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ruby--ruby/include/ruby/impl/arithmetic/fixnum.h

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sed -i s/RUBY3/RBIMPL/g Devs do not love "3". The only exception is RUBY3_KEYWORDS in parse.y, which seems unrelated to our interests.
2020-05-04 02:52:56 -04:00
#ifndef RBIMPL_ARITHMETIC_FIXNUM_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_ARITHMETIC_FIXNUM_H
add #include guard hack According to MSVC manual (*1), cl.exe can skip including a header file when that: - contains #pragma once, or - starts with #ifndef, or - starts with #if ! defined. GCC has a similar trick (*2), but it acts more stricter (e. g. there must be _no tokens_ outside of #ifndef...#endif). Sun C lacked #pragma once for a looong time. Oracle Developer Studio 12.5 finally implemented it, but we cannot assume such recent version. This changeset modifies header files so that each of them include strictly one #ifndef...#endif. I believe this is the most portable way to trigger compiler optimizations. [Bug #16770] *1: https://docs.microsoft.com/en-us/cpp/preprocessor/once *2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
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/**
Merge pull request #2991 from shyouhei/ruby.h Split ruby.h
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* @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.
sed -i s/RUBY3/RBIMPL/g Devs do not love "3". The only exception is RUBY3_KEYWORDS in parse.y, which seems unrelated to our interests.
2020-05-04 02:52:56 -04:00
* @warning Symbols prefixed with either `RBIMPL` or `ruby3` are
Merge pull request #2991 from shyouhei/ruby.h Split ruby.h
2020-04-08 00:28:13 -04:00
* 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 Handling of integers formerly known as Fixnums.
*/
#include "ruby/backward/2/limits.h"
#define FIXABLE RB_FIXABLE
#define FIXNUM_MAX RUBY_FIXNUM_MAX
#define FIXNUM_MIN RUBY_FIXNUM_MIN
#define NEGFIXABLE RB_NEGFIXABLE
#define POSFIXABLE RB_POSFIXABLE
/*
* FIXABLE can be applied to anything, from double to intmax_t. The problem is
* double. On a 64bit system RUBY_FIXNUM_MAX is 4,611,686,018,427,387,903,
* which is not representable by a double. The nearest value that a double can
* represent is 4,611,686,018,427,387,904, which is not fixable. The
* seemingly-stragne "< FIXNUM_MAX + 1" expression below is due to this.
*/
#define RB_POSFIXABLE(_) ((_) < RUBY_FIXNUM_MAX + 1)
#define RB_NEGFIXABLE(_) ((_) >= RUBY_FIXNUM_MIN)
#define RB_FIXABLE(_) (RB_POSFIXABLE(_) && RB_NEGFIXABLE(_))
#define RUBY_FIXNUM_MAX (LONG_MAX / 2)
#define RUBY_FIXNUM_MIN (LONG_MIN / 2)
sed -i s/RUBY3/RBIMPL/g Devs do not love "3". The only exception is RUBY3_KEYWORDS in parse.y, which seems unrelated to our interests.
2020-05-04 02:52:56 -04:00
#endif /* RBIMPL_ARITHMETIC_FIXNUM_H */
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