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annotate graal/GraalCompiler/src/com/sun/c1x/ir/ArrayLength.java @ 2827:bd17ac598c6e

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Graph cloning, initial version (not completely working)
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 30 May 2011 18:46:57 +0200
parents d27bdbec3d67
children caf55daa41dc
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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.sun.c1x.ir;
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24
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25 import com.oracle.graal.graph.*;
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26 import com.sun.c1x.debug.*;
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27 import com.sun.c1x.util.*;
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28 import com.sun.cri.bytecode.*;
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29 import com.sun.cri.ci.*;
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30
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31 /**
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32 * The {@code ArrayLength} instruction gets the length of an array.
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33 */
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34 public final class ArrayLength extends Value {
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35
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36 private static final int INPUT_COUNT = 1;
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37 private static final int INPUT_ARRAY = 0;
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38
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39 private static final int SUCCESSOR_COUNT = 0;
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40
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41 @Override
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42 protected int inputCount() {
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43 return super.inputCount() + INPUT_COUNT;
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44 }
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45
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46 @Override
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47 protected int successorCount() {
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48 return super.successorCount() + SUCCESSOR_COUNT;
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49 }
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50
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51 /**
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52 * The instruction that produces the array object.
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53 */
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54 public Value array() {
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55 return (Value) inputs().get(super.inputCount() + INPUT_ARRAY);
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56 }
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57
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58 public Value setArray(Value n) {
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59 return (Value) inputs().set(super.inputCount() + INPUT_ARRAY, n);
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60 }
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61
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62 /**
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63 * Constructs a new ArrayLength instruction.
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64 * @param array the instruction producing the array
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65 * @param newFrameState the state after executing this instruction
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66 */
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67 public ArrayLength(Value array, Graph graph) {
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68 super(CiKind.Int, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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69 setArray(array);
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70 }
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71
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72 @Override
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73 public void accept(ValueVisitor v) {
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74 v.visitArrayLength(this);
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75 }
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76
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77 @Override
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78 public int valueNumber() {
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79 return Util.hash1(Bytecodes.ARRAYLENGTH, array());
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80 }
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81
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82 @Override
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83 public boolean valueEqual(Node i) {
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84 if (i instanceof ArrayLength) {
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85 ArrayLength o = (ArrayLength) i;
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86 return array() == o.array();
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87 }
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88 return false;
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89 }
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90
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91 @Override
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92 public void print(LogStream out) {
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93 out.print(array()).print(".length");
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94 }
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95
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96 @Override
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97 public Node copy(Graph into) {
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98 ArrayLength x = new ArrayLength(null, into);
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99 x.setNonNull(isNonNull());
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100 return x;
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101 }
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102 }