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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/FrameStateAssignmentPhase.java @ 11626:340e67bf1758

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Rename GuardsPhase to GuardsStage to avoid confusion with existing Phases
author Gilles Duboscq <duboscq@ssw.jku.at>
date Fri, 13 Sep 2013 14:47:04 +0200
parents ae619d70bf4b
children 1ca5e39d0433
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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.graph.*;
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28 import com.oracle.graal.graph.iterators.*;
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29 import com.oracle.graal.nodes.*;
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30 import com.oracle.graal.nodes.StructuredGraph.GuardsStage;
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31 import com.oracle.graal.nodes.util.*;
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32 import com.oracle.graal.phases.*;
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33 import com.oracle.graal.phases.graph.*;
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34 import com.oracle.graal.phases.graph.ReentrantNodeIterator.NodeIteratorClosure;
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35
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36 public class FrameStateAssignmentPhase extends Phase {
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37
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38 private static class FrameStateAssignmentClosure extends NodeIteratorClosure<FrameState> {
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39
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40 @Override
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41 protected FrameState processNode(FixedNode node, FrameState currentState) {
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42 if (node instanceof DeoptimizingNode) {
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43 DeoptimizingNode deopt = (DeoptimizingNode) node;
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44 if (deopt.canDeoptimize() && deopt.getDeoptimizationState() == null) {
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45 GraalInternalError.guarantee(currentState != null, "no FrameState at DeoptimizingNode %s", deopt);
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46 deopt.setDeoptimizationState(currentState);
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47 }
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48 }
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49
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50 if (node instanceof StateSplit) {
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51 StateSplit stateSplit = (StateSplit) node;
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52 if (stateSplit.stateAfter() != null) {
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53 FrameState newState = stateSplit.stateAfter();
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54 stateSplit.setStateAfter(null);
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55 return newState;
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56 }
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57 }
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58 return currentState;
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59 }
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60
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61 @Override
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62 protected FrameState merge(MergeNode merge, List<FrameState> states) {
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63 return merge.stateAfter() != null ? merge.stateAfter() : singleFrameState(merge, states);
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64 }
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65
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66 @Override
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67 protected FrameState afterSplit(AbstractBeginNode node, FrameState oldState) {
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68 return oldState;
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69 }
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70
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71 @Override
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72 protected Map<LoopExitNode, FrameState> processLoop(LoopBeginNode loop, FrameState initialState) {
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73 return ReentrantNodeIterator.processLoop(this, loop, initialState).exitStates;
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74 }
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75 }
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76
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77 @Override
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78 protected void run(StructuredGraph graph) {
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79 assert checkFixedDeopts(graph);
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80 ReentrantNodeIterator.apply(new FrameStateAssignmentClosure(), graph.start(), null, null);
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81
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82 graph.setGuardsPhase(GuardsStage.AFTER_FSA);
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83 }
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84
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85 private static boolean checkFixedDeopts(StructuredGraph graph) {
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86 NodePredicate isFloatingNode = GraphUtil.isFloatingNode();
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87 for (Node n : graph.getNodes().filterInterface(DeoptimizingNode.class)) {
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88 if (((DeoptimizingNode) n).canDeoptimize() && isFloatingNode.apply(n)) {
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89 return false;
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90 }
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91 }
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92 return true;
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93 }
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94
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95 private static FrameState singleFrameState(@SuppressWarnings("unused") MergeNode merge, List<FrameState> states) {
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96 FrameState singleState = states.get(0);
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97 for (int i = 1; i < states.size(); ++i) {
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98 if (states.get(i) != singleState) {
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99 return null;
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100 }
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101 }
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102 return singleState;
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103 }
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104 }