Mercurial > hg > truffle
annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/ValueAnchorNode.java @ 13277:ce017d1e4234
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author | Christian Humer <christian.humer@gmail.com> |
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date | Mon, 09 Dec 2013 17:31:12 +0100 |
parents | 56a11c0d689b |
children | b602356a9cfc 1cf373d2b415 |
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1 /* |
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2 * Copyright (c) 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.oracle.graal.nodes.extended; |
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24 |
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25 import com.oracle.graal.graph.*; |
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26 import com.oracle.graal.graph.spi.*; |
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27 import com.oracle.graal.nodes.*; |
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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 * The ValueAnchor instruction keeps non-CFG (floating) nodes above a certain point in the graph. |
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33 */ |
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34 public final class ValueAnchorNode extends FixedWithNextNode implements Canonicalizable, LIRLowerable, Virtualizable, GuardingNode { |
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35 |
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36 @Input private ValueNode anchored; |
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37 |
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38 public ValueAnchorNode(ValueNode value) { |
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39 super(StampFactory.dependency()); |
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40 this.anchored = value; |
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41 } |
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42 |
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43 @Override |
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44 public void generate(LIRGeneratorTool gen) { |
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45 // Nothing to emit, since this node is used for structural purposes only. |
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46 } |
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47 |
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48 public ValueNode getAnchoredNode() { |
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49 return anchored; |
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50 } |
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51 |
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52 @Override |
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53 public Node canonical(CanonicalizerTool tool) { |
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54 if (anchored != null && !anchored.isConstant() && !(anchored instanceof FixedNode)) { |
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55 // Found entry that needs this anchor. |
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56 return this; |
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57 } |
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58 |
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59 if (usages().isNotEmpty()) { |
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60 // A not uses this anchor => anchor is necessary. |
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61 return this; |
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62 } |
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63 |
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64 // Anchor is not necessary any more => remove. |
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65 return null; |
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66 } |
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67 |
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68 @Override |
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69 public void virtualize(VirtualizerTool tool) { |
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70 if (anchored != null && !(anchored instanceof AbstractBeginNode)) { |
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71 State state = tool.getObjectState(anchored); |
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72 if (state == null || state.getState() != EscapeState.Virtual) { |
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73 return; |
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74 } |
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75 } |
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76 tool.delete(); |
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77 } |
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78 |
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79 public void removeAnchoredNode() { |
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80 this.updateUsages(anchored, null); |
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81 this.anchored = null; |
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82 } |
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83 } |