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annotate src/share/vm/oops/typeArrayOop.hpp @ 1689:f4f596978298
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author | never |
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date | Mon, 09 Aug 2010 17:51:56 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 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 }; |