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annotate include/llvm/Support/Compiler.h @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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1 //===-- llvm/Support/Compiler.h - Compiler abstraction support --*- C++ -*-===//
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2 //
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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 defines several macros, based on the current compiler. This allows
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11 // use of compiler-specific features in a way that remains portable.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #ifndef LLVM_SUPPORT_COMPILER_H
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16 #define LLVM_SUPPORT_COMPILER_H
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17
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18 #include "llvm/Config/llvm-config.h"
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19
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20 #ifndef __has_feature
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21 # define __has_feature(x) 0
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22 #endif
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23
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24 #ifndef __has_extension
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25 # define __has_extension(x) 0
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26 #endif
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27
0
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28 #ifndef __has_attribute
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29 # define __has_attribute(x) 0
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30 #endif
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31
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32 #ifndef __has_builtin
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33 # define __has_builtin(x) 0
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34 #endif
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35
83
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36 /// \macro LLVM_GNUC_PREREQ
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37 /// \brief Extend the default __GNUC_PREREQ even if glibc's features.h isn't
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38 /// available.
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39 #ifndef LLVM_GNUC_PREREQ
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40 # if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
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41 # define LLVM_GNUC_PREREQ(maj, min, patch) \
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42 ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \
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43 ((maj) << 20) + ((min) << 10) + (patch))
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44 # elif defined(__GNUC__) && defined(__GNUC_MINOR__)
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45 # define LLVM_GNUC_PREREQ(maj, min, patch) \
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46 ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
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47 # else
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48 # define LLVM_GNUC_PREREQ(maj, min, patch) 0
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49 # endif
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50 #endif
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51
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52 /// \macro LLVM_MSC_PREREQ
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53 /// \brief Is the compiler MSVC of at least the specified version?
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54 /// The common \param version values to check for are:
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55 /// * 1800: Microsoft Visual Studio 2013 / 12.0
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56 /// * 1900: Microsoft Visual Studio 2015 / 14.0
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57 #ifdef _MSC_VER
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58 #define LLVM_MSC_PREREQ(version) (_MSC_VER >= (version))
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59
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60 // We require at least MSVC 2013.
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61 #if !LLVM_MSC_PREREQ(1800)
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62 #error LLVM requires at least MSVC 2013.
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63 #endif
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64
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65 #else
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66 #define LLVM_MSC_PREREQ(version) 0
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67 #endif
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68
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69 #if !defined(_MSC_VER) || defined(__clang__) || LLVM_MSC_PREREQ(1900)
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70 #define LLVM_NOEXCEPT noexcept
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71 #else
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72 #define LLVM_NOEXCEPT
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73 #endif
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74
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75 /// \brief Does the compiler support r-value reference *this?
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76 ///
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77 /// Sadly, this is separate from just r-value reference support because GCC
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78 /// implemented this later than everything else.
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79 #if __has_feature(cxx_rvalue_references) || LLVM_GNUC_PREREQ(4, 8, 1)
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80 #define LLVM_HAS_RVALUE_REFERENCE_THIS 1
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81 #else
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82 #define LLVM_HAS_RVALUE_REFERENCE_THIS 0
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83 #endif
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84
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85 /// Expands to '&' if r-value references are supported.
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86 ///
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87 /// This can be used to provide l-value/r-value overrides of member functions.
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88 /// The r-value override should be guarded by LLVM_HAS_RVALUE_REFERENCE_THIS
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89 #if LLVM_HAS_RVALUE_REFERENCE_THIS
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90 #define LLVM_LVALUE_FUNCTION &
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91 #else
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92 #define LLVM_LVALUE_FUNCTION
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93 #endif
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94
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95 #if __has_feature(cxx_constexpr) || defined(__GXX_EXPERIMENTAL_CXX0X__)
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96 # define LLVM_CONSTEXPR constexpr
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97 #else
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98 # define LLVM_CONSTEXPR
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99 #endif
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100
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101 /// LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked
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102 /// into a shared library, then the class should be private to the library and
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103 /// not accessible from outside it. Can also be used to mark variables and
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104 /// functions, making them private to any shared library they are linked into.
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105 /// On PE/COFF targets, library visibility is the default, so this isn't needed.
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106 #if (__has_attribute(visibility) || LLVM_GNUC_PREREQ(4, 0, 0)) && \
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107 !defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(LLVM_ON_WIN32)
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108 #define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden")))
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109 #else
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110 #define LLVM_LIBRARY_VISIBILITY
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111 #endif
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112
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113 #if __has_attribute(sentinel) || LLVM_GNUC_PREREQ(3, 0, 0)
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114 #define LLVM_END_WITH_NULL __attribute__((sentinel))
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115 #else
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116 #define LLVM_END_WITH_NULL
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117 #endif
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118
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119 #if __has_attribute(used) || LLVM_GNUC_PREREQ(3, 1, 0)
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120 #define LLVM_ATTRIBUTE_USED __attribute__((__used__))
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121 #else
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122 #define LLVM_ATTRIBUTE_USED
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123 #endif
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124
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125 #if __has_attribute(warn_unused_result) || LLVM_GNUC_PREREQ(3, 4, 0)
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126 #define LLVM_ATTRIBUTE_UNUSED_RESULT __attribute__((__warn_unused_result__))
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127 #else
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128 #define LLVM_ATTRIBUTE_UNUSED_RESULT
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129 #endif
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130
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131 // Some compilers warn about unused functions. When a function is sometimes
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132 // used or not depending on build settings (e.g. a function only called from
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133 // within "assert"), this attribute can be used to suppress such warnings.
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134 //
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135 // However, it shouldn't be used for unused *variables*, as those have a much
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diff changeset
136 // more portable solution:
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diff changeset
137 // (void)unused_var_name;
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138 // Prefer cast-to-void wherever it is sufficient.
83
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139 #if __has_attribute(unused) || LLVM_GNUC_PREREQ(3, 1, 0)
0
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140 #define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__))
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diff changeset
141 #else
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142 #define LLVM_ATTRIBUTE_UNUSED
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143 #endif
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144
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145 // FIXME: Provide this for PE/COFF targets.
83
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146 #if (__has_attribute(weak) || LLVM_GNUC_PREREQ(4, 0, 0)) && \
0
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diff changeset
147 (!defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(LLVM_ON_WIN32))
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148 #define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__))
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diff changeset
149 #else
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150 #define LLVM_ATTRIBUTE_WEAK
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151 #endif
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152
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153 // Prior to clang 3.2, clang did not accept any spelling of
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154 // __has_attribute(const), so assume it is supported.
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155 #if defined(__clang__) || defined(__GNUC__)
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156 // aka 'CONST' but following LLVM Conventions.
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157 #define LLVM_READNONE __attribute__((__const__))
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158 #else
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159 #define LLVM_READNONE
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160 #endif
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161
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162 #if __has_attribute(pure) || defined(__GNUC__)
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parents:
diff changeset
163 // aka 'PURE' but following LLVM Conventions.
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diff changeset
164 #define LLVM_READONLY __attribute__((__pure__))
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165 #else
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166 #define LLVM_READONLY
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167 #endif
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diff changeset
168
83
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169 #if __has_builtin(__builtin_expect) || LLVM_GNUC_PREREQ(4, 0, 0)
0
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170 #define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
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diff changeset
171 #define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
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diff changeset
172 #else
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diff changeset
173 #define LLVM_LIKELY(EXPR) (EXPR)
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174 #define LLVM_UNLIKELY(EXPR) (EXPR)
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diff changeset
175 #endif
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diff changeset
176
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diff changeset
177 // C++ doesn't support 'extern template' of template specializations. GCC does,
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parents:
diff changeset
178 // but requires __extension__ before it. In the header, use this:
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diff changeset
179 // EXTERN_TEMPLATE_INSTANTIATION(class foo<bar>);
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diff changeset
180 // in the .cpp file, use this:
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diff changeset
181 // TEMPLATE_INSTANTIATION(class foo<bar>);
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diff changeset
182 #ifdef __GNUC__
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diff changeset
183 #define EXTERN_TEMPLATE_INSTANTIATION(X) __extension__ extern template X
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diff changeset
184 #define TEMPLATE_INSTANTIATION(X) template X
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diff changeset
185 #else
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diff changeset
186 #define EXTERN_TEMPLATE_INSTANTIATION(X)
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diff changeset
187 #define TEMPLATE_INSTANTIATION(X)
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diff changeset
188 #endif
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diff changeset
189
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diff changeset
190 /// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so,
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diff changeset
191 /// mark a method "not for inlining".
83
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192 #if __has_attribute(noinline) || LLVM_GNUC_PREREQ(3, 4, 0)
0
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diff changeset
193 #define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline))
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diff changeset
194 #elif defined(_MSC_VER)
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diff changeset
195 #define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline)
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diff changeset
196 #else
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diff changeset
197 #define LLVM_ATTRIBUTE_NOINLINE
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diff changeset
198 #endif
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diff changeset
199
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diff changeset
200 /// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do
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diff changeset
201 /// so, mark a method "always inline" because it is performance sensitive. GCC
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diff changeset
202 /// 3.4 supported this but is buggy in various cases and produces unimplemented
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diff changeset
203 /// errors, just use it in GCC 4.0 and later.
83
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204 #if __has_attribute(always_inline) || LLVM_GNUC_PREREQ(4, 0, 0)
0
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diff changeset
205 #define LLVM_ATTRIBUTE_ALWAYS_INLINE inline __attribute__((always_inline))
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diff changeset
206 #elif defined(_MSC_VER)
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diff changeset
207 #define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline
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diff changeset
208 #else
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diff changeset
209 #define LLVM_ATTRIBUTE_ALWAYS_INLINE
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210 #endif
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diff changeset
211
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parents:
diff changeset
212 #ifdef __GNUC__
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diff changeset
213 #define LLVM_ATTRIBUTE_NORETURN __attribute__((noreturn))
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diff changeset
214 #elif defined(_MSC_VER)
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diff changeset
215 #define LLVM_ATTRIBUTE_NORETURN __declspec(noreturn)
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diff changeset
216 #else
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diff changeset
217 #define LLVM_ATTRIBUTE_NORETURN
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diff changeset
218 #endif
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diff changeset
219
83
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diff changeset
220 #if __has_attribute(returns_nonnull) || LLVM_GNUC_PREREQ(4, 9, 0)
77
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diff changeset
221 #define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull))
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diff changeset
222 #else
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diff changeset
223 #define LLVM_ATTRIBUTE_RETURNS_NONNULL
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diff changeset
224 #endif
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diff changeset
225
0
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diff changeset
226 /// LLVM_EXTENSION - Support compilers where we have a keyword to suppress
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parents:
diff changeset
227 /// pedantic diagnostics.
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parents:
diff changeset
228 #ifdef __GNUC__
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229 #define LLVM_EXTENSION __extension__
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diff changeset
230 #else
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parents:
diff changeset
231 #define LLVM_EXTENSION
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diff changeset
232 #endif
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parents:
diff changeset
233
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parents:
diff changeset
234 // LLVM_ATTRIBUTE_DEPRECATED(decl, "message")
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parents:
diff changeset
235 #if __has_feature(attribute_deprecated_with_message)
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parents:
diff changeset
236 # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
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parents:
diff changeset
237 decl __attribute__((deprecated(message)))
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parents:
diff changeset
238 #elif defined(__GNUC__)
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parents:
diff changeset
239 # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
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parents:
diff changeset
240 decl __attribute__((deprecated))
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parents:
diff changeset
241 #elif defined(_MSC_VER)
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parents:
diff changeset
242 # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
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parents:
diff changeset
243 __declspec(deprecated(message)) decl
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parents:
diff changeset
244 #else
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parents:
diff changeset
245 # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
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parents:
diff changeset
246 decl
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parents:
diff changeset
247 #endif
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parents:
diff changeset
248
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parents:
diff changeset
249 /// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands
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parents:
diff changeset
250 /// to an expression which states that it is undefined behavior for the
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parents:
diff changeset
251 /// compiler to reach this point. Otherwise is not defined.
83
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diff changeset
252 #if __has_builtin(__builtin_unreachable) || LLVM_GNUC_PREREQ(4, 5, 0)
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
253 # define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
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parents:
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254 #elif defined(_MSC_VER)
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255 # define LLVM_BUILTIN_UNREACHABLE __assume(false)
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256 #endif
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257
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258 /// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression
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259 /// which causes the program to exit abnormally.
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260 #if __has_builtin(__builtin_trap) || LLVM_GNUC_PREREQ(4, 3, 0)
0
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261 # define LLVM_BUILTIN_TRAP __builtin_trap()
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262 #elif defined(_MSC_VER)
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263 // The __debugbreak intrinsic is supported by MSVC, does not require forward
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264 // declarations involving platform-specific typedefs (unlike RaiseException),
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265 // results in a call to vectored exception handlers, and encodes to a short
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266 // instruction that still causes the trapping behavior we want.
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267 # define LLVM_BUILTIN_TRAP __debugbreak()
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268 #else
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269 # define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0
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270 #endif
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271
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272 /// \macro LLVM_ASSUME_ALIGNED
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273 /// \brief Returns a pointer with an assumed alignment.
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274 #if __has_builtin(__builtin_assume_aligned) || LLVM_GNUC_PREREQ(4, 7, 0)
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275 # define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a)
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276 #elif defined(LLVM_BUILTIN_UNREACHABLE)
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277 // As of today, clang does not support __builtin_assume_aligned.
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278 # define LLVM_ASSUME_ALIGNED(p, a) \
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279 (((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p)))
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280 #else
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281 # define LLVM_ASSUME_ALIGNED(p, a) (p)
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282 #endif
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283
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284 /// \macro LLVM_FUNCTION_NAME
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285 /// \brief Expands to __func__ on compilers which support it. Otherwise,
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286 /// expands to a compiler-dependent replacement.
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287 #if defined(_MSC_VER)
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288 # define LLVM_FUNCTION_NAME __FUNCTION__
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289 #else
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290 # define LLVM_FUNCTION_NAME __func__
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291 #endif
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292
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293 /// \macro LLVM_MEMORY_SANITIZER_BUILD
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294 /// \brief Whether LLVM itself is built with MemorySanitizer instrumentation.
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295 #if __has_feature(memory_sanitizer)
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296 # define LLVM_MEMORY_SANITIZER_BUILD 1
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297 # include <sanitizer/msan_interface.h>
0
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298 #else
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299 # define LLVM_MEMORY_SANITIZER_BUILD 0
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300 # define __msan_allocated_memory(p, size)
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301 # define __msan_unpoison(p, size)
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302 #endif
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303
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304 /// \macro LLVM_ADDRESS_SANITIZER_BUILD
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305 /// \brief Whether LLVM itself is built with AddressSanitizer instrumentation.
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306 #if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
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307 # define LLVM_ADDRESS_SANITIZER_BUILD 1
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308 #else
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309 # define LLVM_ADDRESS_SANITIZER_BUILD 0
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310 #endif
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311
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312 /// \macro LLVM_IS_UNALIGNED_ACCESS_FAST
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313 /// \brief Is unaligned memory access fast on the host machine.
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314 ///
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315 /// Don't specialize on alignment for platforms where unaligned memory accesses
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316 /// generates the same code as aligned memory accesses for common types.
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317 #if defined(_M_AMD64) || defined(_M_IX86) || defined(__amd64) || \
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318 defined(__amd64__) || defined(__x86_64) || defined(__x86_64__) || \
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319 defined(_X86_) || defined(__i386) || defined(__i386__)
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320 # define LLVM_IS_UNALIGNED_ACCESS_FAST 1
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321 #else
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322 # define LLVM_IS_UNALIGNED_ACCESS_FAST 0
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323 #endif
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324
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325 /// \brief Mark debug helper function definitions like dump() that should not be
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326 /// stripped from debug builds.
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327 // FIXME: Move this to a private config.h as it's not usable in public headers.
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328 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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329 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED
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330 #else
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331 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE
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332 #endif
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333
83
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334 /// \macro LLVM_THREAD_LOCAL
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335 /// \brief A thread-local storage specifier which can be used with globals,
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336 /// extern globals, and static globals.
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337 ///
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338 /// This is essentially an extremely restricted analog to C++11's thread_local
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339 /// support, and uses that when available. However, it falls back on
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340 /// platform-specific or vendor-provided extensions when necessary. These
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341 /// extensions don't support many of the C++11 thread_local's features. You
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342 /// should only use this for PODs that you can statically initialize to
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343 /// some constant value. In almost all circumstances this is most appropriate
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344 /// for use with a pointer, integer, or small aggregation of pointers and
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345 /// integers.
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346 #if LLVM_ENABLE_THREADS
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347 #if __has_feature(cxx_thread_local)
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348 #define LLVM_THREAD_LOCAL thread_local
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349 #elif defined(_MSC_VER)
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350 // MSVC supports this with a __declspec.
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351 #define LLVM_THREAD_LOCAL __declspec(thread)
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352 #else
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353 // Clang, GCC, and other compatible compilers used __thread prior to C++11 and
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354 // we only need the restricted functionality that provides.
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355 #define LLVM_THREAD_LOCAL __thread
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356 #endif
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357 #else // !LLVM_ENABLE_THREADS
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358 // If threading is disabled entirely, this compiles to nothing and you get
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359 // a normal global variable.
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360 #define LLVM_THREAD_LOCAL
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361 #endif
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362
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363 #endif