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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/WriteNode.java @ 11959:23ccaa863eda

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made CodeCacheProvider independent of MetaAccessProvider (GRAAL-511)
author Doug Simon <doug.simon@oracle.com>
date Thu, 10 Oct 2013 16:14:55 +0200
parents f8a87f3fab5a
children bca33c3135de
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1 /*
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2 * Copyright (c) 2011, 2012, 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.oracle.graal.nodes.extended;
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24
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.nodes.*;
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27 import com.oracle.graal.nodes.extended.LocationNode.Location;
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28 import com.oracle.graal.nodes.spi.*;
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29 import com.oracle.graal.nodes.type.*;
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30 import com.oracle.graal.nodes.virtual.*;
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31
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32 /**
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33 * Writes a given {@linkplain #value() value} a {@linkplain AccessNode memory location}.
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34 */
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35 public final class WriteNode extends AccessNode implements StateSplit, LIRLowerable, MemoryCheckpoint.Single, Virtualizable {
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36
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37 @Input private ValueNode value;
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38 @Input(notDataflow = true) private FrameState stateAfter;
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39 private final boolean initialization;
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40
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41 public FrameState stateAfter() {
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42 return stateAfter;
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43 }
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44
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45 public void setStateAfter(FrameState x) {
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46 assert x == null || x.isAlive() : "frame state must be in a graph";
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47 updateUsages(stateAfter, x);
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48 stateAfter = x;
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49 }
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50
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51 public boolean hasSideEffect() {
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52 return true;
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53 }
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54
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55 public ValueNode value() {
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56 return value;
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57 }
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58
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59 /**
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60 * Returns whether this write is the initialization of the written location. If it is true, the
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61 * old value of the memory location is either uninitialized or zero. If it is false, the memory
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62 * location is guaranteed to contain a valid value or zero.
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63 */
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64 public boolean isInitialization() {
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65 return initialization;
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66 }
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67
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68 public WriteNode(ValueNode object, ValueNode value, ValueNode location, BarrierType barrierType, boolean compressible) {
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69 this(object, value, location, barrierType, compressible, false);
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70 }
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71
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72 public WriteNode(ValueNode object, ValueNode value, ValueNode location, BarrierType barrierType, boolean compressible, boolean initialization) {
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73 super(object, location, StampFactory.forVoid(), barrierType, compressible);
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74 this.value = value;
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75 this.initialization = initialization;
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76 }
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77
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78 @Override
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79 public void generate(LIRGeneratorTool gen) {
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80 Value address = location().generateAddress(gen, gen.operand(object()));
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81 gen.emitStore(location().getValueKind(), address, gen.operand(value()), this);
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82 }
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83
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84 @NodeIntrinsic
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85 public static native void writeMemory(Object object, Object value, Location location, @ConstantNodeParameter BarrierType barrierType, @ConstantNodeParameter boolean compressible);
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86
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87 @Override
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88 public LocationIdentity getLocationIdentity() {
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89 return location().getLocationIdentity();
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90 }
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91
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92 @Override
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93 public void virtualize(VirtualizerTool tool) {
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94 if (location() instanceof ConstantLocationNode) {
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95 ConstantLocationNode constantLocation = (ConstantLocationNode) location();
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96 State state = tool.getObjectState(object());
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97 if (state != null && state.getState() == EscapeState.Virtual) {
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98 VirtualObjectNode virtual = state.getVirtualObject();
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99 int entryIndex = virtual.entryIndexForOffset(constantLocation.getDisplacement());
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100 if (entryIndex != -1 && virtual.entryKind(entryIndex) == constantLocation.getValueKind()) {
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101 tool.setVirtualEntry(state, entryIndex, value());
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102 tool.delete();
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103 }
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104 }
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105 }
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106 }
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107 }