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Edit File : rbasic.h \| Size : 5.26 KB
#ifndef RBIMPL_RBASIC_H /--C++--vi:se ft=cpp:/ #define RBIMPL_RBASIC_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 struct ::RBasic. / #include "ruby/internal/attr/artificial.h" #include "ruby/internal/attr/constexpr.h" #include "ruby/internal/attr/forceinline.h" #include "ruby/internal/attr/noalias.h" #include "ruby/internal/attr/pure.h" #include "ruby/internal/cast.h" #include "ruby/internal/dllexport.h" #include "ruby/internal/special_consts.h" #include "ruby/internal/value.h" #include "ruby/assert.h" /* * Convenient casting macro. * * @param obj Arbitrary Ruby object. * @return The passed object casted to ::RBasic. / #define RBASIC(obj) RBIMPL_CAST((struct RBasic )(obj)) /** @cond INTERNAL_MACRO / #define RBASIC_CLASS RBASIC_CLASS #define RBIMPL_RVALUE_EMBED_LEN_MAX 3 #define RVALUE_EMBED_LEN_MAX RVALUE_EMBED_LEN_MAX #define RBIMPL_EMBED_LEN_MAX_OF(T) \ RBIMPL_CAST((int)(sizeof(VALUE[RBIMPL_RVALUE_EMBED_LEN_MAX]) / (sizeof(T)))) /* @endcond / /* * This is an enum because GDB wants it (rather than a macro). People need not * bother. / enum ruby_rvalue_flags { /* Max possible number of objects that can be embedded. / RVALUE_EMBED_LEN_MAX = RBIMPL_RVALUE_EMBED_LEN_MAX }; /* * Ruby object's base components. All Ruby objects have them in common. / struct RUBY_ALIGNAS(SIZEOF_VALUE) RBasic { /* * Per-object flags. Each Ruby object has its own characteristics apart * from its class. For instance, whether an object is frozen or not is not * controlled by its class. This is where such properties are stored. * * @see enum ::ruby_fl_type * * @note This is ::VALUE rather than an enum for alignment purposes. Back * in the 1990s there were no such thing like `_Alignas` in C. / VALUE flags; /* * Class of an object. Every object has its class. Also, everything is an * object in Ruby. This means classes are also objects. Classes have * their own classes, classes of classes have their classes too, and it * recursively continues forever. * * Also note the `const` qualifier. In Ruby, an object cannot "change" its * class. / const VALUE klass; #ifdef __cplusplus public: RBIMPL_ATTR_CONSTEXPR(CXX11) RBIMPL_ATTR_ARTIFICIAL() RBIMPL_ATTR_FORCEINLINE() RBIMPL_ATTR_NOALIAS() /* * We need to define this explicit constructor because the field `klass` is * const-qualified above, which effectively defines the implicit default * constructor as "deleted" (as of C++11) -- No way but to define one by * ourselves. / RBasic() : flags(RBIMPL_VALUE_NULL), klass(RBIMPL_VALUE_NULL) { } #endif }; RBIMPL_SYMBOL_EXPORT_BEGIN() /* * Make the object invisible from Ruby code. * * It is useful to let Ruby's GC manage your internal data structure -- The * object keeps being managed by GC, but `ObjectSpace.each_object` never yields * the object. * * Note that the object also lose a way to call a method on it. * * @param[out] obj A Ruby object. * @return The passed object. * @post The object is destructively modified to be invisible. * @see rb_obj_reveal / VALUE rb_obj_hide(VALUE obj); /* * Make a hidden object visible again. * * It is the caller's responsibility to pass the right `klass` which `obj` * originally used to belong to. * * @param[out] obj A Ruby object. * @param[in] klass Class of `obj`. * @return Passed `obj`. * @pre `obj` was previously hidden. * @post `obj`'s class is `klass`. * @see rb_obj_hide / VALUE rb_obj_reveal(VALUE obj, VALUE klass); / do not use this API to change klass information / RBIMPL_SYMBOL_EXPORT_END() RBIMPL_ATTR_PURE_UNLESS_DEBUG() RBIMPL_ATTR_ARTIFICIAL() /* * Queries the class of an object. * * @param[in] obj An object. * @return Its class. / static inline VALUE RBASIC_CLASS(VALUE obj) { RBIMPL_ASSERT_OR_ASSUME(! RB_SPECIAL_CONST_P(obj)); return RBASIC(obj)->klass; } #endif / RBIMPL_RBASIC_H */ Back

Edit File : rbasic.h | Size : 5.26 KB

#ifndef RBIMPL_RBASIC_H                              /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_RBASIC_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 struct ::RBasic.
 */
#include "ruby/internal/attr/artificial.h"
#include "ruby/internal/attr/constexpr.h"
#include "ruby/internal/attr/forceinline.h"
#include "ruby/internal/attr/noalias.h"
#include "ruby/internal/attr/pure.h"
#include "ruby/internal/cast.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/special_consts.h"
#include "ruby/internal/value.h"
#include "ruby/assert.h"

/**
 * Convenient casting macro.
 *
 * @param   obj  Arbitrary Ruby object.
 * @return  The passed object casted to ::RBasic.
 */
#define RBASIC(obj)                 RBIMPL_CAST((struct RBasic *)(obj))
/** @cond INTERNAL_MACRO */
#define RBASIC_CLASS                RBASIC_CLASS
#define RBIMPL_RVALUE_EMBED_LEN_MAX 3
#define RVALUE_EMBED_LEN_MAX        RVALUE_EMBED_LEN_MAX
#define RBIMPL_EMBED_LEN_MAX_OF(T) \
    RBIMPL_CAST((int)(sizeof(VALUE[RBIMPL_RVALUE_EMBED_LEN_MAX]) / (sizeof(T))))
/** @endcond */

/**
 * This is an enum because GDB wants it (rather than a macro).  People need not
 * bother.
 */
enum ruby_rvalue_flags {
    /** Max possible number of objects that can be embedded. */
    RVALUE_EMBED_LEN_MAX = RBIMPL_RVALUE_EMBED_LEN_MAX
};

/**
 * Ruby object's base components. All Ruby objects have them in common.
 */
struct
RUBY_ALIGNAS(SIZEOF_VALUE)
RBasic {

/**
     * Per-object flags.   Each Ruby object  has its own  characteristics apart
     * from its class.  For instance, whether an object is frozen or not is not
     * controlled by its class.  This is where such properties are stored.
     *
     * @see enum ::ruby_fl_type
     *
     * @note  This is ::VALUE rather than  an enum for alignment purposes.  Back
     *        in the 1990s there were no such thing like `_Alignas` in C.
     */
    VALUE flags;

/**
     * Class of an object.  Every object has its class.  Also, everything is an
     * object  in Ruby.   This means  classes are  also objects.   Classes have
     * their own classes,  classes  of classes have their classes too,  and  it
     * recursively continues forever.
     *
     * Also note the `const` qualifier.  In Ruby, an object cannot "change" its
     * class.
     */
    const VALUE klass;

#ifdef __cplusplus
  public:
    RBIMPL_ATTR_CONSTEXPR(CXX11)
    RBIMPL_ATTR_ARTIFICIAL()
    RBIMPL_ATTR_FORCEINLINE()
    RBIMPL_ATTR_NOALIAS()
    /**
     * We need to define this explicit constructor because the field `klass` is
     * const-qualified above,  which effectively  defines the  implicit default
     * constructor as "deleted"  (as of C++11) --  No way but to  define one by
     * ourselves.
     */
    RBasic() :
        flags(RBIMPL_VALUE_NULL),
        klass(RBIMPL_VALUE_NULL)
    {
    }
#endif
};

RBIMPL_SYMBOL_EXPORT_BEGIN()
/**
 * Make the object invisible from Ruby code.
 *
 * It is  useful to let  Ruby's GC manage your  internal data structure  -- The
 * object keeps being managed by GC, but `ObjectSpace.each_object` never yields
 * the object.
 *
 * Note that the object also lose a way to call a method on it.
 *
 * @param[out]  obj  A Ruby object.
 * @return      The passed object.
 * @post        The object is destructively modified to be invisible.
 * @see         rb_obj_reveal
 */
VALUE rb_obj_hide(VALUE obj);

/**
 * Make a hidden object visible again.
 *
 * It is  the caller's  responsibility to  pass the  right `klass`  which `obj`
 * originally used to belong to.
 *
 * @param[out]  obj    A Ruby object.
 * @param[in]   klass  Class of `obj`.
 * @return      Passed `obj`.
 * @pre         `obj` was previously hidden.
 * @post        `obj`'s class is `klass`.
 * @see         rb_obj_hide
 */
VALUE rb_obj_reveal(VALUE obj, VALUE klass); /* do not use this API to change klass information */
RBIMPL_SYMBOL_EXPORT_END()

RBIMPL_ATTR_PURE_UNLESS_DEBUG()
RBIMPL_ATTR_ARTIFICIAL()
/**
 * Queries the class of an object.
 *
 * @param[in]  obj  An object.
 * @return     Its class.
 */
static inline VALUE
RBASIC_CLASS(VALUE obj)
{
    RBIMPL_ASSERT_OR_ASSUME(! RB_SPECIAL_CONST_P(obj));
    return RBASIC(obj)->klass;
}

#endif /* RBIMPL_RBASIC_H */

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