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comparison graal/GraalCompiler/src/com/sun/c1x/ir/MonitorEnter.java @ 2509:16b9a8b5ad39

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Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:50:44 +0200
parents graal/Compiler/src/com/sun/c1x/ir/MonitorEnter.java@9ec15d6914ca
children 0f9eeb15e636
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2508:fea94949e0a2 2509:16b9a8b5ad39
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 }