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Diffstat (limited to 'include/ruby/3/attr/restrict.h')
| -rw-r--r-- | include/ruby/3/attr/restrict.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/include/ruby/3/attr/restrict.h b/include/ruby/3/attr/restrict.h new file mode 100644 index 0000000000..cd753584dd --- /dev/null +++ b/include/ruby/3/attr/restrict.h @@ -0,0 +1,44 @@ +/** \noop-*-C++-*-vi:ft=cpp + * @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 `RUBY3` or `ruby3` 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 #RUBY3_ATTR_RESTRICT. + */ +#include "ruby/3/compiler_since.h" +#include "ruby/3/has/attribute.h" +#include "ruby/3/token_paste.h" + +/* :FIXME: config.h includes conflicting `#define restrict`. MSVC can be + * detected using `RUBY3_COMPILER_SINCE()`, but Clang & family cannot use + * `__has_declspec_attribute()` which involves macro substitution. */ + +/** Wraps (or simulates) `__declspec(restrict)` */ +#if defined(RUBY3_ATTR_RESTRICT) +# /* Take that. */ + +#elif RUBY3_COMPILER_SINCE(MSVC, 14, 0, 0) +# define RUBY3_ATTR_RESTRICT() __declspec(RUBY3_TOKEN_PASTE(re, strict)) + +#elif RUBY3_HAS_ATTRIBUTE(malloc) +# define RUBY3_ATTR_RESTRICT() __attribute__((__malloc__)) + +#elif RUBY3_COMPILER_SINCE(SunPro, 5, 10, 0) +# define RUBY3_ATTR_RESTRICT() _Pragma("returns_new_memory") + +#else +# define RUBY3_ATTR_RESTRICT() /* void */ +#endif |