CODGEN.C

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
struct quadraple
{
	int pos;
	char op;
	char arg1[5];
	char arg2[5];
	char result[5];
}quad[15];
int n=0;
void assignment(int);
void uminus(int );
void explore();
void codegen(const char*,int);
char tuple[15][15];
int main(void)
{
	FILE *src;
	int nRetInd,i;
	char str[15];
	src=fopen("int.txt","r");
	fscanf(src,"%s",str);
	while(!feof(src))
	{
		strcpy(tuple[n++],str);
		fscanf(src,"%s",str);
	}
	printf("INPUT:\nIntermiate codes:\n");
	for(i=0;i<n;i++)
		printf("%s\n",tuple[i]);
	explore();
	printf("OUTPUT:\n");
	printf("Quadruple: \n");
	printf("pos\topr\targ1\targ2\tresult\n");
	for(i=0;i<n;i++)
		printf("\n%d\t%c\t%s\t%s\t%s",quad[i].pos,quad[i].op,quad[i].arg1,quad[i].arg2,quad[i].result);
	i=0;
	printf("\n\ncode generated :\n");
	while(i<n)
	{
		if(quad[i].op=='+')
		{
			char op[5]="ADD";
			codegen(op,i);
		}
		if(quad[i].op=='=')
			assignment(i);
		if(quad[i].op=='-')
				if(!strcmp(quad[i].arg2,"\0"))
					uminus(i);
				else
				{
					char op[5]="SUB";
					codegen(op,i);
				}
		if(quad[i].op=='*')
		{
			char op[5]="MUL";
			codegen(op,i);
		}
		if(quad[i].op=='/')
		{
			char op[5]="DIV";
			codegen(op,i);
		}
	i++;
	}
	fcloseall();
	return 0;
}
void codegen(const char* op, int t)
{
char str[25];
printf("MOV %s,R0\n", quad[t].arg1);
printf("%s %s,R0\n", op, quad[t].arg2);
printf("MOV R0,%s\n", quad[t].result);
}
void assignment(int t)
{
	char str[25];
	printf("MOV %s,%s\n",quad[t].result,quad[t].arg1);
}
void uminus(int t)
{
	char str[25];
	printf("MOV R0,0\n");
	printf("SUB %s,R0\n",quad[t].arg1);
	printf("MOV R0,%s\n",quad[t].result);
}

void explore()
{
	int i,j,t,t1,t2;
	for(i=0;i<n;i++)
	{
		quad[i].pos=i;
		for(j=0,t=0;j<strlen(tuple[i])&&tuple[i][j]!='=';j++)
		{
			quad[i].result[t++]=tuple[i][j];
		}
		t1=j;
		quad[i].result[t]='\0';
		if(tuple[i][j]=='=')
		{
			quad[i].op='=';
		}
		if(tuple[i][j+1]=='+'||tuple[i][j+1]=='-'||tuple[i][j+1]=='*'||tuple[i][j+1]=='/')
		{
			quad[i].op=tuple[i][j+1];
			t1=j+1;
		}
		for(j=t1+1,t=0;j<strlen(tuple[i])&&tuple[i][j]!='+'&&tuple[i][j]!='-'&&tuple[i][j]!='*'&&tuple[i][j]!='/';j++)
		{
			quad[i].arg1[t++]=tuple[i][j];
		}
		t2=j;
		quad[i].arg1[t]='\0';
		if(tuple[i][j]=='+'||tuple[i][j]=='-'||tuple[i][j]=='*'||tuple[i][j]=='/')
			{
				quad[i].op=tuple[i][j];
			}
		for(j=t2+1,t=0;j<strlen(tuple[i]);j++)
		{
			quad[i].arg2[t++]=tuple[i][j];
		}
		quad[i].arg2[t]='\0';
	}
}