#ifdef USE_PRAGMA_IDENT_HDR #pragma ident "@(#)oopsHierarchy.hpp 1.31 07/05/17 15:57:10 JVM" #endif /* * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // OBJECT hierarchy // This hierarchy is a representation hierarchy, i.e. if A is a superclass // of B, A's representation is a prefix of B's representation. typedef juint narrowOop; // Offset instead of address for an oop within a java object typedef class klassOopDesc* wideKlassOop; // to keep SA happy and unhandled oop // detector happy. #ifndef CHECK_UNHANDLED_OOPS typedef class oopDesc* oop; typedef class instanceOopDesc* instanceOop; typedef class methodOopDesc* methodOop; typedef class constMethodOopDesc* constMethodOop; typedef class methodDataOopDesc* methodDataOop; typedef class arrayOopDesc* arrayOop; typedef class objArrayOopDesc* objArrayOop; typedef class typeArrayOopDesc* typeArrayOop; typedef class constantPoolOopDesc* constantPoolOop; typedef class constantPoolCacheOopDesc* constantPoolCacheOop; typedef class symbolOopDesc* symbolOop; typedef class klassOopDesc* klassOop; typedef class markOopDesc* markOop; typedef class compiledICHolderOopDesc* compiledICHolderOop; #else // When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a // carefully chosen set of constructors and conversion operators to go // to and from the underlying oopDesc pointer type. // // Because oop and its subclasses Oop are class types, arbitrary // conversions are not accepted by the compiler, and you may get a message // about overloading ambiguity (between long and int is common when converting // from a constant in 64 bit mode), or unable to convert from type to 'oop'. // Applying a cast to one of these conversion operators first will get to the // underlying oopDesc* type if appropriate. // Converting NULL to oop to Handle implicit is no longer accepted by the // compiler because there are too many steps in the conversion. Use Handle() // instead, which generates less code anyway. class Thread; typedef class markOopDesc* markOop; class PromotedObject; class oop { oopDesc* _o; void register_oop(); void unregister_oop(); // friend class markOop; public: void set_obj(const void* p) { raw_set_obj(p); if (CheckUnhandledOops) register_oop(); } void raw_set_obj(const void* p) { _o = (oopDesc*)p; } oop() { set_obj(NULL); } oop(const volatile oop& o) { set_obj(o.obj()); } oop(const void* p) { set_obj(p); } oop(intptr_t i) { set_obj((void *)i); } #ifdef _LP64 oop(int i) { set_obj((void *)i); } #endif ~oop() { if (CheckUnhandledOops) unregister_oop(); } oopDesc* obj() const volatile { return _o; } // General access oopDesc* operator->() const { return obj(); } bool operator==(const oop o) const { return obj() == o.obj(); } bool operator==(void *p) const { return obj() == p; } bool operator!=(const oop o) const { return obj() != o.obj(); } bool operator!=(void *p) const { return obj() != p; } bool operator==(intptr_t p) const { return obj() == (oopDesc*)p; } bool operator!=(intptr_t p) const { return obj() != (oopDesc*)p; } bool operator<(oop o) const { return obj() < o.obj(); } bool operator>(oop o) const { return obj() > o.obj(); } bool operator<=(oop o) const { return obj() <= o.obj(); } bool operator>=(oop o) const { return obj() >= o.obj(); } bool operator!() const { return !obj(); } // Cast operator void* () const { return (void *)obj(); } operator HeapWord* () const { return (HeapWord*)obj(); } operator oopDesc* () const { return obj(); } operator intptr_t* () const { return (intptr_t*)obj(); } operator PromotedObject* () const { return (PromotedObject*)obj(); } operator markOop () const { return markOop(obj()); } operator address () const { return (address)obj(); } operator intptr_t () const { return (intptr_t)obj(); } // from javaCalls.cpp operator jobject () const { return (jobject)obj(); } // from javaClasses.cpp operator JavaThread* () const { return (JavaThread*)obj(); } // from jvm.cpp operator jlong* () const { return (jlong*)obj(); } // from parNewGeneration and other things that want to get to the end of // an oop for stuff (like constMethodKlass.cpp, objArrayKlass.cpp) operator oop* () const { return (oop *)obj(); } }; #define DEF_OOP(type) \ class type##OopDesc; \ class type##Oop : public oop { \ public: \ type##Oop() : oop() {} \ type##Oop(const volatile oop& o) : oop(o) {} \ type##Oop(const void* p) : oop(p) {} \ operator type##OopDesc* () const { return (type##OopDesc*)obj(); } \ type##OopDesc* operator->() const { \ return (type##OopDesc*)obj(); \ } \ }; \ DEF_OOP(instance); DEF_OOP(method); DEF_OOP(methodData); DEF_OOP(array); DEF_OOP(constMethod); DEF_OOP(constantPool); DEF_OOP(constantPoolCache); DEF_OOP(objArray); DEF_OOP(typeArray); DEF_OOP(symbol); DEF_OOP(klass); DEF_OOP(compiledICHolder); #endif // CHECK_UNHANDLED_OOPS // The klass hierarchy is separate from the oop hierarchy. class Klass; class instanceKlass; class instanceRefKlass; class methodKlass; class constMethodKlass; class methodDataKlass; class klassKlass; class instanceKlassKlass; class arrayKlassKlass; class objArrayKlassKlass; class typeArrayKlassKlass; class arrayKlass; class objArrayKlass; class typeArrayKlass; class constantPoolKlass; class constantPoolCacheKlass; class symbolKlass; class compiledICHolderKlass;