mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
3e92785fd6
icc warns side effects for RUBY3_ASSUME like this: > ./include/ruby/3/value_type.h(202): warning #2261: __assume expression with side effects discarded > RUBY3_ASSUME(RB_FLONUM_P(obj)); > ^ Which is a false positive (RB_FLONUM_P has no side effect). It seems there is no way for us to tell icc that a functin is safe inside of __assume. Just suppress the warning instead.
89 lines
3.2 KiB
C++
89 lines
3.2 KiB
C++
/** \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_ASSUME / #RUBY3_UNREACHABLE.
|
|
*
|
|
* These macros must be defined at once because:
|
|
*
|
|
* - #RUBY3_ASSUME could fallback to #RUBY3_UNREACHABLE.
|
|
* - #RUBY3_UNREACHABLE could fallback to #RUBY3_ASSUME.
|
|
*/
|
|
#ifndef RUBY3_ASSUME_H
|
|
#define RUBY3_ASSUME_H
|
|
#include "ruby/3/config.h"
|
|
#include "ruby/3/cast.h"
|
|
#include "ruby/3/has/builtin.h"
|
|
#include "ruby/3/warning_push.h"
|
|
|
|
/** @cond INTERNAL_MACRO */
|
|
#if RUBY3_COMPILER_SINCE(MSVC, 13, 10, 0)
|
|
# define RUBY3_HAVE___ASSUME
|
|
|
|
#elif RUBY3_COMPILER_SINCE(Intel, 13, 0, 0)
|
|
# define RUBY3_HAVE___ASSUME
|
|
#endif
|
|
/** @endcond */
|
|
|
|
/** Wraps (or simulates) `__builtin_unreachable`. */
|
|
#if RUBY3_HAS_BUILTIN(__builtin_unreachable)
|
|
# define RUBY3_UNREACHABLE_RETURN(_) __builtin_unreachable()
|
|
|
|
#elif defined(RUBY3_HAVE___ASSUME)
|
|
# define RUBY3_UNREACHABLE_RETURN(_) return (__assume(0), (_))
|
|
|
|
#else
|
|
# define RUBY3_UNREACHABLE_RETURN(_) return (_)
|
|
#endif
|
|
|
|
/** Wraps (or simulates) `__builtin_unreachable`. */
|
|
#if RUBY3_HAS_BUILTIN(__builtin_unreachable)
|
|
# define RUBY3_UNREACHABLE __builtin_unreachable
|
|
|
|
#elif defined(RUBY3_HAVE___ASSUME)
|
|
# define RUBY3_UNREACHABLE() __assume(0)
|
|
#endif
|
|
|
|
/** Wraps (or simulates) `__asume`. */
|
|
#if RUBY3_COMPILER_SINCE(Intel, 13, 0, 0)
|
|
# /* icc warnings are false positives. Ignore them. */
|
|
# /* "warning #2261: __assume expression with side effects discarded" */
|
|
# define RUBY3_ASSUME(expr) \
|
|
RUBY3_WARNING_PUSH() \
|
|
RUBY3_WARNING_IGNORED(2261) \
|
|
__assume(expr) \
|
|
RUBY3_WARNING_POP()
|
|
|
|
#elif defined(RUBY3_HAVE___ASSUME)
|
|
# define RUBY3_ASSUME __assume
|
|
|
|
#elif RUBY3_HAS_BUILTIN(__builtin_assume)
|
|
# define RUBY3_ASSUME __builtin_assume
|
|
|
|
#elif ! defined(RUBY3_UNREACHABLE)
|
|
# define RUBY3_ASSUME(_) RUBY3_CAST((void)(_))
|
|
|
|
#else
|
|
# define RUBY3_ASSUME(_) \
|
|
(RB_LIKELY(!!(_)) ? RUBY3_CAST((void)0) : RUBY3_UNREACHABLE())
|
|
#endif
|
|
|
|
#if ! defined(RUBY3_UNREACHABLE)
|
|
# define RUBY3_UNREACHABLE() RUBY3_ASSUME(0)
|
|
#endif
|
|
|
|
#endif /* RUBY3_ASSUME_H */
|