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#ifndef RBIMPL_NEWOBJ_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_NEWOBJ_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 #NEWOBJ.
*/
#include "ruby/internal/attr/deprecated.h"
#include "ruby/internal/cast.h"
#include "ruby/internal/core/rbasic.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/fl_type.h"
#include "ruby/internal/special_consts.h"
#include "ruby/internal/value.h"
#include "ruby/assert.h"
/**
* Declares, allocates, then assigns a new object to the given variable.
*
* @param obj Variable name.
* @param type Variable type.
* @exception rb_eNoMemError No space left.
* @return An allocated object, not initialised.
* @note Modern programs tend to use #NEWOBJ_OF instead.
*
* @internal
*
* :FIXME: Should we deprecate it?
*/
#define RB_NEWOBJ(obj,type) type *(obj) = RBIMPL_CAST((type *)rb_newobj())
/**
* Identical to #RB_NEWOBJ, except it also accepts the allocating object's
* class and flags.
*
* @param obj Variable name.
* @param type Variable type.
* @param klass Object's class.
* @param flags Object's flags.
* @exception rb_eNoMemError No space left.
* @return An allocated object, filled with the arguments.
*/
#define RB_NEWOBJ_OF(obj,type,klass,flags) type *(obj) = RBIMPL_CAST((type *)rb_newobj_of(klass, flags))
#define NEWOBJ RB_NEWOBJ /**< @old{RB_NEWOBJ} */
#define NEWOBJ_OF RB_NEWOBJ_OF /**< @old{RB_NEWOBJ_OF} */
#define OBJSETUP rb_obj_setup /**< @old{rb_obj_setup} */
#define CLONESETUP rb_clone_setup /**< @old{rb_clone_setup} */
#define DUPSETUP rb_dup_setup /**< @old{rb_dup_setup} */
RBIMPL_SYMBOL_EXPORT_BEGIN()
/**
* This is the implementation detail of #RB_NEWOBJ.
*
* @exception rb_eNoMemError No space left.
* @return An allocated object, not initialised.
*/
VALUE rb_newobj(void);
/**
* This is the implementation detail of #RB_NEWOBJ_OF.
*
* @param klass Object's class.
* @param flags Object's flags.
* @exception rb_eNoMemError No space left.
* @return An allocated object, filled with the arguments.
*/
VALUE rb_newobj_of(VALUE klass, VALUE flags);
/**
* Fills common fields in the object.
*
* @note Prefer rb_newobj_of() to this function.
* @param[in,out] obj A Ruby object to be set up.
* @param[in] klass `obj` will belong to this class.
* @param[in] type One of ::ruby_value_type.
* @return The passed object.
*
* @internal
*
* Historically, authors of Ruby has described the `type` argument as "one of
* ::ruby_value_type". In reality it accepts either ::ruby_value_type,
* ::ruby_fl_type, or any combinations of the two. For instance
* `RUBY_T_STRING | RUBY_FL_FREEZE` is a valid value that this function takes,
* and means this is a frozen string.
*
* 3rd party extension libraries rarely need to allocate Strings this way.
* They normally only concern ::RUBY_T_DATA. This argument is mainly used for
* specifying flags, @shyouhei suspects.
*/
VALUE rb_obj_setup(VALUE obj, VALUE klass, VALUE type);
/**
* Queries the class of an object. This is not always identical to
* `RBASIC_CLASS(obj)`. It searches for the nearest ancestor skipping
* singleton classes or included modules.
*
* @param[in] obj Object in question.
* @return The object's class, in a normal sense.
*/
VALUE rb_obj_class(VALUE obj);
/**
* Clones a singleton class. An object can have its own singleton class. OK.
* Then what happens when a program clones such object? The singleton class
* that is attached to the source object must also be cloned. Otherwise a
* singleton object gets shared with two objects, which breaks "singleton"-ness
* of such class.
*
* This is basically an implementation detail of rb_clone_setup(). People
* need not be aware of this working behind-the-scene.
*
* @param[in] obj The object that has its own singleton class.
* @return Cloned singleton class.
*/
VALUE rb_singleton_class_clone(VALUE obj);
/**
* Attaches a singleton class to its corresponding object.
*
* This is basically an implementation detail of rb_clone_setup(). People
* need not be aware of this working behind-the-scene.
*
* @param[in] klass The singleton class.
* @param[out] obj The object to attach a class.
* @pre The passed two objects must agree with each other that `klass`
* becomes a singleton class of `obj`.
* @post `klass` becomes the singleton class of `obj`.
*/
void rb_singleton_class_attached(VALUE klass, VALUE obj);
/**
* Copies the list of instance variables. 3rd parties need not know, but there
* are several ways to store an object's instance variables, depending on its
* internal structure. This function makes sense when either of the passed
* objects are using so-called "generic" backend storage. This distinction is
* purely an implementation detail of rb_clone_setup(). People need not be
* aware of this working behind-the-scenes.
*
* @param[out] clone The destination object.
* @param[in] obj The source object.
*/
void rb_copy_generic_ivar(VALUE clone, VALUE obj);
RBIMPL_SYMBOL_EXPORT_END()
RBIMPL_ATTR_DEPRECATED(("This is no longer how Object#clone works."))
/**
* @deprecated Not sure exactly when but at some time, the implementation of
* `Object#clone` stopped using this function. It remained
* untouched for a while, and then @shyouhei realised that they
* are no longer doing the same thing. It seems nobody seriously
* uses this function any longer. Let's just abandon it.
*
* @param[out] clone The destination object.
* @param[in] obj The source object.
*/
static inline void
rb_clone_setup(VALUE clone, VALUE obj)
{
(void)clone;
(void)obj;
return;
}
RBIMPL_ATTR_DEPRECATED(("This is no longer how Object#dup works."))
/**
* @deprecated Not sure exactly when but at some time, the implementation of
* `Object#dup` stopped using this function. It remained
* untouched for a while, and then @shyouhei realised that they
* are no longer the same thing. It seems nobody seriously uses
* this function any longer. Let's just abandon it.
*
* @param[out] dup The destination object.
* @param[in] obj The source object.
*/
static inline void
rb_dup_setup(VALUE dup, VALUE obj)
{
(void)dup;
(void)obj;
return;
}
#endif /* RBIMPL_NEWOBJ_H */
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