annotate src/share/vm/oops/oopsHierarchy.hpp @ 12355:cefad50507d8

Merge with hs25-b53
author Gilles Duboscq <duboscq@ssw.jku.at>
date Fri, 11 Oct 2013 10:38:03 +0200
parents 190899198332
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1 /*
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2 * Copyright (c) 1997, 2013, 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 */
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24
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25 #ifndef SHARE_VM_OOPS_OOPSHIERARCHY_HPP
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26 #define SHARE_VM_OOPS_OOPSHIERARCHY_HPP
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27
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28 #include "runtime/globals.hpp"
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29 #include "utilities/globalDefinitions.hpp"
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30
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31 // OBJECT hierarchy
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32 // This hierarchy is a representation hierarchy, i.e. if A is a superclass
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33 // of B, A's representation is a prefix of B's representation.
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34
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35 typedef juint narrowOop; // Offset instead of address for an oop within a java object
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36
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37 // If compressed klass pointers then use narrowKlass.
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38 typedef juint narrowKlass;
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39
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40 typedef void* OopOrNarrowOopStar;
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41 typedef class markOopDesc* markOop;
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42
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43 #ifndef CHECK_UNHANDLED_OOPS
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44
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45 typedef class oopDesc* oop;
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46 typedef class instanceOopDesc* instanceOop;
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47 typedef class arrayOopDesc* arrayOop;
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48 typedef class objArrayOopDesc* objArrayOop;
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49 typedef class typeArrayOopDesc* typeArrayOop;
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50
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51 #else
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52
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53 // When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a
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54 // carefully chosen set of constructors and conversion operators to go
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55 // to and from the underlying oopDesc pointer type.
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56 //
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57 // Because oop and its subclasses <type>Oop are class types, arbitrary
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58 // conversions are not accepted by the compiler. Applying a cast to
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59 // an oop will cause the best matched conversion operator to be
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60 // invoked returning the underlying oopDesc* type if appropriate.
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61 // No copy constructors, explicit user conversions or operators of
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62 // numerical type should be defined within the oop class. Most C++
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63 // compilers will issue a compile time error concerning the overloading
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64 // ambiguity between operators of numerical and pointer types. If
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65 // a conversion to or from an oop to a numerical type is needed,
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66 // use the inline template methods, cast_*_oop, defined below.
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67 //
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68 // Converting NULL to oop to Handle implicit is no longer accepted by the
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69 // compiler because there are too many steps in the conversion. Use Handle()
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70 // instead, which generates less code anyway.
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71
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72 class Thread;
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73 class PromotedObject;
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74
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75
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76 class oop {
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77 oopDesc* _o;
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78
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79 void register_oop();
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80 void unregister_oop();
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81
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82 // friend class markOop;
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83 public:
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84 void set_obj(const void* p) {
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85 raw_set_obj(p);
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86 if (CheckUnhandledOops) register_oop();
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87 }
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88 void raw_set_obj(const void* p) { _o = (oopDesc*)p; }
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89
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90 oop() { set_obj(NULL); }
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91 oop(const oop& o) { set_obj(o.obj()); }
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92 oop(const volatile oop& o) { set_obj(o.obj()); }
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93 oop(const void* p) { set_obj(p); }
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94 ~oop() {
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95 if (CheckUnhandledOops) unregister_oop();
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96 }
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97
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98 oopDesc* obj() const volatile { return _o; }
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99
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100 // General access
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101 oopDesc* operator->() const { return obj(); }
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102 bool operator==(const oop o) const { return obj() == o.obj(); }
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103 bool operator==(void *p) const { return obj() == p; }
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104 bool operator!=(const volatile oop o) const { return obj() != o.obj(); }
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105 bool operator!=(void *p) const { return obj() != p; }
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106
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107 bool operator<(oop o) const { return obj() < o.obj(); }
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108 bool operator>(oop o) const { return obj() > o.obj(); }
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109 bool operator<=(oop o) const { return obj() <= o.obj(); }
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110 bool operator>=(oop o) const { return obj() >= o.obj(); }
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111 bool operator!() const { return !obj(); }
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112
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113 // Assignment
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114 oop& operator=(const oop& o) { _o = o.obj(); return *this; }
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115 #ifndef SOLARIS
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116 volatile oop& operator=(const oop& o) volatile { _o = o.obj(); return *this; }
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117 #endif
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118 volatile oop& operator=(const volatile oop& o) volatile { _o = o.obj(); return *this; }
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119
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120 // Explict user conversions
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121 operator void* () const { return (void *)obj(); }
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122 #ifndef SOLARIS
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123 operator void* () const volatile { return (void *)obj(); }
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124 #endif
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125 operator HeapWord* () const { return (HeapWord*)obj(); }
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126 operator oopDesc* () const { return obj(); }
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127 operator intptr_t* () const { return (intptr_t*)obj(); }
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128 operator PromotedObject* () const { return (PromotedObject*)obj(); }
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129 operator markOop () const { return markOop(obj()); }
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130
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131 operator address () const { return (address)obj(); }
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132
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133 // from javaCalls.cpp
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134 operator jobject () const { return (jobject)obj(); }
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135 // from javaClasses.cpp
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136 operator JavaThread* () const { return (JavaThread*)obj(); }
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137
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138 #ifndef _LP64
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139 // from jvm.cpp
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140 operator jlong* () const { return (jlong*)obj(); }
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141 #endif
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142
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143 // from parNewGeneration and other things that want to get to the end of
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144 // an oop for stuff (like ObjArrayKlass.cpp)
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145 operator oop* () const { return (oop *)obj(); }
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146 };
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147
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148 #define DEF_OOP(type) \
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149 class type##OopDesc; \
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150 class type##Oop : public oop { \
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151 public: \
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152 type##Oop() : oop() {} \
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153 type##Oop(const oop& o) : oop(o) {} \
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154 type##Oop(const volatile oop& o) : oop(o) {} \
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155 type##Oop(const void* p) : oop(p) {} \
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156 operator type##OopDesc* () const { return (type##OopDesc*)obj(); } \
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157 type##OopDesc* operator->() const { \
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158 return (type##OopDesc*)obj(); \
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159 } \
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160 type##Oop& operator=(const type##Oop& o) { \
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161 oop::operator=(o); \
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162 return *this; \
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163 } \
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164 NOT_SOLARIS( \
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165 volatile type##Oop& operator=(const type##Oop& o) volatile { \
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166 (void)const_cast<oop&>(oop::operator=(o)); \
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167 return *this; \
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168 }) \
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169 volatile type##Oop& operator=(const volatile type##Oop& o) volatile {\
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170 (void)const_cast<oop&>(oop::operator=(o)); \
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171 return *this; \
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172 } \
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173 };
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174
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175 DEF_OOP(instance);
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176 DEF_OOP(array);
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177 DEF_OOP(objArray);
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178 DEF_OOP(typeArray);
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179
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180 #endif // CHECK_UNHANDLED_OOPS
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181
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182 // For CHECK_UNHANDLED_OOPS, it is ambiguous C++ behavior to have the oop
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183 // structure contain explicit user defined conversions of both numerical
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184 // and pointer type. Define inline methods to provide the numerical conversions.
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185 template <class T> inline oop cast_to_oop(T value) {
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186 return (oop)(CHECK_UNHANDLED_OOPS_ONLY((void *))(value));
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187 }
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188 template <class T> inline T cast_from_oop(oop o) {
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189 return (T)(CHECK_UNHANDLED_OOPS_ONLY((void*))o);
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190 }
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191
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192 // The metadata hierarchy is separate from the oop hierarchy
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193
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194 // class MetaspaceObj
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195 class ConstMethod;
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196 class ConstantPoolCache;
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197 class MethodData;
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198 // class Metadata
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199 class Method;
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200 class ConstantPool;
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201 // class CHeapObj
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202 class CompiledICHolder;
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203
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204
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205 // The klass hierarchy is separate from the oop hierarchy.
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206
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207 class Klass;
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208 class InstanceKlass;
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209 class InstanceMirrorKlass;
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210 class InstanceClassLoaderKlass;
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211 class InstanceRefKlass;
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212 class ArrayKlass;
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213 class ObjArrayKlass;
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214 class TypeArrayKlass;
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215
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216 #endif // SHARE_VM_OOPS_OOPSHIERARCHY_HPP