1 /*
2 * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // objArrayKlass is the klass for objArrays
26
27 class objArrayKlass : public arrayKlass {
28 friend class VMStructs;
29 private:
30 klassOop _element_klass; // The klass of the elements of this array type
31 klassOop _bottom_klass; // The one-dimensional type (instanceKlass or typeArrayKlass)
32 public:
33 // Instance variables
34 klassOop element_klass() const { return _element_klass; }
35 void set_element_klass(klassOop k) { oop_store_without_check((oop*) &_element_klass, (oop) k); }
36 oop* element_klass_addr() { return (oop*)&_element_klass; }
37
38 klassOop bottom_klass() const { return _bottom_klass; }
39 void set_bottom_klass(klassOop k) { oop_store_without_check((oop*) &_bottom_klass, (oop) k); }
40 oop* bottom_klass_addr() { return (oop*)&_bottom_klass; }
41
42 // Compiler/Interpreter offset
43 static int element_klass_offset_in_bytes() { return offset_of(objArrayKlass, _element_klass); }
44
45 // Dispatched operation
46 bool can_be_primary_super_slow() const;
47 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
48 bool compute_is_subtype_of(klassOop k);
49 bool oop_is_objArray_slow() const { return true; }
50 int oop_size(oop obj) const;
51 int klass_oop_size() const { return object_size(); }
52
53 // Allocation
54 DEFINE_ALLOCATE_PERMANENT(objArrayKlass);
55 objArrayOop allocate(int length, TRAPS);
56 oop multi_allocate(int rank, jint* sizes, TRAPS);
57
58 // Copying
59 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
60
61 // Compute protection domain
62 oop protection_domain() { return Klass::cast(bottom_klass())->protection_domain(); }
63 // Compute class loader
64 oop class_loader() const { return Klass::cast(bottom_klass())->class_loader(); }
65
66 private:
67 // Either oop or narrowOop depending on UseCompressedOops.
68 // must be called from within objArrayKlass.cpp
69 template <class T> void do_copy(arrayOop s, T* src, arrayOop d,
70 T* dst, int length, TRAPS);
71 protected:
72 // Returns the objArrayKlass for n'th dimension.
73 virtual klassOop array_klass_impl(bool or_null, int n, TRAPS);
74
75 // Returns the array class with this class as element type.
76 virtual klassOop array_klass_impl(bool or_null, TRAPS);
77
78 public:
79 // Casting from klassOop
80 static objArrayKlass* cast(klassOop k) {
81 assert(k->klass_part()->oop_is_objArray_slow(), "cast to objArrayKlass");
82 return (objArrayKlass*) k->klass_part();
83 }
84
85 // Sizing
86 static int header_size() { return oopDesc::header_size() + sizeof(objArrayKlass)/HeapWordSize; }
87 int object_size() const { return arrayKlass::object_size(header_size()); }
88
89 // Initialization (virtual from Klass)
90 void initialize(TRAPS);
91
92 // Garbage collection
93 void oop_follow_contents(oop obj);
94 inline void oop_follow_contents(oop obj, int index);
95 template <class T> inline void objarray_follow_contents(oop obj, int index);
96
97 int oop_adjust_pointers(oop obj);
98
99 // Parallel Scavenge and Parallel Old
100 PARALLEL_GC_DECLS
101 #ifndef SERIALGC
102 inline void oop_follow_contents(ParCompactionManager* cm, oop obj, int index);
103 template <class T> inline void
104 objarray_follow_contents(ParCompactionManager* cm, oop obj, int index);
105 #endif // !SERIALGC
106
107 // Iterators
108 int oop_oop_iterate(oop obj, OopClosure* blk) {
109 return oop_oop_iterate_v(obj, blk);
110 }
111 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
112 return oop_oop_iterate_v_m(obj, blk, mr);
113 }
114 #define ObjArrayKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
115 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
116 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
117 MemRegion mr); \
118 int oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* blk, \
119 int start, int end);
120
121 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DECL)
122 ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DECL)
123
124 // JVM support
125 jint compute_modifier_flags(TRAPS) const;
126
127 private:
128 static klassOop array_klass_impl (objArrayKlassHandle this_oop, bool or_null, int n, TRAPS);
129
130 public:
131 // Printing
132 void oop_print_value_on(oop obj, outputStream* st);
133 #ifndef PRODUCT
134 void oop_print_on (oop obj, outputStream* st);
135 #endif //PRODUCT
136
137 // Verification
138 const char* internal_name() const;
139 void oop_verify_on(oop obj, outputStream* st);
140 void oop_verify_old_oop(oop obj, oop* p, bool allow_dirty);
141 void oop_verify_old_oop(oop obj, narrowOop* p, bool allow_dirty);
142 };