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annotate graal/Compiler/src/com/sun/c1x/ir/AccessField.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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children
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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 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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128 */
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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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138 }