hotspot/agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeWithCPIndex.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.
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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 index() { return 0xFFFF & javaShortAt(1); }

  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 {
        // change byte-ordering and go via cache
        return cpCache.getEntryAt((int) (0xFFFF & VM.getVM().getBytes().swapShort((short) cpCacheIndex))).getConstantPoolIndex();
     }
  }
}