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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/ArrayLengthNode.java @ 11815:43bc62c78f77

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attempt to canonicalize array length access when lowering array load|store operations
author Doug Simon <doug.simon@oracle.com>
date Thu, 26 Sep 2013 22:45:25 +0200
parents 976ebd1973d1
children 9a747d8e0d0f
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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 com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.nodes.*;
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27 import com.oracle.graal.nodes.spi.*;
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28 import com.oracle.graal.nodes.type.*;
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29
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30 /**
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31 * The {@code ArrayLength} instruction gets the length of an array.
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32 */
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33 public final class ArrayLengthNode extends FixedWithNextNode implements Canonicalizable, Lowerable, Virtualizable {
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34
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35 @Input private ValueNode array;
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36
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37 public ValueNode array() {
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38 return array;
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39 }
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40
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41 public ArrayLengthNode(ValueNode array) {
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42 super(StampFactory.positiveInt());
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43 this.array = array;
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44 }
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45
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46 @Override
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47 public ValueNode canonical(CanonicalizerTool tool) {
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48 ValueNode length = readArrayLength(array(), tool.runtime());
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49 if (length != null) {
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50 return length;
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51 }
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52 return this;
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53 }
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54
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55 /**
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56 * Gets the length of an array if possible.
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57 *
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58 * @param array an array
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59 * @return a node representing the length of {@code array} or null if it is not available
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60 */
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61 public static ValueNode readArrayLength(ValueNode array, MetaAccessProvider runtime) {
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62 if (array instanceof ArrayLengthProvider) {
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63 ValueNode length = ((ArrayLengthProvider) array).length();
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64 if (length != null) {
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65 return length;
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66 }
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67 }
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68 if (runtime != null && array.isConstant() && !array.isNullConstant()) {
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69 Constant constantValue = array.asConstant();
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70 if (constantValue != null && constantValue.isNonNull()) {
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71 Integer constantLength = runtime.lookupArrayLength(constantValue);
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72 if (constantLength != null) {
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73 return ConstantNode.forInt(constantLength, array.graph());
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74 }
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75 }
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76 }
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77 return null;
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78 }
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79
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80 @Override
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81 public void lower(LoweringTool tool) {
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82 tool.getRuntime().lower(this, tool);
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83 }
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84
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85 @NodeIntrinsic
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86 public static native int arrayLength(Object array);
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87
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88 @Override
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89 public void virtualize(VirtualizerTool tool) {
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90 State state = tool.getObjectState(array());
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91 if (state != null) {
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92 assert state.getVirtualObject().type().isArray();
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93 tool.replaceWithValue(ConstantNode.forInt(state.getVirtualObject().entryCount(), graph()));
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94 }
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95 }
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96 }