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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 Assignment extends AbstractNode implements Expression {
private final Mutable mutable;
private final AssignmentType type;
private final Expression rhs;
public Assignment(Mutable mutable, String assign, Expression rhs) {
this.mutable = mutable;
this.type = AssignmentType.fromString(assign);
this.rhs = rhs;
}
public void toCminus(StringBuilder builder, final String prefix) {
mutable.toCminus(builder, prefix);
if (rhs != null) {
builder.append(" ").append(type.toString()).append(" ");
rhs.toCminus(builder, prefix);
} else {
builder.append(type.toString());
}
}
public MIPSResult toMIPS(StringBuilder code, StringBuilder data,
SymbolTable symbolTable,
RegisterAllocator regAllocator) {
MIPSResult mut = mutable.toMIPS(code, data, symbolTable, regAllocator);
MIPSResult result = rhs.toMIPS(code, data, symbolTable, regAllocator);
String registerWithAddressOfMutable = mut.getAddress();
if (result.getRegister() != null) {
code.append(String.format("sw %s 0(%s)\n", result.getRegister(),
registerWithAddressOfMutable));
regAllocator.clear(result.getRegister());
} else if (result.getAddress() != null) {
regAllocator.loadIntoRegister(result, code, result.getAddress());
regAllocator.clear(result.getAddress());
}
regAllocator.clear(registerWithAddressOfMutable);
return MIPSResult.createVoidResult();
}
}
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