL_RELOADING_DEFAULT;
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#else
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int symbol_reloading = 0;
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#endif
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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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Since this function is called from within qsort, in an ANSI environment
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it must conform to the prototype for qsort, which specifies that the
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comparison function takes two "void *" pointers. */
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static int
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compare_symbols (s1p, s2p)
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const PTR s1p;
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const PTR s2p;
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{
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register struct symbol **s1, **s2;
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register int namediff;
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s1 = (struct symbol **) s1p;
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s2 = (struct symbol **) s2p;
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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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/*
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LOCAL FUNCTION
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compare_psymbols -- compare two partial symbols by name
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DESCRIPTION
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Given pointer to two partial symbol table entries, compare
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them by name and return -N, 0, or +N (ala strcmp). Typically
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used by sorting routines like qsort().
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NOTES
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Does direct compare of first two characters before punting
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and passing to strcmp for longer compares. Note that the
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original version had a bug whereby two null strings or two
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identically named one character strings would return the
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comparison of memory following the null byte.
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*/
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static int
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compare_psymbols (s1p, s2p)
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const PTR s1p;
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const PTR s2p;
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{
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register char *st1 = SYMBOL_NAME ((struct partial_symbol *) s1p);
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register char *st2 = SYMBOL_NAME ((struct partial_symbol *) s2p);
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if ((st1[0] - st2[0]) || !st1[0])
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{
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return (st1[0] - st2[0]);
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}
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else if ((st1[1] - st2[1]) || !st1[1])
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{
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return (st1[1] - st2[1]);
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}
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else
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{
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return (STRCMP (st1 + 2, st2 + 2));
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}
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}
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void
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sort_pst_symbols (pst)
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struct partial_symtab *pst;
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{
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/* Sort the global list; don't sort the static list */
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qsort (pst -> objfile -> global_psymbols.list + pst -> globals_offset,
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pst -> n_global_syms, sizeof (struct partial_symbol),
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compare_psymbols);
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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;
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int nbl;
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int i;
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register struct block *b;
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if (s == 0)
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return;
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bv = BLOCKVECTOR (s);
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nbl = BLOCKVECTOR_NBLOCKS (bv);
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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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register struct objfile *objfile;
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for (objfile = object_files; objfile != NULL; objfile = objfile -> next)
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{
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for (s = objfile -> symtabs; s != NULL; 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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}
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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, obstackp)
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char *ptr;
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int size;
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struct obstack *obstackp;
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{
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register char *p = (char *) obstack_alloc (obstackp, 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 (obstackp, s1, s2, s3)
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struct obstack *obstackp;
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const 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 (obstackp, 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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/* 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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/* 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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return pst->symtab;
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}
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/* Initialize entry point information for this objfile. */
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void
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init_entry_point_info (objfile)
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struct objfile *objfile;
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{
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/* Save startup file's range of PC addresses to help blockframe.c
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decide where the bottom of the stack is. */
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if (bfd_get_file_flags (objfile -> obfd) & EXEC_P)
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{
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/* Executable file -- record its entry point so we'll recognize
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the startup file because it contains the entry point. */
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objfile -> ei.entry_point = bfd_get_start_address (objfile -> obfd);
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}
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else
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{
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/* Examination of non-executable.o files. Short-circuit this stuff. */
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/* ~0 will not be in any file, we hope. */
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objfile -> ei.entry_point = ~0;
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/* set the startup file to be an empty range. */
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objfile -> ei.entry_file_lowpc = 0;
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objfile -> ei.entry_file_highpc = 0;
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}
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}
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/* Remember the lowest-addressed loadable section we've seen.
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This function is called via bfd_map_over_sections. */
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#if 0 /* Not used yet */
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static void
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find_lowest_section (abfd, sect, obj)
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bfd *abfd;
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asection *sect;
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PTR obj;
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{
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asection **lowest = (asection **)obj;
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if (0 == (bfd_get_section_flags (abfd, sect) & SEC_LOAD))
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return;
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if (!*lowest)
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*lowest = sect; /* First loadable section */
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else if (bfd_section_vma (abfd, *lowest) >= bfd_section_vma (abfd, sect))
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*lowest = sect; /* A lower loadable section */
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}
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#endif
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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. If VERBO, the caller has printed
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a verbose message about the symbol reading (and complaints can be
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more terse about it). */
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void
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syms_from_objfile (objfile, addr, mainline, verbo)
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struct objfile *objfile;
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CORE_ADDR addr;
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int mainline;
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int verbo;
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{
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struct section_offsets *section_offsets;
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asection *lowest_sect;
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init_entry_point_info (objfile);
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find_sym_fns (objfile);
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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_objfile != NULL)
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{
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free_objfile (symfile_objfile);
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symfile_objfile = NULL;
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}
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(*objfile -> sf -> sym_new_init) (objfile);
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}
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/* Convert addr into an offset rather than an absolute address.
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We find the lowest address of a loaded segment in the objfile,
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and assume that <addr> is where that got loaded. Due to historical
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precedent, we warn if that doesn't happen to be the ".text"
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segment. */
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if (mainline)
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{
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addr = 0; /* No offset from objfile addresses. */
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}
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else
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{
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lowest_sect = bfd_get_section_by_name (objfile->obfd, ".text");
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#if 0
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lowest_sect = 0;
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bfd_map_over_sections (objfile->obfd, find_lowest_section,
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(PTR) &lowest_sect);
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#endif
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if (lowest_sect == 0)
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warning ("no loadable sections found in added symbol-file %s",
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objfile->name);
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else if (0 == bfd_get_section_name (objfile->obfd, lowest_sect)
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|| !STREQ (".text",
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bfd_get_section_name (objfile->obfd, lowest_sect)))
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warning ("Lowest section in %s is %s at 0x%x",
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objfile->name,
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bfd_section_name (objfile->obfd, lowest_sect),
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bfd_section_vma (objfile->obfd, lowest_sect));
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if (lowest_sect)
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addr -= bfd_section_vma (objfile->obfd, lowest_sect);
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}
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/* Initialize symbol reading routines for this objfile, allow complaints to
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appear for this new file, and record how verbose to be, then do the
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initial symbol reading for this file. */
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(*objfile -> sf -> sym_init) (objfile);
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clear_complaints (1, verbo);
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/* If objfile->sf->sym_offsets doesn't set this, we don't care
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(currently). */
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objfile->num_sections = 0; /* krp-FIXME: why zero? */
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section_offsets = (*objfile -> sf -> sym_offsets) (objfile, addr);
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objfile->section_offsets = section_offsets;
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#ifndef IBM6000_TARGET
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/* This is a SVR4/SunOS specific hack, I think. In any event, it
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screws RS/6000. sym_offsets should be doing this sort of thing,
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because it knows the mapping between bfd sections and
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section_offsets. */
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/* This is a hack. As far as I can tell, section offsets are not
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target dependent. They are all set to addr with a couple of
|
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exceptions. The exceptions are sysvr4 shared libraries, whose
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offsets are kept in solib structures anyway and rs6000 xcoff
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which handles shared libraries in a completely unique way.
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Section offsets are built similarly, except that they are built
|
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by adding addr in all cases because there is no clear mapping
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from section_offsets into actual sections. Note that solib.c
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has a different algorythm for finding section offsets.
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These should probably all be collapsed into some target
|
||
independent form of shared library support. FIXME. */
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|
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if (addr)
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{
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struct obj_section *s;
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|
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for (s = objfile->sections; s < objfile->sections_end; ++s)
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{
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s->addr -= s->offset;
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s->addr += addr;
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s->endaddr -= s->offset;
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s->endaddr += addr;
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s->offset += addr;
|
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}
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||
}
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#endif /* not IBM6000_TARGET */
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(*objfile -> sf -> sym_read) (objfile, section_offsets, mainline);
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|
||
/* Don't allow char * to have a typename (else would get caddr_t.) */
|
||
/* Ditto void *. FIXME should do this for all the builtin types. */
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|
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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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||
|
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/* Mark the objfile has having had initial symbol read attempted. Note
|
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that this does not mean we found any symbols... */
|
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|
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objfile -> flags |= OBJF_SYMS;
|
||
}
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||
|
||
/* Perform required actions immediately after either reading in the initial
|
||
symbols for a new objfile, or mapping in the symbols from a reusable
|
||
objfile. */
|
||
|
||
void
|
||
new_symfile_objfile (objfile, mainline, verbo)
|
||
struct objfile *objfile;
|
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int mainline;
|
||
int verbo;
|
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{
|
||
if (mainline)
|
||
{
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/* OK, make it the "real" symbol file. */
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symfile_objfile = objfile;
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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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||
|
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/* We're done reading the symbol file; finish off complaints. */
|
||
clear_complaints (0, verbo);
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|
||
/* Fixup all the breakpoints that may have been redefined by this
|
||
symbol file. */
|
||
|
||
breakpoint_re_set ();
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||
}
|
||
|
||
/* Process a symbol file, as either the main file or as a dynamically
|
||
loaded file.
|
||
|
||
NAME is the file name (which will be tilde-expanded and made
|
||
absolute herein) (but we don't free or modify NAME itself).
|
||
FROM_TTY says how verbose to be. MAINLINE specifies whether this
|
||
is the main symbol file, or whether it's an extra symbol file such
|
||
as dynamically loaded code. If !mainline, ADDR is the address
|
||
where the text segment was loaded.
|
||
|
||
Upon success, returns a pointer to the objfile that was added.
|
||
Upon failure, jumps back to command level (never returns). */
|
||
|
||
struct objfile *
|
||
symbol_file_add (name, from_tty, addr, mainline, mapped, readnow)
|
||
char *name;
|
||
int from_tty;
|
||
CORE_ADDR addr;
|
||
int mainline;
|
||
int mapped;
|
||
int readnow;
|
||
{
|
||
struct objfile *objfile;
|
||
struct partial_symtab *psymtab;
|
||
bfd *abfd;
|
||
|
||
/* Open a bfd for the file, and give user a chance to burp if we'd be
|
||
interactively wiping out any existing symbols. */
|
||
|
||
abfd = symfile_bfd_open (name);
|
||
|
||
if ((have_full_symbols () || have_partial_symbols ())
|
||
&& mainline
|
||
&& from_tty
|
||
&& !query ("Load new symbol table from \"%s\"? ", name))
|
||
error ("Not confirmed.");
|
||
|
||
/* Getting new symbols may change our opinion about what is
|
||
frameless. */
|
||
|
||
reinit_frame_cache ();
|
||
|
||
objfile = allocate_objfile (abfd, mapped);
|
||
|
||
/* If the objfile uses a mapped symbol file, and we have a psymtab for
|
||
it, then skip reading any symbols at this time. */
|
||
|
||
if ((objfile -> flags & OBJF_MAPPED) && (objfile -> flags & OBJF_SYMS))
|
||
{
|
||
/* We mapped in an existing symbol table file that already has had
|
||
initial symbol reading performed, so we can skip that part. Notify
|
||
the user that instead of reading the symbols, they have been mapped.
|
||
*/
|
||
if (from_tty || info_verbose)
|
||
{
|
||
printf_filtered ("Mapped symbols for %s...", name);
|
||
wrap_here ("");
|
||
fflush (stdout);
|
||
}
|
||
init_entry_point_info (objfile);
|
||
find_sym_fns (objfile);
|
||
}
|
||
else
|
||
{
|
||
/* We either created a new mapped symbol table, mapped an existing
|
||
symbol table file which has not had initial symbol reading
|
||
performed, or need to read an unmapped symbol table. */
|
||
if (from_tty || info_verbose)
|
||
{
|
||
printf_filtered ("Reading symbols from %s...", name);
|
||
wrap_here ("");
|
||
fflush (stdout);
|
||
}
|
||
syms_from_objfile (objfile, addr, mainline, from_tty);
|
||
}
|
||
|
||
new_symfile_objfile (objfile, mainline, from_tty);
|
||
|
||
/* We now have at least a partial symbol table. Check to see if the
|
||
user requested that all symbols be read on initial access via either
|
||
the gdb startup command line or on a per symbol file basis. Expand
|
||
all partial symbol tables for this objfile if so. */
|
||
|
||
if (readnow || readnow_symbol_files)
|
||
{
|
||
if (from_tty || info_verbose)
|
||
{
|
||
printf_filtered ("expanding to full symbols...");
|
||
wrap_here ("");
|
||
fflush (stdout);
|
||
}
|
||
|
||
for (psymtab = objfile -> psymtabs;
|
||
psymtab != NULL;
|
||
psymtab = psymtab -> next)
|
||
{
|
||
psymtab_to_symtab (psymtab);
|
||
}
|
||
}
|
||
|
||
if (from_tty || info_verbose)
|
||
{
|
||
printf_filtered ("done.\n");
|
||
fflush (stdout);
|
||
}
|
||
|
||
return (objfile);
|
||
}
|
||
|
||
/* This is the symbol-file command. Read the file, analyze its symbols,
|
||
and add a struct symtab to a symtab list. */
|
||
|
||
void
|
||
symbol_file_command (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
char **argv;
|
||
char *name = NULL;
|
||
struct cleanup *cleanups;
|
||
int mapped = 0;
|
||
int readnow = 0;
|
||
|
||
dont_repeat ();
|
||
|
||
if (args == NULL)
|
||
{
|
||
if ((have_full_symbols () || have_partial_symbols ())
|
||
&& from_tty
|
||
&& !query ("Discard symbol table from `%s'? ",
|
||
symfile_objfile -> name))
|
||
error ("Not confirmed.");
|
||
free_all_objfiles ();
|
||
symfile_objfile = NULL;
|
||
current_source_symtab = NULL;
|
||
current_source_line = 0;
|
||
if (from_tty)
|
||
{
|
||
printf ("No symbol file now.\n");
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if ((argv = buildargv (args)) == NULL)
|
||
{
|
||
nomem (0);
|
||
}
|
||
cleanups = make_cleanup (freeargv, (char *) argv);
|
||
while (*argv != NULL)
|
||
{
|
||
if (STREQ (*argv, "-mapped"))
|
||
{
|
||
mapped = 1;
|
||
}
|
||
else if (STREQ (*argv, "-readnow"))
|
||
{
|
||
readnow = 1;
|
||
}
|
||
else if (**argv == '-')
|
||
{
|
||
error ("unknown option `%s'", *argv);
|
||
}
|
||
else
|
||
{
|
||
name = *argv;
|
||
}
|
||
argv++;
|
||
}
|
||
|
||
if (name == NULL)
|
||
{
|
||
error ("no symbol file name was specified");
|
||
}
|
||
else
|
||
{
|
||
symbol_file_add (name, from_tty, (CORE_ADDR)0, 1, mapped, readnow);
|
||
set_initial_language ();
|
||
}
|
||
do_cleanups (cleanups);
|
||
}
|
||
}
|
||
|
||
/* Set the initial language.
|
||
|
||
A better solution would be to record the language in the psymtab when reading
|
||
partial symbols, and then use it (if known) to set the language. This would
|
||
be a win for formats that encode the language in an easily discoverable place,
|
||
such as DWARF. For stabs, we can jump through hoops looking for specially
|
||
named symbols or try to intuit the language from the specific type of stabs
|
||
we find, but we can't do that until later when we read in full symbols.
|
||
FIXME. */
|
||
|
||
static void
|
||
set_initial_language ()
|
||
{
|
||
struct partial_symtab *pst;
|
||
enum language lang = language_unknown;
|
||
|
||
pst = find_main_psymtab ();
|
||
if (pst != NULL)
|
||
{
|
||
if (pst -> filename != NULL)
|
||
{
|
||
lang = deduce_language_from_filename (pst -> filename);
|
||
}
|
||
if (lang == language_unknown)
|
||
{
|
||
/* Make C the default language */
|
||
lang = language_c;
|
||
}
|
||
set_language (lang);
|
||
expected_language = current_language; /* Don't warn the user */
|
||
}
|
||
}
|
||
|
||
/* Open file specified by NAME and hand it off to BFD for preliminary
|
||
analysis. Result is a newly initialized bfd *, which includes a newly
|
||
malloc'd` copy of NAME (tilde-expanded and made absolute).
|
||
In case of trouble, error() is called. */
|
||
|
||
static bfd *
|
||
symfile_bfd_open (name)
|
||
char *name;
|
||
{
|
||
bfd *sym_bfd;
|
||
int desc;
|
||
char *absolute_name;
|
||
|
||
name = tilde_expand (name); /* Returns 1st new malloc'd copy */
|
||
|
||
/* Look down path for it, allocate 2nd new malloc'd copy. */
|
||
desc = openp (getenv ("PATH"), 1, name, O_RDONLY | O_BINARY, 0, &absolute_name);
|
||
if (desc < 0)
|
||
{
|
||
make_cleanup (free, name);
|
||
perror_with_name (name);
|
||
}
|
||
free (name); /* Free 1st new malloc'd copy */
|
||
name = absolute_name; /* Keep 2nd malloc'd copy in bfd */
|
||
/* It'll be freed in free_objfile(). */
|
||
|
||
sym_bfd = bfd_fdopenr (name, NULL, desc);
|
||
if (!sym_bfd)
|
||
{
|
||
close (desc);
|
||
make_cleanup (free, name);
|
||
error ("\"%s\": can't open to read symbols: %s.", name,
|
||
bfd_errmsg (bfd_error));
|
||
}
|
||
sym_bfd->cacheable = true;
|
||
|
||
if (!bfd_check_format (sym_bfd, bfd_object))
|
||
{
|
||
bfd_close (sym_bfd); /* This also closes desc */
|
||
make_cleanup (free, name);
|
||
error ("\"%s\": can't read symbols: %s.", name,
|
||
bfd_errmsg (bfd_error));
|
||
}
|
||
|
||
return (sym_bfd);
|
||
}
|
||
|
||
/* Link a new symtab_fns into the global symtab_fns list. Called on gdb
|
||
startup by the _initialize routine in each object file format reader,
|
||
to register information about each format the the reader is prepared
|
||
to handle. */
|
||
|
||
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 an initialized struct sym_fns
|
||
in the objfile structure, that contains cached information about the
|
||
symbol file. */
|
||
|
||
static void
|
||
find_sym_fns (objfile)
|
||
struct objfile *objfile;
|
||
{
|
||
struct sym_fns *sf;
|
||
|
||
for (sf = symtab_fns; sf != NULL; sf = sf -> next)
|
||
{
|
||
if (strncmp (bfd_get_target (objfile -> obfd),
|
||
sf -> sym_name, sf -> sym_namelen) == 0)
|
||
{
|
||
objfile -> sf = sf;
|
||
return;
|
||
}
|
||
}
|
||
error ("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown.",
|
||
bfd_get_target (objfile -> obfd));
|
||
}
|
||
|
||
/* This function runs the load command of our current target. */
|
||
|
||
static void
|
||
load_command (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
target_load (arg, from_tty);
|
||
}
|
||
|
||
/* This function allows the addition of incrementally linked object files.
|
||
It does not modify any state in the target, only in the debugger. */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
add_symbol_file_command (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
char *name = NULL;
|
||
CORE_ADDR text_addr;
|
||
char *arg;
|
||
int readnow = 0;
|
||
int mapped = 0;
|
||
|
||
dont_repeat ();
|
||
|
||
if (args == NULL)
|
||
{
|
||
error ("add-symbol-file takes a file name and an address");
|
||
}
|
||
|
||
/* Make a copy of the string that we can safely write into. */
|
||
|
||
args = strdup (args);
|
||
make_cleanup (free, args);
|
||
|
||
/* Pick off any -option args and the file name. */
|
||
|
||
while ((*args != '\000') && (name == NULL))
|
||
{
|
||
while (isspace (*args)) {args++;}
|
||
arg = args;
|
||
while ((*args != '\000') && !isspace (*args)) {args++;}
|
||
if (*args != '\000')
|
||
{
|
||
*args++ = '\000';
|
||
}
|
||
if (*arg != '-')
|
||
{
|
||
name = arg;
|
||
}
|
||
else if (STREQ (arg, "-mapped"))
|
||
{
|
||
mapped = 1;
|
||
}
|
||
else if (STREQ (arg, "-readnow"))
|
||
{
|
||
readnow = 1;
|
||
}
|
||
else
|
||
{
|
||
error ("unknown option `%s'", arg);
|
||
}
|
||
}
|
||
|
||
/* After picking off any options and the file name, args should be
|
||
left pointing at the remainder of the command line, which should
|
||
be the address expression to evaluate. */
|
||
|
||
if ((name == NULL) || (*args == '\000') )
|
||
{
|
||
error ("add-symbol-file takes a file name and an address");
|
||
}
|
||
name = tilde_expand (name);
|
||
make_cleanup (free, name);
|
||
|
||
text_addr = parse_and_eval_address (args);
|
||
|
||
if (!query ("add symbol table from file \"%s\" at text_addr = %s?\n",
|
||
name, local_hex_string (text_addr)))
|
||
error ("Not confirmed.");
|
||
|
||
symbol_file_add (name, 0, text_addr, 0, mapped, readnow);
|
||
}
|
||
|
||
/* Re-read symbols if a symbol-file has changed. */
|
||
void
|
||
reread_symbols ()
|
||
{
|
||
struct objfile *objfile;
|
||
long new_modtime;
|
||
int reread_one = 0;
|
||
struct stat new_statbuf;
|
||
int res;
|
||
|
||
/* 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 */
|
||
|
||
the_big_top:
|
||
for (objfile = object_files; objfile; objfile = objfile->next) {
|
||
if (objfile->obfd) {
|
||
#ifdef IBM6000_TARGET
|
||
/* If this object is from a shared library, then you should
|
||
stat on the library name, not member name. */
|
||
|
||
if (objfile->obfd->my_archive)
|
||
res = stat (objfile->obfd->my_archive->filename, &new_statbuf);
|
||
else
|
||
#endif
|
||
res = stat (objfile->name, &new_statbuf);
|
||
if (res != 0) {
|
||
/* FIXME, should use print_sys_errmsg but it's not filtered. */
|
||
printf_filtered ("`%s' has disappeared; keeping its symbols.\n",
|
||
objfile->name);
|
||
continue;
|
||
}
|
||
new_modtime = new_statbuf.st_mtime;
|
||
if (new_modtime != objfile->mtime) {
|
||
printf_filtered ("`%s' has changed; re-reading symbols.\n",
|
||
objfile->name);
|
||
/* FIXME, this should use a different command...that would only
|
||
affect this objfile's symbols, and would reset objfile->mtime.
|
||
(objfile->mtime = new_modtime;)
|
||
HOWEVER, that command isn't written yet -- so call symbol_file_
|
||
command, and restart the scan from the top, because it munges
|
||
the object_files list. */
|
||
symbol_file_command (objfile->name, 0);
|
||
reread_one = 1;
|
||
goto the_big_top; /* Start over. */
|
||
}
|
||
}
|
||
}
|
||
|
||
if (reread_one)
|
||
breakpoint_re_set ();
|
||
}
|
||
|
||
|
||
enum language
|
||
deduce_language_from_filename (filename)
|
||
char *filename;
|
||
{
|
||
char *c;
|
||
|
||
if (0 == filename)
|
||
; /* Get default */
|
||
else if (0 == (c = strrchr (filename, '.')))
|
||
; /* Get default. */
|
||
else if(STREQ(c,".mod"))
|
||
return language_m2;
|
||
else if(STREQ(c,".c"))
|
||
return language_c;
|
||
else if(STREQ(c,".cc") || STREQ(c,".C"))
|
||
return language_cplus;
|
||
else if(STREQ(c,".ch") || STREQ(c,".c186") || STREQ(c,".c286"))
|
||
return language_chill;
|
||
|
||
return language_unknown; /* default */
|
||
}
|
||
|
||
/* allocate_symtab:
|
||
|
||
Allocate and partly initialize a new symbol table. Return a pointer
|
||
to it. error() if no space.
|
||
|
||
Caller must set these fields:
|
||
LINETABLE(symtab)
|
||
symtab->blockvector
|
||
symtab->dirname
|
||
symtab->free_code
|
||
symtab->free_ptr
|
||
initialize any EXTRA_SYMTAB_INFO
|
||
possibly free_named_symtabs (symtab->filename);
|
||
*/
|
||
|
||
struct symtab *
|
||
allocate_symtab (filename, objfile)
|
||
char *filename;
|
||
struct objfile *objfile;
|
||
{
|
||
register struct symtab *symtab;
|
||
|
||
symtab = (struct symtab *)
|
||
obstack_alloc (&objfile -> symbol_obstack, sizeof (struct symtab));
|
||
memset (symtab, 0, sizeof (*symtab));
|
||
symtab -> filename = obsavestring (filename, strlen (filename),
|
||
&objfile -> symbol_obstack);
|
||
symtab -> fullname = NULL;
|
||
symtab -> language = deduce_language_from_filename (filename);
|
||
|
||
/* Hook it to the objfile it comes from */
|
||
|
||
symtab -> objfile = objfile;
|
||
symtab -> next = objfile -> symtabs;
|
||
objfile -> symtabs = symtab;
|
||
|
||
#ifdef INIT_EXTRA_SYMTAB_INFO
|
||
INIT_EXTRA_SYMTAB_INFO (symtab);
|
||
#endif
|
||
|
||
return (symtab);
|
||
}
|
||
|
||
struct partial_symtab *
|
||
allocate_psymtab (filename, objfile)
|
||
char *filename;
|
||
struct objfile *objfile;
|
||
{
|
||
struct partial_symtab *psymtab;
|
||
|
||
if (objfile -> free_psymtabs)
|
||
{
|
||
psymtab = objfile -> free_psymtabs;
|
||
objfile -> free_psymtabs = psymtab -> next;
|
||
}
|
||
else
|
||
psymtab = (struct partial_symtab *)
|
||
obstack_alloc (&objfile -> psymbol_obstack,
|
||
sizeof (struct partial_symtab));
|
||
|
||
memset (psymtab, 0, sizeof (struct partial_symtab));
|
||
psymtab -> filename = obsavestring (filename, strlen (filename),
|
||
&objfile -> psymbol_obstack);
|
||
psymtab -> symtab = NULL;
|
||
|
||
/* Hook it to the objfile it comes from */
|
||
|
||
psymtab -> objfile = objfile;
|
||
psymtab -> next = objfile -> psymtabs;
|
||
objfile -> psymtabs = psymtab;
|
||
|
||
return (psymtab);
|
||
}
|
||
|
||
|
||
/* 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;
|
||
|
||
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 = pst->objfile->psymtabs; ps; ps = ps->next) {
|
||
if (ps == pst)
|
||
break;
|
||
pprev = ps;
|
||
}
|
||
|
||
if (ps) {
|
||
/* Unhook it from the chain. */
|
||
if (ps == pst->objfile->psymtabs)
|
||
pst->objfile->psymtabs = 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 = pst->objfile->psymtabs; 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. The return valu appears to never be used.
|
||
|
||
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;
|
||
{
|
||
#if 0
|
||
/* FIXME: With the new method of each objfile having it's own
|
||
psymtab list, this function needs serious rethinking. In particular,
|
||
why was it ever necessary to toss psymtabs with specific compilation
|
||
unit filenames, as opposed to all psymtabs from a particular symbol
|
||
file? -- fnf
|
||
Well, the answer is that some systems permit reloading of particular
|
||
compilation units. We want to blow away any old info about these
|
||
compilation units, regardless of which objfiles they arrived in. --gnu. */
|
||
|
||
register struct symtab *s;
|
||
register struct symtab *prev;
|
||
register struct partial_symtab *ps;
|
||
struct blockvector *bv;
|
||
int blewit = 0;
|
||
|
||
/* We only wack things if the symbol-reload switch is set. */
|
||
if (!symbol_reloading)
|
||
return 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 (STREQ (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 (STREQ (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 = BLOCKVECTOR (s);
|
||
if (BLOCKVECTOR_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 minimal symbol table? */
|
||
return blewit;
|
||
#else
|
||
return (0);
|
||
#endif
|
||
}
|
||
|
||
/* Allocate and partially fill a partial symtab. It will be
|
||
completely filled at the end of the symbol list.
|
||
|
||
SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
|
||
is the address relative to which its symbols are (incremental) or 0
|
||
(normal). */
|
||
|
||
|
||
struct partial_symtab *
|
||
start_psymtab_common (objfile, section_offsets,
|
||
filename, textlow, global_syms, static_syms)
|
||
struct objfile *objfile;
|
||
struct section_offsets *section_offsets;
|
||
char *filename;
|
||
CORE_ADDR textlow;
|
||
struct partial_symbol *global_syms;
|
||
struct partial_symbol *static_syms;
|
||
{
|
||
struct partial_symtab *psymtab;
|
||
|
||
psymtab = allocate_psymtab (filename, objfile);
|
||
psymtab -> section_offsets = section_offsets;
|
||
psymtab -> textlow = textlow;
|
||
psymtab -> texthigh = psymtab -> textlow; /* default */
|
||
psymtab -> globals_offset = global_syms - objfile -> global_psymbols.list;
|
||
psymtab -> statics_offset = static_syms - objfile -> static_psymbols.list;
|
||
return (psymtab);
|
||
}
|
||
|
||
/* Debugging versions of functions that are usually inline macros
|
||
(see symfile.h). */
|
||
|
||
#if !INLINE_ADD_PSYMBOL
|
||
|
||
/* Add a symbol with a long value to a psymtab.
|
||
Since one arg is a struct, we pass in a ptr and deref it (sigh). */
|
||
|
||
void
|
||
add_psymbol_to_list (name, namelength, namespace, class, list, val, language,
|
||
objfile)
|
||
char *name;
|
||
int namelength;
|
||
enum namespace namespace;
|
||
enum address_class class;
|
||
struct psymbol_allocation_list *list;
|
||
long val;
|
||
enum language language;
|
||
struct objfile *objfile;
|
||
{
|
||
register struct partial_symbol *psym;
|
||
register char *demangled_name;
|
||
|
||
if (list->next >= list->list + list->size)
|
||
{
|
||
extend_psymbol_list (list,objfile);
|
||
}
|
||
psym = list->next++;
|
||
|
||
SYMBOL_NAME (psym) =
|
||
(char *) obstack_alloc (&objfile->psymbol_obstack, namelength + 1);
|
||
memcpy (SYMBOL_NAME (psym), name, namelength);
|
||
SYMBOL_NAME (psym)[namelength] = '\0';
|
||
SYMBOL_VALUE (psym) = val;
|
||
SYMBOL_LANGUAGE (psym) = language;
|
||
PSYMBOL_NAMESPACE (psym) = namespace;
|
||
PSYMBOL_CLASS (psym) = class;
|
||
SYMBOL_INIT_DEMANGLED_NAME (psym, &objfile->psymbol_obstack);
|
||
}
|
||
|
||
/* Add a symbol with a CORE_ADDR value to a psymtab. */
|
||
|
||
void
|
||
add_psymbol_addr_to_list (name, namelength, namespace, class, list, val,
|
||
language, objfile)
|
||
char *name;
|
||
int namelength;
|
||
enum namespace namespace;
|
||
enum address_class class;
|
||
struct psymbol_allocation_list *list;
|
||
CORE_ADDR val;
|
||
enum language language;
|
||
struct objfile *objfile;
|
||
{
|
||
register struct partial_symbol *psym;
|
||
register char *demangled_name;
|
||
|
||
if (list->next >= list->list + list->size)
|
||
{
|
||
extend_psymbol_list (list,objfile);
|
||
}
|
||
psym = list->next++;
|
||
|
||
SYMBOL_NAME (psym) =
|
||
(char *) obstack_alloc (&objfile->psymbol_obstack, namelength + 1);
|
||
memcpy (SYMBOL_NAME (psym), name, namelength);
|
||
SYMBOL_NAME (psym)[namelength] = '\0';
|
||
SYMBOL_VALUE_ADDRESS (psym) = val;
|
||
SYMBOL_LANGUAGE (psym) = language;
|
||
PSYMBOL_NAMESPACE (psym) = namespace;
|
||
PSYMBOL_CLASS (psym) = class;
|
||
SYMBOL_INIT_DEMANGLED_NAME (psym, &objfile->psymbol_obstack);
|
||
}
|
||
|
||
#endif /* !INLINE_ADD_PSYMBOL */
|
||
|
||
|
||
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 ("symbol-reloading", class_support, var_boolean,
|
||
(char *)&symbol_reloading,
|
||
"Set dynamic symbol table reloading multiple times in one run.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
}
|