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Diffstat (limited to 'include/ruby/internal/dllexport.h')
| -rw-r--r-- | include/ruby/internal/dllexport.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/include/ruby/internal/dllexport.h b/include/ruby/internal/dllexport.h new file mode 100644 index 0000000000..71026e7100 --- /dev/null +++ b/include/ruby/internal/dllexport.h @@ -0,0 +1,80 @@ +#ifndef RBIMPL_DLLEXPORT_H /*-*-C++-*-vi:se ft=cpp:*/ +#define RBIMPL_DLLEXPORT_H +/** + * @file + * @author Ruby developers <ruby-core@ruby-lang.org> + * @copyright This file is a part of the programming language Ruby. + * Permission is hereby granted, to either redistribute and/or + * modify this file, provided that the conditions mentioned in the + * file COPYING are met. Consult the file for details. + * @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are + * implementation details. Don't take them as canon. They could + * rapidly appear then vanish. The name (path) of this header file + * is also an implementation detail. Do not expect it to persist + * at the place it is now. Developers are free to move it anywhere + * anytime at will. + * @note To ruby-core: remember that this header can be possibly + * 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 Tweaking visibility of C variables/functions. + */ +#include "ruby/internal/config.h" +#include "ruby/internal/compiler_is.h" + +/** + * 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(RUBY_EXPORT) +# define RUBY_EXTERN extern +#elif defined(_WIN32) +# define RUBY_EXTERN extern __declspec(dllimport) +#else +# define RUBY_EXTERN extern +#endif + +#ifndef RUBY_SYMBOL_EXPORT_BEGIN +# define RUBY_SYMBOL_EXPORT_BEGIN /* begin */ +#endif + +#ifndef RUBY_SYMBOL_EXPORT_END +# define RUBY_SYMBOL_EXPORT_END /* end */ +#endif + +#ifndef RUBY_FUNC_EXPORTED +# define RUBY_FUNC_EXPORTED /* void */ +#endif + +/** @endcond */ + +/** Shortcut macro equivalent to `RUBY_SYMBOL_EXPORT_BEGIN extern "C" {`. + * \@shyouhei finds it handy. */ +#if defined(__DOXYGEN__) +# define RBIMPL_SYMBOL_EXPORT_BEGIN() /* void */ +#elif defined(__cplusplus) +# define RBIMPL_SYMBOL_EXPORT_BEGIN() RUBY_SYMBOL_EXPORT_BEGIN extern "C" { +#else +# define RBIMPL_SYMBOL_EXPORT_BEGIN() RUBY_SYMBOL_EXPORT_BEGIN +#endif + +/** Counterpart of #RBIMPL_SYMBOL_EXPORT_BEGIN */ +#if defined(__DOXYGEN__) +# define RBIMPL_SYMBOL_EXPORT_END() /* void */ +#elif defined(__cplusplus) +# define RBIMPL_SYMBOL_EXPORT_END() } RUBY_SYMBOL_EXPORT_END +#else +# define RBIMPL_SYMBOL_EXPORT_END() RUBY_SYMBOL_EXPORT_END +#endif +#endif /* RBIMPL_DLLEXPORT_H */ |