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annotate graal/Compiler/src/com/sun/c1x/ir/AccessField.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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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.*; |
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28 import com.sun.c1x.value.*; |
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29 import com.sun.cri.ci.*; |
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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 base class of all instructions that access fields. |
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34 * |
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35 * @author Ben L. Titzer |
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36 */ |
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37 public abstract class AccessField extends StateSplit { |
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38 |
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39 private Value object; |
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40 protected final RiField field; |
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41 |
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42 /** |
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43 * Constructs a new access field object. |
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44 * @param kind the result kind of the access |
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45 * @param object the instruction producing the receiver object |
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46 * @param field the compiler interface representation of the field |
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47 * @param isStatic indicates if the field is static |
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48 * @param stateBefore the state before the field access |
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49 * @param isLoaded indicates if the class is loaded |
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50 */ |
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51 public AccessField(CiKind kind, Value object, RiField field, boolean isStatic, FrameState stateBefore, boolean isLoaded) { |
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52 super(kind, stateBefore); |
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53 this.object = object; |
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54 this.field = field; |
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55 if (!isLoaded || (C1XOptions.TestPatching && !Modifier.isVolatile(field.accessFlags()))) { |
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56 // require patching if the field is not loaded (i.e. resolved), |
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57 // or if patch testing is turned on (but not if the field is volatile) |
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58 setFlag(Flag.NeedsPatching); |
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59 } |
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60 initFlag(Flag.IsLoaded, isLoaded); |
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61 initFlag(Flag.IsStatic, isStatic); |
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62 if (isLoaded && object.isNonNull()) { |
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63 eliminateNullCheck(); |
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64 } |
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65 assert object != null : "every field access must reference some object"; |
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66 } |
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67 |
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68 /** |
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69 * Gets the instruction that produces the receiver object of this field access |
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70 * (for instance field accesses). |
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71 * @return the instruction that produces the receiver object |
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72 */ |
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73 public Value object() { |
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74 return object; |
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75 } |
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76 |
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77 /** |
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78 * Gets the compiler interface field for this field access. |
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79 * @return the compiler interface field for this field access |
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80 */ |
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81 public RiField field() { |
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82 return field; |
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83 } |
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84 |
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85 /** |
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86 * Checks whether this field access is an access to a static field. |
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87 * @return {@code true} if this field access is to a static field |
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88 */ |
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89 public boolean isStatic() { |
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90 return checkFlag(Flag.IsStatic); |
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91 } |
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92 |
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93 /** |
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94 * Checks whether the class of the field of this access is loaded. |
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95 * @return {@code true} if the class is loaded |
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96 */ |
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97 public boolean isLoaded() { |
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98 return checkFlag(Flag.IsLoaded); |
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99 } |
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100 |
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101 /** |
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102 * Checks whether this field is declared volatile. |
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103 * @return {@code true} if the field is resolved and declared volatile |
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104 */ |
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105 public boolean isVolatile() { |
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106 return isLoaded() && Modifier.isVolatile(field.accessFlags()); |
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107 } |
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108 |
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109 @Override |
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110 public void runtimeCheckCleared() { |
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111 if (isLoaded()) { |
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112 clearState(); |
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113 } |
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114 } |
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115 |
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116 /** |
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117 * Checks whether this field access will require patching. |
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118 * @return {@code true} if this field access will require patching |
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119 */ |
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120 public boolean needsPatching() { |
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121 return checkFlag(Flag.NeedsPatching); |
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122 } |
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123 |
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124 /** |
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125 * Checks whether this field access may cause a trap or an exception, which |
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126 * is if it either requires a null check or needs patching. |
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127 * @return {@code true} if this field access can cause a trap |
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Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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128 */ |
9ec15d6914ca
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129 @Override |
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130 public boolean canTrap() { |
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131 return needsPatching() || needsNullCheck(); |
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132 } |
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133 |
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134 @Override |
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135 public void inputValuesDo(ValueClosure closure) { |
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136 object = closure.apply(object); |
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137 } |
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parents:
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138 } |