Mercurial > hg > graal-compiler
annotate graal/GraalCompiler/src/com/sun/c1x/ir/NullCheck.java @ 2741:a3cd5eb68837
more GraphBuilder cleanup, moved mergeOrClone to GraphBuilder
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 20 May 2011 11:11:33 +0200 |
parents | 440ceca8e3d7 |
children | c3f64b66fc78 |
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.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.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 public final class NullCheck extends Instruction { |
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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_OBJECT = 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 object tested against null. |
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53 */ |
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54 public Value object() { |
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55 return (Value) inputs().get(super.inputCount() + INPUT_OBJECT); |
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56 } |
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57 |
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58 public Value setObject(Value n) { |
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59 return (Value) inputs().set(super.inputCount() + INPUT_OBJECT, n); |
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60 } |
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61 |
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62 /** |
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63 * Constructs a new NullCheck instruction. |
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64 * @param object the instruction producing the object to check against null |
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65 * @param stateBefore the state before executing the null check |
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66 * @param graph |
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67 */ |
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68 public NullCheck(Value object, Graph graph) { |
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69 super(object.kind, INPUT_COUNT, SUCCESSOR_COUNT, graph); |
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70 setFlag(Flag.NonNull); |
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71 setObject(object); |
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72 } |
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73 |
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74 @Override |
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75 public void accept(ValueVisitor v) { |
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76 v.visitNullCheck(this); |
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77 } |
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78 |
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79 @Override |
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80 public int valueNumber() { |
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81 return Util.hash1(Bytecodes.IFNONNULL, object()); |
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82 } |
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83 |
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84 @Override |
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85 public boolean valueEqual(Instruction i) { |
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86 if (i instanceof NullCheck) { |
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87 NullCheck o = (NullCheck) i; |
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88 return object() == o.object(); |
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89 } |
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90 return false; |
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91 } |
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92 |
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93 @Override |
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94 public RiType declaredType() { |
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95 // null check does not alter the type of the object |
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96 return object().declaredType(); |
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97 } |
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98 |
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99 @Override |
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100 public RiType exactType() { |
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101 // null check does not alter the type of the object |
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102 return object().exactType(); |
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103 } |
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104 |
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105 @Override |
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106 public void print(LogStream out) { |
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107 out.print("null_check(").print(object()).print(')'); |
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108 } |
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109 } |