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annotate graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/ir/ArrayLength.java @ 2941:cd4176d590e7

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Towards lowering phase.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Thu, 09 Jun 2011 17:28:56 +0200
parents e7ba2bad98fb
children 4b63eb1197ca
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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.max.graal.compiler.ir;
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24
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25 import com.oracle.max.graal.compiler.debug.*;
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26 import com.oracle.max.graal.compiler.graph.*;
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27 import com.oracle.max.graal.compiler.phases.CanonicalizerPhase.*;
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28 import com.oracle.max.graal.compiler.util.*;
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29 import com.oracle.max.graal.graph.*;
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30 import com.sun.cri.bytecode.*;
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31 import com.sun.cri.ci.*;
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32 import com.sun.cri.ri.*;
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33
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34 /**
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35 * The {@code ArrayLength} instruction gets the length of an array.
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36 */
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37 public final class ArrayLength extends FloatingNode {
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38 private static final ArrayLengthCanonicalizerOp CANONICALIZER = new ArrayLengthCanonicalizerOp();
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39
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40 private static final int INPUT_COUNT = 1;
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41 private static final int INPUT_ARRAY = 0;
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42
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43 private static final int SUCCESSOR_COUNT = 0;
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44
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45 @Override
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46 protected int inputCount() {
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47 return super.inputCount() + INPUT_COUNT;
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48 }
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49
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50 @Override
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51 protected int successorCount() {
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52 return super.successorCount() + SUCCESSOR_COUNT;
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53 }
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54
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55 /**
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56 * The instruction that produces the array object.
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57 */
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58 public Value array() {
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59 return (Value) inputs().get(super.inputCount() + INPUT_ARRAY);
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60 }
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61
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62 public Value setArray(Value n) {
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63 return (Value) inputs().set(super.inputCount() + INPUT_ARRAY, n);
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64 }
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65
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66 /**
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67 * Constructs a new ArrayLength instruction.
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68 * @param array the instruction producing the array
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69 * @param newFrameState the state after executing this instruction
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70 */
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71 public ArrayLength(Value array, Graph graph) {
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72 super(CiKind.Int, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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73 setArray(array);
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74 }
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75
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76 @Override
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77 public void accept(ValueVisitor v) {
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78 v.visitArrayLength(this);
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79 }
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80
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81 @Override
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82 public int valueNumber() {
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83 return Util.hash1(Bytecodes.ARRAYLENGTH, array());
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84 }
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85
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86 @Override
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87 public boolean valueEqual(Node i) {
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88 if (i instanceof ArrayLength) {
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89 ArrayLength o = (ArrayLength) i;
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90 return array() == o.array();
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91 }
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92 return false;
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93 }
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94
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95 @Override
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96 public void print(LogStream out) {
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97 out.print(array()).print(".length");
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98 }
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99
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100 @Override
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101 public Node copy(Graph into) {
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102 ArrayLength x = new ArrayLength(null, into);
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103 return x;
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104 }
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105
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106 @SuppressWarnings("unchecked")
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107 @Override
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108 public <T extends Op> T lookup(Class<T> clazz) {
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109 if (clazz == CanonicalizerOp.class) {
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110 return (T) CANONICALIZER;
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111 }
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112 return super.lookup(clazz);
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113 }
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114
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115 private static class ArrayLengthCanonicalizerOp implements CanonicalizerOp {
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116 @Override
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117 public Node canonical(Node node) {
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118 ArrayLength arrayLength = (ArrayLength) node;
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119 Value array = arrayLength.array();
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120 if (array instanceof NewArray) {
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121 Value length = ((NewArray) array).length();
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122 if (array instanceof NewMultiArray) {
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123 length = ((NewMultiArray) array).dimension(0);
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124 }
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125 assert length != null;
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126 return length;
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127 }
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128 CiConstant constantValue = null;
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129 if (array.isConstant()) {
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130 constantValue = array.asConstant();
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131 }
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132 if (constantValue != null && constantValue.isNonNull()) {
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133 Graph graph = node.graph();
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Gilles Duboscq <gilles.duboscq@oracle.com>
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134 if (graph instanceof CompilerGraph) {
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135 RiRuntime runtime = ((CompilerGraph) graph).getCompilation().runtime;
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136 return Constant.forInt(runtime.getArrayLength(constantValue), graph);
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137 }
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138 }
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Gilles Duboscq <gilles.duboscq@oracle.com>
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139 return arrayLength;
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140 }
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Gilles Duboscq <gilles.duboscq@oracle.com>
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141 }
2507
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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142 }