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31ddb15694
Add a new script operator, PROVIDE, to define a symbol only if it is needed. * ldgram.y (PROVIDE): New token. (assignment): Accept PROVIDE. * ldlex.l (PROVIDE): New token. * ldexp.h (node_type): Add etree_provide to node_class enum. (exp_provide): Declare. * ldexp.c (exp_fold_tree): Handle etree_provide. (exp_provide): New function. (exp_print_tree): Handle etree_provide. * ld.texinfo: Document PROVIDE.
855 lines
20 KiB
C
855 lines
20 KiB
C
/* This module handles expression trees.
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Copyright (C) 1991, 1993 Free Software Foundation, Inc.
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Written by Steve Chamberlain of Cygnus Support (sac@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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This module is in charge of working out the contents of expressions.
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It has to keep track of the relative/absness of a symbol etc. This is
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done by keeping all values in a struct (an etree_value_type) which
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contains a value, a section to which it is relative and a valid bit.
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*/
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#include "bfd.h"
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#include "sysdep.h"
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#include "bfdlink.h"
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#include "ld.h"
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#include "ldmain.h"
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#include "ldmisc.h"
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#include "ldexp.h"
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#include "ldgram.h"
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#include "ldlang.h"
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static void exp_print_token PARAMS ((token_code_type code));
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static void make_abs PARAMS ((etree_value_type *ptr));
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static etree_value_type new_abs PARAMS ((bfd_vma value));
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static void check PARAMS ((lang_output_section_statement_type *os,
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const char *name, const char *op));
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static etree_value_type new_rel
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PARAMS ((bfd_vma value, lang_output_section_statement_type *section));
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static etree_value_type new_rel_from_section
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PARAMS ((bfd_vma value, lang_output_section_statement_type *section));
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static etree_value_type fold_binary
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PARAMS ((etree_type *tree,
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lang_output_section_statement_type *current_section,
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lang_phase_type allocation_done,
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bfd_vma dot, bfd_vma *dotp));
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static etree_value_type fold_name
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PARAMS ((etree_type *tree,
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lang_output_section_statement_type *current_section,
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lang_phase_type allocation_done,
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bfd_vma dot));
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static etree_value_type exp_fold_tree_no_dot
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PARAMS ((etree_type *tree,
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lang_output_section_statement_type *current_section,
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lang_phase_type allocation_done));
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static void
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exp_print_token (code)
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token_code_type code;
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{
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static CONST struct
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{
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token_code_type code;
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char *name;
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} table[] =
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{
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{ INT, "int" },
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{ REL, "relocateable" },
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{ NAME,"NAME" },
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{ PLUSEQ,"+=" },
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{ MINUSEQ,"-=" },
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{ MULTEQ,"*=" },
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{ DIVEQ,"/=" },
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{ LSHIFTEQ,"<<=" },
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{ RSHIFTEQ,">>=" },
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{ ANDEQ,"&=" },
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{ OREQ,"|=" },
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{ OROR,"||" },
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{ ANDAND,"&&" },
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{ EQ,"==" },
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{ NE,"!=" },
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{ LE,"<=" },
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{ GE,">=" },
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{ LSHIFT,"<<" },
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{ RSHIFT,">>=" },
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{ ALIGN_K,"ALIGN" },
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{ BLOCK,"BLOCK" },
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{ SECTIONS,"SECTIONS" },
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{ SIZEOF_HEADERS,"SIZEOF_HEADERS" },
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{ NEXT,"NEXT" },
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{ SIZEOF,"SIZEOF" },
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{ ADDR,"ADDR" },
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{ MEMORY,"MEMORY" },
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{ DEFINED,"DEFINED" },
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{ TARGET_K,"TARGET" },
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{ SEARCH_DIR,"SEARCH_DIR" },
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{ MAP,"MAP" },
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{ QUAD,"QUAD" },
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{ LONG,"LONG" },
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{ SHORT,"SHORT" },
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{ BYTE,"BYTE" },
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{ ENTRY,"ENTRY" },
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{ 0,(char *)NULL }
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};
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unsigned int idx;
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for (idx = 0; table[idx].name != (char*)NULL; idx++) {
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if (table[idx].code == code) {
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fprintf(config.map_file, "%s", table[idx].name);
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return;
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}
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}
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/* Not in table, just print it alone */
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fprintf(config.map_file, "%c",code);
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}
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static void
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make_abs (ptr)
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etree_value_type *ptr;
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{
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asection *s = ptr->section->bfd_section;
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ptr->value += s->vma;
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ptr->section = abs_output_section;
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}
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static etree_value_type
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new_abs (value)
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bfd_vma value;
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{
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etree_value_type new;
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new.valid = true;
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new.section = abs_output_section;
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new.value = value;
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return new;
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}
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static void
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check (os, name, op)
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lang_output_section_statement_type *os;
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CONST char *name;
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CONST char *op;
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{
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if (os == (lang_output_section_statement_type *)NULL) {
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einfo("%F%P: %s uses undefined section %s\n", op, name);
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}
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if (os->processed == false) {
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einfo("%F%P: %s forward reference of section %s\n",op, name);
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}
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}
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etree_type *
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exp_intop (value)
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bfd_vma value;
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{
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etree_type *new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->value)));
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new->type.node_code = INT;
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new->value.value = value;
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new->type.node_class = etree_value;
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return new;
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}
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/* Build an expression representing an unnamed relocateable value. */
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etree_type *
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exp_relop (section, value)
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asection *section;
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bfd_vma value;
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{
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etree_type *new = (etree_type *) stat_alloc (sizeof (new->rel));
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new->type.node_code = REL;
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new->type.node_class = etree_rel;
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new->rel.section = section;
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new->rel.value = value;
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return new;
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}
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static etree_value_type
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new_rel (value, section)
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bfd_vma value;
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lang_output_section_statement_type *section;
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{
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etree_value_type new;
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new.valid = true;
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new.value = value;
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new.section = section;
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return new;
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}
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static etree_value_type
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new_rel_from_section (value, section)
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bfd_vma value;
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lang_output_section_statement_type *section;
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{
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etree_value_type new;
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new.valid = true;
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new.value = value;
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new.section = section;
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new.value -= section->bfd_section->vma;
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return new;
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}
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static etree_value_type
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fold_binary (tree, current_section, allocation_done, dot, dotp)
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etree_type *tree;
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lang_output_section_statement_type *current_section;
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lang_phase_type allocation_done;
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bfd_vma dot;
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bfd_vma *dotp;
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{
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etree_value_type result;
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result = exp_fold_tree(tree->binary.lhs, current_section,
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allocation_done, dot, dotp);
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if (result.valid) {
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etree_value_type other;
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other = exp_fold_tree(tree->binary.rhs,
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current_section,
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allocation_done, dot,dotp) ;
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if (other.valid) {
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/* If values are from different sections, or this is an */
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/* absolute expression, make both source args absolute */
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if (result.section != other.section ||
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current_section == abs_output_section)
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{
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make_abs(&result);
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make_abs(&other);
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}
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switch (tree->type.node_code)
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{
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case '%':
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/* Mod, both absolule*/
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if (other.value == 0) {
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einfo("%F%S %% by zero\n");
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}
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result.value = (int)result.value % (int)other.value;
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break;
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case '/':
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if (other.value == 0) {
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einfo("%F%S / by zero\n");
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}
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result.value = (int)result.value / (int) other.value;
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break;
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#define BOP(x,y) case x : result.value = result.value y other.value;break;
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BOP('+',+);
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BOP('*',*);
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BOP('-',-);
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BOP(LSHIFT,<<);
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BOP(RSHIFT,>>);
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BOP(EQ,==);
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BOP(NE,!=);
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BOP('<',<);
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BOP('>',>);
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BOP(LE,<=);
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BOP(GE,>=);
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BOP('&',&);
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BOP('^',^);
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BOP('|',|);
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BOP(ANDAND,&&);
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BOP(OROR,||);
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default:
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FAIL();
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}
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}
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else {
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result.valid = false;
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}
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}
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return result;
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}
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etree_value_type
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invalid ()
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{
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etree_value_type new;
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new.valid = false;
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return new;
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}
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static etree_value_type
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fold_name (tree, current_section, allocation_done, dot)
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etree_type *tree;
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lang_output_section_statement_type *current_section;
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lang_phase_type allocation_done;
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bfd_vma dot;
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{
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etree_value_type result;
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switch (tree->type.node_code)
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{
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case SIZEOF_HEADERS:
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if (allocation_done != lang_first_phase_enum)
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{
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result = new_abs ((bfd_vma)
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bfd_sizeof_headers (output_bfd,
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link_info.relocateable));
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}
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else
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{
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result.valid = false;
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}
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break;
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case DEFINED:
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{
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struct bfd_link_hash_entry *h;
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h = bfd_link_hash_lookup (link_info.hash, tree->name.name,
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false, false, true);
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result.value = (h != (struct bfd_link_hash_entry *) NULL
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&& (h->type == bfd_link_hash_defined
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|| h->type == bfd_link_hash_common));
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result.section = 0;
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result.valid = true;
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}
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break;
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case NAME:
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result.valid = false;
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if (tree->name.name[0] == '.' && tree->name.name[1] == 0)
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{
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if (allocation_done != lang_first_phase_enum)
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result = new_rel_from_section(dot, current_section);
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else
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result = invalid();
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}
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else if (allocation_done == lang_final_phase_enum)
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{
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struct bfd_link_hash_entry *h;
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h = bfd_link_hash_lookup (link_info.hash, tree->name.name,
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false, false, true);
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if (h != (struct bfd_link_hash_entry *) NULL
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&& h->type == bfd_link_hash_defined)
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{
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lang_output_section_statement_type *os;
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os = (lang_output_section_statement_lookup
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(h->u.def.section->output_section->name));
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/* FIXME: Is this correct if this section is being
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linked with -R? */
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result = new_rel ((h->u.def.value
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+ h->u.def.section->output_offset),
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os);
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}
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if (result.valid == false)
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einfo("%F%S: undefined symbol `%s' referenced in expression\n",
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tree->name.name);
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}
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break;
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case ADDR:
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if (allocation_done != lang_first_phase_enum) {
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lang_output_section_statement_type *os =
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lang_output_section_find(tree->name.name);
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check(os,tree->name.name,"ADDR");
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result = new_rel((bfd_vma)0, os);
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}
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else {
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result = invalid();
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}
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break;
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case SIZEOF:
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if(allocation_done != lang_first_phase_enum) {
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lang_output_section_statement_type *os =
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lang_output_section_find(tree->name.name);
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check(os,tree->name.name,"SIZEOF");
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result = new_abs((bfd_vma)(os->bfd_section->_raw_size));
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}
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else {
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result = invalid();
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}
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break;
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default:
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FAIL();
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break;
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}
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return result;
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}
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etree_value_type
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exp_fold_tree (tree, current_section, allocation_done, dot, dotp)
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etree_type *tree;
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lang_output_section_statement_type *current_section;
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lang_phase_type allocation_done;
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bfd_vma dot;
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bfd_vma *dotp;
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{
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etree_value_type result;
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if (tree == (etree_type *)NULL) {
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result.valid = false;
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}
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else {
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switch (tree->type.node_class)
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{
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case etree_value:
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result = new_rel(tree->value.value, current_section);
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break;
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case etree_rel:
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if (allocation_done != lang_final_phase_enum)
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result.valid = false;
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else
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result = new_rel ((tree->rel.value
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+ tree->rel.section->output_section->vma
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+ tree->rel.section->output_offset),
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current_section);
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break;
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case etree_unary:
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result = exp_fold_tree(tree->unary.child,
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current_section,
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allocation_done, dot, dotp);
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if (result.valid == true)
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{
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switch(tree->type.node_code)
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{
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case ALIGN_K:
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if (allocation_done != lang_first_phase_enum) {
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result = new_rel_from_section(ALIGN_N(dot,
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result.value) ,
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current_section);
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}
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else {
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result.valid = false;
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}
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break;
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case ABSOLUTE:
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if (allocation_done != lang_first_phase_enum)
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{
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if (current_section
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== (lang_output_section_statement_type*)NULL)
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{
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/* Outside a section, so it's all ok */
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}
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else {
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/* Inside a section, subtract the base of the section,
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so when it's added again (in an assignment), everything comes out fine
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*/
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result.section = abs_output_section;
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result.value -= current_section->bfd_section->vma;
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result.valid = true;
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}
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}
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else
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{
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result.valid = false;
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}
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break;
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case '~':
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make_abs(&result);
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result.value = ~result.value;
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break;
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case '!':
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make_abs(&result);
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result.value = !result.value;
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break;
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case '-':
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make_abs(&result);
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result.value = -result.value;
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break;
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case NEXT:
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if (allocation_done ==lang_allocating_phase_enum) {
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make_abs(&result);
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result.value = ALIGN_N(dot, result.value);
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}
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else {
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/* Return next place aligned to value */
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result.valid = false;
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}
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break;
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default:
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FAIL();
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}
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}
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break;
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case etree_trinary:
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result = exp_fold_tree(tree->trinary.cond,
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current_section,
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allocation_done, dot, dotp);
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if (result.valid) {
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result = exp_fold_tree(result.value ?
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tree->trinary.lhs:tree->trinary.rhs,
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current_section,
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allocation_done, dot, dotp);
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}
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break;
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case etree_binary:
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result = fold_binary(tree, current_section, allocation_done,
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dot, dotp);
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break;
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case etree_assign:
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case etree_provide:
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if (tree->assign.dst[0] == '.' && tree->assign.dst[1] == 0) {
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/* Assignment to dot can only be done during allocation */
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if (tree->type.node_class == etree_provide)
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einfo ("%F%S can not PROVIDE assignment to location counter\n");
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if (allocation_done == lang_allocating_phase_enum) {
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result = exp_fold_tree(tree->assign.src,
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current_section,
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lang_allocating_phase_enum, dot, dotp);
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if (result.valid == false) {
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einfo("%F%S invalid assignment to location counter\n");
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}
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else {
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if (current_section ==
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(lang_output_section_statement_type *)NULL) {
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einfo("%F%S assignment to location counter invalid outside of SECTION\n");
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}
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else {
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bfd_vma nextdot =result.value +
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current_section->bfd_section->vma;
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if (nextdot < dot) {
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einfo("%F%S cannot move location counter backwards (from %V to %V)\n", dot, nextdot);
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}
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else {
|
|
*dotp = nextdot;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
result = exp_fold_tree (tree->assign.src,
|
|
current_section, allocation_done,
|
|
dot, dotp);
|
|
if (result.valid)
|
|
{
|
|
struct bfd_link_hash_entry *h;
|
|
|
|
h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
|
|
(tree->type.node_class == etree_assign
|
|
? true : false),
|
|
false, false);
|
|
if (h == (struct bfd_link_hash_entry *) NULL)
|
|
{
|
|
if (tree->type.node_class == etree_assign)
|
|
einfo ("%P%F:%s: hash creation failed\n",
|
|
tree->assign.dst);
|
|
}
|
|
else if (tree->type.node_class == etree_provide
|
|
&& h->type != bfd_link_hash_undefined
|
|
&& h->type != bfd_link_hash_common)
|
|
{
|
|
/* Do nothing. The symbol was defined by some
|
|
object. */
|
|
}
|
|
else
|
|
{
|
|
/* FIXME: Should we worry if the symbol is already
|
|
defined? */
|
|
h->type = bfd_link_hash_defined;
|
|
h->u.def.value = result.value;
|
|
h->u.def.section = result.section->bfd_section;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case etree_name:
|
|
result = fold_name(tree, current_section, allocation_done, dot);
|
|
break;
|
|
default:
|
|
einfo("%F%S need more of these %d\n",tree->type.node_class );
|
|
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static etree_value_type
|
|
exp_fold_tree_no_dot (tree, current_section, allocation_done)
|
|
etree_type *tree;
|
|
lang_output_section_statement_type *current_section;
|
|
lang_phase_type allocation_done;
|
|
{
|
|
return exp_fold_tree(tree, current_section, allocation_done, (bfd_vma)
|
|
0, (bfd_vma *)NULL);
|
|
}
|
|
|
|
etree_type *
|
|
exp_binop (code, lhs, rhs)
|
|
int code;
|
|
etree_type *lhs;
|
|
etree_type *rhs;
|
|
{
|
|
etree_type value, *new;
|
|
etree_value_type r;
|
|
|
|
value.type.node_code = code;
|
|
value.binary.lhs = lhs;
|
|
value.binary.rhs = rhs;
|
|
value.type.node_class = etree_binary;
|
|
r = exp_fold_tree_no_dot(&value,
|
|
abs_output_section,
|
|
lang_first_phase_enum );
|
|
if (r.valid)
|
|
{
|
|
return exp_intop(r.value);
|
|
}
|
|
new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->binary)));
|
|
memcpy((char *)new, (char *)&value, sizeof(new->binary));
|
|
return new;
|
|
}
|
|
|
|
etree_type *
|
|
exp_trinop (code, cond, lhs, rhs)
|
|
int code;
|
|
etree_type *cond;
|
|
etree_type *lhs;
|
|
etree_type *rhs;
|
|
{
|
|
etree_type value, *new;
|
|
etree_value_type r;
|
|
value.type.node_code = code;
|
|
value.trinary.lhs = lhs;
|
|
value.trinary.cond = cond;
|
|
value.trinary.rhs = rhs;
|
|
value.type.node_class = etree_trinary;
|
|
r= exp_fold_tree_no_dot(&value, (lang_output_section_statement_type
|
|
*)NULL,lang_first_phase_enum);
|
|
if (r.valid) {
|
|
return exp_intop(r.value);
|
|
}
|
|
new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->trinary)));
|
|
memcpy((char *)new,(char *) &value, sizeof(new->trinary));
|
|
return new;
|
|
}
|
|
|
|
|
|
etree_type *
|
|
exp_unop (code, child)
|
|
int code;
|
|
etree_type *child;
|
|
{
|
|
etree_type value, *new;
|
|
|
|
etree_value_type r;
|
|
value.unary.type.node_code = code;
|
|
value.unary.child = child;
|
|
value.unary.type.node_class = etree_unary;
|
|
r = exp_fold_tree_no_dot(&value,abs_output_section,
|
|
lang_first_phase_enum);
|
|
if (r.valid) {
|
|
return exp_intop(r.value);
|
|
}
|
|
new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->unary)));
|
|
memcpy((char *)new, (char *)&value, sizeof(new->unary));
|
|
return new;
|
|
}
|
|
|
|
|
|
etree_type *
|
|
exp_nameop (code, name)
|
|
int code;
|
|
CONST char *name;
|
|
{
|
|
etree_type value, *new;
|
|
etree_value_type r;
|
|
value.name.type.node_code = code;
|
|
value.name.name = name;
|
|
value.name.type.node_class = etree_name;
|
|
|
|
|
|
r = exp_fold_tree_no_dot(&value,
|
|
(lang_output_section_statement_type *)NULL,
|
|
lang_first_phase_enum);
|
|
if (r.valid) {
|
|
return exp_intop(r.value);
|
|
}
|
|
new = (etree_type *)stat_alloc((bfd_size_type)(sizeof(new->name)));
|
|
memcpy((char *)new, (char *)&value, sizeof(new->name));
|
|
return new;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
etree_type *
|
|
exp_assop (code, dst, src)
|
|
int code;
|
|
CONST char *dst;
|
|
etree_type *src;
|
|
{
|
|
etree_type value, *new;
|
|
|
|
value.assign.type.node_code = code;
|
|
|
|
|
|
value.assign.src = src;
|
|
value.assign.dst = dst;
|
|
value.assign.type.node_class = etree_assign;
|
|
|
|
#if 0
|
|
if (exp_fold_tree_no_dot(&value, &result)) {
|
|
return exp_intop(result);
|
|
}
|
|
#endif
|
|
new = (etree_type*)stat_alloc((bfd_size_type)(sizeof(new->assign)));
|
|
memcpy((char *)new, (char *)&value, sizeof(new->assign));
|
|
return new;
|
|
}
|
|
|
|
/* Handle PROVIDE. */
|
|
|
|
etree_type *
|
|
exp_provide (dst, src)
|
|
const char *dst;
|
|
etree_type *src;
|
|
{
|
|
etree_type *n;
|
|
|
|
n = (etree_type *) stat_alloc (sizeof (n->assign));
|
|
n->assign.type.node_code = '=';
|
|
n->assign.type.node_class = etree_provide;
|
|
n->assign.src = src;
|
|
n->assign.dst = dst;
|
|
return n;
|
|
}
|
|
|
|
void
|
|
exp_print_tree (tree)
|
|
etree_type *tree;
|
|
{
|
|
switch (tree->type.node_class) {
|
|
case etree_value:
|
|
print_address(tree->value.value);
|
|
return;
|
|
case etree_rel:
|
|
if (tree->rel.section->owner != NULL)
|
|
fprintf (config.map_file, "%s:",
|
|
bfd_get_filename (tree->rel.section->owner));
|
|
fprintf (config.map_file, "%s+", tree->rel.section->name);
|
|
print_address (tree->rel.value);
|
|
return;
|
|
case etree_assign:
|
|
#if 0
|
|
if (tree->assign.dst->sdefs != (asymbol *)NULL){
|
|
fprintf(config.map_file,"%s (%x) ",tree->assign.dst->name,
|
|
tree->assign.dst->sdefs->value);
|
|
}
|
|
else {
|
|
fprintf(config.map_file,"%s (UNDEFINED)",tree->assign.dst->name);
|
|
}
|
|
#endif
|
|
fprintf(config.map_file,"%s ",tree->assign.dst);
|
|
exp_print_token(tree->type.node_code);
|
|
exp_print_tree(tree->assign.src);
|
|
break;
|
|
case etree_provide:
|
|
fprintf (config.map_file, "PROVIDE (%s, ", tree->assign.dst);
|
|
exp_print_tree (tree->assign.src);
|
|
fprintf (config.map_file, ")");
|
|
break;
|
|
case etree_binary:
|
|
fprintf(config.map_file,"(");
|
|
exp_print_tree(tree->binary.lhs);
|
|
exp_print_token(tree->type.node_code);
|
|
exp_print_tree(tree->binary.rhs);
|
|
fprintf(config.map_file,")");
|
|
break;
|
|
case etree_trinary:
|
|
exp_print_tree(tree->trinary.cond);
|
|
fprintf(config.map_file,"?");
|
|
exp_print_tree(tree->trinary.lhs);
|
|
fprintf(config.map_file,":");
|
|
exp_print_tree(tree->trinary.rhs);
|
|
break;
|
|
case etree_unary:
|
|
exp_print_token(tree->unary.type.node_code);
|
|
if (tree->unary.child)
|
|
{
|
|
|
|
fprintf(config.map_file,"(");
|
|
exp_print_tree(tree->unary.child);
|
|
fprintf(config.map_file,")");
|
|
}
|
|
|
|
break;
|
|
case etree_undef:
|
|
fprintf(config.map_file,"????????");
|
|
break;
|
|
case etree_name:
|
|
if (tree->type.node_code == NAME) {
|
|
fprintf(config.map_file,"%s", tree->name.name);
|
|
}
|
|
else {
|
|
exp_print_token(tree->type.node_code);
|
|
if (tree->name.name)
|
|
fprintf(config.map_file,"(%s)", tree->name.name);
|
|
}
|
|
break;
|
|
default:
|
|
FAIL();
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
bfd_vma
|
|
exp_get_vma (tree, def, name, allocation_done)
|
|
etree_type *tree;
|
|
bfd_vma def;
|
|
char *name;
|
|
lang_phase_type allocation_done;
|
|
{
|
|
etree_value_type r;
|
|
|
|
if (tree != (etree_type *)NULL) {
|
|
r = exp_fold_tree_no_dot(tree,
|
|
abs_output_section,
|
|
allocation_done);
|
|
if (r.valid == false && name) {
|
|
einfo("%F%S nonconstant expression for %s\n",name);
|
|
}
|
|
return r.value;
|
|
}
|
|
else {
|
|
return def;
|
|
}
|
|
}
|
|
|
|
int
|
|
exp_get_value_int (tree,def,name, allocation_done)
|
|
etree_type *tree;
|
|
int def;
|
|
char *name;
|
|
lang_phase_type allocation_done;
|
|
{
|
|
return (int)exp_get_vma(tree,(bfd_vma)def,name, allocation_done);
|
|
}
|
|
|