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special_consts.h
#ifndef RBIMPL_SPECIAL_CONSTS_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_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 `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 enum ::ruby_special_consts. * @see Sasada, K., "A Lightweight Representation of Floating-Point * Numbers on Ruby Interpreter", in proceedings of 10th JSSST * SIGPPL Workshop on Programming and Programming Languages * (PPL2008), pp. 9-16, 2008. */ #include "ruby/internal/attr/artificial.h" #include "ruby/internal/attr/const.h" #include "ruby/internal/attr/constexpr.h" #include "ruby/internal/attr/enum_extensibility.h" #include "ruby/internal/stdbool.h" #include "ruby/internal/value.h" /** * @private * @warning Do not touch this macro. * @warning It is an implementation detail. * @warning The value of this macro must match for ruby itself and all * extension libraries, otherwise serious memory corruption shall * occur. */ #if defined(USE_FLONUM) # /* Take that. */ #elif SIZEOF_VALUE >= SIZEOF_DOUBLE # define USE_FLONUM 1 #else # define USE_FLONUM 0 #endif /** This is an old name of #RB_TEST. Not sure which name is preferred. */ #define RTEST RB_TEST #define FIXNUM_P RB_FIXNUM_P /**< @old{RB_FIXNUM_P} */ #define IMMEDIATE_P RB_IMMEDIATE_P /**< @old{RB_IMMEDIATE_P} */ #define NIL_P RB_NIL_P /**< @old{RB_NIL_P} */ #define SPECIAL_CONST_P RB_SPECIAL_CONST_P /**< @old{RB_SPECIAL_CONST_P} */ #define STATIC_SYM_P RB_STATIC_SYM_P /**< @old{RB_STATIC_SYM_P} */ #define Qfalse RUBY_Qfalse /**< @old{RUBY_Qfalse} */ #define Qnil RUBY_Qnil /**< @old{RUBY_Qnil} */ #define Qtrue RUBY_Qtrue /**< @old{RUBY_Qtrue} */ #define Qundef RUBY_Qundef /**< @old{RUBY_Qundef} */ #define FIXNUM_FLAG RUBY_FIXNUM_FLAG /**< @old{RUBY_FIXNUM_FLAG} */ #define FLONUM_FLAG RUBY_FLONUM_FLAG /**< @old{RUBY_FLONUM_FLAG} */ #define FLONUM_MASK RUBY_FLONUM_MASK /**< @old{RUBY_FLONUM_MASK} */ #define FLONUM_P RB_FLONUM_P /**< @old{RB_FLONUM_P} */ #define IMMEDIATE_MASK RUBY_IMMEDIATE_MASK /**< @old{RUBY_IMMEDIATE_MASK} */ #define SYMBOL_FLAG RUBY_SYMBOL_FLAG /**< @old{RUBY_SYMBOL_FLAG} */ /** @cond INTERNAL_MACRO */ #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 RBIMPL_ATTR_ENUM_EXTENSIBILITY(closed) ruby_special_consts { #if defined(__DOXYGEN__) RUBY_Qfalse, /**< @see ::rb_cFalseClass */ RUBY_Qtrue, /**< @see ::rb_cTrueClass */ RUBY_Qnil, /**< @see ::rb_cNilClass */ RUBY_Qundef, /**< Represents so-called undef. */ RUBY_IMMEDIATE_MASK, /**< Bit mask detecting special consts. */ RUBY_FIXNUM_FLAG, /**< Flag to denote a fixnum. */ RUBY_FLONUM_MASK, /**< Bit mask detecting a flonum. */ RUBY_FLONUM_FLAG, /**< Flag to denote a flonum. */ RUBY_SYMBOL_FLAG, /**< Flag to denote a static symbol. */ #elif 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 RUBY_SPECIAL_SHIFT = 8 /**< Least significant 8 bits are reserved. */ }; RBIMPL_ATTR_CONST() RBIMPL_ATTR_CONSTEXPR(CXX11) RBIMPL_ATTR_ARTIFICIAL() /** * Emulates Ruby's "if" statement. * * @param[in] obj An arbitrary ruby object. * @retval false `obj` is either ::RUBY_Qfalse or ::RUBY_Qnil. * @retval true Anything else. * * @internal * * It 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; } RBIMPL_ATTR_CONST() RBIMPL_ATTR_CONSTEXPR(CXX11) RBIMPL_ATTR_ARTIFICIAL() /** * Checks if the given object is nil. * * @param[in] obj An arbitrary ruby object. * @retval true `obj` is ::RUBY_Qnil. * @retval false Anything else. */ static inline bool RB_NIL_P(VALUE obj) { return obj == RUBY_Qnil; } RBIMPL_ATTR_CONST() RBIMPL_ATTR_CONSTEXPR(CXX11) RBIMPL_ATTR_ARTIFICIAL() /** * Checks if the given object is a so-called Fixnum. * * @param[in] obj An arbitrary ruby object. * @retval true `obj` is a Fixnum. * @retval false Anything else. * @note Fixnum was a thing in the 20th century, but it is rather an * implementation detail today. */ static inline bool RB_FIXNUM_P(VALUE obj) { return obj & RUBY_FIXNUM_FLAG; } RBIMPL_ATTR_CONST() RBIMPL_ATTR_CONSTEXPR(CXX14) RBIMPL_ATTR_ARTIFICIAL() /** * Checks if the given object is a static symbol. * * @param[in] obj An arbitrary ruby object. * @retval true `obj` is a static symbol * @retval false Anything else. * @see RB_DYNAMIC_SYM_P() * @see RB_SYMBOL_P() * @note These days there are static and dynamic symbols, just like we * once had Fixnum/Bignum back in the old days. */ static inline bool RB_STATIC_SYM_P(VALUE obj) { RBIMPL_ATTR_CONSTEXPR(CXX14) const VALUE mask = ~(RBIMPL_VALUE_FULL << RUBY_SPECIAL_SHIFT); return (obj & mask) == RUBY_SYMBOL_FLAG; } RBIMPL_ATTR_CONST() RBIMPL_ATTR_CONSTEXPR(CXX11) RBIMPL_ATTR_ARTIFICIAL() /** * Checks if the given object is a so-called Flonum. * * @param[in] obj An arbitrary ruby object. * @retval true `obj` is a Flonum. * @retval false Anything else. * @see RB_FLOAT_TYPE_P() * @note These days there are Flonums and non-Flonum floats, just like we * once had Fixnum/Bignum back in the old days. */ static inline bool RB_FLONUM_P(VALUE obj) { #if USE_FLONUM return (obj & RUBY_FLONUM_MASK) == RUBY_FLONUM_FLAG; #else return false; #endif } RBIMPL_ATTR_CONST() RBIMPL_ATTR_CONSTEXPR(CXX11) RBIMPL_ATTR_ARTIFICIAL() /** * Checks if the given object is an immediate i.e. an object which has no * corresponding storage inside of the object space. * * @param[in] obj An arbitrary ruby object. * @retval true `obj` is a Flonum. * @retval false Anything else. * @see RB_FLOAT_TYPE_P() * @note The concept of "immediate" is purely C specific. */ static inline bool RB_IMMEDIATE_P(VALUE obj) { return obj & RUBY_IMMEDIATE_MASK; } RBIMPL_ATTR_CONST() RBIMPL_ATTR_CONSTEXPR(CXX11) RBIMPL_ATTR_ARTIFICIAL() /** * Checks if the given object is of enum ::ruby_special_consts. * * @param[in] obj An arbitrary ruby object. * @retval true `obj` is a special constant. * @retval false Anything else. */ static inline bool RB_SPECIAL_CONST_P(VALUE obj) { return RB_IMMEDIATE_P(obj) || ! RB_TEST(obj); } RBIMPL_ATTR_CONST() RBIMPL_ATTR_CONSTEXPR(CXX11) /** * Identical to RB_SPECIAL_CONST_P, except it returns a ::VALUE. * * @param[in] obj An arbitrary ruby object. * @retval RUBY_Qtrue `obj` is a special constant. * @retval RUBY_Qfalse Anything else. * * @internal * * 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 RBIMPL_CAST((VALUE)RUBY_Qfalse) #define RUBY_Qtrue RBIMPL_CAST((VALUE)RUBY_Qtrue) #define RUBY_Qnil RBIMPL_CAST((VALUE)RUBY_Qnil) #define RUBY_Qundef RBIMPL_CAST((VALUE)RUBY_Qundef) /** @endcond */ #endif /* RBIMPL_SPECIAL_CONSTS_H */