1 /*
   2  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.interpreter;
  26 
  27 import sun.jvm.hotspot.oops.*;
  28 
  29 public abstract class BytecodeWideable extends Bytecode {
  30   BytecodeWideable(Method method, int bci) {
  31     super(method, bci);
  32   }
  33 
  34   public boolean isWide() {
  35     int prevBci = bci() - 1;
  36     return (prevBci > -1 && method.getBytecodeOrBPAt(prevBci) == Bytecodes._wide);
  37   }
  38 
  39   // the local variable index
  40   public int getLocalVarIndex() {
  41     return (isWide()) ? getIndexU2(code(), true) : getIndexU1();
  42   }
  43 }