29 #include "metaprogramming/primitiveConversions.hpp"
30 #include "utilities/globalDefinitions.hpp"
31
32 // OBJECT hierarchy
33 // This hierarchy is a representation hierarchy, i.e. if A is a superclass
34 // of B, A's representation is a prefix of B's representation.
35
36 // Global offset instead of address for an oop within a java object.
37 enum class narrowOop : uint32_t { null = 0 };
38
39 typedef void* OopOrNarrowOopStar;
40
41 #ifndef CHECK_UNHANDLED_OOPS
42
43 typedef class oopDesc* oop;
44 typedef class instanceOopDesc* instanceOop;
45 typedef class stackChunkOopDesc* stackChunkOop;
46 typedef class arrayOopDesc* arrayOop;
47 typedef class objArrayOopDesc* objArrayOop;
48 typedef class typeArrayOopDesc* typeArrayOop;
49
50 #else
51
52 // When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a
53 // carefully chosen set of constructors and conversion operators to go
54 // to and from the underlying oopDesc pointer type.
55 //
56 // Because oop and its subclasses <type>Oop are class types, arbitrary
57 // conversions are not accepted by the compiler. Applying a cast to
58 // an oop will cause the best matched conversion operator to be
59 // invoked returning the underlying oopDesc* type if appropriate.
60 // No copy constructors, explicit user conversions or operators of
61 // numerical type should be defined within the oop class. Most C++
62 // compilers will issue a compile time error concerning the overloading
63 // ambiguity between operators of numerical and pointer types. If
64 // a conversion to or from an oop to a numerical type is needed,
65 // use the inline template methods, cast_*_oop, defined below.
66 //
67 // Converting null to oop to Handle implicit is no longer accepted by the
68 // compiler because there are too many steps in the conversion. Use Handle()
137 type##Oop& operator=(const type##Oop& o) { \
138 oop::operator=(o); \
139 return *this; \
140 } \
141 }; \
142 \
143 template<> \
144 struct PrimitiveConversions::Translate<type##Oop> : public std::true_type { \
145 typedef type##Oop Value; \
146 typedef type##OopDesc* Decayed; \
147 \
148 static Decayed decay(Value x) { return (type##OopDesc*)x.obj(); } \
149 static Value recover(Decayed x) { return type##Oop(x); } \
150 };
151
152 DEF_OOP(instance);
153 DEF_OOP(stackChunk);
154 DEF_OOP(array);
155 DEF_OOP(objArray);
156 DEF_OOP(typeArray);
157
158 #endif // CHECK_UNHANDLED_OOPS
159
160 // Cast functions to convert to and from oops.
161 template <typename T> inline oop cast_to_oop(T value) {
162 return (oopDesc*)value;
163 }
164 template <typename T> inline T cast_from_oop(oop o) {
165 return (T)(CHECK_UNHANDLED_OOPS_ONLY((oopDesc*))o);
166 }
167
168 inline intptr_t p2i(narrowOop o) {
169 return static_cast<intptr_t>(o);
170 }
171
172 // The metadata hierarchy is separate from the oop hierarchy
173
174 // class MetaspaceObj
175 class ConstMethod;
176 class ConstantPoolCache;
177 class MethodData;
178 // class Metadata
179 class Method;
180 class ConstantPool;
181
182 // The klass hierarchy is separate from the oop hierarchy.
183
184 class Klass;
185 class InstanceKlass;
186 class InstanceMirrorKlass;
187 class InstanceClassLoaderKlass;
188 class InstanceRefKlass;
189 class InstanceStackChunkKlass;
190 class ArrayKlass;
191 class ObjArrayKlass;
192 class TypeArrayKlass;
193
194 #endif // SHARE_OOPS_OOPSHIERARCHY_HPP
|
29 #include "metaprogramming/primitiveConversions.hpp"
30 #include "utilities/globalDefinitions.hpp"
31
32 // OBJECT hierarchy
33 // This hierarchy is a representation hierarchy, i.e. if A is a superclass
34 // of B, A's representation is a prefix of B's representation.
35
36 // Global offset instead of address for an oop within a java object.
37 enum class narrowOop : uint32_t { null = 0 };
38
39 typedef void* OopOrNarrowOopStar;
40
41 #ifndef CHECK_UNHANDLED_OOPS
42
43 typedef class oopDesc* oop;
44 typedef class instanceOopDesc* instanceOop;
45 typedef class stackChunkOopDesc* stackChunkOop;
46 typedef class arrayOopDesc* arrayOop;
47 typedef class objArrayOopDesc* objArrayOop;
48 typedef class typeArrayOopDesc* typeArrayOop;
49 typedef class flatArrayOopDesc* flatArrayOop;
50 typedef class refArrayOopDesc* refArrayOop;
51
52 #else
53
54 // When CHECK_UNHANDLED_OOPS is defined, an "oop" is a class with a
55 // carefully chosen set of constructors and conversion operators to go
56 // to and from the underlying oopDesc pointer type.
57 //
58 // Because oop and its subclasses <type>Oop are class types, arbitrary
59 // conversions are not accepted by the compiler. Applying a cast to
60 // an oop will cause the best matched conversion operator to be
61 // invoked returning the underlying oopDesc* type if appropriate.
62 // No copy constructors, explicit user conversions or operators of
63 // numerical type should be defined within the oop class. Most C++
64 // compilers will issue a compile time error concerning the overloading
65 // ambiguity between operators of numerical and pointer types. If
66 // a conversion to or from an oop to a numerical type is needed,
67 // use the inline template methods, cast_*_oop, defined below.
68 //
69 // Converting null to oop to Handle implicit is no longer accepted by the
70 // compiler because there are too many steps in the conversion. Use Handle()
139 type##Oop& operator=(const type##Oop& o) { \
140 oop::operator=(o); \
141 return *this; \
142 } \
143 }; \
144 \
145 template<> \
146 struct PrimitiveConversions::Translate<type##Oop> : public std::true_type { \
147 typedef type##Oop Value; \
148 typedef type##OopDesc* Decayed; \
149 \
150 static Decayed decay(Value x) { return (type##OopDesc*)x.obj(); } \
151 static Value recover(Decayed x) { return type##Oop(x); } \
152 };
153
154 DEF_OOP(instance);
155 DEF_OOP(stackChunk);
156 DEF_OOP(array);
157 DEF_OOP(objArray);
158 DEF_OOP(typeArray);
159 DEF_OOP(flatArray);
160 DEF_OOP(refArray);
161
162 #endif // CHECK_UNHANDLED_OOPS
163
164 // Cast functions to convert to and from oops.
165 template <typename T> inline oop cast_to_oop(T value) {
166 return (oopDesc*)value;
167 }
168 template <typename T> inline T cast_from_oop(oop o) {
169 return (T)(CHECK_UNHANDLED_OOPS_ONLY((oopDesc*))o);
170 }
171
172 inline intptr_t p2i(narrowOop o) {
173 return static_cast<intptr_t>(o);
174 }
175
176 // The metadata hierarchy is separate from the oop hierarchy
177
178 // class MetaspaceObj
179 class ConstMethod;
180 class ConstantPoolCache;
181 class MethodData;
182 // class Metadata
183 class Method;
184 class ConstantPool;
185
186 // The klass hierarchy is separate from the oop hierarchy.
187
188 class Klass;
189 class InstanceKlass;
190 class InlineKlass;
191 class InstanceMirrorKlass;
192 class InstanceClassLoaderKlass;
193 class InstanceRefKlass;
194 class InstanceStackChunkKlass;
195 class ArrayKlass;
196 class ObjArrayKlass;
197 class TypeArrayKlass;
198 class FlatArrayKlass;
199
200 #endif // SHARE_OOPS_OOPSHIERARCHY_HPP
|