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annotate graal/Compiler/src/com/sun/c1x/ir/AccessIndexed.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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2507
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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 static com.sun.c1x.ir.Value.Flag.*;
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26
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27 import com.sun.c1x.value.*;
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28 import com.sun.cri.ci.*;
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29
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30 /**
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31 * The {@code AccessIndexed} class is the base class of instructions that read or write
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32 * elements of an array.
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33 *
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34 * @author Ben L. Titzer
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35 */
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36 public abstract class AccessIndexed extends AccessArray {
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37
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38 private Value index;
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39 private Value length;
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40 private final CiKind elementType;
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41
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42 /**
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43 * Create an new AccessIndexed instruction.
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44 * @param kind the result kind of the access
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45 * @param array the instruction producing the array
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46 * @param index the instruction producing the index
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47 * @param length the instruction producing the length (used in bounds check elimination?)
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48 * @param elementType the type of the elements of the array
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49 * @param stateBefore the state before executing this instruction
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50 */
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51 AccessIndexed(CiKind kind, Value array, Value index, Value length, CiKind elementType, FrameState stateBefore) {
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52 super(kind, array, stateBefore);
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53 this.index = index;
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54 this.length = length;
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55 this.elementType = elementType;
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56 }
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57
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58 /**
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59 * Gets the instruction producing the index into the array.
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60 * @return the index
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61 */
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62 public Value index() {
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63 return index;
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64 }
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65
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66 /**
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67 * Gets the instruction that produces the length of the array.
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68 * @return the length
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69 */
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70 public Value length() {
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71 return length;
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72 }
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73
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74 /**
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75 * Gets the element type of the array.
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76 * @return the element type
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77 */
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78 public CiKind elementKind() {
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79 return elementType;
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80 }
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81
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82 /**
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83 * Checks whether this instruction needs a bounds check.
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84 * @return {@code true} if a bounds check is needed
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85 */
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86 public boolean needsBoundsCheck() {
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87 return !checkFlag(NoBoundsCheck);
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88 }
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89
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90 public void eliminateBoundsCheck() {
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91 clearRuntimeCheck(NoBoundsCheck);
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92 }
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93
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94 /**
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95 * Checks whether this instruction can cause a trap.
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96 * @return {@code true} if this instruction can cause a trap
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97 */
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98 @Override
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99 public boolean canTrap() {
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100 return needsNullCheck() || needsBoundsCheck();
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101 }
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102
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103 @Override
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104 public void inputValuesDo(ValueClosure closure) {
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105 super.inputValuesDo(closure);
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106 index = closure.apply(index);
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107 if (length != null) {
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108 length = closure.apply(length);
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109 }
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110 }
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111 }