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annotate graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/BoxingEliminationPhase.java @ 7053:014727292ae0

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removed more usages of ResolvedJavaType.toJava()
author Doug Simon <doug.simon@oracle.com>
date Tue, 27 Nov 2012 18:03:49 +0100
parents ee651c726397
children 585fc9f79ebc
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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.phases.common;
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24
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25 import static com.oracle.graal.graph.iterators.NodePredicates.*;
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26
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27 import java.util.*;
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28
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29 import com.oracle.graal.api.meta.*;
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30 import com.oracle.graal.graph.*;
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31 import com.oracle.graal.graph.iterators.*;
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32 import com.oracle.graal.nodes.*;
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33 import com.oracle.graal.nodes.extended.*;
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34 import com.oracle.graal.nodes.type.*;
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35 import com.oracle.graal.nodes.virtual.*;
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36 import com.oracle.graal.phases.*;
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37
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38 public class BoxingEliminationPhase extends Phase {
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39
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40 private int virtualIds = Integer.MIN_VALUE;
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41
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42 @Override
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43 protected void run(StructuredGraph graph) {
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44 if (graph.getNodes(UnboxNode.class).isNotEmpty()) {
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45
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46 Map<PhiNode, PhiNode> phiReplacements = new HashMap<>();
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47 for (UnboxNode unboxNode : graph.getNodes(UnboxNode.class)) {
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48 tryEliminate(graph, unboxNode, phiReplacements);
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49 }
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50
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51 new DeadCodeEliminationPhase().apply(graph);
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52
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53 for (BoxNode boxNode : graph.getNodes(BoxNode.class)) {
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54 tryEliminate(boxNode);
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55 }
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56 }
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57 }
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58
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59 private void tryEliminate(StructuredGraph graph, UnboxNode unboxNode, Map<PhiNode, PhiNode> phiReplacements) {
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60 ValueNode unboxedValue = unboxedValue(unboxNode.source(), unboxNode.destinationKind(), phiReplacements);
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61 if (unboxedValue != null) {
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62 assert unboxedValue.kind() == unboxNode.kind();
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63 unboxNode.replaceAtUsages(unboxedValue);
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64 graph.removeFixed(unboxNode);
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65 }
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66 }
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67
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68 private PhiNode getReplacementPhi(PhiNode phiNode, Kind kind, Map<PhiNode, PhiNode> phiReplacements) {
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69 if (!phiReplacements.containsKey(phiNode)) {
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70 PhiNode result = null;
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71 ObjectStamp stamp = phiNode.objectStamp();
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72 if (stamp.nonNull() && stamp.isExactType()) {
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73 ResolvedJavaType type = stamp.type();
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74 if (type != null && type.isClass(kind.toBoxedJavaClass())) {
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75 StructuredGraph graph = (StructuredGraph) phiNode.graph();
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76 result = graph.add(new PhiNode(kind, phiNode.merge()));
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77 phiReplacements.put(phiNode, result);
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78 virtualizeUsages(phiNode, result, type);
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79 int i = 0;
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80 for (ValueNode n : phiNode.values()) {
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81 ValueNode unboxedValue = unboxedValue(n, kind, phiReplacements);
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82 if (unboxedValue != null) {
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83 assert unboxedValue.kind() == kind;
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84 result.addInput(unboxedValue);
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85 } else {
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86 UnboxNode unboxNode = graph.add(new UnboxNode(kind, n));
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87 FixedNode pred = phiNode.merge().phiPredecessorAt(i);
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88 graph.addBeforeFixed(pred, unboxNode);
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89 result.addInput(unboxNode);
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90 }
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91 ++i;
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92 }
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93 }
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94 }
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95 }
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96 return phiReplacements.get(phiNode);
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97 }
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98
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99 private ValueNode unboxedValue(ValueNode n, Kind kind, Map<PhiNode, PhiNode> phiReplacements) {
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100 if (n instanceof BoxNode) {
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101 BoxNode boxNode = (BoxNode) n;
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102 return boxNode.source();
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103 } else if (n instanceof PhiNode) {
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104 PhiNode phiNode = (PhiNode) n;
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105 return getReplacementPhi(phiNode, kind, phiReplacements);
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106 } else {
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107 return null;
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108 }
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109 }
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110
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111 private void tryEliminate(BoxNode boxNode) {
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112
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113 assert boxNode.objectStamp().isExactType();
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114 virtualizeUsages(boxNode, boxNode.source(), boxNode.objectStamp().type());
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115
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116 if (boxNode.usages().filter(isNotA(VirtualState.class)).isNotEmpty()) {
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117 // Elimination failed, because boxing object escapes.
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118 return;
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119 }
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120
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121 FrameState stateAfter = boxNode.stateAfter();
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122 boxNode.setStateAfter(null);
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123 stateAfter.safeDelete();
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124
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125 ((StructuredGraph) boxNode.graph()).removeFixed(boxNode);
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126 }
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127
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128 private void virtualizeUsages(ValueNode boxNode, ValueNode replacement, ResolvedJavaType exactType) {
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129 ValueNode virtualValueNode = null;
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130 VirtualObjectNode virtualObjectNode = null;
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131 for (Node n : boxNode.usages().filter(NodePredicates.isA(VirtualState.class)).snapshot()) {
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132 if (virtualValueNode == null) {
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133 virtualObjectNode = n.graph().unique(new BoxedVirtualObjectNode(virtualIds++, exactType, replacement));
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134 }
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135 n.replaceFirstInput(boxNode, virtualObjectNode);
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136 }
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137 }
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138 }