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annotate graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/phases/BoxingEliminationPhase.java @ 4331:daaee28c65c6

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Adding a few utility methods to Loop
author Gilles Duboscq <duboscq@ssw.jku.at>
date Thu, 26 Jan 2012 18:32:02 +0100
parents 4a609a685fa4
children cd2b68ef8e23
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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.max.graal.compiler.phases;
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24
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25 import java.util.*;
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27 import com.oracle.max.cri.ci.*;
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28 import com.oracle.max.cri.ri.*;
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29 import com.oracle.max.graal.graph.*;
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30 import com.oracle.max.graal.nodes.*;
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31 import com.oracle.max.graal.nodes.PhiNode.*;
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32 import com.oracle.max.graal.nodes.extended.*;
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33 import com.oracle.max.graal.nodes.virtual.*;
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34
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35 public class BoxingEliminationPhase extends Phase {
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36
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37 @Override
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38 protected void run(StructuredGraph graph) {
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39 if (graph.getNodes(UnboxNode.class).isNotEmpty()) {
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40
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41 Map<PhiNode, PhiNode> phiReplacements = new HashMap<>();
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42 for (UnboxNode unboxNode : graph.getNodes(UnboxNode.class)) {
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43 tryEliminate(graph, unboxNode, phiReplacements);
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44 }
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45
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46 new DeadCodeEliminationPhase().apply(graph);
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47
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48 for (BoxNode boxNode : graph.getNodes(BoxNode.class)) {
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49 tryEliminate(boxNode);
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50 }
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51 }
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52 }
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53
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54 private void tryEliminate(StructuredGraph graph, UnboxNode unboxNode, Map<PhiNode, PhiNode> phiReplacements) {
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55 ValueNode unboxedValue = unboxedValue(unboxNode.source(), unboxNode.destinationKind(), phiReplacements);
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56 if (unboxedValue != null) {
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57 assert unboxedValue.kind() == unboxNode.destinationKind();
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58 unboxNode.replaceAtUsages(unboxedValue);
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59 graph.removeFixed(unboxNode);
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60 }
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61 }
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62
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63 private PhiNode getReplacementPhi(PhiNode phiNode, CiKind kind, Map<PhiNode, PhiNode> phiReplacements) {
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64 if (!phiReplacements.containsKey(phiNode)) {
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65 PhiNode result = null;
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66 if (phiNode.stamp().nonNull()) {
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67 RiResolvedType exactType = phiNode.stamp().exactType();
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68 if (exactType != null && exactType.toJava() == kind.toUnboxedJavaClass()) {
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69 StructuredGraph graph = (StructuredGraph) phiNode.graph();
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70 result = graph.add(new PhiNode(kind, phiNode.merge(), PhiType.Value));
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71 phiReplacements.put(phiNode, result);
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72 virtualizeUsages(phiNode, result, exactType);
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73 int i = 0;
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74 for (ValueNode n : phiNode.values()) {
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75 ValueNode unboxedValue = unboxedValue(n, kind, phiReplacements);
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76 if (unboxedValue != null) {
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77 assert unboxedValue.kind() == kind;
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78 result.addInput(unboxedValue);
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79 } else {
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80 UnboxNode unboxNode = graph.add(new UnboxNode(kind, n));
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81 FixedNode pred = phiNode.merge().phiPredecessorAt(i);
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82 graph.addBeforeFixed(pred, unboxNode);
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83 result.addInput(unboxNode);
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84 }
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85 ++i;
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86 }
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87 }
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88 }
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89 }
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90 return phiReplacements.get(phiNode);
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91 }
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92
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93 private ValueNode unboxedValue(ValueNode n, CiKind kind, Map<PhiNode, PhiNode> phiReplacements) {
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94 if (n instanceof BoxNode) {
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95 BoxNode boxNode = (BoxNode) n;
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96 return boxNode.source();
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97 } else if (n instanceof PhiNode) {
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98 PhiNode phiNode = (PhiNode) n;
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99 return getReplacementPhi(phiNode, kind, phiReplacements);
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100 } else {
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101 return null;
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102 }
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103 }
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104
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105 private static void tryEliminate(BoxNode boxNode) {
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106
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107 virtualizeUsages(boxNode, boxNode.source(), boxNode.exactType());
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108
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109 for (Node n : boxNode.usages()) {
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110 if (!(n instanceof FrameState) && !(n instanceof VirtualObjectFieldNode)) {
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111 // Elimination failed, because boxing object escapes.
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112 return;
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113 }
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114 }
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115
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116 // TODO(ls) this seems weird: there might still be references to boxNode, yet it is deleted...
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117
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118 FrameState stateAfter = boxNode.stateAfter();
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119 boxNode.setStateAfter(null);
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120 stateAfter.safeDelete();
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121
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122 ((StructuredGraph) boxNode.graph()).removeFixed(boxNode);
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123 }
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124
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125 private static void virtualizeUsages(ValueNode boxNode, ValueNode replacement, RiResolvedType exactType) {
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126 ValueNode virtualValueNode = null;
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127 VirtualObjectNode virtualObjectNode = null;
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128 for (Node n : boxNode.usages().filter(FrameState.class).or(VirtualObjectFieldNode.class).snapshot()) {
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129 if (virtualValueNode == null) {
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130 virtualObjectNode = n.graph().unique(new BoxedVirtualObjectNode(exactType, replacement));
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131 }
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132 n.replaceFirstInput(boxNode, virtualObjectNode);
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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133 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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134 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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135 }