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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/phases/OnStackReplacementPhase.java @ 22992:dd3f7ad81b73

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Split com.oracle.graal.loop in 2 parts, Make LoopPolicies extensible Moved the phases out of com.oracle.graal.loop into com.oracle.graal.loop.phases. Made LoopPolicies an interface with a default implementation. Pass a LoopPolicies instance to the different loop phases constructors. Add abstract classes for loop phases to hold onto the loop polcies.
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Fri, 13 Nov 2015 14:12:43 +0100
parents 3e8357b49024
children 1c5c04b9aaf1
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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 static com.oracle.graal.phases.common.DeadCodeEliminationPhase.Optionality.Required;
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26 import jdk.vm.ci.code.BailoutException;
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27 import jdk.vm.ci.common.JVMCIError;
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28 import jdk.vm.ci.runtime.JVMCICompiler;
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29
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30 import com.oracle.graal.debug.Debug;
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31 import com.oracle.graal.graph.Node;
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32 import com.oracle.graal.graph.iterators.NodeIterable;
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33 import com.oracle.graal.loop.LoopEx;
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34 import com.oracle.graal.loop.LoopsData;
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35 import com.oracle.graal.loop.phases.LoopTransformations;
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36 import com.oracle.graal.nodeinfo.InputType;
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37 import com.oracle.graal.nodeinfo.Verbosity;
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38 import com.oracle.graal.nodes.AbstractBeginNode;
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39 import com.oracle.graal.nodes.EntryMarkerNode;
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40 import com.oracle.graal.nodes.FixedNode;
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41 import com.oracle.graal.nodes.FrameState;
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42 import com.oracle.graal.nodes.ProxyNode;
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43 import com.oracle.graal.nodes.StartNode;
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44 import com.oracle.graal.nodes.StructuredGraph;
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45 import com.oracle.graal.nodes.ValueNode;
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46 import com.oracle.graal.nodes.extended.OSRLocalNode;
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47 import com.oracle.graal.nodes.extended.OSRStartNode;
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48 import com.oracle.graal.nodes.util.GraphUtil;
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49 import com.oracle.graal.phases.Phase;
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50 import com.oracle.graal.phases.common.DeadCodeEliminationPhase;
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51
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52 public class OnStackReplacementPhase extends Phase {
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53
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54 @Override
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55 protected void run(StructuredGraph graph) {
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56 if (graph.getEntryBCI() == JVMCICompiler.INVOCATION_ENTRY_BCI) {
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57 // This happens during inlining in a OSR method, because the same phase plan will be
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58 // used.
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59 return;
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60 }
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61 Debug.dump(graph, "OnStackReplacement initial");
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62 EntryMarkerNode osr;
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63 do {
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64 NodeIterable<EntryMarkerNode> osrNodes = graph.getNodes(EntryMarkerNode.TYPE);
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65 osr = osrNodes.first();
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66 if (osr == null) {
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67 throw new BailoutException("No OnStackReplacementNode generated");
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68 }
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69 if (osrNodes.count() > 1) {
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70 throw new JVMCIError("Multiple OnStackReplacementNodes generated");
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71 }
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72 if (osr.stateAfter().locksSize() != 0) {
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73 throw new BailoutException("OSR with locks not supported");
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74 }
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75 if (osr.stateAfter().stackSize() != 0) {
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76 throw new BailoutException("OSR with stack entries not supported: %s", osr.stateAfter().toString(Verbosity.Debugger));
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77 }
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78 LoopEx osrLoop = null;
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79 LoopsData loops = new LoopsData(graph);
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80 for (LoopEx loop : loops.loops()) {
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81 if (loop.inside().contains(osr)) {
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82 osrLoop = loop;
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83 break;
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84 }
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85 }
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86 if (osrLoop == null) {
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87 break;
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88 }
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89
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90 LoopTransformations.peel(osrLoop);
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91 osr.replaceAtUsages(InputType.Guard, AbstractBeginNode.prevBegin((FixedNode) osr.predecessor()));
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92 for (Node usage : osr.usages().snapshot()) {
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93 ProxyNode proxy = (ProxyNode) usage;
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94 proxy.replaceAndDelete(proxy.value());
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95 }
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96 GraphUtil.removeFixedWithUnusedInputs(osr);
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97 Debug.dump(graph, "OnStackReplacement loop peeling result");
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98 } while (true);
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99
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100 FrameState osrState = osr.stateAfter();
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101 osr.setStateAfter(null);
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102 OSRStartNode osrStart = graph.add(new OSRStartNode());
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103 StartNode start = graph.start();
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104 FixedNode next = osr.next();
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105 osr.setNext(null);
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106 osrStart.setNext(next);
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107 graph.setStart(osrStart);
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108 osrStart.setStateAfter(osrState);
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109
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110 for (int i = 0; i < osrState.localsSize(); i++) {
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111 ValueNode value = osrState.localAt(i);
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112 if (value instanceof ProxyNode) {
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113 ProxyNode proxy = (ProxyNode) value;
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114 /*
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115 * we need to drop the stamp since the types we see during OSR may be too precise
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116 * (if a branch was not parsed for example).
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117 */
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118 proxy.replaceAndDelete(graph.unique(new OSRLocalNode(i, proxy.stamp().unrestricted())));
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119 } else {
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120 assert value == null || value instanceof OSRLocalNode;
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121 }
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122 }
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123 osr.replaceAtUsages(InputType.Guard, osrStart);
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124 assert osr.usages().isEmpty();
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125
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8f854c4deabf Delay lowering of the platform specific OSR entry
Gilles Duboscq <duboscq@ssw.jku.at>
parents: 8524
diff changeset
126 GraphUtil.killCFG(start);
6677
3dddb311395f hotspot infrastructure for OnStackReplacement
Lukas Stadler <lukas.stadler@jku.at>
parents:
diff changeset
127
3dddb311395f hotspot infrastructure for OnStackReplacement
Lukas Stadler <lukas.stadler@jku.at>
parents:
diff changeset
128 Debug.dump(graph, "OnStackReplacement result");
17114
8ca5e41dde86 DeadCodeElimination is not optional for OnStackReplacementPhase
Doug Simon <doug.simon@oracle.com>
parents: 17094
diff changeset
129 new DeadCodeEliminationPhase(Required).apply(graph);
6677
3dddb311395f hotspot infrastructure for OnStackReplacement
Lukas Stadler <lukas.stadler@jku.at>
parents:
diff changeset
130 }
3dddb311395f hotspot infrastructure for OnStackReplacement
Lukas Stadler <lukas.stadler@jku.at>
parents:
diff changeset
131 }