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Diffstat (limited to 'include/ruby/backward/2/assume.h')
| -rw-r--r-- | include/ruby/backward/2/assume.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/include/ruby/backward/2/assume.h b/include/ruby/backward/2/assume.h new file mode 100644 index 0000000000..2be231093b --- /dev/null +++ b/include/ruby/backward/2/assume.h @@ -0,0 +1,39 @@ +/** \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 #ASSUME / #RB_LIKELY / #UNREACHABLE + */ +#include "ruby/3/config.h" +#include "ruby/3/assume.h" +#include "ruby/3/has/builtin.h" + +#undef ASSUME /* Kill config.h definition */ +#undef UNREACHABLE /* Kill config.h definition */ +#define ASSUME RUBY3_ASSUME +#define UNREACHABLE RUBY3_UNREACHABLE() +#define UNREACHABLE_RETURN RUBY3_UNREACHABLE_RETURN + +/* likely */ +#if RUBY3_HAS_BUILTIN(__builtin_expect) +# define RB_LIKELY(x) (__builtin_expect(!!(x), 1)) +# define RB_UNLIKELY(x) (__builtin_expect(!!(x), 0)) + +#else +# define RB_LIKELY(x) (x) +# define RB_UNLIKELY(x) (x) +#endif |