1 /*
2 * Copyright (c) 1997, 2007, 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 // A typeArrayOop is an array containing basic types (non oop elements).
26 // It is used for arrays of {characters, singles, doubles, bytes, shorts, integers, longs}
27 #include <limits.h>
28
29 class typeArrayOopDesc : public arrayOopDesc {
30 protected:
31 jchar* char_base() const { return (jchar*) base(T_CHAR); }
32 jboolean* bool_base() const { return (jboolean*)base(T_BOOLEAN); }
33 jbyte* byte_base() const { return (jbyte*) base(T_BYTE); }
34 jint* int_base() const { return (jint*) base(T_INT); }
35 jlong* long_base() const { return (jlong*) base(T_LONG); }
36 jshort* short_base() const { return (jshort*) base(T_SHORT); }
37 jfloat* float_base() const { return (jfloat*) base(T_FLOAT); }
38 jdouble* double_base() const { return (jdouble*) base(T_DOUBLE); }
39
40 friend class typeArrayKlass;
41
42 public:
43 jbyte* byte_at_addr(int which) const {
44 assert(is_within_bounds(which), "index out of bounds");
45 return &byte_base()[which];
46 }
47
48 jboolean* bool_at_addr(int which) const {
49 assert(is_within_bounds(which), "index out of bounds");
50 return &bool_base()[which];
51 }
52
53 jchar* char_at_addr(int which) const {
54 assert(is_within_bounds(which), "index out of bounds");
55 return &char_base()[which];
56 }
57
58 jint* int_at_addr(int which) const {
59 assert(is_within_bounds(which), "index out of bounds");
60 return &int_base()[which];
61 }
62
63 jshort* short_at_addr(int which) const {
64 assert(is_within_bounds(which), "index out of bounds");
65 return &short_base()[which];
66 }
67
68 jushort* ushort_at_addr(int which) const { // for field descriptor arrays
69 assert(is_within_bounds(which), "index out of bounds");
70 return (jushort*) &short_base()[which];
71 }
72
73 jlong* long_at_addr(int which) const {
74 assert(is_within_bounds(which), "index out of bounds");
75 return &long_base()[which];
76 }
77
78 jfloat* float_at_addr(int which) const {
79 assert(is_within_bounds(which), "index out of bounds");
80 return &float_base()[which];
81 }
82
83 jdouble* double_at_addr(int which) const {
84 assert(is_within_bounds(which), "index out of bounds");
85 return &double_base()[which];
86 }
87
88 jbyte byte_at(int which) const { return *byte_at_addr(which); }
89 void byte_at_put(int which, jbyte contents) { *byte_at_addr(which) = contents; }
90
91 jboolean bool_at(int which) const { return *bool_at_addr(which); }
92 void bool_at_put(int which, jboolean contents) { *bool_at_addr(which) = contents; }
93
94 jchar char_at(int which) const { return *char_at_addr(which); }
95 void char_at_put(int which, jchar contents) { *char_at_addr(which) = contents; }
96
97 jint int_at(int which) const { return *int_at_addr(which); }
98 void int_at_put(int which, jint contents) { *int_at_addr(which) = contents; }
99
100 jshort short_at(int which) const { return *short_at_addr(which); }
101 void short_at_put(int which, jshort contents) { *short_at_addr(which) = contents; }
102
103 jushort ushort_at(int which) const { return *ushort_at_addr(which); }
104 void ushort_at_put(int which, jushort contents) { *ushort_at_addr(which) = contents; }
105
106 jlong long_at(int which) const { return *long_at_addr(which); }
107 void long_at_put(int which, jlong contents) { *long_at_addr(which) = contents; }
108
109 jfloat float_at(int which) const { return *float_at_addr(which); }
110 void float_at_put(int which, jfloat contents) { *float_at_addr(which) = contents; }
111
112 jdouble double_at(int which) const { return *double_at_addr(which); }
113 void double_at_put(int which, jdouble contents) { *double_at_addr(which) = contents; }
114
115 jbyte byte_at_acquire(int which) const { return OrderAccess::load_acquire(byte_at_addr(which)); }
116 void release_byte_at_put(int which, jbyte contents) { OrderAccess::release_store(byte_at_addr(which), contents); }
117
118 // Sizing
119
120 // Returns the number of words necessary to hold an array of "len"
121 // elements each of the given "byte_size".
122 private:
123 static int object_size(int lh, int length) {
124 int instance_header_size = Klass::layout_helper_header_size(lh);
125 int element_shift = Klass::layout_helper_log2_element_size(lh);
126 DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh));
127 assert(length <= arrayOopDesc::max_array_length(etype), "no overflow");
128
129 julong size_in_bytes = length;
130 size_in_bytes <<= element_shift;
131 size_in_bytes += instance_header_size;
132 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize);
133 assert(size_in_words <= (julong)max_jint, "no overflow");
134
135 return align_object_size((intptr_t)size_in_words);
136 }
137
138 public:
139 int object_size() {
140 typeArrayKlass* tk = typeArrayKlass::cast(klass());
141 return object_size(tk->layout_helper(), length());
142 }
143 };