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 /*

  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 #ifndef SHARE_VM_OOPS_OOPSHIERARCHY_HPP

 #define SHARE_VM_OOPS_OOPSHIERARCHY_HPP

 #include "runtime/globals.hpp"

 #include "utilities/globalDefinitions.hpp"

 // 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

 // If compressed klass pointers then use narrowKlass.

 typedef juint  narrowKlass;

 typedef void* OopOrNarrowOopStar;

 typedef class   markOopDesc*                markOop;

 #ifndef CHECK_UNHANDLED_OOPS

 typedef class oopDesc*                            oop;

 typedef class   instanceOopDesc*            instanceOop;

 typedef class   arrayOopDesc*                    arrayOop;

 typedef class     objArrayOopDesc*            objArrayOop;

 typedef class     typeArrayOopDesc*            typeArrayOop;

 #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 <type>Oop are class types, arbitrary

 // conversions are not accepted by the compiler.  Applying a cast to

 // an oop will cause the best matched conversion operator to be

 // invoked returning the underlying oopDesc* type if appropriate.

 // No copy constructors, explicit user conversions or operators of

 // numerical type should be defined within the oop class. Most C++

 // compilers will issue a compile time error concerning the overloading

 // ambiguity between operators of numerical and pointer types. If

 // a conversion to or from an oop to a numerical type is needed,

 // use the inline template methods, cast_*_oop, defined below.

 //

 // 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;

 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 oop& o)                   { set_obj(o.obj()); }

   oop(const volatile oop& o)          { set_obj(o.obj()); }

   oop(const void* p)                  { set_obj(p); }

   ~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 volatile oop o) const  { return obj() != o.obj(); }

   bool operator!=(void *p) const      { return obj() != 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(); }

   // Assignment

   oop& operator=(const oop& o)                            { _o = o.obj(); return *this; }

 #ifndef SOLARIS

   volatile oop& operator=(const oop& o) volatile          { _o = o.obj(); return *this; }

 #endif

   volatile oop& operator=(const volatile oop& o) volatile { _o = o.obj(); return *this; }

   // Explict user conversions

   operator void* () const             { return (void *)obj(); }

 #ifndef SOLARIS

   operator void* () const volatile    { return (void *)obj(); }

 #endif

   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(); }

   // from javaCalls.cpp

   operator jobject () const           { return (jobject)obj(); }

   // from javaClasses.cpp

   operator JavaThread* () const       { return (JavaThread*)obj(); }

 #ifndef _LP64

   // from jvm.cpp

   operator jlong* () const            { return (jlong*)obj(); }

 #endif

   // from parNewGeneration and other things that want to get to the end of

   // an oop for stuff (like 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 oop& o) : oop(o) {}                                 \

        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();                                  \

        }                                                                   \

        type##Oop& operator=(const type##Oop& o) {                          \

             oop::operator=(o);                                             \

             return *this;                                                  \

        }                                                                   \

        NOT_SOLARIS(                                                        \

        volatile type##Oop& operator=(const type##Oop& o) volatile {        \

             (void)const_cast<oop&>(oop::operator=(o));                     \

             return *this;                                                  \

        })                                                                  \

        volatile type##Oop& operator=(const volatile type##Oop& o) volatile {\

             (void)const_cast<oop&>(oop::operator=(o));                     \

             return *this;                                                  \

        }                                                                   \

    };

 DEF_OOP(instance);

 DEF_OOP(array);

 DEF_OOP(objArray);

 DEF_OOP(typeArray);

 #endif // CHECK_UNHANDLED_OOPS

 // For CHECK_UNHANDLED_OOPS, it is ambiguous C++ behavior to have the oop

 // structure contain explicit user defined conversions of both numerical

 // and pointer type. Define inline methods to provide the numerical conversions.

 template <class T> inline oop cast_to_oop(T value) {

   return (oop)(CHECK_UNHANDLED_OOPS_ONLY((void *))(value));

 }

 template <class T> inline T cast_from_oop(oop o) {

   return (T)(CHECK_UNHANDLED_OOPS_ONLY((void*))o);

 }

 // The metadata hierarchy is separate from the oop hierarchy

 //      class MetaspaceObj

 class   ConstMethod;

 class   ConstantPoolCache;

 class   MethodData;

 //      class Metadata

 class   Method;

 class   ConstantPool;

 //      class CHeapObj

 class   CompiledICHolder;

 // The klass hierarchy is separate from the oop hierarchy.

 class Klass;

 class   InstanceKlass;

 class     InstanceMirrorKlass;

 class     InstanceClassLoaderKlass;

 class     InstanceRefKlass;

 class   ArrayKlass;

 class     ObjArrayKlass;

 class     TypeArrayKlass;

 #endif // SHARE_VM_OOPS_OOPSHIERARCHY_HPP