1 /*
2 * Copyright (c) 2017, 2020, 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);
45
46 public:
47
48 FlatArrayKlass() {}
49
50 // Returns the ObjArrayKlass for n'th dimension.
51 virtual ArrayKlass* array_klass(int n, TRAPS);
52 virtual ArrayKlass* array_klass_or_null(int n);
53
54 // Returns the array class with this class as element type.
55 virtual ArrayKlass* array_klass(TRAPS);
56 virtual ArrayKlass* array_klass_or_null();
57
58 virtual InlineKlass* element_klass() const;
59 virtual void set_element_klass(Klass* k);
60
61 // Casting from Klass*
62 static FlatArrayKlass* cast(Klass* k) {
63 assert(k->is_flatArray_klass(), "cast to FlatArrayKlass");
64 return (FlatArrayKlass*) k;
65 }
66
67 // klass allocation
68 static FlatArrayKlass* allocate_klass(Klass* element_klass, TRAPS);
69
70 void initialize(TRAPS);
71
72 ModuleEntry* module() const;
73 PackageEntry* package() const;
74
75 bool can_be_primary_super_slow() const;
76 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
77 Array<InstanceKlass*>* transitive_interfaces);
78
79 int element_byte_size() const { return 1 << layout_helper_log2_element_size(_layout_helper); }
80
81 bool is_flatArray_klass_slow() const { return true; }
82
83 bool contains_oops() {
84 return element_klass()->contains_oops();
85 }
86
87 // Override.
88 bool element_access_is_atomic() {
89 return element_klass()->is_atomic();
90 }
91
92 oop protection_domain() const;
93
94 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
95
96 static jint array_layout_helper(InlineKlass* vklass); // layout helper for values
97
98 // sizing
99 static int header_size() { return sizeof(FlatArrayKlass)/HeapWordSize; }
100 int size() const { return ArrayKlass::static_size(header_size()); }
101
102 jint max_elements() const;
103
104 size_t oop_size(oop obj) const;
105
106 // Oop Allocation
107 flatArrayOop allocate(int length, TRAPS);
108 oop multi_allocate(int rank, jint* sizes, TRAPS);
109
110 // Naming
111 const char* internal_name() const { return external_name(); }
112
113 // Copying
114 void copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS);
115
116 // GC specific object visitors
117 //
118 // Mark Sweep
119 int oop_ms_adjust_pointers(oop obj);
120
121
122 template <typename T, typename OopClosureType>
123 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
124
125 template <typename T, typename OopClosureType>
126 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
127
128 template <typename T, typename OopClosureType>
129 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
130
131 template <typename T, class OopClosureType>
132 inline void oop_oop_iterate_elements(flatArrayOop a, OopClosureType* closure);
133
134 private:
135 template <typename T, class OopClosureType>
136 inline void oop_oop_iterate_elements_specialized(flatArrayOop a, OopClosureType* closure);
137
138 template <typename T, class OopClosureType>
139 inline void oop_oop_iterate_elements_bounded(flatArrayOop a, OopClosureType* closure, MemRegion mr);
140
141 template <typename T, class OopClosureType>
142 inline void oop_oop_iterate_elements_specialized_bounded(flatArrayOop a, OopClosureType* closure, void* low, void* high);
143
144 public:
145 jint compute_modifier_flags() const;
146
147 // Printing
148 void print_on(outputStream* st) const;
149 void print_value_on(outputStream* st) const;
150
151 void oop_print_value_on(oop obj, outputStream* st);
152 #ifndef PRODUCT
153 void oop_print_on(oop obj, outputStream* st);
154 #endif
155
156 // Verification
157 void verify_on(outputStream* st);
158 void oop_verify_on(oop obj, outputStream* st);
159 };
160
161 #endif