--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/oops/oopsHierarchy.hpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,223 @@
+/*
+ * Copyright (c) 1997, 2017, 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 "metaprogramming/integralConstant.hpp"
+#include "metaprogramming/primitiveConversions.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; }
+ volatile oop& operator=(const oop& o) volatile { _o = o.obj(); return *this; }
+ 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 volatile { return obj(); }
+ operator intptr_t* () const { return (intptr_t*)obj(); }
+ operator PromotedObject* () const { return (PromotedObject*)obj(); }
+ operator markOop () const volatile { 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(); }
+};
+
+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 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; \
+ } \
+ 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