/*
Function: gen3AC()
Description:
*/
threeAC multExpr_Node::gen3AC(){
//std::cout << "Generate 3AC for postfix expression node" << std::endl;
if (exprA != NULL && exprB == NULL) {
return exprA->gen3AC();
}
threeAC tempA = exprA->gen3AC();
threeAC tempB = exprB->gen3AC();
std::string reg = "";
switch(type) {
case MULT:
reg = intTC();
//out3AC << ("MULT " + reg + " " + tempA.str + " " + tempB.str) << std::endl;
output3AC("MULT", reg, tempA.str, tempB.str);
break;
case DIV:
reg = intTC();
//out3AC << ("DIV " + reg + " " + tempA.str + " " + tempB.str) << std::endl;
output3AC("DIV", reg, tempA.str, tempB.str);
break;
default:
reg = "";
break;
}
tempA.str = reg;
return tempA;
}
/*
Function: gen3AC()
Description:
*/
threeAC assignmentExpr_Node::gen3AC(){
//std::cout << "Generate 3AC for assignment expression node" << std::endl;
if (exprA != NULL && exprB == NULL) {
return exprA->gen3AC();
}
threeAC tempA = exprA->gen3AC();
threeAC tempB = exprB->gen3AC();
std::string reg = "";
switch(type) {
case ASSIGN:
//out3AC << ("ASSIGN " + tempA.str + " " + tempB.str) << std::endl;
output3AC("ASSIGN", tempA.str, tempB.str, "-");
break;
case MUL_ASSIGN:
reg = intTC();
//out3AC << ("MUL " + reg + " " + tempA.str + " " + tempB.str) << std::endl;
//out3AC << ("ASSIGN " + tempA.str + " " + reg) << std::endl;
output3AC("MUL", reg, tempA.str, tempB.str);
output3AC("ASSIGN", tempA.str, reg, "-");
break;
case DIV_ASSIGN:
reg = intTC();
//out3AC << ("DIV " + reg + " " + tempA.str + " " + tempB.str) << std::endl;
//out3AC << ("ASSIGN " + tempA.str + " " + reg) << std::endl;
output3AC("DIV", reg, tempA.str, tempB.str);
output3AC("ASSIGN", tempA.str, reg, "-");
break;
case ADD_ASSIGN:
reg = intTC();
//out3AC << ("ADD " + reg + " " + tempA.str + " " + tempB.str) << std::endl;
//out3AC << ("ASSIGN " + tempA.str + " " + reg) << std::endl;
output3AC("ADD", reg, tempA.str, tempB.str);
output3AC("ASSIGN", tempA.str, reg, "-");
break;
case SUB_ASSIGN:
reg = intTC();
//out3AC << ("SUB " + reg + " " + tempA.str + " " + tempB.str) << std::endl;
//out3AC << ("ASSIGN " + tempA.str + " " + reg) << std::endl;
output3AC("SUB", reg, tempA.str, tempB.str);
output3AC("ASSIGN", tempA.str, reg, "-");
break;
default:
reg = "";
break;
}
return tempA;
}
/*
Function: gen3AC()
Description:
*/
threeAC unaryExpr_Node::gen3AC(){
//std::cout << "Generate 3AC for unary expression node" << std::endl;
std::string reg = "";
threeAC temp;
if (exprA != NULL && exprB == NULL && !incOp && !decOp) {
return exprA->gen3AC();
}
// if ++
else if (incOp) {
temp = exprB->gen3AC();
reg = intTC();
//out3AC << ("ADD " + reg + " " + temp.str + " 1") << std::endl;
//out3AC << ("ASSIGN " + temp.str + " " + reg) << std::endl;
output3AC("ADD", reg, temp.str, "1");
output3AC("ASSIGN", temp.str, reg, "-");
}
// if --
else if (decOp) {
temp = exprB->gen3AC();
reg = intTC();
//out3AC << ("SUB " + reg + " " + temp.str + " 1") << std::endl;
//out3AC << ("ASSIGN " + temp.str + " " + reg) << std::endl;
output3AC("SUB", reg, temp.str, "1");
output3AC("ASSIGN", temp.str, reg, "-");
}
// if -
else if ( (exprB != NULL) && (dynamic_cast <unaryOp_Node*> (exprA))) {
reg = intTC();
//out3AC << ("MULT " + reg + " " + exprB->gen3AC().str + " -1") << std::endl;
output3AC("MULT", reg, exprB->gen3AC().str, "-1");
}
temp.str = reg;
return temp;
}
/*
Function: gen3AC()
Description:
*/
threeAC postfixExpr_Node::gen3AC(){
threeAC temp;
std::string reg = "";
// check for simple case
if (exprA != NULL && exprB == NULL && !incOp && !decOp) {
return exprA->gen3AC();
}
temp = exprA->gen3AC();
if (temp.ste.isArray()) {
threeAC tempB = exprB->gen3AC();
// 2D array
std::vector<int> arrDims = temp.ste.getArrayDimensions();
if (arrDims.size() == 3) {
std::string t1 = intTC();
std::string t2 = intTC();
std::string offset = intTC();
//out3AC << ("MUL " + t1 + " " + tempB.str + " 4") << std::endl;
//out3AC << ("MUL " + t2 + " " + t1 + " " + std::to_string(arrDims[1])) << std::endl;
//out3AC << ("ADD " + offset + " " + temp.str + " " + t2) << std::endl;
output3AC("MULT", t1, tempB.str, "4");
output3AC("MULT", t2, t1, std::to_string(arrDims[2]));
output3AC("ADD", offset, temp.str, t2);
reg = offset;
// decrement dimension count
arrDims.pop_back();
temp.ste.setArrayDimensions(arrDims);
}
else if (arrDims.size() == 2) {
std::string t1 = intTC();
std::string t2 = intTC();
std::string offset = intTC();
//out3AC << ("MUL " + t1 + " " + tempB.str + " 4") << std::endl;
//out3AC << ("MUL " + t2 + " " + t1 + " " + std::to_string(arrDims[1])) << std::endl;
//out3AC << ("ADD " + offset + " " + temp.str + " " + t2) << std::endl;
output3AC("MULT", t1, tempB.str, "4");
output3AC("MULT", t2, t1, std::to_string(arrDims[1]));
output3AC("ADD", offset, temp.str, t2);
reg = offset;
// decrement dimension count
arrDims[0] = arrDims[1];
arrDims.pop_back();
temp.ste.setArrayDimensions(arrDims);
}
// 1D array
else if (arrDims.size() == 1) {
std::string t1 = intTC();
std::string t2 = intTC();
//out3AC << ("MUL " + t1 + " " + tempB.str + " 4") << std::endl;
//out3AC << ("ADD " + t2 + " " + temp.str + " " + t1) << std::endl;
output3AC("MULT", t1, tempB.str, "4");
output3AC("ADD", t2, temp.str, t1);
reg = t2;
}
}
// check for increment
if (incOp) {
reg = intTC();
temp = exprA->gen3AC();
//out3AC << ("ADD " + reg + " " + temp.str + " 1") << std::endl;
//out3AC << ("ASSIGN " + temp.str + " " + reg) << std::endl;
output3AC("ADD", reg, temp.str, "1");
output3AC("ASSIGN", temp.str, reg, "-");
}
// check for decrement
else if (decOp) {
reg = intTC();
temp = exprA->gen3AC();
//out3AC << ("SUB " + reg + " " + temp.str + " 1") << std::endl;
//out3AC << ("ASSIGN " + temp.str + " " + reg) << std::endl;
output3AC("SUB", reg, temp.str, "1");
output3AC("ASSIGN", temp.str, reg, "-");
}
temp.str = reg;
return temp;
}