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annotate graal/GraalCompiler/src/com/sun/c1x/ir/AccessField.java @ 2539:fa3bda50cbfd

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More clean up on Value.Flags.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 20:22:05 +0200
parents e1ba5a93e997
children 3fc322165071
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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.*;
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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 public abstract class AccessField extends StateSplit {
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36
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37 private Value object;
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38 protected final RiField field;
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39 private boolean needsPatching;
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40
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41 /**
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42 * Constructs a new access field object.
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43 * @param kind the result kind of the access
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44 * @param object the instruction producing the receiver object
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45 * @param field the compiler interface representation of the field
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46 * @param isStatic indicates if the field is static
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47 * @param stateBefore the state before the field access
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48 * @param isLoaded indicates if the class is loaded
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49 */
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50 public AccessField(CiKind kind, Value object, RiField field, FrameState stateBefore, boolean isLoaded) {
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51 super(kind, stateBefore);
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52 this.object = object;
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53 this.field = field;
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54 if (!isLoaded || (C1XOptions.TestPatching && !Modifier.isVolatile(field.accessFlags()))) {
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55 // require patching if the field is not loaded (i.e. resolved),
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56 // or if patch testing is turned on (but not if the field is volatile)
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57 needsPatching = true;
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58 }
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59 initFlag(Flag.IsLoaded, isLoaded);
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60 if (isLoaded && object.isNonNull()) {
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61 eliminateNullCheck();
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62 }
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63 assert object != null : "every field access must reference some object";
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64 }
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65
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66 /**
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67 * Gets the instruction that produces the receiver object of this field access
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68 * (for instance field accesses).
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69 * @return the instruction that produces the receiver object
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70 */
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71 public Value object() {
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72 return object;
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73 }
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74
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75 /**
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76 * Gets the compiler interface field for this field access.
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77 * @return the compiler interface field for this field access
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78 */
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79 public RiField field() {
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80 return field;
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81 }
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82
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83 /**
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84 * Checks whether this field access is an access to a static field.
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85 * @return {@code true} if this field access is to a static field
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86 */
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87 public boolean isStatic() {
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88 return Modifier.isStatic(field.accessFlags());
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89 }
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90
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91 /**
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92 * Checks whether the class of the field of this access is loaded.
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93 * @return {@code true} if the class is loaded
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94 */
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95 public boolean isLoaded() {
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96 return checkFlag(Flag.IsLoaded);
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97 }
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98
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99 /**
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100 * Checks whether this field is declared volatile.
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101 * @return {@code true} if the field is resolved and declared volatile
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102 */
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103 public boolean isVolatile() {
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104 return isLoaded() && Modifier.isVolatile(field.accessFlags());
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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 if (isLoaded()) {
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110 clearState();
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111 }
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112 }
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113
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114 /**
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115 * Checks whether this field access will require patching.
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116 * @return {@code true} if this field access will require patching
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117 */
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118 public boolean needsPatching() {
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119 return needsPatching;
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120 }
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121
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122 /**
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123 * Checks whether this field access may cause a trap or an exception, which
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124 * is if it either requires a null check or needs patching.
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125 * @return {@code true} if this field access can cause a trap
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126 */
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127 @Override
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128 public boolean canTrap() {
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129 return needsPatching() || needsNullCheck();
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130 }
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131
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132 @Override
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133 public void inputValuesDo(ValueClosure closure) {
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134 object = closure.apply(object);
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135 }
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136 }