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51 lines
2.1 KiB
C
51 lines
2.1 KiB
C
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/** \noop-*-C++-*-vi:ft=cpp
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @warning Symbols prefixed with either `RUBY3` or `ruby3` are
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* implementation details. Don't take them as canon. They could
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* rapidly appear then vanish. The name (path) of this header file
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* is also an implementation detail. Do not expect it to persist
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* at the place it is now. Developers are free to move it anywhere
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* anytime at will.
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* @note To ruby-core: remember that this header can be possibly
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* recursively included from extension libraries written in C++.
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* Do not expect for instance `__VA_ARGS__` is always available.
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* We assume C99 for ruby itself but we don't assume languages of
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* extension libraries. They could be written in C++98.
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* @brief Defines #RUBY3_ATTR_CONST.
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*/
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#include "ruby/3/has/declspec_attribute.h"
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/** Wraps (or simulates) `__attribute__((const))` */
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#if defined(RUBY3_ATTR_CONST)
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# /* Take that. */
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#elif RUBY3_HAS_ATTRIBUTE(const)
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# define RUBY3_ATTR_CONST() __attribute__((__const__))
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#elif RUBY3_HAS_DECLSPEC_ATTRIBUTE(noalias)
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# /* If a function can be a const, that is also a noalias. */
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# define RUBY3_ATTR_CONST() __declspec(noalias)
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#elif RUBY3_COMPILER_SINCE(SunPro, 5, 10, 0)
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# define RUBY3_ATTR_CONST() _Pragma("no_side_effect")
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#else
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# define RUBY3_ATTR_CONST() /* void */
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#endif
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/** Enables #RUBY3_ATTR_CONST iff. #RUBY_NDEBUG. */
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#if defined(RUBY3_ATTR_CONST_ON_NDEBUG)
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# /* Take that. */
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#elif RUBY_NDEBUG
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# define RUBY3_ATTR_CONST_ON_NDEBUG() RUBY3_ATTR_CONST()
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#else
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# define RUBY3_ATTR_CONST_ON_NDEBUG() /* void */
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#endif
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