1 /*
2 * Copyright (c) 1997, 2017, 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 protected:
38 jchar* char_base() const { return (jchar*) base(T_CHAR); }
39 jboolean* bool_base() const { return (jboolean*)base(T_BOOLEAN); }
40 jbyte* byte_base() const { return (jbyte*) base(T_BYTE); }
41 jint* int_base() const { return (jint*) base(T_INT); }
42 jlong* long_base() const { return (jlong*) base(T_LONG); }
43 jshort* short_base() const { return (jshort*) base(T_SHORT); }
44 jfloat* float_base() const { return (jfloat*) base(T_FLOAT); }
45 jdouble* double_base() const { return (jdouble*) base(T_DOUBLE); }
46
47 static int char_at_offset(int index) { return base_offset_in_bytes(T_CHAR) + sizeof(jchar) * index; }
48 static int bool_at_offset(int index) { return base_offset_in_bytes(T_BOOLEAN) + sizeof(jboolean) * index; }
49 static int byte_at_offset(int index) { return base_offset_in_bytes(T_BYTE) + sizeof(jbyte) * index; }
50 static int int_at_offset(int index) { return base_offset_in_bytes(T_INT) + sizeof(jint) * index; }
51 static int long_at_offset(int index) { return base_offset_in_bytes(T_LONG) + sizeof(jlong) * index; }
52 static int short_at_offset(int index) { return base_offset_in_bytes(T_SHORT) + sizeof(jshort) * index; }
53 static int float_at_offset(int index) { return base_offset_in_bytes(T_FLOAT) + sizeof(jfloat) * index; }
54 static int double_at_offset(int index) { return base_offset_in_bytes(T_DOUBLE) + sizeof(jdouble) * index; }
55
56 friend class TypeArrayKlass;
57
58 public:
59 jbyte* byte_at_addr(int which) const {
60 assert(is_within_bounds(which), "index %d out of bounds %d", which, length());
61 return &byte_base()[which];
62 }
63
64 jboolean* bool_at_addr(int which) const {
65 assert(is_within_bounds(which), "index %d out of bounds %d", which, length());
66 return &bool_base()[which];
67 }
68
69 jchar* char_at_addr(int which) const {
70 assert(is_within_bounds(which), "index %d out of bounds %d", which, length());
71 return &char_base()[which];
72 }
73
74 jint* int_at_addr(int which) const {
75 assert(is_within_bounds(which), "index %d out of bounds %d", which, length());
76 return &int_base()[which];
77 }
78
79 jshort* short_at_addr(int which) const {
80 assert(is_within_bounds(which), "index %d out of bounds %d", which, length());
81 return &short_base()[which];
82 }
83
84 jushort* ushort_at_addr(int which) const { // for field descriptor arrays
85 assert(is_within_bounds(which), "index %d out of bounds %d", which, length());
86 return (jushort*) &short_base()[which];
87 }
88
89 jlong* long_at_addr(int which) const {
90 assert(is_within_bounds(which), "index %d out of bounds %d", which, length());
91 return &long_base()[which];
92 }
93
94 jfloat* float_at_addr(int which) const {
95 assert(is_within_bounds(which), "index %d out of bounds %d", which, length());
96 return &float_base()[which];
97 }
98
99 jdouble* double_at_addr(int which) const {
100 assert(is_within_bounds(which), "index %d out of bounds %d", which, length());
101 return &double_base()[which];
102 }
103
104 jbyte byte_at(int which) const;
105 void byte_at_put(int which, jbyte contents);
106
107 jboolean bool_at(int which) const;
108 void bool_at_put(int which, jboolean contents);
109
110 jchar char_at(int which) const;
111 void char_at_put(int which, jchar contents);
112
113 jint int_at(int which) const;
114 void int_at_put(int which, jint contents);
115
116 jshort short_at(int which) const;
117 void short_at_put(int which, jshort contents);
118
119 jushort ushort_at(int which) const;
120 void ushort_at_put(int which, jushort contents);
121
122 jlong long_at(int which) const;
123 void long_at_put(int which, jlong contents);
124
125 jfloat float_at(int which) const;
126 void float_at_put(int which, jfloat contents);
127
128 jdouble double_at(int which) const;
129 void double_at_put(int which, jdouble contents);
130
131 jbyte byte_at_acquire(int which) const;
132 void release_byte_at_put(int which, jbyte contents);
133
134 // Java thinks Symbol arrays are just arrays of either long or int, since
135 // there doesn't seem to be T_ADDRESS, so this is a bit of unfortunate
136 // casting
137 #ifdef _LP64
138 Symbol* symbol_at(int which) const {
139 return (Symbol*)*long_at_addr(which); }
140 void symbol_at_put(int which, Symbol* contents) {
141 *long_at_addr(which) = (jlong)contents;
142 }
143 #else
144 Symbol* symbol_at(int which) const {
145 return (Symbol*)*int_at_addr(which); }
146 void symbol_at_put(int which, Symbol* contents) {
147 *int_at_addr(which) = (int)contents;
148 }
149 #endif // _LP64
150
151 // Sizing
152
153 // Returns the number of words necessary to hold an array of "len"
154 // elements each of the given "byte_size".
155 private:
156 static int object_size(int lh, int length) {
157 int instance_header_size = Klass::layout_helper_header_size(lh);
158 int element_shift = Klass::layout_helper_log2_element_size(lh);
159 DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh));
160 assert(length <= arrayOopDesc::max_array_length(etype), "no overflow");
161
162 julong size_in_bytes = (juint)length;
163 size_in_bytes <<= element_shift;
164 size_in_bytes += instance_header_size;
165 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize);
166 assert(size_in_words <= (julong)max_jint, "no overflow");
167
168 return align_object_size((intptr_t)size_in_words);
169 }
170
171 public:
172 inline int object_size();
173 };
174
175 #endif // SHARE_VM_OOPS_TYPEARRAYOOP_HPP