src/stdafx.h

   1 /*
   2  * This file is part of OpenTTD.
   3  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   4  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   5  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   6  */
   7
   8 /** @file stdafx.h Definition of base types and functions in a cross-platform compatible way. */
   9
  10 #ifndef STDAFX_H
  11 #define STDAFX_H
  12
  13 #if defined(_WIN32)
  14         /* MinGW defaults to Windows 7 if none of these are set, and they must be set before any MinGW header is included */
  15 #       define NTDDI_VERSION NTDDI_WINXP // Windows XP
  16 #       define _WIN32_WINNT 0x501        // Windows XP
  17 #       define _WIN32_WINDOWS 0x501      // Windows XP
  18 #       define WINVER 0x0501             // Windows XP
  19 #       define _WIN32_IE_ 0x0600         // 6.0 (XP+)
  20 #endif
  21
  22 #ifdef _MSC_VER
  23         /* Stop Microsoft (and clang-cl) compilers from complaining about potentially-unsafe/potentially-non-standard functions */
  24 #       define _CRT_SECURE_NO_DEPRECATE
  25 #       define _CRT_SECURE_NO_WARNINGS
  26 #       define _CRT_NONSTDC_NO_WARNINGS
  27 #endif
  28
  29 #if defined(__APPLE__)
  30 #       include "os/macosx/osx_stdafx.h"
  31 #else
  32 /* It seems that we need to include stdint.h before anything else
  33  * We need INT64_MAX, which for most systems comes from stdint.h.
  34  * For OSX the inclusion is already done in osx_stdafx.h. */
  35 #       define __STDC_LIMIT_MACROS
  36 #       include <stdint.h>
  37 #endif /* __APPLE__ */
  38
  39 #if defined(__HAIKU__)
  40 #       include <SupportDefs.h>
  41 #       include <unistd.h>
  42 #       define _DEFAULT_SOURCE
  43 #       define _GNU_SOURCE
  44 #endif
  45
  46 #include <algorithm>
  47 #include <array>
  48 #include <bit>
  49 #include <cassert>
  50 #include <cctype>
  51 #include <cerrno>
  52 #include <climits>
  53 #include <cmath>
  54 #include <cstddef>
  55 #include <cstdint>
  56 #include <cstdio>
  57 #include <cstring>
  58 #include <cstdlib>
  59 #include <cwchar>
  60 #include <deque>
  61 #include <exception>
  62 #include <functional>
  63 #include <iterator>
  64 #include <list>
  65 #include <limits>
  66 #include <map>
  67 #include <memory>
  68 #include <numeric>
  69 #include <optional>
  70 #include <set>
  71 #include <source_location>
  72 #include <span>
  73 #include <stdexcept>
  74 #include <string>
  75 #include <type_traits>
  76 #include <variant>
  77 #include <vector>
  78
  79 #if defined(UNIX) || defined(__MINGW32__)
  80 #       include <sys/types.h>
  81 #endif
  82
  83 /* Stuff for GCC */
  84 #if defined(__GNUC__) || (defined(__clang__) && !defined(_MSC_VER))
  85 #       define CDECL
  86 #endif /* __GNUC__ || __clang__ */
  87
  88 #if __GNUC__ > 11 || (__GNUC__ == 11 && __GNUC_MINOR__ >= 1)
  89 #      define NOACCESS(args) __attribute__ ((access (none, args)))
  90 #else
  91 #      define NOACCESS(args)
  92 #endif
  93
  94 #if defined(_WIN32)
  95 #       define WIN32_LEAN_AND_MEAN     // Exclude rarely-used stuff from Windows headers
  96 #endif
  97
  98 #if defined(_MSC_VER)
  99         // See https://learn.microsoft.com/en-us/cpp/cpp/empty-bases?view=msvc-170
 100 #       define EMPTY_BASES __declspec(empty_bases)
 101 #else
 102 #       define EMPTY_BASES
 103 #endif
 104
 105 /* Stuff for MSVC */
 106 #if defined(_MSC_VER)
 107 #       pragma once
 108 #       define NOMINMAX                // Disable min/max macros in windows.h.
 109
 110 #       pragma warning(disable: 4244)  // 'conversion' conversion from 'type1' to 'type2', possible loss of data
 111 #       pragma warning(disable: 4761)  // integral size mismatch in argument : conversion supplied
 112 #       pragma warning(disable: 4200)  // nonstandard extension used : zero-sized array in struct/union
 113 #       pragma warning(disable: 4355)  // 'this' : used in base member initializer list
 114
 115 #       pragma warning(disable: 4291)   // no matching operator delete found; memory will not be freed if initialization throws an exception (reason: our overloaded functions never throw an exception)
 116 #       pragma warning(disable: 4996)   // 'function': was declared deprecated
 117 #       pragma warning(disable: 6308)   // code analyzer: 'realloc' might return null pointer: assigning null pointer to 't_ptr', which is passed as an argument to 'realloc', will cause the original memory block to be leaked
 118 #       pragma warning(disable: 6011)   // code analyzer: Dereferencing NULL pointer 'pfGetAddrInfo': Lines: 995, 996, 998, 999, 1001
 119 #       pragma warning(disable: 6326)   // code analyzer: potential comparison of a constant with another constant
 120 #       pragma warning(disable: 6031)   // code analyzer: Return value ignored: 'ReadFile'
 121 #       pragma warning(disable: 6246)   // code analyzer: Local declaration of 'statspec' hides declaration of the same name in outer scope. For additional information, see previous declaration at ...
 122
 123 #       define CDECL _cdecl
 124
 125 #       if defined(_WIN32) && !defined(_WIN64)
 126 #               if !defined(_W64)
 127 #                       define _W64
 128 #               endif
 129
 130                 typedef _W64 int INT_PTR, *PINT_PTR;
 131                 typedef _W64 unsigned int UINT_PTR, *PUINT_PTR;
 132 #       endif /* _WIN32 && !_WIN64 */
 133
 134 #       if defined(_WIN64)
 135 #               define fseek _fseeki64
 136 #       endif /* _WIN64 */
 137
 138         /* zlib from vcpkg use cdecl calling convention without enforcing it in the headers */
 139 #       if defined(WITH_ZLIB)
 140 #               if !defined(ZEXPORT)
 141 #                       define ZEXPORT CDECL
 142 #               endif
 143 #       endif
 144
 145         /* freetype from vcpkg use cdecl calling convention without enforcing it in the headers */
 146 #       if defined(WITH_FREETYPE)
 147 #               if !defined(FT_EXPORT)
 148 #                       define FT_EXPORT( x )  extern "C"  x CDECL
 149 #               endif
 150 #       endif
 151
 152         /* liblzma from vcpkg (before 5.2.4-2) used to patch lzma.h to define LZMA_API_STATIC for static builds */
 153 #       if defined(WITH_LIBLZMA)
 154 #               if !defined(LZMA_API_STATIC)
 155 #                       define LZMA_API_STATIC
 156 #               endif
 157 #       endif
 158
 159         /* MSVC doesn't have these :( */
 160 #       define S_ISDIR(mode) (mode & S_IFDIR)
 161 #       define S_ISREG(mode) (mode & S_IFREG)
 162
 163 #endif /* defined(_MSC_VER) */
 164
 165 #if !defined(STRGEN) && !defined(SETTINGSGEN)
 166 #       if defined(_WIN32)
 167                 char *getcwd(char *buf, size_t size);
 168
 169                 std::string FS2OTTD(const std::wstring &name);
 170                 std::wstring OTTD2FS(const std::string &name);
 171 #       elif defined(WITH_ICONV)
 172                 std::string FS2OTTD(const std::string &name);
 173                 std::string OTTD2FS(const std::string &name);
 174 #       else
 175                 template <typename T> std::string FS2OTTD(T name) { return name; }
 176                 template <typename T> std::string OTTD2FS(T name) { return name; }
 177 #       endif /* _WIN32 or WITH_ICONV */
 178 #endif /* STRGEN || SETTINGSGEN */
 179
 180 #if defined(_WIN32)
 181 #       define PATHSEP "\\"
 182 #       define PATHSEPCHAR '\\'
 183 #else
 184 #       define PATHSEP "/"
 185 #       define PATHSEPCHAR '/'
 186 #endif
 187
 188 #if defined(_MSC_VER)
 189 #       define PACK_N(type_dec, n) __pragma(pack(push, n)) type_dec; __pragma(pack(pop))
 190 #elif defined(__MINGW32__)
 191 #       define PRAGMA(x) _Pragma(#x)
 192 #       define PACK_N(type_dec, n) PRAGMA(pack(push, n)) type_dec; PRAGMA(pack(pop))
 193 #else
 194 #       define PACK_N(type_dec, n) type_dec __attribute__((__packed__, aligned(n)))
 195 #endif
 196 #define PACK(type_dec) PACK_N(type_dec, 1)
 197
 198 /*
 199  * When making a (pure) debug build, the compiler will by default disable
 200  * inlining of functions. This has a detremental effect on the performance of
 201  * debug builds, especially when more and more trivial (wrapper) functions get
 202  * added to the code base.
 203  * Take for example the savegame called "Wentbourne", when running this game
 204  * for 100 ticks with the null video driver a number of fairly trivial
 205  * functions show up on top. The most common one is the implicit conversion
 206  * operator of TileIndex to unsigned int, which takes up over 5% of the total
 207  * run time and functionally does absolutely nothing. The remaining functions
 208  * for the top 5 are GB, GetTileType, Map::Size and IsTileType to a total of
 209  * about 12.5% of the game's total run time.
 210  * It is possible to still force inlining in the most commonly used compilers,
 211  * but that is at the cost of some problems with debugging due to the forced
 212  * inlining. However, the performance benefit can be enormous; when forcing
 213  * inlining for the previously mentioned top 5, the debug build ran about 15%
 214  * quicker.
 215  * The following debug_inline annotation may be added to functions comply
 216  * with the following preconditions:
 217  *  1: the function takes more than 0.5% of a profiled debug runtime
 218  *  2: the function does not modify the game state
 219  *  3: the function does not contain selection or iteration statements,
 220  *     i.e. no if, switch, for, do, while, etcetera.
 221  *  4: the function is one line of code, excluding assertions.
 222  *  5: the function is defined in a header file.
 223  * The debug_inline annotation must be placed in front of the function, i.e.
 224  * before the optional static or constexpr modifier.
 225  */
 226 #if !defined(_DEBUG) || defined(NO_DEBUG_INLINE)
 227 /*
 228  * Do not force inlining when not in debug. This way we do not work against
 229  * any carefully designed compiler optimizations.
 230  */
 231 #define debug_inline inline
 232 #elif defined(__clang__) || defined(__GNUC__)
 233 #define debug_inline [[gnu::always_inline]] inline
 234 #else
 235 /*
 236  * MSVC explicitly disables inlining, even forced inlining, in debug builds
 237  * so __forceinline makes no difference compared to inline. Other unknown
 238  * compilers can also just fallback to a normal inline.
 239  */
 240 #define debug_inline inline
 241 #endif
 242
 243 /* This is already defined in unix, but not in QNX Neutrino (6.x) or Cygwin. */
 244 #if (!defined(UNIX) && !defined(__HAIKU__)) || defined(__QNXNTO__) || defined(__CYGWIN__)
 245         typedef unsigned int uint;
 246 #endif
 247
 248 #if !defined(WITH_PERSONAL_DIR)
 249 #       define PERSONAL_DIR ""
 250 #endif
 251
 252 /* Define the the platforms that use XDG */
 253 #if defined(WITH_PERSONAL_DIR) && defined(UNIX) && !defined(__APPLE__) && !defined(__EMSCRIPTEN__)
 254 #       define USE_XDG
 255 #endif
 256
 257 /* Check if the types have the bitsizes like we are using them */
 258 static_assert(sizeof(uint64_t) == 8);
 259 static_assert(sizeof(uint32_t) == 4);
 260 static_assert(sizeof(uint16_t) == 2);
 261 static_assert(sizeof(uint8_t)  == 1);
 262 static_assert(SIZE_MAX >= UINT32_MAX);
 263
 264 #ifndef M_PI_2
 265 #define M_PI_2 1.57079632679489661923
 266 #define M_PI   3.14159265358979323846
 267 #endif /* M_PI_2 */
 268
 269 template <typename T, size_t N>
 270 char (&ArraySizeHelper(T (&array)[N]))[N];
 271
 272 /**
 273  * Return the length of an fixed size array.
 274  * Unlike sizeof this function returns the number of elements
 275  * of the given type.
 276  *
 277  * @param x The pointer to the first element of the array
 278  * @return The number of elements
 279  */
 280 #define lengthof(array) (sizeof(ArraySizeHelper(array)))
 281
 282 /**
 283  * Gets the size of a variable within a class.
 284  * @param base     The class the variable is in.
 285  * @param variable The variable to get the size of.
 286  * @return the size of the variable
 287  */
 288 #define cpp_sizeof(base, variable) (sizeof(std::declval<base>().variable))
 289
 290
 291 /* take care of some name clashes on MacOS */
 292 #if defined(__APPLE__)
 293 #       define GetString OTTD_GetString
 294 #       define DrawString OTTD_DrawString
 295 #       define CloseConnection OTTD_CloseConnection
 296 #endif /* __APPLE__ */
 297
 298 #if defined(__GNUC__) || defined(__clang__)
 299 #       define GNU_TARGET(x) [[gnu::target(x)]]
 300 #else
 301 #       define GNU_TARGET(x)
 302 #endif /* __GNUC__ || __clang__ */
 303
 304 /* For the FMT library we only want to use the headers, not link to some library. */
 305 #define FMT_HEADER_ONLY
 306
 307 [[noreturn]] void NOT_REACHED(const std::source_location location = std::source_location::current());
 308 [[noreturn]] void AssertFailedError(const char *expression, const std::source_location location = std::source_location::current());
 309
 310 /* For non-debug builds with assertions enabled use the special assertion handler. */
 311 #if defined(NDEBUG) && defined(WITH_ASSERT)
 312 #       undef assert
 313 #       define assert(expression) do { if (!(expression)) [[unlikely]] AssertFailedError(#expression); } while (false)
 314 #endif
 315
 316 /* Define JSON_ASSERT, which is used by nlohmann-json. Otherwise the header-file
 317  * will re-include assert.h, and reset the assert macro. */
 318 #define JSON_ASSERT(x) assert(x)
 319
 320 #if defined(MAX_PATH)
 321         /* It's already defined, no need to override */
 322 #elif defined(PATH_MAX) && PATH_MAX > 0
 323         /* Use the value from PATH_MAX, if it exists */
 324 #       define MAX_PATH PATH_MAX
 325 #else
 326         /* If all else fails, hardcode something :( */
 327 #       define MAX_PATH 260
 328 #endif
 329
 330 /**
 331  * Version of the standard free that accepts const pointers.
 332  * @param ptr The data to free.
 333  */
 334 inline void free(const void *ptr)
 335 {
 336         free(const_cast<void *>(ptr));
 337 }
 338
 339 /**
 340  * The largest value that can be entered in a variable
 341  * @param type the type of the variable
 342  */
 343 #define MAX_UVALUE(type) (static_cast<type>(~static_cast<type>(0)))
 344
 345 #if defined(_MSC_VER) && !defined(_DEBUG)
 346 #       define IGNORE_UNINITIALIZED_WARNING_START __pragma(warning(push)) __pragma(warning(disable:4700))
 347 #       define IGNORE_UNINITIALIZED_WARNING_STOP __pragma(warning(pop))
 348 #elif defined(__GNUC__) && !defined(_DEBUG)
 349 #       define HELPER0(x) #x
 350 #       define HELPER1(x) HELPER0(GCC diagnostic ignored x)
 351 #       define HELPER2(y) HELPER1(#y)
 352 #if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
 353 #       define IGNORE_UNINITIALIZED_WARNING_START \
 354                 _Pragma("GCC diagnostic push") \
 355                 _Pragma(HELPER2(-Wuninitialized)) \
 356                 _Pragma(HELPER2(-Wmaybe-uninitialized))
 357 #       define IGNORE_UNINITIALIZED_WARNING_STOP _Pragma("GCC diagnostic pop")
 358 #endif
 359 #endif
 360
 361 #ifndef IGNORE_UNINITIALIZED_WARNING_START
 362 #       define IGNORE_UNINITIALIZED_WARNING_START
 363 #       define IGNORE_UNINITIALIZED_WARNING_STOP
 364 #endif
 365
 366 #endif /* STDAFX_H */