Code Generation For While lex Program

Compiler Construction Lab Manual / Code Generation For While lex Program

Program Name

Write a Compiler Construction Program for Code Generation For While lex Program.

Theory
Code Generation For While lex Program using lex sections.

Program Code


#include<stdio.h>
#include<string.h>
main()
{
char stmt[2][20];
printf("enter the c stmt:\n");
gets(stmt[0]);
gets(stmt[1]);
if(stmt[0][0]=='w' && stmt[0][1]=='h')
{
printf("\nMOV %c,R1",stmt[0][6]);
printf("\nJMP NEW");
printf("\nBACK:MOV %c,R2",stmt[1][2]);
printf("\nADD %c,R2",stmt[1][4]);
printf("\nSTORE R2,%c",stmt[1][0]);
printf("\nNEW:CMP R1,%c",stmt[0][8]);
printf("\nJE BACK");
}
}

Saving: vi whilecodegen.c

Compiling and Running
cc whilecodegen.c
./a.out

Input
enter the c stmt: while(i=2) x=x+5

Output
MOV i,R1
JMP NEW
BACK:MOV x,R2
ADD 5,R2
STORE R2,x
NEW:CMP R1,2
JE BACK

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