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annotate graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/SnippetFrameStateCleanupPhase.java @ 11717:8a3b59397044

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The SnippetFrameStateCleanupPhase now sets invalid framestates on the paths of side effecting instruction except for the last one where an AFTER_BCI is used. Remove InsertStateAfterPlaceholderPhase
author Gilles Duboscq <duboscq@ssw.jku.at>
date Tue, 17 Sep 2013 18:05:11 +0200
parents 76c40c3f6bb7
children 713a08116e97
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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.replacements;
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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.util.*;
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29 import com.oracle.graal.phases.*;
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30 import com.oracle.graal.phases.graph.*;
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31 import com.oracle.graal.phases.graph.ReentrantNodeIterator.LoopInfo;
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32 import com.oracle.graal.phases.graph.ReentrantNodeIterator.NodeIteratorClosure;
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33
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34 /**
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35 * Removes frame states from {@linkplain StateSplit#hasSideEffect() non-side-effecting} nodes in a
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36 * snippet.
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37 *
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38 * The frame states of side-effecting nodes are replaced with
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39 * {@linkplain FrameState#INVALID_FRAMESTATE_BCI invalid} frame states. Loops that contain invalid
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40 * frame states are also assigned an invalid frame state.
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41 *
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42 * The invalid frame states ensure that no deoptimization to a snippet frame state will happen.
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43 */
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44 public class SnippetFrameStateCleanupPhase extends Phase {
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45
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46 @Override
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47 protected void run(StructuredGraph graph) {
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48 ReentrantNodeIterator.apply(new SnippetFrameStateCleanupClosure(), graph.start(), null, null);
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49 }
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50
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51 private static class SnippetFrameStateCleanupClosure extends NodeIteratorClosure<StateSplit> {
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52
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53 @Override
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54 protected StateSplit processNode(FixedNode node, StateSplit currentState) {
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55 StateSplit state = currentState;
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56 if (node instanceof StateSplit) {
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57 StateSplit stateSplit = (StateSplit) node;
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58 FrameState frameState = stateSplit.stateAfter();
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59 if (frameState != null) {
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60 if (stateSplit.hasSideEffect()) {
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61 stateSplit.setStateAfter(createInvalidFrameState(node));
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62 state = stateSplit;
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63 } else if (hasInvalidState(state)) {
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64 stateSplit.setStateAfter(createInvalidFrameState(node));
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65 } else {
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66 stateSplit.setStateAfter(null);
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67 }
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68 if (frameState.usages().isEmpty()) {
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69 GraphUtil.killWithUnusedFloatingInputs(frameState);
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70 }
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71 }
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72 }
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73 if (node instanceof ControlSinkNode && state != null) {
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74 state.setStateAfter(node.graph().add(new FrameState(FrameState.AFTER_BCI)));
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75 }
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76 return state;
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77 }
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78
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79 @Override
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80 protected StateSplit merge(MergeNode merge, List<StateSplit> states) {
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81 return merge;
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82 }
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83
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84 @Override
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85 protected StateSplit afterSplit(AbstractBeginNode node, StateSplit oldState) {
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86 return oldState;
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87 }
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88
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89 @Override
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90 protected Map<LoopExitNode, StateSplit> processLoop(LoopBeginNode loop, StateSplit initialState) {
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91 LoopInfo<StateSplit> info = ReentrantNodeIterator.processLoop(this, loop, initialState);
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92 if (!hasInvalidState(initialState)) {
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93 boolean isNowInvalid = false;
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94 for (StateSplit endState : info.endStates.values()) {
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95 isNowInvalid |= hasInvalidState(endState);
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96 }
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97 if (isNowInvalid) {
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98 loop.setStateAfter(createInvalidFrameState(loop));
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99 info = ReentrantNodeIterator.processLoop(this, loop, loop);
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100 }
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101 }
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102 return info.exitStates;
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103 }
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104
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105 private static boolean hasInvalidState(StateSplit state) {
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106 return state != null && state.stateAfter() != null && state.stateAfter().bci == FrameState.INVALID_FRAMESTATE_BCI;
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107 }
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108
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109 private static FrameState createInvalidFrameState(FixedNode node) {
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110 return node.graph().add(new FrameState(FrameState.INVALID_FRAMESTATE_BCI));
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111 }
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112 }
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113 }