#ifndef INTERNAL_CLASS_H /* -*- C -*- */
#define INTERNAL_CLASS_H
/**
 * @file
 * @brief      Internal header for Class.
 * @author     \@shyouhei
 * @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.
 */

struct rb_deprecated_classext_struct {
    char conflict[sizeof(VALUE) * 3];
};

struct rb_subclass_entry;
typedef struct rb_subclass_entry rb_subclass_entry_t;

struct rb_subclass_entry {
    VALUE klass;
    rb_subclass_entry_t *next;
};

struct rb_classext_struct {
    struct st_table *iv_index_tbl;
    struct st_table *iv_tbl;
#if SIZEOF_SERIAL_T == SIZEOF_VALUE /* otherwise m_tbl is in struct RClass */
    struct rb_id_table *m_tbl;
#endif
    struct rb_id_table *const_tbl;
    struct rb_id_table *callable_m_tbl;
    rb_subclass_entry_t *subclasses;
    rb_subclass_entry_t **parent_subclasses;
    /**
     * In the case that this is an `ICLASS`, `module_subclasses` points to the link
     * in the module's `subclasses` list that indicates that the klass has been
     * included. Hopefully that makes sense.
     */
    rb_subclass_entry_t **module_subclasses;
#if SIZEOF_SERIAL_T != SIZEOF_VALUE /* otherwise class_serial is in struct RClass */
    rb_serial_t class_serial;
#endif
    const VALUE origin_;
    const VALUE refined_class;
    rb_alloc_func_t allocator;
    const VALUE includer;
};

typedef struct rb_classext_struct rb_classext_t;

#undef RClass
struct RClass {
    struct RBasic basic;
    VALUE super;
    rb_classext_t *ptr;
#if SIZEOF_SERIAL_T == SIZEOF_VALUE
    /* Class serial is as wide as VALUE.  Place it here. */
    rb_serial_t class_serial;
#else
    /* Class serial does not fit into struct RClass. Place m_tbl instead. */
    struct rb_id_table *m_tbl;
#endif
};

void rb_class_subclass_add(VALUE super, VALUE klass);
void rb_class_remove_from_super_subclasses(VALUE);
int rb_singleton_class_internal_p(VALUE sklass);
/* class.c */
VALUE rb_class_boot(VALUE);
VALUE rb_class_inherited(VALUE, VALUE);
VALUE rb_make_metaclass(VALUE, VALUE);
VALUE rb_include_class_new(VALUE, VALUE);
void rb_class_foreach_subclass(VALUE klass, void (*f)(VALUE, VALUE), VALUE);
void rb_class_detach_subclasses(VALUE);
void rb_class_detach_module_subclasses(VALUE);
void rb_class_remove_from_module_subclasses(VALUE);
VALUE rb_obj_methods(int argc, const VALUE *argv, VALUE obj);
VALUE rb_obj_protected_methods(int argc, const VALUE *argv, VALUE obj);
VALUE rb_obj_private_methods(int argc, const VALUE *argv, VALUE obj);
VALUE rb_obj_public_methods(int argc, const VALUE *argv, VALUE obj);
VALUE rb_special_singleton_class(VALUE);
VALUE rb_singleton_class_clone_and_attach(VALUE obj, VALUE attach);
VALUE rb_singleton_class_get(VALUE obj);

int rb_class_has_methods(VALUE c);
void rb_undef_methods_from(VALUE klass, VALUE super);

#define RCLASS_EXT(c) (RCLASS(c)->ptr)
#define RCLASS_IV_TBL(c) (RCLASS_EXT(c)->iv_tbl)
#define RCLASS_CONST_TBL(c) (RCLASS_EXT(c)->const_tbl)
#if SIZEOF_SERIAL_T == SIZEOF_VALUE
# define RCLASS_M_TBL(c) (RCLASS_EXT(c)->m_tbl)
#else
# define RCLASS_M_TBL(c) (RCLASS(c)->m_tbl)
#endif
#define RCLASS_CALLABLE_M_TBL(c) (RCLASS_EXT(c)->callable_m_tbl)
#define RCLASS_IV_INDEX_TBL(c) (RCLASS_EXT(c)->iv_index_tbl)
#define RCLASS_ORIGIN(c) (RCLASS_EXT(c)->origin_)
#define RCLASS_REFINED_CLASS(c) (RCLASS_EXT(c)->refined_class)
#if SIZEOF_SERIAL_T == SIZEOF_VALUE
# define RCLASS_SERIAL(c) (RCLASS(c)->class_serial)
#else
# define RCLASS_SERIAL(c) (RCLASS_EXT(c)->class_serial)
#endif
#define RCLASS_INCLUDER(c) (RCLASS_EXT(c)->includer)

#define RCLASS_CLONED     FL_USER6
#define RICLASS_IS_ORIGIN FL_USER5
#define RCLASS_REFINED_BY_ANY FL_USER7

static inline void
RCLASS_SET_ORIGIN(VALUE klass, VALUE origin)
{
    RB_OBJ_WRITE(klass, &RCLASS_ORIGIN(klass), origin);
    if (klass != origin) FL_SET(origin, RICLASS_IS_ORIGIN);
}

static inline void
RCLASS_SET_INCLUDER(VALUE iclass, VALUE klass)
{
    RB_OBJ_WRITE(iclass, &RCLASS_INCLUDER(iclass), klass);
}

#undef RCLASS_SUPER
static inline VALUE
RCLASS_SUPER(VALUE klass)
{
    return RCLASS(klass)->super;
}

static inline VALUE
RCLASS_SET_SUPER(VALUE klass, VALUE super)
{
    if (super) {
        rb_class_remove_from_super_subclasses(klass);
        rb_class_subclass_add(super, klass);
    }
    RB_OBJ_WRITE(klass, &RCLASS(klass)->super, super);
    return super;
}

#endif /* INTERNAL_CLASS_H */