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/*
* Code formatter project
* CS 4481
*/
package submit.ast;
import submit.MIPSResult;
import submit.RegisterAllocator;
import submit.SymbolTable;
/**
*
* @author edwajohn
*/
public class UnaryOperator extends AbstractNode implements Expression {
private final UnaryOperatorType type;
private final Expression expression;
public UnaryOperator(String type, Expression expression) {
this.type = UnaryOperatorType.fromString(type);
this.expression = expression;
}
@Override
public void toCminus(StringBuilder builder, String prefix) {
builder.append(type);
expression.toCminus(builder, prefix);
}
@Override
public MIPSResult toMIPS(StringBuilder code, StringBuilder data,
SymbolTable symbolTable,
RegisterAllocator regAllocator) {
MIPSResult result =
expression.toMIPS(code, data, symbolTable, regAllocator);
String reg = regAllocator.getRegisterOrLoadIntoRegister(result, code);
switch (type) {
case NEG:
code.append(String.format("sub %s $zero %s\n", reg, reg));
break;
case NOT:
code.append(String.format("sltu %s $zero %s\n", reg, reg))
.append(String.format("xori %s %s 1\n", reg, reg));
break;
default:
break;
}
return MIPSResult.createRegisterResult(reg, VarType.INT);
}
}
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