1 /*
2 * Copyright (c) 2025, 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
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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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16 * 2 along with this work; if not, write to the Free Software Foundation,
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23 */
24
25 #ifndef SHARE_OOPS_REFARRAYKLASS_HPP
26 #define SHARE_OOPS_REFARRAYKLASS_HPP
27
28 #include "oops/arrayKlass.hpp"
29 #include "oops/objArrayKlass.hpp"
30 #include "utilities/macros.hpp"
31
32 class ClassLoaderData;
33
34 // RefArrayKlass is the klass for arrays of references
35
36 class RefArrayKlass : public ObjArrayKlass {
37 friend class Deoptimization;
38 friend class oopFactory;
39 friend class VMStructs;
40 friend class JVMCIVMStructs;
41
42 public:
43 static const KlassKind Kind = RefArrayKlassKind;
44
45 private:
46 // Constructor
47 RefArrayKlass(int n, Klass* element_klass, Symbol* name, ArrayKlass::ArrayProperties props);
48 static RefArrayKlass* allocate_klass(ClassLoaderData* loader_data, int n, Klass* k, Symbol* name,
49 ArrayKlass::ArrayProperties props, TRAPS);
50
51 public:
52 // For dummy objects
53 RefArrayKlass() {}
54
55 // Dispatched operation
56 DEBUG_ONLY(bool is_refArray_klass_slow() const { return true; })
57 size_t oop_size(oop obj) const; // TODO FIXME make it virtual in objArrayKlass
58
59 // Allocation
60 static RefArrayKlass* allocate_refArray_klass(ClassLoaderData* loader_data,
61 int n, Klass* element_klass,
62 ArrayKlass::ArrayProperties props, TRAPS);
63
64 private:
65 objArrayOop allocate_instance(int length, ArrayProperties props, TRAPS);
66
67 public:
68 // Copying TODO FIXME make copying method in objArrayKlass virtual and default implementation invalid (ShouldNotReachHere())
69 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
70
71 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
72
73 private:
74 // Either oop or narrowOop depending on UseCompressedOops.
75 // must be called from within ObjArrayKlass.cpp
76 void do_copy(arrayOop s, size_t src_offset,
77 arrayOop d, size_t dst_offset,
78 int length, TRAPS);
79
80 public:
81 static RefArrayKlass *cast(Klass* k) {
82 assert(k->is_refArray_klass(), "cast to RefArrayKlass");
83 return const_cast<RefArrayKlass *>(cast(const_cast<const Klass *>(k)));
84 }
85
86 static const RefArrayKlass *cast(const Klass* k) {
87 assert(k->is_refArray_klass(), "cast to RefArrayKlass");
88 return static_cast<const RefArrayKlass *>(k);
89 }
90
91 // Sizing
92 static int header_size() { return sizeof(RefArrayKlass) / wordSize; }
93 int size() const { return ArrayKlass::static_size(header_size()); }
94
95 // Initialization (virtual from Klass)
96 void initialize(TRAPS);
97
98 // Oop fields (and metadata) iterators
99 //
100 // The RefArrayKlass iterators also visits the Object's klass.
101
102 // Iterate over oop elements and metadata.
103 template <typename T, typename OopClosureType>
104 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
105
106 // Iterate over oop elements and metadata.
107 template <typename T, typename OopClosureType>
108 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
109
110 // Iterate over oop elements within mr, and metadata.
111 template <typename T, typename OopClosureType>
112 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
113
114 // Iterate over oop elements within [start, end), and metadata.
115 template <typename T, class OopClosureType>
116 inline void oop_oop_iterate_range(refArrayOop a, OopClosureType* closure, int start, int end);
117
118 public:
119 // Iterate over all oop elements.
120 template <typename T, class OopClosureType>
121 inline void oop_oop_iterate_elements(refArrayOop a, OopClosureType* closure);
122
123 private:
124 // Iterate over all oop elements with indices within mr.
125 template <typename T, class OopClosureType>
126 inline void oop_oop_iterate_elements_bounded(refArrayOop a, OopClosureType* closure, void* low, void* high);
127
128 public:
129 // Printing
130 void print_on(outputStream* st) const;
131 void print_value_on(outputStream* st) const;
132
133 void oop_print_value_on(oop obj, outputStream* st);
134 #ifndef PRODUCT
135 void oop_print_on(oop obj, outputStream* st);
136 #endif // PRODUCT
137
138 // Verification
139 void verify_on(outputStream* st);
140
141 void oop_verify_on(oop obj, outputStream* st);
142 };
143
144 #endif // SHARE_OOPS_REFARRAYKLASS_HPP