base/port.h

   1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef BASE_PORT_H_
   6 #define BASE_PORT_H_
   7
   8 #include <stdarg.h>
   9 #include "build/build_config.h"
  10
  11 #ifdef COMPILER_MSVC
  12 #define GG_LONGLONG(x) x##I64
  13 #define GG_ULONGLONG(x) x##UI64
  14 #else
  15 #define GG_LONGLONG(x) x##LL
  16 #define GG_ULONGLONG(x) x##ULL
  17 #endif
  18
  19 // Per C99 7.8.14, define __STDC_CONSTANT_MACROS before including <stdint.h>
  20 // to get the INTn_C and UINTn_C macros for integer constants.  It's difficult
  21 // to guarantee any specific ordering of header includes, so it's difficult to
  22 // guarantee that the INTn_C macros can be defined by including <stdint.h> at
  23 // any specific point.  Provide GG_INTn_C macros instead.
  24
  25 #define GG_INT8_C(x)    (x)
  26 #define GG_INT16_C(x)   (x)
  27 #define GG_INT32_C(x)   (x)
  28 #define GG_INT64_C(x)   GG_LONGLONG(x)
  29
  30 #define GG_UINT8_C(x)   (x ## U)
  31 #define GG_UINT16_C(x)  (x ## U)
  32 #define GG_UINT32_C(x)  (x ## U)
  33 #define GG_UINT64_C(x)  GG_ULONGLONG(x)
  34
  35 // It's possible for functions that use a va_list, such as StringPrintf, to
  36 // invalidate the data in it upon use.  The fix is to make a copy of the
  37 // structure before using it and use that copy instead.  va_copy is provided
  38 // for this purpose.  MSVC does not provide va_copy, so define an
  39 // implementation here.  It is not guaranteed that assignment is a copy, so the
  40 // StringUtil.VariableArgsFunc unit test tests this capability.
  41 #if defined(COMPILER_GCC)
  42 #define GG_VA_COPY(a, b) (va_copy(a, b))
  43 #elif defined(COMPILER_MSVC)
  44 #define GG_VA_COPY(a, b) (a = b)
  45 #endif
  46
  47 // Define an OS-neutral wrapper for shared library entry points
  48 #if defined(OS_WIN)
  49 #define API_CALL __stdcall
  50 #else
  51 #define API_CALL
  52 #endif
  53
  54 #endif  // BASE_PORT_H_