public string Visit(CIL_StrConcat node)
{
var code_result = "";
var string1_len = context_function[node.StrId];
var string2_len = context_function[node.StrId2];
//allocate the space in node.result
code_result += $"\t lw $t0 {string1_len}\n";
code_result += $"\t lw $t0 0($t0)\n";
code_result += $"\t li $a0 0\n";
code_result += $"\t lw $t1 {string2_len}\n";
code_result += $"\t lw $t1 0($t1)\n";
code_result += $"\t add $a0 $t0 $t1\n";
code_result += $"\t addi $a0 $a0 -8\n";
code_result += $"\t li $v0 9\n";
code_result += $"\t syscall\n"; // allocate
code_result += $"\t sw $v0 {context_function[node.Result]}\n";
//guarda la direccion de la memoria allocada
code_result += $"\t la $t2 String\n";
code_result += $"\t sw $a0 0($v0)\n"; // save len
code_result += $"\t sw $t2 4($v0)\n"; // save type
code_result += $"\t lw $t0 {string1_len}\n";
code_result += $"\t lw $t1 {string2_len}\n";
code_result += $"\t lw $t2 0($t0)\n";
code_result += $"\t addi $t2 $t2 -8\n";
code_result += $"\t lw $t4 0($t1)\n";
code_result += $"\t addi $t4 $t4 -8\n";
code_result += $"\t addi $t0 $t0 8\n";
code_result += $"\t addi $t1 $t1 8\n";
code_result += $"\t addi $v0 $v0 8\n";
// en V0 = newstr, T0 = str1, T1 = str2, t2 = len(str1);
code_result += $"\t .concat1: \n";
code_result += $"\t beq $t2 $zero .endconcat1\n";
code_result += $"\t lb $t3 0($t0)\n";
code_result += $"\t sb $t3 0($v0)\n";
code_result += $"\t addi $t2, $t2, -1\n";
code_result += $"\t addi $t0, 1\n";
code_result += $"\t addi $v0, 1\n";
code_result += $"\t j .concat1\n";
code_result += $"\t .endconcat1: \n";
code_result += $"\t move $t2 $t4\n";
code_result += $"\t .concat2: \n";
code_result += $"\t beq $t2 $zero .endconcat2\n";
code_result += $"\t lb $t3 0($t1)\n";
code_result += $"\t sb $t3 0($v0)\n";
code_result += $"\t addi $t2, $t2, -1\n";
code_result += $"\t addi $t1, 1\n";
code_result += $"\t addi $v0, 1\n";
code_result += $"\t j .concat2\n";
code_result += $"\t .endconcat2: \n";
return(code_result);
}
public string Visit(CIL_StrConcat node)
{
throw new NotImplementedException();
}
