1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
8 *
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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 *
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23 */
24
25 #ifndef SHARE_OOPS_OBJARRAYKLASS_HPP
26 #define SHARE_OOPS_OBJARRAYKLASS_HPP
27
28 #include "oops/arrayKlass.hpp"
29 #include "utilities/macros.hpp"
30
31 class ClassLoaderData;
32
33 // ObjArrayKlass is the klass for objArrays
34
35 class ObjArrayKlass : public ArrayKlass {
36 friend class Deoptimization;
37 friend class JVMCIVMStructs;
38 friend class oopFactory;
39 friend class VMStructs;
40
41 public:
42 static const KlassKind Kind = ObjArrayKlassKind;
43
44 private:
45 // If you add a new field that points to any metaspace object, you
46 // must add this field to ObjArrayKlass::metaspace_pointers_do().
47 Klass* _element_klass; // The klass of the elements of this array type
48 Klass* _bottom_klass; // The one-dimensional type (InstanceKlass or TypeArrayKlass)
49
50 // Constructor
51 ObjArrayKlass(int n, Klass* element_klass, Symbol* name);
52 static ObjArrayKlass* allocate_klass(ClassLoaderData* loader_data, int n, Klass* k, Symbol* name, TRAPS);
53
54 objArrayOop allocate_instance(int length, TRAPS);
55
56 protected:
57 // Create array_name for element klass
58 static Symbol* create_element_klass_array_name(JavaThread* current, Klass* element_klass);
59
60 public:
61 // For dummy objects
62 ObjArrayKlass() {}
63
64 // Instance variables
65 Klass* element_klass() const { return _element_klass; }
66 void set_element_klass(Klass* k) { _element_klass = k; }
67
68 // Compiler/Interpreter offset
69 static ByteSize element_klass_offset() { return byte_offset_of(ObjArrayKlass, _element_klass); }
70
71 Klass* bottom_klass() const { return _bottom_klass; }
72 void set_bottom_klass(Klass* k) { _bottom_klass = k; }
73 Klass** bottom_klass_addr() { return &_bottom_klass; }
74
75 ModuleEntry* module() const;
76 PackageEntry* package() const;
77
78 // Dispatched operation
79 bool can_be_primary_super_slow() const;
80 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
81 Array<InstanceKlass*>* transitive_interfaces);
82 DEBUG_ONLY(bool is_objArray_klass_slow() const { return true; })
83 size_t oop_size(oop obj) const;
84
85 // Allocation
86 static ObjArrayKlass* allocate_objArray_klass(ClassLoaderData* loader_data,
87 int n, Klass* element_klass, TRAPS);
88
89 oop multi_allocate(int rank, jint* sizes, TRAPS);
90
91 // Copying
92 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
93
94 // Compute protection domain
95 oop protection_domain() const { return bottom_klass()->protection_domain(); }
96
97 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
98
99 private:
100 // Either oop or narrowOop depending on UseCompressedOops.
101 // must be called from within ObjArrayKlass.cpp
102 void do_copy(arrayOop s, size_t src_offset,
103 arrayOop d, size_t dst_offset,
104 int length, TRAPS);
105 public:
106 static ObjArrayKlass* cast(Klass* k) {
107 return const_cast<ObjArrayKlass*>(cast(const_cast<const Klass*>(k)));
108 }
109
110 static const ObjArrayKlass* cast(const Klass* k) {
111 assert(k->is_objArray_klass(), "cast to ObjArrayKlass");
112 return static_cast<const ObjArrayKlass*>(k);
113 }
114
115 // Sizing
116 static int header_size() { return sizeof(ObjArrayKlass)/wordSize; }
117 int size() const { return ArrayKlass::static_size(header_size()); }
118
119 // Initialization (virtual from Klass)
120 void initialize(TRAPS);
121
122 // Oop fields (and metadata) iterators
123 //
124 // The ObjArrayKlass iterators also visits the Object's klass.
125
126 // Iterate over oop elements and metadata.
127 template <typename T, typename OopClosureType>
128 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
129
130 // Iterate over oop elements and metadata.
131 template <typename T, typename OopClosureType>
132 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
133
134 // Iterate over oop elements within mr, and metadata.
135 template <typename T, typename OopClosureType>
136 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
137
138 // Iterate over oop elements within [start, end), and metadata.
139 template <typename T, class OopClosureType>
140 inline void oop_oop_iterate_range(objArrayOop a, OopClosureType* closure, int start, int end);
141
142 public:
143 // Iterate over all oop elements.
144 template <typename T, class OopClosureType>
145 inline void oop_oop_iterate_elements(objArrayOop a, OopClosureType* closure);
146
147 private:
148 // Iterate over all oop elements with indices within mr.
149 template <typename T, class OopClosureType>
150 inline void oop_oop_iterate_elements_bounded(objArrayOop a, OopClosureType* closure, void* low, void* high);
151
152 public:
153 u2 compute_modifier_flags() const;
154
155 public:
156 // Printing
157 void print_on(outputStream* st) const;
158 void print_value_on(outputStream* st) const;
159
160 void oop_print_value_on(oop obj, outputStream* st);
161 #ifndef PRODUCT
162 void oop_print_on (oop obj, outputStream* st);
163 #endif //PRODUCT
164
165 const char* internal_name() const;
166
167 // Verification
168 void verify_on(outputStream* st);
169
170 void oop_verify_on(oop obj, outputStream* st);
171 };
172
173 #endif // SHARE_OOPS_OBJARRAYKLASS_HPP