/**
* @(#) DupEvaluator.java
* JReversePro - Java Decompiler / Disassembler.
* Copyright (C) 2008 Karthik Kumar.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**/
package org.jreversepro.ast.evaluator;
import java.util.Arrays;
import org.jreversepro.ast.expression.Expression;
import org.jreversepro.reflect.instruction.Instruction;
/**
* @author akkumar
*
*/
public class DupEvaluator extends AbstractInstructionEvaluator {
/**
* @param context
*/
public DupEvaluator(EvaluatorContext context) {
super(context);
}
/*
* (non-Javadoc)
*
* @see
* net.sf.jrevpro.decompile.evaluator.AbstractInstructionEvaluator#evaluate
* (net.sf.jrevpro.reflect.instruction.Instruction)
*/
@Override
void evaluate(Instruction ins) {
try {
switch (ins.opcode) {
case OPCODE_DUP: { // dup
evalMachine.push(evalMachine.peek());
break;
}
case OPCODE_DUP_X1: { // dup_x1
Expression op1 = evalMachine.pop();
Expression op2 = evalMachine.pop();
evalMachine.push(op1);
evalMachine.push(op2);
evalMachine.push((Expression) op1.clone());
break;
}
case OPCODE_DUP_X2: { // dup_x2
Expression op1 = evalMachine.pop();
Expression op2 = evalMachine.pop();
if (op2.isCategory1()) {
// Cat.1
Expression op3 = evalMachine.pop();
evalMachine.push((Expression) op1.clone());
evalMachine.push(op3);
} else {
// Cat.2
evalMachine.push((Expression) op1.clone());
}
evalMachine.push(op2);
evalMachine.push(op1);
break;
}
case OPCODE_DUP2: { // dup2
Expression op1 = evalMachine.pop();
if (op1.isCategory1()) {
// Cat.1
Expression op2 = evalMachine.pop();
evalMachine.push(op2);
evalMachine.push(op1);
evalMachine.push((Expression) op2.clone());
} else {
// Cat.2
evalMachine.push(op1);
}
evalMachine.push(op1);
break;
}
case OPCODE_DUP2_X1: { // dup2_x1
Expression op1 = evalMachine.pop();
Expression op2 = evalMachine.pop();
if (op1.isCategory1()) {
// Cat.1
Expression op3 = evalMachine.pop();
evalMachine.push(op2);
evalMachine.push(op1);
evalMachine.push(op3);
evalMachine.push((Expression) op2.clone());
} else {
// Cat.2
evalMachine.push(op1);
evalMachine.push(op2);
}
evalMachine.push((Expression) op1.clone());
break;
}
case OPCODE_DUP2_X2: { // dup2_x2
Expression op1 = evalMachine.pop();
Expression op2 = evalMachine.pop();
if (op1.isCategory1()) {
// value1-Cat1
Expression op3 = evalMachine.pop();
if (op2.isCategory1()) {
// value2-Cat1
Expression op4 = evalMachine.pop();
evalMachine.push(op2);
evalMachine.push(op1);
evalMachine.push(op4);
// Form 1.
} else {
// value2-Cat2
evalMachine.push(op2);
evalMachine.push(op1);
// Form. 3
}
evalMachine.push(op3);
} else {
// value1-Cat2
if (op2.isCategory1()) {
// value2-Cat1
Expression op3 = evalMachine.pop();
evalMachine.push(op1);
evalMachine.push(op3);
// Form. 2
} else {
// value2-Cat2
evalMachine.push(op1);
// Form 4.
}
}
evalMachine.push(op2);
evalMachine.push(op1);
break;
}
case OPCODE_SWAP: { // swap
Expression op1 = evalMachine.pop();
Expression op2 = evalMachine.pop();
evalMachine.push(op1);
evalMachine.push(op2);
break;
}
}
} catch (CloneNotSupportedException cex) {
throw new UnsupportedOperationException("Clone not supported", cex);
}
}
/*
* (non-Javadoc)
*
* @seenet.sf.jrevpro.decompile.evaluator.AbstractInstructionEvaluator#
* getProcessingOpcodes()
*/
@Override
Iterable<Integer> getProcessingOpcodes() {
return Arrays.asList(OPCODE_DUP, OPCODE_DUP_X1, OPCODE_DUP_X2, OPCODE_DUP2,
OPCODE_DUP2_X1, OPCODE_DUP2_X2, OPCODE_SWAP);
}
}