typeArrayOop.hpp revision 6402:2377269bd73d 
1/*
2 * Copyright (c) 1997, 2012, 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_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
36class 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  friend class TypeArrayKlass;
48
49 public:
50  jbyte* byte_at_addr(int which) const {
51    assert(is_within_bounds(which), "index out of bounds");
52    return &byte_base()[which];
53  }
54
55  jboolean* bool_at_addr(int which) const {
56    assert(is_within_bounds(which), "index out of bounds");
57    return &bool_base()[which];
58  }
59
60  jchar* char_at_addr(int which) const {
61    assert(is_within_bounds(which), "index out of bounds");
62    return &char_base()[which];
63  }
64
65  jint* int_at_addr(int which) const {
66    assert(is_within_bounds(which), "index out of bounds");
67    return &int_base()[which];
68  }
69
70  jshort* short_at_addr(int which) const {
71    assert(is_within_bounds(which), "index out of bounds");
72    return &short_base()[which];
73  }
74
75  jushort* ushort_at_addr(int which) const {  // for field descriptor arrays
76    assert(is_within_bounds(which), "index out of bounds");
77    return (jushort*) &short_base()[which];
78  }
79
80  jlong* long_at_addr(int which) const {
81    assert(is_within_bounds(which), "index out of bounds");
82    return &long_base()[which];
83  }
84
85  jfloat* float_at_addr(int which) const {
86    assert(is_within_bounds(which), "index out of bounds");
87    return &float_base()[which];
88  }
89
90  jdouble* double_at_addr(int which) const {
91    assert(is_within_bounds(which), "index out of bounds");
92    return &double_base()[which];
93  }
94
95  jbyte byte_at(int which) const                  { return *byte_at_addr(which); }
96  void byte_at_put(int which, jbyte contents)     { *byte_at_addr(which) = contents; }
97
98  jboolean bool_at(int which) const               { return *bool_at_addr(which); }
99  void bool_at_put(int which, jboolean contents)  { *bool_at_addr(which) = contents; }
100
101  jchar char_at(int which) const                  { return *char_at_addr(which); }
102  void char_at_put(int which, jchar contents)     { *char_at_addr(which) = contents; }
103
104  jint int_at(int which) const                    { return *int_at_addr(which); }
105  void int_at_put(int which, jint contents)       { *int_at_addr(which) = contents; }
106
107  jshort short_at(int which) const                { return *short_at_addr(which); }
108  void short_at_put(int which, jshort contents)   { *short_at_addr(which) = contents; }
109
110  jushort ushort_at(int which) const              { return *ushort_at_addr(which); }
111  void ushort_at_put(int which, jushort contents) { *ushort_at_addr(which) = contents; }
112
113  jlong long_at(int which) const                  { return *long_at_addr(which); }
114  void long_at_put(int which, jlong contents)     { *long_at_addr(which) = contents; }
115
116  jfloat float_at(int which) const                { return *float_at_addr(which); }
117  void float_at_put(int which, jfloat contents)   { *float_at_addr(which) = contents; }
118
119  jdouble double_at(int which) const              { return *double_at_addr(which); }
120  void double_at_put(int which, jdouble contents) { *double_at_addr(which) = contents; }
121
122  jbyte byte_at_acquire(int which) const              { return OrderAccess::load_acquire(byte_at_addr(which)); }
123  void release_byte_at_put(int which, jbyte contents) { OrderAccess::release_store(byte_at_addr(which), contents); }
124
125  // Java thinks metadata arrays are just arrays of either long or int, since
126  // there doesn't seem to be T_ADDRESS, so this is a bit of unfortunate
127  // casting
128#ifdef _LP64
129  Metadata* metadata_at(int which) const {
130    return (Metadata*)*long_at_addr(which); }
131  void metadata_at_put(int which, Metadata* contents) {
132    *long_at_addr(which) = (long)contents;
133  }
134#else
135  Metadata* metadata_at(int which) const {
136    return (Metadata*)*int_at_addr(which); }
137  void metadata_at_put(int which, Metadata* contents) {
138    *int_at_addr(which) = (int)contents;
139  }
140#endif // _LP64
141
142  // Sizing
143
144  // Returns the number of words necessary to hold an array of "len"
145  // elements each of the given "byte_size".
146 private:
147  static int object_size(int lh, int length) {
148    int instance_header_size = Klass::layout_helper_header_size(lh);
149    int element_shift = Klass::layout_helper_log2_element_size(lh);
150    DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh));
151    assert(length <= arrayOopDesc::max_array_length(etype), "no overflow");
152
153    julong size_in_bytes = length;
154    size_in_bytes <<= element_shift;
155    size_in_bytes += instance_header_size;
156    julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize);
157    assert(size_in_words <= (julong)max_jint, "no overflow");
158
159    return align_object_size((intptr_t)size_in_words);
160  }
161
162 public:
163  int object_size() {
164    TypeArrayKlass* tk = TypeArrayKlass::cast(klass());
165    return object_size(tk->layout_helper(), length());
166  }
167};
168
169#endif // SHARE_VM_OOPS_TYPEARRAYOOP_HPP
170