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1 /*
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2 * Copyright 1997-2002 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 class Bytes: AllStatic {
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26 public:
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27 // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering
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28 // Sparc needs to check for alignment.
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29
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30 // can I count on address always being a pointer to an unsigned char? Yes
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31
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32 // Returns true, if the byte ordering used by Java is different from the nativ byte ordering
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33 // of the underlying machine. For example, true for Intel x86, False, for Solaris on Sparc.
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34 static inline bool is_Java_byte_ordering_different() { return false; }
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35
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36 // Thus, a swap between native and Java ordering is always a no-op:
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37 static inline u2 swap_u2(u2 x) { return x; }
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38 static inline u4 swap_u4(u4 x) { return x; }
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39 static inline u8 swap_u8(u8 x) { return x; }
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40
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41 static inline u2 get_native_u2(address p){
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42 return (intptr_t(p) & 1) == 0
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43 ? *(u2*)p
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44 : ( u2(p[0]) << 8 )
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45 | ( u2(p[1]) );
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46 }
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47
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48 static inline u4 get_native_u4(address p) {
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49 switch (intptr_t(p) & 3) {
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50 case 0: return *(u4*)p;
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51
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52 case 2: return ( u4( ((u2*)p)[0] ) << 16 )
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53 | ( u4( ((u2*)p)[1] ) );
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54
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55 default: return ( u4(p[0]) << 24 )
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56 | ( u4(p[1]) << 16 )
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57 | ( u4(p[2]) << 8 )
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58 | u4(p[3]);
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59 }
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60 }
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61
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62 static inline u8 get_native_u8(address p) {
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63 switch (intptr_t(p) & 7) {
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64 case 0: return *(u8*)p;
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65
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66 case 4: return ( u8( ((u4*)p)[0] ) << 32 )
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67 | ( u8( ((u4*)p)[1] ) );
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68
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69 case 2: return ( u8( ((u2*)p)[0] ) << 48 )
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70 | ( u8( ((u2*)p)[1] ) << 32 )
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71 | ( u8( ((u2*)p)[2] ) << 16 )
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72 | ( u8( ((u2*)p)[3] ) );
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73
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74 default: return ( u8(p[0]) << 56 )
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75 | ( u8(p[1]) << 48 )
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76 | ( u8(p[2]) << 40 )
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77 | ( u8(p[3]) << 32 )
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78 | ( u8(p[4]) << 24 )
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79 | ( u8(p[5]) << 16 )
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80 | ( u8(p[6]) << 8 )
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81 | u8(p[7]);
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82 }
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83 }
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84
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85
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86
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87 static inline void put_native_u2(address p, u2 x) {
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88 if ( (intptr_t(p) & 1) == 0 ) *(u2*)p = x;
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89 else {
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90 p[0] = x >> 8;
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91 p[1] = x;
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92 }
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93 }
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94
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95 static inline void put_native_u4(address p, u4 x) {
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96 switch ( intptr_t(p) & 3 ) {
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97 case 0: *(u4*)p = x;
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98 break;
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99
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100 case 2: ((u2*)p)[0] = x >> 16;
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101 ((u2*)p)[1] = x;
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102 break;
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103
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104 default: ((u1*)p)[0] = x >> 24;
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105 ((u1*)p)[1] = x >> 16;
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106 ((u1*)p)[2] = x >> 8;
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107 ((u1*)p)[3] = x;
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108 break;
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109 }
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110 }
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111
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112 static inline void put_native_u8(address p, u8 x) {
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113 switch ( intptr_t(p) & 7 ) {
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114 case 0: *(u8*)p = x;
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115 break;
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116
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117 case 4: ((u4*)p)[0] = x >> 32;
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118 ((u4*)p)[1] = x;
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119 break;
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120
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121 case 2: ((u2*)p)[0] = x >> 48;
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122 ((u2*)p)[1] = x >> 32;
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123 ((u2*)p)[2] = x >> 16;
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124 ((u2*)p)[3] = x;
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125 break;
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126
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127 default: ((u1*)p)[0] = x >> 56;
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128 ((u1*)p)[1] = x >> 48;
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129 ((u1*)p)[2] = x >> 40;
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130 ((u1*)p)[3] = x >> 32;
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131 ((u1*)p)[4] = x >> 24;
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132 ((u1*)p)[5] = x >> 16;
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133 ((u1*)p)[6] = x >> 8;
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134 ((u1*)p)[7] = x;
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135 }
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136 }
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137
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138
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139 // Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering)
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140 // (no byte-order reversal is needed since SPARC CPUs are big-endian oriented)
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141 static inline u2 get_Java_u2(address p) { return get_native_u2(p); }
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142 static inline u4 get_Java_u4(address p) { return get_native_u4(p); }
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143 static inline u8 get_Java_u8(address p) { return get_native_u8(p); }
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144
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145 static inline void put_Java_u2(address p, u2 x) { put_native_u2(p, x); }
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146 static inline void put_Java_u4(address p, u4 x) { put_native_u4(p, x); }
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147 static inline void put_Java_u8(address p, u8 x) { put_native_u8(p, x); }
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148 };
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149
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150 //Reconciliation History
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151 // 1.7 98/02/24 10:18:41 bytes_i486.hpp
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152 // 1.10 98/04/08 18:47:57 bytes_i486.hpp
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153 // 1.13 98/07/15 17:10:03 bytes_i486.hpp
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154 // 1.14 98/08/13 10:38:23 bytes_i486.hpp
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155 // 1.15 98/10/05 16:30:21 bytes_i486.hpp
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156 // 1.17 99/06/22 16:37:35 bytes_i486.hpp
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157 //End
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