125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
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/* ldindr.c
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Handle indirect symbols.
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Copyright (C) 1991 Free Software Foundation, Inc.
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Written by Steve Chamberlain steve@cygnus.com
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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 2, 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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/*
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An indirect symbol is where a global symbol in one file say's that
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all refs like it should be turned into refs of the symbol pointed
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at by the value of the indirect symbol.
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BFD supplies symbols to be indirected with the BFD_INDIRECT bit
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set. Whenever the linker gets one of these, it calls add_indirect
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with the symbol. We look up the symbol which this one dereferneces,
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and stop if they are the same. If they are not the same, copy all
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the information from the current to the dereffed symbol. Set the
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indirect bit in the flag. From now on the ldsym_get stuff will
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perform the indirection for us, at no charge.
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*/
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#include "bfd.h"
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#include "sysdep.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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static asymbol **
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move_it (a_list, b_list)
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asymbol **a_list;
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asymbol **b_list;
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{
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asymbol **head = a_list;
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asymbol **cursor = head;
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if (a_list == 0) return b_list;
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if (b_list == 0) return a_list;
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while (1) {
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asymbol *ptr = cursor[0];
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asymbol **next = (asymbol **)(ptr->udata);
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if (next == 0) {
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ptr->udata = (PTR) b_list;
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return head;
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}
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cursor = next;
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}
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}
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#if 0
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void
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copy_over (ldsym, bfdsym)
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ldsym_type *ldsym;
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asymbol **bfdsym;
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{
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while (list && *list)
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{
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refize(enter_global_ref(list, name));
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list = (asymbol **)((*list)->udata);
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}
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}
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#endif
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/* This call allows us to change the symbol table so that all future
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refs to the symbol are patched to know the alias - but we still
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have to fix all the old ones */
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void
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add_indirect (ptr)
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asymbol **ptr;
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{
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asymbol **p;
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ldsym_type *lgs = ldsym_get((*ptr)->name);
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ldsym_type *new = ldsym_get(((asymbol *)((*ptr)->value))->name);
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/* If the mapping has already been done, stop now */
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if (lgs == new) return;
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lgs->flags |= SYM_INDIRECT;
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if (lgs->sdefs_chain && lgs->sdefs_chain[0])
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{
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einfo("indirect symbol already has definition %s", lgs->sdefs_chain[0]);
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}
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new->scoms_chain = move_it(new->scoms_chain, lgs->scoms_chain);
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lgs->scoms_chain = 0;
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new->srefs_chain = move_it(new->srefs_chain, lgs->srefs_chain);
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lgs->srefs_chain = 0;
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new->sdefs_chain = move_it(new->sdefs_chain, lgs->sdefs_chain);
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lgs->sdefs_chain = 0;
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/* If the result has any commons they should be turned into refs */
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if (new->sdefs_chain && new->scoms_chain)
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{
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refize(new, new->scoms_chain);
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}
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lgs->sdefs_chain = (asymbol **)new;
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lgs->srefs_chain = ptr;
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}
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