588 lines
16 KiB
C
588 lines
16 KiB
C
/* Do various things to symbol tables (other than lookup)), for GDB.
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Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
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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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#ifndef lint
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static char rcsid[] = "$Id: symmisc.c,v 1.2 1993/08/02 17:41:11 mycroft Exp $";
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#endif /* not lint */
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#include "defs.h"
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#include "symtab.h"
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#include <stdio.h>
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#include <obstack.h>
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static void free_symtab ();
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/* Free all the symtabs that are currently installed,
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and all storage associated with them.
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Leaves us in a consistent state with no symtabs installed. */
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void
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free_all_symtabs ()
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{
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register struct symtab *s, *snext;
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/* All values will be invalid because their types will be! */
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clear_value_history ();
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clear_displays ();
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clear_internalvars ();
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clear_breakpoints ();
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set_default_breakpoint (0, 0, 0, 0);
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current_source_symtab = 0;
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for (s = symtab_list; s; s = snext)
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{
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snext = s->next;
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free_symtab (s);
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}
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symtab_list = 0;
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obstack_free (symbol_obstack, 0);
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obstack_init (symbol_obstack);
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if (misc_function_vector)
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free (misc_function_vector);
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misc_function_count = 0;
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misc_function_vector = 0;
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}
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/* Free a struct block <- B and all the symbols defined in that block. */
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static void
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free_symtab_block (b)
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struct block *b;
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{
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register int i, n;
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n = BLOCK_NSYMS (b);
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for (i = 0; i < n; i++)
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{
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free (SYMBOL_NAME (BLOCK_SYM (b, i)));
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free (BLOCK_SYM (b, i));
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}
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free (b);
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}
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/* Free all the storage associated with the struct symtab <- S.
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Note that some symtabs have contents malloc'ed structure by structure,
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while some have contents that all live inside one big block of memory,
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and some share the contents of another symbol table and so you should
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not free the contents on their behalf (except sometimes the linetable,
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which maybe per symtab even when the rest is not).
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It is s->free_code that says which alternative to use. */
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static void
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free_symtab (s)
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register struct symtab *s;
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{
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register int i, n;
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register struct blockvector *bv;
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register struct type *type;
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register struct typevector *tv;
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switch (s->free_code)
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{
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case free_nothing:
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/* All the contents are part of a big block of memory
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and some other symtab is in charge of freeing that block.
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Therefore, do nothing. */
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break;
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case free_contents:
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/* Here all the contents were malloc'ed structure by structure
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and must be freed that way. */
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/* First free the blocks (and their symbols. */
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bv = BLOCKVECTOR (s);
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n = BLOCKVECTOR_NBLOCKS (bv);
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for (i = 0; i < n; i++)
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free_symtab_block (BLOCKVECTOR_BLOCK (bv, i));
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/* Free the blockvector itself. */
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free (bv);
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/* Free the type vector. */
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tv = TYPEVECTOR (s);
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free (tv);
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/* Also free the linetable. */
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case free_linetable:
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/* Everything will be freed either by our `free_ptr'
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or by some other symbatb, except for our linetable.
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Free that now. */
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free (LINETABLE (s));
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break;
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}
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/* If there is a single block of memory to free, free it. */
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if (s->free_ptr)
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free (s->free_ptr);
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if (s->line_charpos)
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free (s->line_charpos);
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free (s->filename);
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free (s);
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}
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/* Convert a raw symbol-segment to a struct symtab,
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and relocate its internal pointers so that it is valid. */
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/* This is how to relocate one pointer, given a name for it.
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Works independent of the type of object pointed to. */
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#define RELOCATE(slot) (slot ? (* (char **) &slot += relocation) : 0)
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/* This is the inverse of RELOCATE. We use it when storing
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a core address into a slot that has yet to be relocated. */
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#define UNRELOCATE(slot) (slot ? (* (char **) &slot -= relocation) : 0)
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/* During the process of relocation, this holds the amount to relocate by
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(the address of the file's symtab data, in core in the debugger). */
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static int relocation;
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#define CORE_RELOCATE(slot) \
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((slot) += (((slot) < data_start) ? text_relocation \
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: ((slot) < bss_start) ? data_relocation : bss_relocation))
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#define TEXT_RELOCATE(slot) ((slot) += text_relocation)
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/* Relocation amounts for addresses in the program's core image. */
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static int text_relocation, data_relocation, bss_relocation;
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/* Boundaries that divide program core addresses into text, data and bss;
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used to determine which relocation amount to use. */
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static int data_start, bss_start;
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static void relocate_typevector ();
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static void relocate_blockvector ();
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static void relocate_type ();
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static void relocate_block ();
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static void relocate_symbol ();
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static void relocate_source ();
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/* Relocate a file's symseg so that all the pointers are valid C pointers.
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Value is a `struct symtab'; but it is not suitable for direct
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insertion into the `symtab_list' because it describes several files. */
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static struct symtab *
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relocate_symtab (root)
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struct symbol_root *root;
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{
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struct symtab *sp = (struct symtab *) xmalloc (sizeof (struct symtab));
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bzero (sp, sizeof (struct symtab));
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relocation = (int) root;
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text_relocation = root->textrel;
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data_relocation = root->datarel;
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bss_relocation = root->bssrel;
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data_start = root->databeg;
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bss_start = root->bssbeg;
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sp->filename = root->filename;
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sp->ldsymoff = root->ldsymoff;
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sp->language = root->language;
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sp->compilation = root->compilation;
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sp->version = root->version;
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sp->blockvector = root->blockvector;
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sp->typevector = root->typevector;
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RELOCATE (TYPEVECTOR (sp));
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RELOCATE (BLOCKVECTOR (sp));
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RELOCATE (sp->version);
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RELOCATE (sp->compilation);
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RELOCATE (sp->filename);
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relocate_typevector (TYPEVECTOR (sp));
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relocate_blockvector (BLOCKVECTOR (sp));
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return sp;
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}
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static void
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relocate_blockvector (blp)
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register struct blockvector *blp;
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{
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register int nblocks = BLOCKVECTOR_NBLOCKS (blp);
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register int i;
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for (i = 0; i < nblocks; i++)
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RELOCATE (BLOCKVECTOR_BLOCK (blp, i));
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for (i = 0; i < nblocks; i++)
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relocate_block (BLOCKVECTOR_BLOCK (blp, i));
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}
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static void
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relocate_block (bp)
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register struct block *bp;
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{
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register int nsyms = BLOCK_NSYMS (bp);
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register int i;
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TEXT_RELOCATE (BLOCK_START (bp));
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TEXT_RELOCATE (BLOCK_END (bp));
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/* These two should not be recursively processed.
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The superblock need not be because all blocks are
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processed from relocate_blockvector.
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The function need not be because it will be processed
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under the block which is its scope. */
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RELOCATE (BLOCK_SUPERBLOCK (bp));
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RELOCATE (BLOCK_FUNCTION (bp));
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for (i = 0; i < nsyms; i++)
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RELOCATE (BLOCK_SYM (bp, i));
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for (i = 0; i < nsyms; i++)
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relocate_symbol (BLOCK_SYM (bp, i));
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}
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static void
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relocate_symbol (sp)
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register struct symbol *sp;
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{
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RELOCATE (SYMBOL_NAME (sp));
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if (SYMBOL_CLASS (sp) == LOC_BLOCK)
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{
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RELOCATE (SYMBOL_BLOCK_VALUE (sp));
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/* We can assume the block that belongs to this symbol
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is not relocated yet, since it comes after
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the block that contains this symbol. */
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BLOCK_FUNCTION (SYMBOL_BLOCK_VALUE (sp)) = sp;
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UNRELOCATE (BLOCK_FUNCTION (SYMBOL_BLOCK_VALUE (sp)));
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}
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else if (SYMBOL_CLASS (sp) == LOC_STATIC)
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CORE_RELOCATE (SYMBOL_VALUE (sp));
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else if (SYMBOL_CLASS (sp) == LOC_LABEL)
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TEXT_RELOCATE (SYMBOL_VALUE (sp));
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RELOCATE (SYMBOL_TYPE (sp));
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}
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static void
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relocate_typevector (tv)
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struct typevector *tv;
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{
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register int ntypes = TYPEVECTOR_NTYPES (tv);
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register int i;
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for (i = 0; i < ntypes; i++)
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RELOCATE (TYPEVECTOR_TYPE (tv, i));
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for (i = 0; i < ntypes; i++)
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relocate_type (TYPEVECTOR_TYPE (tv, i));
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}
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/* We cannot come up with an a priori spanning tree
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for the network of types, since types can be used
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for many symbols and also as components of other types.
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Therefore, we need to be able to mark types that we
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already have relocated (or are already in the middle of relocating)
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as in a garbage collector. */
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static void
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relocate_type (tp)
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register struct type *tp;
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{
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register int nfields = TYPE_NFIELDS (tp);
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register int i;
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RELOCATE (TYPE_NAME (tp));
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RELOCATE (TYPE_TARGET_TYPE (tp));
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RELOCATE (TYPE_FIELDS (tp));
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RELOCATE (TYPE_POINTER_TYPE (tp));
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for (i = 0; i < nfields; i++)
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{
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RELOCATE (TYPE_FIELD_TYPE (tp, i));
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RELOCATE (TYPE_FIELD_NAME (tp, i));
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}
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}
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static void
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relocate_sourcevector (svp)
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register struct sourcevector *svp;
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{
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register int nfiles = svp->length;
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register int i;
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for (i = 0; i < nfiles; i++)
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RELOCATE (svp->source[i]);
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for (i = 0; i < nfiles; i++)
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relocate_source (svp->source[i]);
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}
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static void
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relocate_source (sp)
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register struct source *sp;
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{
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register int nitems = sp->contents.nitems;
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register int i;
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RELOCATE (sp->name);
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for (i = 0; i < nitems; i++)
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TEXT_RELOCATE (sp->contents.item[i].pc);
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}
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/* Read symsegs from file named NAME open on DESC,
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make symtabs from them, and return a chain of them.
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These symtabs are not suitable for direct use in `symtab_list'
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because each one describes a single object file, perhaps many source files.
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`symbol_file_command' takes each of these, makes many real symtabs
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from it, and then frees it.
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We assume DESC is prepositioned at the end of the string table,
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just before the symsegs if there are any. */
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struct symtab *
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read_symsegs (desc, name)
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int desc;
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char *name;
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{
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struct symbol_root root;
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register char *data;
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register struct symtab *sp, *sp1, *chain = 0;
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register int len;
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while (1)
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{
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len = myread (desc, &root, sizeof root);
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if (len == 0 || root.format == 0)
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break;
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/* format 1 was ok for the original gdb, but since the size of the
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type structure changed when C++ support was added, it can no
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longer be used. Accept only format 2. */
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if (root.format != 2 ||
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root.length < sizeof root)
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error ("\nInvalid symbol segment format code");
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data = (char *) xmalloc (root.length);
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bcopy (&root, data, sizeof root);
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len = myread (desc, data + sizeof root,
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root.length - sizeof root);
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sp = relocate_symtab (data);
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RELOCATE (((struct symbol_root *)data)->sourcevector);
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relocate_sourcevector (((struct symbol_root *)data)->sourcevector);
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sp->next = chain;
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chain = sp;
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sp->linetable = (struct linetable *) ((struct symbol_root *)data)->sourcevector;
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}
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return chain;
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}
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static int block_depth ();
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void print_spaces ();
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static void print_symbol ();
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void
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print_symtabs (filename)
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char *filename;
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{
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FILE *outfile;
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register struct symtab *s;
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register int i, j;
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int len, line, blen;
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register struct linetable *l;
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struct blockvector *bv;
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register struct block *b;
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int depth;
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struct cleanup *cleanups;
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extern int fclose();
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if (filename == 0)
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error_no_arg ("file to write symbol data in");
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filename = tilde_expand (filename);
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make_cleanup (free, filename);
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outfile = fopen (filename, "w");
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if (outfile == 0)
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perror_with_name (filename);
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cleanups = make_cleanup (fclose, outfile);
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immediate_quit++;
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for (s = symtab_list; s; s = s->next)
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{
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/* First print the line table. */
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fprintf (outfile, "Symtab for file %s\n\n", s->filename);
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fprintf (outfile, "Line table:\n\n");
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l = LINETABLE (s);
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len = l->nitems;
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for (i = 0; i < len; i++)
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fprintf (outfile, " line %d at %x\n", l->item[i].line,
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l->item[i].pc);
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/* Now print the block info. */
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fprintf (outfile, "\nBlockvector:\n\n");
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bv = BLOCKVECTOR (s);
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len = BLOCKVECTOR_NBLOCKS (bv);
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for (i = 0; i < len; i++)
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{
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b = BLOCKVECTOR_BLOCK (bv, i);
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depth = block_depth (b) * 2;
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print_spaces (depth, outfile);
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fprintf (outfile, "block #%03d (object 0x%x) ", i, b);
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fprintf (outfile, "[0x%x..0x%x]", BLOCK_START (b), BLOCK_END (b));
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if (BLOCK_SUPERBLOCK (b))
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fprintf (outfile, " (under 0x%x)", BLOCK_SUPERBLOCK (b));
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if (BLOCK_FUNCTION (b))
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fprintf (outfile, " %s", SYMBOL_NAME (BLOCK_FUNCTION (b)));
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fputc ('\n', outfile);
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blen = BLOCK_NSYMS (b);
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for (j = 0; j < blen; j++)
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{
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print_symbol (BLOCK_SYM (b, j), depth + 1, outfile);
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}
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}
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fprintf (outfile, "\n\n");
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}
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immediate_quit--;
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do_cleanups (cleanups);
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}
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static void
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print_symbol (symbol, depth, outfile)
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struct symbol *symbol;
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int depth;
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FILE *outfile;
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{
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print_spaces (depth, outfile);
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if (SYMBOL_NAMESPACE (symbol) == LABEL_NAMESPACE)
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{
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fprintf (outfile, "label %s at 0x%x\n", SYMBOL_NAME (symbol),
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SYMBOL_VALUE (symbol));
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return;
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}
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if (SYMBOL_NAMESPACE (symbol) == STRUCT_NAMESPACE)
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{
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if (TYPE_NAME (SYMBOL_TYPE (symbol)))
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{
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type_print_1 (SYMBOL_TYPE (symbol), "", outfile, 1, depth);
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}
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else
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{
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fprintf (outfile, "%s %s = ",
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(TYPE_CODE (SYMBOL_TYPE (symbol)) == TYPE_CODE_ENUM
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? "enum"
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: (TYPE_CODE (SYMBOL_TYPE (symbol)) == TYPE_CODE_STRUCT
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? "struct" : "union")),
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SYMBOL_NAME (symbol));
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type_print_1 (SYMBOL_TYPE (symbol), "", outfile, 1, depth);
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}
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fprintf (outfile, ";\n");
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}
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else
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{
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if (SYMBOL_CLASS (symbol) == LOC_TYPEDEF)
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fprintf (outfile, "typedef ");
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if (SYMBOL_TYPE (symbol))
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{
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type_print_1 (SYMBOL_TYPE (symbol), SYMBOL_NAME (symbol),
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outfile, 1, depth);
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fprintf (outfile, "; ");
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}
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else
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fprintf (outfile, "%s ", SYMBOL_NAME (symbol));
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switch (SYMBOL_CLASS (symbol))
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{
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case LOC_CONST:
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fprintf (outfile, "const %d (0x%x),",
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SYMBOL_VALUE (symbol), SYMBOL_VALUE (symbol));
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break;
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case LOC_CONST_BYTES:
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fprintf (outfile, "const %d hex bytes:",
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TYPE_LENGTH (SYMBOL_TYPE (symbol)));
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{
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int i;
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for (i = 0; i < TYPE_LENGTH (SYMBOL_TYPE (symbol)); i++)
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fprintf (outfile, " %2x", SYMBOL_VALUE_BYTES (symbol) [i]);
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fprintf (outfile, ",");
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}
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break;
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case LOC_STATIC:
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fprintf (outfile, "static at 0x%x,", SYMBOL_VALUE (symbol));
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break;
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case LOC_REGISTER:
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fprintf (outfile, "register %d,", SYMBOL_VALUE (symbol));
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break;
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case LOC_ARG:
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fprintf (outfile, "arg at 0x%x,", SYMBOL_VALUE (symbol));
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break;
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case LOC_REF_ARG:
|
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fprintf (outfile, "reference arg at 0x%x,", SYMBOL_VALUE (symbol));
|
||
break;
|
||
|
||
case LOC_REGPARM:
|
||
fprintf (outfile, "parameter register %d,", SYMBOL_VALUE (symbol));
|
||
break;
|
||
|
||
case LOC_LOCAL:
|
||
fprintf (outfile, "local at 0x%x,", SYMBOL_VALUE (symbol));
|
||
break;
|
||
|
||
case LOC_TYPEDEF:
|
||
break;
|
||
|
||
case LOC_LABEL:
|
||
fprintf (outfile, "label at 0x%x", SYMBOL_VALUE (symbol));
|
||
break;
|
||
|
||
case LOC_BLOCK:
|
||
fprintf (outfile, "block (object 0x%x) starting at 0x%x,",
|
||
SYMBOL_VALUE (symbol),
|
||
BLOCK_START (SYMBOL_BLOCK_VALUE (symbol)));
|
||
break;
|
||
}
|
||
}
|
||
fprintf (outfile, "\n");
|
||
}
|
||
|
||
/* Return the nexting depth of a block within other blocks in its symtab. */
|
||
|
||
static int
|
||
block_depth (block)
|
||
struct block *block;
|
||
{
|
||
register int i = 0;
|
||
while (block = BLOCK_SUPERBLOCK (block)) i++;
|
||
return i;
|
||
}
|
||
|
||
/*
|
||
* Free all partial_symtab storage.
|
||
*/
|
||
void
|
||
free_all_psymtabs()
|
||
{
|
||
obstack_free (psymbol_obstack, 0);
|
||
obstack_init (psymbol_obstack);
|
||
partial_symtab_list = (struct partial_symtab *) 0;
|
||
}
|
||
|
||
void
|
||
_initialize_symmisc ()
|
||
{
|
||
symtab_list = (struct symtab *) 0;
|
||
partial_symtab_list = (struct partial_symtab *) 0;
|
||
|
||
add_com ("printsyms", class_obscure, print_symtabs,
|
||
"Print dump of current symbol definitions to file OUTFILE.");
|
||
}
|
||
|