typeArrayOop.hpp revision 1472:c18cbe5936b8 
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.
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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
29class 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};
144