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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/GuardedValueNode.java @ 11631:1aed684853f6

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refactored IterableNodeType into a top level type to avoid problems it was causing for javac and JDT (CR-1408)
author Doug Simon <doug.simon@oracle.com>
date Fri, 13 Sep 2013 16:08:23 +0200
parents ef6915cf1e59
children 9a747d8e0d0f
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1 /*
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2 * Copyright (c) 2013, 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;
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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.graph.*;
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27 import com.oracle.graal.nodes.extended.*;
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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
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31 /**
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32 * A node that changes the type of its input, usually narrowing it. For example, a GuardedValueNode
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33 * is used to keep the nodes depending on guards inside a loop during speculative guard movement.
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34 *
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35 * A GuardedValueNode will only go away if its guard is null or {@link StructuredGraph#start()}.
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36 */
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37 public class GuardedValueNode extends FloatingGuardedNode implements LIRLowerable, Virtualizable, IterableNodeType, GuardingNode, Canonicalizable, ValueProxy {
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38
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39 @Input private ValueNode object;
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40
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41 public GuardedValueNode(ValueNode object, GuardingNode guard, Stamp stamp) {
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42 super(stamp, guard);
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43 this.object = object;
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44 }
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45
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46 public GuardedValueNode(ValueNode object, GuardingNode guard) {
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47 this(object, guard, object.stamp());
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48 }
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49
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50 public ValueNode object() {
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51 return object;
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52 }
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53
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54 @Override
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55 public void generate(LIRGeneratorTool generator) {
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56 if (object.kind() != Kind.Void && object.kind() != Kind.Illegal) {
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57 generator.setResult(this, generator.operand(object));
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58 }
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59 }
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60
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61 @Override
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62 public boolean inferStamp() {
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63 if (stamp() instanceof ObjectStamp && object().stamp() instanceof ObjectStamp) {
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64 return updateStamp(((ObjectStamp) object().stamp()).castTo((ObjectStamp) stamp()));
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65 }
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66 return updateStamp(object().stamp().join(stamp()));
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67 }
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68
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69 @Override
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70 public void virtualize(VirtualizerTool tool) {
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71 State state = tool.getObjectState(object);
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72 if (state != null && state.getState() == EscapeState.Virtual) {
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73 tool.replaceWithVirtual(state.getVirtualObject());
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74 }
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75 }
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76
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77 public ValueNode canonical(CanonicalizerTool tool) {
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78 if (getGuard() == graph().start()) {
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79 if (stamp().equals(object().stamp())) {
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80 return object();
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81 } else {
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82 return graph().unique(new PiNode(object(), stamp()));
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83 }
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84 }
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85 return this;
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86 }
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87
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88 @Override
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89 public ValueNode getOriginalValue() {
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90 return object;
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91 }
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92 }