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1010
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1 /*
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2 * Copyright 1997-2002 Sun Microsystems, Inc. All Rights Reserved.
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3 * Copyright 2007, 2008, 2009 Red Hat, Inc.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
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22 * have any questions.
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23 *
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24 */
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25
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26 typedef union unaligned {
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27 u4 u;
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28 u2 us;
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29 u8 ul;
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30 } __attribute__((packed)) unaligned;
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31
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32 class Bytes: AllStatic {
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33 public:
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34 // Returns true if the byte ordering used by Java is different
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35 // from the native byte ordering of the underlying machine.
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36 static inline bool is_Java_byte_ordering_different() {
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37 #ifdef VM_LITTLE_ENDIAN
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38 return true;
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39 #else
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40 return false;
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41 #endif
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42 }
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43
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44 // Efficient reading and writing of unaligned unsigned data in
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45 // platform-specific byte ordering.
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46 static inline u2 get_native_u2(address p){
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47 unaligned *up = (unaligned *) p;
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48 return up->us;
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49 }
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50
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51 static inline u4 get_native_u4(address p) {
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52 unaligned *up = (unaligned *) p;
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53 return up->u;
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54 }
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55
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56 static inline u8 get_native_u8(address p) {
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57 unaligned *up = (unaligned *) p;
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58 return up->ul;
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59 }
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60
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61 static inline void put_native_u2(address p, u2 x) {
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62 unaligned *up = (unaligned *) p;
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63 up->us = x;
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64 }
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65
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66 static inline void put_native_u4(address p, u4 x) {
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67 unaligned *up = (unaligned *) p;
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68 up->u = x;
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69 }
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70
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71 static inline void put_native_u8(address p, u8 x) {
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72 unaligned *up = (unaligned *) p;
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73 up->ul = x;
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74 }
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75
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76 // Efficient reading and writing of unaligned unsigned data in Java
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77 // byte ordering (i.e. big-endian ordering).
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78 #ifdef VM_LITTLE_ENDIAN
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79 // Byte-order reversal is needed
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80 static inline u2 get_Java_u2(address p) {
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81 return (u2(p[0]) << 8) |
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82 (u2(p[1]) );
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83 }
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84 static inline u4 get_Java_u4(address p) {
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85 return (u4(p[0]) << 24) |
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86 (u4(p[1]) << 16) |
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87 (u4(p[2]) << 8) |
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88 (u4(p[3]) );
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89 }
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90 static inline u8 get_Java_u8(address p) {
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91 u4 hi, lo;
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92 hi = (u4(p[0]) << 24) |
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93 (u4(p[1]) << 16) |
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94 (u4(p[2]) << 8) |
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95 (u4(p[3]) );
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96 lo = (u4(p[4]) << 24) |
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97 (u4(p[5]) << 16) |
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98 (u4(p[6]) << 8) |
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99 (u4(p[7]) );
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100 return u8(lo) | (u8(hi) << 32);
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101 }
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102
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103 static inline void put_Java_u2(address p, u2 x) {
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104 p[0] = x >> 8;
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105 p[1] = x;
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106 }
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107 static inline void put_Java_u4(address p, u4 x) {
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108 p[0] = x >> 24;
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109 p[1] = x >> 16;
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110 p[2] = x >> 8;
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111 p[3] = x;
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112 }
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113 static inline void put_Java_u8(address p, u8 x) {
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114 u4 hi, lo;
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115 lo = x;
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116 hi = x >> 32;
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117 p[0] = hi >> 24;
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118 p[1] = hi >> 16;
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119 p[2] = hi >> 8;
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120 p[3] = hi;
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121 p[4] = lo >> 24;
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122 p[5] = lo >> 16;
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123 p[6] = lo >> 8;
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124 p[7] = lo;
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125 }
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126
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127 // Efficient swapping of byte ordering
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128 static inline u2 swap_u2(u2 x);
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129 static inline u4 swap_u4(u4 x);
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130 static inline u8 swap_u8(u8 x);
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131 #else
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132 // No byte-order reversal is needed
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133 static inline u2 get_Java_u2(address p) {
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134 return get_native_u2(p);
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135 }
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136 static inline u4 get_Java_u4(address p) {
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137 return get_native_u4(p);
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138 }
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139 static inline u8 get_Java_u8(address p) {
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140 return get_native_u8(p);
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141 }
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142
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143 static inline void put_Java_u2(address p, u2 x) {
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144 put_native_u2(p, x);
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145 }
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146 static inline void put_Java_u4(address p, u4 x) {
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147 put_native_u4(p, x);
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148 }
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149 static inline void put_Java_u8(address p, u8 x) {
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150 put_native_u8(p, x);
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151 }
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152
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153 // No byte-order reversal is needed
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154 static inline u2 swap_u2(u2 x) { return x; }
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155 static inline u4 swap_u4(u4 x) { return x; }
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156 static inline u8 swap_u8(u8 x) { return x; }
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157 #endif // VM_LITTLE_ENDIAN
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158 };
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159
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160 #ifdef VM_LITTLE_ENDIAN
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161 // The following header contains the implementations of swap_u2,
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162 // swap_u4, and swap_u8
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163 #include "incls/_bytes_pd.inline.hpp.incl"
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164 #endif // VM_LITTLE_ENDIAN
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