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1 //===-- sanitizer_internal_defs.h -------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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111
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file is shared between AddressSanitizer and ThreadSanitizer.
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10 // It contains macro used in run-time libraries code.
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11 //===----------------------------------------------------------------------===//
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12 #ifndef SANITIZER_DEFS_H
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13 #define SANITIZER_DEFS_H
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14
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15 #include "sanitizer_platform.h"
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16
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17 #ifndef SANITIZER_DEBUG
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18 # define SANITIZER_DEBUG 0
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19 #endif
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20
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21 #define SANITIZER_STRINGIFY_(S) #S
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22 #define SANITIZER_STRINGIFY(S) SANITIZER_STRINGIFY_(S)
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23
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111
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24 // Only use SANITIZER_*ATTRIBUTE* before the function return type!
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25 #if SANITIZER_WINDOWS
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26 #if SANITIZER_IMPORT_INTERFACE
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27 # define SANITIZER_INTERFACE_ATTRIBUTE __declspec(dllimport)
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28 #else
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29 # define SANITIZER_INTERFACE_ATTRIBUTE __declspec(dllexport)
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30 #endif
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31 # define SANITIZER_WEAK_ATTRIBUTE
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32 #elif SANITIZER_GO
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33 # define SANITIZER_INTERFACE_ATTRIBUTE
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34 # define SANITIZER_WEAK_ATTRIBUTE
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35 #else
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36 # define SANITIZER_INTERFACE_ATTRIBUTE __attribute__((visibility("default")))
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37 # define SANITIZER_WEAK_ATTRIBUTE __attribute__((weak))
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38 #endif
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39
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40 // TLS is handled differently on different platforms
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41 #if SANITIZER_LINUX || SANITIZER_NETBSD || \
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42 SANITIZER_FREEBSD || SANITIZER_OPENBSD
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43 # define SANITIZER_TLS_INITIAL_EXEC_ATTRIBUTE \
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44 __attribute__((tls_model("initial-exec"))) thread_local
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45 #else
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46 # define SANITIZER_TLS_INITIAL_EXEC_ATTRIBUTE
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47 #endif
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48
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49 //--------------------------- WEAK FUNCTIONS ---------------------------------//
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50 // When working with weak functions, to simplify the code and make it more
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51 // portable, when possible define a default implementation using this macro:
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52 //
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53 // SANITIZER_INTERFACE_WEAK_DEF(<return_type>, <name>, <parameter list>)
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54 //
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55 // For example:
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56 // SANITIZER_INTERFACE_WEAK_DEF(bool, compare, int a, int b) { return a > b; }
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57 //
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58 #if SANITIZER_WINDOWS
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59 #include "sanitizer_win_defs.h"
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60 # define SANITIZER_INTERFACE_WEAK_DEF(ReturnType, Name, ...) \
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61 WIN_WEAK_EXPORT_DEF(ReturnType, Name, __VA_ARGS__)
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62 #else
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63 # define SANITIZER_INTERFACE_WEAK_DEF(ReturnType, Name, ...) \
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64 extern "C" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE \
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65 ReturnType Name(__VA_ARGS__)
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66 #endif
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67
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68 // SANITIZER_SUPPORTS_WEAK_HOOKS means that we support real weak functions that
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69 // will evaluate to a null pointer when not defined.
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70 #ifndef SANITIZER_SUPPORTS_WEAK_HOOKS
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145
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71 #if (SANITIZER_LINUX || SANITIZER_SOLARIS) && !SANITIZER_GO
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72 # define SANITIZER_SUPPORTS_WEAK_HOOKS 1
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73 // Before Xcode 4.5, the Darwin linker doesn't reliably support undefined
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74 // weak symbols. Mac OS X 10.9/Darwin 13 is the first release only supported
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75 // by Xcode >= 4.5.
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76 #elif SANITIZER_MAC && \
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77 __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1090 && !SANITIZER_GO
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78 # define SANITIZER_SUPPORTS_WEAK_HOOKS 1
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79 #else
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80 # define SANITIZER_SUPPORTS_WEAK_HOOKS 0
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81 #endif
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82 #endif // SANITIZER_SUPPORTS_WEAK_HOOKS
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83 // For some weak hooks that will be called very often and we want to avoid the
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84 // overhead of executing the default implementation when it is not necessary,
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85 // we can use the flag SANITIZER_SUPPORTS_WEAK_HOOKS to only define the default
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86 // implementation for platforms that doesn't support weak symbols. For example:
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87 //
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88 // #if !SANITIZER_SUPPORT_WEAK_HOOKS
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89 // SANITIZER_INTERFACE_WEAK_DEF(bool, compare_hook, int a, int b) {
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90 // return a > b;
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91 // }
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92 // #endif
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93 //
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94 // And then use it as: if (compare_hook) compare_hook(a, b);
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95 //----------------------------------------------------------------------------//
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96
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97
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98 // We can use .preinit_array section on Linux to call sanitizer initialization
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99 // functions very early in the process startup (unless PIC macro is defined).
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145
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100 //
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101 // On FreeBSD, .preinit_array functions are called with rtld_bind_lock writer
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102 // lock held. It will lead to dead lock if unresolved PLT functions (which helds
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103 // rtld_bind_lock reader lock) are called inside .preinit_array functions.
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104 //
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105 // FIXME: do we have anything like this on Mac?
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106 #ifndef SANITIZER_CAN_USE_PREINIT_ARRAY
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107 #if ((SANITIZER_LINUX && !SANITIZER_ANDROID) || SANITIZER_OPENBSD || \
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108 SANITIZER_FUCHSIA) && !defined(PIC)
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109 #define SANITIZER_CAN_USE_PREINIT_ARRAY 1
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110 // Before Solaris 11.4, .preinit_array is fully supported only with GNU ld.
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111 // FIXME: Check for those conditions.
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112 #elif SANITIZER_SOLARIS && !defined(PIC)
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111
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113 # define SANITIZER_CAN_USE_PREINIT_ARRAY 1
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114 #else
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115 # define SANITIZER_CAN_USE_PREINIT_ARRAY 0
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116 #endif
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117 #endif // SANITIZER_CAN_USE_PREINIT_ARRAY
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111
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118
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119 // GCC does not understand __has_feature
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120 #if !defined(__has_feature)
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121 # define __has_feature(x) 0
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122 #endif
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123
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131
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124 // Older GCCs do not understand __has_attribute.
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125 #if !defined(__has_attribute)
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126 # define __has_attribute(x) 0
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127 #endif
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128
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129 // For portability reasons we do not include stddef.h, stdint.h or any other
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130 // system header, but we do need some basic types that are not defined
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131 // in a portable way by the language itself.
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132 namespace __sanitizer {
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133
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134 #if defined(_WIN64)
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135 // 64-bit Windows uses LLP64 data model.
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136 typedef unsigned long long uptr;
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137 typedef signed long long sptr;
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111
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138 #else
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139 typedef unsigned long uptr;
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140 typedef signed long sptr;
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111
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141 #endif // defined(_WIN64)
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142 #if defined(__x86_64__)
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143 // Since x32 uses ILP32 data model in 64-bit hardware mode, we must use
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144 // 64-bit pointer to unwind stack frame.
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145
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145 typedef unsigned long long uhwptr;
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111
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146 #else
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145
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147 typedef uptr uhwptr;
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111
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148 #endif
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149 typedef unsigned char u8;
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145
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150 typedef unsigned short u16;
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111
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151 typedef unsigned int u32;
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145
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152 typedef unsigned long long u64;
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153 typedef signed char s8;
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154 typedef signed short s16;
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155 typedef signed int s32;
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156 typedef signed long long s64;
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111
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157 #if SANITIZER_WINDOWS
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158 // On Windows, files are HANDLE, which is a synonim of void*.
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159 // Use void* to avoid including <windows.h> everywhere.
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160 typedef void* fd_t;
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161 typedef unsigned error_t;
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162 #else
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163 typedef int fd_t;
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164 typedef int error_t;
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165 #endif
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166 #if SANITIZER_SOLARIS && !defined(_LP64)
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167 typedef long pid_t;
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168 #else
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169 typedef int pid_t;
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170 #endif
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111
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171
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172 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || \
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173 SANITIZER_OPENBSD || SANITIZER_MAC || \
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174 (SANITIZER_SOLARIS && (defined(_LP64) || _FILE_OFFSET_BITS == 64)) || \
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175 (SANITIZER_LINUX && defined(__x86_64__))
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176 typedef u64 OFF_T;
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177 #else
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178 typedef uptr OFF_T;
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179 #endif
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180 typedef u64 OFF64_T;
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181
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182 #if (SANITIZER_WORDSIZE == 64) || SANITIZER_MAC
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183 typedef uptr operator_new_size_type;
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184 #else
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185 # if SANITIZER_OPENBSD || defined(__s390__) && !defined(__s390x__)
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111
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186 // Special case: 31-bit s390 has unsigned long as size_t.
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187 typedef unsigned long operator_new_size_type;
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188 # else
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189 typedef u32 operator_new_size_type;
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190 # endif
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191 #endif
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192
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193 typedef u64 tid_t;
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194
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195 // ----------- ATTENTION -------------
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196 // This header should NOT include any other headers to avoid portability issues.
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197
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198 // Common defs.
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199 #ifndef INLINE
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200 #define INLINE inline
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201 #endif
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111
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202 #define INTERFACE_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE
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203 #define SANITIZER_WEAK_DEFAULT_IMPL \
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204 extern "C" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE NOINLINE
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205 #define SANITIZER_WEAK_CXX_DEFAULT_IMPL \
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206 extern "C++" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE NOINLINE
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207
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208 // Platform-specific defs.
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209 #if defined(_MSC_VER)
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210 # define ALWAYS_INLINE __forceinline
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211 // FIXME(timurrrr): do we need this on Windows?
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212 # define ALIAS(x)
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213 # define ALIGNED(x) __declspec(align(x))
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214 # define FORMAT(f, a)
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215 # define NOINLINE __declspec(noinline)
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216 # define NORETURN __declspec(noreturn)
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217 # define THREADLOCAL __declspec(thread)
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218 # define LIKELY(x) (x)
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219 # define UNLIKELY(x) (x)
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220 # define PREFETCH(x) /* _mm_prefetch(x, _MM_HINT_NTA) */ (void)0
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221 # define WARN_UNUSED_RESULT
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111
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222 #else // _MSC_VER
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223 # define ALWAYS_INLINE inline __attribute__((always_inline))
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224 # define ALIAS(x) __attribute__((alias(x)))
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225 // Please only use the ALIGNED macro before the type.
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226 // Using ALIGNED after the variable declaration is not portable!
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227 # define ALIGNED(x) __attribute__((aligned(x)))
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228 # define FORMAT(f, a) __attribute__((format(printf, f, a)))
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229 # define NOINLINE __attribute__((noinline))
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230 # define NORETURN __attribute__((noreturn))
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231 # define THREADLOCAL __thread
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232 # define LIKELY(x) __builtin_expect(!!(x), 1)
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233 # define UNLIKELY(x) __builtin_expect(!!(x), 0)
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234 # if defined(__i386__) || defined(__x86_64__)
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235 // __builtin_prefetch(x) generates prefetchnt0 on x86
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236 # define PREFETCH(x) __asm__("prefetchnta (%0)" : : "r" (x))
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237 # else
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238 # define PREFETCH(x) __builtin_prefetch(x)
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239 # endif
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240 # define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
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111
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241 #endif // _MSC_VER
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242
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243 #if !defined(_MSC_VER) || defined(__clang__)
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244 # define UNUSED __attribute__((unused))
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245 # define USED __attribute__((used))
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246 #else
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247 # define UNUSED
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248 # define USED
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249 #endif
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250
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251 #if !defined(_MSC_VER) || defined(__clang__) || MSC_PREREQ(1900)
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252 # define NOEXCEPT noexcept
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253 #else
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254 # define NOEXCEPT throw()
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255 #endif
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256
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257 // Unaligned versions of basic types.
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258 typedef ALIGNED(1) u16 uu16;
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259 typedef ALIGNED(1) u32 uu32;
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260 typedef ALIGNED(1) u64 uu64;
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261 typedef ALIGNED(1) s16 us16;
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262 typedef ALIGNED(1) s32 us32;
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263 typedef ALIGNED(1) s64 us64;
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264
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265 #if SANITIZER_WINDOWS
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266 } // namespace __sanitizer
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267 typedef unsigned long DWORD;
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111
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268 namespace __sanitizer {
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269 typedef DWORD thread_return_t;
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270 # define THREAD_CALLING_CONV __stdcall
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271 #else // _WIN32
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272 typedef void* thread_return_t;
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273 # define THREAD_CALLING_CONV
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274 #endif // _WIN32
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275 typedef thread_return_t (THREAD_CALLING_CONV *thread_callback_t)(void* arg);
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276
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277 // NOTE: Functions below must be defined in each run-time.
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278 void NORETURN Die();
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279
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280 void NORETURN CheckFailed(const char *file, int line, const char *cond,
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281 u64 v1, u64 v2);
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282
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283 // Check macro
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284 #define RAW_CHECK_MSG(expr, msg) do { \
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285 if (UNLIKELY(!(expr))) { \
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286 RawWrite(msg); \
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287 Die(); \
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288 } \
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289 } while (0)
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290
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291 #define RAW_CHECK(expr) RAW_CHECK_MSG(expr, #expr)
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292
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293 #define CHECK_IMPL(c1, op, c2) \
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294 do { \
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295 __sanitizer::u64 v1 = (__sanitizer::u64)(c1); \
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296 __sanitizer::u64 v2 = (__sanitizer::u64)(c2); \
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297 if (UNLIKELY(!(v1 op v2))) \
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298 __sanitizer::CheckFailed(__FILE__, __LINE__, \
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299 "(" #c1 ") " #op " (" #c2 ")", v1, v2); \
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300 } while (false) \
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301 /**/
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302
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303 #define CHECK(a) CHECK_IMPL((a), !=, 0)
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304 #define CHECK_EQ(a, b) CHECK_IMPL((a), ==, (b))
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305 #define CHECK_NE(a, b) CHECK_IMPL((a), !=, (b))
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306 #define CHECK_LT(a, b) CHECK_IMPL((a), <, (b))
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307 #define CHECK_LE(a, b) CHECK_IMPL((a), <=, (b))
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308 #define CHECK_GT(a, b) CHECK_IMPL((a), >, (b))
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309 #define CHECK_GE(a, b) CHECK_IMPL((a), >=, (b))
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310
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311 #if SANITIZER_DEBUG
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312 #define DCHECK(a) CHECK(a)
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313 #define DCHECK_EQ(a, b) CHECK_EQ(a, b)
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314 #define DCHECK_NE(a, b) CHECK_NE(a, b)
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315 #define DCHECK_LT(a, b) CHECK_LT(a, b)
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316 #define DCHECK_LE(a, b) CHECK_LE(a, b)
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317 #define DCHECK_GT(a, b) CHECK_GT(a, b)
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318 #define DCHECK_GE(a, b) CHECK_GE(a, b)
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319 #else
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320 #define DCHECK(a)
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321 #define DCHECK_EQ(a, b)
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322 #define DCHECK_NE(a, b)
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323 #define DCHECK_LT(a, b)
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324 #define DCHECK_LE(a, b)
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325 #define DCHECK_GT(a, b)
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326 #define DCHECK_GE(a, b)
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327 #endif
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328
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329 #define UNREACHABLE(msg) do { \
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330 CHECK(0 && msg); \
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331 Die(); \
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332 } while (0)
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333
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334 #define UNIMPLEMENTED() UNREACHABLE("unimplemented")
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335
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336 #define COMPILER_CHECK(pred) IMPL_COMPILER_ASSERT(pred, __LINE__)
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337
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338 #define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
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339
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340 #define IMPL_PASTE(a, b) a##b
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341 #define IMPL_COMPILER_ASSERT(pred, line) \
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342 typedef char IMPL_PASTE(assertion_failed_##_, line)[2*(int)(pred)-1]
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343
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344 // Limits for integral types. We have to redefine it in case we don't
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345 // have stdint.h (like in Visual Studio 9).
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346 #undef __INT64_C
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347 #undef __UINT64_C
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348 #if SANITIZER_WORDSIZE == 64
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349 # define __INT64_C(c) c ## L
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350 # define __UINT64_C(c) c ## UL
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351 #else
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352 # define __INT64_C(c) c ## LL
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353 # define __UINT64_C(c) c ## ULL
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354 #endif // SANITIZER_WORDSIZE == 64
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355 #undef INT32_MIN
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356 #define INT32_MIN (-2147483647-1)
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357 #undef INT32_MAX
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358 #define INT32_MAX (2147483647)
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359 #undef UINT32_MAX
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360 #define UINT32_MAX (4294967295U)
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361 #undef INT64_MIN
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362 #define INT64_MIN (-__INT64_C(9223372036854775807)-1)
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363 #undef INT64_MAX
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364 #define INT64_MAX (__INT64_C(9223372036854775807))
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365 #undef UINT64_MAX
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366 #define UINT64_MAX (__UINT64_C(18446744073709551615))
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145
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367 #undef UINTPTR_MAX
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368 #if SANITIZER_WORDSIZE == 64
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369 # define UINTPTR_MAX (18446744073709551615UL)
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370 #else
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371 # define UINTPTR_MAX (4294967295U)
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372 #endif // SANITIZER_WORDSIZE == 64
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111
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373
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374 enum LinkerInitialized { LINKER_INITIALIZED = 0 };
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375
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376 #if !defined(_MSC_VER) || defined(__clang__)
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377 #if SANITIZER_S390_31
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378 #define GET_CALLER_PC() \
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379 (__sanitizer::uptr) __builtin_extract_return_addr(__builtin_return_address(0))
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380 #else
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381 #define GET_CALLER_PC() (__sanitizer::uptr) __builtin_return_address(0)
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382 #endif
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383 #define GET_CURRENT_FRAME() (__sanitizer::uptr) __builtin_frame_address(0)
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384 inline void Trap() {
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385 __builtin_trap();
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386 }
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387 #else
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388 extern "C" void* _ReturnAddress(void);
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389 extern "C" void* _AddressOfReturnAddress(void);
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390 # pragma intrinsic(_ReturnAddress)
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391 # pragma intrinsic(_AddressOfReturnAddress)
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392 #define GET_CALLER_PC() (__sanitizer::uptr) _ReturnAddress()
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393 // CaptureStackBackTrace doesn't need to know BP on Windows.
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394 #define GET_CURRENT_FRAME() \
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395 (((__sanitizer::uptr)_AddressOfReturnAddress()) + sizeof(__sanitizer::uptr))
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396
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397 extern "C" void __ud2(void);
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398 # pragma intrinsic(__ud2)
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399 inline void Trap() {
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400 __ud2();
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401 }
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402 #endif
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403
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404 #define HANDLE_EINTR(res, f) \
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405 { \
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406 int rverrno; \
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407 do { \
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408 res = (f); \
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409 } while (internal_iserror(res, &rverrno) && rverrno == EINTR); \
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410 }
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411
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412 // Forces the compiler to generate a frame pointer in the function.
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413 #define ENABLE_FRAME_POINTER \
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414 do { \
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415 volatile __sanitizer::uptr enable_fp; \
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416 enable_fp = GET_CURRENT_FRAME(); \
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417 (void)enable_fp; \
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418 } while (0)
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419
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420 } // namespace __sanitizer
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421
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145
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422 namespace __asan {
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423 using namespace __sanitizer;
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424 }
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425 namespace __dsan {
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426 using namespace __sanitizer;
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427 }
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428 namespace __dfsan {
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429 using namespace __sanitizer;
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430 }
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431 namespace __lsan {
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432 using namespace __sanitizer;
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433 }
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434 namespace __msan {
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435 using namespace __sanitizer;
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436 }
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437 namespace __hwasan {
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438 using namespace __sanitizer;
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439 }
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440 namespace __tsan {
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441 using namespace __sanitizer;
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442 }
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443 namespace __scudo {
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444 using namespace __sanitizer;
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445 }
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446 namespace __ubsan {
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447 using namespace __sanitizer;
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448 }
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449 namespace __xray {
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450 using namespace __sanitizer;
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451 }
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452 namespace __interception {
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453 using namespace __sanitizer;
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454 }
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455 namespace __hwasan {
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456 using namespace __sanitizer;
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457 }
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111
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458
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459 #endif // SANITIZER_DEFS_H
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