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Types.h
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Types.h
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* mfbt foundational types and macros. */
#ifndef mozilla_Types_h_
#define mozilla_Types_h_
/*
* This header must be valid C and C++, includable by code embedding either
* SpiderMonkey or Gecko.
*/
/*
* Expose all the integer types defined in C99's <stdint.h> (and the integer
* limit and constant macros, if compiling C code or if compiling C++ code and
* the right __STDC_*_MACRO has been defined for each). These are all usable
* throughout mfbt code, and throughout Mozilla code more generally.
*/
#include "mozilla/StandardInteger.h"
/* Also expose size_t. */
#include <stddef.h>
/* Implement compiler and linker macros needed for APIs. */
/*
* MOZ_EXPORT_API is used to declare and define a method which is externally
* visible to users of the current library. It encapsulates various decorations
* needed to properly export the method's symbol. MOZ_EXPORT_DATA serves the
* same purpose for data.
*
* api.h:
* extern MOZ_EXPORT_API(int) MeaningOfLife(void);
* extern MOZ_EXPORT_DATA(int) LuggageCombination;
*
* api.c:
* MOZ_EXPORT_API(int) MeaningOfLife(void) { return 42; }
* MOZ_EXPORT_DATA(int) LuggageCombination = 12345;
*
* If you are merely sharing a method across files, just use plain |extern|.
* These macros are designed for use by library interfaces -- not for normal
* methods or data used cross-file.
*/
#if defined(WIN32) || defined(XP_OS2)
# define MOZ_EXPORT_API(type) __declspec(dllexport) type
# define MOZ_EXPORT_DATA(type) __declspec(dllexport) type
#else /* Unix */
# ifdef HAVE_VISIBILITY_ATTRIBUTE
# define MOZ_EXTERNAL_VIS __attribute__((visibility("default")))
# elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
# define MOZ_EXTERNAL_VIS __global
# else
# define MOZ_EXTERNAL_VIS
# endif
# define MOZ_EXPORT_API(type) MOZ_EXTERNAL_VIS type
# define MOZ_EXPORT_DATA(type) MOZ_EXTERNAL_VIS type
#endif
/*
* Whereas implementers use MOZ_EXPORT_API and MOZ_EXPORT_DATA to declare and
* define library symbols, users use MOZ_IMPORT_API and MOZ_IMPORT_DATA to
* access them. Most often the implementer of the library will expose an API
* macro which expands to either the export or import version of the macro,
* depending upon the compilation mode.
*/
#ifdef _WIN32
# if defined(__MWERKS__)
# define MOZ_IMPORT_API(x) x
# else
# define MOZ_IMPORT_API(x) __declspec(dllimport) x
# endif
#elif defined(XP_OS2)
# define MOZ_IMPORT_API(x) __declspec(dllimport) x
#else
# define MOZ_IMPORT_API(x) MOZ_EXPORT_API(x)
#endif
#if defined(_WIN32) && !defined(__MWERKS__)
# define MOZ_IMPORT_DATA(x) __declspec(dllimport) x
#elif defined(XP_OS2)
# define MOZ_IMPORT_DATA(x) __declspec(dllimport) x
#else
# define MOZ_IMPORT_DATA(x) MOZ_EXPORT_DATA(x)
#endif
/*
* Consistent with the above comment, the MFBT_API and MFBT_DATA macros expose
* export mfbt declarations when building mfbt, and they expose import mfbt
* declarations when using mfbt.
*/
#if defined(IMPL_MFBT)
# define MFBT_API(type) MOZ_EXPORT_API(type)
# define MFBT_DATA(type) MOZ_EXPORT_DATA(type)
#else
/*
* When mozglue is linked in the program, we need the MFBT API symbols
* to be weak.
*/
# if defined(MOZ_GLUE_IN_PROGRAM)
# define MFBT_API(type) __attribute__((weak)) MOZ_IMPORT_API(type)
# define MFBT_DATA(type) __attribute__((weak)) MOZ_IMPORT_DATA(type)
# else
# define MFBT_API(type) MOZ_IMPORT_API(type)
# define MFBT_DATA(type) MOZ_IMPORT_DATA(type)
# endif
#endif
/*
* C symbols in C++ code must be declared immediately within |extern "C"|
* blocks. However, in C code, they need not be declared specially. This
* difference is abstracted behind the MOZ_BEGIN_EXTERN_C and MOZ_END_EXTERN_C
* macros, so that the user need not know whether he is being used in C or C++
* code.
*
* MOZ_BEGIN_EXTERN_C
*
* extern MOZ_EXPORT_API(int) MostRandomNumber(void);
* ...other declarations...
*
* MOZ_END_EXTERN_C
*
* This said, it is preferable to just use |extern "C"| in C++ header files for
* its greater clarity.
*/
#ifdef __cplusplus
# define MOZ_BEGIN_EXTERN_C extern "C" {
# define MOZ_END_EXTERN_C }
#else
# define MOZ_BEGIN_EXTERN_C
# define MOZ_END_EXTERN_C
#endif
#endif /* mozilla_Types_h_ */