296 lines
10 KiB
C++
296 lines
10 KiB
C++
#ifndef RBIMPL_SPECIAL_CONSTS_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RBIMPL_SPECIAL_CONSTS_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 enum ::ruby_special_consts.
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* @see Sasada, K., "A Lightweight Representation of Floating-Point
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* Numbers on Ruby Interpreter", in proceedings of 10th JSSST
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* SIGPPL Workshop on Programming and Programming Languages
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* (PPL2008), pp. 9-16, 2008.
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*/
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#include "ruby/internal/attr/artificial.h"
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#include "ruby/internal/attr/const.h"
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#include "ruby/internal/attr/constexpr.h"
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#include "ruby/internal/attr/enum_extensibility.h"
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#include "ruby/internal/stdbool.h"
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#include "ruby/internal/value.h"
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/**
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* @private
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* @warning Do not touch this macro.
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* @warning It is an implementation detail.
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* @warning The value of this macro must match for ruby itself and all
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* extension libraries, otherwise serious memory corruption shall
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* occur.
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*/
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#if defined(USE_FLONUM)
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# /* Take that. */
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#elif SIZEOF_VALUE >= SIZEOF_DOUBLE
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# define USE_FLONUM 1
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#else
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# define USE_FLONUM 0
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#endif
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/** This is an old name of #RB_TEST. Not sure which name is preferred. */
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#define RTEST RB_TEST
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#define FIXNUM_P RB_FIXNUM_P /**< @old{RB_FIXNUM_P} */
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#define IMMEDIATE_P RB_IMMEDIATE_P /**< @old{RB_IMMEDIATE_P} */
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#define NIL_P RB_NIL_P /**< @old{RB_NIL_P} */
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#define SPECIAL_CONST_P RB_SPECIAL_CONST_P /**< @old{RB_SPECIAL_CONST_P} */
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#define STATIC_SYM_P RB_STATIC_SYM_P /**< @old{RB_STATIC_SYM_P} */
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#define Qfalse RUBY_Qfalse /**< @old{RUBY_Qfalse} */
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#define Qnil RUBY_Qnil /**< @old{RUBY_Qnil} */
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#define Qtrue RUBY_Qtrue /**< @old{RUBY_Qtrue} */
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#define Qundef RUBY_Qundef /**< @old{RUBY_Qundef} */
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#define FIXNUM_FLAG RUBY_FIXNUM_FLAG /**< @old{RUBY_FIXNUM_FLAG} */
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#define FLONUM_FLAG RUBY_FLONUM_FLAG /**< @old{RUBY_FLONUM_FLAG} */
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#define FLONUM_MASK RUBY_FLONUM_MASK /**< @old{RUBY_FLONUM_MASK} */
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#define FLONUM_P RB_FLONUM_P /**< @old{RB_FLONUM_P} */
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#define IMMEDIATE_MASK RUBY_IMMEDIATE_MASK /**< @old{RUBY_IMMEDIATE_MASK} */
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#define SYMBOL_FLAG RUBY_SYMBOL_FLAG /**< @old{RUBY_SYMBOL_FLAG} */
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/** @cond INTERNAL_MACRO */
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#define RB_FIXNUM_P RB_FIXNUM_P
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#define RB_FLONUM_P RB_FLONUM_P
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#define RB_IMMEDIATE_P RB_IMMEDIATE_P
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#define RB_NIL_P RB_NIL_P
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#define RB_SPECIAL_CONST_P RB_SPECIAL_CONST_P
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#define RB_STATIC_SYM_P RB_STATIC_SYM_P
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#define RB_TEST RB_TEST
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/** @endcond */
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/** special constants - i.e. non-zero and non-fixnum constants */
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enum
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RBIMPL_ATTR_ENUM_EXTENSIBILITY(closed)
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ruby_special_consts {
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#if defined(__DOXYGEN__)
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RUBY_Qfalse, /**< @see ::rb_cFalseClass */
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RUBY_Qtrue, /**< @see ::rb_cTrueClass */
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RUBY_Qnil, /**< @see ::rb_cNilClass */
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RUBY_Qundef, /**< Represents so-called undef. */
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RUBY_IMMEDIATE_MASK, /**< Bit mask detecting special consts. */
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RUBY_FIXNUM_FLAG, /**< Flag to denote a fixnum. */
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RUBY_FLONUM_MASK, /**< Bit mask detecting a flonum. */
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RUBY_FLONUM_FLAG, /**< Flag to denote a flonum. */
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RUBY_SYMBOL_FLAG, /**< Flag to denote a static symbol. */
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#elif USE_FLONUM
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RUBY_Qfalse = 0x00, /* ...0000 0000 */
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RUBY_Qtrue = 0x14, /* ...0001 0100 */
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RUBY_Qnil = 0x08, /* ...0000 1000 */
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RUBY_Qundef = 0x34, /* ...0011 0100 */
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RUBY_IMMEDIATE_MASK = 0x07, /* ...0000 0111 */
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RUBY_FIXNUM_FLAG = 0x01, /* ...xxxx xxx1 */
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RUBY_FLONUM_MASK = 0x03, /* ...0000 0011 */
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RUBY_FLONUM_FLAG = 0x02, /* ...xxxx xx10 */
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RUBY_SYMBOL_FLAG = 0x0c, /* ...xxxx 1100 */
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#else
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RUBY_Qfalse = 0x00, /* ...0000 0000 */
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RUBY_Qtrue = 0x02, /* ...0000 0010 */
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RUBY_Qnil = 0x04, /* ...0000 0100 */
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RUBY_Qundef = 0x06, /* ...0000 0110 */
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RUBY_IMMEDIATE_MASK = 0x03, /* ...0000 0011 */
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RUBY_FIXNUM_FLAG = 0x01, /* ...xxxx xxx1 */
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RUBY_FLONUM_MASK = 0x00, /* any values ANDed with FLONUM_MASK cannot be FLONUM_FLAG */
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RUBY_FLONUM_FLAG = 0x02, /* ...0000 0010 */
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RUBY_SYMBOL_FLAG = 0x0e, /* ...0000 1110 */
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#endif
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RUBY_SPECIAL_SHIFT = 8 /**< Least significant 8 bits are reserved. */
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};
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RBIMPL_ATTR_CONST()
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RBIMPL_ATTR_CONSTEXPR(CXX11)
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RBIMPL_ATTR_ARTIFICIAL()
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/**
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* Emulates Ruby's "if" statement.
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*
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* @param[in] obj An arbitrary ruby object.
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* @retval false `obj` is either ::RUBY_Qfalse or ::RUBY_Qnil.
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* @retval true Anything else.
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*
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* @internal
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*
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* It HAS to be `__attribute__((const))` in order for clang to properly deduce
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* `__builtin_assume()`.
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*/
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static inline bool
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RB_TEST(VALUE obj)
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{
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/*
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* Qfalse: ....0000 0000
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* Qnil: ....0000 1000
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* ~Qnil: ....1111 0111
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* v ....xxxx xxxx
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* ----------------------------
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* RTEST(v) ....xxxx 0xxx
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*
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* RTEST(v) can be 0 if and only if (v == Qfalse || v == Qnil).
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*/
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return obj & ~RUBY_Qnil;
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}
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RBIMPL_ATTR_CONST()
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RBIMPL_ATTR_CONSTEXPR(CXX11)
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RBIMPL_ATTR_ARTIFICIAL()
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/**
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* Checks if the given object is nil.
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*
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* @param[in] obj An arbitrary ruby object.
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* @retval true `obj` is ::RUBY_Qnil.
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* @retval false Anything else.
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*/
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static inline bool
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RB_NIL_P(VALUE obj)
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{
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return obj == RUBY_Qnil;
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}
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RBIMPL_ATTR_CONST()
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RBIMPL_ATTR_CONSTEXPR(CXX11)
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RBIMPL_ATTR_ARTIFICIAL()
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/**
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* Checks if the given object is a so-called Fixnum.
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*
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* @param[in] obj An arbitrary ruby object.
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* @retval true `obj` is a Fixnum.
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* @retval false Anything else.
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* @note Fixnum was a thing in the 20th century, but it is rather an
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* implementation detail today.
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*/
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static inline bool
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RB_FIXNUM_P(VALUE obj)
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{
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return obj & RUBY_FIXNUM_FLAG;
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}
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RBIMPL_ATTR_CONST()
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RBIMPL_ATTR_CONSTEXPR(CXX14)
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RBIMPL_ATTR_ARTIFICIAL()
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/**
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* Checks if the given object is a static symbol.
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*
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* @param[in] obj An arbitrary ruby object.
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* @retval true `obj` is a static symbol
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* @retval false Anything else.
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* @see RB_DYNAMIC_SYM_P()
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* @see RB_SYMBOL_P()
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* @note These days there are static and dynamic symbols, just like we
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* once had Fixnum/Bignum back in the old days.
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*/
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static inline bool
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RB_STATIC_SYM_P(VALUE obj)
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{
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RBIMPL_ATTR_CONSTEXPR(CXX14)
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const VALUE mask = ~(RBIMPL_VALUE_FULL << RUBY_SPECIAL_SHIFT);
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return (obj & mask) == RUBY_SYMBOL_FLAG;
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}
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RBIMPL_ATTR_CONST()
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RBIMPL_ATTR_CONSTEXPR(CXX11)
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RBIMPL_ATTR_ARTIFICIAL()
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/**
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* Checks if the given object is a so-called Flonum.
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*
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* @param[in] obj An arbitrary ruby object.
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* @retval true `obj` is a Flonum.
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* @retval false Anything else.
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* @see RB_FLOAT_TYPE_P()
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* @note These days there are Flonums and non-Flonum floats, just like we
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* once had Fixnum/Bignum back in the old days.
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*/
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static inline bool
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RB_FLONUM_P(VALUE obj)
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{
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#if USE_FLONUM
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return (obj & RUBY_FLONUM_MASK) == RUBY_FLONUM_FLAG;
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#else
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return false;
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#endif
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}
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RBIMPL_ATTR_CONST()
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RBIMPL_ATTR_CONSTEXPR(CXX11)
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RBIMPL_ATTR_ARTIFICIAL()
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/**
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* Checks if the given object is an immediate i.e. an object which has no
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* corresponding storage inside of the object space.
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*
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* @param[in] obj An arbitrary ruby object.
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* @retval true `obj` is a Flonum.
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* @retval false Anything else.
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* @see RB_FLOAT_TYPE_P()
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* @note The concept of "immediate" is purely C specific.
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*/
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static inline bool
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RB_IMMEDIATE_P(VALUE obj)
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{
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return obj & RUBY_IMMEDIATE_MASK;
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}
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RBIMPL_ATTR_CONST()
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RBIMPL_ATTR_CONSTEXPR(CXX11)
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RBIMPL_ATTR_ARTIFICIAL()
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/**
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* Checks if the given object is of enum ::ruby_special_consts.
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*
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* @param[in] obj An arbitrary ruby object.
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* @retval true `obj` is a special constant.
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* @retval false Anything else.
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*/
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static inline bool
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RB_SPECIAL_CONST_P(VALUE obj)
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{
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return RB_IMMEDIATE_P(obj) || ! RB_TEST(obj);
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}
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RBIMPL_ATTR_CONST()
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RBIMPL_ATTR_CONSTEXPR(CXX11)
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/**
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* Identical to RB_SPECIAL_CONST_P, except it returns a ::VALUE.
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*
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* @param[in] obj An arbitrary ruby object.
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* @retval RUBY_Qtrue `obj` is a special constant.
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* @retval RUBY_Qfalse Anything else.
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*
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* @internal
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*
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* This function is to mimic old rb_special_const_p macro but have anyone
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* actually used its return value? Wasn't it just something no one needed?
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*/
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static inline VALUE
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rb_special_const_p(VALUE obj)
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{
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return RB_SPECIAL_CONST_P(obj) * RUBY_Qtrue;
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}
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/**
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* @cond INTERNAL_MACRO
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* See [ruby-dev:27513] for the following macros.
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*/
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#define RUBY_Qfalse RBIMPL_CAST((VALUE)RUBY_Qfalse)
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#define RUBY_Qtrue RBIMPL_CAST((VALUE)RUBY_Qtrue)
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#define RUBY_Qnil RBIMPL_CAST((VALUE)RUBY_Qnil)
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#define RUBY_Qundef RBIMPL_CAST((VALUE)RUBY_Qundef)
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/** @endcond */
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#endif /* RBIMPL_SPECIAL_CONSTS_H */
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