jdk8-mips64-public/hotspot: src/share/vm/oops/oopsHierarchy.hpp@f90c822e73f8 (annotated)

src/share/vm/oops/oopsHierarchy.hpp@f90c822e73f8 (annotated)

src/share/vm/oops/oopsHierarchy.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * 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.  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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/oopsHierarchy.hpp@f90c822e73f8 (annotated)

src/share/vm/oops/oopsHierarchy.hpp