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asmGenerator.cpp
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asmGenerator.cpp
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#include <iostream>
#include <string>
#include <sstream>
using namespace std;
string init_var(int taroffset) {
stringstream asscode;
asscode << "\txor %rax, %rax" << endl; //clear reg
asscode << "\tmovq %rax,-"<<taroffset<<"(%rbp)"<<endl; //alloc var count offset from base pointer
return asscode.str();
}
string init_string(char* ch,int i) {
stringstream asscode;
asscode << "\t.s"<<i<<": .string "<<ch<< endl;
return asscode.str();
}
string assign(int opOffset,int taroffset){
stringstream asscode;
//if op == '' means $a = add, sub, mul, div, mod, const
if(opOffset == -1){
asscode << "\tpop %rax"<< endl;
asscode << "\tmovq %rax,-"<<taroffset<<"(%rbp)"<<endl;
}
//if go else means $a = var (op is var address )
else{
asscode << "\tmovq -"<<opOffset<<"(%rbp),-"<<taroffset<<"(%rbp)"<<endl;
}
return asscode.str();
}
string constn(int val){
stringstream asscode;
asscode << "\tmovq $"<< val <<",%rax"<<endl; //copy cont to rax
asscode << "\tpush %rax"<< endl; //push rax into stack
return asscode.str();
}
string add(int operandleft,int operandright){
stringstream asscode;
//no operand passed means get it from stack
if(operandright == -1){
asscode << "\tpop %rbx"<< endl;
}
else{
asscode << "\tmovq -"<< operandright <<"(%rbp), %rbx" << endl;
}
if(operandleft == -1){
asscode << "\tpop %rax"<< endl;
}
else{
asscode << "\tmovq -"<<operandleft<<"(%rbp), %rax"<<endl;
}
asscode << "\tadd %rbx, %rax"<< endl; // %rax = %rax + %rbx
asscode << "\tpush %rax"<< endl;
return asscode.str();
}
string sub(int operandleft,int operandright){
stringstream asscode;
//no operand passed means get it from stack
if(operandright == -1){
asscode << "\tpop %rbx"<< endl;
}
else{
asscode << "\tmovq -"<< operandright <<"(%rbp), %rbx" << endl;
}
if(operandleft == -1){
asscode << "\tpop %rax"<< endl;
}
else{
asscode << "\tmovq -"<<operandleft<<"(%rbp), %rax"<<endl;
}
asscode << "\tsub %rbx, %rax"<< endl; // %rax = %rax - %rbx
asscode << "\tpush %rax"<< endl;
return asscode.str();
}
string mul(int operandleft,int operandright){
stringstream asscode;
//no operand passed means get it from stack
if(operandright == -1){
asscode << "\tpop %rbx"<< endl;
}
else{
asscode << "\tmovq -"<< operandright <<"(%rbp), %rbx" << endl;
}
if(operandleft == -1){
asscode << "\tpop %rax"<< endl;
}
else{
asscode << "\tmovq -"<<operandleft<<"(%rbp), %rax"<<endl;
}
asscode << "\timul %rbx"<< endl; //%rax = %rax x %rbx ; imul is signed
asscode << "\tpush %rax"<< endl;
return asscode.str();
}
string divide(int operandleft,int operandright){
stringstream asscode;
//no operand passed means get it from stack
if(operandright == -1){
asscode << "\tpop %rbx"<< endl;
}
else{
asscode << "\tmovq -"<< operandright <<"(%rbp), %rbx" << endl;
}
if(operandleft == -1){
asscode << "\tpop %rax"<< endl;
}
else{
asscode << "\tmovq -"<<operandleft<<"(%rbp), %rax"<<endl;
}
asscode << "\tidiv %rbx"<< endl; //%rax = %rax / %rbx ; idiv is signed
asscode << "\tpush %rax"<< endl;
return asscode.str();
}
string mod(int operandleft,int operandright){
stringstream asscode;
//no operand passed means get it from stack
if(operandright == -1){
asscode << "\tpop %rbx"<< endl;
}
else{
asscode << "\tmovq -"<< operandright <<"(%rbp), %rbx" << endl;
}
if(operandleft == -1){
asscode << "\tpop %rax"<< endl;
}
else{
asscode << "\tmovq -"<<operandleft<<"(%rbp), %rax"<<endl;
}
asscode << "\txor %rdx, %rdx"<< endl;
asscode << "\tidiv %rbx"<< endl; //%rax = %rax / %rbx
asscode << "\tpush %rdx"<< endl; //%rdx = %rax % %rbx
return asscode.str();
}
string asif(int icount){
stringstream asscode;
asscode << "IF"<< icount <<" :"<<endl;
return asscode.str();
}
string asloophead(int var,int lcount){
stringstream asscode;
asscode << "\tpop %rcx"<< endl;
asscode << "\tpop %rax"<< endl;
asscode << "LOOP"<<lcount<<" :"<<endl;
asscode << "\tcmp %rax,%rcx"<< endl;
asscode << "\tjg LE"<<lcount<<endl;
asscode <<"\tdec %rax"<<endl;
asscode << "\tmovq %rax,-"<<var<<"(%rbp)"<<endl;
return asscode.str();
}
string loopend(int lcount){
stringstream asscode;
asscode <<"\tjmp LOOP"<<lcount<<" "<<endl;
asscode << "LE"<<lcount<<" :"<<endl;
return asscode.str();
}
string condition(int operandleft,int operandright,int icount){
stringstream asscode;
if(operandright == -1){
asscode << "\tpop %rbx"<< endl;
}
else{
asscode << "\tmovq -"<< operandright <<"(%rbp), %rbx" << endl;
}
if(operandleft == -1){
asscode << "\tpop %rax"<< endl;
}
else{
asscode << "\tmovq -"<<operandleft<<"(%rbp), %rax"<<endl;
}
asscode << "\tcmp %rax,%rbx"<< endl;
asscode << "\tjnz IF"<<icount<<endl;
return asscode.str();
}
string show(int opOffset){
stringstream asscode;
// put string to print
asscode << "\tleaq .show, %rdi"<< endl;
// put format
if(opOffset == -1){
asscode << "\tpop %rsi"<< endl;
}
else{
asscode << "\tmovq -"<<opOffset<<"(%rbp),%rsi"<<endl;
}
// set rax = 0
asscode << "\txor %rax, %rax"<< endl;
// call printf
asscode << "\tcall printf"<< endl;
return asscode.str();
}
string showString(int i){
stringstream asscode;
// put string to print
asscode << "\tleaq .showstring, %rdi"<< endl;
// put format
asscode << "\tleaq .s"<<i<<", %rsi"<< endl;
// set rax = 0
asscode << "\txor %rax, %rax"<< endl;
// call printf
asscode << "\tcall printf"<< endl;
return asscode.str();
}
string head(){
stringstream asscode;
asscode << ".global main"<< endl;
asscode << ".text"<< endl;
asscode << "main:\n\tmovq %rsp,%rbp"<< endl;
asscode << "\tsub $216,%rsp"<< endl;
return asscode.str();
}
string foot(){
stringstream asscode;
asscode << "\tadd $216, %rsp"<< endl;
asscode << "\tret"<< endl;
asscode << ".data\n\t.show: .string \" %d \\n\" "<< endl;
asscode << "\t.showstring: .string \" %s \\n\" "<< endl;
return asscode.str();
}