1 /* 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OOPS_OOPSHIERARCHY_HPP 26 #define SHARE_VM_OOPS_OOPSHIERARCHY_HPP 27 28 #include "runtime/globals.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 31 // OBJECT hierarchy 32 // This hierarchy is a representation hierarchy, i.e. if A is a superclass 33 // of B, A's representation is a prefix of B's representation. 34 35 typedef juint narrowOop; // Offset instead of address for an oop within a java object 36 typedef class klassOopDesc* wideKlassOop; // to keep SA happy and unhandled oop 37 // detector happy. 38 typedef void* OopOrNarrowOopStar; 39 40 #ifndef CHECK_UNHANDLED_OOPS 41 42 typedef class oopDesc* oop; 43 typedef class instanceOopDesc* instanceOop; 44 typedef class methodOopDesc* methodOop; 45 typedef class constMethodOopDesc* constMethodOop; 46 typedef class methodDataOopDesc* methodDataOop; 47 typedef class arrayOopDesc* arrayOop; 48 typedef class objArrayOopDesc* objArrayOop; 49 typedef class typeArrayOopDesc* typeArrayOop; 50 typedef class constantPoolOopDesc* constantPoolOop; 51 typedef class constantPoolCacheOopDesc* constantPoolCacheOop; 52 typedef class symbolOopDesc* symbolOop; 53 typedef class klassOopDesc* klassOop; 54 typedef class markOopDesc* markOop; 55 typedef class compiledICHolderOopDesc* compiledICHolderOop; 56 57 #else 58 59 60 // When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a 61 // carefully chosen set of constructors and conversion operators to go 62 // to and from the underlying oopDesc pointer type. 63 // 64 // Because oop and its subclasses <type>Oop are class types, arbitrary 65 // conversions are not accepted by the compiler, and you may get a message 66 // about overloading ambiguity (between long and int is common when converting 67 // from a constant in 64 bit mode), or unable to convert from type to 'oop'. 68 // Applying a cast to one of these conversion operators first will get to the 69 // underlying oopDesc* type if appropriate. 70 // Converting NULL to oop to Handle implicit is no longer accepted by the 71 // compiler because there are too many steps in the conversion. Use Handle() 72 // instead, which generates less code anyway. 73 74 class Thread; 75 typedef class markOopDesc* markOop; 76 class PromotedObject; 77 78 79 class oop { 80 oopDesc* _o; 81 82 void register_oop(); 83 void unregister_oop(); 84 85 // friend class markOop; 86 public: 87 void set_obj(const void* p) { 88 raw_set_obj(p); 89 if (CheckUnhandledOops) register_oop(); 90 } 91 void raw_set_obj(const void* p) { _o = (oopDesc*)p; } 92 93 oop() { set_obj(NULL); } 94 oop(const volatile oop& o) { set_obj(o.obj()); } 95 oop(const void* p) { set_obj(p); } 96 oop(intptr_t i) { set_obj((void *)i); } 97 #ifdef _LP64 98 oop(int i) { set_obj((void *)i); } 99 #endif 100 ~oop() { 101 if (CheckUnhandledOops) unregister_oop(); 102 } 103 104 oopDesc* obj() const volatile { return _o; } 105 106 // General access 107 oopDesc* operator->() const { return obj(); } 108 bool operator==(const oop o) const { return obj() == o.obj(); } 109 bool operator==(void *p) const { return obj() == p; } 110 bool operator!=(const oop o) const { return obj() != o.obj(); } 111 bool operator!=(void *p) const { return obj() != p; } 112 bool operator==(intptr_t p) const { return obj() == (oopDesc*)p; } 113 bool operator!=(intptr_t p) const { return obj() != (oopDesc*)p; } 114 115 bool operator<(oop o) const { return obj() < o.obj(); } 116 bool operator>(oop o) const { return obj() > o.obj(); } 117 bool operator<=(oop o) const { return obj() <= o.obj(); } 118 bool operator>=(oop o) const { return obj() >= o.obj(); } 119 bool operator!() const { return !obj(); } 120 121 // Cast 122 operator void* () const { return (void *)obj(); } 123 operator HeapWord* () const { return (HeapWord*)obj(); } 124 operator oopDesc* () const { return obj(); } 125 operator intptr_t* () const { return (intptr_t*)obj(); } 126 operator PromotedObject* () const { return (PromotedObject*)obj(); } 127 operator markOop () const { return markOop(obj()); } 128 129 operator address () const { return (address)obj(); } 130 operator intptr_t () const { return (intptr_t)obj(); } 131 132 // from javaCalls.cpp 133 operator jobject () const { return (jobject)obj(); } 134 // from javaClasses.cpp 135 operator JavaThread* () const { return (JavaThread*)obj(); } 136 137 #ifndef _LP64 138 // from jvm.cpp 139 operator jlong* () const { return (jlong*)obj(); } 140 #endif 141 142 // from parNewGeneration and other things that want to get to the end of 143 // an oop for stuff (like constMethodKlass.cpp, objArrayKlass.cpp) 144 operator oop* () const { return (oop *)obj(); } 145 }; 146 147 #define DEF_OOP(type) \ 148 class type##OopDesc; \ 149 class type##Oop : public oop { \ 150 public: \ 151 type##Oop() : oop() {} \ 152 type##Oop(const volatile oop& o) : oop(o) {} \ 153 type##Oop(const void* p) : oop(p) {} \ 154 operator type##OopDesc* () const { return (type##OopDesc*)obj(); } \ 155 type##OopDesc* operator->() const { \ 156 return (type##OopDesc*)obj(); \ 157 } \ 158 }; \ 159 160 DEF_OOP(instance); 161 DEF_OOP(method); 162 DEF_OOP(methodData); 163 DEF_OOP(array); 164 DEF_OOP(constMethod); 165 DEF_OOP(constantPool); 166 DEF_OOP(constantPoolCache); 167 DEF_OOP(objArray); 168 DEF_OOP(typeArray); 169 DEF_OOP(symbol); 170 DEF_OOP(klass); 171 DEF_OOP(compiledICHolder); 172 173 #endif // CHECK_UNHANDLED_OOPS 174 175 // The klass hierarchy is separate from the oop hierarchy. 176 177 class Klass; 178 class instanceKlass; 179 class instanceRefKlass; 180 class methodKlass; 181 class constMethodKlass; 182 class methodDataKlass; 183 class klassKlass; 184 class instanceKlassKlass; 185 class arrayKlassKlass; 186 class objArrayKlassKlass; 187 class typeArrayKlassKlass; 188 class arrayKlass; 189 class objArrayKlass; 190 class typeArrayKlass; 191 class constantPoolKlass; 192 class constantPoolCacheKlass; 193 class symbolKlass; 194 class compiledICHolderKlass; 195 196 #endif // SHARE_VM_OOPS_OOPSHIERARCHY_HPP