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//opt/alt/ruby34/include/ruby/internal/attr/const.h
#ifndef RBIMPL_ATTR_CONST_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_ATTR_CONST_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_ATTR_CONST. */ #include "ruby/internal/compiler_since.h" #include "ruby/internal/has/attribute.h" #include "ruby/internal/has/declspec_attribute.h" /** Wraps (or simulates) `__attribute__((const))` */ #if RBIMPL_HAS_ATTRIBUTE(const) # define RBIMPL_ATTR_CONST() __attribute__((__const__)) #elif RBIMPL_HAS_DECLSPEC_ATTRIBUTE(noalias) # /* If a function can be a const, that is also a noalias. */ # define RBIMPL_ATTR_CONST() __declspec(noalias) #elif RBIMPL_COMPILER_SINCE(SunPro, 5, 10, 0) # define RBIMPL_ATTR_CONST() _Pragma("no_side_effect") #else # define RBIMPL_ATTR_CONST() /* void */ #endif /** Enables #RBIMPL_ATTR_CONST if and only if. ! #RUBY_DEBUG. */ #if !defined(RUBY_DEBUG) || !RUBY_DEBUG # define RBIMPL_ATTR_CONST_UNLESS_DEBUG() RBIMPL_ATTR_CONST() #else # define RBIMPL_ATTR_CONST_UNLESS_DEBUG() /* void */ #endif #endif /* RBIMPL_ATTR_CONST_H */
