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https://sourceware.org/git/binutils-gdb.git
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76971f0da2
Per.
793 lines
18 KiB
C
793 lines
18 KiB
C
/* This module handles expression trees.
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Copyright (C) 1991 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 "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 "ldsym.h"
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#include "ldlang.h"
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extern char *output_filename;
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extern unsigned int undefined_global_sym_count;
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extern unsigned int defined_global_sym_count;
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extern bfd *output_bfd;
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extern bfd_size_type largest_section;
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extern lang_statement_list_type file_chain;
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extern args_type command_line;
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extern ld_config_type config;
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extern lang_input_statement_type *script_file;
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extern unsigned int defined_global_sym_count;
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extern lang_output_section_statement_type *abs_output_section;
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extern bfd_vma print_dot;
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static void
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DEFUN(exp_print_token,( code),
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token_code_type code)
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{
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static struct {
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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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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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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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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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DEFUN(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
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DEFUN(etree_value_type 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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DEFUN(check, (os, name, op),
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lang_output_section_statement_type *os AND
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CONST char *name AND
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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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DEFUN(exp_intop,(value),
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bfd_vma value)
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{
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etree_type *new = (etree_type *)ldmalloc((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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static
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DEFUN(etree_value_type new_rel,(value, section),
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bfd_vma value AND
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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
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DEFUN(etree_value_type
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new_rel_from_section, (value, section),
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bfd_vma value AND
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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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DEFUN(fold_binary,(tree, current_section, allocation_done, dot, dotp),
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etree_type *tree AND
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lang_output_section_statement_type *current_section AND
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lang_phase_type allocation_done AND
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bfd_vma dot AND
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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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DEFUN_VOID(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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etree_value_type
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DEFUN(fold_name, (tree, current_section, allocation_done, dot),
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etree_type *tree AND
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lang_output_section_statement_type *current_section AND
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lang_phase_type allocation_done AND
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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_sizeof_headers(output_bfd,
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config.relocateable_output));
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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 DEFINED:
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result.value =
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ldsym_get_soft(tree->name.name) != (ldsym_type *)NULL;
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result.section = 0;
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result.valid = true;
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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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if (allocation_done != lang_first_phase_enum) {
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result = new_rel_from_section(dot, current_section);
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}
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else {
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result = invalid();
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}
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}
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else {
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if (allocation_done == lang_final_phase_enum) {
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ldsym_type *sy = ldsym_get_soft(tree->name.name);
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if (sy) {
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asymbol **sdefp = sy->sdefs_chain;
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if (sdefp) {
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asymbol *sdef = *sdefp;
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#if 0
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if (sdef->section == (asection *)NULL) {
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/* This is an absolute symbol */
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result = new_abs(sdef->value);
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}
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else
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#endif
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{
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lang_output_section_statement_type *os =
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lang_output_section_statement_lookup(
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sdef->section->output_section->name);
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/* If the symbol is from a file which we are not
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relocating (-R) then return an absolute for its
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value */
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if (sdef->the_bfd->usrdata &&
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((lang_input_statement_type*)(sdef->the_bfd->usrdata))->just_syms_flag == true)
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{
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result = new_abs(sdef->value +sdef->section->vma);
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}
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else {
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result = new_rel(sdef->value + sdef->section->output_offset, os);
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}
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}
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}
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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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}
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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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DEFUN(exp_fold_tree,(tree, current_section, allocation_done,
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dot, dotp),
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etree_type *tree AND
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lang_output_section_statement_type *current_section AND
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lang_phase_type allocation_done AND
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bfd_vma dot AND
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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_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(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 '~':
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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(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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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 (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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unsigned long 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");
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}
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else {
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*dotp = nextdot;
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}
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}
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}
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}
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}
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else {
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ldsym_type *sy = ldsym_get(tree->assign.dst);
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/* If this symbol has just been created then we'll place it into
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* a section of our choice
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*/
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result = exp_fold_tree(tree->assign.src,
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current_section, allocation_done,
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dot, dotp);
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if (result.valid)
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{
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asymbol *def;
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asymbol **def_ptr ;
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/* Add this definition to script file */
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if (sy->sdefs_chain)
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{
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def_ptr = sy->sdefs_chain;
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def = *def_ptr;
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}
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else
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{
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def_ptr = (asymbol **)ldmalloc((bfd_size_type)(sizeof(asymbol **)));
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def = (asymbol *)bfd_make_empty_symbol(script_file->the_bfd);
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def->flags = 0;
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sy->sdefs_chain = def_ptr;
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*def_ptr = def;
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}
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def->value = result.value;
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def->section = result.section->bfd_section;
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def->flags = BSF_GLOBAL | BSF_EXPORT;
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def->udata = (PTR)NULL;
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def->name = sy->name;
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if (sy->sdefs_chain == 0) Q_enter_global_ref(def_ptr);
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}
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}
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break;
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case etree_name:
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result = fold_name(tree, current_section, allocation_done, dot);
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break;
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default:
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einfo("%F%S Need more of these %d",tree->type.node_class );
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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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DEFUN(exp_fold_tree_no_dot,(tree, current_section, allocation_done),
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etree_type *tree AND
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lang_output_section_statement_type *current_section AND
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lang_phase_type allocation_done)
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{
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return exp_fold_tree(tree, current_section, allocation_done, (bfd_vma)
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0, (bfd_vma *)NULL);
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}
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etree_type *
|
|
DEFUN(exp_binop,(code, lhs, rhs),
|
|
int code AND
|
|
etree_type *lhs AND
|
|
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 *)ldmalloc((bfd_size_type)(sizeof(new->binary)));
|
|
memcpy((char *)new, (char *)&value, sizeof(new->binary));
|
|
return new;
|
|
}
|
|
|
|
etree_type *
|
|
DEFUN(exp_trinop,(code, cond, lhs, rhs),
|
|
int code AND
|
|
etree_type *cond AND
|
|
etree_type *lhs AND
|
|
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 *)ldmalloc((bfd_size_type)(sizeof(new->trinary)));
|
|
memcpy((char *)new,(char *) &value, sizeof(new->trinary));
|
|
return new;
|
|
}
|
|
|
|
|
|
etree_type *
|
|
DEFUN(exp_unop,(code, child),
|
|
int code AND
|
|
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,(lang_output_section_statement_type *)NULL,
|
|
lang_first_phase_enum);
|
|
if (r.valid) {
|
|
return exp_intop(r.value);
|
|
}
|
|
new = (etree_type *)ldmalloc((bfd_size_type)(sizeof(new->unary)));
|
|
memcpy((char *)new, (char *)&value, sizeof(new->unary));
|
|
return new;
|
|
}
|
|
|
|
|
|
etree_type *
|
|
DEFUN(exp_nameop,(code, name),
|
|
int code AND
|
|
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 *)ldmalloc((bfd_size_type)(sizeof(new->name)));
|
|
memcpy((char *)new, (char *)&value, sizeof(new->name));
|
|
return new;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
etree_type *
|
|
DEFUN(exp_assop,(code, dst, src),
|
|
int code AND
|
|
CONST char *dst AND
|
|
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*)ldmalloc((bfd_size_type)(sizeof(new->assign)));
|
|
memcpy((char *)new, (char *)&value, sizeof(new->assign));
|
|
return new;
|
|
}
|
|
|
|
void
|
|
DEFUN(exp_print_tree,(tree),
|
|
etree_type *tree)
|
|
{
|
|
switch (tree->type.node_class) {
|
|
case etree_value:
|
|
print_address(tree->value.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_binary:
|
|
exp_print_tree(tree->binary.lhs);
|
|
exp_print_token(tree->type.node_code);
|
|
exp_print_tree(tree->binary.rhs);
|
|
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);
|
|
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);
|
|
fprintf(config.map_file,"(%s)", tree->name.name);
|
|
}
|
|
break;
|
|
default:
|
|
FAIL();
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
bfd_vma
|
|
DEFUN(exp_get_vma,(tree, def, name, allocation_done),
|
|
etree_type *tree AND
|
|
bfd_vma def AND
|
|
char *name AND
|
|
lang_phase_type allocation_done)
|
|
{
|
|
etree_value_type r;
|
|
|
|
if (tree != (etree_type *)NULL) {
|
|
r = exp_fold_tree_no_dot(tree,
|
|
(lang_output_section_statement_type *)NULL,
|
|
allocation_done);
|
|
if (r.valid == false && name) {
|
|
einfo("%F%S Nonconstant expression for %s\n",name);
|
|
}
|
|
return r.value;
|
|
}
|
|
else {
|
|
return def;
|
|
}
|
|
}
|
|
|
|
int
|
|
DEFUN(exp_get_value_int,(tree,def,name, allocation_done),
|
|
etree_type *tree AND
|
|
int def AND
|
|
char *name AND
|
|
lang_phase_type allocation_done)
|
|
{
|
|
return (int)exp_get_vma(tree,(bfd_vma)def,name, allocation_done);
|
|
}
|
|
|