1 /*
2 * Copyright (c) 1997, 2014, 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 "classfile/classLoaderData.hpp"
29 #include "oops/arrayKlass.hpp"
30 #include "utilities/macros.hpp"
31
32 // ObjArrayKlass is the klass for objArrays
33
34 class ObjArrayKlass : public ArrayKlass {
35 friend class VMStructs;
36 private:
37 Klass* _element_klass; // The klass of the elements of this array type
38 Klass* _bottom_klass; // The one-dimensional type (InstanceKlass or TypeArrayKlass)
39
40 // Constructor
41 ObjArrayKlass(int n, KlassHandle element_klass, Symbol* name);
42 static ObjArrayKlass* allocate(ClassLoaderData* loader_data, int n, KlassHandle klass_handle, Symbol* name, TRAPS);
43 public:
44 // For dummy objects
45 ObjArrayKlass() {}
46
47 // Instance variables
48 Klass* element_klass() const { return _element_klass; }
49 void set_element_klass(Klass* k) { _element_klass = k; }
50 Klass** element_klass_addr() { return &_element_klass; }
51
52 Klass* bottom_klass() const { return _bottom_klass; }
53 void set_bottom_klass(Klass* k) { _bottom_klass = k; }
54 Klass** bottom_klass_addr() { return &_bottom_klass; }
55
56 // Compiler/Interpreter offset
57 static ByteSize element_klass_offset() { return in_ByteSize(offset_of(ObjArrayKlass, _element_klass)); }
58
59 // Dispatched operation
60 bool can_be_primary_super_slow() const;
61 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
62 bool compute_is_subtype_of(Klass* k);
63 bool oop_is_objArray_slow() const { return true; }
64 int oop_size(oop obj) const;
65
66 // Allocation
67 static Klass* allocate_objArray_klass(ClassLoaderData* loader_data,
68 int n, KlassHandle element_klass, TRAPS);
69
70 objArrayOop allocate(int length, TRAPS);
71 oop multi_allocate(int rank, jint* sizes, TRAPS);
72
73 // Copying
74 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
75
76 // Compute protection domain
77 oop protection_domain() const { return bottom_klass()->protection_domain(); }
78
79 private:
80 // Either oop or narrowOop depending on UseCompressedOops.
81 // must be called from within ObjArrayKlass.cpp
82 template <class T> void do_copy(arrayOop s, T* src, arrayOop d,
83 T* dst, int length, TRAPS);
84 protected:
85 // Returns the ObjArrayKlass for n'th dimension.
86 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
87
88 // Returns the array class with this class as element type.
89 virtual Klass* array_klass_impl(bool or_null, TRAPS);
90
91 public:
92 // Casting from Klass*
93 static ObjArrayKlass* cast(Klass* k) {
94 assert(k->oop_is_objArray(), "cast to ObjArrayKlass");
95 return (ObjArrayKlass*) k;
96 }
97
98 // Sizing
99 static int header_size() { return sizeof(ObjArrayKlass)/HeapWordSize; }
100 int size() const { return ArrayKlass::static_size(header_size()); }
101
102 // Initialization (virtual from Klass)
103 void initialize(TRAPS);
104
105 // GC specific object visitors
106 //
107 // Mark Sweep
108 void oop_ms_follow_contents(oop obj);
109 int oop_ms_adjust_pointers(oop obj);
110 #if INCLUDE_ALL_GCS
111 // Parallel Scavenge
112 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
113 // Parallel Compact
114 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
115 void oop_pc_update_pointers(oop obj);
116 #endif
117
118 // Oop fields (and metadata) iterators
119 // [nv = true] Use non-virtual calls to do_oop_nv.
120 // [nv = false] Use virtual calls to do_oop.
121 //
122 // The ObjArrayKlass iterators also visits the Object's klass.
123
124 private:
125
126 // Iterate over oop elements and metadata.
127 template <bool nv, typename OopClosureType>
128 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
129
130 // Iterate over oop elements within mr, and metadata.
131 template <bool nv, typename OopClosureType>
132 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
133
134 // Iterate over oop elements with indices within [start, end), and metadata.
135 template <bool nv, class OopClosureType>
136 inline int oop_oop_iterate_range(oop obj, OopClosureType* closure, int start, int end);
137
138 // Iterate over oop elements within [start, end), and metadata.
139 // Specialized for [T = oop] or [T = narrowOop].
140 template <bool nv, typename T, class OopClosureType>
141 inline void oop_oop_iterate_range_specialized(objArrayOop a, OopClosureType* closure, int start, int end);
142
143 public:
144 // Iterate over all oop elements.
145 template <bool nv, class OopClosureType>
146 inline void oop_oop_iterate_elements(objArrayOop a, OopClosureType* closure);
147
148 private:
149 // Iterate over all oop elements.
150 // Specialized for [T = oop] or [T = narrowOop].
151 template <bool nv, typename T, class OopClosureType>
152 inline void oop_oop_iterate_elements_specialized(objArrayOop a, OopClosureType* closure);
153
154 // Iterate over all oop elements with indices within mr.
155 template <bool nv, class OopClosureType>
156 inline void oop_oop_iterate_elements_bounded(objArrayOop a, OopClosureType* closure, MemRegion mr);
157
158 // Iterate over oop elements within [low, high)..
159 // Specialized for [T = oop] or [T = narrowOop].
160 template <bool nv, typename T, class OopClosureType>
161 inline void oop_oop_iterate_elements_specialized_bounded(objArrayOop a, OopClosureType* closure, void* low, void* high);
162
163
164 public:
165
166 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
167 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
168 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_RANGE_DECL)
169 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_RANGE_DECL)
170
171 #if INCLUDE_ALL_GCS
172 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_NO_BACKWARDS_DECL)
173 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_NO_BACKWARDS_DECL)
174 #endif // INCLUDE_ALL_GCS
175
176 // JVM support
177 jint compute_modifier_flags(TRAPS) const;
178
179 public:
180 // Printing
181 void print_on(outputStream* st) const;
182 void print_value_on(outputStream* st) const;
183
184 void oop_print_value_on(oop obj, outputStream* st);
185 #ifndef PRODUCT
186 void oop_print_on (oop obj, outputStream* st);
187 #endif //PRODUCT
188
189 const char* internal_name() const;
190
191 // Verification
192 void verify_on(outputStream* st);
193
194 void oop_verify_on(oop obj, outputStream* st);
195 };
196
197 #endif // SHARE_VM_OOPS_OBJARRAYKLASS_HPP