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comparison graal/Compiler/src/com/sun/c1x/ir/AccessMonitor.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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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.value.*;
26 import com.sun.cri.ci.*;
27
28 /**
29 * The {@code AccessMonitor} instruction is the base class of both monitor acquisition and release.
30 *
31 * @author Ben L. Titzer
32 */
33 public abstract class AccessMonitor extends StateSplit {
34
35 /**
36 * The object locked or unlocked by this instruction.
37 */
38 private Value object;
39
40 /**
41 * The address of the on-stack lock object or {@code null} if the runtime does not place locks on the stack.
42 */
43 private Value lockAddress;
44
45 /**
46 * The lock number of this monitor access.
47 */
48 public final int lockNumber;
49
50
51 /**
52 * Creates a new AccessMonitor instruction.
53 *
54 * @param object the instruction producing the object
55 * @param lockAddress the address of the on-stack lock object or {@code null} if the runtime does not place locks on the stack
56 * @param stateBefore the state before executing the monitor operation
57 * @param lockNumber the number of the lock being acquired
58 */
59 public AccessMonitor(Value object, Value lockAddress, FrameState stateBefore, int lockNumber) {
60 super(CiKind.Illegal, stateBefore);
61 this.object = object;
62 this.lockAddress = lockAddress;
63 this.lockNumber = lockNumber;
64 }
65
66 /**
67 * Gets the instruction producing the object locked or unlocked by this instruction.
68 */
69 public Value object() {
70 return object;
71 }
72
73 /**
74 * Gets the instruction producing the address of the lock object.
75 */
76 public Value lockAddress() {
77 return lockAddress;
78 }
79
80 @Override
81 public void inputValuesDo(ValueClosure closure) {
82 object = closure.apply(object);
83 if (lockAddress != null) {
84 lockAddress = closure.apply(lockAddress);
85 }
86 }
87 }