/**
* @(#) ConditionUniOperatorEvaluator.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.ConditionExpression;
import org.jreversepro.ast.expression.Constant;
import org.jreversepro.ast.expression.Expression;
import org.jreversepro.ast.expression.ConditionExpression.RelationalOperator;
import org.jreversepro.jls.JLSConstants;
import org.jreversepro.reflect.instruction.Instruction;
/**
* @author akkumar
*
*/
public class ConditionUniOperatorEvaluator extends AbstractInstructionEvaluator {
/**
* @param context
*/
public ConditionUniOperatorEvaluator(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) {
Expression lhs = evalMachine.pop();
RelationalOperator op = RelationalOperator.EQ;
switch (ins.opcode) {
case OPCODE_IFEQ:
op = RelationalOperator.EQ;
break;
case OPCODE_IFNE:
op = RelationalOperator.NE;
break;
case OPCODE_IFLT:
op = RelationalOperator.LT;
break;
case OPCODE_IFLE:
op = RelationalOperator.LE;
break;
case OPCODE_IFGE:
op = RelationalOperator.GE;
break;
case OPCODE_IFGT:
op = RelationalOperator.GT;
break;
}
if (evalMachine.prevOpcode < OPCODE_LCMP
|| evalMachine.prevOpcode > OPCODE_DCMPG) {
// To be compared with 0
evalMachine.conditionExpression = null;
Expression rhs = new Constant(JLSConstants.VALUE_0, lhs.getType());
evalMachine.conditionExpression = new ConditionExpression(lhs, rhs, op);
}
}
/*
* (non-Javadoc)
*
* @seenet.sf.jrevpro.decompile.evaluator.AbstractInstructionEvaluator#
* getProcessingOpcodes()
*/
@Override
Iterable<Integer> getProcessingOpcodes() {
return Arrays.asList(OPCODE_IFEQ, OPCODE_IFNE, OPCODE_IFLT, OPCODE_IFLE,
OPCODE_IFGT, OPCODE_IFGE);
}
}