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.
526 lines
15 KiB
Text
526 lines
15 KiB
Text
%{
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/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
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This file is part of GLD, the Gnu Linker.
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GLD is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 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 was written by steve chamberlain
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sac@cygnus.com
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*/
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#include <ansidecl.h>
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#include <stdio.h>
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/* start-sanitize-mpw */
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#ifdef MPW
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/* Prevent enum redefinition problems. */
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#define TRUE_FALSE_ALREADY_DEFINED
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#endif /* MPW */
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/* end-sanitize-mpw */
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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 "ldgram.h"
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#include "ldmisc.h"
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#include "ldexp.h"
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#include "ldlang.h"
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#include "ldfile.h"
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#include "ldlex.h"
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#include "ldmain.h"
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/* The type of top-level parser input.
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yylex and yyparse (indirectly) both check this. */
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input_type parser_input;
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/* Radix to use for bfd_scan_vma -- 0 (default to base 10) or 16. */
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int hex_mode;
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/* Line number in the current input file.
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(FIXME Actually, it doesn't appear to get reset for each file?) */
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unsigned int lineno = 1;
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/* Support for flex reading from more than one input file (stream).
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`include_stack' is flex's input state for each open file;
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`file_name_stack' is the file names.
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If `include_stack_ptr' is 0, we haven't started reading anything yet.
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Otherwise, stack elements 0 through `include_stack_ptr - 1' are valid. */
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#undef YY_INPUT
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#define YY_INPUT(buf,result,max_size) yy_input(buf, &result, max_size)
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#define MAX_INCLUDE_DEPTH 10
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static YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
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static char *file_name_stack[MAX_INCLUDE_DEPTH];
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static unsigned int include_stack_ptr = 0;
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static YY_BUFFER_STATE yy_create_string_buffer PARAMS ((const char *string,
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size_t size));
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static void yy_input PARAMS ((char *, int *result, int max_size));
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static void comment PARAMS ((void));
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static void lex_warn_invalid PARAMS ((char *where, char *what));
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/* STATES
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EXPRESSION definitely in an expression
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SCRIPT definitely in a script
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BOTH either EXPRESSION or SCRIPT
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DEFSYMEXP in an argument to -defsym
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MRI in an MRI script
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*/
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#define RTOKEN(x) { yylval.token = x; return x; }
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/* Some versions of flex want this. */
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#ifndef yywrap
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int yywrap () { return 1; }
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#endif
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%}
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%a 4000
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%o 5000
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CMDFILENAMECHAR [_a-zA-Z0-9\/\.\\_\+\$\:\[\]\\\,\=\&\!\<\>\-\~]
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CMDFILENAMECHAR1 [_a-zA-Z0-9\/\.\\_\+\$\:\[\]\\\,\=\&\!\<\>\~]
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FILENAMECHAR1 [_a-zA-Z\/\.\\\$\_\~]
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SYMBOLCHARN [_a-zA-Z\/\.\\0-9]
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FILENAMECHAR [_a-zA-Z0-9\/\.\-\_\+\=\$\:\[\]\\\,\~]
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FILENAME {FILENAMECHAR}+
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WHITE [ \t\n\r]+
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NOCFILENAMECHAR [_a-zA-Z0-9\/\.\-\_\+\$\:\[\]\\\~]
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%s SCRIPT
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%s EXPRESSION
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%s BOTH
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%s DEFSYMEXP
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%s MRI
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%%
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if (parser_input != input_selected)
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{
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/* The first token of the input determines the initial parser state. */
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input_type t = parser_input;
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parser_input = input_selected;
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switch (t)
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{
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case input_script: return INPUT_SCRIPT; break;
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case input_mri_script: return INPUT_MRI_SCRIPT; break;
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case input_defsym: return INPUT_DEFSYM; break;
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default: abort ();
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}
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}
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<BOTH,SCRIPT,EXPRESSION>"/*" { comment(); }
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<DEFSYMEXP>"-" { RTOKEN('-');}
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<DEFSYMEXP>"+" { RTOKEN('+');}
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<DEFSYMEXP>{FILENAMECHAR1}{SYMBOLCHARN}* { yylval.name = buystring(yytext); return NAME; }
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<DEFSYMEXP>"=" { RTOKEN('='); }
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<MRI,EXPRESSION>"$"([0-9A-Fa-f])+ {
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yylval.integer = bfd_scan_vma (yytext+1, 0,16);
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return INT;
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}
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<MRI,EXPRESSION>([0-9A-Fa-f])+(H|X|B|O|D) {
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int ibase ;
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switch (yytext[yyleng-1]) {
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case 'X':
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case 'H':
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ibase = 16;
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break;
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case 'O':
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ibase = 8;
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break;
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case 'B':
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ibase = 2;
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break;
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default:
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ibase = 10;
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}
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yylval.integer = bfd_scan_vma (yytext+1, 0,
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ibase);
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return INT;
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}
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<SCRIPT,DEFSYMEXP,MRI,BOTH,EXPRESSION>"$"?"0x"?([0-9A-Fa-f])+(M|K|m|k)? {
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yylval.integer = bfd_scan_vma (yytext, 0,
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hex_mode);
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if (yytext[yyleng-1]=='M'
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|| yytext[yyleng-1] == 'm') {
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yylval.integer *= 1024*1024;
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}
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if (yytext[yyleng-1]=='K'
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|| yytext[yyleng-1]=='k') {
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yylval.integer *= 1024;
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}
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return INT;
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}
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<BOTH,SCRIPT,EXPRESSION>"]" { RTOKEN(']');}
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<BOTH,SCRIPT,EXPRESSION>"[" { RTOKEN('[');}
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<BOTH,SCRIPT,EXPRESSION>"<<=" { RTOKEN(LSHIFTEQ);}
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<BOTH,SCRIPT,EXPRESSION>">>=" { RTOKEN(RSHIFTEQ);}
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<BOTH,SCRIPT,EXPRESSION>"||" { RTOKEN(OROR);}
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<BOTH,SCRIPT,EXPRESSION>"==" { RTOKEN(EQ);}
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<BOTH,SCRIPT,EXPRESSION>"!=" { RTOKEN(NE);}
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<BOTH,SCRIPT,EXPRESSION>">=" { RTOKEN(GE);}
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<BOTH,SCRIPT,EXPRESSION>"<=" { RTOKEN(LE);}
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<BOTH,SCRIPT,EXPRESSION>"<<" { RTOKEN(LSHIFT);}
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<BOTH,SCRIPT,EXPRESSION>">>" { RTOKEN(RSHIFT);}
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<BOTH,SCRIPT,EXPRESSION>"+=" { RTOKEN(PLUSEQ);}
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<BOTH,SCRIPT,EXPRESSION>"-=" { RTOKEN(MINUSEQ);}
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<BOTH,SCRIPT,EXPRESSION>"*=" { RTOKEN(MULTEQ);}
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<BOTH,SCRIPT,EXPRESSION>"/=" { RTOKEN(DIVEQ);}
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<BOTH,SCRIPT,EXPRESSION>"&=" { RTOKEN(ANDEQ);}
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<BOTH,SCRIPT,EXPRESSION>"|=" { RTOKEN(OREQ);}
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<BOTH,SCRIPT,EXPRESSION>"&&" { RTOKEN(ANDAND);}
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<BOTH,SCRIPT,EXPRESSION>">" { RTOKEN('>');}
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<MRI,BOTH,SCRIPT,EXPRESSION>"," { RTOKEN(',');}
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<BOTH,SCRIPT,EXPRESSION>"&" { RTOKEN('&');}
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<BOTH,SCRIPT,EXPRESSION>"|" { RTOKEN('|');}
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<BOTH,SCRIPT,EXPRESSION>"~" { RTOKEN('~');}
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<BOTH,SCRIPT,EXPRESSION>"!" { RTOKEN('!');}
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<BOTH,SCRIPT,EXPRESSION>"?" { RTOKEN('?');}
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<BOTH,SCRIPT,EXPRESSION>"*" { RTOKEN('*');}
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<BOTH,SCRIPT,EXPRESSION>"+" { RTOKEN('+');}
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<BOTH,SCRIPT,EXPRESSION>"-" { RTOKEN('-');}
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<BOTH,SCRIPT,EXPRESSION>"/" { RTOKEN('/');}
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<BOTH,SCRIPT,EXPRESSION>"%" { RTOKEN('%');}
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<BOTH,SCRIPT,EXPRESSION>"<" { RTOKEN('<');}
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<MRI,BOTH,SCRIPT,EXPRESSION>"=" { RTOKEN('=');}
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<BOTH,SCRIPT,EXPRESSION>"}" { RTOKEN('}') ; }
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<BOTH,SCRIPT,EXPRESSION>"{" { RTOKEN('{'); }
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<BOTH,SCRIPT,EXPRESSION>")" { RTOKEN(')');}
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<BOTH,SCRIPT,EXPRESSION>"(" { RTOKEN('(');}
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<BOTH,SCRIPT,EXPRESSION>":" { RTOKEN(':'); }
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<BOTH,SCRIPT,EXPRESSION>";" { RTOKEN(';');}
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<BOTH,SCRIPT>"MEMORY" { RTOKEN(MEMORY);}
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<BOTH,SCRIPT>"ORIGIN" { RTOKEN(ORIGIN);}
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<BOTH,SCRIPT>"BLOCK" { RTOKEN(BLOCK);}
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<BOTH,SCRIPT>"LENGTH" { RTOKEN(LENGTH);}
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<EXPRESSION,BOTH,SCRIPT>"ALIGN" { RTOKEN(ALIGN_K);}
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<EXPRESSION,BOTH,SCRIPT>"ADDR" { RTOKEN(ADDR);}
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<BOTH,SCRIPT>"ENTRY" { RTOKEN(ENTRY);}
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<EXPRESSION,BOTH,SCRIPT>"NEXT" { RTOKEN(NEXT);}
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<EXPRESSION,BOTH,SCRIPT>"sizeof_headers" { RTOKEN(SIZEOF_HEADERS);}
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<EXPRESSION,BOTH,SCRIPT>"SIZEOF_HEADERS" { RTOKEN(SIZEOF_HEADERS);}
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<BOTH,SCRIPT>"MAP" { RTOKEN(MAP);}
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<EXPRESSION,BOTH,SCRIPT>"SIZEOF" { RTOKEN(SIZEOF);}
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<BOTH,SCRIPT>"TARGET" { RTOKEN(TARGET_K);}
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<BOTH,SCRIPT>"SEARCH_DIR" { RTOKEN(SEARCH_DIR);}
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<BOTH,SCRIPT>"OUTPUT" { RTOKEN(OUTPUT);}
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<BOTH,SCRIPT>"INPUT" { RTOKEN(INPUT);}
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<EXPRESSION,BOTH,SCRIPT>"DEFINED" { RTOKEN(DEFINED);}
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<BOTH,SCRIPT>"CREATE_OBJECT_SYMBOLS" { RTOKEN(CREATE_OBJECT_SYMBOLS);}
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<BOTH,SCRIPT>"CONSTRUCTORS" { RTOKEN( CONSTRUCTORS);}
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<BOTH,SCRIPT>"FORCE_COMMON_ALLOCATION" { RTOKEN(FORCE_COMMON_ALLOCATION);}
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<BOTH,SCRIPT>"SECTIONS" { RTOKEN(SECTIONS);}
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<BOTH,SCRIPT>"FILL" { RTOKEN(FILL);}
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<BOTH,SCRIPT>"STARTUP" { RTOKEN(STARTUP);}
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<BOTH,SCRIPT>"OUTPUT_FORMAT" { RTOKEN(OUTPUT_FORMAT);}
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<BOTH,SCRIPT>"OUTPUT_ARCH" { RTOKEN( OUTPUT_ARCH);}
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<BOTH,SCRIPT>"HLL" { RTOKEN(HLL);}
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<BOTH,SCRIPT>"SYSLIB" { RTOKEN(SYSLIB);}
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<BOTH,SCRIPT>"FLOAT" { RTOKEN(FLOAT);}
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<BOTH,SCRIPT>"QUAD" { RTOKEN( QUAD);}
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<BOTH,SCRIPT>"LONG" { RTOKEN( LONG);}
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<BOTH,SCRIPT>"SHORT" { RTOKEN( SHORT);}
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<BOTH,SCRIPT>"BYTE" { RTOKEN( BYTE);}
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<BOTH,SCRIPT>"NOFLOAT" { RTOKEN(NOFLOAT);}
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<EXPRESSION,BOTH,SCRIPT>"NOLOAD" { RTOKEN(NOLOAD);}
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<BOTH,SCRIPT>"DSECT" { RTOKEN(DSECT);}
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<BOTH,SCRIPT>"COPY" { RTOKEN(COPY);}
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<BOTH,SCRIPT>"INFO" { RTOKEN(INFO);}
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<BOTH,SCRIPT>"OVERLAY" { RTOKEN(OVERLAY);}
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<BOTH,SCRIPT>"o" { RTOKEN(ORIGIN);}
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<BOTH,SCRIPT>"org" { RTOKEN(ORIGIN);}
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<BOTH,SCRIPT>"l" { RTOKEN( LENGTH);}
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<BOTH,SCRIPT>"len" { RTOKEN( LENGTH);}
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<BOTH,SCRIPT>"INCLUDE" { RTOKEN(INCLUDE);}
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<EXPRESSION,BOTH,SCRIPT>"AT" { RTOKEN(AT);}
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<BOTH,SCRIPT>"PROVIDE" { RTOKEN(PROVIDE); }
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<MRI>"\n" { ++ lineno; RTOKEN(NEWLINE); }
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<MRI>"\r" { ++ lineno; RTOKEN(NEWLINE); }
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<MRI>"*".* { /* Mri comment line */ }
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<MRI>"END" { RTOKEN(ENDWORD); }
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<MRI>"ALIGNMOD" { RTOKEN(ALIGNMOD);}
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<MRI>"ALIGN" { RTOKEN(ALIGN_K);}
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<MRI>"CHIP" { RTOKEN(CHIP); }
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<MRI>"BASE" { RTOKEN(BASE); }
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<MRI>"ALIAS" { RTOKEN(ALIAS); }
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<MRI>"TRUNCATE" { RTOKEN(TRUNCATE); }
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<MRI>"LOAD" { RTOKEN(LOAD); }
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<MRI>"PUBLIC" { RTOKEN(PUBLIC); }
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<MRI>"ORDER" { RTOKEN(ORDER); }
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<MRI>"NAME" { RTOKEN(NAMEWORD); }
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<MRI>"FORMAT" { RTOKEN(FORMAT); }
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<MRI>"LIST".* { RTOKEN(LIST); /* LIST and ignore to end of line */ }
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<MRI>"SECT" { RTOKEN(SECT); }
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<EXPRESSION,BOTH,SCRIPT,MRI>"ABSOLUTE" { RTOKEN(ABSOLUTE); }
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<MRI>"end" { RTOKEN(ENDWORD); }
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<MRI>"chip" { RTOKEN(CHIP); }
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<MRI>"load" { RTOKEN(LOAD); }
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<MRI>"order" { RTOKEN(ORDER); }
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<MRI>"name" { RTOKEN(NAMEWORD); }
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<MRI>"format" { RTOKEN(FORMAT); }
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<MRI>"list".* { RTOKEN(LIST); /* LIST and ignore to end of line */ }
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<MRI>"sect" { RTOKEN(SECT); }
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<EXPRESSION,BOTH,SCRIPT,MRI>"absolute" { RTOKEN(ABSOLUTE); }
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<MRI>{FILENAMECHAR1}{NOCFILENAMECHAR}* {
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/* Filename without commas, needed to parse mri stuff */
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yylval.name = buystring(yytext);
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return NAME;
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}
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<BOTH,EXPRESSION>{FILENAMECHAR1}{FILENAMECHAR}* {
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yylval.name = buystring(yytext);
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return NAME;
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}
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<SCRIPT>{FILENAMECHAR}* { yylval.name = buystring(yytext);
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return NAME;
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}
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<EXPRESSION,BOTH,SCRIPT>"\""[^\"]*"\"" {
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/* No matter the state, quotes
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give what's inside */
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yylval.name = buystring(yytext+1);
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yylval.name[yyleng-2] = 0;
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return NAME;
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}
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<BOTH,SCRIPT,EXPRESSION>"\n" { lineno++;}
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<BOTH,SCRIPT,EXPRESSION>"\r" { lineno++;}
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<MRI,BOTH,SCRIPT,EXPRESSION>[ \t]
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<<EOF>> {
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include_stack_ptr--;
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if (include_stack_ptr == 0)
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{
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yyterminate();
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}
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else
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{
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yy_switch_to_buffer(include_stack[include_stack_ptr]);
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}
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BEGIN(SCRIPT);
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ldfile_input_filename = file_name_stack[include_stack_ptr-1];
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return END;
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}
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<SCRIPT,MRI>. lex_warn_invalid(" in script", yytext);
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<EXPRESSION,DEFSYMEXP,BOTH>. lex_warn_invalid(" in expression", yytext);
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%%
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/* Switch flex to reading script file NAME, open on FILE,
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saving the current input info on the include stack. */
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|
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void
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lex_push_file (file, name)
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FILE *file;
|
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char *name;
|
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{
|
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if (include_stack_ptr >= MAX_INCLUDE_DEPTH)
|
||
{
|
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einfo("%F:includes nested too deeply\n");
|
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}
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file_name_stack[include_stack_ptr] = name;
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include_stack[include_stack_ptr] = YY_CURRENT_BUFFER;
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include_stack_ptr++;
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yyin = file;
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yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
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BEGIN (SCRIPT);
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}
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||
|
||
/* Return a newly created flex input buffer containing STRING,
|
||
which is SIZE bytes long. */
|
||
|
||
static YY_BUFFER_STATE
|
||
yy_create_string_buffer (string, size)
|
||
CONST char *string;
|
||
size_t size;
|
||
{
|
||
YY_BUFFER_STATE b;
|
||
|
||
/* Calls to m-alloc get turned by sed into xm-alloc. */
|
||
b = (YY_BUFFER_STATE) malloc (sizeof (struct yy_buffer_state));
|
||
b->yy_input_file = 0;
|
||
b->yy_buf_size = size;
|
||
|
||
/* yy_ch_buf has to be 2 characters longer than the size given because
|
||
we need to put in 2 end-of-buffer characters. */
|
||
b->yy_ch_buf = (YY_CHAR *) malloc ((unsigned) (b->yy_buf_size + 3));
|
||
|
||
b->yy_ch_buf[0] = '\n';
|
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strcpy (b->yy_ch_buf+1, string);
|
||
b->yy_ch_buf[size+1] = YY_END_OF_BUFFER_CHAR;
|
||
b->yy_ch_buf[size+2] = YY_END_OF_BUFFER_CHAR;
|
||
b->yy_n_chars = size+1;
|
||
b->yy_buf_pos = &b->yy_ch_buf[1];
|
||
b->yy_eof_status = EOF_NOT_SEEN;
|
||
|
||
return b;
|
||
}
|
||
|
||
/* Switch flex to reading from STRING, saving the current input info
|
||
on the include stack. */
|
||
|
||
void
|
||
lex_redirect (string)
|
||
CONST char *string;
|
||
{
|
||
YY_BUFFER_STATE tmp;
|
||
|
||
yy_init = 0;
|
||
if (include_stack_ptr >= MAX_INCLUDE_DEPTH)
|
||
{
|
||
einfo("%F: macros nested too deeply\n");
|
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}
|
||
file_name_stack[include_stack_ptr] = "redirect";
|
||
include_stack[include_stack_ptr] = YY_CURRENT_BUFFER;
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include_stack_ptr++;
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tmp = yy_create_string_buffer (string, strlen (string));
|
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yy_switch_to_buffer (tmp);
|
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BEGIN (SCRIPT);
|
||
}
|
||
|
||
/* Functions to switch to a different flex start condition,
|
||
saving the current start condition on `state_stack'. */
|
||
|
||
static int state_stack[MAX_INCLUDE_DEPTH * 2];
|
||
static int *state_stack_p = state_stack;
|
||
|
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void
|
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ldlex_script ()
|
||
{
|
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*(state_stack_p)++ = yy_start;
|
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BEGIN (SCRIPT);
|
||
}
|
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|
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void
|
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ldlex_mri_script ()
|
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{
|
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*(state_stack_p)++ = yy_start;
|
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BEGIN (MRI);
|
||
}
|
||
|
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void
|
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ldlex_defsym ()
|
||
{
|
||
*(state_stack_p)++ = yy_start;
|
||
BEGIN (DEFSYMEXP);
|
||
}
|
||
|
||
void
|
||
ldlex_expression ()
|
||
{
|
||
*(state_stack_p)++ = yy_start;
|
||
BEGIN (EXPRESSION);
|
||
}
|
||
|
||
void
|
||
ldlex_both ()
|
||
{
|
||
*(state_stack_p)++ = yy_start;
|
||
BEGIN (BOTH);
|
||
}
|
||
|
||
void
|
||
ldlex_popstate ()
|
||
{
|
||
yy_start = *(--state_stack_p);
|
||
}
|
||
|
||
|
||
/* Place up to MAX_SIZE characters in BUF and return in *RESULT
|
||
either the number of characters read, or 0 to indicate EOF. */
|
||
|
||
static void
|
||
yy_input (buf, result, max_size)
|
||
char *buf;
|
||
int *result;
|
||
int max_size;
|
||
{
|
||
*result = 0;
|
||
if (yy_current_buffer->yy_input_file)
|
||
{
|
||
if (yyin)
|
||
{
|
||
*result = read (fileno (yyin), (char *) buf, max_size);
|
||
if (*result < 0)
|
||
einfo ("%F%P: read in flex scanner failed");
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Eat the rest of a C-style comment. */
|
||
|
||
static void
|
||
comment ()
|
||
{
|
||
int c;
|
||
|
||
while (1)
|
||
{
|
||
c = input();
|
||
while (c != '*' && c != EOF)
|
||
{
|
||
if (c == '\n' || c == '\r')
|
||
lineno++;
|
||
c = input();
|
||
}
|
||
|
||
if (c == '*')
|
||
{
|
||
c = input();
|
||
while (c == '*')
|
||
c = input();
|
||
if (c == '/')
|
||
break; /* found the end */
|
||
}
|
||
|
||
if (c == '\n' || c == '\r')
|
||
lineno++;
|
||
|
||
if (c == EOF)
|
||
{
|
||
einfo( "%F%P: EOF in comment\n");
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Warn the user about a garbage character WHAT in the input
|
||
in context WHERE. */
|
||
|
||
static void
|
||
lex_warn_invalid (where, what)
|
||
char *where, *what;
|
||
{
|
||
fprintf(stderr,
|
||
"%s: ignoring invalid character `%s'%s\n",
|
||
program_name, what, where);
|
||
}
|