1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/oops/oopsHierarchy.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,216 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_OOPS_OOPSHIERARCHY_HPP
1.29 +#define SHARE_VM_OOPS_OOPSHIERARCHY_HPP
1.30 +
1.31 +#include "runtime/globals.hpp"
1.32 +#include "utilities/globalDefinitions.hpp"
1.33 +
1.34 +// OBJECT hierarchy
1.35 +// This hierarchy is a representation hierarchy, i.e. if A is a superclass
1.36 +// of B, A's representation is a prefix of B's representation.
1.37 +
1.38 +typedef juint narrowOop; // Offset instead of address for an oop within a java object
1.39 +
1.40 +// If compressed klass pointers then use narrowKlass.
1.41 +typedef juint narrowKlass;
1.42 +
1.43 +typedef void* OopOrNarrowOopStar;
1.44 +typedef class markOopDesc* markOop;
1.45 +
1.46 +#ifndef CHECK_UNHANDLED_OOPS
1.47 +
1.48 +typedef class oopDesc* oop;
1.49 +typedef class instanceOopDesc* instanceOop;
1.50 +typedef class arrayOopDesc* arrayOop;
1.51 +typedef class objArrayOopDesc* objArrayOop;
1.52 +typedef class typeArrayOopDesc* typeArrayOop;
1.53 +
1.54 +#else
1.55 +
1.56 +// When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a
1.57 +// carefully chosen set of constructors and conversion operators to go
1.58 +// to and from the underlying oopDesc pointer type.
1.59 +//
1.60 +// Because oop and its subclasses <type>Oop are class types, arbitrary
1.61 +// conversions are not accepted by the compiler. Applying a cast to
1.62 +// an oop will cause the best matched conversion operator to be
1.63 +// invoked returning the underlying oopDesc* type if appropriate.
1.64 +// No copy constructors, explicit user conversions or operators of
1.65 +// numerical type should be defined within the oop class. Most C++
1.66 +// compilers will issue a compile time error concerning the overloading
1.67 +// ambiguity between operators of numerical and pointer types. If
1.68 +// a conversion to or from an oop to a numerical type is needed,
1.69 +// use the inline template methods, cast_*_oop, defined below.
1.70 +//
1.71 +// Converting NULL to oop to Handle implicit is no longer accepted by the
1.72 +// compiler because there are too many steps in the conversion. Use Handle()
1.73 +// instead, which generates less code anyway.
1.74 +
1.75 +class Thread;
1.76 +class PromotedObject;
1.77 +
1.78 +
1.79 +class oop {
1.80 + oopDesc* _o;
1.81 +
1.82 + void register_oop();
1.83 + void unregister_oop();
1.84 +
1.85 + // friend class markOop;
1.86 +public:
1.87 + void set_obj(const void* p) {
1.88 + raw_set_obj(p);
1.89 + if (CheckUnhandledOops) register_oop();
1.90 + }
1.91 + void raw_set_obj(const void* p) { _o = (oopDesc*)p; }
1.92 +
1.93 + oop() { set_obj(NULL); }
1.94 + oop(const oop& o) { set_obj(o.obj()); }
1.95 + oop(const volatile oop& o) { set_obj(o.obj()); }
1.96 + oop(const void* p) { set_obj(p); }
1.97 + ~oop() {
1.98 + if (CheckUnhandledOops) unregister_oop();
1.99 + }
1.100 +
1.101 + oopDesc* obj() const volatile { return _o; }
1.102 +
1.103 + // General access
1.104 + oopDesc* operator->() const { return obj(); }
1.105 + bool operator==(const oop o) const { return obj() == o.obj(); }
1.106 + bool operator==(void *p) const { return obj() == p; }
1.107 + bool operator!=(const volatile oop o) const { return obj() != o.obj(); }
1.108 + bool operator!=(void *p) const { return obj() != p; }
1.109 +
1.110 + bool operator<(oop o) const { return obj() < o.obj(); }
1.111 + bool operator>(oop o) const { return obj() > o.obj(); }
1.112 + bool operator<=(oop o) const { return obj() <= o.obj(); }
1.113 + bool operator>=(oop o) const { return obj() >= o.obj(); }
1.114 + bool operator!() const { return !obj(); }
1.115 +
1.116 + // Assignment
1.117 + oop& operator=(const oop& o) { _o = o.obj(); return *this; }
1.118 +#ifndef SOLARIS
1.119 + volatile oop& operator=(const oop& o) volatile { _o = o.obj(); return *this; }
1.120 +#endif
1.121 + volatile oop& operator=(const volatile oop& o) volatile { _o = o.obj(); return *this; }
1.122 +
1.123 + // Explict user conversions
1.124 + operator void* () const { return (void *)obj(); }
1.125 +#ifndef SOLARIS
1.126 + operator void* () const volatile { return (void *)obj(); }
1.127 +#endif
1.128 + operator HeapWord* () const { return (HeapWord*)obj(); }
1.129 + operator oopDesc* () const { return obj(); }
1.130 + operator intptr_t* () const { return (intptr_t*)obj(); }
1.131 + operator PromotedObject* () const { return (PromotedObject*)obj(); }
1.132 + operator markOop () const { return markOop(obj()); }
1.133 +
1.134 + operator address () const { return (address)obj(); }
1.135 +
1.136 + // from javaCalls.cpp
1.137 + operator jobject () const { return (jobject)obj(); }
1.138 + // from javaClasses.cpp
1.139 + operator JavaThread* () const { return (JavaThread*)obj(); }
1.140 +
1.141 +#ifndef _LP64
1.142 + // from jvm.cpp
1.143 + operator jlong* () const { return (jlong*)obj(); }
1.144 +#endif
1.145 +
1.146 + // from parNewGeneration and other things that want to get to the end of
1.147 + // an oop for stuff (like ObjArrayKlass.cpp)
1.148 + operator oop* () const { return (oop *)obj(); }
1.149 +};
1.150 +
1.151 +#define DEF_OOP(type) \
1.152 + class type##OopDesc; \
1.153 + class type##Oop : public oop { \
1.154 + public: \
1.155 + type##Oop() : oop() {} \
1.156 + type##Oop(const oop& o) : oop(o) {} \
1.157 + type##Oop(const volatile oop& o) : oop(o) {} \
1.158 + type##Oop(const void* p) : oop(p) {} \
1.159 + operator type##OopDesc* () const { return (type##OopDesc*)obj(); } \
1.160 + type##OopDesc* operator->() const { \
1.161 + return (type##OopDesc*)obj(); \
1.162 + } \
1.163 + type##Oop& operator=(const type##Oop& o) { \
1.164 + oop::operator=(o); \
1.165 + return *this; \
1.166 + } \
1.167 + NOT_SOLARIS( \
1.168 + volatile type##Oop& operator=(const type##Oop& o) volatile { \
1.169 + (void)const_cast<oop&>(oop::operator=(o)); \
1.170 + return *this; \
1.171 + }) \
1.172 + volatile type##Oop& operator=(const volatile type##Oop& o) volatile {\
1.173 + (void)const_cast<oop&>(oop::operator=(o)); \
1.174 + return *this; \
1.175 + } \
1.176 + };
1.177 +
1.178 +DEF_OOP(instance);
1.179 +DEF_OOP(array);
1.180 +DEF_OOP(objArray);
1.181 +DEF_OOP(typeArray);
1.182 +
1.183 +#endif // CHECK_UNHANDLED_OOPS
1.184 +
1.185 +// For CHECK_UNHANDLED_OOPS, it is ambiguous C++ behavior to have the oop
1.186 +// structure contain explicit user defined conversions of both numerical
1.187 +// and pointer type. Define inline methods to provide the numerical conversions.
1.188 +template <class T> inline oop cast_to_oop(T value) {
1.189 + return (oop)(CHECK_UNHANDLED_OOPS_ONLY((void *))(value));
1.190 +}
1.191 +template <class T> inline T cast_from_oop(oop o) {
1.192 + return (T)(CHECK_UNHANDLED_OOPS_ONLY((void*))o);
1.193 +}
1.194 +
1.195 +// The metadata hierarchy is separate from the oop hierarchy
1.196 +
1.197 +// class MetaspaceObj
1.198 +class ConstMethod;
1.199 +class ConstantPoolCache;
1.200 +class MethodData;
1.201 +// class Metadata
1.202 +class Method;
1.203 +class ConstantPool;
1.204 +// class CHeapObj
1.205 +class CompiledICHolder;
1.206 +
1.207 +
1.208 +// The klass hierarchy is separate from the oop hierarchy.
1.209 +
1.210 +class Klass;
1.211 +class InstanceKlass;
1.212 +class InstanceMirrorKlass;
1.213 +class InstanceClassLoaderKlass;
1.214 +class InstanceRefKlass;
1.215 +class ArrayKlass;
1.216 +class ObjArrayKlass;
1.217 +class TypeArrayKlass;
1.218 +
1.219 +#endif // SHARE_VM_OOPS_OOPSHIERARCHY_HPP
