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Copy pathmipscode.cpp
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191 lines (188 loc) · 3.65 KB
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ofstream mcode("mipsinter.s");
ofstream f("mips.s");
string def = "";
int tempco = 0;
map<string,int> vars;
vector<pair<string,string> > lit_strings;
void genmips(string label,string op=def,string a1=def,string a2=def,string ret=def)
{
if(label != "")
{
mcode << label << ":" << endl;
}
else if(op == "exit")
{
mcode << "jr $ra" << endl;
}
else if(op == "goto")
{
mcode << "j " << a1 << endl;
}
else if(op == "pushreturn")
{
mcode << "addi $sp,$sp,-4" << endl;
mcode << "sw $ra,0($sp)" << endl;
}
else if(op == "popreturn")
{
mcode << "lw $ra,0($sp)" << endl;
mcode << "addi $sp,$sp,4" << endl;
}
else if(op == "call")
{
mcode << "jal " << a1 << endl;
}
else if(op == "puts")
{
mcode << "li $v0, 4" << endl;
mcode << "la $a0, " << a1 << endl;
mcode << "syscall" << endl;
}
else
{
if(a1 != def)
{
if(a1[0] <= '9' and a1[0] >= '0')
mcode << "li $t1, " << a1 << endl;
else
{
a1 = "_"+a1;
mcode << "lw $t1, " << a1 << endl;
if(vars.find(a1) == vars.end())
vars[a1] = 1;
}
}
if(a2 != def)
{
if(a2[0] <= '9' and a2[0] >= '0')
mcode << "li $t2, " << a2 << endl;
else
{
a2 = "_"+a2;
mcode << "lw $t2, " << a2 << endl;
if(vars.find(a2) == vars.end())
vars[a2] = 1;
}
}
if(op == "restorereturn")
{
mcode << "sw $v0, " << a1 << endl;
}
if(op == "copy")
{
mcode << "lw $t8, " << a1 << endl;
mcode << "sw $t8, " << a2 << endl;
}
if(op == "push")
{
mcode << "addi $sp,$sp,-4" << endl;
mcode << "lw $t8, " << a1 << endl;
mcode << "sw $t8,0($sp)" << endl;
}
if(op == "pop")
{
mcode << "lw $t8,0($sp)" << endl;
mcode << "sw $t8, " << a1 << endl;
mcode << "addi $sp,$sp,4" << endl;
}
if(op == "if")
{
mcode << "bgtz $t1, " << ret << endl;
return;
}
if(op == "return")
{
mcode << "move $v0, $t1" << endl;
}
if(op == "read")
{
mcode << "li $v0, 5" << endl;
mcode << "syscall" << endl;
mcode << "sw $v0, " << a1 << endl;
}
if(op == "write")
{
mcode << "li $v0, 1" << endl;
mcode << "move $a0, $t1" << endl;
mcode << "syscall" << endl;
}
if(op == "&&")
{
mcode << "and $t0,$t1,$t2" << endl;
}
if(op == "||")
{
mcode << "or $t0,$t1,$t2" << endl;
}
if(op == "+")
{
mcode << "add $t0,$t1,$t2" << endl;
}
if(op == "-")
{
mcode << "sub $t0,$t1,$t2" << endl;
}
if(op == "*")
{
mcode << "mult $t1,$t2" << endl;
mcode << "mflo $t0" << endl;
}
if(op == "/")
{
mcode << "div $t1,$t2" << endl;
mcode << "mflo $t0" << endl;
}
if(op == ">=")
{
mcode << "slt $t3,$t1,$t2" << endl;
mcode << "xori $t0,$t3,1" << endl;
}
if(op == "<=")
{
mcode << "slt $t3,$t2,$t1" << endl;
mcode << "xori $t0,$t3,1" << endl;
}
if(op == ">")
{
mcode << "slt $t0,$t2,$t1" << endl;
}
if(op == "<")
{
mcode << "slt $t0,$t1,$t2" << endl;
}
if(op == "==")
{
mcode << "slt $t3,$t1,$t2" << endl;
mcode << "slt $t4,$t2,$t1" << endl;
mcode << "or $t5,$t3,$t4" << endl;
mcode << "xori $t0,$t5,1" << endl;
}
if(op == "!=")
{
mcode << "slt $t3,$t1,$t2" << endl;
mcode << "slt $t4,$t2,$t1" << endl;
mcode << "or $t0,$t3,$t4" << endl;
}
if(ret != def)
{
ret = "_"+ret;
mcode << "sw $t0, " << ret << endl;
if(vars.find(ret) == vars.end())
vars[ret] = 1;
}
}
}
void data()
{
string s;
f << ".data" << endl;
for(int i=0;i<lit_strings.size();i++)
{
f << lit_strings[i].first << ": .asciiz " << lit_strings[i].second << endl;
}
for(map<string,int> :: iterator i = vars.begin(); i != vars.end();i++)
f << i->first << ": .word 0" << endl;
ifstream fin("mipsinter.s");
while(getline(fin,s))
f << s << endl;
}