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kaashoek 1988-01-15 15:57:35 +00:00
parent ea4b32d326
commit 31efd16916
1 changed files with 43 additions and 0 deletions
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43
util/ceg/as_parser/pars.g
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@ -1,3 +1,42 @@
/* This file contains the description of the 'as_table' parser.
* It transforms every entry into a C-funtion, for example :
*
* and dst:REG, src:EADDR ==> @text1( 0x23);
* mod_RM( dst->reg, src).
*
* ... dst:ACCU, src:DATA ==> @text1( 0x25);
* @text2(
* %$(src->expr)).
*
* Will be transformed into :
*
* and_instr( dst, src)
* struct t_operand *dst, *src;
* {
* if ( REG( dst) && EADDR( src)) {
* cur_pos += 1;
* fprint( outfile, "text1( 0x23)");
* fprint( outfile, ";");
* mod_RM( dst->reg, src);
* }
* else if ( ACCU( dst) && DATA( src)) {
* cur_pos += 1;
* fprint( outfile, "text1( 0x25)");
* fprint( outfile, ";");
* cur_pos += 2;
* fprint( outfile, "text2( ");
* eval( src->expr);
* fprint( outfile, ")");
* fprint( outfile, ";");
* }
* else
* error( "No match for and");
* }
*
* At the end of the table a list is generated enumerating all the assembler
* mnemonics and their corresponding function names.
*/
{
#include "decl.h"
@ -57,6 +96,10 @@ action : if_statement
| subroutine
;
/* A function call is just an identifier followed by an expression surrounded
* by '(' and ')'. CONDITION is a token that matches this construct;
*/
subroutine : IDENTIFIER { yymorfg=1;}
CONDITION { pr_subroutine( yytext);}
;