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annotate graal/Compiler/src/com/sun/c1x/ir/CompareAndSwap.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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9ec15d6914ca Pull over of compiler from maxine repository.
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1 /*
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2 * Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.c1x.ir;
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24
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25 import com.sun.c1x.debug.*;
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26 import com.sun.c1x.value.*;
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27 import com.sun.cri.bytecode.*;
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28
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29 /**
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30 * Atomic update of a value in memory. Implements the {@link Bytecodes#PCMPSWP} family of instructions.
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31 *
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32 * Compares a suspected value with the actual value in a memory location.
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33 * Iff they are same, a new value is placed into the location and the expected value is returned.
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34 * Otherwise, the actual value is returned.
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35 *
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36 * @author Doug Simon
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37 */
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38 public final class CompareAndSwap extends PointerOp {
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39
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40 /**
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41 * The value to store.
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42 */
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43 Value expectedValue;
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44
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45 Value newValue;
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46
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47 /**
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48 * Creates an instruction for a pointer store. If {@code displacement != null}, the effective of the address of the store is
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49 * computed as the pointer plus a byte displacement plus a scaled index. Otherwise, the effective address is computed as the
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50 * pointer plus a byte offset.
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51 * @param pointer the value producing the pointer
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52 * @param offset the value producing the byte offset
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53 * @param expectedValue the value that must currently being in memory location for the swap to occur
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54 * @param newValue the new value to store if the precondition is satisfied
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55 * @param stateBefore the state before
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56 * @param isVolatile {@code true} if the access is volatile
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57 */
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58 public CompareAndSwap(int opcode, Value pointer, Value offset, Value expectedValue, Value newValue, FrameState stateBefore, boolean isVolatile) {
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59 super(expectedValue.kind, expectedValue.kind, opcode, pointer, null, offset, stateBefore, isVolatile);
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60 assert offset != null;
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61 this.expectedValue = expectedValue;
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62 this.newValue = newValue;
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63 setFlag(Flag.LiveStore);
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64 }
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65
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66 @Override
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67 public void accept(ValueVisitor v) {
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68 v.visitCompareAndSwap(this);
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69 }
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70
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71 public Value expectedValue() {
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72 return expectedValue;
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73 }
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74
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75 public Value newValue() {
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76 return newValue;
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77 }
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78
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79 @Override
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80 public void inputValuesDo(ValueClosure closure) {
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81 super.inputValuesDo(closure);
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82 expectedValue = closure.apply(expectedValue);
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83 newValue = closure.apply(newValue);
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84 }
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85
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86 @Override
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87 public void print(LogStream out) {
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88 out.print(Bytecodes.nameOf(opcode)).print("(").print(pointer());
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89 out.print(" + ").print(offset());
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90 out.print(", ").print(expectedValue()).print(", ").print(newValue()).print(')');
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91 }
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92 }