180 lines
6.7 KiB
C++
180 lines
6.7 KiB
C++
/*
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* Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_OOPS_OOPSHIERARCHY_HPP
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#define SHARE_VM_OOPS_OOPSHIERARCHY_HPP
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#include "runtime/globals.hpp"
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#include "utilities/globalDefinitions.hpp"
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// OBJECT hierarchy
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// This hierarchy is a representation hierarchy, i.e. if A is a superclass
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// of B, A's representation is a prefix of B's representation.
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typedef juint narrowOop; // Offset instead of address for an oop within a java object
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typedef void* OopOrNarrowOopStar;
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typedef class markOopDesc* markOop;
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#ifndef CHECK_UNHANDLED_OOPS
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typedef class oopDesc* oop;
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typedef class instanceOopDesc* instanceOop;
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typedef class arrayOopDesc* arrayOop;
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typedef class objArrayOopDesc* objArrayOop;
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typedef class typeArrayOopDesc* typeArrayOop;
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#else
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// When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a
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// carefully chosen set of constructors and conversion operators to go
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// to and from the underlying oopDesc pointer type.
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//
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// Because oop and its subclasses <type>Oop are class types, arbitrary
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// conversions are not accepted by the compiler, and you may get a message
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// about overloading ambiguity (between long and int is common when converting
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// from a constant in 64 bit mode), or unable to convert from type to 'oop'.
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// Applying a cast to one of these conversion operators first will get to the
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// underlying oopDesc* type if appropriate.
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// Converting NULL to oop to Handle implicit is no longer accepted by the
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// compiler because there are too many steps in the conversion. Use Handle()
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// instead, which generates less code anyway.
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class Thread;
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class PromotedObject;
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class oop {
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oopDesc* _o;
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void register_oop();
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void unregister_oop();
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// friend class markOop;
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public:
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void set_obj(const void* p) {
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raw_set_obj(p);
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if (CheckUnhandledOops) register_oop();
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}
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void raw_set_obj(const void* p) { _o = (oopDesc*)p; }
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oop() { set_obj(NULL); }
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oop(const volatile oop& o) { set_obj(o.obj()); }
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oop(const void* p) { set_obj(p); }
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oop(intptr_t i) { set_obj((void *)i); }
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#ifdef _LP64
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oop(int i) { set_obj((void *)i); }
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#endif
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~oop() {
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if (CheckUnhandledOops) unregister_oop();
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}
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oopDesc* obj() const volatile { return _o; }
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// General access
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oopDesc* operator->() const { return obj(); }
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bool operator==(const oop o) const { return obj() == o.obj(); }
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bool operator==(void *p) const { return obj() == p; }
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bool operator!=(const volatile oop o) const { return obj() != o.obj(); }
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bool operator!=(void *p) const { return obj() != p; }
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bool operator==(intptr_t p) const { return obj() == (oopDesc*)p; }
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bool operator!=(intptr_t p) const { return obj() != (oopDesc*)p; }
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bool operator<(oop o) const { return obj() < o.obj(); }
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bool operator>(oop o) const { return obj() > o.obj(); }
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bool operator<=(oop o) const { return obj() <= o.obj(); }
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bool operator>=(oop o) const { return obj() >= o.obj(); }
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bool operator!() const { return !obj(); }
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// Cast
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operator void* () const { return (void *)obj(); }
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operator HeapWord* () const { return (HeapWord*)obj(); }
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operator oopDesc* () const { return obj(); }
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operator intptr_t* () const { return (intptr_t*)obj(); }
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operator PromotedObject* () const { return (PromotedObject*)obj(); }
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operator markOop () const { return markOop(obj()); }
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operator address () const { return (address)obj(); }
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operator intptr_t () const volatile { return (intptr_t)obj(); }
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// from javaCalls.cpp
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operator jobject () const { return (jobject)obj(); }
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// from javaClasses.cpp
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operator JavaThread* () const { return (JavaThread*)obj(); }
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#ifndef _LP64
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// from jvm.cpp
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operator jlong* () const { return (jlong*)obj(); }
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#endif
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// from parNewGeneration and other things that want to get to the end of
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// an oop for stuff (like ObjArrayKlass.cpp)
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operator oop* () const { return (oop *)obj(); }
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};
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#define DEF_OOP(type) \
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class type##OopDesc; \
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class type##Oop : public oop { \
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public: \
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type##Oop() : oop() {} \
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type##Oop(const volatile oop& o) : oop(o) {} \
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type##Oop(const void* p) : oop(p) {} \
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operator type##OopDesc* () const { return (type##OopDesc*)obj(); } \
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type##OopDesc* operator->() const { \
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return (type##OopDesc*)obj(); \
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} \
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};
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DEF_OOP(instance);
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DEF_OOP(array);
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DEF_OOP(objArray);
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DEF_OOP(typeArray);
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#endif // CHECK_UNHANDLED_OOPS
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// The metadata hierarchy is separate from the oop hierarchy
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// class MetaspaceObj
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class ConstMethod;
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class ConstantPoolCache;
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class MethodData;
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// class Metadata
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class Method;
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class ConstantPool;
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// class CHeapObj
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class CompiledICHolder;
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// The klass hierarchy is separate from the oop hierarchy.
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class Klass;
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class InstanceKlass;
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class InstanceMirrorKlass;
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class InstanceClassLoaderKlass;
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class InstanceRefKlass;
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class ArrayKlass;
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class ObjArrayKlass;
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class TypeArrayKlass;
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#endif // SHARE_VM_OOPS_OOPSHIERARCHY_HPP
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