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comparison agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeWideable.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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()) ? (int) (0xFFFF & javaShortAt(1))
42 : (int) (0xFF & javaByteAt(1));
43 }
44 }