Statement Code Generation using Lex Program

Compiler Construction Lab Manual / Statement Code Generation using Lex Program

Program Name

Write a Compiler Construction Program for Statement Code Generation using Lex Program.

Theory
Statement Code Generation using Lex program sections.

Program Code


#include<stdio.h> main()
{
char stmt[10]; printf("enter the c stmt\n");
gets(stmt);
switch(stmt[3])
{
case '+':
printf("\n LOAD %c,R1",stmt[2]);
printf("\n ADD %c,R1",stmt[4]);
printf("\n STORE R1,%c\n",stmt[0]);break;
case '-':
printf("\n LOAD %c,R1",stmt[2]);
printf("\n SUB %c,R1",stmt[4]);
printf("\n STORE R1,%c\n",stmt[0]);break;
case '*':
printf("\n LOAD %c,R1",stmt[2]);
printf("\n MUL %c,R1",stmt[4]);
printf("\nSTORE R1,%c\n",stmt[0]);break;
case '/':
printf("\n LOAD %c,R1",stmt[2]);
printf("\n DIV %c,R1",stmt[4]);
printf("\n STORE R1,%c\n",stmt[0]);break;
}
}

Saving: vi codegen.l

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

Input
enter the c stmt a=b+c

Output
LOAD b,R1
ADD c,R1
STORE R1,a

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