/*

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#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, 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;

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 volatile 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 volatile { return (intptr_t)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 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(array);

DEF_OOP(objArray);

DEF_OOP(typeArray);

#endif // CHECK_UNHANDLED_OOPS

// 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