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annotate graal/GraalCompiler/src/com/sun/c1x/ir/NullCheck.java @ 2509:16b9a8b5ad39

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Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:50:44 +0200
parents graal/Compiler/src/com/sun/c1x/ir/NullCheck.java@9ec15d6914ca
children 0f9eeb15e636
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 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 }