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ruby--ruby/include/ruby/internal/core/rdata.h

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#ifndef RBIMPL_RDATA_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_RDATA_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 ::RData.
*/
#include "ruby/internal/config.h"
#ifdef STDC_HEADERS
# include <stddef.h>
#endif
#include "ruby/internal/attr/deprecated.h"
#include "ruby/internal/attr/warning.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/value.h"
#include "ruby/internal/value_type.h"
#include "ruby/defines.h"
/** @cond INTERNAL_MACRO */
#ifdef RUBY_UNTYPED_DATA_WARNING
# /* Take that. */
#elif defined(RUBY_EXPORT)
# define RUBY_UNTYPED_DATA_WARNING 1
#else
# define RUBY_UNTYPED_DATA_WARNING 0
#endif
#define RBIMPL_DATA_FUNC(f) RBIMPL_CAST((void (*)(void *))(f))
#define RBIMPL_ATTRSET_UNTYPED_DATA_FUNC() \
RBIMPL_ATTR_WARNING(("untyped Data is unsafe; use TypedData instead")) \
RBIMPL_ATTR_DEPRECATED(("by TypedData"))
#define RBIMPL_MACRO_SELECT(x, y) x ## y
#define RUBY_MACRO_SELECT(x, y) RBIMPL_MACRO_SELECT(x, y)
/** @endcond */
/**
* Convenient casting macro.
*
* @param obj An object, which is in fact an ::RData.
* @return The passed object casted to ::RData.
*/
#define RDATA(obj) RBIMPL_CAST((struct RData *)(obj))
/**
* Convenient getter macro.
*
* @param obj An object, which is in fact an ::RData.
* @return The passed object's ::RData::data field.
*/
#define DATA_PTR(obj) RDATA(obj)->data
/**
* This is a value you can set to ::RData::dfree. Setting this means the data
* was allocated using ::ruby_xmalloc() (or variants), and shall be freed using
* ::ruby_xfree().
*
* @warning Do not use this if you want to use system malloc, because the
* system and Ruby might or might not share the same malloc
* implementation.
*/
#define RUBY_DEFAULT_FREE RBIMPL_DATA_FUNC(-1)
/**
* This is a value you can set to ::RData::dfree. Setting this means the data
* is managed by someone else, like, statically allocated. Of course you are
* on your own then.
*/
#define RUBY_NEVER_FREE RBIMPL_DATA_FUNC(0)
/**
* @private
*
* @deprecated This macro once was a thing in the old days, but makes no sense
* any longer today. Exists here for backwards compatibility
* only. You can safely forget about it.
*/
#define RUBY_UNTYPED_DATA_FUNC(f) f RBIMPL_ATTRSET_UNTYPED_DATA_FUNC()
/*
#define RUBY_DATA_FUNC(func) ((void (*)(void*))(func))
*/
/**
* This is the type of callbacks registered to ::RData. The argument is the
* `data` field.
*/
typedef void (*RUBY_DATA_FUNC)(void*);
/**
* @deprecated
*
* Old "untyped" user data. It has roughly the same usage as struct
* ::RTypedData, but lacked several features such as support for compaction GC.
* Use of this struct is not recommended any longer. If it is dead necessary,
* please inform the core devs about your usage.
*
* @internal
*
* @shyouhei tried to add RBIMPL_ATTR_DEPRECATED for this type but that yielded
* too many warnings in the core. Maybe we want to retry later... Just add
* deprecated document for now.
*/
struct RData {
/** Basic part, including flags and class. */
struct RBasic basic;
/**
* This function is called when the object is experiencing GC marks. If it
* contains references to other Ruby objects, you need to mark them also.
* Otherwise GC will smash your data.
*
* @see rb_gc_mark()
* @warning This is called during GC runs. Object allocations are
* impossible at that moment (that is why GC runs).
*/
RUBY_DATA_FUNC dmark;
/**
* This function is called when the object is no longer used. You need to
* do whatever necessary to avoid memory leaks.
*
* @warning This is called during GC runs. Object allocations are
* impossible at that moment (that is why GC runs).
*/
RUBY_DATA_FUNC dfree;
/** Pointer to the actual C level struct that you want to wrap. */
void *data;
};
RBIMPL_SYMBOL_EXPORT_BEGIN()
/**
* This is the primitive way to wrap an existing C struct into ::RData.
*
* @param[in] klass Ruby level class of the returning object.
* @param[in] datap Pointer to the target C struct.
* @param[in] dmark Mark function.
* @param[in] dfree Free function.
* @exception rb_eTypeError `klass` is not a class.
* @exception rb_eNoMemError Out of memory.
* @return An allocated object that wraps `datap`.
*/
VALUE rb_data_object_wrap(VALUE klass, void *datap, RUBY_DATA_FUNC dmark, RUBY_DATA_FUNC dfree);
/**
* Identical to rb_data_object_wrap(), except it allocates a new data region
* internally instead of taking an existing one. The allocation is done using
* ruby_calloc(). Hence it makes no sense to pass anything other than
* ::RUBY_DEFAULT_FREE to the last argument.
*
* @param[in] klass Ruby level class of the returning object.
* @param[in] size Requested size of memory to allocate.
* @param[in] dmark Mark function.
* @param[in] dfree Free function.
* @exception rb_eTypeError `klass` is not a class.
* @exception rb_eNoMemError Out of memory.
* @return An allocated object that wraps a new `size` byte region.
*/
VALUE rb_data_object_zalloc(VALUE klass, size_t size, RUBY_DATA_FUNC dmark, RUBY_DATA_FUNC dfree);
/**
* @private
* Documented in include/ruby/internal/globals.h
*/
RUBY_EXTERN VALUE rb_cObject;
RBIMPL_SYMBOL_EXPORT_END()
/**
* Converts sval, a pointer to your struct, into a Ruby object.
*
* @param klass A ruby level class.
* @param mark Mark function.
* @param free Free function.
* @param sval A pointer to your struct.
* @exception rb_eTypeError `klass` is not a class.
* @exception rb_eNoMemError Out of memory.
* @return A created Ruby object.
*/
#define Data_Wrap_Struct(klass, mark, free, sval) \
rb_data_object_wrap( \
(klass), \
(sval), \
RBIMPL_DATA_FUNC(mark), \
RBIMPL_DATA_FUNC(free))
/**
* @private
*
* This is an implementation detail of #Data_Make_Struct. People don't use it
* directly.
*
* @param result Variable name of created Ruby object.
* @param klass Ruby level class of the object.
* @param type Type name of the C struct.
* @param size Size of the C struct.
* @param mark Mark function.
* @param free Free function.
* @param sval Variable name of created C struct.
*/
#define Data_Make_Struct0(result, klass, type, size, mark, free, sval) \
VALUE result = rb_data_object_zalloc( \
(klass), \
(size), \
RBIMPL_DATA_FUNC(mark), \
RBIMPL_DATA_FUNC(free)); \
(sval) = RBIMPL_CAST((type *)DATA_PTR(result)); \
RBIMPL_CAST(/*suppress unused variable warnings*/(void)(sval))
/**
* Identical to #Data_Wrap_Struct, except it allocates a new data region
* internally instead of taking an existing one. The allocation is done using
* ruby_calloc(). Hence it makes no sense to pass anything other than
* ::RUBY_DEFAULT_FREE to the `free` argument.
*
* @param klass Ruby level class of the returning object.
* @param type Type name of the C struct.
* @param mark Mark function.
* @param free Free function.
* @param sval Variable name of created C struct.
* @exception rb_eTypeError `klass` is not a class.
* @exception rb_eNoMemError Out of memory.
* @return A created Ruby object.
*/
#ifdef HAVE_STMT_AND_DECL_IN_EXPR
#define Data_Make_Struct(klass, type, mark, free, sval) \
RB_GNUC_EXTENSION({ \
Data_Make_Struct0( \
data_struct_obj, \
klass, \
type, \
sizeof(type), \
mark, \
free, \
sval); \
data_struct_obj; \
})
#else
#define Data_Make_Struct(klass, type, mark, free, sval) \
rb_data_object_make( \
(klass), \
RBIMPL_DATA_FUNC(mark), \
RBIMPL_DATA_FUNC(free), \
RBIMPL_CAST((void **)&(sval)), \
sizeof(type))
#endif
/**
* Obtains a C struct from inside of a wrapper Ruby object.
*
* @param obj An instance of ::RData.
* @param type Type name of the C struct.
* @param sval Variable name of obtained C struct.
* @return Unwrapped C struct that `obj` holds.
*/
#define Data_Get_Struct(obj, type, sval) \
((sval) = RBIMPL_CAST((type*)rb_data_object_get(obj)))
RBIMPL_ATTRSET_UNTYPED_DATA_FUNC()
/**
* @private
*
* This is an implementation detail of rb_data_object_wrap(). People don't use
* it directly.
*
* @param[in] klass Ruby level class of the returning object.
* @param[in] ptr Pointer to the target C struct.
* @param[in] mark Mark function.
* @param[in] free Free function.
* @exception rb_eTypeError `klass` is not a class.
* @exception rb_eNoMemError Out of memory.
* @return An allocated object that wraps `datap`.
*/
static inline VALUE
rb_data_object_wrap_warning(VALUE klass, void *ptr, RUBY_DATA_FUNC mark, RUBY_DATA_FUNC free)
{
return rb_data_object_wrap(klass, ptr, mark, free);
}
/**
* @private
*
* This is an implementation detail of #Data_Get_Struct. People don't use it
* directly.
*
* @param[in] obj An instance of ::RData.
* @return Unwrapped C struct that `obj` holds.
*/
static inline void *
rb_data_object_get(VALUE obj)
{
Check_Type(obj, RUBY_T_DATA);
return DATA_PTR(obj);
}
RBIMPL_ATTRSET_UNTYPED_DATA_FUNC()
/**
* @private
*
* This is an implementation detail of #Data_Get_Struct. People don't use it
* directly.
*
* @param[in] obj An instance of ::RData.
* @return Unwrapped C struct that `obj` holds.
*/
static inline void *
rb_data_object_get_warning(VALUE obj)
{
return rb_data_object_get(obj);
}
#if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P)
# define rb_data_object_wrap_warning(klass, ptr, mark, free) \
RB_GNUC_EXTENSION( \
__builtin_choose_expr( \
__builtin_constant_p(klass) && !(klass), \
rb_data_object_wrap(klass, ptr, mark, free), \
(rb_data_object_wrap_warning)(klass, ptr, mark, free)))
#endif
/**
* This is an implementation detail of #Data_Make_Struct. People don't use it
* directly.
*
* @param[in] klass Ruby level class of the returning object.
* @param[in] mark_func Mark function.
* @param[in] free_func Free function.
* @param[in] datap Variable of created C struct.
* @param[in] size Requested size of allocation.
* @exception rb_eTypeError `klass` is not a class.
* @exception rb_eNoMemError Out of memory.
* @return A created Ruby object.
* @post `*datap` holds the created C struct.
*/
static inline VALUE
rb_data_object_make(VALUE klass, RUBY_DATA_FUNC mark_func, RUBY_DATA_FUNC free_func, void **datap, size_t size)
{
Data_Make_Struct0(result, klass, void, size, mark_func, free_func, *datap);
return result;
}
RBIMPL_ATTR_DEPRECATED(("by: rb_data_object_wrap"))
/** @deprecated This function was renamed to rb_data_object_wrap(). */
static inline VALUE
rb_data_object_alloc(VALUE klass, void *data, RUBY_DATA_FUNC dmark, RUBY_DATA_FUNC dfree)
{
return rb_data_object_wrap(klass, data, dmark, dfree);
}
/** @cond INTERNAL_MACRO */
#define rb_data_object_wrap_0 rb_data_object_wrap
#define rb_data_object_wrap_1 rb_data_object_wrap_warning
#define rb_data_object_wrap_2 rb_data_object_wrap_ /* Used here vvvv */
#define rb_data_object_wrap RUBY_MACRO_SELECT(rb_data_object_wrap_2, RUBY_UNTYPED_DATA_WARNING)
#define rb_data_object_get_0 rb_data_object_get
#define rb_data_object_get_1 rb_data_object_get_warning
#define rb_data_object_get_2 rb_data_object_get_ /* Used here vvvv */
#define rb_data_object_get RUBY_MACRO_SELECT(rb_data_object_get_2, RUBY_UNTYPED_DATA_WARNING)
#define rb_data_object_make_0 rb_data_object_make
#define rb_data_object_make_1 rb_data_object_make_warning
#define rb_data_object_make_2 rb_data_object_make_ /* Used here vvvv */
#define rb_data_object_make RUBY_MACRO_SELECT(rb_data_object_make_2, RUBY_UNTYPED_DATA_WARNING)
/** @endcond */
#endif /* RBIMPL_RDATA_H */
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