/*

 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. 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.

 *

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package sun.jvm.hotspot.interpreter;

import sun.jvm.hotspot.oops.*;

import sun.jvm.hotspot.runtime.*;

// any bytecode with constant pool index

public abstract class BytecodeWithCPIndex extends Bytecode {

  BytecodeWithCPIndex(Method method, int bci) {

    super(method, bci);

  }

  // the constant pool index for this bytecode

  public int getSecondaryIndex() {

     throw new IllegalArgumentException("must be invokedynamic");

  }

  protected int indexForFieldOrMethod() {

     ConstantPoolCache cpCache = method().getConstants().getCache();

     // get ConstantPool index from ConstantPoolCacheIndex at given bci

     int cpCacheIndex = index();

     if (cpCache == null) {

        return cpCacheIndex;

     } else if (code() == Bytecodes._invokedynamic) {

        int secondaryIndex = getSecondaryIndex();

        return cpCache.getMainEntryAt(secondaryIndex).getConstantPoolIndex();

     } else {

        // change byte-ordering and go via cache

        return cpCache.getEntryAt((int) (0xFFFF & VM.getVM().getBytes().swapShort((short) cpCacheIndex))).getConstantPoolIndex();

     }

  }

}