Mercurial > hg > graal-compiler
comparison graal/Compiler/src/com/sun/c1x/ir/MonitorEnter.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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2506:4a3bf8a5bf41 | 2507:9ec15d6914ca |
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1 /* | |
2 * Copyright (c) 2009, 2011, 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 package com.sun.c1x.ir; | |
24 | |
25 import com.sun.c1x.debug.*; | |
26 import com.sun.c1x.value.*; | |
27 | |
28 /** | |
29 * The {@code MonitorEnter} instruction represents the acquisition of a monitor. | |
30 * | |
31 * @author Ben L. Titzer | |
32 */ | |
33 public final class MonitorEnter extends AccessMonitor { | |
34 | |
35 private FrameState stateAfter; | |
36 | |
37 /** | |
38 * Creates a new MonitorEnter instruction. | |
39 * | |
40 * @param object the instruction producing the object | |
41 * @param lockAddress the address of the on-stack lock object or {@code null} if the runtime does not place locks on the stack | |
42 * @param lockNumber the number of the lock | |
43 * @param stateBefore the state before | |
44 */ | |
45 public MonitorEnter(Value object, Value lockAddress, int lockNumber, FrameState stateBefore) { | |
46 super(object, lockAddress, stateBefore, lockNumber); | |
47 if (object.isNonNull()) { | |
48 eliminateNullCheck(); | |
49 } | |
50 } | |
51 | |
52 /** | |
53 * Checks whether this instruction can trap. | |
54 * @return {@code true} if this instruction may raise a {@link NullPointerException} | |
55 */ | |
56 @Override | |
57 public boolean canTrap() { | |
58 return needsNullCheck(); | |
59 } | |
60 | |
61 @Override | |
62 public void accept(ValueVisitor v) { | |
63 v.visitMonitorEnter(this); | |
64 } | |
65 | |
66 public void setStateAfter(FrameState frameState) { | |
67 this.stateAfter = frameState; | |
68 } | |
69 | |
70 @Override | |
71 public FrameState stateAfter() { | |
72 return stateAfter; | |
73 } | |
74 | |
75 @Override | |
76 public void print(LogStream out) { | |
77 out.print("enter monitor[").print(lockNumber).print("](").print(object()).print(')'); | |
78 } | |
79 } |