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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/DeoptimizationGroupingPhase.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 51d5a22e0ea9
children 5a9afbf72714
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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.api.meta.*;
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28 import com.oracle.graal.nodes.*;
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29 import com.oracle.graal.nodes.cfg.*;
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30 import com.oracle.graal.phases.*;
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31 import com.oracle.graal.phases.tiers.*;
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32
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33 /**
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34 * This phase tries to find {@link AbstractDeoptimizeNode DeoptimizeNodes} which use the same
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35 * {@link FrameState} and merges them together.
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36 */
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37 public class DeoptimizationGroupingPhase extends BasePhase<MidTierContext> {
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38
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39 @Override
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40 protected void run(StructuredGraph graph, MidTierContext context) {
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41 ControlFlowGraph cfg = null;
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42 for (FrameState fs : graph.getNodes(FrameState.class)) {
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43 FixedNode target = null;
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44 PhiNode phi = null;
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45 List<AbstractDeoptimizeNode> obsoletes = null;
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46 for (AbstractDeoptimizeNode deopt : fs.usages().filter(AbstractDeoptimizeNode.class)) {
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47 if (target == null) {
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48 target = deopt;
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49 } else {
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50 if (cfg == null) {
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51 cfg = ControlFlowGraph.compute(graph, true, true, false, false);
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52 }
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53 MergeNode merge;
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54 if (target instanceof AbstractDeoptimizeNode) {
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55 merge = graph.add(new MergeNode());
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56 EndNode firstEnd = graph.add(new EndNode());
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57 phi = graph.addWithoutUnique(new PhiNode(Kind.Int, merge));
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58 merge.addForwardEnd(firstEnd);
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59 phi.addInput(((AbstractDeoptimizeNode) target).getActionAndReason(context.getMetaAccess()));
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60 target.predecessor().replaceFirstSuccessor(target, firstEnd);
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61
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62 exitLoops((AbstractDeoptimizeNode) target, firstEnd, cfg);
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63
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64 merge.setNext(graph.add(new DynamicDeoptimizeNode(phi)));
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65 obsoletes = new LinkedList<>();
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66 obsoletes.add((AbstractDeoptimizeNode) target);
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67 target = merge;
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68 } else {
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69 merge = (MergeNode) target;
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70 }
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71 EndNode newEnd = graph.add(new EndNode());
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72 merge.addForwardEnd(newEnd);
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73 phi.addInput(deopt.getActionAndReason(context.getMetaAccess()));
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74 deopt.predecessor().replaceFirstSuccessor(deopt, newEnd);
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75 exitLoops(deopt, newEnd, cfg);
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76 obsoletes.add(deopt);
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77 }
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78 }
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79 if (obsoletes != null) {
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80 ((DynamicDeoptimizeNode) ((MergeNode) target).next()).setDeoptimizationState(fs);
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81 for (AbstractDeoptimizeNode obsolete : obsoletes) {
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82 obsolete.safeDelete();
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83 }
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84 }
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85 }
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86 }
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87
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88 private static void exitLoops(AbstractDeoptimizeNode deopt, EndNode end, ControlFlowGraph cfg) {
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89 Block block = cfg.blockFor(deopt);
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90 Loop loop = block.getLoop();
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91 while (loop != null) {
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92 end.graph().addBeforeFixed(end, end.graph().add(new LoopExitNode(loop.loopBegin())));
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93 loop = loop.parent;
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94 }
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95 }
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96 }