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yacc.y
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%{
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define RUN 1
#define CREATE 0
int yylex();
int yyerror(char *s);
extern FILE *yyin;
extern int yylineno;
extern char yytext[1000];
char output[10000];
int is_err = 0;
%}
%union{
int a;
float floatValue;
char *stringValue;
}
%token <floatValue> I_NUM
%token <stringValue> ID
%token <stringValue> CH
%token INT FLOAT CHAR
%token IF
%token <floatValue> F_NUM
%left '/' '*'
%left '+' '-'
%right '='
%right '>' '<'
%right LE GE EQ NE
%%
start: function {strcat(output,"RET\n");}
| declaration {strcat(output,"RET\n");}
;
declaration: type expr
| expr
| error
;
expr: ID'='ID';' {
char temp[100];
sprintf(temp,"MOV %s,%s \n",$1,$3);
strcat(output,temp);
}
| ID'='I_NUM';'{
char temp[100];
sprintf(temp,"MOV %s,%g\n",$1,$3);
strcat(output,temp);
}
| ID'='CH';'{
char temp[100];
sprintf(temp,"MOV %s,%s\n",$1,$3);
strcat(output,temp);
}
| ID'='ID'/'ID';'{
char temp[100]; sprintf(temp,"DIV %s,%s\n",$3,$5);
char temp1[100]; sprintf(temp1,"MOV %s,%s\n",$1,$3);
strcat(output,temp); strcat(output,temp1);
}
| ID'='ID'/'I_NUM';'{
char temp[100]; sprintf(temp,"DIV %s,%g\n",$3,$5);
char temp1[100]; sprintf(temp1,"MOV %s,%s\n",$1,$3);
strcat(output,temp); strcat(output,temp1);
}
| ID'='I_NUM'/'I_NUM';'{
char temp[100]; sprintf(temp,"DIV %g,%g\n",$3,$5);
float res = (float)$3/$5;
char temp1[100]; sprintf(temp1,"MOV %s,%g\n",$1,res);
strcat(output,temp); strcat(output,temp1);
}
| ID'='ID'*'ID';'{
char temp[100]; sprintf(temp,"MUL %s,%s\n",$3,$5);
char temp1[100]; sprintf(temp1,"MOV %s,%s\n",$1,$3);
strcat(output,temp); strcat(output,temp1);
}
| ID'='ID'*'I_NUM';'{
char temp[100]; sprintf(temp,"MUL %s,%g\n",$3,$5);
char temp1[100]; sprintf(temp1,"MOV %s,%s\n",$1,$3);
strcat(output,temp); strcat(output,temp1);
}
| ID'='I_NUM'*'I_NUM';'{
char temp[100]; sprintf(temp,"MUL %g,%g\n",$3,$5);
float res = (float)$3*$5;
char temp1[100]; sprintf(temp1,"MOV %s,%g\n",$1,res);
strcat(output,temp); strcat(output,temp1);
}
| ID'='ID'+'ID';'{
char temp[100]; sprintf(temp,"ADD %s,%s\n",$3,$5);
char temp1[100]; sprintf(temp1,"MOV %s,%s\n",$1,$3);
strcat(output,temp); strcat(output,temp1);
}
| ID'='ID'+'I_NUM';'{
char temp[100]; sprintf(temp,"ADDV %s,%g\n",$3,$5);
char temp1[100]; sprintf(temp1,"MOV %s,%s\n",$1,$3);
strcat(output,temp); strcat(output,temp1);
}
| ID'='I_NUM'+'I_NUM';'{
char temp[100]; sprintf(temp,"ADD %g,%g\n",$3,$5);
float res = $3+$5;
char temp1[100]; sprintf(temp1,"MOV %s,%g\n",$1,res);
strcat(output,temp); strcat(output,temp1);
}
| ID'='ID'-'ID';'{
char temp[100]; sprintf(temp,"SUB %s,%s\n",$3,$5);
char temp1[100]; sprintf(temp1,"MOV %s,%s\n",$1,$3);
strcat(output,temp); strcat(output,temp1);
}
| ID'='ID'-'I_NUM';'{
char temp[100]; sprintf(temp,"SUB %s,%g\n",$3,$5);
char temp1[100]; sprintf(temp1,"MOV %s,%s\n",$1,$3);
strcat(output,temp); strcat(output,temp1);
}
| ID'='I_NUM'-'I_NUM';'{
char temp[100]; sprintf(temp,"SUB %g,%g\n",$3,$5);
float res = $3-$5;
char temp1[100]; sprintf(temp1,"MOV %s,%g\n",$1,res);
strcat(output,temp); strcat(output,temp1);
}
| ID'='ID'>'ID';' {
char temp[100]; sprintf(temp,"GREATER %s,%s\n",$3,$5);
strcat(output,temp);
}
| ID'='ID'<'ID';' {char temp[100]; sprintf(temp,"SMALLER %s,%s\n",$3,$5);
strcat(output,temp);}
| ID'='ID GE ID';' {char temp[100]; sprintf(temp,"GE %s,%s\n",$3,$5);
strcat(output,temp);}
| ID'='ID LE ID';' {char temp[100]; sprintf(temp,"LE %s,%s\n",$3,$5);
strcat(output,temp);}
| ID'='ID EQ ID';' {char temp[100]; sprintf(temp,"EQ %s,%s\n",$3,$5);
strcat(output,temp);}
| ID'='ID NE ID';' {char temp[100]; sprintf(temp,"NE %s,%s\n",$3,$5);
strcat(output,temp);}
| ID';'
;
type: INT
| FLOAT
| CHAR
;
function: type ID '('')' cstmt
;
stmt: declaration
| condition
;
stmtlist: stmtlist stmt
|
;
cstmt: '{'stmtlist'}'
;
condition: IF '(' if_cond ')' cstmt
;
if_cond: ID'='ID
| num'>'num
| num'<'num
| num GE num
| num LE num
| num EQ num
| num NE num
| num
;
num: I_NUM
| ID
| CH
;
%%
#include <ctype.h>
int main(int argc, char *argv[]){
memset(output,'\0',10000);
int show_assembly = RUN;
if(argc == 3){
show_assembly = argv[2][0] - '0';
}
yyin = fopen(argv[1],"r");
if(yyin == NULL){
printf("File Does not exist\n");
exit(0);
}
yyparse();
if(!is_err){
if(show_assembly == RUN){
printf("%s",output);
printf("Number of lines : %d\n",yylineno-1);
}
else{
printf("NO ERROR\n");
}
}
fclose(yyin);
return 0;
}
int yyerror(char *s){
is_err = 1;
printf("%d : %s \n",yylineno,s);
return 0;
}