1 /*
2 * Copyright (c) 1997, 2021, 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_OOPS_TYPEARRAYOOP_HPP
26 #define SHARE_OOPS_TYPEARRAYOOP_HPP
27
28 #include "oops/arrayOop.hpp"
29 #include "oops/typeArrayKlass.hpp"
30 #include <type_traits>
31
32 // A typeArrayOop is an array containing basic types (non oop elements).
33 // It is used for arrays of {characters, singles, doubles, bytes, shorts, integers, longs}
34 #include <limits.h>
35
36 namespace TypeToBT {
37 template<typename T> BasicType to_basic_type();
38 template<> inline BasicType to_basic_type<jboolean>() { return T_BOOLEAN; }
39 template<> inline BasicType to_basic_type<jbyte>() { return T_BYTE; }
40 template<> inline BasicType to_basic_type<jchar>() { return T_CHAR; }
41 template<> inline BasicType to_basic_type<jshort>() { return T_SHORT; }
42 template<> inline BasicType to_basic_type<jint>() { return T_INT; }
43 template<> inline BasicType to_basic_type<jlong>() { return T_LONG; }
44 template<> inline BasicType to_basic_type<jfloat>() { return T_FLOAT; }
45 template<> inline BasicType to_basic_type<jdouble>() { return T_DOUBLE; }
46 };
47
48 class typeArrayOopDesc : public arrayOopDesc {
49 private:
50 template <typename T>
51 static BasicType bt() { return TypeToBT::to_basic_type<T>(); }
52
53 protected:
54 jchar* char_base() const;
55 jboolean* bool_base() const;
56 jbyte* byte_base() const;
57 jint* int_base() const;
58 jlong* long_base() const;
59 jshort* short_base() const;
60 jfloat* float_base() const;
61 jdouble* double_base() const;
62
63 friend class TypeArrayKlass;
64
65 public:
66 template <typename T>
67 static ptrdiff_t element_offset(int index) {
68 return arrayOopDesc::base_offset_in_bytes(bt<T>()) + sizeof(T) * index;
69 }
70
71 jbyte* byte_at_addr(int which) const;
72 jboolean* bool_at_addr(int which) const;
73 jchar* char_at_addr(int which) const;
74 jint* int_at_addr(int which) const;
75 jshort* short_at_addr(int which) const;
76 jushort* ushort_at_addr(int which) const;
77 jlong* long_at_addr(int which) const;
78 jfloat* float_at_addr(int which) const;
79 jdouble* double_at_addr(int which) const;
80
81 jbyte byte_at(int which) const;
82 void byte_at_put(int which, jbyte contents);
83
84 jboolean bool_at(int which) const;
85 void bool_at_put(int which, jboolean contents);
86
87 jchar char_at(int which) const;
88 void char_at_put(int which, jchar contents);
89
90 jint int_at(int which) const;
91 void int_at_put(int which, jint contents);
92
93 jshort short_at(int which) const;
94 void short_at_put(int which, jshort contents);
95
96 jushort ushort_at(int which) const;
97 void ushort_at_put(int which, jushort contents);
98
99 jlong long_at(int which) const;
100 void long_at_put(int which, jlong contents);
101
102 jfloat float_at(int which) const;
103 void float_at_put(int which, jfloat contents);
104
105 jdouble double_at(int which) const;
106 void double_at_put(int which, jdouble contents);
107
108 jbyte byte_at_acquire(int which) const;
109 void release_byte_at_put(int which, jbyte contents);
110
111 Symbol* symbol_at(int which) const;
112 void symbol_at_put(int which, Symbol* contents);
113
114 // Sizing
115
116 // Returns the number of words necessary to hold an array of "len"
117 // elements each of the given "byte_size".
118 static size_t object_size(int lh, int length) {
119 int instance_header_size = Klass::layout_helper_header_size(lh);
120 int element_shift = Klass::layout_helper_log2_element_size(lh);
121 DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh));
122 assert(length <= arrayOopDesc::max_array_length(etype), "no overflow");
123
124 julong size_in_bytes = (juint)length;
125 size_in_bytes <<= element_shift;
126 size_in_bytes += instance_header_size;
127 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize);
128 assert(size_in_words <= (julong)max_jint, "no overflow");
129
130 return align_object_size((size_t)size_in_words);
131 }
132
133 public:
134 inline size_t object_size(const TypeArrayKlass* tk) const;
135 };
136
137 // See similar requirement for oopDesc.
138 static_assert(std::is_trivially_default_constructible<typeArrayOopDesc>::value, "required");
139
140 #endif // SHARE_OOPS_TYPEARRAYOOP_HPP