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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/NewArrayNode.java @ 5885:d172b68e7762

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allow array length canonicalization on InitializeArrayNode
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 17 Aug 2012 14:12:39 +0200
parents d241f8b2e6f9
children fd8832ae511d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2009, 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.nodes.java;
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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.api.meta.*;
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28 import com.oracle.graal.graph.*;
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29 import com.oracle.graal.nodes.*;
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30 import com.oracle.graal.nodes.calc.*;
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31 import com.oracle.graal.nodes.spi.*;
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32 import com.oracle.graal.nodes.spi.types.*;
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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
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36 /**
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37 * The {@code NewArrayNode} class is the base of all instructions that allocate arrays.
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38 */
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39 public abstract class NewArrayNode extends FixedWithNextNode implements Lowerable, EscapeAnalyzable, TypeFeedbackProvider, ArrayLengthProvider {
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40
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41 @Input private ValueNode length;
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42 private final ResolvedJavaType elementType;
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43
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44 public static final int MaximumEscapeAnalysisArrayLength = 32;
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45
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46 @Override
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47 public ValueNode length() {
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48 return length;
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49 }
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50
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51 /**
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52 * Constructs a new NewArrayNode.
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53 * @param length the node that produces the length for this allocation
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54 */
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55 protected NewArrayNode(ResolvedJavaType elementType, ValueNode length) {
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56 super(StampFactory.exactNonNull(elementType.arrayOf()));
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57 this.length = length;
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58 this.elementType = elementType;
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59 }
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60
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61 /**
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62 * The list of node which produce input for this instruction.
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63 */
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64 public ValueNode dimension(int index) {
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65 assert index == 0;
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66 return length();
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67 }
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68
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69 /**
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70 * Gets the element type of the array.
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71 * @return the element type of the array
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72 */
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73 public ResolvedJavaType elementType() {
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74 return elementType;
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75 }
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76
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77 /**
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78 * The rank of the array allocated by this node, i.e. how many array dimensions.
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79 */
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80 public int dimensionCount() {
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81 return 1;
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82 }
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83
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84 @Override
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85 public void typeFeedback(TypeFeedbackTool tool) {
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86 assert length.kind() == Kind.Int;
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87 tool.addScalar(length).constantBound(Condition.GE, Constant.INT_0);
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88 }
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89
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90 public EscapeOp getEscapeOp() {
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91 return ESCAPE;
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92 }
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93
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94 @Override
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95 public void lower(LoweringTool tool) {
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96 tool.getRuntime().lower(this, tool);
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97 }
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98
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99 private static final EscapeOp ESCAPE = new EscapeOp() {
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100
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101 @Override
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102 public boolean canAnalyze(Node node) {
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103 NewArrayNode x = (NewArrayNode) node;
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104 Constant length = x.dimension(0).asConstant();
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105 return length != null && length.asInt() >= 0 && length.asInt() < MaximumEscapeAnalysisArrayLength;
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106 }
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107
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108 @Override
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109 public EscapeField[] fields(Node node) {
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110 NewArrayNode x = (NewArrayNode) node;
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111 int length = x.dimension(0).asConstant().asInt();
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112 EscapeField[] fields = new EscapeField[length];
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113 for (int i = 0; i < length; i++) {
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114 Integer representation = i;
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115 fields[i] = new EscapeField(Integer.toString(i), representation, ((NewArrayNode) node).elementType());
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116 }
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117 return fields;
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118 }
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119
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120 @Override
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121 public void beforeUpdate(Node node, Node usage) {
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122 if (usage instanceof ArrayLengthNode) {
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123 ArrayLengthNode x = (ArrayLengthNode) usage;
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124 StructuredGraph graph = (StructuredGraph) node.graph();
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125 x.replaceAtUsages(((NewArrayNode) node).dimension(0));
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126 graph.removeFixed(x);
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127 } else {
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128 super.beforeUpdate(node, usage);
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129 }
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130 }
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131
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132 @Override
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133 public int updateState(Node node, Node current, Map<Object, Integer> fieldIndex, ValueNode[] fieldState) {
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134 if (current instanceof AccessIndexedNode) {
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135 AccessIndexedNode x = (AccessIndexedNode) current;
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Gilles Duboscq <duboscq@ssw.jku.at>
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136 if (GraphUtil.unProxify(x.array()) == node) {
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137 int index = ((AccessIndexedNode) current).index().asConstant().asInt();
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ac2970c9ebdf Small cleanups and add snapshotTo method to node iterables
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parents: 5646
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138 StructuredGraph graph = (StructuredGraph) x.graph();
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139 if (current instanceof LoadIndexedNode) {
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140 x.replaceAtUsages(fieldState[index]);
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141 graph.removeFixed(x);
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142 } else if (current instanceof StoreIndexedNode) {
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143 fieldState[index] = ((StoreIndexedNode) x).value();
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parents: 5646
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144 graph.removeFixed(x);
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145 return index;
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146 }
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147 }
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148 }
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149 return -1;
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150 }
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151 };
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152 }