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

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
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 import sun.jvm.hotspot.utilities.*;
29
30 public class BytecodeStore extends BytecodeLoadStore {
31 BytecodeStore(Method method, int bci) {
32 super(method, bci);
33 }
34
35 public void verify() {
36 if (Assert.ASSERTS_ENABLED) {
37 Assert.that(isValid(), "check store");
38 }
39 }
40
41 public boolean isValid() {
42 int jcode = javaCode();
43 switch (jcode) {
44 case Bytecodes._istore:
45 case Bytecodes._lstore:
46 case Bytecodes._fstore:
47 case Bytecodes._dstore:
48 case Bytecodes._astore:
49 return true;
50 default:
51 return false;
52 }
53 }
54
55 public static BytecodeStore at(Method method, int bci) {
56 BytecodeStore b = new BytecodeStore(method, bci);
57 if (Assert.ASSERTS_ENABLED) {
58 b.verify();
59 }
60 return b;
61 }
62
63 /** Like at, but returns null if the BCI is not at store */
64 public static BytecodeStore atCheck(Method method, int bci) {
65 BytecodeStore b = new BytecodeStore(method, bci);
66 return (b.isValid() ? b : null);
67 }
68
69 public static BytecodeStore at(BytecodeStream bcs) {
70 return new BytecodeStore(bcs.method(), bcs.bci());
71 }
72 }