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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/ValueAnchorNode.java @ 13277:ce017d1e4234

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Merge.
author Christian Humer <christian.humer@gmail.com>
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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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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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 }