Mercurial > hg > graal-jvmci-8
annotate graal/Compiler/src/com/sun/c1x/ir/AccessIndexed.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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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 } |