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assemble.c
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assemble.c
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#include "assemble.h"
#include "inter_code.h"
#include "syntax_tree.h"
#include "syntax.tab.h"
#include <stdio.h>
#include <stdlib.h>
FILE *f = NULL;
int stack_size = 0;
int param_cnt = 0;
int arg_cnt = 0;
#define _FUNC(name) fprintf(f, "%s:\n", name)
#define _LABEL(i) fprintf(f, "label%d:\n", i)
#define _1AC(instr, a) fprintf(f, " %s %s\n", instr, a)
#define _2AC(instr, a, b) fprintf(f, " %s %s, %s\n", instr, a, b)
#define _2AC_INT(instr, a, b) fprintf(f, " %s %s, %d\n", instr, a, b)
#define _2AC_OFF(instr, a, b, offset) fprintf(f, " %s %s, %d(%s)\n", instr, a, offset, b)
#define _3AC(instr, a, b, c) fprintf(f, " %s %s, %s, %s\n", instr, a, b, c)
#define _3AC_INT(instr, a, b, c) fprintf(f, " %s %s, %s, %d\n", instr, a, b, c)
#define _GOTO(i) fprintf(f, " j label%d\n", i)
#define _BRANCH(instr, a, b, i) fprintf(f, " %s %s, %s, label%d\n", instr, a, b, i)
#define _JAL(name) fprintf(f, " jal %s\n", name)
#define _T0 "$t0"
#define _T1 "$t1"
#define _T2 "$t2"
#define _T3 "$t3"
#define _SP "$sp"
#define _FP "$fp"
#define _RA "$ra"
#define _A0 "$a0"
#define _V0 "$v0"
#define _ZERO "$zero"
#define WARNING fprintf(stderr, "warning: usage of uninitialized memory\n")
void init() {
fprintf(f, ".data\n");
fprintf(f, "_prompt: .asciiz \"Enter an integer: \"\n");
fprintf(f, "_ret: .asciiz \"\\n\"\n");
fprintf(f, ".globl main\n");
fprintf(f, ".text\n");
fprintf(f, "read:\n");
fprintf(f, " li $v0, 4\n");
fprintf(f, " la $a0, _prompt\n");
fprintf(f, " syscall\n");
fprintf(f, " li $v0, 5\n");
fprintf(f, " syscall\n");
fprintf(f, " jr $ra\n\n");
fprintf(f, "write:\n");
fprintf(f, " li $v0, 1\n");
fprintf(f, " syscall\n");
fprintf(f, " li $v0, 4\n");
fprintf(f, " la $a0, _ret\n");
fprintf(f, " syscall\n");
fprintf(f, " move $v0, $0\n");
fprintf(f, " jr $ra\n\n");
}
void into_stack(Operand op) {
stack_size += 4;
op->offset = -stack_size;
}
void print_asm(const char* filename) {
f = fopen(filename, "w");
init();
for (InterCode ic = inter_codes; ic != NULL; ic = ic->next) {
switch (ic->kind) {
case LABEL:
_LABEL(ic->u.unop.op1->u.no);
break;
case FUNC:
param_cnt = 0;
_FUNC(ic->u.func.name);
_3AC("addi", _SP, _SP, "-8");
_2AC_OFF("sw", _RA, _SP, 4);
_2AC_OFF("sw", _FP, _SP, 0);
_3AC("addi", _FP, _SP, "8");
stack_size = 8;
break;
case ASSIGNOP: {
Operand left = ic->u.assign.left;
Operand right = ic->u.assign.right;
if (left != NULL && right != NULL) {
if (left->offset == -1) {
into_stack(left);
}
if (right->kind == CONSTANT) {
_2AC_INT("li", _T0, right->u.no);
} else {
if (right->offset == -1) {
into_stack(right);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, right->offset);
}
_2AC_OFF("sw", _T0, _FP, left->offset);
}
break;
}
case PLUS: {
Operand res = ic->u.binop.op1;
Operand op1 = ic->u.binop.op2;
Operand op2 = ic->u.binop.op3;
if (res != NULL && op1 != NULL && op2 != NULL) {
if (res->offset == -1) {
into_stack(res);
}
if (op1->offset == -1) {
into_stack(op1);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, op1->offset);
if (op2->kind == CONSTANT) {
_2AC_INT("li", _T1, op2->u.no);
} else {
if (op2->offset == -1) {
into_stack(op2);
WARNING;
}
_2AC_OFF("lw", _T1, _FP, op2->offset);
}
_3AC("add", _T0, _T0, _T1);
_2AC_OFF("sw", _T0, _FP, res->offset);
}
break;
}
case MINUS: {
Operand res = ic->u.binop.op1;
Operand op1 = ic->u.binop.op2;
Operand op2 = ic->u.binop.op3;
if (res != NULL && op1 != NULL && op2 != NULL) {
if (res->offset == -1) {
into_stack(res);
}
if (op1->kind == CONSTANT) {
_2AC_INT("li", _T0, op1->u.no);
} else {
if (op1->offset == -1) {
into_stack(op1);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, op1->offset);
}
if (op2->offset == -1) {
into_stack(op2);
WARNING;
}
_2AC_OFF("lw", _T1, _FP, op2->offset);
_3AC("sub", _T0, _T0, _T1);
_2AC_OFF("sw", _T0, _FP, res->offset);
}
break;
}
case STAR: {
Operand res = ic->u.binop.op1;
Operand op1 = ic->u.binop.op2;
Operand op2 = ic->u.binop.op3;
if (res != NULL && op1 != NULL && op2 != NULL) {
if (res->offset == -1) {
into_stack(res);
}
if (op1->offset == -1) {
into_stack(op1);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, op1->offset);
if (op2->kind == CONSTANT) {
_2AC_INT("li", _T1, op2->u.no);
} else {
if (op2->offset == -1) {
into_stack(op2);
WARNING;
}
_2AC_OFF("lw", _T1, _FP, op2->offset);
}
_3AC("mul", _T0, _T0, _T1);
_2AC_OFF("sw", _T0, _FP, res->offset);
}
break;
}
case DIV: {
Operand res = ic->u.binop.op1;
Operand op1 = ic->u.binop.op2;
Operand op2 = ic->u.binop.op3;
if (res != NULL && op1 != NULL && op2 != NULL) {
if (res->offset == -1) {
into_stack(res);
}
if (op1->offset == -1) {
into_stack(op1);
WARNING;
}
if (op2->offset == -1) {
into_stack(op2);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, op1->offset);
_2AC_OFF("lw", _T1, _FP, op2->offset);
_2AC("div", _T0, _T1);
_1AC("mflo", _T2);
_2AC_OFF("sw", _T2, _FP, res->offset);
}
break;
}
case ADDRESS: {
Operand left = ic->u.assign.left;
Operand right = ic->u.assign.right;
if (left != NULL && right != NULL) {
if (right->offset == -1) {
into_stack(right);
WARNING;
}
if (left->offset == -1) {
into_stack(left);
}
_3AC_INT("addi", _T0, _FP, right->offset);
_2AC_OFF("sw", _T0, _FP, left->offset);
}
break;
}
case LOAD: {
Operand left = ic->u.assign.left;
Operand right = ic->u.assign.right;
if (left != NULL && right != NULL) {
if (right->offset == -1) {
into_stack(right);
WARNING;
}
if (left->offset == -1) {
into_stack(left);
}
_2AC_OFF("lw", _T0, _FP, right->offset);
_2AC_OFF("lw", _T0, _T0, 0);
_2AC_OFF("sw", _T0, _FP, left->offset);
}
break;
}
case STORE: {
Operand left = ic->u.assign.left;
Operand right = ic->u.assign.right;
if (left != NULL && right != NULL) {
if (left->offset == -1) {
into_stack(left);
WARNING;
}
if (right->offset == -1) {
into_stack(right);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, left->offset);
_2AC_OFF("lw", _T1, _FP, right->offset);
_2AC_OFF("sw", _T1, _T0, 0);
}
break;
}
case GOTO:
_GOTO(ic->u.unop.op1->u.no);
break;
case GE: {
Operand op1 = ic->u.binop.op1;
Operand op2 = ic->u.binop.op2;
Operand label = ic->u.binop.op3;
if (op1->offset == -1) {
into_stack(op1);
WARNING;
}
if (op2->offset == -1) {
into_stack(op2);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, op1->offset);
_2AC_OFF("lw", _T1, _FP, op2->offset);
_BRANCH("bgt", _T0, _T1, label->u.no);
break;
}
case GEQ: {
Operand op1 = ic->u.binop.op1;
Operand op2 = ic->u.binop.op2;
Operand label = ic->u.binop.op3;
if (op1->offset == -1) {
into_stack(op1);
WARNING;
}
if (op2->offset == -1) {
into_stack(op2);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, op1->offset);
_2AC_OFF("lw", _T1, _FP, op2->offset);
_BRANCH("bge", _T0, _T1, label->u.no);
break;
}
case LE: {
Operand op1 = ic->u.binop.op1;
Operand op2 = ic->u.binop.op2;
Operand label = ic->u.binop.op3;
if (op1->offset == -1) {
into_stack(op1);
WARNING;
}
if (op2->offset == -1) {
into_stack(op2);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, op1->offset);
_2AC_OFF("lw", _T1, _FP, op2->offset);
_BRANCH("blt", _T0, _T1, label->u.no);
break;
}
case LEQ: {
Operand op1 = ic->u.binop.op1;
Operand op2 = ic->u.binop.op2;
Operand label = ic->u.binop.op3;
if (op1->offset == -1) {
into_stack(op1);
WARNING;
}
if (op2->offset == -1) {
into_stack(op2);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, op1->offset);
_2AC_OFF("lw", _T1, _FP, op2->offset);
_BRANCH("ble", _T0, _T1, label->u.no);
break;
}
case NEQ: {
Operand op1 = ic->u.binop.op1;
Operand op2 = ic->u.binop.op2;
Operand label = ic->u.binop.op3;
if (op1->offset == -1) {
into_stack(op1);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, op1->offset);
if (op2->kind == CONSTANT) {
_BRANCH("bne", _T0, _ZERO, label->u.no);
} else {
if (op2->offset == -1) {
into_stack(op2);
WARNING;
}
_2AC_OFF("lw", _T1, _FP, op2->offset);
_BRANCH("bne", _T0, _T1, label->u.no);
}
break;
}
case EQ: {
Operand op1 = ic->u.binop.op1;
Operand op2 = ic->u.binop.op2;
Operand label = ic->u.binop.op3;
if (op1->offset == -1) {
into_stack(op1);
WARNING;
}
if (op2->offset == -1) {
into_stack(op2);
WARNING;
}
_2AC_OFF("lw", _T0, _FP, op1->offset);
_2AC_OFF("lw", _T1, _FP, op2->offset);
_BRANCH("beq", _T0, _T1, label->u.no);
break;
}
case RETURN: {
Operand op = ic->u.unop.op1;
if (op->offset == -1) {
into_stack(op);
WARNING;
}
_2AC_OFF("lw", _V0, _FP, op->offset);
_2AC("move", _SP, _FP);
_2AC("lw", _RA, "-4($sp)");
_2AC("lw", _FP, "-8($sp)");
_1AC("jr", _RA);
fprintf(f, "\n");
break;
}
case DEC: {
Operand left = ic->u.assign.left;
Operand right = ic->u.assign.right;
_3AC_INT("addi", _SP, _SP, -right->u.no);
stack_size += right->u.no;
left->offset = -(stack_size);
break;
}
case ARG: {
Operand op = ic->u.unop.op1;
if (arg_cnt == 0) {
_3AC_INT("addi", _SP, _FP, -stack_size);
}
arg_cnt += 1;
if (op->offset == -1) {
into_stack(op);
WARNING;
} else {
_2AC_OFF("lw", _T0, _FP, op->offset);
_3AC("addi", _SP, _SP, "-4");
_2AC_OFF("sw", _T0, _SP, 0);
stack_size += 4;
}
break;
}
case PARAM: {
Operand op = ic->u.unop.op1;
op->offset = param_cnt * 4;
param_cnt += 1;
break;
}
case READ: {
Operand op = ic->u.unop.op1;
_JAL("read");
if (op->offset == -1) {
into_stack(op);
}
_2AC_OFF("sw", _V0, _FP, op->offset);
break;
}
case CALL: {
arg_cnt = 0;
Operand left = ic->u.call.left;
_JAL(ic->u.call.name);
if (left->offset == -1) {
into_stack(left);
}
_2AC_OFF("sw", _V0, _FP, left->offset);
break;
}
case WRITE: {
Operand op = ic->u.unop.op1;
if (op->offset == -1) {
into_stack(op);
WARNING;
}
_2AC_OFF("lw", _A0, _FP, op->offset);
_JAL("write");
break;
}
}
}
fclose(f);
}