32
33 // OBJECT hierarchy
34 // This hierarchy is a representation hierarchy, i.e. if A is a superclass
35 // of B, A's representation is a prefix of B's representation.
36
37 typedef juint narrowOop; // Offset instead of address for an oop within a java object
38
39 // If compressed klass pointers then use narrowKlass.
40 typedef juint narrowKlass;
41
42 typedef void* OopOrNarrowOopStar;
43 typedef class markOopDesc* markOop;
44
45 #ifndef CHECK_UNHANDLED_OOPS
46
47 typedef class oopDesc* oop;
48 typedef class instanceOopDesc* instanceOop;
49 typedef class arrayOopDesc* arrayOop;
50 typedef class objArrayOopDesc* objArrayOop;
51 typedef class typeArrayOopDesc* typeArrayOop;
52
53 #else
54
55 // When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a
56 // carefully chosen set of constructors and conversion operators to go
57 // to and from the underlying oopDesc pointer type.
58 //
59 // Because oop and its subclasses <type>Oop are class types, arbitrary
60 // conversions are not accepted by the compiler. Applying a cast to
61 // an oop will cause the best matched conversion operator to be
62 // invoked returning the underlying oopDesc* type if appropriate.
63 // No copy constructors, explicit user conversions or operators of
64 // numerical type should be defined within the oop class. Most C++
65 // compilers will issue a compile time error concerning the overloading
66 // ambiguity between operators of numerical and pointer types. If
67 // a conversion to or from an oop to a numerical type is needed,
68 // use the inline template methods, cast_*_oop, defined below.
69 //
70 // Converting NULL to oop to Handle implicit is no longer accepted by the
71 // compiler because there are too many steps in the conversion. Use Handle()
162 } \
163 volatile type##Oop& operator=(const volatile type##Oop& o) volatile {\
164 (void)const_cast<oop&>(oop::operator=(o)); \
165 return *this; \
166 } \
167 }; \
168 \
169 template<> \
170 struct PrimitiveConversions::Translate<type##Oop> : public TrueType { \
171 typedef type##Oop Value; \
172 typedef type##OopDesc* Decayed; \
173 \
174 static Decayed decay(Value x) { return (type##OopDesc*)x.obj(); } \
175 static Value recover(Decayed x) { return type##Oop(x); } \
176 };
177
178 DEF_OOP(instance);
179 DEF_OOP(array);
180 DEF_OOP(objArray);
181 DEF_OOP(typeArray);
182
183 #endif // CHECK_UNHANDLED_OOPS
184
185 // For CHECK_UNHANDLED_OOPS, it is ambiguous C++ behavior to have the oop
186 // structure contain explicit user defined conversions of both numerical
187 // and pointer type. Define inline methods to provide the numerical conversions.
188 template <class T> inline oop cast_to_oop(T value) {
189 return (oop)(CHECK_UNHANDLED_OOPS_ONLY((void *))(value));
190 }
191 template <class T> inline T cast_from_oop(oop o) {
192 return (T)(CHECK_UNHANDLED_OOPS_ONLY((void*))o);
193 }
194
195 inline bool check_obj_alignment(oop obj) {
196 return (cast_from_oop<intptr_t>(obj) & MinObjAlignmentInBytesMask) == 0;
197 }
198
199 // The metadata hierarchy is separate from the oop hierarchy
200
201 // class MetaspaceObj
202 class ConstMethod;
203 class ConstantPoolCache;
204 class MethodData;
205 // class Metadata
206 class Method;
207 class ConstantPool;
208 // class CHeapObj
209 class CompiledICHolder;
210
211
212 // The klass hierarchy is separate from the oop hierarchy.
213
214 class Klass;
215 class InstanceKlass;
216 class InstanceMirrorKlass;
217 class InstanceClassLoaderKlass;
218 class InstanceRefKlass;
219 class ArrayKlass;
220 class ObjArrayKlass;
221 class TypeArrayKlass;
222
223 #endif // SHARE_OOPS_OOPSHIERARCHY_HPP
|
32
33 // OBJECT hierarchy
34 // This hierarchy is a representation hierarchy, i.e. if A is a superclass
35 // of B, A's representation is a prefix of B's representation.
36
37 typedef juint narrowOop; // Offset instead of address for an oop within a java object
38
39 // If compressed klass pointers then use narrowKlass.
40 typedef juint narrowKlass;
41
42 typedef void* OopOrNarrowOopStar;
43 typedef class markOopDesc* markOop;
44
45 #ifndef CHECK_UNHANDLED_OOPS
46
47 typedef class oopDesc* oop;
48 typedef class instanceOopDesc* instanceOop;
49 typedef class arrayOopDesc* arrayOop;
50 typedef class objArrayOopDesc* objArrayOop;
51 typedef class typeArrayOopDesc* typeArrayOop;
52 typedef class valueArrayOopDesc* valueArrayOop;
53
54 #else
55
56 // When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a
57 // carefully chosen set of constructors and conversion operators to go
58 // to and from the underlying oopDesc pointer type.
59 //
60 // Because oop and its subclasses <type>Oop are class types, arbitrary
61 // conversions are not accepted by the compiler. Applying a cast to
62 // an oop will cause the best matched conversion operator to be
63 // invoked returning the underlying oopDesc* type if appropriate.
64 // No copy constructors, explicit user conversions or operators of
65 // numerical type should be defined within the oop class. Most C++
66 // compilers will issue a compile time error concerning the overloading
67 // ambiguity between operators of numerical and pointer types. If
68 // a conversion to or from an oop to a numerical type is needed,
69 // use the inline template methods, cast_*_oop, defined below.
70 //
71 // Converting NULL to oop to Handle implicit is no longer accepted by the
72 // compiler because there are too many steps in the conversion. Use Handle()
163 } \
164 volatile type##Oop& operator=(const volatile type##Oop& o) volatile {\
165 (void)const_cast<oop&>(oop::operator=(o)); \
166 return *this; \
167 } \
168 }; \
169 \
170 template<> \
171 struct PrimitiveConversions::Translate<type##Oop> : public TrueType { \
172 typedef type##Oop Value; \
173 typedef type##OopDesc* Decayed; \
174 \
175 static Decayed decay(Value x) { return (type##OopDesc*)x.obj(); } \
176 static Value recover(Decayed x) { return type##Oop(x); } \
177 };
178
179 DEF_OOP(instance);
180 DEF_OOP(array);
181 DEF_OOP(objArray);
182 DEF_OOP(typeArray);
183 DEF_OOP(valueArray);
184
185 #endif // CHECK_UNHANDLED_OOPS
186
187 // For CHECK_UNHANDLED_OOPS, it is ambiguous C++ behavior to have the oop
188 // structure contain explicit user defined conversions of both numerical
189 // and pointer type. Define inline methods to provide the numerical conversions.
190 template <class T> inline oop cast_to_oop(T value) {
191 return (oop)(CHECK_UNHANDLED_OOPS_ONLY((void *))(value));
192 }
193 template <class T> inline T cast_from_oop(oop o) {
194 return (T)(CHECK_UNHANDLED_OOPS_ONLY((void*))o);
195 }
196
197 inline bool check_obj_alignment(oop obj) {
198 return (cast_from_oop<intptr_t>(obj) & MinObjAlignmentInBytesMask) == 0;
199 }
200
201 // The metadata hierarchy is separate from the oop hierarchy
202
203 // class MetaspaceObj
204 class ConstMethod;
205 class ConstantPoolCache;
206 class MethodData;
207 // class Metadata
208 class Method;
209 class ConstantPool;
210 // class CHeapObj
211 class CompiledICHolder;
212
213
214 // The klass hierarchy is separate from the oop hierarchy.
215
216 class Klass;
217 class InstanceKlass;
218 class InstanceMirrorKlass;
219 class InstanceClassLoaderKlass;
220 class InstanceRefKlass;
221 class ValueKlass;
222 class ArrayKlass;
223 class ObjArrayKlass;
224 class TypeArrayKlass;
225 class ValueArrayKlass;
226
227 #endif // SHARE_OOPS_OOPSHIERARCHY_HPP
|