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