Package bytecodeparser.analysis.decoders

Source Code of bytecodeparser.analysis.decoders.DecodedArrayCreationOp

/*
*  Copyright (C) 2011 Stephane Godbillon
*  This file is part of BytecodeParser. See the README file in the root
*  directory of this project.
*
*  BytecodeParser is free software: you can redistribute it and/or modify
*  it under the terms of the GNU Lesser General Public License as published by
*  the Free Software Foundation, either version 3 of the License, or
*  (at your option) any later version.

*  BytecodeParser 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 Lesser General Public License for more details.

*  You should have received a copy of the GNU Lesser General Public License
*  along with BytecodeParser.  If not, see <http://www.gnu.org/licenses/>.
*/
package bytecodeparser.analysis.decoders;

import javassist.bytecode.Opcode;
import bytecodeparser.Context;
import bytecodeparser.analysis.opcodes.ArrayCreationOpcode;
import bytecodeparser.analysis.stack.Array;
import bytecodeparser.analysis.stack.Constant.IntegerConstant;
import bytecodeparser.analysis.stack.Stack;
import bytecodeparser.analysis.stack.StackElement;
import bytecodeparser.analysis.stack.TrackableArray;
import bytecodeparser.utils.Utils;

/**
* A decoded array creation op.
* @author Stephane Godbillon
*
*/
public class DecodedArrayCreationOp extends DecodedBasicOp {
  /**
   * The number of dimensions of the created array.
   */
  public final int dimensions;
  /**
   * The signature of the created array.
   */
  public final String signature;
 
  public DecodedArrayCreationOp(ArrayCreationOpcode op, Context context, int index) {
    super(op, context, index);
    if(op.getCode() == Opcode.MULTIANEWARRAY)
      dimensions = parameterValues[1];
    else dimensions = 1;
    if(op.getCode() == Opcode.NEWARRAY)
      signature = getSignatureForSingleDimensionArrayOfPrimitive(parameterValues[0]);
    else signature = Utils.getConstPool(context.behavior).getClassInfo(parameterValues[0]);
  }
 
  @Override
  public void simulate(Stack stack) {
    int size = -1;
    if(dimensions == 1) {
      StackElement se = stack.pop();
      if(se instanceof IntegerConstant) {
        IntegerConstant ic = (IntegerConstant) se;
        size = ic.getValue();
      }
    } else {
      for(int i = 0; i < dimensions; i++)
        stack.pop();
    }
    if(size > -1)
      stack.push(new TrackableArray(signature, size));
    else stack.push(new Array(signature));
  }
 
  private static String getSignatureForSingleDimensionArrayOfPrimitive(int type) {
    switch(type) {
      case 4: return "[Z";
      case 5: return "[C";
      case 6: return "[F";
      case 7: return "[D";
      case 8: return "[B";
      case 9: return "[S";
      case 10: return "[I";
      case 11: return "[J";
      default: throw new RuntimeException("unexpected primitive array type! '" + type + "'");
    }
  }
 
  @Override
  public String toString() {
    return "DecodedArrayCreationOp dimensions=" + dimensions + " signature=" + signature;
  }
}
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