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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/phases/OnStackReplacementPhase.java @ 9533:298e47193781

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Fix for delayed OSR: we must drop the precise stamps we have on the OSR locals since they may be too precise because of branch pruining in the graph builder.
author Gilles Duboscq <duboscq@ssw.jku.at>
date Fri, 03 May 2013 15:19:08 +0200
parents 8f854c4deabf
children 2eb56f87b01e
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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.hotspot.phases;
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24
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25 import com.oracle.graal.api.code.*;
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26 import com.oracle.graal.debug.*;
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27 import com.oracle.graal.graph.*;
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28 import com.oracle.graal.graph.Node.Verbosity;
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29 import com.oracle.graal.graph.iterators.*;
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30 import com.oracle.graal.loop.*;
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31 import com.oracle.graal.nodes.*;
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32 import com.oracle.graal.nodes.extended.*;
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33 import com.oracle.graal.nodes.type.*;
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34 import com.oracle.graal.nodes.util.*;
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35 import com.oracle.graal.phases.*;
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36 import com.oracle.graal.phases.common.*;
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37
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38 public class OnStackReplacementPhase extends Phase {
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39
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40 @Override
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41 protected void run(StructuredGraph graph) {
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42 if (graph.getEntryBCI() == StructuredGraph.INVOCATION_ENTRY_BCI) {
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43 // This happens during inlining in a OSR method, because the same phase plan will be
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44 // used.
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45 return;
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46 }
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47 Debug.dump(graph, "OnStackReplacement initial");
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48 EntryMarkerNode osr;
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49 do {
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50 NodeIterable<EntryMarkerNode> osrNodes = graph.getNodes(EntryMarkerNode.class);
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51 osr = osrNodes.first();
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52 if (osr == null) {
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53 throw new BailoutException("No OnStackReplacementNode generated");
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54 }
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55 if (osrNodes.count() > 1) {
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56 throw new GraalInternalError("Multiple OnStackReplacementNodes generated");
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57 }
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58 if (osr.stateAfter().locksSize() != 0) {
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59 throw new BailoutException("OSR with locks not supported");
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60 }
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61 if (osr.stateAfter().stackSize() != 0) {
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62 throw new BailoutException("OSR with stack entries not supported: " + osr.stateAfter().toString(Verbosity.Debugger));
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63 }
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64 LoopEx osrLoop = null;
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65 LoopsData loops = new LoopsData(graph);
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66 for (LoopEx loop : loops.loops()) {
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67 if (loop.inside().contains(osr)) {
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68 osrLoop = loop;
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69 break;
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70 }
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71 }
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72 if (osrLoop == null) {
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73 break;
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74 }
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75
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76 LoopTransformations.peel(osrLoop);
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77 for (Node usage : osr.usages().snapshot()) {
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78 ProxyNode proxy = (ProxyNode) usage;
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79 proxy.replaceAndDelete(proxy.value());
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80 }
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81 FixedNode next = osr.next();
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82 osr.setNext(null);
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83 ((FixedWithNextNode) osr.predecessor()).setNext(next);
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84 GraphUtil.killWithUnusedFloatingInputs(osr);
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85 Debug.dump(graph, "OnStackReplacement loop peeling result");
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86 } while (true);
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87
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88 FrameState osrState = osr.stateAfter();
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89 osr.setStateAfter(null);
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90 OSRStartNode osrStart = graph.add(new OSRStartNode());
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91 StartNode start = graph.start();
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92 FixedNode next = osr.next();
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93 osr.setNext(null);
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94 osrStart.setNext(next);
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95 graph.setStart(osrStart);
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96 osrStart.setStateAfter(osrState);
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97
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98 for (int i = 0; i < osrState.localsSize(); i++) {
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99 ValueNode value = osrState.localAt(i);
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100 if (value != null) {
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101 ProxyNode proxy = (ProxyNode) value;
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102 /*
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103 * we need to drop the stamp and go back to the kind since the types we see during
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104 * OSR may be too precise (if a branch was not parsed for example).
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105 */
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106 proxy.replaceAndDelete(graph.unique(new OSRLocalNode(i, StampFactory.forKind(proxy.kind()))));
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107 }
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108 }
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109
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110 GraphUtil.killCFG(start);
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111
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112 Debug.dump(graph, "OnStackReplacement result");
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113 new DeadCodeEliminationPhase().apply(graph);
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114 }
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115 }