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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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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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121
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17 #include "llvm/Support/AlignOf.h"
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18 #include "llvm/Support/Compiler.h"
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19 #include "llvm/Support/Host.h"
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20 #include "llvm/Support/SwapByteOrder.h"
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121
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21 #include <cassert>
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22 #include <cstddef>
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23 #include <cstdint>
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24 #include <cstring>
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25 #include <type_traits>
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26
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27 namespace llvm {
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28 namespace support {
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121
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29
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30 enum endianness {big, little, native};
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31
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32 // These are named values for common alignments.
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33 enum {aligned = 0, unaligned = 1};
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34
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35 namespace detail {
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121
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36
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37 /// \brief ::value is either alignment, or alignof(T) if alignment is 0.
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38 template<class T, int alignment>
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39 struct PickAlignment {
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40 enum { value = alignment == 0 ? alignof(T) : alignment };
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41 };
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42
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43 } // end namespace detail
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44
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45 namespace endian {
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121
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46
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47 constexpr endianness system_endianness() {
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48 return sys::IsBigEndianHost ? big : little;
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49 }
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50
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51 template <typename value_type>
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52 inline value_type byte_swap(value_type value, endianness endian) {
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53 if ((endian != native) && (endian != system_endianness()))
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77
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54 sys::swapByteOrder(value);
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55 return value;
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56 }
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57
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121
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58 /// Swap the bytes of value to match the given endianness.
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59 template<typename value_type, endianness endian>
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60 inline value_type byte_swap(value_type value) {
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61 return byte_swap(value, endian);
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62 }
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63
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77
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64 /// Read a value of a particular endianness from memory.
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121
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65 template <typename value_type, std::size_t alignment>
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66 inline value_type read(const void *memory, endianness endian) {
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67 value_type ret;
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68
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69 memcpy(&ret,
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70 LLVM_ASSUME_ALIGNED(
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71 memory, (detail::PickAlignment<value_type, alignment>::value)),
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72 sizeof(value_type));
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73 return byte_swap<value_type>(ret, endian);
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74 }
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75
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76 template<typename value_type,
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77 endianness endian,
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78 std::size_t alignment>
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79 inline value_type read(const void *memory) {
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121
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80 return read<value_type, alignment>(memory, endian);
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81 }
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82
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77
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83 /// Read a value of a particular endianness from a buffer, and increment the
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84 /// buffer past that value.
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121
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85 template <typename value_type, std::size_t alignment, typename CharT>
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86 inline value_type readNext(const CharT *&memory, endianness endian) {
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87 value_type ret = read<value_type, alignment>(memory, endian);
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77
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88 memory += sizeof(value_type);
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89 return ret;
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90 }
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91
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121
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92 template<typename value_type, endianness endian, std::size_t alignment,
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93 typename CharT>
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94 inline value_type readNext(const CharT *&memory) {
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95 return readNext<value_type, alignment, CharT>(memory, endian);
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96 }
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97
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77
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98 /// Write a value to memory with a particular endianness.
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121
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99 template <typename value_type, std::size_t alignment>
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100 inline void write(void *memory, value_type value, endianness endian) {
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101 value = byte_swap<value_type>(value, endian);
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102 memcpy(LLVM_ASSUME_ALIGNED(
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103 memory, (detail::PickAlignment<value_type, alignment>::value)),
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104 &value, sizeof(value_type));
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105 }
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106
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107 template<typename value_type,
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108 endianness endian,
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109 std::size_t alignment>
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110 inline void write(void *memory, value_type value) {
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121
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111 write<value_type, alignment>(memory, value, endian);
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112 }
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95
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113
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114 template <typename value_type>
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115 using make_unsigned_t = typename std::make_unsigned<value_type>::type;
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116
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117 /// Read a value of a particular endianness from memory, for a location
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118 /// that starts at the given bit offset within the first byte.
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119 template <typename value_type, endianness endian, std::size_t alignment>
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120 inline value_type readAtBitAlignment(const void *memory, uint64_t startBit) {
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121 assert(startBit < 8);
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122 if (startBit == 0)
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123 return read<value_type, endian, alignment>(memory);
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124 else {
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125 // Read two values and compose the result from them.
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126 value_type val[2];
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127 memcpy(&val[0],
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128 LLVM_ASSUME_ALIGNED(
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129 memory, (detail::PickAlignment<value_type, alignment>::value)),
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130 sizeof(value_type) * 2);
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131 val[0] = byte_swap<value_type, endian>(val[0]);
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132 val[1] = byte_swap<value_type, endian>(val[1]);
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133
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134 // Shift bits from the lower value into place.
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135 make_unsigned_t<value_type> lowerVal = val[0] >> startBit;
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136 // Mask off upper bits after right shift in case of signed type.
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137 make_unsigned_t<value_type> numBitsFirstVal =
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138 (sizeof(value_type) * 8) - startBit;
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139 lowerVal &= ((make_unsigned_t<value_type>)1 << numBitsFirstVal) - 1;
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140
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141 // Get the bits from the upper value.
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142 make_unsigned_t<value_type> upperVal =
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143 val[1] & (((make_unsigned_t<value_type>)1 << startBit) - 1);
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144 // Shift them in to place.
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145 upperVal <<= numBitsFirstVal;
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146
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147 return lowerVal | upperVal;
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148 }
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149 }
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150
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151 /// Write a value to memory with a particular endianness, for a location
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152 /// that starts at the given bit offset within the first byte.
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153 template <typename value_type, endianness endian, std::size_t alignment>
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154 inline void writeAtBitAlignment(void *memory, value_type value,
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155 uint64_t startBit) {
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156 assert(startBit < 8);
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157 if (startBit == 0)
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158 write<value_type, endian, alignment>(memory, value);
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159 else {
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160 // Read two values and shift the result into them.
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161 value_type val[2];
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162 memcpy(&val[0],
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163 LLVM_ASSUME_ALIGNED(
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164 memory, (detail::PickAlignment<value_type, alignment>::value)),
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165 sizeof(value_type) * 2);
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166 val[0] = byte_swap<value_type, endian>(val[0]);
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167 val[1] = byte_swap<value_type, endian>(val[1]);
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168
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169 // Mask off any existing bits in the upper part of the lower value that
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170 // we want to replace.
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171 val[0] &= ((make_unsigned_t<value_type>)1 << startBit) - 1;
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172 make_unsigned_t<value_type> numBitsFirstVal =
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173 (sizeof(value_type) * 8) - startBit;
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174 make_unsigned_t<value_type> lowerVal = value;
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175 if (startBit > 0) {
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176 // Mask off the upper bits in the new value that are not going to go into
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177 // the lower value. This avoids a left shift of a negative value, which
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178 // is undefined behavior.
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179 lowerVal &= (((make_unsigned_t<value_type>)1 << numBitsFirstVal) - 1);
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180 // Now shift the new bits into place
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181 lowerVal <<= startBit;
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182 }
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183 val[0] |= lowerVal;
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184
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185 // Mask off any existing bits in the lower part of the upper value that
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186 // we want to replace.
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187 val[1] &= ~(((make_unsigned_t<value_type>)1 << startBit) - 1);
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188 // Next shift the bits that go into the upper value into position.
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189 make_unsigned_t<value_type> upperVal = value >> numBitsFirstVal;
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190 // Mask off upper bits after right shift in case of signed type.
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191 upperVal &= ((make_unsigned_t<value_type>)1 << startBit) - 1;
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192 val[1] |= upperVal;
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193
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194 // Finally, rewrite values.
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195 val[0] = byte_swap<value_type, endian>(val[0]);
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196 val[1] = byte_swap<value_type, endian>(val[1]);
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197 memcpy(LLVM_ASSUME_ALIGNED(
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198 memory, (detail::PickAlignment<value_type, alignment>::value)),
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199 &val[0], sizeof(value_type) * 2);
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200 }
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201 }
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121
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202
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203 } // end namespace endian
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204
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205 namespace detail {
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121
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206
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207 template<typename value_type,
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208 endianness endian,
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209 std::size_t alignment>
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210 struct packed_endian_specific_integral {
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100
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211 packed_endian_specific_integral() = default;
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212
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213 explicit packed_endian_specific_integral(value_type val) { *this = val; }
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214
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215 operator value_type() const {
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216 return endian::read<value_type, endian, alignment>(
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217 (const void*)Value.buffer);
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218 }
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219
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220 void operator=(value_type newValue) {
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221 endian::write<value_type, endian, alignment>(
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222 (void*)Value.buffer, newValue);
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223 }
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224
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83
|
225 packed_endian_specific_integral &operator+=(value_type newValue) {
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226 *this = *this + newValue;
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227 return *this;
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228 }
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229
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230 packed_endian_specific_integral &operator-=(value_type newValue) {
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231 *this = *this - newValue;
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232 return *this;
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233 }
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234
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95
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235 packed_endian_specific_integral &operator|=(value_type newValue) {
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236 *this = *this | newValue;
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237 return *this;
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238 }
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239
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240 packed_endian_specific_integral &operator&=(value_type newValue) {
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241 *this = *this & newValue;
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242 return *this;
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243 }
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244
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245 private:
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246 AlignedCharArray<PickAlignment<value_type, alignment>::value,
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247 sizeof(value_type)> Value;
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77
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248
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249 public:
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250 struct ref {
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251 explicit ref(void *Ptr) : Ptr(Ptr) {}
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252
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253 operator value_type() const {
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254 return endian::read<value_type, endian, alignment>(Ptr);
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255 }
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256
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257 void operator=(value_type NewValue) {
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258 endian::write<value_type, endian, alignment>(Ptr, NewValue);
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259 }
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260
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261 private:
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262 void *Ptr;
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263 };
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264 };
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77
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265
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266 } // end namespace detail
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267
|
|
121
|
268 using ulittle16_t =
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269 detail::packed_endian_specific_integral<uint16_t, little, unaligned>;
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|
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270 using ulittle32_t =
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271 detail::packed_endian_specific_integral<uint32_t, little, unaligned>;
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|
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272 using ulittle64_t =
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273 detail::packed_endian_specific_integral<uint64_t, little, unaligned>;
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274
|
|
121
|
275 using little16_t =
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|
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276 detail::packed_endian_specific_integral<int16_t, little, unaligned>;
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|
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277 using little32_t =
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|
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278 detail::packed_endian_specific_integral<int32_t, little, unaligned>;
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|
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279 using little64_t =
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280 detail::packed_endian_specific_integral<int64_t, little, unaligned>;
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281
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282 using aligned_ulittle16_t =
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283 detail::packed_endian_specific_integral<uint16_t, little, aligned>;
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284 using aligned_ulittle32_t =
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285 detail::packed_endian_specific_integral<uint32_t, little, aligned>;
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286 using aligned_ulittle64_t =
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287 detail::packed_endian_specific_integral<uint64_t, little, aligned>;
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288
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289 using aligned_little16_t =
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290 detail::packed_endian_specific_integral<int16_t, little, aligned>;
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291 using aligned_little32_t =
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292 detail::packed_endian_specific_integral<int32_t, little, aligned>;
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293 using aligned_little64_t =
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294 detail::packed_endian_specific_integral<int64_t, little, aligned>;
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295
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296 using ubig16_t =
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297 detail::packed_endian_specific_integral<uint16_t, big, unaligned>;
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298 using ubig32_t =
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299 detail::packed_endian_specific_integral<uint32_t, big, unaligned>;
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300 using ubig64_t =
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301 detail::packed_endian_specific_integral<uint64_t, big, unaligned>;
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302
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303 using big16_t =
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304 detail::packed_endian_specific_integral<int16_t, big, unaligned>;
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305 using big32_t =
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306 detail::packed_endian_specific_integral<int32_t, big, unaligned>;
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307 using big64_t =
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308 detail::packed_endian_specific_integral<int64_t, big, unaligned>;
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309
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310 using aligned_ubig16_t =
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311 detail::packed_endian_specific_integral<uint16_t, big, aligned>;
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312 using aligned_ubig32_t =
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313 detail::packed_endian_specific_integral<uint32_t, big, aligned>;
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314 using aligned_ubig64_t =
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315 detail::packed_endian_specific_integral<uint64_t, big, aligned>;
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316
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317 using aligned_big16_t =
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318 detail::packed_endian_specific_integral<int16_t, big, aligned>;
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319 using aligned_big32_t =
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320 detail::packed_endian_specific_integral<int32_t, big, aligned>;
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321 using aligned_big64_t =
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322 detail::packed_endian_specific_integral<int64_t, big, aligned>;
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323
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324 using unaligned_uint16_t =
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325 detail::packed_endian_specific_integral<uint16_t, native, unaligned>;
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326 using unaligned_uint32_t =
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327 detail::packed_endian_specific_integral<uint32_t, native, unaligned>;
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328 using unaligned_uint64_t =
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329 detail::packed_endian_specific_integral<uint64_t, native, unaligned>;
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330
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331 using unaligned_int16_t =
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332 detail::packed_endian_specific_integral<int16_t, native, unaligned>;
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333 using unaligned_int32_t =
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334 detail::packed_endian_specific_integral<int32_t, native, unaligned>;
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335 using unaligned_int64_t =
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336 detail::packed_endian_specific_integral<int64_t, native, unaligned>;
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337
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338 namespace endian {
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339
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340 template <typename T> inline T read(const void *P, endianness E) {
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341 return read<T, unaligned>(P, E);
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342 }
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343
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344 template <typename T, endianness E> inline T read(const void *P) {
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345 return *(const detail::packed_endian_specific_integral<T, E, unaligned> *)P;
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346 }
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347
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348 inline uint16_t read16(const void *P, endianness E) {
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349 return read<uint16_t>(P, E);
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350 }
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351 inline uint32_t read32(const void *P, endianness E) {
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352 return read<uint32_t>(P, E);
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353 }
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354 inline uint64_t read64(const void *P, endianness E) {
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355 return read<uint64_t>(P, E);
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356 }
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357
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358 template <endianness E> inline uint16_t read16(const void *P) {
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359 return read<uint16_t, E>(P);
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360 }
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361 template <endianness E> inline uint32_t read32(const void *P) {
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362 return read<uint32_t, E>(P);
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363 }
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364 template <endianness E> inline uint64_t read64(const void *P) {
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365 return read<uint64_t, E>(P);
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366 }
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367
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368 inline uint16_t read16le(const void *P) { return read16<little>(P); }
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369 inline uint32_t read32le(const void *P) { return read32<little>(P); }
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370 inline uint64_t read64le(const void *P) { return read64<little>(P); }
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371 inline uint16_t read16be(const void *P) { return read16<big>(P); }
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372 inline uint32_t read32be(const void *P) { return read32<big>(P); }
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373 inline uint64_t read64be(const void *P) { return read64<big>(P); }
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374
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375 template <typename T> inline void write(void *P, T V, endianness E) {
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376 write<T, unaligned>(P, V, E);
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377 }
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378
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379 template <typename T, endianness E> inline void write(void *P, T V) {
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380 *(detail::packed_endian_specific_integral<T, E, unaligned> *)P = V;
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381 }
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382
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383 inline void write16(void *P, uint16_t V, endianness E) {
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384 write<uint16_t>(P, V, E);
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385 }
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386 inline void write32(void *P, uint32_t V, endianness E) {
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387 write<uint32_t>(P, V, E);
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388 }
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389 inline void write64(void *P, uint64_t V, endianness E) {
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390 write<uint64_t>(P, V, E);
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391 }
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392
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393 template <endianness E> inline void write16(void *P, uint16_t V) {
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394 write<uint16_t, E>(P, V);
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395 }
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396 template <endianness E> inline void write32(void *P, uint32_t V) {
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397 write<uint32_t, E>(P, V);
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398 }
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399 template <endianness E> inline void write64(void *P, uint64_t V) {
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400 write<uint64_t, E>(P, V);
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401 }
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402
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403 inline void write16le(void *P, uint16_t V) { write16<little>(P, V); }
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404 inline void write32le(void *P, uint32_t V) { write32<little>(P, V); }
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405 inline void write64le(void *P, uint64_t V) { write64<little>(P, V); }
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406 inline void write16be(void *P, uint16_t V) { write16<big>(P, V); }
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407 inline void write32be(void *P, uint32_t V) { write32<big>(P, V); }
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408 inline void write64be(void *P, uint64_t V) { write64<big>(P, V); }
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409
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410 } // end namespace endian
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411
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412 } // end namespace support
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413 } // end namespace llvm
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414
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415 #endif // LLVM_SUPPORT_ENDIAN_H
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