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Edit File : assume.h \| Size : 3.17 KB
#ifndef RBIMPL_ASSUME_H /--C++--vi:se ft=cpp:/ #define RBIMPL_ASSUME_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_ASSUME / #RBIMPL_UNREACHABLE. * * These macros must be defined at once because: * * - #RBIMPL_ASSUME could fallback to #RBIMPL_UNREACHABLE. * - #RBIMPL_UNREACHABLE could fallback to #RBIMPL_ASSUME. / #include "ruby/internal/config.h" #include "ruby/internal/cast.h" #include "ruby/internal/compiler_since.h" #include "ruby/internal/has/builtin.h" #include "ruby/internal/warning_push.h" /* @cond INTERNAL_MACRO / #if defined(HAVE___ASSUME) # define RBIMPL_HAVE___ASSUME #endif /* @endcond / /* Wraps (or simulates) `__builtin_unreachable`. / #if RBIMPL_HAS_BUILTIN(__builtin_unreachable) # define RBIMPL_UNREACHABLE_RETURN(_) __builtin_unreachable() #elif defined(RBIMPL_HAVE___ASSUME) # define RBIMPL_UNREACHABLE_RETURN(_) return (__assume(0), (_)) #else # define RBIMPL_UNREACHABLE_RETURN(_) return (_) #endif /* Wraps (or simulates) `__builtin_unreachable`. / #if RBIMPL_HAS_BUILTIN(__builtin_unreachable) # define RBIMPL_UNREACHABLE __builtin_unreachable #elif defined(RBIMPL_HAVE___ASSUME) # define RBIMPL_UNREACHABLE() __assume(0) #endif /* Wraps (or simulates) `__assume`. / #if RBIMPL_COMPILER_SINCE(Intel, 13, 0, 0) # / icc warnings are false positives. Ignore them. / # / "warning #2261: __assume expression with side effects discarded" / # define RBIMPL_ASSUME(expr) \ RBIMPL_WARNING_PUSH() \ RBIMPL_WARNING_IGNORED(2261) \ __assume(expr) \ RBIMPL_WARNING_POP() #elif defined(RBIMPL_HAVE___ASSUME) # define RBIMPL_ASSUME __assume #elif RBIMPL_HAS_BUILTIN(__builtin_assume) # define RBIMPL_ASSUME __builtin_assume #elif ! defined(RBIMPL_UNREACHABLE) # define RBIMPL_ASSUME(_) RBIMPL_CAST((void)(_)) #else # define RBIMPL_ASSUME(_) \ (RB_LIKELY(!!(_)) ? RBIMPL_CAST((void)0) : RBIMPL_UNREACHABLE()) #endif #if ! defined(RBIMPL_UNREACHABLE) # define RBIMPL_UNREACHABLE() RBIMPL_ASSUME(0) #endif #endif / RBIMPL_ASSUME_H */ Back

Edit File : assume.h | Size : 3.17 KB

#ifndef RBIMPL_ASSUME_H                              /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_ASSUME_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_ASSUME / #RBIMPL_UNREACHABLE.
 *
 * These macros must be defined at once because:
 *
 * - #RBIMPL_ASSUME could fallback to #RBIMPL_UNREACHABLE.
 * - #RBIMPL_UNREACHABLE could fallback to #RBIMPL_ASSUME.
 */
#include "ruby/internal/config.h"
#include "ruby/internal/cast.h"
#include "ruby/internal/compiler_since.h"
#include "ruby/internal/has/builtin.h"
#include "ruby/internal/warning_push.h"

/** @cond INTERNAL_MACRO */
#if defined(HAVE___ASSUME)
# define RBIMPL_HAVE___ASSUME
#endif
/** @endcond */

/** Wraps (or simulates) `__builtin_unreachable`. */
#if RBIMPL_HAS_BUILTIN(__builtin_unreachable)
# define RBIMPL_UNREACHABLE_RETURN(_) __builtin_unreachable()

#elif defined(RBIMPL_HAVE___ASSUME)
# define RBIMPL_UNREACHABLE_RETURN(_) return (__assume(0), (_))

#else
# define RBIMPL_UNREACHABLE_RETURN(_) return (_)
#endif

/** Wraps (or simulates) `__builtin_unreachable`. */
#if RBIMPL_HAS_BUILTIN(__builtin_unreachable)
# define RBIMPL_UNREACHABLE __builtin_unreachable

#elif defined(RBIMPL_HAVE___ASSUME)
# define RBIMPL_UNREACHABLE() __assume(0)
#endif

/** Wraps (or simulates) `__assume`. */
#if RBIMPL_COMPILER_SINCE(Intel, 13, 0, 0)
# /* icc warnings are false positives.  Ignore them. */
# /* "warning #2261: __assume expression with side effects discarded" */
# define RBIMPL_ASSUME(expr)     \
    RBIMPL_WARNING_PUSH()        \
    RBIMPL_WARNING_IGNORED(2261) \
    __assume(expr)              \
    RBIMPL_WARNING_POP()

#elif defined(RBIMPL_HAVE___ASSUME)
# define RBIMPL_ASSUME __assume

#elif RBIMPL_HAS_BUILTIN(__builtin_assume)
# define RBIMPL_ASSUME __builtin_assume

#elif ! defined(RBIMPL_UNREACHABLE)
# define RBIMPL_ASSUME(_) RBIMPL_CAST((void)(_))

#else
# define RBIMPL_ASSUME(_) \
    (RB_LIKELY(!!(_)) ? RBIMPL_CAST((void)0) : RBIMPL_UNREACHABLE())
#endif

#if ! defined(RBIMPL_UNREACHABLE)
# define RBIMPL_UNREACHABLE() RBIMPL_ASSUME(0)
#endif

#endif /* RBIMPL_ASSUME_H */

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