1 /*
2 * Copyright (c) 1997, 2010, 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.
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23 */
24
25 #ifndef SHARE_VM_OOPS_OBJARRAYKLASS_HPP
26 #define SHARE_VM_OOPS_OBJARRAYKLASS_HPP
27
28 #include "memory/specialized_oop_closures.hpp"
29 #include "oops/arrayKlass.hpp"
30 #include "oops/instanceKlass.hpp"
31
32 // objArrayKlass is the klass for objArrays
33
34 class objArrayKlass : public arrayKlass {
35 friend class VMStructs;
36 private:
37 klassOop _element_klass; // The klass of the elements of this array type
38 klassOop _bottom_klass; // The one-dimensional type (instanceKlass or typeArrayKlass)
39 public:
40 // Instance variables
41 klassOop element_klass() const { return _element_klass; }
42 void set_element_klass(klassOop k) { oop_store_without_check((oop*) &_element_klass, (oop) k); }
43 oop* element_klass_addr() { return (oop*)&_element_klass; }
44
45 klassOop bottom_klass() const { return _bottom_klass; }
46 void set_bottom_klass(klassOop k) { oop_store_without_check((oop*) &_bottom_klass, (oop) k); }
47 oop* bottom_klass_addr() { return (oop*)&_bottom_klass; }
48
49 // Compiler/Interpreter offset
50 static int element_klass_offset_in_bytes() { return sizeof(klassOopDesc) + offset_of(objArrayKlass, _element_klass); }
51
52 // Dispatched operation
53 bool can_be_primary_super_slow() const;
54 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
55 bool compute_is_subtype_of(klassOop k);
56 bool oop_is_objArray_slow() const { return true; }
57 int oop_size(oop obj) const;
58 int klass_oop_size() const { return object_size(); }
59
60 // Allocation
61 DEFINE_ALLOCATE_PERMANENT(objArrayKlass);
62 objArrayOop allocate(int length, TRAPS);
63 oop multi_allocate(int rank, jint* sizes, TRAPS);
64
65 // Copying
66 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
67
68 // Compute protection domain
69 oop protection_domain() { return Klass::cast(bottom_klass())->protection_domain(); }
70 // Compute class loader
71 oop class_loader() const { return Klass::cast(bottom_klass())->class_loader(); }
72
73 private:
74 // Either oop or narrowOop depending on UseCompressedOops.
75 // must be called from within objArrayKlass.cpp
76 template <class T> void do_copy(arrayOop s, T* src, arrayOop d,
77 T* dst, int length, TRAPS);
78 protected:
79 // Returns the objArrayKlass for n'th dimension.
80 virtual klassOop array_klass_impl(bool or_null, int n, TRAPS);
81
82 // Returns the array class with this class as element type.
83 virtual klassOop array_klass_impl(bool or_null, TRAPS);
84
85 public:
86 // Casting from klassOop
87 static objArrayKlass* cast(klassOop k) {
88 assert(k->klass_part()->oop_is_objArray_slow(), "cast to objArrayKlass");
89 return (objArrayKlass*) k->klass_part();
90 }
91
92 // Sizing
93 static int header_size() { return oopDesc::header_size() + sizeof(objArrayKlass)/HeapWordSize; }
94 int object_size() const { return arrayKlass::object_size(header_size()); }
95
96 // Initialization (virtual from Klass)
97 void initialize(TRAPS);
98
99 // Garbage collection
100 void oop_follow_contents(oop obj);
101 inline void oop_follow_contents(oop obj, int index);
102 template <class T> inline void objarray_follow_contents(oop obj, int index);
103
104 int oop_adjust_pointers(oop obj);
105
106 // Parallel Scavenge and Parallel Old
107 PARALLEL_GC_DECLS
108 #ifndef SERIALGC
109 inline void oop_follow_contents(ParCompactionManager* cm, oop obj, int index);
110 template <class T> inline void
111 objarray_follow_contents(ParCompactionManager* cm, oop obj, int index);
112 #endif // !SERIALGC
113
114 // Iterators
115 int oop_oop_iterate(oop obj, OopClosure* blk) {
116 return oop_oop_iterate_v(obj, blk);
117 }
118 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
119 return oop_oop_iterate_v_m(obj, blk, mr);
120 }
121 #define ObjArrayKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
122 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
123 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
124 MemRegion mr); \
125 int oop_oop_iterate_range##nv_suffix(oop obj, OopClosureType* blk, \
126 int start, int end);
127
128 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DECL)
129 ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DECL)
130
131 // JVM support
132 jint compute_modifier_flags(TRAPS) const;
133
134 private:
135 static klassOop array_klass_impl (objArrayKlassHandle this_oop, bool or_null, int n, TRAPS);
136
137 public:
138 // Printing
139 void oop_print_value_on(oop obj, outputStream* st);
140 #ifndef PRODUCT
141 void oop_print_on (oop obj, outputStream* st);
142 #endif //PRODUCT
143
144 // Verification
145 const char* internal_name() const;
146 void oop_verify_on(oop obj, outputStream* st);
147 void oop_verify_old_oop(oop obj, oop* p, bool allow_dirty);
148 void oop_verify_old_oop(oop obj, narrowOop* p, bool allow_dirty);
149 };
150
151 #endif // SHARE_VM_OOPS_OBJARRAYKLASS_HPP