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Edit File : robject.h \| Size : 5.04 KB
#ifndef RBIMPL_ROBJECT_H /--C++--vi:se ft=cpp:/ #define RBIMPL_ROBJECT_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 ::RObject. / #include "ruby/internal/config.h" #ifdef HAVE_STDINT_H # include <stdint.h> #endif #include "ruby/internal/attr/artificial.h" #include "ruby/internal/attr/deprecated.h" #include "ruby/internal/attr/pure.h" #include "ruby/internal/cast.h" #include "ruby/internal/fl_type.h" #include "ruby/internal/value.h" #include "ruby/internal/value_type.h" /* * Convenient casting macro. * * @param obj An object, which is in fact an ::RObject. * @return The passed object casted to ::RObject. / #define ROBJECT(obj) RBIMPL_CAST((struct RObject )(obj)) /** @cond INTERNAL_MACRO / #define ROBJECT_EMBED_LEN_MAX ROBJECT_EMBED_LEN_MAX #define ROBJECT_EMBED ROBJECT_EMBED #define ROBJECT_IV_CAPACITY ROBJECT_IV_CAPACITY #define ROBJECT_IVPTR ROBJECT_IVPTR /* @endcond / /* * @private * * Bits that you can set to ::RBasic::flags. / enum ruby_robject_flags { /* * This flag has something to do with memory footprint. If the object is * "small" enough, ruby tries to be creative to abuse padding bits of * struct ::RObject for storing instance variables. This flag denotes that * situation. * * @warning This bit has to be considered read-only. Setting/clearing * this bit without corresponding fix up must cause immediate * SEGV. Also, internal structures of an object change * dynamically and transparently throughout of its lifetime. * Don't assume it being persistent. * * @internal * * 3rd parties must not be aware that there even is more than one way to * store instance variables. Might better be hidden. / ROBJECT_EMBED = RUBY_FL_USER1 }; struct st_table; /* * Ruby's ordinal objects. Unless otherwise special cased, all predefined and * user-defined classes share this struct to hold their instances. / struct RObject { /* Basic part, including flags and class. / struct RBasic basic; /* Object's specific fields. / union { /* * Object that use separated memory region for instance variables use * this pattern. / struct { /* Pointer to a C array that holds instance variables. / VALUE ivptr; /** * This is a table that holds instance variable name to index * mapping. Used when accessing instance variables using names. * * @internal * * This is a shortcut for `RCLASS_IV_INDEX_TBL(rb_obj_class(obj))`. / struct rb_id_table iv_index_tbl; } heap; /* Embedded instance variables. When an object is small enough, it * uses this area to store the instance variables. * * This is a length 1 array because: * 1. GCC has a bug that does not optimize C flexible array members * (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102452) * 2. Zero length arrays are not supported by all compilers / VALUE ary[1]; } as; }; RBIMPL_ATTR_PURE_UNLESS_DEBUG() RBIMPL_ATTR_ARTIFICIAL() /* * Queries the instance variables. * * @param[in] obj Object in question. * @return Its instance variables, in C array. * @pre `obj` must be an instance of ::RObject. * * @internal * * @shyouhei finds no reason for this to be visible from extension libraries. / static inline VALUE ROBJECT_IVPTR(VALUE obj) { RBIMPL_ASSERT_TYPE(obj, RUBY_T_OBJECT); struct RObject const ptr = ROBJECT(obj); if (RB_FL_ANY_RAW(obj, ROBJECT_EMBED)) { return ptr->as.ary; } else { return ptr->as.heap.ivptr; } } #endif / RBIMPL_ROBJECT_H */ Back

Edit File : robject.h | Size : 5.04 KB

#ifndef RBIMPL_ROBJECT_H                             /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_ROBJECT_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 ::RObject.
 */
#include "ruby/internal/config.h"

#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif

#include "ruby/internal/attr/artificial.h"
#include "ruby/internal/attr/deprecated.h"
#include "ruby/internal/attr/pure.h"
#include "ruby/internal/cast.h"
#include "ruby/internal/fl_type.h"
#include "ruby/internal/value.h"
#include "ruby/internal/value_type.h"

/**
 * Convenient casting macro.
 *
 * @param   obj  An object, which is in fact an ::RObject.
 * @return  The passed object casted to ::RObject.
 */
#define ROBJECT(obj)          RBIMPL_CAST((struct RObject *)(obj))
/** @cond INTERNAL_MACRO */
#define ROBJECT_EMBED_LEN_MAX ROBJECT_EMBED_LEN_MAX
#define ROBJECT_EMBED         ROBJECT_EMBED
#define ROBJECT_IV_CAPACITY   ROBJECT_IV_CAPACITY
#define ROBJECT_IVPTR         ROBJECT_IVPTR
/** @endcond */

/**
 * @private
 *
 * Bits that you can set to ::RBasic::flags.
 */
enum ruby_robject_flags {
    /**
     * This flag has  something to do with memory footprint.   If the object is
     * "small"  enough, ruby  tries to  be creative  to abuse  padding bits  of
     * struct ::RObject for storing instance variables.  This flag denotes that
     * situation.
     *
     * @warning  This  bit has  to be  considered read-only.   Setting/clearing
     *           this  bit without  corresponding fix  up must  cause immediate
     *           SEGV.   Also,   internal  structures   of  an   object  change
     *           dynamically  and  transparently  throughout of  its  lifetime.
     *           Don't assume it being persistent.
     *
     * @internal
     *
     * 3rd parties must  not be aware that  there even is more than  one way to
     * store instance variables.  Might better be hidden.
     */
    ROBJECT_EMBED = RUBY_FL_USER1
};

struct st_table;

/**
 * Ruby's ordinal objects.  Unless otherwise  special cased, all predefined and
 * user-defined classes share this struct to hold their instances.
 */
struct RObject {

/** Basic part, including flags and class. */
    struct RBasic basic;

/** Object's specific fields. */
    union {

/**
         * Object that use  separated memory region for  instance variables use
         * this pattern.
         */
        struct {
            /** Pointer to a C array that holds instance variables. */
            VALUE *ivptr;

/**
             * This  is a  table that  holds  instance variable  name to  index
             * mapping.  Used when accessing instance variables using names.
             *
             * @internal
             *
             * This is a shortcut for `RCLASS_IV_INDEX_TBL(rb_obj_class(obj))`.
             */
            struct rb_id_table *iv_index_tbl;
        } heap;

/* Embedded instance variables. When an object is small enough, it
         * uses this area to store the instance variables.
         *
         * This is a length 1 array because:
         *   1. GCC has a bug that does not optimize C flexible array members
         *      (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102452)
         *   2. Zero length arrays are not supported by all compilers
         */
        VALUE ary[1];
    } as;
};

RBIMPL_ATTR_PURE_UNLESS_DEBUG()
RBIMPL_ATTR_ARTIFICIAL()
/**
 * Queries the instance variables.
 *
 * @param[in]  obj  Object in question.
 * @return     Its instance variables, in C array.
 * @pre        `obj` must be an instance of ::RObject.
 *
 * @internal
 *
 * @shyouhei finds no reason for this to be visible from extension libraries.
 */
static inline VALUE *
ROBJECT_IVPTR(VALUE obj)
{
    RBIMPL_ASSERT_TYPE(obj, RUBY_T_OBJECT);

struct RObject *const ptr = ROBJECT(obj);

if (RB_FL_ANY_RAW(obj, ROBJECT_EMBED)) {
        return ptr->as.ary;
    }
    else {
        return ptr->as.heap.ivptr;
    }
}

#endif /* RBIMPL_ROBJECT_H */

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