200 lines
4 KiB
Text
200 lines
4 KiB
Text
/* This file contains the description of the 'as_table' parser.
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* It transforms every entry into a C-funtion, for example :
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*
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* and dst:REG, src:EADDR ==> @text1( 0x23);
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* mod_RM( dst->reg, src).
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*
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* ... dst:ACCU, src:DATA ==> @text1( 0x25);
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* @text2(
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* %$(src->expr)).
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*
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* Will be transformed into :
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*
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* and_instr( dst, src)
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* struct t_operand *dst, *src;
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* {
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* if ( REG( dst) && EADDR( src)) {
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* cur_pos += 1;
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* fprint( outfile, "text1( 0x23)");
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* fprint( outfile, ";");
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* mod_RM( dst->reg, src);
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* }
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* else if ( ACCU( dst) && DATA( src)) {
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* cur_pos += 1;
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* fprint( outfile, "text1( 0x25)");
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* fprint( outfile, ";");
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* cur_pos += 2;
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* fprint( outfile, "text2( ");
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* eval( src->expr);
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* fprint( outfile, ")");
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* fprint( outfile, ";");
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* }
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* else
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* error( "No match for and");
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* }
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*
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* At the end of the table a list is generated enumerating all the assembler
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* mnemonics and their corresponding function names.
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*/
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{
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#include "decl.h"
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extern int yylineno, yyleng, yymorfg;
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extern char yytext[];
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}
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%token IDENTIFIER, CALL, CONDITION, IF, ELSIF, ELSE, FI, ARROW, MORE;
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%start table, table;
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%lexical lex_analyzer ;
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table : { init_table();}
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instruction* { end_table();}
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;
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instruction : { clean();}
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first_row
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[ { operand_clean();}
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extra_row
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]* { pr_warning(); out( "}\n\n");}
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;
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first_row : mnemonic { save_instr( yytext, yyleng);}
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[ decl_list]?
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ARROW { pr_header(); pr_restriction();}
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action_list
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;
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extra_row : MORE
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[ decl_list]?
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ARROW { out( "else "); pr_restriction();}
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action_list
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;
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mnemonic : IDENTIFIER
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;
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decl_list : { clear_restriction();}
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declaration
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[ ',' declaration] *7
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;
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declaration : IDENTIFIER { save_name( yytext, yyleng);}
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[ ':'
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IDENTIFIER { save_type( yytext, yyleng);}
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]? { inc_ops();}
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;
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action_list : { out( "{\n");}
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[ action [ ';' action]* ]? '.' { out( "}\n");}
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;
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action : if_statement
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| call
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| subroutine
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;
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/* A function call is just an identifier followed by an expression surrounded
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* by '(' and ')'. CONDITION is a token that matches this construct;
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*/
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subroutine : IDENTIFIER { yymorfg=1;}
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CONDITION { pr_subroutine( yytext);}
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;
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call : '@'
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IDENTIFIER { yymorfg=1;}
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CONDITION { pr_call( yytext);}
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;
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if_statement : IF
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CONDITION { pr_question( yytext);}
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action_list { pr_end();}
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[ ELSIF { pr_els();}
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CONDITION { pr_question( yytext);}
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action_list { pr_end();}
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]*
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[ ELSE { pr_else();}
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action_list { pr_end();}
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]?
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FI
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;
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{
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static int saved = 0, token;
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LLmessage( inserted_token)
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int inserted_token;
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{
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if ( inserted_token == 0) {
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fprint( STDERR, "Sytax error in line %d, ", yylineno);
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print_token( LLsymb);
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fprint( STDERR, " will be deleted!!\n");
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}
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else if ( inserted_token < 0) {
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fprint( STDERR, "Stack overflow in line %d, fatal error!\n",
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yylineno);
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exit( 1);
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}
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else {
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fprint( STDERR, "Sytax error in line %d, ", yylineno);
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print_token( inserted_token);
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fprint( STDERR, " will be inserted!!\n");
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token = LLsymb;
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saved = 1;
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}
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}
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print_token( token)
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int token;
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{
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switch ( token) {
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case IDENTIFIER : fprint( STDERR, "IDENTIFIER %s", yytext);
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break;
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case CALL : fprint( STDERR, "CALL %s", yytext);
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break;
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case CONDITION: fprint( STDERR, "CONDITION %s", yytext);
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break;
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case IF : fprint( STDERR, "@if ");
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break;
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case ELSIF : fprint( STDERR, "@elsif ");
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break;
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case ELSE : fprint( STDERR, "@else ");
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break;
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case FI : fprint( STDERR, "@fi ");
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break;
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case ARROW : fprint( STDERR, "==> ");
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break;
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case MORE : fprint( STDERR, "... ");
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break;
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default : fprint( STDERR, "%c ", token);
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break;
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}
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}
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int lex_analyzer()
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{
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int tok;
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if ( saved) {
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saved = 0;
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return( token);
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}
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else {
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tok = yylex();
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yytext[yyleng] = '\0'; /* strings moeten op een '\0' eindigen */
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return( tok);
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}
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}
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main()
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{
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table();
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return( 0);
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}
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}
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