443 lines
9.7 KiB
C
443 lines
9.7 KiB
C
/* Copyright (C) 1991 Free Software Foundation, Inc.
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This file is part of GLD, the Gnu Linker.
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GLD 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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GLD 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 GLD; 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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/*
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* $Id$
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*
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*
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*/
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/*
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Written by Steve Chamberlain steve@cygnus.com
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All symbol handling for the linker
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*/
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#include "sysdep.h"
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#include "bfd.h"
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#include "ld.h"
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#include "ldsym.h"
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#include "ldmisc.h"
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#include "ldlang.h"
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/* IMPORT */
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extern bfd *output_bfd;
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extern strip_symbols_type strip_symbols;
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extern discard_locals_type discard_locals;
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/* Head and tail of global symbol table chronological list */
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ldsym_type *symbol_head = (ldsym_type *)NULL;
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ldsym_type **symbol_tail_ptr = &symbol_head;
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/*
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incremented for each symbol in the ldsym_type table
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no matter what flavour it is
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*/
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unsigned int global_symbol_count;
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/* IMPORTS */
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extern boolean option_longmap ;
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/* LOCALS */
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#define TABSIZE 1009
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static ldsym_type *global_symbol_hash_table[TABSIZE];
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/* Compute the hash code for symbol name KEY. */
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int
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hash_string (key)
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char *key;
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{
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register char *cp;
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register int k;
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cp = key;
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k = 0;
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while (*cp)
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k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
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return k;
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}
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/* Get the symbol table entry for the global symbol named KEY.
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Create one if there is none. */
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ldsym_type *
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DEFUN(ldsym_get,(key),
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CONST char *key)
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{
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register int hashval;
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register ldsym_type *bp;
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/* Determine the proper bucket. */
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hashval = hash_string (key) % TABSIZE;
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/* Search the bucket. */
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for (bp = global_symbol_hash_table[hashval]; bp; bp = bp->link)
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if (! strcmp (key, bp->name))
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return bp;
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/* Nothing was found; create a new symbol table entry. */
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bp = (ldsym_type *) ldmalloc (sizeof (ldsym_type));
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bp->srefs_chain = (asymbol **)NULL;
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bp->sdefs_chain = (asymbol **)NULL;
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bp->scoms_chain = (asymbol **)NULL;
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bp->name = buystring(key);
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/* Add the entry to the bucket. */
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bp->link = global_symbol_hash_table[hashval];
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global_symbol_hash_table[hashval] = bp;
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/* Keep the chronological list up to date too */
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*symbol_tail_ptr = bp;
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symbol_tail_ptr = &bp->next;
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bp->next = 0;
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global_symbol_count++;
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return bp;
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}
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/* Like `ldsym_get' but return 0 if the symbol is not already known. */
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ldsym_type *
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DEFUN(ldsym_get_soft,(key),
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CONST char *key)
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{
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register int hashval;
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register ldsym_type *bp;
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/* Determine which bucket. */
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hashval = hash_string (key) % TABSIZE;
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/* Search the bucket. */
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for (bp = global_symbol_hash_table[hashval]; bp; bp = bp->link)
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if (! strcmp (key, bp->name))
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return bp;
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return 0;
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}
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static void
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list_file_locals (entry)
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lang_input_statement_type *entry;
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{
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asymbol **q;
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fprintf (stderr, "\nLocal symbols of ");
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info("%I", entry);
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fprintf (stderr, ":\n\n");
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if (entry->asymbols) {
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for (q = entry->asymbols; *q; q++)
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{
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asymbol *p = *q;
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/* If this is a definition,
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update it if necessary by this file's start address. */
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if (p->flags & BSF_LOCAL)
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info(" %V %s\n",p->value, p->name);
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}
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}
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}
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static void
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print_file_stuff(f)
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lang_input_statement_type *f;
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{
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fprintf (stderr, " %s", f->filename);
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fprintf (stderr, " ");
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if (f->just_syms_flag)
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{
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fprintf (stderr, " symbols only\n");
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}
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else
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{
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asection *s;
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if (option_longmap) {
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for (s = f->the_bfd->sections;
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s != (asection *)NULL;
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s = s->next) {
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fprintf (stderr, "%08lx %08x 2**%2ud %s\n",
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s->output_offset,
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(unsigned)s->size, s->alignment_power, s->name);
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}
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}
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else {
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for (s = f->the_bfd->sections;
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s != (asection *)NULL;
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s = s->next) {
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fprintf (stderr, "%s %lx(%x) ",
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s->name,
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s->output_offset,
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(unsigned) s->size);
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}
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fprintf (stderr, "hex \n");
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}
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}
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}
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void
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ldsym_print_symbol_table ()
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{
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fprintf (stderr, "\nFiles:\n\n");
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lang_for_each_file(print_file_stuff);
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fprintf (stderr, "\nGlobal symbols:\n\n");
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{
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register ldsym_type *sp;
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for (sp = symbol_head; sp; sp = sp->next)
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{
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if (sp->sdefs_chain)
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{
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asymbol *defsym = *(sp->sdefs_chain);
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asection *defsec = bfd_get_section(defsym);
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fprintf(stderr,"%08lx ",defsym->value);
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if (defsec)
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{
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fprintf(stderr,"%08lx ",defsym->value+defsec->vma);
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fprintf(stderr,
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"%7s",
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bfd_section_name(output_bfd,
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defsec));
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}
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else
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{
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fprintf(stderr," .......");
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}
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}
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else {
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fprintf(stderr,"undefined");
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}
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if (sp->scoms_chain) {
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fprintf(stderr, " common size %5lu %s",
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(*(sp->scoms_chain))->value, sp->name);
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}
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if (sp->sdefs_chain) {
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fprintf(stderr, " symbol def %08lx %s",
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(*(sp->sdefs_chain))->value,
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sp->name);
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}
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else {
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fprintf(stderr, " undefined %s",
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sp->name);
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}
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fprintf(stderr, "\n");
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}
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}
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lang_for_each_file(list_file_locals);
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}
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extern lang_output_section_statement_type *create_object_symbols;
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extern char lprefix;
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static asymbol **
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write_file_locals(output_buffer)
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asymbol **output_buffer;
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{
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LANG_FOR_EACH_INPUT_STATEMENT(entry)
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{
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/* Run trough the symbols and work out what to do with them */
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unsigned int i;
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/* Add one for the filename symbol if needed */
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if (create_object_symbols
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!= (lang_output_section_statement_type *)NULL) {
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asection *s;
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for (s = entry->the_bfd->sections;
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s != (asection *)NULL;
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s = s->next) {
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if (s->output_section == create_object_symbols->bfd_section) {
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/* Add symbol to this section */
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asymbol * newsym =
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(asymbol *)bfd_make_empty_symbol(entry->the_bfd);
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newsym->name = entry->local_sym_name;
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/* The symbol belongs to the output file's text section */
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/* The value is the start of this section in the output file*/
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newsym->value = 0;
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newsym->flags = BSF_LOCAL;
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newsym->section = s;
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*output_buffer++ = newsym;
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break;
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}
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}
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}
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for (i = 0; i < entry->symbol_count; i++)
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{
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asymbol *p = entry->asymbols[i];
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if (flag_is_global(p->flags) || flag_is_absolute(p->flags))
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{
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/* We are only interested in outputting
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globals at this stage in special circumstances */
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if (p->the_bfd == entry->the_bfd
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&& flag_is_not_at_end(p->flags)) {
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/* And this is one of them */
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*(output_buffer++) = p;
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p->flags |= BSF_KEEP;
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}
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}
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else {
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if (flag_is_ordinary_local(p->flags))
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{
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if (discard_locals == DISCARD_ALL)
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{ }
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else if (discard_locals == DISCARD_L &&
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(p->name[0] == lprefix))
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{ }
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else if (p->flags == BSF_WARNING)
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{ }
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else
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{ *output_buffer++ = p; }
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}
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else if (flag_is_debugger(p->flags))
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{
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/* Only keep the debugger symbols if no stripping required */
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if (strip_symbols == STRIP_NONE) {
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*output_buffer++ = p;
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}
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}
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else if (flag_is_undefined(p->flags))
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{ /* This must be global */
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}
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else if (flag_is_common(p->flags)) {
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/* And so must this */
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}
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else if (p->flags & BSF_CTOR) {
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/* Throw it away */
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}
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else
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{
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FAIL();
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}
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}
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}
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}
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return output_buffer;
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}
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static asymbol **
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write_file_globals(symbol_table)
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asymbol **symbol_table;
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{
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FOR_EACH_LDSYM(sp)
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{
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if (sp->sdefs_chain != (asymbol **)NULL) {
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asymbol *bufp = (*(sp->sdefs_chain));
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if ((bufp->flags & BSF_KEEP) ==0) {
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ASSERT(bufp != (asymbol *)NULL);
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bufp->name = sp->name;
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if (sp->scoms_chain != (asymbol **)NULL)
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{
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/*
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defined as common but not allocated, this happens
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only with -r and not -d, write out a common
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definition
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*/
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bufp = *(sp->scoms_chain);
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}
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*symbol_table++ = bufp;
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}
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}
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else if (sp->scoms_chain != (asymbol **)NULL) {
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/* This symbol is a common - just output */
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asymbol *bufp = (*(sp->scoms_chain));
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*symbol_table++ = bufp;
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}
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else if (sp->srefs_chain != (asymbol **)NULL) {
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/* This symbol is undefined but has a reference */
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asymbol *bufp = (*(sp->srefs_chain));
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*symbol_table++ = bufp;
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}
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else {
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/*
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This symbol has neither defs nor refs, it must have come
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from the command line, since noone has used it it has no
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data attatched, so we'll ignore it
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*/
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}
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}
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return symbol_table;
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}
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void
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ldsym_write()
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{
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if (strip_symbols != STRIP_ALL) {
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/* We know the maximum size of the symbol table -
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it's the size of all the global symbols ever seen +
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the size of all the symbols from all the files +
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the number of files (for the per file symbols)
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+1 (for the null at the end)
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*/
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extern unsigned int total_files_seen;
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extern unsigned int total_symbols_seen;
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asymbol ** symbol_table = (asymbol **)
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ldmalloc ((size_t)(global_symbol_count +
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total_files_seen +
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total_symbols_seen + 1) * sizeof (asymbol *));
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asymbol ** tablep = write_file_locals(symbol_table);
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tablep = write_file_globals(tablep);
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*tablep = (asymbol *)NULL;
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bfd_set_symtab(output_bfd, symbol_table, (unsigned)( tablep - symbol_table));
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}
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}
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/*
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return true if the supplied symbol name is not in the
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linker symbol table
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*/
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boolean
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DEFUN(ldsym_undefined,(sym),
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CONST char *sym)
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{
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ldsym_type *from_table = ldsym_get_soft(sym);
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if (from_table != (ldsym_type *)NULL) {
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if (from_table->sdefs_chain != (asymbol **)NULL) return false;
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}
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return true;
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}
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