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1 /*
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2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // A typeArrayOop is an array containing basic types (non oop elements).
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26 // It is used for arrays of {characters, singles, doubles, bytes, shorts, integers, longs}
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27 #include <limits.h>
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28
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29 class typeArrayOopDesc : public arrayOopDesc {
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30 protected:
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31 jchar* char_base() const { return (jchar*) base(T_CHAR); }
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32 jboolean* bool_base() const { return (jboolean*)base(T_BOOLEAN); }
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33 jbyte* byte_base() const { return (jbyte*) base(T_BYTE); }
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34 jint* int_base() const { return (jint*) base(T_INT); }
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35 jlong* long_base() const { return (jlong*) base(T_LONG); }
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36 jshort* short_base() const { return (jshort*) base(T_SHORT); }
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37 jfloat* float_base() const { return (jfloat*) base(T_FLOAT); }
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38 jdouble* double_base() const { return (jdouble*) base(T_DOUBLE); }
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39
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40 friend class typeArrayKlass;
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41
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42 public:
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43 jbyte* byte_at_addr(int which) const {
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44 assert(is_within_bounds(which), "index out of bounds");
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45 return &byte_base()[which];
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46 }
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47
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48 jboolean* bool_at_addr(int which) const {
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49 assert(is_within_bounds(which), "index out of bounds");
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50 return &bool_base()[which];
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51 }
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52
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53 jchar* char_at_addr(int which) const {
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54 assert(is_within_bounds(which), "index out of bounds");
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55 return &char_base()[which];
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56 }
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57
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58 jint* int_at_addr(int which) const {
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59 assert(is_within_bounds(which), "index out of bounds");
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60 return &int_base()[which];
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61 }
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62
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63 jshort* short_at_addr(int which) const {
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64 assert(is_within_bounds(which), "index out of bounds");
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65 return &short_base()[which];
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66 }
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67
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68 jushort* ushort_at_addr(int which) const { // for field descriptor arrays
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69 assert(is_within_bounds(which), "index out of bounds");
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70 return (jushort*) &short_base()[which];
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71 }
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72
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73 jlong* long_at_addr(int which) const {
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74 assert(is_within_bounds(which), "index out of bounds");
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75 return &long_base()[which];
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76 }
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77
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78 jfloat* float_at_addr(int which) const {
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79 assert(is_within_bounds(which), "index out of bounds");
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80 return &float_base()[which];
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81 }
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82
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83 jdouble* double_at_addr(int which) const {
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84 assert(is_within_bounds(which), "index out of bounds");
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85 return &double_base()[which];
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86 }
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87
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88 jbyte byte_at(int which) const { return *byte_at_addr(which); }
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89 void byte_at_put(int which, jbyte contents) { *byte_at_addr(which) = contents; }
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90
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91 jboolean bool_at(int which) const { return *bool_at_addr(which); }
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92 void bool_at_put(int which, jboolean contents) { *bool_at_addr(which) = contents; }
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93
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94 jchar char_at(int which) const { return *char_at_addr(which); }
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95 void char_at_put(int which, jchar contents) { *char_at_addr(which) = contents; }
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96
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97 jint int_at(int which) const { return *int_at_addr(which); }
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98 void int_at_put(int which, jint contents) { *int_at_addr(which) = contents; }
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99
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100 jshort short_at(int which) const { return *short_at_addr(which); }
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101 void short_at_put(int which, jshort contents) { *short_at_addr(which) = contents; }
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102
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103 jushort ushort_at(int which) const { return *ushort_at_addr(which); }
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104 void ushort_at_put(int which, jushort contents) { *ushort_at_addr(which) = contents; }
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105
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106 jlong long_at(int which) const { return *long_at_addr(which); }
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107 void long_at_put(int which, jlong contents) { *long_at_addr(which) = contents; }
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108
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109 jfloat float_at(int which) const { return *float_at_addr(which); }
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110 void float_at_put(int which, jfloat contents) { *float_at_addr(which) = contents; }
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111
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112 jdouble double_at(int which) const { return *double_at_addr(which); }
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113 void double_at_put(int which, jdouble contents) { *double_at_addr(which) = contents; }
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114
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115 jbyte byte_at_acquire(int which) const { return OrderAccess::load_acquire(byte_at_addr(which)); }
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116 void release_byte_at_put(int which, jbyte contents) { OrderAccess::release_store(byte_at_addr(which), contents); }
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117
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118 // Sizing
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119
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120 // Returns the number of words necessary to hold an array of "len"
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121 // elements each of the given "byte_size".
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122 private:
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123 static int object_size(int lh, int length) {
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124 int instance_header_size = Klass::layout_helper_header_size(lh);
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125 int element_shift = Klass::layout_helper_log2_element_size(lh);
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126 DEBUG_ONLY(BasicType etype = Klass::layout_helper_element_type(lh));
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127 assert(length <= arrayOopDesc::max_array_length(etype), "no overflow");
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128
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129 julong size_in_bytes = length;
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130 size_in_bytes <<= element_shift;
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131 size_in_bytes += instance_header_size;
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132 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize);
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133 assert(size_in_words <= (julong)max_jint, "no overflow");
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134
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135 return align_object_size((intptr_t)size_in_words);
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136 }
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137
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138 public:
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139 int object_size() {
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140 typeArrayKlass* tk = typeArrayKlass::cast(klass());
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141 return object_size(tk->layout_helper(), length());
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142 }
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143 };
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