Mercurial > hg > truffle
comparison graal/GraalCompiler/src/com/sun/c1x/ir/CompareAndSwap.java @ 2509:16b9a8b5ad39
Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:50:44 +0200 |
parents | graal/Compiler/src/com/sun/c1x/ir/CompareAndSwap.java@9ec15d6914ca |
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2508:fea94949e0a2 | 2509:16b9a8b5ad39 |
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1 /* | |
2 * Copyright (c) 2010, 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 import com.sun.cri.bytecode.*; | |
28 | |
29 /** | |
30 * Atomic update of a value in memory. Implements the {@link Bytecodes#PCMPSWP} family of instructions. | |
31 * | |
32 * Compares a suspected value with the actual value in a memory location. | |
33 * Iff they are same, a new value is placed into the location and the expected value is returned. | |
34 * Otherwise, the actual value is returned. | |
35 * | |
36 * @author Doug Simon | |
37 */ | |
38 public final class CompareAndSwap extends PointerOp { | |
39 | |
40 /** | |
41 * The value to store. | |
42 */ | |
43 Value expectedValue; | |
44 | |
45 Value newValue; | |
46 | |
47 /** | |
48 * Creates an instruction for a pointer store. If {@code displacement != null}, the effective of the address of the store is | |
49 * computed as the pointer plus a byte displacement plus a scaled index. Otherwise, the effective address is computed as the | |
50 * pointer plus a byte offset. | |
51 * @param pointer the value producing the pointer | |
52 * @param offset the value producing the byte offset | |
53 * @param expectedValue the value that must currently being in memory location for the swap to occur | |
54 * @param newValue the new value to store if the precondition is satisfied | |
55 * @param stateBefore the state before | |
56 * @param isVolatile {@code true} if the access is volatile | |
57 */ | |
58 public CompareAndSwap(int opcode, Value pointer, Value offset, Value expectedValue, Value newValue, FrameState stateBefore, boolean isVolatile) { | |
59 super(expectedValue.kind, expectedValue.kind, opcode, pointer, null, offset, stateBefore, isVolatile); | |
60 assert offset != null; | |
61 this.expectedValue = expectedValue; | |
62 this.newValue = newValue; | |
63 setFlag(Flag.LiveStore); | |
64 } | |
65 | |
66 @Override | |
67 public void accept(ValueVisitor v) { | |
68 v.visitCompareAndSwap(this); | |
69 } | |
70 | |
71 public Value expectedValue() { | |
72 return expectedValue; | |
73 } | |
74 | |
75 public Value newValue() { | |
76 return newValue; | |
77 } | |
78 | |
79 @Override | |
80 public void inputValuesDo(ValueClosure closure) { | |
81 super.inputValuesDo(closure); | |
82 expectedValue = closure.apply(expectedValue); | |
83 newValue = closure.apply(newValue); | |
84 } | |
85 | |
86 @Override | |
87 public void print(LogStream out) { | |
88 out.print(Bytecodes.nameOf(opcode)).print("(").print(pointer()); | |
89 out.print(" + ").print(offset()); | |
90 out.print(", ").print(expectedValue()).print(", ").print(newValue()).print(')'); | |
91 } | |
92 } |