Mercurial > hg > graal-compiler
comparison agent/src/share/classes/sun/jvm/hotspot/interpreter/BytecodeIf.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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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 import sun.jvm.hotspot.utilities.*; | |
29 | |
30 public class BytecodeIf extends BytecodeJmp { | |
31 BytecodeIf(Method method, int bci) { | |
32 super(method, bci); | |
33 } | |
34 | |
35 public int getTargetBCI() { | |
36 return bci() + javaShortAt(1); | |
37 } | |
38 | |
39 public void verify() { | |
40 if (Assert.ASSERTS_ENABLED) { | |
41 Assert.that(isValid(), "check if"); | |
42 } | |
43 } | |
44 | |
45 public boolean isValid() { | |
46 int jcode = javaCode(); | |
47 return (jcode >= Bytecodes._ifeq && jcode <= Bytecodes._if_acmpne) || | |
48 jcode == Bytecodes._ifnull || jcode == Bytecodes._ifnonnull; | |
49 } | |
50 | |
51 public static BytecodeIf at(Method method, int bci) { | |
52 BytecodeIf b = new BytecodeIf(method, bci); | |
53 if (Assert.ASSERTS_ENABLED) { | |
54 b.verify(); | |
55 } | |
56 return b; | |
57 } | |
58 | |
59 /** Like at, but returns null if the BCI is not at some ifxxx bytecode */ | |
60 public static BytecodeIf atCheck(Method method, int bci) { | |
61 BytecodeIf b = new BytecodeIf(method, bci); | |
62 return (b.isValid() ? b : null); | |
63 } | |
64 | |
65 public static BytecodeIf at(BytecodeStream bcs) { | |
66 return new BytecodeIf(bcs.method(), bcs.bci()); | |
67 } | |
68 } |