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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/DeoptimizationGroupingPhase.java @ 11836:d72c314260dc

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Add a DynamicDeoptimizeNode where the action and reason is a input node.
author Gilles Duboscq <duboscq@ssw.jku.at>
date Thu, 26 Sep 2013 17:30:19 +0200
parents 3e4482a06170
children 51d5a22e0ea9
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1 /*
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2 * Copyright (c) 2013, 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.phases.common;
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24
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25 import java.util.*;
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26
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27 import com.oracle.graal.nodes.*;
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28 import com.oracle.graal.nodes.cfg.*;
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29 import com.oracle.graal.phases.*;
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30
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31 /**
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32 * This phase tries to find {@link AbstractDeoptimizeNode DeoptimizeNodes} which use the same
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33 * {@link FrameState} and merges them together.
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34 */
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35 public class DeoptimizationGroupingPhase extends Phase {
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36
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37 @Override
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38 protected void run(StructuredGraph graph) {
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39 ControlFlowGraph cfg = null;
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40 for (FrameState fs : graph.getNodes(FrameState.class)) {
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41 FixedNode target = null;
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42 List<AbstractDeoptimizeNode> obsoletes = null;
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43 for (AbstractDeoptimizeNode deopt : fs.usages().filter(AbstractDeoptimizeNode.class)) {
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44 if (target == null) {
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45 target = deopt;
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46 } else {
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47 if (cfg == null) {
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48 cfg = ControlFlowGraph.compute(graph, true, true, false, false);
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49 }
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50 MergeNode merge;
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51 if (target instanceof AbstractDeoptimizeNode) {
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52 merge = graph.add(new MergeNode());
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53 EndNode firstEnd = graph.add(new EndNode());
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54 merge.addForwardEnd(firstEnd);
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55 target.predecessor().replaceFirstSuccessor(target, firstEnd);
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56 exitLoops((AbstractDeoptimizeNode) target, firstEnd, cfg);
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57 merge.setNext(target);
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58 obsoletes = new LinkedList<>();
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59 target = merge;
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60 } else {
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61 merge = (MergeNode) target;
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62 }
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63 EndNode newEnd = graph.add(new EndNode());
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64 merge.addForwardEnd(newEnd);
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65 deopt.predecessor().replaceFirstSuccessor(deopt, newEnd);
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66 exitLoops(deopt, newEnd, cfg);
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67 obsoletes.add(deopt);
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68 }
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69 }
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70 if (obsoletes != null) {
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71 for (AbstractDeoptimizeNode obsolete : obsoletes) {
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72 obsolete.safeDelete();
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73 }
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74 }
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75 }
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76 }
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77
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78 private static void exitLoops(AbstractDeoptimizeNode deopt, EndNode end, ControlFlowGraph cfg) {
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79 Block block = cfg.blockFor(deopt);
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80 Loop loop = block.getLoop();
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81 while (loop != null) {
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82 end.graph().addBeforeFixed(end, end.graph().add(new LoopExitNode(loop.loopBegin())));
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83 loop = loop.parent;
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84 }
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85 }
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86 }