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/*
* Copyright (c) 1997, 2022, 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_OOPS_OOPSHIERARCHY_HPP
#define SHARE_OOPS_OOPSHIERARCHY_HPP
#include "metaprogramming/integralConstant.hpp"
#include "metaprogramming/primitiveConversions.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.
// Global offset instead of address for an oop within a java object.
enum class narrowOop : uint32_t { null = 0 };
// If compressed klass pointers then use narrowKlass.
typedef juint narrowKlass;
typedef void* OopOrNarrowOopStar;
#ifndef CHECK_UNHANDLED_OOPS
typedef class oopDesc* oop;
typedef class instanceOopDesc* instanceOop;
typedef class stackChunkOopDesc* stackChunkOop;
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 oopDesc;
extern "C" bool CheckUnhandledOops;
class oop {
oopDesc* _o;
void register_oop();
void unregister_oop();
void register_if_checking() {
if (CheckUnhandledOops) register_oop();
}
public:
oop() : _o(nullptr) { register_if_checking(); }
oop(const oop& o) : _o(o._o) { register_if_checking(); }
oop(oopDesc* o) : _o(o) { register_if_checking(); }
~oop() {
if (CheckUnhandledOops) unregister_oop();
}
oopDesc* obj() const { return _o; }
oopDesc* operator->() const { return _o; }
operator oopDesc* () const { return _o; }
bool operator==(const oop& o) const { return _o == o._o; }
bool operator!=(const oop& o) const { return _o != o._o; }
bool operator==(std::nullptr_t) const { return _o == nullptr; }
bool operator!=(std::nullptr_t) const { return _o != nullptr; }
oop& operator=(const oop& o) { _o = o._o; return *this; }
};
template<>
struct PrimitiveConversions::Translate<oop> : public TrueType {
typedef oop Value;
typedef oopDesc* Decayed;
static Decayed decay(Value x) { return x.obj(); }
static Value recover(Decayed x) { return oop(x); }
};
#define DEF_OOP(type) \
class type##OopDesc; \
class type##Oop : public oop { \
public: \
type##Oop() : oop() {} \
type##Oop(const type##Oop& o) : oop(o) {} \
type##Oop(const oop& o) : oop(o) {} \
type##Oop(type##OopDesc* o) : oop((oopDesc*)o) {} \
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; \
} \
}; \
\
template<> \
struct PrimitiveConversions::Translate<type##Oop> : public TrueType { \
typedef type##Oop Value; \
typedef type##OopDesc* Decayed; \
\
static Decayed decay(Value x) { return (type##OopDesc*)x.obj(); } \
static Value recover(Decayed x) { return type##Oop(x); } \
};
DEF_OOP(instance);
DEF_OOP(stackChunk);
DEF_OOP(array);
DEF_OOP(objArray);
DEF_OOP(typeArray);
#endif // CHECK_UNHANDLED_OOPS
// Cast functions to convert to and from oops.
template <typename T> inline oop cast_to_oop(T value) {
return (oopDesc*)value;
}
template <typename T> inline T cast_from_oop(oop o) {
return (T)(CHECK_UNHANDLED_OOPS_ONLY((oopDesc*))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 InstanceStackChunkKlass;
class ArrayKlass;
class ObjArrayKlass;
class TypeArrayKlass;
#endif // SHARE_OOPS_OOPSHIERARCHY_HPP
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