Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/AccessField.java @ 2540:3fc322165071
More flags clean up.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 20:27:43 +0200 |
parents | fa3bda50cbfd |
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 java.lang.reflect.*; |
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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 import com.sun.cri.ri.*; |
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30 |
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31 /** |
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32 * The base class of all instructions that access fields. |
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33 */ |
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34 public abstract class AccessField extends StateSplit { |
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35 |
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36 private Value object; |
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37 protected final RiField field; |
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38 |
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39 /** |
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40 * Constructs a new access field object. |
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41 * @param kind the result kind of the access |
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42 * @param object the instruction producing the receiver object |
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43 * @param field the compiler interface representation of the field |
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44 * @param isStatic indicates if the field is static |
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45 * @param stateBefore the state before the field access |
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46 * @param isLoaded indicates if the class is loaded |
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47 */ |
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48 public AccessField(CiKind kind, Value object, RiField field, FrameState stateBefore) { |
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49 super(kind, stateBefore); |
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50 this.object = object; |
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51 this.field = field; |
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52 if (field.isResolved() && object.isNonNull()) { |
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53 eliminateNullCheck(); |
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54 } |
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55 assert object != null : "every field access must reference some object"; |
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56 } |
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57 |
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58 /** |
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59 * Gets the instruction that produces the receiver object of this field access |
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60 * (for instance field accesses). |
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61 * @return the instruction that produces the receiver object |
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62 */ |
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63 public Value object() { |
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64 return object; |
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65 } |
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66 |
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67 /** |
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68 * Gets the compiler interface field for this field access. |
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69 * @return the compiler interface field for this field access |
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70 */ |
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71 public RiField field() { |
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72 return field; |
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73 } |
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74 |
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75 /** |
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76 * Checks whether this field access is an access to a static field. |
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77 * @return {@code true} if this field access is to a static field |
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78 */ |
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79 public boolean isStatic() { |
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80 return Modifier.isStatic(field.accessFlags()); |
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81 } |
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82 |
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83 /** |
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84 * Checks whether the class of the field of this access is loaded. |
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85 * @return {@code true} if the class is loaded |
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86 */ |
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87 public boolean isLoaded() { |
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88 return field.isResolved(); |
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89 } |
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90 |
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91 /** |
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92 * Checks whether this field is declared volatile. |
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93 * @return {@code true} if the field is resolved and declared volatile |
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94 */ |
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95 public boolean isVolatile() { |
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96 return isLoaded() && Modifier.isVolatile(field.accessFlags()); |
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97 } |
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98 |
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99 @Override |
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100 public void runtimeCheckCleared() { |
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101 if (isLoaded()) { |
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102 clearState(); |
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103 } |
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104 } |
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105 |
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106 /** |
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107 * Checks whether this field access may cause a trap or an exception, which |
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108 * is if it either requires a null check or needs patching. |
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109 * @return {@code true} if this field access can cause a trap |
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110 */ |
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111 @Override |
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112 public boolean canTrap() { |
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113 return !isLoaded() || needsNullCheck(); |
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114 } |
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115 |
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116 @Override |
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117 public void inputValuesDo(ValueClosure closure) { |
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118 object = closure.apply(object); |
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119 } |
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120 } |