diff options
Diffstat (limited to 'include/ruby/internal/dllexport.h')
| -rw-r--r-- | include/ruby/internal/dllexport.h | 46 |
1 files changed, 17 insertions, 29 deletions
diff --git a/include/ruby/internal/dllexport.h b/include/ruby/internal/dllexport.h index 1488140854..71026e7100 100644 --- a/include/ruby/internal/dllexport.h +++ b/include/ruby/internal/dllexport.h @@ -17,18 +17,27 @@ * recursively included from extension libraries written in C++. * Do not expect for instance `__VA_ARGS__` is always available. * We assume C99 for ruby itself but we don't assume languages of - * extension libraries. They could be written in C++98. - * @brief Tewaking visibility of C variables/functions. + * extension libraries. They could be written in C++98. + * @brief Tweaking visibility of C variables/functions. */ #include "ruby/internal/config.h" #include "ruby/internal/compiler_is.h" -/* For MinGW, we need __declspec(dllimport) for RUBY_EXTERN on MJIT. - mswin's RUBY_EXTERN already has that. See also: win32/Makefile.sub */ +/** + * Declaration of externally visible global variables. Here "externally" means + * they should be visible from extension libraries. Depending on operating + * systems (dynamic linkers, to be precise), global variables inside of a DLL + * may or may not be visible form outside of that DLL by default. This + * declaration manually tweaks that default and ensures the declared variable + * be truly globally visible. + * + * ```CXX + * extern VALUE foo; // hidden on some OS + * RUBY_EXTERN VALUE foo; // ensure visible + * ``` + */ #undef RUBY_EXTERN -#if defined(MJIT_HEADER) && defined(_WIN32) -# define RUBY_EXTERN extern __declspec(dllimport) -#elif defined(RUBY_EXPORT) +#if defined(RUBY_EXPORT) # define RUBY_EXTERN extern #elif defined(_WIN32) # define RUBY_EXTERN extern __declspec(dllimport) @@ -48,28 +57,7 @@ # define RUBY_FUNC_EXPORTED /* void */ #endif -/* These macros are used for functions which are exported only for MJIT - and NOT ensured to be exported in future versions. */ - -#if ! defined(MJIT_HEADER) -# define MJIT_FUNC_EXPORTED RUBY_FUNC_EXPORTED -#elif ! RBIMPL_COMPILER_IS(MSVC) -# define MJIT_FUNC_EXPORTED RUBY_FUNC_EXPORTED -#else -# define MJIT_FUNC_EXPORTED static -#endif - -#define MJIT_SYMBOL_EXPORT_BEGIN RUBY_SYMBOL_EXPORT_BEGIN -#define MJIT_SYMBOL_EXPORT_END RUBY_SYMBOL_EXPORT_END - -/* On mswin, MJIT header transformation can't be used since cl.exe can't output - preprocessed output preserving macros. So this `MJIT_STATIC` is needed - to force non-static function to static on MJIT header to avoid symbol conflict. */ -#ifdef MJIT_HEADER -# define MJIT_STATIC static -#else -# define MJIT_STATIC -#endif +/** @endcond */ /** Shortcut macro equivalent to `RUBY_SYMBOL_EXPORT_BEGIN extern "C" {`. * \@shyouhei finds it handy. */ |