hotspot/agent/src/share/classes/sun/jvm/hotspot/asm/x86/MoveDecoder.java

/*
 * Copyright 2002-2003 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

package sun.jvm.hotspot.asm.x86;

import sun.jvm.hotspot.asm.*;

public class MoveDecoder extends InstructionDecoder {
   public MoveDecoder(String name, int addrMode1, int operandType1, int addrMode2, int operandType2) {
      super(name, addrMode1, operandType1, addrMode2, operandType2);
   }

   protected Instruction decodeInstruction(byte[] bytesArray, boolean operandSize, boolean addrSize, X86InstructionFactory factory) {
      Operand op1 = getOperand1(bytesArray, operandSize, addrSize);
      Operand op2 = getOperand2(bytesArray, operandSize, addrSize);
      int size = byteIndex - instrStartIndex;

      if( (op1 instanceof X86Register) && (op2 instanceof ImmediateOrRegister) ) {
         return factory.newMoveInstruction(name, (X86Register)op1, (ImmediateOrRegister)op2, size, prefixes);
      }
      else if( (op1 instanceof Address) && (op2 instanceof Immediate) ) {
         return factory.newGeneralInstruction(name, op1, op2, size, prefixes);
      }
      else if( (op1 instanceof Address) && (op2 instanceof X86Register) ) {
         return factory.newMoveStoreInstruction(name, (Address)op1, (X86Register)op2, 0, size, prefixes);
      }
      else if( (op1 instanceof X86Register) && (op2 instanceof Address) ) {
         return factory.newMoveLoadInstruction(name, (X86Register)op1, (Address)op2, 0, size, prefixes);
      }

      return null;
   }
}