Mercurial > hg > graal-compiler
annotate graal/GraalCompiler/src/com/sun/c1x/ir/NullCheck.java @ 2509:16b9a8b5ad39
Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:50:44 +0200 |
parents | graal/Compiler/src/com/sun/c1x/ir/NullCheck.java@9ec15d6914ca |
children | 0f9eeb15e636 |
rev | line source |
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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.sun.c1x.debug.*; |
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26 import com.sun.c1x.util.*; |
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27 import com.sun.c1x.value.*; |
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28 import com.sun.cri.bytecode.*; |
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29 import com.sun.cri.ri.*; |
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30 |
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31 /** |
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32 * The {@code NullCheck} class represents an explicit null check instruction. |
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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 final class NullCheck extends StateSplit { |
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37 |
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38 Value object; |
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39 |
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40 /** |
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41 * Constructs a new NullCheck instruction. |
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42 * @param obj the instruction producing the object to check against null |
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43 * @param stateBefore the state before executing the null check |
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44 */ |
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45 public NullCheck(Value obj, FrameState stateBefore) { |
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46 super(obj.kind, stateBefore); |
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47 this.object = obj; |
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48 setFlag(Flag.NonNull); |
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49 if (object.isNonNull()) { |
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50 eliminateNullCheck(); |
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51 } |
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52 } |
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53 |
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54 /** |
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55 * Gets the instruction that produces the object tested against null. |
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56 * @return the instruction producing the object |
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57 */ |
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58 public Value object() { |
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59 return object; |
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60 } |
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61 |
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62 /** |
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63 * Checks whether this instruction can cause a trap. |
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64 * @return {@code true} if this instruction can cause a trap |
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65 */ |
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66 @Override |
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67 public boolean canTrap() { |
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68 return needsNullCheck(); |
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69 } |
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70 |
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71 @Override |
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72 public void inputValuesDo(ValueClosure closure) { |
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73 object = closure.apply(object); |
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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.visitNullCheck(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.IFNONNULL, object); |
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84 } |
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85 |
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86 @Override |
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87 public boolean valueEqual(Instruction i) { |
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88 if (i instanceof NullCheck) { |
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89 NullCheck o = (NullCheck) i; |
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90 return object == o.object; |
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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 RiType declaredType() { |
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97 // null check does not alter the type of the object |
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98 return object.declaredType(); |
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99 } |
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100 |
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101 @Override |
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102 public RiType exactType() { |
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103 // null check does not alter the type of the object |
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104 return object.exactType(); |
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105 } |
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106 |
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107 @Override |
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108 public void runtimeCheckCleared() { |
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109 clearState(); |
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110 } |
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111 |
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112 @Override |
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113 public void print(LogStream out) { |
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114 out.print("null_check(").print(object()).print(')'); |
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115 if (!canTrap()) { |
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116 out.print(" (eliminated)"); |
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117 } |
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118 } |
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119 } |