1 /*
2 * Copyright (c) 1997, 2018, 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 #ifndef SHARE_VM_OOPS_TYPEARRAYKLASS_HPP
26 #define SHARE_VM_OOPS_TYPEARRAYKLASS_HPP
27
28 #include "classfile/classLoaderData.hpp"
29 #include "oops/arrayKlass.hpp"
30
31 // A TypeArrayKlass is the klass of a typeArray
32 // It contains the type and size of the elements
33
34 class TypeArrayKlass : public ArrayKlass {
35 friend class VMStructs;
36
37 public:
38 static const KlassID ID = TypeArrayKlassID;
39
40 private:
41 jint _max_length; // maximum number of elements allowed in an array
42
43 // Constructor
44 TypeArrayKlass(BasicType type, Symbol* name);
45 static TypeArrayKlass* allocate(ClassLoaderData* loader_data, BasicType type, Symbol* name, TRAPS);
46 public:
47 TypeArrayKlass() {} // For dummy objects.
48
49 // instance variables
50 jint max_length() { return _max_length; }
51 void set_max_length(jint m) { _max_length = m; }
52
53 // testers
54 DEBUG_ONLY(bool is_typeArray_klass_slow() const { return true; })
55
56 // klass allocation
57 static TypeArrayKlass* create_klass(BasicType type, const char* name_str,
58 TRAPS);
59 static TypeArrayKlass* create_klass(BasicType type, TRAPS) {
60 return create_klass(type, external_name(type), THREAD);
61 }
62
63 int oop_size(oop obj) const;
64
65 bool compute_is_subtype_of(Klass* k);
66
67 // Allocation
68 typeArrayOop allocate_common(int length, bool do_zero, TRAPS);
69 typeArrayOop allocate(int length, TRAPS) { return allocate_common(length, true, THREAD); }
70 oop multi_allocate(int rank, jint* sizes, TRAPS);
71
72 oop protection_domain() const { return NULL; }
73
74 // Copying
75 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
76
77 // GC specific object visitors
78 //
79
80 #if INCLUDE_PARALLELGC
81 // Parallel Compact
82 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
83 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
84 #endif
85
86 // Oop iterators. Since there are no oops in TypeArrayKlasses,
87 // these functions only return the size of the object.
88
89 private:
90 // The implementation used by all oop_oop_iterate functions in TypeArrayKlasses.
91 inline void oop_oop_iterate_impl(oop obj, OopIterateClosure* closure);
92
93 public:
94 // Wraps oop_oop_iterate_impl to conform to macros.
95 template <typename T, typename OopClosureType>
96 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
97
98 // Wraps oop_oop_iterate_impl to conform to macros.
99 template <typename T, typename OopClosureType>
100 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
101
102 // Wraps oop_oop_iterate_impl to conform to macros.
103 template <typename T, typename OopClosureType>
104 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
105
106 protected:
107 // Find n'th dimensional array
108 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
109
110 // Returns the array class with this class as element type
111 virtual Klass* array_klass_impl(bool or_null, TRAPS);
112
113 public:
114 static TypeArrayKlass* cast(Klass* k) {
115 return const_cast<TypeArrayKlass*>(cast(const_cast<const Klass*>(k)));
116 }
117
118 static const TypeArrayKlass* cast(const Klass* k) {
119 assert(k->is_typeArray_klass(), "cast to TypeArrayKlass");
120 return static_cast<const TypeArrayKlass*>(k);
121 }
122
123 // Naming
124 static const char* external_name(BasicType type);
125
126 // Sizing
127 static int header_size() { return sizeof(TypeArrayKlass)/wordSize; }
128 int size() const { return ArrayKlass::static_size(header_size()); }
129
130 // Initialization (virtual from Klass)
131 void initialize(TRAPS);
132
133 public:
134 // Printing
135 #ifndef PRODUCT
136 void oop_print_on(oop obj, outputStream* st);
137 #endif
138
139 void print_on(outputStream* st) const;
140 void print_value_on(outputStream* st) const;
141
142 public:
143 const char* internal_name() const;
144
145 ModuleEntry* module() const;
146 PackageEntry* package() const;
147 };
148
149 #endif // SHARE_VM_OOPS_TYPEARRAYKLASS_HPP