Mercurial > hg > truffle

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children c18cbe5936b8
comparison
equal deleted inserted replaced
-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2002-2005 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 BytecodeIinc extends BytecodeWideable {
31 BytecodeIinc(Method method, int bci) {
32 super(method, bci);
33 }
34
35 public int getIncrement() {
36 // increment is signed
37 return (isWide()) ? (int) javaShortAt(3) : (int) javaByteAt(2);
38 }
39
40 public void verify() {
41 if (Assert.ASSERTS_ENABLED) {
42 Assert.that(isValid(), "check iinc");
43 }
44 }
45
46 public boolean isValid() {
47 return javaCode() == Bytecodes._iinc;
48 }
49
50 public static BytecodeIinc at(Method method, int bci) {
51 BytecodeIinc b = new BytecodeIinc(method, bci);
52 if (Assert.ASSERTS_ENABLED) {
53 b.verify();
54 }
55 return b;
56 }
57
58 /** Like at, but returns null if the BCI is not at iinc */
59 public static BytecodeIinc atCheck(Method method, int bci) {
60 BytecodeIinc b = new BytecodeIinc(method, bci);
61 return (b.isValid() ? b : null);
62 }
63
64 public static BytecodeIinc at(BytecodeStream bcs) {
65 return new BytecodeIinc(bcs.method(), bcs.bci());
66 }
67
68 public String toString() {
69 StringBuffer buf = new StringBuffer();
70 buf.append("iinc");
71 buf.append(spaces);
72 buf.append('#');
73 buf.append(Integer.toString(getLocalVarIndex()));
74 buf.append(" by ");
75 buf.append(Integer.toString(getIncrement()));
76 return buf.toString();
77 }
78 }