content: /**
   * 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.ast.intermediate.CompleteLine;
  import org.jreversepro.reflect.instruction.Instruction;
  
  
  /**
   *  @(#) PopEvaluator.java
   *
   * JReversePro - Java Decompiler / Disassembler.
   * Copyright (C) 2008 Karthik Kumar.
   * EMail: akkumar@users.sourceforge.net
   *
   * This program is free software; you can redistribute it and/or modify
   * it , under the terms of the GNU General Public License as published
   * by the Free Software Foundation; either version 2 of the License,
   * or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   * See the GNU General Public License for more details.
   * You should have received a copy of the GNU General Public License
   * along with this program.If not, write to
   *  The Free Software Foundation, Inc.,
   *  59 Temple Place - Suite 330,
   *  Boston, MA 02111-1307, USA.
   **/
  
  /**
   * @author akkumar
   * 
   */
  public class PopEvaluator extends AbstractInstructionEvaluator {
  
    /**
     * @param context
     */
    public PopEvaluator(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) {
      if (ins.opcode == OPCODE_POP) {
        Expression op1 = evalMachine.pop();
        statements.append(new CompleteLine(ins, op1));
      } else if (ins.opcode == OPCODE_POP2) {
        // To Assess its use properly.
        Expression op1 = evalMachine.pop();
        if (op1.isCategory1()) {
          evalMachine.pop();
        }
      } else {
        throw new UnsupportedOperationException("Unsupported opcode");
      }
  
    }
  
    /*
     * (non-Javadoc) 
     * 
     * @seenet.sf.jrevpro.decompile.evaluator.AbstractInstructionEvaluator#
     * getProcessingOpcodes()
     */
    @Override
    Iterable<Integer> getProcessingOpcodes() {
      return Arrays.asList(OPCODE_POP, OPCODE_POP2);
    }
  
  }
  