1 /*
2 * Copyright (c) 2017, 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
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_FLATARRAYKLASS_HPP
26 #define SHARE_VM_OOPS_FLATARRAYKLASS_HPP
27
28 #include "classfile/classLoaderData.hpp"
29 #include "oops/arrayKlass.hpp"
30 #include "oops/inlineKlass.hpp"
31 #include "utilities/macros.hpp"
32
33 /**
34 * Array of inline types, gives a layout of typeArrayOop, but needs oops iterators
35 */
36 class FlatArrayKlass : public ArrayKlass {
37 friend class VMStructs;
38
39 public:
40 static const KlassKind Kind = FlatArrayKlassKind;
41
42 private:
43 // Constructor
44 FlatArrayKlass(Klass* element_klass, Symbol* name, LayoutKind lk);
45
46 LayoutKind _layout_kind;
47
48 public:
49
50 FlatArrayKlass() {} // used by CppVtableCloner<T>::initialize()
51
52 InlineKlass* element_klass() const { return InlineKlass::cast(_element_klass); }
53 void set_element_klass(Klass* k) { _element_klass = k; }
54
55 LayoutKind layout_kind() const { return _layout_kind; }
56 void set_layout_kind(LayoutKind lk) { _layout_kind = lk; }
57 static ByteSize layout_kind_offset() { return in_ByteSize(offset_of(FlatArrayKlass, _layout_kind)); }
58
59 // Casting from Klass*
60 static FlatArrayKlass* cast(Klass* k) {
61 assert(k->is_flatArray_klass(), "cast to FlatArrayKlass");
62 return (FlatArrayKlass*) k;
63 }
64
65 // klass allocation
66 static FlatArrayKlass* allocate_klass(Klass* element_klass, LayoutKind lk, TRAPS);
67
68 void initialize(TRAPS);
69
70 ModuleEntry* module() const;
71 PackageEntry* package() const;
72
73 bool can_be_primary_super_slow() const;
74 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
75 Array<InstanceKlass*>* transitive_interfaces);
76
77 int element_byte_size() const { return 1 << layout_helper_log2_element_size(_layout_helper); }
78
79 bool is_flatArray_klass_slow() const { return true; }
80
81 bool contains_oops() {
82 return element_klass()->contains_oops();
83 }
84
85 // Override.
86 bool element_access_must_be_atomic() {
87 return element_klass()->must_be_atomic();
88 }
89
90 oop protection_domain() const;
91
92 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
93
94 static jint array_layout_helper(InlineKlass* vklass, LayoutKind lk); // layout helper for values
95
96 // sizing
97 static int header_size() { return sizeof(FlatArrayKlass)/HeapWordSize; }
98 int size() const { return ArrayKlass::static_size(header_size()); }
99
100 jint max_elements() const;
101
102 size_t oop_size(oop obj) const;
103
104 // Oop Allocation
105 flatArrayOop allocate(int length, LayoutKind lk, TRAPS);
106 oop multi_allocate(int rank, jint* sizes, TRAPS);
107
108 // Naming
109 const char* internal_name() const { return external_name(); }
110
111 // Copying
112 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
113
114 // GC specific object visitors
115 //
116 // Mark Sweep
117 int oop_ms_adjust_pointers(oop obj);
118
119
120 template <typename T, typename OopClosureType>
121 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
122
123 template <typename T, typename OopClosureType>
124 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
125
126 template <typename T, typename OopClosureType>
127 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
128
129 template <typename T, class OopClosureType>
130 inline void oop_oop_iterate_elements(flatArrayOop a, OopClosureType* closure);
131
132 private:
133 template <typename T, class OopClosureType>
134 inline void oop_oop_iterate_elements_specialized(flatArrayOop a, OopClosureType* closure);
135
136 template <typename T, class OopClosureType>
137 inline void oop_oop_iterate_elements_bounded(flatArrayOop a, OopClosureType* closure, MemRegion mr);
138
139 template <typename T, class OopClosureType>
140 inline void oop_oop_iterate_elements_specialized_bounded(flatArrayOop a, OopClosureType* closure, void* low, void* high);
141
142 public:
143 u2 compute_modifier_flags() const;
144
145 // Printing
146 void print_on(outputStream* st) const;
147 void print_value_on(outputStream* st) const;
148
149 void oop_print_value_on(oop obj, outputStream* st);
150 #ifndef PRODUCT
151 void oop_print_on(oop obj, outputStream* st);
152 #endif
153
154 // Verification
155 void verify_on(outputStream* st);
156 void oop_verify_on(oop obj, outputStream* st);
157 };
158
159 #endif