29 #include "oops/instanceKlass.hpp"
30 #include "runtime/handles.hpp"
31 #include "utilities/macros.hpp"
32
33 // An InstanceMirrorKlass is a specialized InstanceKlass for
34 // java.lang.Class instances. These instances are special because
35 // they contain the static fields of the class in addition to the
36 // normal fields of Class. This means they are variable sized
37 // instances and need special logic for computing their size and for
38 // iteration of their oops.
39
40
41 class InstanceMirrorKlass: public InstanceKlass {
42 friend class VMStructs;
43 friend class InstanceKlass;
44
45 private:
46 static int _offset_of_static_fields;
47
48 // Constructor
49 InstanceMirrorKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags, bool is_anonymous)
50 : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {}
51
52 public:
53 InstanceMirrorKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
54 // Type testing
55 bool oop_is_instanceMirror() const { return true; }
56
57 // Casting from Klass*
58 static InstanceMirrorKlass* cast(Klass* k) {
59 assert(k->oop_is_instanceMirror(), "cast to InstanceMirrorKlass");
60 return (InstanceMirrorKlass*) k;
61 }
62
63 // Returns the size of the instance including the extra static fields.
64 virtual int oop_size(oop obj) const;
65
66 // Static field offset is an offset into the Heap, should be converted by
67 // based on UseCompressedOop for traversal
68 static HeapWord* start_of_static_fields(oop obj) {
69 return (HeapWord*)(cast_from_oop<intptr_t>(obj) + offset_of_static_fields());
70 }
77
78 static int offset_of_static_fields() {
79 return _offset_of_static_fields;
80 }
81
82 int compute_static_oop_field_count(oop obj);
83
84 // Given a Klass return the size of the instance
85 int instance_size(KlassHandle k);
86
87 // allocation
88 instanceOop allocate_instance(KlassHandle k, TRAPS);
89
90 // Garbage collection
91 int oop_adjust_pointers(oop obj);
92 void oop_follow_contents(oop obj);
93
94 // Parallel Scavenge and Parallel Old
95 PARALLEL_GC_DECLS
96
97 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
98 return oop_oop_iterate_v(obj, blk);
99 }
100 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
101 return oop_oop_iterate_v_m(obj, blk, mr);
102 }
103
104 #define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
105 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
106 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
107
108 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
109 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
110
111 #if INCLUDE_ALL_GCS
112 #define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
113 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
114
115 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
116 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
117 #endif // INCLUDE_ALL_GCS
118 };
119
120 #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
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29 #include "oops/instanceKlass.hpp"
30 #include "runtime/handles.hpp"
31 #include "utilities/macros.hpp"
32
33 // An InstanceMirrorKlass is a specialized InstanceKlass for
34 // java.lang.Class instances. These instances are special because
35 // they contain the static fields of the class in addition to the
36 // normal fields of Class. This means they are variable sized
37 // instances and need special logic for computing their size and for
38 // iteration of their oops.
39
40
41 class InstanceMirrorKlass: public InstanceKlass {
42 friend class VMStructs;
43 friend class InstanceKlass;
44
45 private:
46 static int _offset_of_static_fields;
47
48 // Constructor
49 InstanceMirrorKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags, bool is_anonymous);
50
51 public:
52 InstanceMirrorKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
53 // Type testing
54 bool oop_is_instanceMirror() const { return true; }
55
56 // Casting from Klass*
57 static InstanceMirrorKlass* cast(Klass* k) {
58 assert(k->oop_is_instanceMirror(), "cast to InstanceMirrorKlass");
59 return (InstanceMirrorKlass*) k;
60 }
61
62 // Returns the size of the instance including the extra static fields.
63 virtual int oop_size(oop obj) const;
64
65 // Static field offset is an offset into the Heap, should be converted by
66 // based on UseCompressedOop for traversal
67 static HeapWord* start_of_static_fields(oop obj) {
68 return (HeapWord*)(cast_from_oop<intptr_t>(obj) + offset_of_static_fields());
69 }
76
77 static int offset_of_static_fields() {
78 return _offset_of_static_fields;
79 }
80
81 int compute_static_oop_field_count(oop obj);
82
83 // Given a Klass return the size of the instance
84 int instance_size(KlassHandle k);
85
86 // allocation
87 instanceOop allocate_instance(KlassHandle k, TRAPS);
88
89 // Garbage collection
90 int oop_adjust_pointers(oop obj);
91 void oop_follow_contents(oop obj);
92
93 // Parallel Scavenge and Parallel Old
94 PARALLEL_GC_DECLS
95
96 template <bool nv, typename OopClosureType>
97 int oop_oop_iterate(oop obj, OopClosureType* blk);
98
99 template <bool nv, typename OopClosureType>
100 int oop_oop_iterate_m(oop obj, OopClosureType* blk, MemRegion mr);
101
102 #if INCLUDE_ALL_GCS
103 template <bool nv, typename OopClosureType>
104 int oop_oop_iterate_backwards(oop obj, OopClosureType* blk);
105 #endif // INCLUDE_ALL_GCS
106 };
107
108 #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
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