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46 lines
2.2 KiB
C++
46 lines
2.2 KiB
C++
#ifndef RBIMPL_ATTR_CONST_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RBIMPL_ATTR_CONST_H
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/**
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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 `RBIMPL` or `rbimpl` 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 #RBIMPL_ATTR_CONST.
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*/
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#include "ruby/internal/compiler_since.h"
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#include "ruby/internal/has/attribute.h"
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#include "ruby/internal/has/declspec_attribute.h"
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/** Wraps (or simulates) `__attribute__((const))` */
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#if RBIMPL_HAS_ATTRIBUTE(const)
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# define RBIMPL_ATTR_CONST() __attribute__((__const__))
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#elif RBIMPL_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 RBIMPL_ATTR_CONST() __declspec(noalias)
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#elif RBIMPL_COMPILER_SINCE(SunPro, 5, 10, 0)
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# define RBIMPL_ATTR_CONST() _Pragma("no_side_effect")
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#else
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# define RBIMPL_ATTR_CONST() /* void */
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#endif
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/** Enables #RBIMPL_ATTR_CONST if and only if. ! #RUBY_DEBUG. */
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#if !defined(RUBY_DEBUG) || !RUBY_DEBUG
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# define RBIMPL_ATTR_CONST_UNLESS_DEBUG() RBIMPL_ATTR_CONST()
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#else
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# define RBIMPL_ATTR_CONST_UNLESS_DEBUG() /* void */
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#endif
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#endif /* RBIMPL_ATTR_CONST_H */
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