oopsHierarchy.hpp revision 196:d1605aabd0a1
1/* 2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25// OBJECT hierarchy 26// This hierarchy is a representation hierarchy, i.e. if A is a superclass 27// of B, A's representation is a prefix of B's representation. 28 29typedef juint narrowOop; // Offset instead of address for an oop within a java object 30typedef class klassOopDesc* wideKlassOop; // to keep SA happy and unhandled oop 31 // detector happy. 32 33#ifndef CHECK_UNHANDLED_OOPS 34 35typedef class oopDesc* oop; 36typedef class instanceOopDesc* instanceOop; 37typedef class methodOopDesc* methodOop; 38typedef class constMethodOopDesc* constMethodOop; 39typedef class methodDataOopDesc* methodDataOop; 40typedef class arrayOopDesc* arrayOop; 41typedef class objArrayOopDesc* objArrayOop; 42typedef class typeArrayOopDesc* typeArrayOop; 43typedef class constantPoolOopDesc* constantPoolOop; 44typedef class constantPoolCacheOopDesc* constantPoolCacheOop; 45typedef class symbolOopDesc* symbolOop; 46typedef class klassOopDesc* klassOop; 47typedef class markOopDesc* markOop; 48typedef class compiledICHolderOopDesc* compiledICHolderOop; 49 50#else 51 52 53// When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a 54// carefully chosen set of constructors and conversion operators to go 55// to and from the underlying oopDesc pointer type. 56// 57// Because oop and its subclasses <type>Oop are class types, arbitrary 58// conversions are not accepted by the compiler, and you may get a message 59// about overloading ambiguity (between long and int is common when converting 60// from a constant in 64 bit mode), or unable to convert from type to 'oop'. 61// Applying a cast to one of these conversion operators first will get to the 62// underlying oopDesc* type if appropriate. 63// Converting NULL to oop to Handle implicit is no longer accepted by the 64// compiler because there are too many steps in the conversion. Use Handle() 65// instead, which generates less code anyway. 66 67class Thread; 68typedef class markOopDesc* markOop; 69class PromotedObject; 70 71 72class oop { 73 oopDesc* _o; 74 75 void register_oop(); 76 void unregister_oop(); 77 78 // friend class markOop; 79public: 80 void set_obj(const void* p) { 81 raw_set_obj(p); 82 if (CheckUnhandledOops) register_oop(); 83 } 84 void raw_set_obj(const void* p) { _o = (oopDesc*)p; } 85 86 oop() { set_obj(NULL); } 87 oop(const volatile oop& o) { set_obj(o.obj()); } 88 oop(const void* p) { set_obj(p); } 89 oop(intptr_t i) { set_obj((void *)i); } 90#ifdef _LP64 91 oop(int i) { set_obj((void *)i); } 92#endif 93 ~oop() { 94 if (CheckUnhandledOops) unregister_oop(); 95 } 96 97 oopDesc* obj() const volatile { return _o; } 98 99 // General access 100 oopDesc* operator->() const { return obj(); } 101 bool operator==(const oop o) const { return obj() == o.obj(); } 102 bool operator==(void *p) const { return obj() == p; } 103 bool operator!=(const oop o) const { return obj() != o.obj(); } 104 bool operator!=(void *p) const { return obj() != p; } 105 bool operator==(intptr_t p) const { return obj() == (oopDesc*)p; } 106 bool operator!=(intptr_t p) const { return obj() != (oopDesc*)p; } 107 108 bool operator<(oop o) const { return obj() < o.obj(); } 109 bool operator>(oop o) const { return obj() > o.obj(); } 110 bool operator<=(oop o) const { return obj() <= o.obj(); } 111 bool operator>=(oop o) const { return obj() >= o.obj(); } 112 bool operator!() const { return !obj(); } 113 114 // Cast 115 operator void* () const { return (void *)obj(); } 116 operator HeapWord* () const { return (HeapWord*)obj(); } 117 operator oopDesc* () const { return obj(); } 118 operator intptr_t* () const { return (intptr_t*)obj(); } 119 operator PromotedObject* () const { return (PromotedObject*)obj(); } 120 operator markOop () const { return markOop(obj()); } 121 122 operator address () const { return (address)obj(); } 123 operator intptr_t () const { return (intptr_t)obj(); } 124 125 // from javaCalls.cpp 126 operator jobject () const { return (jobject)obj(); } 127 // from javaClasses.cpp 128 operator JavaThread* () const { return (JavaThread*)obj(); } 129 // from jvm.cpp 130 operator jlong* () const { return (jlong*)obj(); } 131 132 // from parNewGeneration and other things that want to get to the end of 133 // an oop for stuff (like constMethodKlass.cpp, objArrayKlass.cpp) 134 operator oop* () const { return (oop *)obj(); } 135}; 136 137#define DEF_OOP(type) \ 138 class type##OopDesc; \ 139 class type##Oop : public oop { \ 140 public: \ 141 type##Oop() : oop() {} \ 142 type##Oop(const volatile oop& o) : oop(o) {} \ 143 type##Oop(const void* p) : oop(p) {} \ 144 operator type##OopDesc* () const { return (type##OopDesc*)obj(); } \ 145 type##OopDesc* operator->() const { \ 146 return (type##OopDesc*)obj(); \ 147 } \ 148 }; \ 149 150DEF_OOP(instance); 151DEF_OOP(method); 152DEF_OOP(methodData); 153DEF_OOP(array); 154DEF_OOP(constMethod); 155DEF_OOP(constantPool); 156DEF_OOP(constantPoolCache); 157DEF_OOP(objArray); 158DEF_OOP(typeArray); 159DEF_OOP(symbol); 160DEF_OOP(klass); 161DEF_OOP(compiledICHolder); 162 163#endif // CHECK_UNHANDLED_OOPS 164 165// The klass hierarchy is separate from the oop hierarchy. 166 167class Klass; 168class instanceKlass; 169class instanceRefKlass; 170class methodKlass; 171class constMethodKlass; 172class methodDataKlass; 173class klassKlass; 174class instanceKlassKlass; 175class arrayKlassKlass; 176class objArrayKlassKlass; 177class typeArrayKlassKlass; 178class arrayKlass; 179class objArrayKlass; 180class typeArrayKlass; 181class constantPoolKlass; 182class constantPoolCacheKlass; 183class symbolKlass; 184class compiledICHolderKlass; 185