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1 //===- Endian.h - Utilities for IO with endian specific data ----*- C++ -*-===//
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2 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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3 // The LLVM Compiler Infrastructure
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file declares generic functions to read and write endian specific data.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_SUPPORT_ENDIAN_H
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15 #define LLVM_SUPPORT_ENDIAN_H
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16
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17 #include "llvm/Support/AlignOf.h"
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18 #include "llvm/Support/Host.h"
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19 #include "llvm/Support/SwapByteOrder.h"
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20
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21 namespace llvm {
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22 namespace support {
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23 enum endianness {big, little, native};
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24
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25 // These are named values for common alignments.
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26 enum {aligned = 0, unaligned = 1};
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27
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28 namespace detail {
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29 /// \brief ::value is either alignment, or alignof(T) if alignment is 0.
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30 template<class T, int alignment>
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31 struct PickAlignment {
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32 enum {value = alignment == 0 ? AlignOf<T>::Alignment : alignment};
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33 };
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34 } // end namespace detail
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35
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36 namespace endian {
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77
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37 /// Swap the bytes of value to match the given endianness.
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38 template<typename value_type, endianness endian>
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39 inline value_type byte_swap(value_type value) {
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40 if (endian != native && sys::IsBigEndianHost != (endian == big))
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77
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41 sys::swapByteOrder(value);
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42 return value;
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43 }
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44
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77
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45 /// Read a value of a particular endianness from memory.
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46 template<typename value_type,
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47 endianness endian,
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48 std::size_t alignment>
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49 inline value_type read(const void *memory) {
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50 value_type ret;
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51
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52 memcpy(&ret,
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53 LLVM_ASSUME_ALIGNED(memory,
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54 (detail::PickAlignment<value_type, alignment>::value)),
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55 sizeof(value_type));
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56 return byte_swap<value_type, endian>(ret);
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57 }
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58
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77
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59 /// Read a value of a particular endianness from a buffer, and increment the
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60 /// buffer past that value.
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95
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61 template<typename value_type, endianness endian, std::size_t alignment,
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62 typename CharT>
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63 inline value_type readNext(const CharT *&memory) {
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77
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64 value_type ret = read<value_type, endian, alignment>(memory);
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65 memory += sizeof(value_type);
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66 return ret;
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67 }
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68
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69 /// Write a value to memory with a particular endianness.
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70 template<typename value_type,
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71 endianness endian,
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72 std::size_t alignment>
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73 inline void write(void *memory, value_type value) {
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74 value = byte_swap<value_type, endian>(value);
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75 memcpy(LLVM_ASSUME_ALIGNED(memory,
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76 (detail::PickAlignment<value_type, alignment>::value)),
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77 &value,
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78 sizeof(value_type));
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79 }
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95
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80
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81 template <typename value_type>
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82 using make_unsigned_t = typename std::make_unsigned<value_type>::type;
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83
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84 /// Read a value of a particular endianness from memory, for a location
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85 /// that starts at the given bit offset within the first byte.
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86 template <typename value_type, endianness endian, std::size_t alignment>
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87 inline value_type readAtBitAlignment(const void *memory, uint64_t startBit) {
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88 assert(startBit < 8);
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89 if (startBit == 0)
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90 return read<value_type, endian, alignment>(memory);
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91 else {
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92 // Read two values and compose the result from them.
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93 value_type val[2];
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94 memcpy(&val[0],
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95 LLVM_ASSUME_ALIGNED(
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96 memory, (detail::PickAlignment<value_type, alignment>::value)),
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97 sizeof(value_type) * 2);
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98 val[0] = byte_swap<value_type, endian>(val[0]);
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99 val[1] = byte_swap<value_type, endian>(val[1]);
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100
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101 // Shift bits from the lower value into place.
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102 make_unsigned_t<value_type> lowerVal = val[0] >> startBit;
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103 // Mask off upper bits after right shift in case of signed type.
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104 make_unsigned_t<value_type> numBitsFirstVal =
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105 (sizeof(value_type) * 8) - startBit;
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106 lowerVal &= ((make_unsigned_t<value_type>)1 << numBitsFirstVal) - 1;
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107
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108 // Get the bits from the upper value.
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109 make_unsigned_t<value_type> upperVal =
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110 val[1] & (((make_unsigned_t<value_type>)1 << startBit) - 1);
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111 // Shift them in to place.
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112 upperVal <<= numBitsFirstVal;
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113
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114 return lowerVal | upperVal;
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115 }
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116 }
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117
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118 /// Write a value to memory with a particular endianness, for a location
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119 /// that starts at the given bit offset within the first byte.
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120 template <typename value_type, endianness endian, std::size_t alignment>
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121 inline void writeAtBitAlignment(void *memory, value_type value,
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122 uint64_t startBit) {
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123 assert(startBit < 8);
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124 if (startBit == 0)
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125 write<value_type, endian, alignment>(memory, value);
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126 else {
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127 // Read two values and shift the result into them.
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128 value_type val[2];
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129 memcpy(&val[0],
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130 LLVM_ASSUME_ALIGNED(
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131 memory, (detail::PickAlignment<value_type, alignment>::value)),
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132 sizeof(value_type) * 2);
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133 val[0] = byte_swap<value_type, endian>(val[0]);
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134 val[1] = byte_swap<value_type, endian>(val[1]);
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135
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136 // Mask off any existing bits in the upper part of the lower value that
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137 // we want to replace.
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138 val[0] &= ((make_unsigned_t<value_type>)1 << startBit) - 1;
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139 make_unsigned_t<value_type> numBitsFirstVal =
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140 (sizeof(value_type) * 8) - startBit;
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141 make_unsigned_t<value_type> lowerVal = value;
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142 if (startBit > 0) {
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143 // Mask off the upper bits in the new value that are not going to go into
|
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144 // the lower value. This avoids a left shift of a negative value, which
|
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145 // is undefined behavior.
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146 lowerVal &= (((make_unsigned_t<value_type>)1 << numBitsFirstVal) - 1);
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147 // Now shift the new bits into place
|
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148 lowerVal <<= startBit;
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149 }
|
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150 val[0] |= lowerVal;
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151
|
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152 // Mask off any existing bits in the lower part of the upper value that
|
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153 // we want to replace.
|
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154 val[1] &= ~(((make_unsigned_t<value_type>)1 << startBit) - 1);
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155 // Next shift the bits that go into the upper value into position.
|
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156 make_unsigned_t<value_type> upperVal = value >> numBitsFirstVal;
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157 // Mask off upper bits after right shift in case of signed type.
|
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158 upperVal &= ((make_unsigned_t<value_type>)1 << startBit) - 1;
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159 val[1] |= upperVal;
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160
|
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161 // Finally, rewrite values.
|
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162 val[0] = byte_swap<value_type, endian>(val[0]);
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163 val[1] = byte_swap<value_type, endian>(val[1]);
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164 memcpy(LLVM_ASSUME_ALIGNED(
|
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165 memory, (detail::PickAlignment<value_type, alignment>::value)),
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166 &val[0], sizeof(value_type) * 2);
|
|
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167 }
|
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168 }
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169 } // end namespace endian
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170
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171 namespace detail {
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172 template<typename value_type,
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173 endianness endian,
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174 std::size_t alignment>
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175 struct packed_endian_specific_integral {
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176 operator value_type() const {
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177 return endian::read<value_type, endian, alignment>(
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178 (const void*)Value.buffer);
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179 }
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180
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181 void operator=(value_type newValue) {
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182 endian::write<value_type, endian, alignment>(
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183 (void*)Value.buffer, newValue);
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184 }
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185
|
|
83
|
186 packed_endian_specific_integral &operator+=(value_type newValue) {
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187 *this = *this + newValue;
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188 return *this;
|
|
|
189 }
|
|
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190
|
|
|
191 packed_endian_specific_integral &operator-=(value_type newValue) {
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192 *this = *this - newValue;
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193 return *this;
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194 }
|
|
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195
|
|
95
|
196 packed_endian_specific_integral &operator|=(value_type newValue) {
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197 *this = *this | newValue;
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198 return *this;
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|
|
199 }
|
|
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200
|
|
|
201 packed_endian_specific_integral &operator&=(value_type newValue) {
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|
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202 *this = *this & newValue;
|
|
|
203 return *this;
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|
|
204 }
|
|
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205
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206 private:
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207 AlignedCharArray<PickAlignment<value_type, alignment>::value,
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208 sizeof(value_type)> Value;
|
|
77
|
209
|
|
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210 public:
|
|
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211 struct ref {
|
|
|
212 explicit ref(void *Ptr) : Ptr(Ptr) {}
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213
|
|
|
214 operator value_type() const {
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|
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215 return endian::read<value_type, endian, alignment>(Ptr);
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|
216 }
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217
|
|
|
218 void operator=(value_type NewValue) {
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|
|
219 endian::write<value_type, endian, alignment>(Ptr, NewValue);
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|
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220 }
|
|
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221
|
|
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222 private:
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|
|
223 void *Ptr;
|
|
|
224 };
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225 };
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|
77
|
226
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227 } // end namespace detail
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228
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229 typedef detail::packed_endian_specific_integral
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230 <uint16_t, little, unaligned> ulittle16_t;
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231 typedef detail::packed_endian_specific_integral
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232 <uint32_t, little, unaligned> ulittle32_t;
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233 typedef detail::packed_endian_specific_integral
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234 <uint64_t, little, unaligned> ulittle64_t;
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235
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236 typedef detail::packed_endian_specific_integral
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237 <int16_t, little, unaligned> little16_t;
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238 typedef detail::packed_endian_specific_integral
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239 <int32_t, little, unaligned> little32_t;
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240 typedef detail::packed_endian_specific_integral
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241 <int64_t, little, unaligned> little64_t;
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242
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243 typedef detail::packed_endian_specific_integral
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244 <uint16_t, little, aligned> aligned_ulittle16_t;
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245 typedef detail::packed_endian_specific_integral
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246 <uint32_t, little, aligned> aligned_ulittle32_t;
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247 typedef detail::packed_endian_specific_integral
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248 <uint64_t, little, aligned> aligned_ulittle64_t;
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249
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250 typedef detail::packed_endian_specific_integral
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251 <int16_t, little, aligned> aligned_little16_t;
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252 typedef detail::packed_endian_specific_integral
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253 <int32_t, little, aligned> aligned_little32_t;
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254 typedef detail::packed_endian_specific_integral
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255 <int64_t, little, aligned> aligned_little64_t;
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256
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257 typedef detail::packed_endian_specific_integral
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258 <uint16_t, big, unaligned> ubig16_t;
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259 typedef detail::packed_endian_specific_integral
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260 <uint32_t, big, unaligned> ubig32_t;
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261 typedef detail::packed_endian_specific_integral
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262 <uint64_t, big, unaligned> ubig64_t;
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263
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264 typedef detail::packed_endian_specific_integral
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265 <int16_t, big, unaligned> big16_t;
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266 typedef detail::packed_endian_specific_integral
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267 <int32_t, big, unaligned> big32_t;
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268 typedef detail::packed_endian_specific_integral
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269 <int64_t, big, unaligned> big64_t;
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270
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271 typedef detail::packed_endian_specific_integral
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272 <uint16_t, big, aligned> aligned_ubig16_t;
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273 typedef detail::packed_endian_specific_integral
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274 <uint32_t, big, aligned> aligned_ubig32_t;
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275 typedef detail::packed_endian_specific_integral
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276 <uint64_t, big, aligned> aligned_ubig64_t;
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277
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278 typedef detail::packed_endian_specific_integral
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279 <int16_t, big, aligned> aligned_big16_t;
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280 typedef detail::packed_endian_specific_integral
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281 <int32_t, big, aligned> aligned_big32_t;
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282 typedef detail::packed_endian_specific_integral
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283 <int64_t, big, aligned> aligned_big64_t;
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284
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285 typedef detail::packed_endian_specific_integral
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286 <uint16_t, native, unaligned> unaligned_uint16_t;
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287 typedef detail::packed_endian_specific_integral
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288 <uint32_t, native, unaligned> unaligned_uint32_t;
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289 typedef detail::packed_endian_specific_integral
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290 <uint64_t, native, unaligned> unaligned_uint64_t;
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291
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292 typedef detail::packed_endian_specific_integral
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293 <int16_t, native, unaligned> unaligned_int16_t;
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294 typedef detail::packed_endian_specific_integral
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295 <int32_t, native, unaligned> unaligned_int32_t;
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296 typedef detail::packed_endian_specific_integral
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297 <int64_t, native, unaligned> unaligned_int64_t;
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298
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299 namespace endian {
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300 inline uint16_t read16le(const void *p) { return *(const ulittle16_t *)p; }
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301 inline uint32_t read32le(const void *p) { return *(const ulittle32_t *)p; }
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302 inline uint64_t read64le(const void *p) { return *(const ulittle64_t *)p; }
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303 inline uint16_t read16be(const void *p) { return *(const ubig16_t *)p; }
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304 inline uint32_t read32be(const void *p) { return *(const ubig32_t *)p; }
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305 inline uint64_t read64be(const void *p) { return *(const ubig64_t *)p; }
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306
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307 inline void write16le(void *p, uint16_t v) { *(ulittle16_t *)p = v; }
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308 inline void write32le(void *p, uint32_t v) { *(ulittle32_t *)p = v; }
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309 inline void write64le(void *p, uint64_t v) { *(ulittle64_t *)p = v; }
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310 inline void write16be(void *p, uint16_t v) { *(ubig16_t *)p = v; }
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311 inline void write32be(void *p, uint32_t v) { *(ubig32_t *)p = v; }
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312 inline void write64be(void *p, uint64_t v) { *(ubig64_t *)p = v; }
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313 } // end namespace endian
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314 } // end namespace support
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315 } // end namespace llvm
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316
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317 #endif
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