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ruby--ruby/include/ruby/3/special_consts.h
卜部昌平 4ff3f20540 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
2020-04-13 16:06:00 +09:00

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#ifndef RUBY3_SPECIAL_CONSTS_H /*-*-C++-*-vi:se ft=cpp:*/
#define RUBY3_SPECIAL_CONSTS_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 `RUBY3` or `ruby3` 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 enum ::ruby_special_consts.
* @see Sasada, K., "A Lighweight Representation of Floting-Point
* Numbers on Ruby Interpreter", in proceedings of 10th JSSST
* SIGPPL Workshop on Programming and Programming Languages
* (PPL2008), pp. 9-16, 2008.
*/
#include "ruby/3/attr/artificial.h"
#include "ruby/3/attr/const.h"
#include "ruby/3/attr/constexpr.h"
#include "ruby/3/attr/enum_extensibility.h"
#include "ruby/3/stdbool.h"
#include "ruby/3/value.h"
#if defined(USE_FLONUM)
# /* Take that. */
#elif SIZEOF_VALUE >= SIZEOF_DOUBLE
# define USE_FLONUM 1
#else
# define USE_FLONUM 0
#endif
#define RTEST RB_TEST
#define FIXNUM_P RB_FIXNUM_P
#define IMMEDIATE_P RB_IMMEDIATE_P
#define NIL_P RB_NIL_P
#define SPECIAL_CONST_P RB_SPECIAL_CONST_P
#define STATIC_SYM_P RB_STATIC_SYM_P
#define Qfalse RUBY_Qfalse
#define Qnil RUBY_Qnil
#define Qtrue RUBY_Qtrue
#define Qundef RUBY_Qundef
/** @cond INTERNAL_MACRO */
#define FIXNUM_FLAG RUBY_FIXNUM_FLAG
#define FLONUM_FLAG RUBY_FLONUM_FLAG
#define FLONUM_MASK RUBY_FLONUM_MASK
#define FLONUM_P RB_FLONUM_P
#define IMMEDIATE_MASK RUBY_IMMEDIATE_MASK
#define SYMBOL_FLAG RUBY_SYMBOL_FLAG
#define RB_FIXNUM_P RB_FIXNUM_P
#define RB_FLONUM_P RB_FLONUM_P
#define RB_IMMEDIATE_P RB_IMMEDIATE_P
#define RB_NIL_P RB_NIL_P
#define RB_SPECIAL_CONST_P RB_SPECIAL_CONST_P
#define RB_STATIC_SYM_P RB_STATIC_SYM_P
#define RB_TEST RB_TEST
/** @endcond */
/** special constants - i.e. non-zero and non-fixnum constants */
enum
RUBY3_ATTR_ENUM_EXTENSIBILITY(closed)
ruby_special_consts {
#if USE_FLONUM
RUBY_Qfalse = 0x00, /* ...0000 0000 */
RUBY_Qtrue = 0x14, /* ...0001 0100 */
RUBY_Qnil = 0x08, /* ...0000 1000 */
RUBY_Qundef = 0x34, /* ...0011 0100 */
RUBY_IMMEDIATE_MASK = 0x07, /* ...0000 0111 */
RUBY_FIXNUM_FLAG = 0x01, /* ...xxxx xxx1 */
RUBY_FLONUM_MASK = 0x03, /* ...0000 0011 */
RUBY_FLONUM_FLAG = 0x02, /* ...xxxx xx10 */
RUBY_SYMBOL_FLAG = 0x0c /* ...xxxx 1100 */
#else
RUBY_Qfalse = 0x00, /* ...0000 0000 */
RUBY_Qtrue = 0x02, /* ...0000 0010 */
RUBY_Qnil = 0x04, /* ...0000 0100 */
RUBY_Qundef = 0x06, /* ...0000 0110 */
RUBY_IMMEDIATE_MASK = 0x03, /* ...0000 0011 */
RUBY_FIXNUM_FLAG = 0x01, /* ...xxxx xxx1 */
RUBY_FLONUM_MASK = 0x00, /* any values ANDed with FLONUM_MASK cannot be FLONUM_FLAG */
RUBY_FLONUM_FLAG = 0x02, /* ...0000 0010 */
RUBY_SYMBOL_FLAG = 0x0e /* ...0000 1110 */
#endif
};
/** Least significant 8 bits are reserved. */
enum { RUBY_SPECIAL_SHIFT = 8 };
RUBY3_ATTR_CONST()
RUBY3_ATTR_CONSTEXPR(CXX11)
RUBY3_ATTR_ARTIFICIAL()
/*
* :NOTE: ruby3_test HAS to be `__attribute__((const))` in order for clang to
* properly deduce `__builtin_assume()`.
*/
static inline bool
RB_TEST(VALUE obj)
{
/*
* Qfalse: ....0000 0000
* Qnil: ....0000 1000
* ~Qnil: ....1111 0111
* v ....xxxx xxxx
* ----------------------------
* RTEST(v) ....xxxx 0xxx
*
* RTEST(v) can be 0 if and only if (v == Qfalse || v == Qnil).
*/
return obj & ~RUBY_Qnil;
}
RUBY3_ATTR_CONST()
RUBY3_ATTR_CONSTEXPR(CXX11)
RUBY3_ATTR_ARTIFICIAL()
static inline bool
RB_NIL_P(VALUE obj)
{
return obj == RUBY_Qnil;
}
RUBY3_ATTR_CONST()
RUBY3_ATTR_CONSTEXPR(CXX11)
RUBY3_ATTR_ARTIFICIAL()
static inline bool
RB_FIXNUM_P(VALUE obj)
{
return obj & RUBY_FIXNUM_FLAG;
}
RUBY3_ATTR_CONST()
RUBY3_ATTR_CONSTEXPR(CXX14)
RUBY3_ATTR_ARTIFICIAL()
static inline bool
RB_STATIC_SYM_P(VALUE obj)
{
RUBY3_ATTR_CONSTEXPR(CXX14)
const VALUE mask = ~(RUBY3_VALUE_FULL << RUBY_SPECIAL_SHIFT);
return (obj & mask) == RUBY_SYMBOL_FLAG;
}
RUBY3_ATTR_CONST()
RUBY3_ATTR_CONSTEXPR(CXX11)
RUBY3_ATTR_ARTIFICIAL()
static inline bool
RB_FLONUM_P(VALUE obj)
{
#if USE_FLONUM
return (obj & RUBY_FLONUM_MASK) == RUBY_FLONUM_FLAG;
#else
return false;
#endif
}
RUBY3_ATTR_CONST()
RUBY3_ATTR_CONSTEXPR(CXX11)
RUBY3_ATTR_ARTIFICIAL()
static inline bool
RB_IMMEDIATE_P(VALUE obj)
{
return obj & RUBY_IMMEDIATE_MASK;
}
RUBY3_ATTR_CONST()
RUBY3_ATTR_CONSTEXPR(CXX11)
RUBY3_ATTR_ARTIFICIAL()
static inline bool
RB_SPECIAL_CONST_P(VALUE obj)
{
return RB_IMMEDIATE_P(obj) || ! RB_TEST(obj);
}
RUBY3_ATTR_CONST()
RUBY3_ATTR_CONSTEXPR(CXX11)
/* This function is to mimic old rb_special_const_p macro but have anyone
* actually used its return value? Wasn't it just something no one needed? */
static inline VALUE
rb_special_const_p(VALUE obj)
{
return RB_SPECIAL_CONST_P(obj) * RUBY_Qtrue;
}
/**
* @cond INTERNAL_MACRO
* See [ruby-dev:27513] for the following macros.
*/
#define RUBY_Qfalse RUBY3_CAST((VALUE)RUBY_Qfalse)
#define RUBY_Qtrue RUBY3_CAST((VALUE)RUBY_Qtrue)
#define RUBY_Qnil RUBY3_CAST((VALUE)RUBY_Qnil)
#define RUBY_Qundef RUBY3_CAST((VALUE)RUBY_Qundef)
/** @endcond */
#endif /* RUBY3_SPECIAL_CONSTS_H */
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