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finCode.c
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finCode.c
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#include "finCode.h"
int dataLoc(char* name)
{
if(name[0]=='#')
return -1;
if(name[0]=='*'||name[0]=='&')
name++;
for(int i=0; i<dataNum; i++){
if(!strcmp(name, dataFlow[i].name))
return dataFlow[i].location;
}
return -1;
}
void dataAdd(char* name, int size)
{
if(name[0]=='#')
return;
if(name[0]=='*'||name[0]=='&')
name++;
if(dataLoc(name)!=-1)
return;
dataFlow[dataNum].location = totalSize;
totalSize += size;
strcpy(dataFlow[dataNum++].name, name);
}
void regAlloc(FILE *target_file, char* name, int num)
{
char temp[8];
sprintf(temp, "$t%d", num);
if(name[0]=='*'){
fprintf(target_file, "lw %s,%d($sp)\n", temp, dataLoc(name));
fprintf(target_file, "add %s,%s,$sp\n", temp, temp);
fprintf(target_file, "lw %s,0(%s)\n", temp, temp);
}
else if(name[0]=='&'){
fprintf(target_file, "li %s,%d\n", temp, dataLoc(name));
}
else if(name[0]=='#'){
fprintf(target_file, "li %s,%s\n", temp, &name[1]);
}
else{
fprintf(target_file, "lw %s,%d($sp)\n", temp, dataLoc(name));
}
}
void finCode(FILE *target_file, InterCodes* pCode)
{
codeHead = pCode;
fprintf(target_file, "%s\n",".data");
fprintf(target_file, "%s\n","_prompt: .asciiz \"Enter an integer:\"");
fprintf(target_file, "%s\n","_ret: .asciiz \"\\n\"");
fprintf(target_file, "%s\n",".globl main");
fprintf(target_file, "%s\n",".text");
fprintf(target_file, "%s\n","read:");
fprintf(target_file, "%s\n","li $v0, 4");
fprintf(target_file, "%s\n","la $a0, _prompt");
fprintf(target_file, "%s\n","syscall");
fprintf(target_file, "%s\n","li $v0, 5");
fprintf(target_file, "%s\n","syscall");
fprintf(target_file, "%s\n","jr $ra");
fprintf(target_file, "%s\n","write:");
fprintf(target_file, "%s\n","li $v0, 1");
fprintf(target_file, "%s\n","syscall");
fprintf(target_file, "%s\n","li $v0, 4");
fprintf(target_file, "%s\n","la $a0, _ret");
fprintf(target_file, "%s\n","syscall");
fprintf(target_file, "%s\n","move $v0, $0");
fprintf(target_file, "%s\n","jr $ra");
InterCodes *p = codeHead->next, *q;
do{
q = p->next;
while(q != NULL){
if(!strcmp(q->args[0], "FUNCTION"))
break;
q = q->next;
}
instructions(target_file, p, q);
p = q;
}while(p != NULL);
}
/* Convert the intermediate codes to final instructions */
void instructions(FILE *target_file, InterCodes* pHead, InterCodes* pTail)
{
fprintf(target_file, "%s:\n", pHead->args[3]);
dataADDs(pHead, pTail);
fprintf(target_file, "addi $sp, $sp, -%d\n", totalSize);
instruction(target_file, pHead, pTail);
}
void dataADDs(InterCodes* pHead, InterCodes* pTail)
{
InterCodes *pCode = pHead->next;
while(pCode != pTail){
int type = typeCode(pCode->args[0]);
switch(type){
case 0: //"GOTO" (GOTO , , , x)
dataAdd(pCode->args[3], 4);
break;
case 8:{ //DEC (DEC, size, , x)
int temp = strtol(pCode->args[1], NULL, 10);
dataAdd(pCode->args[3], temp);
break;
}
case 9: //":=" (:=, y , , x) (:=, &y, , x) (:=, *y, , x) (:=, y, , *x)
dataAdd(pCode->args[1], 4);
dataAdd(pCode->args[3], 4);
break;
case 10: //"CALL" (CALL, f, , x)
dataAdd(pCode->args[3], 4);
break;
case 11: case 12: case 13: case 14: // "+" (+, y, z, x) "-" (-, y, z, x) "*" (*, y, z, x) "/" (/, y, z, x)
dataAdd(pCode->args[1], 4);
dataAdd(pCode->args[2], 4);
dataAdd(pCode->args[3], 4);
break;
case 15: case 16: case 17: case 18: case 19: case 20: //(<, x, y, z) (>, x, y, z) (Equal, x, y, z) (UnEqual, x, y, z) (LE, x, y, z) (GE, x, y, z)
dataAdd(pCode->args[1], 4);
dataAdd(pCode->args[2], 4);
break;
default: ;
}
pCode = pCode->next;
}
}
void instruction(FILE *target_file, InterCodes* pHead, InterCodes* pTail)
{
InterCodes *pCode = pHead->next;
while(pCode != pTail){
int type = typeCode(pCode->args[0]);
switch(type){
case 0: //"GOTO" (GOTO , , , x)
fprintf(target_file, "j %s\n", pCode->args[3]);
break;
case 1: //return
regAlloc(target_file, pCode->args[3], 0);
fprintf(target_file, "move $v0,$t0\n");
fprintf(target_file, "addi $sp, $sp, %d\n", totalSize);
fprintf(target_file, "jr $ra\n");
break;
case 2: //ARG
regAlloc(target_file, pCode->args[3], 0);
fprintf(target_file, "move $a%d,$t0\n", argCount);
argCount++;
break;
case 3: { //PARAM
int paraCount = 0;
InterCodes *q = pCode;
while(!strcmp(q->next->args[0], "PARAM")){
q = q->next;
paraCount++;
}
fprintf(target_file, "sw $a%d,%d($sp)\n", paraCount, dataLoc(pCode->args[3]));
break;
}
case 4: //READ
fprintf(target_file, "addi $sp, $sp, -4\n");
fprintf(target_file, "sw $ra, 0($sp)\n");
fprintf(target_file, "jal read\n");
fprintf(target_file, "lw $ra, 0($sp)\n");
fprintf(target_file, "addi $sp, $sp, 4\n");
if(pCode->args[3][0] == '*'){
fprintf(target_file, "lw $t0, %d($sp)\n", dataLoc(pCode->args[3]));
fprintf(target_file, "add $t0, $t0, $sp\n");
fprintf(target_file, "sw $v0, 0($t0)\n");
}
else
fprintf(target_file, "sw $v0,%d($sp)\n",dataLoc(pCode->args[3]));
break;
case 5: //WRITE
regAlloc(target_file, pCode->args[3], 0);
fprintf(target_file, "move $a0, $t0\n");
fprintf(target_file, "addi $sp, $sp, -4\n");
fprintf(target_file, "sw $ra, 0($sp)\n");
fprintf(target_file, "jal write\n");
fprintf(target_file, "lw $ra, 0($sp)\n");
fprintf(target_file, "addi $sp, $sp, 4\n");
break;
case 6:
fprintf(target_file, "%s:\n", pCode->args[3]);
break;
case 8: //DEC (DEC, size, , x)
fprintf(target_file, "%s:\n", pCode->args[3]);
break;
case 9: //":=" (:=, y , , x) (:=, &y, , x) (:=, *y, , x) (:=, y, , *x)
regAlloc(target_file, pCode->args[1], 0);
if(pCode->args[3][0]=='*'){
fprintf(target_file, "lw $t1, %d($sp)\n", dataLoc(pCode->args[3]));
fprintf(target_file, "add $t1, $t1, $sp\n");
fprintf(target_file, "sw $t0, 0($t1)\n");
}
else
fprintf(target_file, "sw $t0, %d($sp)\n", dataLoc(pCode->args[3]));
break;
case 10: //"CALL" (CALL, f, , x)
argCount = 0;
fprintf(target_file, "addi $sp, $sp, -4\n");
fprintf(target_file, "sw $ra, 0($sp)\n");
fprintf(target_file, "jal %s\n",pCode->args[1]);
fprintf(target_file, "lw $ra, 0($sp)\n");
fprintf(target_file, "addi $sp, $sp, 4\n");
if(pCode->args[3][0]=='*'){
fprintf(target_file, "lw $t0, %d($sp)\n", dataLoc(pCode->args[3]));
fprintf(target_file, "add $t0, $t0 ,$sp\n");
fprintf(target_file, "sw $v0, 0($t0)\n");
}
else
fprintf(target_file, "sw $v0,%d($sp)\n", dataLoc(pCode->args[3]));
break;
case 11: // "+" (+, y, z, x)
regAlloc(target_file, pCode->args[1], 0);
regAlloc(target_file, pCode->args[2], 1);
fprintf(target_file, "add $t0, $t0, $t1\n");
if(pCode->args[3][0] == '*'){
fprintf(target_file, "lw $t1, %d($sp)\n", dataLoc(pCode->args[3]));
fprintf(target_file, "add $t1, $t1 ,$sp\n");
fprintf(target_file, "sw $t0, 0($t1)\n");
}
else
fprintf(target_file, "sw $t0, %d($sp)\n", dataLoc(pCode->args[3]));
break;
case 12: //"-" (-, y, z, x)
regAlloc(target_file, pCode->args[1], 0);
regAlloc(target_file, pCode->args[2], 1);
fprintf(target_file, "sub $t0, $t0, $t1\n");
if(pCode->args[3][0] == '*'){
fprintf(target_file, "lw $t1, %d($sp)\n", dataLoc(pCode->args[3]));
fprintf(target_file, "add $t1, $t1 ,$sp\n");
fprintf(target_file, "sw $t0, 0($t1)\n");
}
else
fprintf(target_file, "sw $t0, %d($sp)\n", dataLoc(pCode->args[3]));
break;
case 13: //"*" (*, y, z, x)
regAlloc(target_file, pCode->args[1], 0);
regAlloc(target_file, pCode->args[2], 1);
fprintf(target_file, "mul $t0, $t0, $t1\n");
if(pCode->args[3][0] == '*'){
fprintf(target_file, "lw $t1, %d($sp)\n", dataLoc(pCode->args[3]));
fprintf(target_file, "add $t1, $t1 ,$sp\n");
fprintf(target_file, "sw $t0, 0($t1)\n");
}
else
fprintf(target_file, "sw $t0, %d($sp)\n", dataLoc(pCode->args[3]));
break;
case 14: // "/" (/, y, z, x)
regAlloc(target_file, pCode->args[1], 0);
regAlloc(target_file, pCode->args[2], 1);
fprintf(target_file, "div $t0, $t1\n");
fprintf(target_file, "mflo $t0\n");
if(pCode->args[3][0] == '*'){
fprintf(target_file, "lw $t1, %d($sp)\n", dataLoc(pCode->args[3]));
fprintf(target_file, "add $t1, $t1 ,$sp\n");
fprintf(target_file, "sw $t0, 0($t1)\n");
}
else
fprintf(target_file, "sw $t0, %d($sp)\n", dataLoc(pCode->args[3]));
break;
case 15: //(<, x, y, z)
regAlloc(target_file, pCode->args[1], 0);
regAlloc(target_file, pCode->args[2], 1);
fprintf(target_file, "%s $t0,$t1,%s\n", "blt", pCode->args[3]);
break;
case 16: //(>, x, y, z)
regAlloc(target_file, pCode->args[1], 0);
regAlloc(target_file, pCode->args[2], 1);
fprintf(target_file, "%s $t0,$t1,%s\n", "bgt", pCode->args[3]);
break;
case 17: //(Equal, x, y, z)
regAlloc(target_file, pCode->args[1], 0);
regAlloc(target_file, pCode->args[2], 1);
fprintf(target_file, "%s $t0,$t1,%s\n", "beq", pCode->args[3]);
break;
case 18: //(UnEqual, x, y, z)
regAlloc(target_file, pCode->args[1], 0);
regAlloc(target_file, pCode->args[2], 1);
fprintf(target_file, "%s $t0,$t1,%s\n", "bne", pCode->args[3]);
break;
case 19: //(LE, x, y, z)
regAlloc(target_file, pCode->args[1], 0);
regAlloc(target_file, pCode->args[2], 1);
fprintf(target_file, "%s $t0,$t1,%s\n", "ble", pCode->args[3]);
break;
case 20: //(GE, x, y, z)
regAlloc(target_file, pCode->args[1], 0);
regAlloc(target_file, pCode->args[2], 1);
fprintf(target_file, "%s $t0,$t1,%s\n", "bge", pCode->args[3]);
break;
default: ;
}
pCode = pCode->next;
}
}