src/gromacs/utility/basedefinitions.h

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  37 /*! \file
  38  * \brief
  39  * Basic types and macros used throughout \Gromacs.
  40  *
  41  * \inpublicapi
  42  * \ingroup module_utility
  43  */
  44 #ifndef GMX_UTILITY_BASEDEFINITIONS_H
  45 #define GMX_UTILITY_BASEDEFINITIONS_H
  46
  47 #include <stdint.h>
  48 #ifndef _MSC_VER
  49 #include <inttypes.h>
  50 #endif
  51
  52 /*! \brief
  53  * Boolean type for use in \Gromacs C code.
  54  *
  55  * There is no standard size for 'bool' in C++, so when
  56  * we previously defined it to int for C code the data types
  57  * (and structs) would have different size depending on your compiler,
  58  * both at \Gromacs build time and when you use the library.
  59  * The only way around this is to NOT assume anything about the C++ type,
  60  * so we cannot use the name 'bool' in our C code anymore.
  61  */
  62 typedef int gmx_bool;
  63
  64 #ifndef FALSE
  65 /** False value for ::gmx_bool. */
  66 #  define FALSE   0
  67 #endif
  68 #ifndef TRUE
  69 /** True value for ::gmx_bool. */
  70 #  define TRUE    1
  71 #endif
  72 /** Number of gmx_bool values. */
  73 #define BOOL_NR 2
  74
  75 /*! \name Fixed-width integer types
  76  *
  77  * These types and macros provide the equivalent of 32- and 64-bit integer
  78  * types from C99 headers `stdint.h` and `inttypes.h`.  These headers are also
  79  * there in C++11.  The types and macros from here should be used instead of
  80  * `int32_t` etc.
  81  * MSVC doesn't support these before Visual Studio 2013.
  82  */
  83 /*! \{ */
  84 #ifdef _MSC_VER
  85 typedef __int32 gmx_int32_t;
  86 #define GMX_PRId32 "I32d"
  87 #define GMX_SCNd32 "I32d"
  88
  89 typedef __int64 gmx_int64_t;
  90 #define GMX_PRId64 "I64d"
  91 #define GMX_SCNd64 "I64d"
  92
  93 typedef unsigned __int32 gmx_uint32_t;
  94 #define GMX_PRIu32 "I32u"
  95 #define GMX_SCNu32 "I32u"
  96
  97 typedef unsigned __int64 gmx_uint64_t;
  98 #define GMX_PRIu64 "I64u"
  99 #define GMX_SCNu64 "I64u"
 100 #else
 101 typedef int32_t gmx_int32_t;
 102 #define GMX_PRId32 PRId32
 103 #define GMX_SCNd32 SCNd32
 104
 105 typedef int64_t gmx_int64_t;
 106 #define GMX_PRId64 PRId64
 107 #define GMX_SCNd64 SCNd64
 108
 109 typedef uint32_t gmx_uint32_t;
 110 #define GMX_PRIu32 PRIu32
 111 #define GMX_SCNu32 SCNu32
 112
 113 typedef uint64_t gmx_uint64_t;
 114 #define GMX_PRIu64 PRIu64
 115 #define GMX_SCNu64 SCNu64
 116 #endif
 117
 118 #define GMX_INT32_MAX INT32_MAX
 119 #define GMX_INT32_MIN INT32_MIN
 120
 121 #define GMX_INT64_MAX INT64_MAX
 122 #define GMX_INT64_MIN INT64_MIN
 123
 124 #define GMX_UINT32_MAX UINT32_MAX
 125 #define GMX_UINT32_MIN UINT32_MIN
 126
 127 #define GMX_UINT64_MAX UINT64_MAX
 128 #define GMX_UINT64_MIN UINT64_MIN
 129 /*! \} */
 130
 131 /*! \def gmx_inline
 132  * \brief
 133  * Keyword to use in C code instead of C99 `inline`.
 134  *
 135  * Some of the C compilers we support do not recognize the C99 keyword
 136  * `inline`.  This macro should be used in C code and in shared C/C++ headers
 137  * to indicate a function is inlined.
 138  * C++ code should use plain `inline`, as that is already in C++98.
 139  */
 140 #if !defined __cplusplus && _MSC_VER
 141 #define gmx_inline __inline
 142 #else
 143 /* C++ or C99 */
 144 #define gmx_inline inline
 145 #endif
 146
 147 /* ICC, GCC, MSVC, Pathscale, PGI, XLC support __restrict.
 148  * Any other compiler can be added here. */
 149 /*! \brief
 150  * Keyword to use in instead of C99 `restrict`.
 151  *
 152  * We cannot use `restrict` because it is only in C99, but not in C++.
 153  * This macro should instead be used to allow easily supporting different
 154  * compilers.
 155  */
 156 #define gmx_restrict __restrict
 157
 158 /*! \def gmx_cxx_const
 159  * \brief
 160  * Keyword to work around C/C++ differences in possible const keyword usage.
 161  *
 162  * Some functions that do not modify their input parameters cannot declare
 163  * those parameters as `const` and compile warning/error-free on both C and C++
 164  * compilers because of differences in `const` semantics.  This macro can be
 165  * used in cases where C++ allows `const`, but C does not like it, to make the
 166  * same declaration work for both.
 167  */
 168 #ifdef __cplusplus
 169 #define gmx_cxx_const const
 170 #else
 171 #define gmx_cxx_const
 172 #endif
 173
 174 /*! \def gmx_unused
 175  * \brief
 176  * Attribute to suppress compiler warnings about unused function parameters.
 177  *
 178  * This attribute suppresses compiler warnings about unused function arguments
 179  * by marking them as possibly unused.  Some arguments are unused but
 180  * have to be retained to preserve a function signature
 181  * that must match that of another function.
 182  * Some arguments are only used in *some* conditional compilation code paths
 183  * (e.g. MPI).
 184  */
 185 #ifndef gmx_unused
 186 #ifdef __GNUC__
 187 /* GCC, clang, and some ICC pretending to be GCC */
 188 #  define gmx_unused __attribute__ ((unused))
 189 #elif (defined(__INTEL_COMPILER) || defined(__ECC)) && !defined(_MSC_VER)
 190 /* ICC on *nix */
 191 #  define gmx_unused __attribute__ ((unused))
 192 #elif defined(__PGI)
 193 /* Portland group compilers */
 194 #  define gmx_unused __attribute__ ((unused))
 195 #elif defined _MSC_VER
 196 /* MSVC */
 197 #  define gmx_unused /*@unused@*/
 198 #elif defined(__xlC__)
 199 /* IBM */
 200 #  define gmx_unused __attribute__ ((unused))
 201 #else
 202 #  define gmx_unused
 203 #endif
 204 #endif
 205
 206 #ifndef __has_feature
 207 /** For compatibility with non-clang compilers. */
 208 #define __has_feature(x) 0
 209 #endif
 210
 211 /*! \def gmx_noreturn
 212  * \brief
 213  * Indicate that a function is not expected to return.
 214  */
 215 #ifndef gmx_noreturn
 216 #if defined(__GNUC__) || __has_feature(attribute_analyzer_noreturn)
 217 #define gmx_noreturn __attribute__((noreturn))
 218 #elif defined (_MSC_VER)
 219 #define gmx_noreturn __declspec(noreturn)
 220 #else
 221 #define gmx_noreturn
 222 #endif
 223 #endif
 224
 225 /*! \def GMX_ALIGNMENT
 226  * \brief
 227  * Supports aligned variables */
 228
 229 /*! \def GMX_ALIGNED(type, alignment)
 230  * \brief
 231  * Declare variable with data alignment
 232  *
 233  * \param[in] type       Type of variable
 234  * \param[in] alignment  Alignment in multiples of type
 235  *
 236  * Typical usage:
 237  * \code
 238    GMX_ALIGNED(real, GMX_SIMD_REAL_WIDTH) buf[...];
 239    \endcode
 240  */
 241 /* alignas(x) is not used even with GMX-CXX11 because it isn't in the list of
 242    tested features and thus might not be supported.
 243    MSVC2010 has align but doesn't support sizeof inside. */
 244 #if defined(_MSC_VER) && (_MSC_VER >= 1700 || defined(__ICL))
 245 #  define GMX_ALIGNMENT 1
 246 #  define GMX_ALIGNED(type, alignment) __declspec(align(alignment*sizeof(type))) type
 247 #elif defined(__GNUC__) || defined(__clang__)
 248 #  define GMX_ALIGNMENT 1
 249 #  define GMX_ALIGNED(type, alignment) __attribute__ ((__aligned__(alignment*sizeof(type)))) type
 250 #else
 251 #  define GMX_ALIGNMENT 0
 252 #  define GMX_ALIGNED(type, alignment)
 253 #endif
 254
 255 /*! \brief
 256  * Macro to explicitly ignore an unused value.
 257  *
 258  * \ingroup module_utility
 259  */
 260 #define GMX_UNUSED_VALUE(value) (void)value
 261
 262 #ifdef __cplusplus
 263 namespace gmx
 264 {
 265 namespace internal
 266 {
 267 /*! \cond internal */
 268 /*! \internal \brief
 269  * Helper for ignoring values in macros.
 270  *
 271  * \ingroup module_utility
 272  */
 273 template <typename T>
 274 static inline void ignoreValueHelper(const T &)
 275 {
 276 }
 277 //! \endcond
 278 }   // namespace internal
 279 }   // namespace gmx
 280
 281 /*! \brief
 282  * Macro to explicitly ignore a return value of a call.
 283  *
 284  * Mainly meant for ignoring values of functions declared with
 285  * `__attribute__((warn_unused_return))`.  Makes it easy to find those places if
 286  * they need to be fixed, and document the intent in cases where the return
 287  * value really can be ignored.  It also makes it easy to adapt the approach so
 288  * that they don't produce warnings.  A cast to void doesn't remove the warning
 289  * in gcc, while adding a dummy variable can cause warnings about an unused
 290  * variable.
 291  *
 292  * \ingroup module_utility
 293  */
 294 #define GMX_IGNORE_RETURN_VALUE(call) \
 295         ::gmx::internal::ignoreValueHelper(call)
 296 #endif
 297
 298 #endif