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Diffstat (limited to 'include/ruby/internal/attr/packed_struct.h')
| -rw-r--r-- | include/ruby/internal/attr/packed_struct.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/include/ruby/internal/attr/packed_struct.h b/include/ruby/internal/attr/packed_struct.h new file mode 100644 index 0000000000..0678b9acc8 --- /dev/null +++ b/include/ruby/internal/attr/packed_struct.h @@ -0,0 +1,43 @@ +#ifndef RBIMPL_ATTR_PACKED_STRUCT_H /*-*-C++-*-vi:se ft=cpp:*/ +#define RBIMPL_ATTR_PACKED_STRUCT_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 Defines #RBIMPL_ATTR_PACKED_STRUCT_BEGIN, + * #RBIMPL_ATTR_PACKED_STRUCT_END, + * #RBIMPL_ATTR_PACKED_STRUCT_UNALIGNED_BEGIN, and + * #RBIMPL_ATTR_PACKED_STRUCT_UNALIGNED_END. + */ +#include "ruby/internal/config.h" + +#ifndef RBIMPL_ATTR_PACKED_STRUCT_BEGIN +# define RBIMPL_ATTR_PACKED_STRUCT_BEGIN() /* void */ +#endif +#ifndef RBIMPL_ATTR_PACKED_STRUCT_END +# define RBIMPL_ATTR_PACKED_STRUCT_END() /* void */ +#endif + +#if UNALIGNED_WORD_ACCESS +# define RBIMPL_ATTR_PACKED_STRUCT_UNALIGNED_BEGIN() RBIMPL_ATTR_PACKED_STRUCT_BEGIN() +# define RBIMPL_ATTR_PACKED_STRUCT_UNALIGNED_END() RBIMPL_ATTR_PACKED_STRUCT_END() +#else +# define RBIMPL_ATTR_PACKED_STRUCT_UNALIGNED_BEGIN() /* void */ +# define RBIMPL_ATTR_PACKED_STRUCT_UNALIGNED_END() /* void */ +#endif + +#endif |