1 /*
2 * Copyright (c) 1997, 2018, 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_TYPEARRAYOOP_HPP
26 #define SHARE_VM_OOPS_TYPEARRAYOOP_HPP
27
28 #include "oops/arrayOop.hpp"
29 #include "oops/typeArrayKlass.hpp"
30 #include "runtime/orderAccess.inline.hpp"
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 class typeArrayOopDesc : public arrayOopDesc {
37 private:
38 template <class T>
39 static ptrdiff_t element_offset(BasicType bt, int index) {
40 return arrayOopDesc::base_offset_in_bytes(bt) + sizeof(T) * index;
41 }
42
43 protected:
44 jchar* char_base() const;
45 jboolean* bool_base() const;
46 jbyte* byte_base() const;
47 jint* int_base() const;
48 jlong* long_base() const;
49 jshort* short_base() const;
50 jfloat* float_base() const;
51 jdouble* double_base() const;
52
53 friend class TypeArrayKlass;
54
55 public:
56 jbyte* byte_at_addr(int which) const;
57 jboolean* bool_at_addr(int which) const;
58 jchar* char_at_addr(int which) const;
59 jint* int_at_addr(int which) const;
60 jshort* short_at_addr(int which) const;
61 jushort* ushort_at_addr(int which) const;
62 jlong* long_at_addr(int which) const;
63 jfloat* float_at_addr(int which) const;
64 jdouble* double_at_addr(int which) const;
65
66 jbyte byte_at(int which) const;
67 void byte_at_put(int which, jbyte contents);
68
69 jboolean bool_at(int which) const;
70 void bool_at_put(int which, jboolean contents);
71
72 jchar char_at(int which) const;
73 void char_at_put(int which, jchar contents);
74
75 jint int_at(int which) const;
76 void int_at_put(int which, jint contents);
77
78 jshort short_at(int which) const;
79 void short_at_put(int which, jshort contents);
80
81 jushort ushort_at(int which) const;
82 void ushort_at_put(int which, jushort contents);
83
84 jlong long_at(int which) const;
85 void long_at_put(int which, jlong contents);
86
87 jfloat float_at(int which) const;
88 void float_at_put(int which, jfloat contents);
89
90 jdouble double_at(int which) const;
91 void double_at_put(int which, jdouble contents);
92
93 jbyte byte_at_acquire(int which) const;
94 void release_byte_at_put(int which, jbyte contents);
95
96 Symbol* symbol_at(int which) const;
97 void symbol_at_put(int which, Symbol* contents);
98
99 // Sizing
100
101 // Returns the number of words necessary to hold an array of "len"
102 // elements each of the given "byte_size".
103 private:
104 static int object_size(int lh, int length) {
105 int instance_header_size = Klass::layout_helper_header_size(lh);
106 int element_shift = Klass::layout_helper_log2_element_size(lh);
107 DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh));
108 assert(length <= arrayOopDesc::max_array_length(etype), "no overflow");
109
110 julong size_in_bytes = (juint)length;
111 size_in_bytes <<= element_shift;
112 size_in_bytes += instance_header_size;
113 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize);
114 assert(size_in_words <= (julong)max_jint, "no overflow");
115
116 return align_object_size((intptr_t)size_in_words);
117 }
118
119 public:
120 inline int object_size();
121 };
122
123 #endif // SHARE_VM_OOPS_TYPEARRAYOOP_HPP