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annotate graal/GraalCompiler/src/com/sun/c1x/ir/NullCheck.java @ 2600:f1bc67c2d453

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new node layout: TypeCheck, RegisterFinalizer, Invoke, NewArray, NullCheck
author Lukas Stadler <lukas.stadler@jku.at>
date Thu, 05 May 2011 16:32:20 +0200
parents c58a301eb2d7
children 91d3952f7eb7
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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.c1x.value.*;
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29 import com.sun.cri.bytecode.*;
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30 import com.sun.cri.ri.*;
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31
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32 /**
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33 * The {@code NullCheck} class represents an explicit null check instruction.
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34 */
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35 public final class NullCheck extends StateSplit {
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36
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37 private static final int INPUT_COUNT = 1;
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38 private static final int INPUT_OBJECT = 0;
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39
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40 private static final int SUCCESSOR_COUNT = 0;
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41
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42 @Override
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43 protected int inputCount() {
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44 return super.inputCount() + INPUT_COUNT;
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45 }
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46
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47 @Override
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48 protected int successorCount() {
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49 return super.successorCount() + SUCCESSOR_COUNT;
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50 }
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51
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52 /**
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53 * The instruction that produces the object tested against null.
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54 */
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55 public Value object() {
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56 return (Value) inputs().get(super.inputCount() + INPUT_OBJECT);
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57 }
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58
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59 public Value setObject(Value n) {
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60 return (Value) inputs().set(super.inputCount() + INPUT_OBJECT, n);
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61 }
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62
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63 /**
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64 * Constructs a new NullCheck instruction.
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65 * @param object the instruction producing the object to check against null
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66 * @param stateBefore the state before executing the null check
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67 * @param graph
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68 */
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69 public NullCheck(Value object, FrameState stateBefore, Graph graph) {
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70 super(object.kind, stateBefore, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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71 setFlag(Flag.NonNull);
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72 setObject(object);
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73 }
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74
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75 @Override
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76 public void accept(ValueVisitor v) {
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77 v.visitNullCheck(this);
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78 }
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79
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80 @Override
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81 public int valueNumber() {
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82 return Util.hash1(Bytecodes.IFNONNULL, object());
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83 }
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84
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85 @Override
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86 public boolean valueEqual(Instruction i) {
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87 if (i instanceof NullCheck) {
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88 NullCheck o = (NullCheck) i;
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89 return object() == o.object();
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90 }
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91 return false;
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92 }
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93
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94 @Override
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95 public RiType declaredType() {
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96 // null check does not alter the type of the object
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97 return object().declaredType();
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98 }
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99
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100 @Override
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101 public RiType exactType() {
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102 // null check does not alter the type of the object
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103 return object().exactType();
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104 }
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105
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106 @Override
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107 public void print(LogStream out) {
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108 out.print("null_check(").print(object()).print(')');
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109 if (!canTrap()) {
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110 out.print(" (eliminated)");
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111 }
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112 }
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113 }