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* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
* 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 if you need additional information or have any
* questions.
#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
typedef class klassOopDesc* wideKlassOop; // to keep SA happy and unhandled oop
// detector happy.
typedef void* OopOrNarrowOopStar;
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 klassOopDesc* klassOop;
typedef class markOopDesc* markOop;
typedef class compiledICHolderOopDesc* compiledICHolderOop;
// 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;
typedef class markOopDesc* markOop;
class PromotedObject;
class oop {
oopDesc* _o;
void register_oop();
void unregister_oop();
// friend class markOop;
void set_obj(const void* 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); }
~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(); }
#ifndef _LP64
// 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(); \
} \
}; \
// The klass hierarchy is separate from the oop hierarchy.
class Klass;
class instanceKlass;
class instanceMirrorKlass;
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 compiledICHolderKlass;
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