Package bytecodeparser.analysis.decoders

Source Code of bytecodeparser.analysis.decoders.DecodedOp

/*
*  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.CodeIterator;
import bytecodeparser.Context;
import bytecodeparser.analysis.Opcodes.OpParameterType;
import bytecodeparser.analysis.opcodes.Op;
import bytecodeparser.analysis.stack.Stack;

/**
* A decoded Op.
* @author Stephane Godbillon
*
*/
public abstract class DecodedOp {
  /**
   * The context in which this op has been decoded.
   */
  public final Context context;
  /**
   * The index at which this op has been decoded.
   */
  public final int index;
  /**
   * The op that has been decoded.
   */
  public final Op op;
 
  public final OpParameterType[] parameterTypes;
  public final int[] parameterValues;
 
  public DecodedOp(Op op, Context context, int index) {
    this(op, context, index, op.getParameterTypes());
  }
 
  public DecodedOp(Op op, Context context, int index, OpParameterType[] parameterTypes) {
    this(op, context, index, parameterTypes, decodeValues(parameterTypes, context.iterator, index));
  }
 
  public DecodedOp(Op op, Context context, int index, OpParameterType[] parameterTypes, int[] parameterValues) {
    this.context = context;
    this.index = index;
    this.op = op;
    this.parameterTypes = parameterTypes;
    this.parameterValues = parameterValues;
  }
 
  public static int[] decodeValues(OpParameterType[] parameterTypes, CodeIterator iterator, int index) {
    int[] result = new int[parameterTypes.length];
    int nextValIndex = index + 1;
    for(int i = 0; i < parameterTypes.length; i++) {
      OpParameterType type = parameterTypes[i];
      result[i] = decodeValueAt(type, iterator, nextValIndex);
      nextValIndex += type.size;
    }
    return result;
  }
 
  public static int decodeValueAt(OpParameterType type, CodeIterator iterator, int index) {
    switch(type) {
      case S1:
        return iterator.byteAt(index);
      case S2:
        return iterator.s16bitAt(index);
      case S4:
        return iterator.s32bitAt(index);
      case U1:
        return iterator.byteAt(index);
      case U2:
        return iterator.u16bitAt(index);
      case U4:
      default:
        throw new RuntimeException("unsupported");
     
    }
  }
 
  /**
   * Simulate this op onto the given stack.
   * @param stack
   */
  public abstract void simulate(Stack stack);
}
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