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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);
if (type == UnaryOperatorType.NEG) {
code.append("# Negation\n");
if (result.getAddress() != null) {
String reg = regAllocator.getRegisterOrLoadIntoRegister(result, code);
code.append(String.format("sub %s, $zero, %s\n", reg, reg))
.append(String.format("sw %s 0(%s)\n", reg, result.getAddress()));
regAllocator.clear(reg);
} else {
code.append(String.format("sub %s, $zero, %s\n", result.getRegister(),
result.getRegister()));
}
}
return result;
}
}
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