efl/src/lib/eo/eo_base_class.c

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <Eina.h>
#include <fnmatch.h>

#include <Eo.h>

#include "eo_internal.h"

#include "eo_ptr_indirection.h"
#include "eo_private.h"
#include "eina_promise_private.h"

EO_API const Efl_Event_Description _EFL_EVENT_CALLBACK_ADD =
    EFL_EVENT_DESCRIPTION_HOT("callback,add");

EO_API const Efl_Event_Description _EFL_EVENT_CALLBACK_DEL =
    EFL_EVENT_DESCRIPTION_HOT("callback,del");

static int event_freeze_count = 0;

typedef struct _Eo_Callback_Description  Eo_Callback_Description;
typedef struct _Efl_Event_Callback_Frame Efl_Event_Callback_Frame;
typedef struct _Efl_Event_Forwarder Efl_Event_Forwarder;

struct _Efl_Event_Forwarder
{
   const Efl_Event_Description *desc;
   Eo *source;
   Eo *new_obj;

   short priority;

   Eina_Bool inserted : 1;
};

struct _Efl_Event_Callback_Frame
{
   const Efl_Event_Description    *desc;
   Efl_Event_Callback_Frame *next;
   unsigned int              idx;
   unsigned int              inserted_before;
   unsigned short            generation;
};

typedef struct
{
   const char                *name;
   const char                *comment;
   Eo                        *composite_parent;
   Eina_Inlist               *generic_data;
   Eo                      ***wrefs;
   Eina_Hash                 *providers;
   Eina_Hash                 *schedulers;
   Eina_Hash                 *forwarders;
} Efl_Object_Extension;

#define EFL_OBJECT_EVENT_CALLBACK(Event) Eina_Bool event_cb_##Event : 1;

struct _Efl_Object_Data
{
   Eina_Inlist               *children;
   Eo                        *parent;

   Efl_Object_Extension      *ext;

   Efl_Event_Callback_Frame  *event_frame;
   Eo_Callback_Description  **callbacks;
#ifdef EFL64
   uint64_t                   callbacks_mask;
#else
   uint32_t                   callbacks_mask;
#endif
   Eina_Inlist               *pending_futures;
   unsigned int               callbacks_count;

   unsigned short             event_freeze_count;

   EFL_OBJECT_EVENT_CALLBACK(EFL_EVENT_CALLBACK_ADD);
   EFL_OBJECT_EVENT_CALLBACK(EFL_EVENT_CALLBACK_DEL);
   EFL_OBJECT_EVENT_CALLBACK(EFL_EVENT_DEL);
   EFL_OBJECT_EVENT_CALLBACK(EFL_EVENT_NOREF);

   EFL_OBJECT_EVENT_CALLBACK(EFL_EVENT_INVALIDATE);
   EFL_OBJECT_EVENT_CALLBACK(EFL_EVENT_DESTRUCT); // No proper count: minor optimization triggered at destruction only
   Eina_Bool                  callback_stopped : 1;
   Eina_Bool                  need_cleaning : 1;

   Eina_Bool                  allow_parent_unref : 1; // Allows unref to zero even with a parent
};

typedef enum
{
   DATA_PTR,
   DATA_OBJ,
   DATA_OBJ_WEAK,
   DATA_VAL
} Eo_Generic_Data_Node_Type;

typedef struct
{
   EINA_INLIST;
   const Eo                  *obj;
   Eina_Stringshare          *key;
   union {
        Eina_Value           *val;
        Eo                   *obj;
        void                 *ptr;
   } d;
   Eo_Generic_Data_Node_Type  d_type;
} Eo_Generic_Data_Node;

typedef struct _Efl_Future_Pending
{
   EINA_INLIST;
   const Eo *o;
   Eina_Future *future;
   Efl_Future_Cb_Desc desc;
} Efl_Future_Pending;


typedef struct
{
   EINA_INLIST;
   const Efl_Event_Description *desc;
   unsigned int current;
} Eo_Current_Callback_Description;

#define EVENT_STACK_PUSH(pd, fr) do { \
   (fr)->next = (pd)->event_frame; \
   (pd)->event_frame = (fr); \
} while (0)
#define EVENT_STACK_POP(pd) do { \
   if ((pd)->event_frame) (pd)->event_frame = (pd)->event_frame->next; \
} while (0)

static void _efl_event_forwarder_callback(void *data, const Efl_Event *event);

static int _eo_nostep_alloc = -1;

static void
_efl_pending_futures_clear(Efl_Object_Data *pd)
{
   while (pd->pending_futures)
     {
        Efl_Future_Pending *pending = EINA_INLIST_CONTAINER_GET(pd->pending_futures, Efl_Future_Pending);
        Eina_Future *future = *pending->desc.storage;
        assert(future);
        eina_future_cancel(future);
     }
}

static inline void
_efl_object_extension_free(Efl_Object_Extension *ext)
{
   eina_freeq_ptr_main_add(ext, free, sizeof(*ext));
}

static inline Efl_Object_Extension *
_efl_object_extension_need(Efl_Object_Data *pd)
{
   if (!pd->ext) pd->ext = calloc(1, sizeof(Efl_Object_Extension));
   return pd->ext;
}

static inline void
_efl_object_extension_noneed(Efl_Object_Data *pd)
{
   Efl_Object_Extension *ext = pd->ext;
   if ((!ext) ||
       (ext->name) ||
       (ext->comment) ||
       (ext->generic_data) ||
       (ext->wrefs) ||
       (ext->composite_parent) ||
       (ext->providers) ||
       (ext->schedulers) ||
       (ext->forwarders)) return;
   _efl_object_extension_free(pd->ext);
   pd->ext = NULL;
}

static void
_efl_object_invalidate(Eo *obj_id, Efl_Object_Data *pd)
{
   _efl_pending_futures_clear(pd);

   if (pd->ext && pd->ext->forwarders)
     {
        eina_hash_free(pd->ext->forwarders);
        pd->ext->forwarders = NULL;
        _efl_object_extension_noneed(pd);
     }

   if (pd->ext && pd->ext->providers)
     {
        eina_hash_free(pd->ext->providers);
        pd->ext->providers = NULL;
        _efl_object_extension_noneed(pd);
     }
   if (pd->ext && pd->ext->schedulers)
     {
        eina_hash_free(pd->ext->schedulers);
        pd->ext->schedulers = NULL;
        _efl_object_extension_noneed(pd);
     }

   EO_OBJ_POINTER_RETURN(obj_id, obj);

   // Finally invalidate itself if it wasn't done already
   // I am not sure this is a good idea, but it force the
   // behavior of calling directly efl_invalidate to be the
   // same as efl_parent_set(NULL).
   if (!obj->is_invalidating)
     efl_parent_set(obj_id, NULL);

   EO_OBJ_DONE(obj_id);
}

// Generate the invalidate event in all case and make sure it happens
// before any user code can change the children invalidate state. This
// make sure that the entire tree of object is valid at the time of
// the invalidate event.
void
_efl_invalidate(_Eo_Object *obj)
{
   Eina_Array stash = { 0 };
   Efl_Object_Data *pd;
   _Eo_Object *child;
   Eo *id;

   if (obj->is_invalidating) return ;
   obj->is_invalidating = EINA_TRUE;
   if (obj->invalidate) return;

   id = _eo_obj_id_get(obj);

   pd = efl_data_scope_get(id, EFL_OBJECT_CLASS);
   if (pd->event_cb_EFL_EVENT_INVALIDATE)
     efl_event_callback_call(id, EFL_EVENT_INVALIDATE, NULL);

   efl_invalidate(id);

   eina_array_step_set(&stash, sizeof (stash), 4);

   // Invalidate all children too
   EINA_INLIST_FOREACH(pd->children, child)
     eina_array_push(&stash, _efl_ref(child));

   while ((child = eina_array_pop(&stash)))
     {
        Eo *child_id = _eo_obj_id_get(child);

        efl_parent_set(child_id, NULL);
        _efl_unref(child);
     }

   eina_array_flush(&stash);

   obj->invalidate = EINA_TRUE;
}

static void _key_generic_cb_del(void *data, const Efl_Event *event);

static void
_eo_generic_data_node_free(Eo_Generic_Data_Node *node)
{
   switch (node->d_type)
     {
      case DATA_PTR:
        break;
      case DATA_OBJ:
        // FIXME: should this use "destruct" event instead?
        efl_event_callback_del(node->d.obj, EFL_EVENT_DEL, _key_generic_cb_del, node);
        efl_unref(node->d.obj);
        break;
      case DATA_OBJ_WEAK:
        // FIXME: should this use "destruct" event instead?
        efl_event_callback_del(node->d.obj, EFL_EVENT_DEL, _key_generic_cb_del, node);
        break;
      case DATA_VAL:
        eina_value_free(node->d.val);
        break;
     }
   eina_stringshare_del(node->key);
   eina_freeq_ptr_main_add(node, free, sizeof(*node));
}

static void
_eo_generic_data_del_all(Eo *obj EINA_UNUSED, Efl_Object_Data *pd)
{
   Eo_Generic_Data_Node *node;
   Efl_Object_Extension *ext = pd->ext;

   if (!ext) return;

   while (ext->generic_data)
     {
        node = (Eo_Generic_Data_Node *)ext->generic_data;
        ext->generic_data = eina_inlist_remove(ext->generic_data,
              EINA_INLIST_GET(node));

        _eo_generic_data_node_free(node);
     }
}

static void
_eo_key_generic_direct_del(Efl_Object_Data *pd, Eo_Generic_Data_Node *node, Eina_Bool call_free)
{
   Efl_Object_Extension *ext = pd->ext;

   ext->generic_data = eina_inlist_remove
     (ext->generic_data, EINA_INLIST_GET(node));
   if (call_free) _eo_generic_data_node_free(node);
}

static void
_eo_key_generic_del(const Eo *obj EINA_UNUSED, Efl_Object_Data *pd, const char *key, Eina_Bool call_free)
{
   Eo_Generic_Data_Node *node;
   Efl_Object_Extension *ext = pd->ext;

   EINA_INLIST_FOREACH(ext->generic_data, node)
     {
        if (!strcmp(node->key, key))
          {
             ext->generic_data = eina_inlist_remove
               (ext->generic_data, EINA_INLIST_GET(node));
             if (call_free) _eo_generic_data_node_free(node);
             return;
          }
     }
}

/* Return TRUE if the object was newly added. */
static Eo_Generic_Data_Node *
_key_generic_set(const Eo *obj, Efl_Object_Data *pd, const char *key, const void *data, Eo_Generic_Data_Node_Type d_type, Eina_Bool call_free)
{
   Eo_Generic_Data_Node *node;
   Efl_Object_Extension *ext = pd->ext;

   if (!key) return NULL;
   if (ext)
     {
        if (!data)
          {
             _eo_key_generic_del(obj, pd, key, call_free);
             return NULL;
          }
        EINA_INLIST_FOREACH(ext->generic_data, node)
          {
             if (!strcmp(node->key, key))
               {
                  if ((node->d_type == d_type) && (node->d.ptr == data))
                     return NULL;
                  ext->generic_data = eina_inlist_remove
                    (ext->generic_data, EINA_INLIST_GET(node));
                  _eo_generic_data_node_free(node);
                  break;
               }
          }
     }

   ext = _efl_object_extension_need(pd);
   if (ext)
     {
        node = calloc(1, sizeof(Eo_Generic_Data_Node));
        if (!node) return NULL;
        node->obj = obj;
        node->key = eina_stringshare_add(key);
        node->d.ptr = (void *) data;
        node->d_type = d_type;
        ext->generic_data = eina_inlist_prepend
          (ext->generic_data, EINA_INLIST_GET(node));
        return node;
     }

   return NULL;
}

static void *
_key_generic_get(const Eo *obj, Efl_Object_Data *pd, const char *key, Eo_Generic_Data_Node_Type d_type)
{
   Eo_Generic_Data_Node *node;
   Efl_Object_Extension *ext = pd->ext;

   if (!key) return NULL;
   if (!ext) return NULL;
   EINA_INLIST_FOREACH(ext->generic_data, node)
     {
        if (node->key && !strcmp(node->key, key))
          {
             if (node->d_type == d_type)
               {
                  ext->generic_data = eina_inlist_promote
                    (ext->generic_data, EINA_INLIST_GET(node));
                  return node->d.ptr;
               }
             else
               {
                  ERR("Object %p key '%s' asked for %d but is %d'",
                      obj, key, d_type, node->d_type);
                  return NULL;
               }
          }
     }
   return NULL;
}

static void
_key_generic_cb_del(void *data, const Efl_Event *event EINA_UNUSED)
{
   Eo_Generic_Data_Node *node = data;
   Efl_Object_Data *pd = efl_data_scope_get(node->obj, EFL_OBJECT_CLASS);
   _eo_key_generic_direct_del(pd, node, EINA_TRUE);
}

EOLIAN static void
_efl_object_key_data_set(Eo *obj, Efl_Object_Data *pd, const char *key, const void *data)
{
   _key_generic_set(obj, pd, key, data, DATA_PTR, EINA_TRUE);
}

EO_API EFL_VOID_FUNC_BODYV(efl_key_data_set, EFL_FUNC_CALL(key, data),
                          const char *key, const void *data);

EOLIAN static void *
_efl_object_key_data_get(Eo *obj, Efl_Object_Data *pd, const char *key)
{
   return _key_generic_get(obj, pd, key, DATA_PTR);
}

EO_API EFL_FUNC_BODYV_CONST(efl_key_data_get, void *, NULL, EFL_FUNC_CALL(key),
                           const char *key);

EOLIAN static void
_efl_object_key_ref_set(Eo *obj EINA_UNUSED, Efl_Object_Data *pd, const char *key, const Eo *objdata)
{
   Eo_Generic_Data_Node *node;

   if (!_eo_id_domain_compatible(obj, objdata)) return;
   node = _key_generic_set(obj, pd, key, objdata, DATA_OBJ, EINA_TRUE);
   if (node)
     {
        efl_ref(objdata);
        efl_event_callback_add((Eo *)objdata, EFL_EVENT_DEL, _key_generic_cb_del, node);
     }
}

EO_API EFL_VOID_FUNC_BODYV(efl_key_ref_set, EFL_FUNC_CALL(key, objdata),
                          const char *key, const Efl_Object *objdata);

EOLIAN static Eo *
_efl_object_key_ref_get(Eo *obj, Efl_Object_Data *pd, const char *key)
{
   return _key_generic_get(obj, pd, key, DATA_OBJ);
}

EO_API EFL_FUNC_BODYV_CONST(efl_key_ref_get, Efl_Object *, NULL,
                           EFL_FUNC_CALL(key), const char *key);

EOLIAN static void
_efl_object_key_wref_set(Eo *obj, Efl_Object_Data *pd, const char * key, const Efl_Object *objdata)
{
   Eo_Generic_Data_Node *node;

   if (!_eo_id_domain_compatible(obj, objdata)) return;
   node = _key_generic_set(obj, pd, key, objdata, DATA_OBJ_WEAK, EINA_TRUE);
   if (node)
     {
        efl_event_callback_add((Eo *)objdata, EFL_EVENT_DEL, _key_generic_cb_del, node);
     }
}

EO_API EFL_VOID_FUNC_BODYV(efl_key_wref_set, EFL_FUNC_CALL(key, objdata),
                          const char *key, const Efl_Object *objdata);

EOLIAN static Eo *
_efl_object_key_wref_get(Eo *obj, Efl_Object_Data *pd, const char * key)
{
   return _key_generic_get(obj, pd, key, DATA_OBJ_WEAK);
}

EO_API EFL_FUNC_BODYV_CONST(efl_key_wref_get, Efl_Object *, NULL,
                           EFL_FUNC_CALL(key), const char *key);

EOLIAN static void
_efl_object_key_value_set(Eo *obj EINA_UNUSED, Efl_Object_Data *pd, const char *key, Eina_Value *value)
{
   _key_generic_set(obj, pd, key, value, DATA_VAL, EINA_TRUE);
}

EO_API EFL_VOID_FUNC_BODYV(efl_key_value_set, EFL_FUNC_CALL(key, value),
                          const char *key, Eina_Value *value);

EOLIAN static Eina_Value *
_efl_object_key_value_get(Eo *obj, Efl_Object_Data *pd, const char *key)
{
   return _key_generic_get(obj, pd, key, DATA_VAL);
}

EO_API EFL_FUNC_BODYV_CONST(efl_key_value_get, Eina_Value *, NULL,
                           EFL_FUNC_CALL(key), const char *key);

EOLIAN static void
_efl_object_name_set(Eo *obj EINA_UNUSED, Efl_Object_Data *pd, const char *name)
{
   if ((name) && (!name[0])) name = NULL;
   if (name)
     {
        _efl_object_extension_need(pd);
        if (pd->ext) eina_stringshare_replace(&(pd->ext->name), name);
     }
   else
     {
        if (!pd->ext) return;
        if (pd->ext->name)
          {
             eina_stringshare_replace(&(pd->ext->name), name);
             _efl_object_extension_noneed(pd);
          }
     }
}

EOLIAN static const char *
_efl_object_name_get(const Eo *obj EINA_UNUSED, Efl_Object_Data *pd)
{
   if (!pd->ext) return NULL;
   return pd->ext->name;
}

static inline Eina_Bool
_name_match(const char *match, Eina_Bool is_glob, const char *str)
{
   if (str)
     {
        if (is_glob)
          {
             // if match string is empty - then it matches - same as "*"
             if (!match[0]) return EINA_TRUE;
             // if match string is "*" special case it and match
             if ((match[0] == '*') && (match[1] == 0)) return EINA_TRUE;
             // actual compare
             if (!fnmatch(match, str, 0)) return EINA_TRUE;
          }
        else
          {
             // if match string is empty - then it matches - same as "*"
             if (!match[0]) return EINA_TRUE;
             // if pointers are the same they must be the same
             if (match == str) return EINA_TRUE;
             // actual compare
             if (!strcmp(match, str)) return EINA_TRUE;
          }
     }
   return EINA_FALSE;
}

static inline Eina_Bool
_matchall(const char *match)
{
   if ((match[0] == 0) || ((match[0] == '*') && (match[1] == 0)))
     return EINA_TRUE;
   return EINA_FALSE;
}

static Eina_Bool
_hasglob(const char *match)
{
   if (strpbrk(match, "*?[")) return EINA_TRUE;
   return EINA_FALSE;
}

static Eina_Bool
_ismultiglob(const char *match)
{
   if ((match[0] == '*') && (match[1] == '*') && (match[2] == 0))
     return EINA_TRUE;
   if ((match[0] == '*') && (match[1] == '*') && (match[2] == '/'))
     return EINA_TRUE;
   if ((match[0] == '/') && (match[1] == '*') && (match[2] == '*') && (match[3] == 0))
     return EINA_TRUE;
   if ((match[0] == '/') && (match[1] == '*') && (match[2] == '*') && (match[3] == '/'))
     return EINA_TRUE;
   return EINA_FALSE;
}

EOLIAN static Efl_Object *
_efl_object_name_find(const Eo *obj EINA_UNUSED, Efl_Object_Data *pd, const char *search)
{
   Eo *child;
   _Eo_Object *child_eo;
   const char *name, *p, *klass_name;

   // notes:
   // if search contains NO "/" char, then its just a name search.
   // if there is one or more "/" chars, then these are explicitly object
   // delimiters.
   // a name of "**" means 0 or more objects in the heirachy chain
   // if the string has no "/" char at the start, it implies "/**/"
   // a name can be a name or the form "class:name" where the object must
   // be of class named "class" and name "name". if "name" is empty like:
   // "class:" then an object of any name will match like "class:*". an
   // empty class like ":name" is the sanme as "*:name" which is the same
   // as "name". class ane name of course can be basic globs but not **

   // search string NULL or "" is invalid
   if (!search) return NULL;
   if (!search[0]) return NULL;

   if (strchr(search, '/'))
     {
        ERR("Looking up object by path '%s' is not supported", search);
        return NULL;
     }
   else
     {
        // if this is a multi glob - "**" then we don't have a name or
        // class to match at all so just don't look
        if (_ismultiglob(search)) return NULL;
        // check if this is "class:name" or just "name"
        if ((p = strchr(search, ':')))
          {
             // "class:name"
             char *klass;
             char *search_name;
             size_t colon_location = p - search;
             Eina_Bool klass_glob = EINA_FALSE;
             Eina_Bool name_glob = EINA_FALSE;

             // split class:name into 2 strings dropping :
             klass = alloca(strlen(search) + 1);
             strcpy(klass, search);
             klass[colon_location] = '\0';
             search_name = klass + colon_location + 1;

             // figure out if class or name are globs
             klass_glob = _hasglob(klass);
             name_glob = _hasglob(search_name);
             EINA_INLIST_FOREACH(pd->children, child_eo)
               {
                  child = _eo_obj_id_get(child_eo);
                  name = efl_name_get(child);
                  klass_name = efl_class_name_get(efl_class_get(child));
                  if (_name_match(klass, klass_glob, klass_name) &&
                      (((!_matchall(klass)) && (!name) && (_matchall(search_name))) ||
                       ((name) && _name_match(search_name, name_glob, name))))
                    return child;
                  child = efl_name_find(child, search);
                  if (child) return child;
               }
          }
        else
          {
             if (_hasglob(search))
               {
                  // we have a glob - fnmatch
                  EINA_INLIST_FOREACH(pd->children, child_eo)
                    {
                       child = _eo_obj_id_get(child_eo);
                       name = efl_name_get(child);
                       if ((name) && (_name_match(search, EINA_TRUE, name)))
                         return child;
                       child = efl_name_find(child, search);
                       if (child) return child;
                    }
               }
             else
               {
                  // fast path for simple "name"
                  EINA_INLIST_FOREACH(pd->children, child_eo)
                    {
                       child = _eo_obj_id_get(child_eo);
                       name = efl_name_get(child);
                       if ((name) && (_name_match(search, EINA_FALSE, name)))
                         return child;
                       child = efl_name_find(child, search);
                       if (child) return child;
                    }
               }
          }
     }
   return NULL;
}

EOLIAN static void
_efl_object_comment_set(Eo *obj EINA_UNUSED, Efl_Object_Data *pd, const char *comment)
{
   if ((comment) && (!comment[0])) comment = NULL;
   if (comment)
     {
        _efl_object_extension_need(pd);
        if (pd->ext) eina_stringshare_replace(&(pd->ext->comment), comment);
     }
   else
     {
        if (!pd->ext) return;
        if (pd->ext->comment)
          {
             eina_stringshare_replace(&(pd->ext->comment), comment);
             _efl_object_extension_noneed(pd);
          }
     }
}

EOLIAN static const char *
_efl_object_comment_get(const Eo *obj EINA_UNUSED, Efl_Object_Data *pd)
{
   if (!pd->ext) return NULL;
   return pd->ext->comment;
}

EOLIAN static void
_efl_object_debug_name_override(Eo *obj_id EINA_UNUSED, Efl_Object_Data *pd EINA_UNUSED, Eina_Strbuf *sb EINA_UNUSED)
{
}

EO_API void
efl_del(const Eo *obj)
{
   if (!obj) return ;
   EO_OBJ_POINTER_RETURN(obj, oid);
   _efl_ref(oid);
   if (efl_parent_get((Eo *) obj))
     {
        efl_parent_set((Eo *) obj, NULL);
     }
   else
     {
        ERR("Calling efl_del on object %s with no parent is not advised any more.", efl_debug_name_get(obj));
        efl_unref(obj);
     }
   _efl_unref(oid);
   EO_OBJ_DONE(obj);
}

void
_efl_object_reuse(_Eo_Object *obj)
{
   obj->is_invalidating = EINA_FALSE;
   obj->invalidate = EINA_FALSE;
}

EOLIAN void
_efl_object_parent_set(Eo *obj, Efl_Object_Data *pd, Eo *parent_id)
{
   Eo *prev_parent = pd->parent;
   Eina_Bool bad_parent = EINA_FALSE;

   if ((pd->parent == parent_id) ||
       ((parent_id) && (!_eo_id_domain_compatible(parent_id, obj))))
     return;

   if (parent_id != NULL)
     {
        EO_OBJ_POINTER_GOTO(parent_id, parent_obj, err_impossible);
        bad_parent = parent_obj->invalidate || (obj == parent_id);
        EO_OBJ_DONE(parent_id);
     }

   if (bad_parent) goto err_parent;

   EO_OBJ_POINTER_GOTO(obj, eo_obj, err_impossible);

   // Invalidated object can not be bring back to life
   if (eo_obj->invalidate)
     {
        ERR("Call of efl_parent_set(%p, %p) when object of clas '%s' is already invalidated.\n", obj, parent_id, efl_class_name_get(obj));
        goto err_impossible;
     }

   if (!parent_id)
     {
        if (prev_parent) _efl_invalidate(eo_obj);
     }

   if (pd->parent)
     {
        Efl_Object_Data *old_parent_pd = efl_data_scope_get(pd->parent,
                                                            EFL_OBJECT_CLASS);

        if (old_parent_pd)
          old_parent_pd->children = eina_inlist_remove(old_parent_pd->children,
                                                       EINA_INLIST_GET(eo_obj));
        // this error is highly unlikely so move it out of the normal
        // instruction path to avoid l1 cache pollution
        else goto err_impossible;
     }

   /* Set new parent */
   if (parent_id)
     {
        Efl_Object_Data *parent_pd = efl_data_scope_get(parent_id,
                                                        EFL_OBJECT_CLASS);

        if (EINA_LIKELY(parent_pd != NULL))
          {
             pd->parent = parent_id;
             parent_pd->children = eina_inlist_append(parent_pd->children,
                                                      EINA_INLIST_GET(eo_obj));
             if (!prev_parent) efl_ref(obj);
          }
        else
          {
             pd->parent = NULL;
             if (prev_parent) efl_unref(obj);
             // unlikely this error happens, so move it out of execution path
             // to improve l1 cache efficiency
             goto err_parent_done;
          }

        eo_obj->parent = EINA_TRUE;
     }
   else
     {
        pd->parent = NULL;
        eo_obj->parent = EINA_FALSE;

        if (prev_parent && !eo_obj->del_triggered) efl_unref(obj);
     }

   EO_OBJ_DONE(obj);
   return;

err_parent_done:
   EO_OBJ_DONE(obj);
err_parent:
   if (obj == parent_id)
     ERR("New parent %p for object %p will not be set: THIS IS THE SAME OBJECT.",
         parent_id, obj);
   else
     ERR("New parent %p for object %p is not a valid Eo object.",
         parent_id, obj);
   return;

err_impossible:
   ERR("CONTACT DEVS!!! SHOULD NEVER HAPPEN!!! Old parent %p for object %p is not a valid Eo object.",
       pd->parent, obj);
}

EOLIAN static Eo *
_efl_object_parent_get(const Eo *obj EINA_UNUSED, Efl_Object_Data *pd)
{
   return pd->parent;
}

EOLIAN static Eina_Bool
_efl_object_finalized_get(const Eo *obj_id, Efl_Object_Data *pd EINA_UNUSED)
{
   Eina_Bool finalized;
   EO_OBJ_POINTER_RETURN_VAL(obj_id, obj, EINA_FALSE);
   finalized = obj->finalized;
   EO_OBJ_DONE(obj_id);
   return finalized;
}

EOLIAN static Eina_Bool
_efl_object_invalidated_get(const Eo *obj_id, Efl_Object_Data *pd)
{
   Eina_Bool invalidate;
   EO_OBJ_POINTER_RETURN_VAL(obj_id, obj, EINA_TRUE);
   invalidate = obj->invalidate;
   EO_OBJ_DONE(obj_id);
   if (!invalidate && pd && pd->parent)
     return efl_invalidated_get(pd->parent);
   return invalidate;
}

EOLIAN static Eina_Bool
_efl_object_invalidating_get(const Eo *obj_id, Efl_Object_Data *pd EINA_UNUSED)
{
   Eina_Bool invalidating;
   EO_OBJ_POINTER_RETURN_VAL(obj_id, obj, EINA_TRUE);
   invalidating = obj->is_invalidating;
   EO_OBJ_DONE(obj_id);
   return invalidating;
}

EOLIAN static Efl_Object *
_efl_object_provider_find(const Eo *obj, Efl_Object_Data *pd, const Efl_Object *klass)
{
   Eina_Bool invalidate;
   Efl_Object *r = NULL;

   invalidate = _efl_object_invalidated_get((Eo*) obj, NULL);
   if (invalidate)
     {
        ERR("Calling efl_provider_find(%p) after the object was invalidated.", obj);
        return NULL;
     }

   if (efl_isa(obj, klass)) return (Eo *) obj;

   if (pd->ext) r = eina_hash_find(pd->ext->providers, &klass);
   if (r) return r;

   if (pd->parent) return efl_provider_find(pd->parent, klass);
   return NULL;
}

static Eina_Bool
_efl_object_provider_register(Eo *obj EINA_UNUSED, Efl_Object_Data *pd, const Efl_Class *klass, const Efl_Object *provider)
{
   // The passed object does not provide that said class.
   if (!efl_isa(provider, klass)) return EINA_FALSE;

   _efl_object_extension_need(pd);
   if (!pd->ext) return EINA_FALSE;
   if (!pd->ext->providers) pd->ext->providers = eina_hash_pointer_new(EINA_FREE_CB(efl_unref));

   // Prevent double insertion for the same class
   if (eina_hash_find(pd->ext->providers, &klass)) return EINA_FALSE;

   // Note: I would prefer to use efl_xref here, but I can't figure a nice way to
   // call efl_xunref on hash destruction.
   return eina_hash_add(pd->ext->providers, &klass, efl_ref(provider));
}

static Eina_Bool
_efl_object_provider_unregister(Eo *obj EINA_UNUSED, Efl_Object_Data *pd, const Efl_Class *klass, const Efl_Object *provider)
{
   Eina_Bool r;

   if (!pd->ext) return EINA_FALSE;
   r = eina_hash_del(pd->ext->providers, &klass, provider);

   if (eina_hash_population(pd->ext->providers) != 0) return r;
   eina_hash_free(pd->ext->providers);
   pd->ext->providers = NULL;
   _efl_object_extension_noneed(pd);

   return r;
}

/* Children accessor */
typedef struct _Eo_Children_Iterator Eo_Children_Iterator;
struct _Eo_Children_Iterator
{
   Eina_Iterator iterator;
   Eina_Inlist *current;
   _Eo_Object *obj;
   Eo *obj_id;
};

static Eina_Bool
_efl_children_iterator_next(Eo_Children_Iterator *it, void **data)
{
   if (!it->current) return EINA_FALSE;

   if (data)
     {
        _Eo_Object *eo_obj = EINA_INLIST_CONTAINER_GET(it->current, _Eo_Object);
        *data = _eo_obj_id_get(eo_obj);
     }
   it->current = it->current->next;

   return EINA_TRUE;
}

static Eo *
_efl_children_iterator_container(Eo_Children_Iterator *it)
{
   return it->obj_id;
}

static void
_efl_children_iterator_free(Eo_Children_Iterator *it)
{
   _Efl_Class *klass;
   _Eo_Object *obj;

   klass = (_Efl_Class*) it->obj->klass;
   obj = it->obj;

   eina_spinlock_take(&klass->iterators.trash_lock);
   if (klass->iterators.trash_count < 8)
     {
        klass->iterators.trash_count++;
        eina_trash_push(&klass->iterators.trash, it);
     }
   else
     {
        eina_freeq_ptr_main_add(it, free, sizeof(*it));
     }
   eina_spinlock_release(&klass->iterators.trash_lock);

   _efl_unref(obj);
}

EOLIAN static Eina_Iterator *
_efl_object_children_iterator_new(Eo *obj_id, Efl_Object_Data *pd)
{
   _Efl_Class *klass;
   Eo_Children_Iterator *it = NULL;

   EO_OBJ_POINTER_RETURN_VAL(obj_id, obj, NULL);

   if (pd->children)
     {
        klass = (_Efl_Class *)obj->klass;

        eina_spinlock_take(&klass->iterators.trash_lock);
        it = eina_trash_pop(&klass->iterators.trash);
        if (it)
          {
             klass->iterators.trash_count--;
             memset(it, 0, sizeof (Eo_Children_Iterator));
          }
        else it = calloc(1, sizeof (Eo_Children_Iterator));
        eina_spinlock_release(&klass->iterators.trash_lock);
        // very unlikely to not allocate the iterator to move this error
        // handling out of l1 instruction cache
        if (!it) goto done;

        EINA_MAGIC_SET(&it->iterator, EINA_MAGIC_ITERATOR);
        it->current = pd->children;
        it->obj = _efl_ref(obj);
        it->obj_id = obj_id;
        it->iterator.next = FUNC_ITERATOR_NEXT(_efl_children_iterator_next);
        it->iterator.get_container = FUNC_ITERATOR_GET_CONTAINER(_efl_children_iterator_container);
        it->iterator.free = FUNC_ITERATOR_FREE(_efl_children_iterator_free);
     }
done:
   EO_OBJ_DONE(obj_id);
   return (Eina_Iterator *)it;
}

EOLIAN static void
_efl_object_dbg_info_get(Eo *obj EINA_UNUSED, Efl_Object_Data *pd EINA_UNUSED, Efl_Dbg_Info *root_node EINA_UNUSED)
{  /* No info required in the meantime */
   return;
}

EO_API EFL_VOID_FUNC_BODYV(efl_dbg_info_get, EFL_FUNC_CALL(root_node), Efl_Dbg_Info *root_node);

/* Weak reference. */

static inline size_t
_wref_count(Efl_Object_Data *pd)
{
   Eo ***itr;
   size_t count = 0;
   Efl_Object_Extension *ext = pd->ext;

   if ((!ext) || (!ext->wrefs)) return 0;
   for (itr = ext->wrefs; *itr; itr++) count++;

   return count;
}

EOLIAN static void
_efl_object_wref_add(Eo *obj, Efl_Object_Data *pd, Eo **wref)
{
   size_t count;
   Eo ***tmp;
   Efl_Object_Extension *ext;

   count = _wref_count(pd);
   count += 1; /* New wref. */

   ext = _efl_object_extension_need(pd);
   if (ext)
     {
        tmp = realloc(ext->wrefs, sizeof(*ext->wrefs) * (count + 1));
        if (tmp)
          {
             ext->wrefs = tmp;
             ext->wrefs[count - 1] = wref;
             ext->wrefs[count] = NULL;
             *wref = obj;
          }
     }
}

EO_API EFL_VOID_FUNC_BODYV(efl_wref_add, EFL_FUNC_CALL(wref), Efl_Object **wref);

EOLIAN static void
_efl_object_wref_del(Eo *obj, Efl_Object_Data *pd, Eo **wref)
{
   size_t count;
   Efl_Object_Extension *ext = pd->ext;

   // very unlikely so improve l1 instr cache by using goto
   if (*wref != obj) goto err_wref_not_obj;

   // very unlikely so improve l1 instr cache by using goto
   if ((!ext) || (!ext->wrefs)) goto err_wref_none;

   /* Move the last item in the array instead of the current wref. */
   count = _wref_count(pd);

     {
        Eo ***itr;
        for (itr = ext->wrefs; *itr; itr++)
          {
             if (*itr == wref)
               {
                  *itr = ext->wrefs[count - 1];
                  break;
               }
          }
        // very unlikely so improve l1 instr cache by using goto
        if (!*itr) goto err_noiter;
     }

   if (count > 1)
     {
        Eo ***tmp;
        // No count--; because of the NULL that is not included in the count
        tmp = realloc(ext->wrefs, sizeof(*ext->wrefs) * count);
        if (!tmp) return;
        ext->wrefs = tmp;
        ext->wrefs[count - 1] = NULL;
        *wref = NULL;
        return;
     }
   else
     {
        eina_freeq_ptr_main_add(ext->wrefs, free, 0);
        ext->wrefs = NULL;
        _efl_object_extension_noneed(pd);
     }

   *wref = NULL;
   return;

err_noiter:
   ERR("Wref %p is not associated with object %p", wref, obj);
   goto err_null;
err_wref_none:
   ERR("There are no weak refs for object %p", obj);
err_null:
   *wref = NULL;
   return;
err_wref_not_obj:
   ERR("Wref is a weak ref to %p, while this function was called on %p.",
       *wref, obj);
   return;
}

EO_API EFL_VOID_FUNC_BODYV(efl_wref_del, EFL_FUNC_CALL(wref), Efl_Object **wref);

static inline void
_wref_destruct(Efl_Object_Data *pd)
{
   Eo ***itr;
   Efl_Object_Extension *ext = pd->ext;

   if ((!ext) || (!ext->wrefs)) return;
   for (itr = ext->wrefs; *itr; itr++) **itr = NULL;
   eina_freeq_ptr_main_add(ext->wrefs, free, 0);
   ext->wrefs = NULL;
}

/* EOF Weak reference. */

/* Event callbacks */

/* Callbacks */

/* XXX: Legacy support, remove when legacy is dead. */
static Eina_Hash *_legacy_events_hash = NULL;

EO_API const Efl_Event_Description *
efl_object_legacy_only_event_description_get(const char *_event_name)
{
   Eina_Stringshare *event_name = eina_stringshare_add(_event_name);
   Efl_Event_Description *event_desc = eina_hash_find(_legacy_events_hash, event_name);
   if (!event_desc)
     {
        event_desc = calloc(1, sizeof(Efl_Event_Description));
        event_desc->name = event_name;
        event_desc->legacy_is = EINA_TRUE;
        event_desc->unfreezable = EINA_TRUE;
        eina_hash_add(_legacy_events_hash, event_name, event_desc);
     }
   else
     {
        eina_stringshare_del(event_name);
     }

   return event_desc;
}

static inline Eina_Bool
_legacy_event_desc_is(const Efl_Event_Description *desc)
{
   return desc->legacy_is;
}

static void
_legacy_events_hash_free_cb(void *_desc)
{
   Efl_Event_Description *desc = _desc;
   eina_stringshare_del(desc->name);
   eina_freeq_ptr_main_add(desc, free, sizeof(*desc));
}

/* EOF Legacy */
struct _Eo_Callback_Description
{
   union
     {
        Efl_Callback_Array_Item item;
        const Efl_Callback_Array_Item *item_array;
     } items;

   void *func_data;
   Efl_Callback_Priority priority;

   unsigned short generation;

   Eina_Bool delete_me : 1;
   Eina_Bool func_array : 1;
};

static Eina_Mempool *_eo_callback_mempool = NULL;
static Eina_Mempool *_efl_pending_future_mempool = NULL;
static Eina_Mempool *_efl_future_scheduler_entry_mempool = NULL;

static void
_eo_callback_free(Eo_Callback_Description *cb)
{
   eina_mempool_free(_eo_callback_mempool, cb);
}

static Eo_Callback_Description *
_eo_callback_new(void)
{
   return eina_mempool_calloc(_eo_callback_mempool,
                              sizeof(Eo_Callback_Description));
}

static void
_efl_pending_future_free(Efl_Future_Pending *pending)
{
   eina_mempool_free(_efl_pending_future_mempool, pending);
}

static Efl_Future_Pending *
_efl_pending_future_new(void)
{
   return eina_mempool_calloc(_efl_pending_future_mempool,
                              sizeof(Efl_Future_Pending));
}

#define CB_COUNT_INC(cnt) do { if ((cnt) != 0xffff) (cnt)++; } while(0)
#define CB_COUNT_DEC(cnt) do { if ((cnt) != 0xffff) (cnt)--; } while(0)

static inline unsigned char
_pointer_hash(const uintptr_t val)
{
   static unsigned char shift = 0;

   /* Sadly LLVM doesn't have log2 in its compile time optimization. So
      we can not use static const here for portability sake. */
   if (EINA_UNLIKELY((!shift)))
     shift = (unsigned char) log2(1 + sizeof (Efl_Event_Description));
#ifdef EFL64
   return (unsigned char)(((val) >> shift) & 0x3F);
#else
   return (unsigned char)(((val) >> shift) & 0x1F);
#endif
}

#define EFL_OBJECT_EVENT_CB_INC(Obj, It, Pd, Event, Update_Hash)        \
  if (It->desc == Event && !Pd->event_cb_##Event)                       \
    {                                                                   \
       Update_Hash = EINA_FALSE;                                        \
       Pd->event_cb_##Event = EINA_TRUE;                                \
    }

#define EFL_OBJECT_EVENT_CB_DEC(Obj, It, Pd, Event)     \
  if (It->desc == Event && Pd->event_cb_##Event)        \
    {                                                   \
       if (!efl_event_callback_count(Obj, Event))       \
         Pd->event_cb_##Event = EINA_FALSE;             \
    }

static inline void
_special_event_count_inc(Eo *obj_id, Efl_Object_Data *pd, const Efl_Callback_Array_Item *it)
{
   Eina_Bool update_hash = EINA_TRUE;

   EFL_OBJECT_EVENT_CB_INC(obj_id, it, pd, EFL_EVENT_CALLBACK_ADD, update_hash)
   else EFL_OBJECT_EVENT_CB_INC(obj_id, it, pd, EFL_EVENT_CALLBACK_DEL, update_hash)
   else EFL_OBJECT_EVENT_CB_INC(obj_id, it, pd, EFL_EVENT_DEL, update_hash)
   else EFL_OBJECT_EVENT_CB_INC(obj_id, it, pd, EFL_EVENT_INVALIDATE, update_hash)
   else EFL_OBJECT_EVENT_CB_INC(obj_id, it, pd, EFL_EVENT_DESTRUCT, update_hash)
   else if (it->desc == EFL_EVENT_NOREF && !pd->event_cb_EFL_EVENT_NOREF)
     {
        update_hash = EINA_FALSE;
        EO_OBJ_POINTER_RETURN(obj_id, obj);
        obj->noref_event = EINA_TRUE;
        EO_OBJ_DONE(obj_id);
        pd->event_cb_EFL_EVENT_NOREF = EINA_TRUE;
     }
   else if (it->desc == EFL_EVENT_OWNERSHIP_SHARED || it->desc == EFL_EVENT_OWNERSHIP_UNIQUE)
     {
        EO_OBJ_POINTER_RETURN(obj_id, obj);
        obj->ownership_track = EINA_TRUE;
        EO_OBJ_DONE(obj_id);
     }

   if (pd->ext && pd->ext->forwarders)
     {
        Efl_Event_Forwarder *forwarder;
        Eina_List *l;

        // Check if some event need to be forwarded now
        EINA_LIST_FOREACH(eina_hash_find(pd->ext->forwarders, it->desc), l, forwarder)
          {
             if (!forwarder->source) continue;
             if (forwarder->inserted) continue;
             efl_event_callback_priority_add(forwarder->source,
                                             forwarder->desc,
                                             forwarder->priority,
                                             _efl_event_forwarder_callback, obj_id);
             forwarder->inserted = EINA_TRUE;
          }
     }

   if (update_hash)
     {
        unsigned char event_hash;

        event_hash = _pointer_hash((uintptr_t) it->desc);

        pd->callbacks_mask |= 1ULL << event_hash;
     }
}

static inline void
_special_event_count_dec(Eo *obj_id, Efl_Object_Data *pd, const Efl_Callback_Array_Item *it)
{
   EFL_OBJECT_EVENT_CB_DEC(obj_id, it, pd, EFL_EVENT_CALLBACK_ADD)
   else EFL_OBJECT_EVENT_CB_DEC(obj_id, it, pd, EFL_EVENT_CALLBACK_DEL)
   else EFL_OBJECT_EVENT_CB_DEC(obj_id, it, pd, EFL_EVENT_DEL)
   else EFL_OBJECT_EVENT_CB_DEC(obj_id, it, pd, EFL_EVENT_INVALIDATE)
   else if (it->desc == EFL_EVENT_NOREF && pd->event_cb_EFL_EVENT_NOREF)
     {
        if (efl_event_callback_count(obj_id, EFL_EVENT_NOREF) == 0)
          {
             EO_OBJ_POINTER_RETURN(obj_id, obj);
             obj->noref_event = EINA_FALSE;
             EO_OBJ_DONE(obj_id);

             pd->event_cb_EFL_EVENT_NOREF = EINA_FALSE;
          }
     }
}

/* Actually remove, doesn't care about walking list, or delete_me */
static void
_eo_callback_remove(Eo *obj, Efl_Object_Data *pd, Eo_Callback_Description **cb)
{
   Eo_Callback_Description *tmp = *cb;
   unsigned int length;
   const Efl_Callback_Array_Item *it;

   length = pd->callbacks_count - (cb - pd->callbacks);
   if (length > 1)
     memmove(cb, cb + 1, (length - 1) * sizeof(Eo_Callback_Description *));
   pd->callbacks_count--;

   if (_eo_nostep_alloc) pd->callbacks = realloc(pd->callbacks, pd->callbacks_count * sizeof (Eo_Callback_Description*));

   if (pd->callbacks_count == 0)
     {
        free(pd->callbacks);
        pd->callbacks = NULL;
     }

   if (tmp->func_array)
     {
        for (it = tmp->items.item_array; it->func; it++)
          _special_event_count_dec(obj, pd, it);
     }
   else _special_event_count_dec(obj, pd, &(tmp->items.item));

   _eo_callback_free(tmp);
}

/* Actually remove, doesn't care about walking list, or delete_me */
static void
_eo_callback_remove_all(Efl_Object_Data *pd)
{
   unsigned int i;

   for (i = 0; i < pd->callbacks_count; i++)
     _eo_callback_free(pd->callbacks[i]);

   eina_freeq_ptr_main_add(pd->callbacks, free, 0);
   pd->callbacks = NULL;
   pd->callbacks_count = 0;
   pd->event_cb_EFL_EVENT_DESTRUCT = EINA_FALSE;
   pd->event_cb_EFL_EVENT_CALLBACK_ADD = EINA_FALSE;
   pd->event_cb_EFL_EVENT_CALLBACK_DEL = EINA_FALSE;
   pd->event_cb_EFL_EVENT_DEL = EINA_FALSE;
   pd->event_cb_EFL_EVENT_NOREF = EINA_FALSE;
   pd->event_cb_EFL_EVENT_INVALIDATE = EINA_FALSE;
}

static void
_eo_callbacks_clear(Eo *obj, Efl_Object_Data *pd)
{
   Eo_Callback_Description **itr;
   unsigned int i = 0;
   Eina_Bool remove_callbacks;
   unsigned int generation_clamp;

   /* If there are no deletions waiting. */
   if (!pd->need_cleaning) return;


   if (pd->event_frame)
     {
        /* there is still a event emission going on ... do not delete anything! */
        remove_callbacks = EINA_FALSE;
        /* if we are in event subscription we need to clamp the generations at the current frame otherwise we are possiblity not executing that later */
        generation_clamp = pd->event_frame->generation;
     }
   else
     {
        /* no event emission running */
        /* remove deleted callbacks */
        remove_callbacks = EINA_TRUE;
        /* clap to 0 generation */
        generation_clamp = 0;
        /* we dont need to clean later */
        pd->need_cleaning = EINA_FALSE;
     }

   while (i < pd->callbacks_count)
     {
        itr = pd->callbacks + i;
        if (remove_callbacks && (*itr)->delete_me)
          {
             _eo_callback_remove(obj, pd, itr);
          }
        else
          {
             if ((*itr)->generation > generation_clamp)
               (*itr)->generation = generation_clamp;
             i++;
          }
     }
}

static inline unsigned int
_eo_callback_search_sorted_near(const Efl_Object_Data *pd, const Eo_Callback_Description *look)
{
   unsigned int start, last, middle;
   const Eo_Callback_Description *p;
   int cmp;

   if      (pd->callbacks_count == 0) return 0;
   else if (pd->callbacks_count == 1) return 0;

   start = 0;
   last = pd->callbacks_count - 1;
   do
     {
        middle = start + ((last - start) / 2);
        p = pd->callbacks[middle];

        cmp = p->priority - look->priority;
        if      (cmp    == 0) return middle;
        else if (cmp    >  0) start = middle + 1;
        else if (middle >  0) last  = middle - 1;
        else break;
     }
   while (start <= last);
   return middle;
}

static void
_eo_callbacks_sorted_insert(Efl_Object_Data *pd, Eo_Callback_Description *cb)
{
   Eo_Callback_Description **itr;
   unsigned int length, j;
   Efl_Event_Callback_Frame *frame;

   // Do a dichotomic searh
   j = _eo_callback_search_sorted_near(pd, cb);
   // Adjust for both case of length == 0 and when priority is equal.
   while ((j < pd->callbacks_count) &&
          (pd->callbacks[j]->priority >= cb->priority)) j++;

   // Increase the callbacks storage by 16 entries at a time
   if (_eo_nostep_alloc || (pd->callbacks_count & 0xF) == 0x0)
     {
        Eo_Callback_Description **tmp;
        unsigned int new_len = (pd->callbacks_count | 0xF) + 1;

        if (_eo_nostep_alloc) new_len = pd->callbacks_count + 1;

        tmp = realloc(pd->callbacks,
                      new_len * sizeof(Eo_Callback_Description *));
        if (EINA_UNLIKELY(!tmp)) return;
        pd->callbacks = tmp;
     }

   // FIXME: Potential improvement, merge single callback description of the same priority
   // into an array when possible
   itr = pd->callbacks + j;
   length = pd->callbacks_count - j;
   if (length > 0) memmove(itr + 1, itr,
                           length * sizeof(Eo_Callback_Description *));
   *itr = cb;

   pd->callbacks_count++;

   // Update possible event emissions
   for (frame = pd->event_frame; frame; frame = frame->next)
     {
        if ((itr - pd->callbacks) < (ptrdiff_t)frame->idx)
          frame->inserted_before++;
     }
}

static unsigned short
_efl_event_generation(Efl_Object_Data *pd)
{
   if (!pd->event_frame) return 0;

   return ((Efl_Event_Callback_Frame*)pd->event_frame)->generation;
}

EOLIAN static Eina_Bool
_efl_object_event_callback_priority_add(Eo *obj, Efl_Object_Data *pd,
                                        const Efl_Event_Description *desc,
                                        Efl_Callback_Priority priority,
                                        Efl_Event_Cb func,
                                        const void *user_data)
{
   const Efl_Callback_Array_Item_Full arr[] =
     { {desc, priority, func, (void *)user_data}, {NULL, 0, NULL, NULL}};
   Eo_Callback_Description *cb = _eo_callback_new();
#ifdef EO_DEBUG
   unsigned int idx, r = 0, entries = 0;

   for (idx = pd->callbacks_count ; idx > 0; idx--)
     {
        Eo_Callback_Description **cb;

        cb = pd->callbacks + idx - 1;
        if (!(*cb)->func_array)
          {
             if (((*cb)->items.item.desc == desc) &&
                 ((*cb)->items.item.func == func) &&
                 ((*cb)->priority == priority) &&
                 ((*cb)->generation == _efl_event_generation(pd)))
               r++;
          }
        entries++;
     }
   if (r > 1) INF("Object '%s' got %i callback with event '%s' registered.",
                  efl_debug_name_get(obj), r, desc->name);
   if (entries > 10) INF("Object '%s' got %i callbacks.",
                         efl_debug_name_get(obj), entries);
#endif

   // very unlikely so improve l1 instr cache by using goto
   if (EINA_UNLIKELY(!cb || !desc || !func)) goto err;
   cb->items.item.desc = desc;
   cb->items.item.func = func;
   cb->func_data = (void *)user_data;
   cb->priority = priority;
   cb->generation = _efl_event_generation(pd);
   if (cb->generation) pd->need_cleaning = EINA_TRUE;

   _eo_callbacks_sorted_insert(pd, cb);
   _special_event_count_inc(obj, pd, &(cb->items.item));

   if (pd->event_cb_EFL_EVENT_CALLBACK_ADD)
     efl_event_callback_call(obj, EFL_EVENT_CALLBACK_ADD, (void *)arr);

   return EINA_TRUE;

err: EINA_COLD
   ERR("Tried adding callback with invalid values: cb: %p desc: %p func: %p", cb, desc, func);
   _eo_callback_free(cb);
   return EINA_FALSE;
}

EO_API EFL_FUNC_BODYV(efl_event_callback_priority_add,
                     Eina_Bool, 0, EFL_FUNC_CALL(desc, priority, cb, data),
                     const Efl_Event_Description *desc,
                     Efl_Callback_Priority priority,
                     Efl_Event_Cb cb, const void *data);

static void
_efl_object_event_callback_clean(Eo *obj, Efl_Object_Data *pd,
                                 const Efl_Callback_Array_Item_Full *array,
                                 Eo_Callback_Description **cb)
{
   (*cb)->delete_me = EINA_TRUE;
   if (pd->event_frame)
     pd->need_cleaning = EINA_TRUE;
   else
     _eo_callback_remove(obj, pd, cb);
   if (pd->event_cb_EFL_EVENT_CALLBACK_DEL)
     efl_event_callback_call(obj, EFL_EVENT_CALLBACK_DEL, (void *)array);
}

EOLIAN static Eina_Bool
_efl_object_event_callback_del(Eo *obj, Efl_Object_Data *pd,
                               const Efl_Event_Description *desc,
                               Efl_Event_Cb func,
                               const void *user_data)
{
   Eo_Callback_Description **cb;
   unsigned int i;

   for (cb = pd->callbacks, i = 0;
        i < pd->callbacks_count;
        cb++, i++)
     {
        if (!(*cb)->delete_me &&
            ((*cb)->items.item.desc == desc) &&
            ((*cb)->items.item.func == func) &&
            ((*cb)->func_data == user_data))
          {
             const Efl_Callback_Array_Item_Full arr[] =
               { {desc, (*cb)->priority, func, (*cb)->func_data}, {NULL, 0, NULL, NULL}};

             _efl_object_event_callback_clean(obj, pd, arr, cb);
             return EINA_TRUE;
          }
     }

   DBG("Callback of object %p with function %p and data %p not found.", obj, func, user_data);
   return EINA_FALSE;
}

EO_API EFL_FUNC_BODYV(efl_event_callback_del,
                     Eina_Bool, 0, EFL_FUNC_CALL(desc, func, user_data),
                     const Efl_Event_Description *desc,
                     Efl_Event_Cb func, const void *user_data);

EOLIAN static Eina_Bool
_efl_object_event_callback_array_priority_add(Eo *obj, Efl_Object_Data *pd,
                                              const Efl_Callback_Array_Item *array,
                                              Efl_Callback_Priority priority,
                                              const void *user_data)
{
   Eo_Callback_Description *cb = _eo_callback_new();
   const Efl_Callback_Array_Item *it;
   unsigned int num, i;
   Efl_Callback_Array_Item_Full *ev_array;
#ifdef EO_DEBUG
   const Efl_Callback_Array_Item *prev;
   unsigned int idx, r = 0, entries = 0;
#endif

   // very unlikely so improve l1 instr cache by using goto
   if (!cb || !array) goto err;
#ifdef EO_DEBUG
   prev = array;
   for (it = prev + 1; prev->func && it->func; it++, prev++)
     {
        if (efl_callbacks_cmp(prev, it) > 0)
          {
             ERR("Trying to insert a non sorted array callbacks (%p).", array);
             _eo_callback_free(cb);
             return EINA_FALSE;
          }
     }
#endif

   cb->func_data = (void *) user_data;
   cb->priority = priority;
   cb->items.item_array = array;
   cb->func_array = EINA_TRUE;
   cb->generation = _efl_event_generation(pd);
   if (!!cb->generation) pd->need_cleaning = EINA_TRUE;

#ifdef EO_DEBUG
   for (idx = pd->callbacks_count ; idx > 0; idx--)
     {
        Eo_Callback_Description **cb;

        cb = pd->callbacks + idx - 1;
        if ((*cb)->func_array)
          {
             if (((*cb)->items.item_array == array) &&
                 ((*cb)->priority == priority) &&
                 ((*cb)->generation == _efl_event_generation(pd)))
               r++;
          }
        entries++;
     }
   if (r > 1)
     {
        Eina_Strbuf *buf = eina_strbuf_new();
        Eina_Bool first = EINA_TRUE;

        for (it = array; it->func; it++)
          {
             if (first) eina_strbuf_append(buf, it->desc->name);
             else eina_strbuf_append_printf(buf, ", %s", it->desc->name);
             first = EINA_FALSE;
          }
        INF("Object '%s' got %i callback with events array %s registered.",
            efl_debug_name_get(obj), r, eina_strbuf_string_get(buf));
        eina_strbuf_free(buf);
     }
   if (entries > 10) INF("Object '%s' got %i callbacks.",
                         efl_debug_name_get(obj), entries);
#endif

   _eo_callbacks_sorted_insert(pd, cb);
   for (it = cb->items.item_array; it->func; it++)
     _special_event_count_inc(obj, pd, it);

   num = 0;
   for (it = cb->items.item_array; it->func; it++) num++;
   ev_array = alloca((num + 1) * sizeof(Efl_Callback_Array_Item_Full));
   for (i = 0, it = cb->items.item_array; it->func; it++, i++)
     {
        ev_array[i].desc = cb->items.item_array[i].desc;
        ev_array[i].priority = cb->priority;
        ev_array[i].func = cb->items.item_array[i].func;
        ev_array[i].user_data = cb->func_data;
     }
   ev_array[i].desc = NULL;
   ev_array[i].priority = 0;
   ev_array[i].func = NULL;
   ev_array[i].user_data = NULL;
   if (pd->event_cb_EFL_EVENT_CALLBACK_ADD)
     efl_event_callback_call(obj, EFL_EVENT_CALLBACK_ADD, ev_array);

   return EINA_TRUE;

err:
   ERR("Tried adding array of callbacks with invalid values: cb: %p array: %p.", cb, array);
   _eo_callback_free(cb);
   return EINA_FALSE;
}

EO_API EFL_FUNC_BODYV(efl_event_callback_array_priority_add,
                     Eina_Bool, 0, EFL_FUNC_CALL(array, priority, data),
                     const Efl_Callback_Array_Item *array,
                     Efl_Callback_Priority priority, const void *data);

EOLIAN static Eina_Bool
_efl_object_event_callback_array_del(Eo *obj, Efl_Object_Data *pd,
                                     const Efl_Callback_Array_Item *array,
                                     const void *user_data)
{
   Eo_Callback_Description **cb;
   unsigned int j;

   for (cb = pd->callbacks, j = 0;
        j < pd->callbacks_count;
        cb++, j++)
     {
        if (!(*cb)->delete_me &&
            ((*cb)->items.item_array == array) &&
            ((*cb)->func_data == user_data))
          {
             const Efl_Callback_Array_Item *it;
             unsigned int num, i;
             Efl_Callback_Array_Item_Full *ev_array;

             num = 0;
             for (it = (*cb)->items.item_array; it->func; it++) num++;
             ev_array = alloca((num + 1) * sizeof(Efl_Callback_Array_Item_Full));
             for (i = 0, it = (*cb)->items.item_array; it->func; it++, i++)
               {
                  ev_array[i].desc = (*cb)->items.item_array[i].desc;
                  ev_array[i].priority = (*cb)->priority;
                  ev_array[i].func = (*cb)->items.item_array[i].func;
                  ev_array[i].user_data = (*cb)->func_data;
               }
             ev_array[i].desc = NULL;
             ev_array[i].priority = 0;
             ev_array[i].func = NULL;
             ev_array[i].user_data = NULL;
             _efl_object_event_callback_clean(obj, pd, ev_array, cb);
             return EINA_TRUE;
          }
     }

   DBG("Callback of object %p with function array %p and data %p not found.", obj, array, user_data);
   return EINA_FALSE;
}

EO_API EFL_FUNC_BODYV(efl_event_callback_array_del,
                     Eina_Bool, 0, EFL_FUNC_CALL(array, user_data),
                     const Efl_Callback_Array_Item *array,
                     const void *user_data);

typedef struct _Efl_Future_Scheduler Efl_Future_Scheduler;
typedef struct _Efl_Future_Scheduler_Entry Efl_Future_Scheduler_Entry;

struct _Efl_Future_Scheduler
{
   Eina_Future_Scheduler scheduler;

   const Efl_Callback_Array_Item *array;
   const Eo *self;

   Eina_List *futures;

   Eina_Bool listener : 1;
};

struct _Efl_Future_Scheduler_Entry
{
   Eina_Future_Schedule_Entry base;
   Eina_Future_Scheduler_Cb cb;
   Eina_Future *future;
   Eina_Value value;
};

static Eina_Trash *schedulers_trash = NULL;
static unsigned char schedulers_count = 0;

static void
_future_scheduler_cleanup(Efl_Object_Data *pd)
{
   if (eina_hash_population(pd->ext->schedulers)) return ;

   eina_hash_free(pd->ext->schedulers);
   pd->ext->schedulers = NULL;
   _efl_object_extension_noneed(pd);
}

static void
_futures_dispatch_cb(void *data, const Efl_Event *ev EINA_UNUSED)
{
   Efl_Future_Scheduler *sched = data;
   Eina_List *entries = sched->futures;
   Efl_Future_Scheduler_Entry *entry;

   sched->futures = NULL;

   efl_event_callback_array_del((Eo *) sched->self, sched->array, sched);
   sched->listener = EINA_FALSE;

   // Now trigger callbacks
   EINA_LIST_FREE(entries, entry)
     {
        entry->cb(entry->future, entry->value);
        eina_mempool_free(_efl_future_scheduler_entry_mempool, entry);
     }
}

static void
_futures_cancel_cb(void *data)
{
   Efl_Future_Scheduler *sched = data;
   Eina_List *entries = sched->futures;
   Efl_Future_Scheduler_Entry *entry;

   efl_event_callback_array_del((Eo *) sched->self, sched->array, sched);
   sched->listener = EINA_FALSE;
   sched->futures = NULL;

   EINA_LIST_FREE(entries, entry)
     {
        eina_future_cancel(entry->future);
        eina_value_flush(&entry->value);
        eina_mempool_free(_efl_future_scheduler_entry_mempool, entry);
     }

   if (schedulers_count > 8)
     {
        free(sched);
     }
   else
     {
        eina_trash_push(&schedulers_trash, sched);
        schedulers_count++;
     }
}

static Eina_Future_Schedule_Entry *
_efl_event_future_scheduler(Eina_Future_Scheduler *s_sched,
                            Eina_Future_Scheduler_Cb cb,
                            Eina_Future *future,
                            Eina_Value value)
{
   Efl_Future_Scheduler *sched = (Efl_Future_Scheduler *)s_sched;
   Efl_Future_Scheduler_Entry *entry;

   entry = eina_mempool_malloc(_efl_future_scheduler_entry_mempool, sizeof(*entry));
   EINA_SAFETY_ON_NULL_RETURN_VAL(entry, NULL);

   entry->base.scheduler = &sched->scheduler;
   entry->cb = cb;
   entry->future = future;
   entry->value = value;

   if (!sched->listener)
     {
        efl_event_callback_array_add((Eo *) sched->self, sched->array, sched);
        sched->listener = EINA_TRUE;
     }

   sched->futures = eina_list_append(sched->futures, entry);
   return &entry->base;
}

static void
_efl_event_future_recall(Eina_Future_Schedule_Entry *s_entry)
{
   Efl_Future_Scheduler_Entry *entry = (Efl_Future_Scheduler_Entry *)s_entry;
   Efl_Future_Scheduler *sched;
   Eina_List *lookup;

   sched = (Efl_Future_Scheduler *) entry->base.scheduler;

   lookup = eina_list_data_find_list(sched->futures, entry);
   if (!lookup) return;

   sched->futures = eina_list_remove_list(sched->futures, lookup);
   if (!sched->futures)
     {
        Efl_Object_Data *pd = efl_data_scope_get(sched->self, EFL_OBJECT_CLASS);

        _future_scheduler_cleanup(pd);
     }

   eina_value_flush(&entry->value);
   eina_mempool_free(_efl_future_scheduler_entry_mempool, entry);
}

EOLIAN static Eina_Future_Scheduler *
_efl_object_event_future_scheduler_get(const Eo *obj, Efl_Object_Data *pd, Efl_Callback_Array_Item *array)
{
   Efl_Object_Extension *ext;
   Efl_Future_Scheduler *sched;
   unsigned int i;

   if (!array) return NULL;

   ext = _efl_object_extension_need(pd);
   EINA_SAFETY_ON_NULL_RETURN_VAL(ext, NULL);

   // First lookup for an existing scheduler that match the provided array
   if (!ext->schedulers) ext->schedulers = eina_hash_pointer_new(_futures_cancel_cb);
   sched = eina_hash_find(ext->schedulers, &array);
   if (sched) return &sched->scheduler;

   // Define all the callback in the array to point to our internal callback,
   // making the array ready to use.
   for (i = 0; array[i].desc; i++)
     array[i].func = _futures_dispatch_cb;

   if (schedulers_count)
     {
        // Take one out of the trash for faster cycling
        sched = eina_trash_pop(&schedulers_trash);
        schedulers_count--;
     }
   else
     {
        // Need to allocate a new scheduler as none are on standby.
        sched = calloc(1, sizeof (Efl_Future_Scheduler));
     }
   sched->scheduler.schedule = _efl_event_future_scheduler;
   sched->scheduler.recall = _efl_event_future_recall;
   sched->array = array;
   sched->self = obj;

   eina_hash_add(ext->schedulers, &array, sched);

   return &sched->scheduler;
}

EO_API EFL_FUNC_BODYV_CONST(efl_event_future_scheduler_get,
                           Eina_Future_Scheduler *, 0, EFL_FUNC_CALL(array),
                           Efl_Callback_Array_Item *array);

EO_API unsigned int
_efl_object_event_callback_count(const Eo *obj EINA_UNUSED,
                                 Efl_Object_Data *pd,
                                 const Efl_Event_Description *desc)
{
   unsigned int r = 0;
   unsigned int idx;

   for (idx = pd->callbacks_count ; idx > 0; idx--)
     {
        Eo_Callback_Description **cb;

        cb = pd->callbacks + idx - 1;

        if ((*cb)->func_array)
          {
             const Efl_Callback_Array_Item *it;

             for (it = (*cb)->items.item_array; it->func; it++)
               {
                  if (it->desc > desc) break;
                  if (it->desc == desc) r++;
               }
          }
        else
          {
             if ((*cb)->items.item.desc == desc) r++;
          }
     }
   return r;
}

EO_API EFL_FUNC_BODYV_CONST(efl_event_callback_count,
                           unsigned int, 0, EFL_FUNC_CALL(desc),
                           const Efl_Event_Description *desc);

static Eina_Bool
_cb_desc_match(const Efl_Event_Description *a, const Efl_Event_Description *b, Eina_Bool legacy_compare)
{
   /* If one is legacy and the other is not, strcmp. Else, pointer compare. */
   if (!EINA_UNLIKELY(legacy_compare && (_legacy_event_desc_is(a) != _legacy_event_desc_is(b))))
     return (a == b);
   return !strcmp(a->name, b->name);
}

#define EFL_OBJECT_EVENT_CALLBACK_BLOCK(Pd, Desc, Event, Need_Hash)     \
  if (Desc == Event)                                                    \
    {                                                                   \
       if (!(Pd->event_cb_##Event)) return EINA_TRUE;                   \
       Need_Hash = EINA_FALSE;                                          \
    }                                                                   \

static inline Eina_Bool
_event_callback_call(Eo *obj_id, Efl_Object_Data *pd,
                     const Efl_Event_Description *desc,
                     void *event_info,
                     Eina_Bool legacy_compare)
{
   Eo_Callback_Description **cb;
   Efl_Event_Callback_Frame *restart_lookup = NULL; //a pointer to a frame, which is high up the stack, which we use to restore
   Efl_Event ev;
   unsigned int idx;
   Eina_Bool callback_already_stopped, ret;
   Efl_Event_Callback_Frame frame = {
      .desc = desc,
      .next = NULL,
      .idx = 0,
      .inserted_before = 0,
      .generation = 1,
   };
   Eina_Bool need_hash = EINA_TRUE;

   if (pd->callbacks_count == 0) return EINA_TRUE;
   else EFL_OBJECT_EVENT_CALLBACK_BLOCK(pd, desc, EFL_EVENT_CALLBACK_ADD, need_hash)
   else EFL_OBJECT_EVENT_CALLBACK_BLOCK(pd, desc, EFL_EVENT_CALLBACK_DEL, need_hash)
   else EFL_OBJECT_EVENT_CALLBACK_BLOCK(pd, desc, EFL_EVENT_DEL, need_hash)
   else EFL_OBJECT_EVENT_CALLBACK_BLOCK(pd, desc, EFL_EVENT_INVALIDATE, need_hash)
   else EFL_OBJECT_EVENT_CALLBACK_BLOCK(pd, desc, EFL_EVENT_NOREF, need_hash)
   else EFL_OBJECT_EVENT_CALLBACK_BLOCK(pd, desc, EFL_EVENT_DESTRUCT, need_hash)

   if (EINA_LIKELY(!legacy_compare && need_hash))
     {
        unsigned char event_hash;

        event_hash = _pointer_hash((uintptr_t) desc);
        if (!(pd->callbacks_mask & (1ULL << event_hash)))
          return EINA_TRUE;
     }

   if (pd->event_frame)
     frame.generation = ((Efl_Event_Callback_Frame*)pd->event_frame)->generation + 1;

   EVENT_STACK_PUSH(pd, &frame);

   callback_already_stopped = pd->callback_stopped;
   pd->callback_stopped = EINA_FALSE;
   ret = EINA_TRUE;

   ev.object = obj_id;
   ev.desc = desc;
   ev.info = event_info;

   // Handle event that require to restart where we were in the nested list walking
   // relatively unlikely so improve l1 instr cache by using goto
   if (desc->restart) goto restart;
   else idx = pd->callbacks_count;
restart_back:

   for (; idx > 0; idx--)
     {
        frame.idx = idx;
        cb = pd->callbacks + idx - 1;
        if (!(*cb)->delete_me)
          {
             if ((*cb)->generation >= frame.generation)
               continue;

             if ((*cb)->func_array)
               {
                  const Efl_Callback_Array_Item *it;

                  for (it = (*cb)->items.item_array; it->func; it++)
                    {
                       // Array callbacks are sorted, break if we are getting to high.
                       if (!legacy_compare &&
                           ((const unsigned char *) desc < (const unsigned char *) it->desc))
                         break;
                       if (!_cb_desc_match(it->desc, desc, legacy_compare))
                          continue;
                       if (!it->desc->unfreezable &&
                           (event_freeze_count || pd->event_freeze_count))
                          continue;

                       it->func((void *) (*cb)->func_data, &ev);
                       /* Abort callback calling if the func says so. */
                       if (pd->callback_stopped)
                         {
                            ret = EINA_FALSE;
                            goto end;
                         }
                    }
               }
             else
               {
                  if (!_cb_desc_match((*cb)->items.item.desc, desc, legacy_compare))
                    continue;
                  if (!(*cb)->items.item.desc->unfreezable &&
                      (event_freeze_count || pd->event_freeze_count))
                    continue;

                  (*cb)->items.item.func((void *) (*cb)->func_data, &ev);
                  /* Abort callback calling if the func says so. */
                  if (pd->callback_stopped)
                    {
                       ret = EINA_FALSE;
                       goto end;
                    }
               }
          }
        /*
         * copy back the idx that might have changed due to restarts, (theoretically only needed with restarts, condition made everything slower)
         * additionally adjust to event subscriptions that have been added in a event callback
         */
        idx = frame.idx + frame.inserted_before;
        frame.inserted_before = 0;
     }

end:
   // Handling restarting list walking complete exit.
   // This must be 1, we copy back the frame idx at the end of the for loop.
   // The next iteration then decrements the idx by 1 which results in the effective running idx of that frame beeing 0
   if (restart_lookup) restart_lookup->idx = 1;

   EVENT_STACK_POP(pd);

   _eo_callbacks_clear(obj_id, pd);

   pd->callback_stopped = callback_already_stopped;

   return ret;
restart:
   // Search for the next frame that has the same event description
   for (restart_lookup = frame.next; restart_lookup; restart_lookup = restart_lookup->next)
     {
        if (restart_lookup->desc == desc) break;
     }

   // Ensure that the idx is the next from the previous run, minimum number 0
   if (restart_lookup) {
     idx = restart_lookup->idx - 1;
   } else {
     idx = 0;
   }
   // If this is 0, then we are restarting
   if (!idx)
     idx = pd->callbacks_count;

   goto restart_back;
}

EOLIAN static Eina_Bool
_efl_object_event_callback_call(Eo *obj_id, Efl_Object_Data *pd,
            const Efl_Event_Description *desc,
            void *event_info)
{
   return _event_callback_call(obj_id, pd, desc, event_info, EINA_FALSE);
}

EO_API EFL_FUNC_BODYV(efl_event_callback_call,
                     Eina_Bool, 0, EFL_FUNC_CALL(desc, event_info),
                     const Efl_Event_Description *desc, void *event_info);

EOLIAN static Eina_Bool
_efl_object_event_callback_legacy_call(Eo *obj_id, Efl_Object_Data *pd,
            const Efl_Event_Description *desc,
            void *event_info)
{
   return _event_callback_call(obj_id, pd, desc, event_info, EINA_TRUE);
}

EO_API EFL_FUNC_BODYV(efl_event_callback_legacy_call,
                     Eina_Bool, 0, EFL_FUNC_CALL(desc, event_info),
                     const Efl_Event_Description *desc, void *event_info);

EOLIAN static void
_efl_object_event_callback_stop(Eo *obj EINA_UNUSED, Efl_Object_Data *pd)
{
   pd->callback_stopped = EINA_TRUE;
}

static void
_efl_event_forwarder_callback(void *data, const Efl_Event *event)
{
   Eo *new_obj = (Eo *) data;
   Eina_Bool ret = EINA_FALSE;

   ret = efl_event_callback_call(new_obj, event->desc, event->info);
   if (!ret)
     {
        efl_event_callback_stop(event->object);
     }
}

static void
_forwarders_list_clean(void *data)
{
   Efl_Event_Forwarder *forwarder;
   Eina_List *l = data;

   EINA_LIST_FREE(l, forwarder)
     {
        if (forwarder->source)
          {
             if (forwarder->inserted)
               efl_event_callback_del(forwarder->source,
                                      forwarder->desc,
                                      _efl_event_forwarder_callback,
                                      forwarder->new_obj);
             efl_wref_del(forwarder->source, &forwarder->source);
          }
        free(forwarder);
     }
}

EOLIAN static void
_efl_object_event_callback_forwarder_priority_add(Eo *obj, Efl_Object_Data *pd EINA_UNUSED,
                                                  const Efl_Event_Description *desc,
                                                  short priority,
                                                  Eo *new_obj)
{
   EO_OBJ_POINTER_RETURN(new_obj, new_data);
   EO_OBJ_DONE(new_obj);
   Efl_Event_Forwarder *forwarder;
   Efl_Object_Extension *ext;
   Efl_Object_Data *dpd;
   Eina_List *l;

   dpd = efl_data_scope_safe_get(new_obj, EFL_OBJECT_CLASS);
   EINA_SAFETY_ON_NULL_RETURN(dpd);

   ext = _efl_object_extension_need(dpd);
   EINA_SAFETY_ON_NULL_RETURN(ext);

   // Prevent double insertion for the same object source and event description
   EINA_LIST_FOREACH(eina_hash_find(ext->forwarders, desc), l, forwarder)
     {
        if (forwarder->desc == desc &&
            forwarder->new_obj == new_obj &&
            forwarder->source == obj)
          {
             ERR("Forwarder added on '%s' for event '%s' toward '%s' has already been set.\n",
                 efl_debug_name_get(obj), desc->name, efl_debug_name_get(new_obj));
             return;
          }
     }

   forwarder = malloc(sizeof (Efl_Event_Forwarder));
   EINA_SAFETY_ON_NULL_RETURN(forwarder);
   forwarder->desc = desc;
   forwarder->priority = priority;
   forwarder->new_obj = new_obj;
   efl_wref_add(obj, &forwarder->source);

   if (efl_event_callback_count(new_obj, desc) > 0)
     {
        efl_event_callback_priority_add(obj, desc, priority, _efl_event_forwarder_callback, new_obj);
        forwarder->inserted = EINA_TRUE;
     }
   else
     {
        forwarder->inserted = EINA_FALSE;
     }

   if (!ext->forwarders)
     ext->forwarders = eina_hash_pointer_new(_forwarders_list_clean);
   eina_hash_list_direct_append(ext->forwarders, forwarder->desc, forwarder);
}

EOLIAN static void
_efl_object_event_callback_forwarder_del(Eo *obj, Efl_Object_Data *pd EINA_UNUSED,
                                         const Efl_Event_Description *desc,
                                         Eo *new_obj)
{
   EO_OBJ_POINTER_RETURN(new_obj, new_data);
   EO_OBJ_DONE(new_obj);
   Efl_Event_Forwarder *forwarder;
   Efl_Object_Extension *ext;
   Efl_Object_Data *dpd;
   Eina_List *l, *tofree = NULL;

   dpd = efl_data_scope_safe_get(new_obj, EFL_OBJECT_CLASS);
   if (!dpd) return ;

   ext = dpd->ext;
   if (!ext) return ;

   EINA_LIST_FOREACH(eina_hash_find(ext->forwarders, desc), l, forwarder)
     {
        // Remove dead source at the same time we remove any forwader
        if (forwarder->source == obj || forwarder->source == NULL)
          tofree = eina_list_append(tofree, forwarder);
     }

   EINA_LIST_FREE(tofree, forwarder)
     {
        if (forwarder->source)
          {
             if (forwarder->inserted)
               efl_event_callback_del(obj, desc, _efl_event_forwarder_callback, new_obj);
             efl_wref_del(obj, &forwarder->source);
          }
        eina_hash_list_remove(ext->forwarders, desc, forwarder);
        free(forwarder);
     }
}

EOLIAN static void
_efl_object_event_freeze(Eo *obj EINA_UNUSED, Efl_Object_Data *pd)
{
   pd->event_freeze_count++;
}

EOLIAN static void
_efl_object_event_thaw(Eo *obj, Efl_Object_Data *pd)
{
   if (pd->event_freeze_count > 0)
     {
        pd->event_freeze_count--;
     }
   else
     {
        ERR("Events for object %p have already been thawed.", obj);
     }
}

EOLIAN static int
_efl_object_event_freeze_count_get(const Eo *obj EINA_UNUSED, Efl_Object_Data *pd)
{
   return pd->event_freeze_count;
}

EOLIAN static void
_efl_object_event_global_freeze(void)
{
   event_freeze_count++;
}

EOLIAN static void
_efl_object_event_global_thaw(void)
{
   if (event_freeze_count > 0)
     {
        event_freeze_count--;
     }
   else
     {
        ERR("Global events have already been thawed.");
     }
}

EOLIAN static int
_efl_object_event_global_freeze_count_get(void)
{
   return event_freeze_count;
}

EOLIAN static Eina_Bool
_efl_object_composite_attach(Eo *parent_id, Efl_Object_Data *pd EINA_UNUSED, Eo *comp_obj_id)
{
   Efl_Object_Optional *opt;
   Eo *emb_obj_id = NULL;

   EO_OBJ_POINTER_RETURN_VAL(comp_obj_id, comp_obj, EINA_FALSE);
   EO_OBJ_POINTER_GOTO(parent_id, parent, err_parent);

   /* FIXME: composite should fail if domains are different */

   /* Don't composite if we already have a composite object of this type */
     {
        Eina_List *itr;
        EINA_LIST_FOREACH(parent->opt->composite_objects, itr, emb_obj_id)
          {
             EO_OBJ_POINTER_GOTO(emb_obj_id, emb_obj, err_klass);
             if (EINA_UNLIKELY(emb_obj->klass == comp_obj->klass)) goto err_klass;
          }
        emb_obj_id = NULL;
     }

   Efl_Object_Data *comp_pd = efl_data_scope_get(comp_obj_id, EFL_OBJECT_CLASS);

   if (efl_composite_part_is(comp_obj_id))
     efl_composite_detach(comp_pd->ext->composite_parent, comp_obj_id);

   /* Set the parent comp on the child. */
   _efl_object_extension_need(comp_pd);
   comp_pd->ext->composite_parent = parent_id;

   opt = EO_OPTIONAL_COW_WRITE(parent);
   opt->composite_objects = eina_list_prepend(opt->composite_objects, comp_obj_id);
   EO_OPTIONAL_COW_END(opt, parent);

   if (emb_obj_id) EO_OBJ_DONE(emb_obj_id);
   EO_OBJ_DONE(parent_id);
   EO_OBJ_DONE(comp_obj_id);
   return EINA_TRUE;

err_klass:
   if (emb_obj_id) EO_OBJ_DONE(emb_obj_id);
   EO_OBJ_DONE(parent_id);
err_parent:
   EO_OBJ_DONE(comp_obj_id);
   return EINA_FALSE;
}

EOLIAN static Eina_Bool
_efl_object_composite_detach(Eo *parent_id, Efl_Object_Data *pd EINA_UNUSED, Eo *comp_obj_id)
{
   Efl_Object_Optional *opt;

   EO_OBJ_POINTER_RETURN_VAL(comp_obj_id, comp_obj, EINA_FALSE);
   EO_OBJ_POINTER_GOTO(parent_id, parent, err_parent);

   // unlikely so improve l1 instr cache by using goto
   if (!efl_composite_part_is(comp_obj_id)) goto err_part;

   opt = EO_OPTIONAL_COW_WRITE(parent);
   opt->composite_objects = eina_list_remove(opt->composite_objects, comp_obj_id);
   EO_OPTIONAL_COW_END(opt, parent);

   /* Clear the comp parent on the child. */
     {
        Efl_Object_Data *comp_pd = efl_data_scope_get(comp_obj_id, EFL_OBJECT_CLASS);
        comp_pd->ext->composite_parent = NULL;
        _efl_object_extension_noneed(comp_pd);
     }

   EO_OBJ_DONE(parent_id);
   EO_OBJ_DONE(comp_obj_id);
   return EINA_TRUE;

err_part:
   EO_OBJ_DONE(parent_id);
err_parent:
   EO_OBJ_DONE(comp_obj_id);
   return EINA_FALSE;
}

EOLIAN static Eina_Bool
_efl_object_composite_part_is(Eo *comp_obj_id EINA_UNUSED, Efl_Object_Data *pd)
{
   return pd->ext && pd->ext->composite_parent;
}

/* Eo_Dbg */
EO_API void
efl_dbg_info_free(Efl_Dbg_Info *info)
{
   eina_value_flush(&(info->value));
   eina_freeq_ptr_main_add(info, free, sizeof(*info));
}

static Eina_Bool
_eo_dbg_info_setup(const Eina_Value_Type *type, void *mem)
{
   memset(mem, 0, type->value_size);
   return EINA_TRUE;
}

static Eina_Bool
_eo_dbg_info_flush(const Eina_Value_Type *type EINA_UNUSED, void *_mem)
{
   Efl_Dbg_Info *mem = *(Efl_Dbg_Info **) _mem;
   eina_stringshare_del(mem->name);
   eina_value_flush(&(mem->value));
   eina_freeq_ptr_main_add(mem, free, sizeof(*mem));
   return EINA_TRUE;
}

static Eina_Bool
_eo_dbg_info_copy(const Eina_Value_Type *type EINA_UNUSED, const void *_src, void *_dst)
{
   const Efl_Dbg_Info **src = (const Efl_Dbg_Info **) _src;
   Efl_Dbg_Info **dst = _dst;

   *dst = calloc(1, sizeof(Efl_Dbg_Info));
   if (!*dst) return EINA_FALSE;
   (*dst)->name = eina_stringshare_ref((*src)->name);
   eina_value_copy(&((*src)->value), &((*dst)->value));
   return EINA_TRUE;
}

static Eina_Bool
_eo_dbg_info_convert_to(const Eina_Value_Type *type EINA_UNUSED, const Eina_Value_Type *convert, const void *type_mem, void *convert_mem)
{
   /* FIXME: For the meanwhile, just use the inner type for the value. */
   const Efl_Dbg_Info **src = (const Efl_Dbg_Info **) type_mem;
   if (convert == EINA_VALUE_TYPE_STRINGSHARE ||
       convert == EINA_VALUE_TYPE_STRING)
     {
        Eina_Bool ret;
        const char *other_mem;
        char *inner_val = eina_value_to_string(&(*src)->value);
        other_mem = inner_val;
        ret = eina_value_type_pset(convert, convert_mem, &other_mem);
        eina_freeq_ptr_main_add(inner_val, free, 0);
        return ret;
     }

   eina_error_set(EINA_ERROR_VALUE_FAILED);
   return EINA_FALSE;
}

static Eina_Bool
_eo_dbg_info_pset(const Eina_Value_Type *type EINA_UNUSED, void *_mem, const void *_ptr)
{
   Efl_Dbg_Info **mem = _mem;
   if (*mem) free(*mem);
   *mem = (void *) _ptr;
   return EINA_TRUE;
}

static Eina_Bool
_eo_dbg_info_pget(const Eina_Value_Type *type EINA_UNUSED, const void *_mem, void *_ptr)
{
   Efl_Dbg_Info **ptr = _ptr;
   *ptr = (void *) _mem;
   return EINA_TRUE;
}

static const Eina_Value_Type _EFL_DBG_INFO_TYPE = {
   EINA_VALUE_TYPE_VERSION,
   sizeof(Efl_Dbg_Info *),
   "Efl_Dbg_Info_Ptr",
   _eo_dbg_info_setup,
   _eo_dbg_info_flush,
   _eo_dbg_info_copy,
   NULL,
   _eo_dbg_info_convert_to,
   NULL,
   NULL,
   _eo_dbg_info_pset,
   _eo_dbg_info_pget
};

EO_API const Eina_Value_Type *EFL_DBG_INFO_TYPE = &_EFL_DBG_INFO_TYPE;


/* EOF event callbacks */

/* EFL_OBJECT_CLASS stuff */
#define MY_CLASS EFL_OBJECT_CLASS

static Eina_Value
_efl_future_cb(void *data, const Eina_Value value, const Eina_Future *dead_future)
{
   Efl_Future_Pending *pending = data;
   Eina_Value ret = value;
   const Eo *o;
   Efl_Object_Data *pd;

   EINA_SAFETY_ON_NULL_GOTO(pending, err);
   o = pending->o;
   pd = efl_data_scope_get(o, EFL_OBJECT_CLASS);
   EINA_SAFETY_ON_NULL_GOTO(pd, err);

   pd->pending_futures = eina_inlist_remove(pd->pending_futures,
                                            EINA_INLIST_GET(pending));
   efl_ref(o);
   EASY_FUTURE_DISPATCH(ret, value, dead_future, &pending->desc, (void*) o, (void*) pending->desc.data);
   efl_unref(o);
   _efl_pending_future_free(pending);

   return ret;

 err:
   eina_value_setup(&ret, EINA_VALUE_TYPE_ERROR);
   eina_value_set(&ret, ENOMEM);
   return ret;
}

EO_API Eina_Future_Desc
efl_future_cb_from_desc(const Eo *o, const Efl_Future_Cb_Desc desc)
{
   Efl_Future_Pending *pending = NULL;
   Eina_Future **storage = NULL;
   Efl_Object_Data *pd;
   Eina_Bool invalidate;

   EINA_SAFETY_ON_NULL_GOTO(o, end);
   pd = efl_data_scope_get(o, EFL_OBJECT_CLASS);
   EINA_SAFETY_ON_NULL_GOTO(pd, end);
   EO_OBJ_POINTER_GOTO(o, eo_obj, end);
   invalidate = eo_obj->invalidate;
   EO_OBJ_DONE(o);
   EINA_SAFETY_ON_TRUE_GOTO(invalidate, end);
   pending = _efl_pending_future_new();
   EINA_SAFETY_ON_NULL_GOTO(pending, end);
   memcpy(&pending->desc, &desc, sizeof(Efl_Future_Cb_Desc));
   pending->o = o;
   pending->future = NULL;
   if (!pending->desc.storage) pending->desc.storage = &pending->future;
   pd->pending_futures = eina_inlist_append(pd->pending_futures,
                                            EINA_INLIST_GET(pending));
   storage = pending->desc.storage;
 end:
   return (Eina_Future_Desc){ .cb = _efl_future_cb, .data = pending, .storage = storage };
}

EO_API Eina_Future *
efl_future_chain_array(Eo *obj,
                       Eina_Future *prev,
                       const Efl_Future_Cb_Desc descs[])
{
   ssize_t i = -1;
   Eina_Future *f = prev;

   for (i = 0; descs[i].success || descs[i].error || descs[i].free || descs[i].success_type; i++)
     {
        Eina_Future_Desc eina_desc = efl_future_cb_from_desc(obj, descs[i]);
        f = eina_future_then_from_desc(f, eina_desc);
        EINA_SAFETY_ON_NULL_GOTO(f, err);
     }

   return f;

 err:
   /*
     There's no need to cancel the futures, since eina_future_then_from_desc()
     will cancel the whole chain in case of failure.
     All we need to do is to free the remaining descs
   */
   for (i = i + 1; descs[i].error || descs[i].free; i++)
     {
        if (descs[i].error)
          {
             Eina_Value r = descs[i].error(obj, (void*) descs[i].data, ENOMEM);
             eina_value_flush(&r);
          }
        if (descs[i].free) descs[i].free(obj, (void*) descs[i].data, NULL);
     }
   return NULL;
}

EOLIAN static Eo *
_efl_object_constructor(Eo *obj, Efl_Object_Data *pd EINA_UNUSED)
{
   DBG("%p - %s.", obj, efl_class_name_get(obj));

   _eo_condtor_done(obj);

   return obj;
}

EOLIAN static void
_efl_object_destructor(Eo *obj, Efl_Object_Data *pd)
{
   _Eo_Object *obj_child;
   Eina_Inlist *l;
   Efl_Object_Extension *ext;
   _Eo_Object *obj_data2 = NULL;

   DBG("%p - %s.", obj, efl_class_name_get(obj));

   // special removal - remove from children list by hand after getting
   // child handle in case unparent method is overridden and does
   // extra things like removes other children too later on in the list
   // this is a goto because more often than not objects do not have children
   // so it's unlikely they will need the child cleanup code to so to have
   // better l1 cache instruction coherency, move this to the end
   if (pd->children) goto children;
children_back:

   // If we are a composite object, detach children. it is quite unlikely
   // we are a composite object, so put the core of this handling
   // at the end out of l1 cache prefetch
     {
        EO_OBJ_POINTER_RETURN(obj, obj_data);
        obj_data2 = obj_data;
        if (obj_data->opt->composite_objects) goto composite_obj;
composite_obj_back:
        EO_OBJ_DONE(obj);
     }

   if (pd->ext && pd->ext->composite_parent)
     efl_composite_detach(pd->ext->composite_parent, obj);

   // parent still being here is unlikely, so move error handling out of the
   // code execution path
   if (pd->parent) goto err_parent;
err_parent_back:

   // this isn't 100% correct, as the object is still "slightly" alive at this
   // point (so efl_destructed_is() returns false), but triggering the
   // "destruct" event here is the simplest, safest solution.
   if (EINA_UNLIKELY(pd->event_cb_EFL_EVENT_DESTRUCT))
     _event_callback_call(obj, pd, EFL_EVENT_DESTRUCT, NULL, EINA_FALSE);

   // remove generic data after this final event, in case they are used in a cb
   _eo_generic_data_del_all(obj, pd);
   _eo_callback_remove_all(pd);

   _wref_destruct(pd);

   ext = pd->ext;
   // it is rather likely we dont have any extension section for most objects
   // so return immediately here to avoid pulling in more instructions to
   // the 1l cache if we can
   if (!ext)
     {
        _eo_condtor_done(obj);
        return;
     }
   eina_stringshare_del(ext->name);
   ext->name = NULL;
   eina_stringshare_del(ext->comment);
   ext->comment = NULL;
   _efl_object_extension_noneed(pd);
   _eo_condtor_done(obj);
   return;

children:
   ERR("Object %p of type '%s' is still holding child at time of destruction.\n",
       obj, efl_class_name_get(obj));
   EINA_INLIST_FOREACH_SAFE(pd->children, l, obj_child)
     {
        Eo *child;

        child = _eo_obj_id_get(obj_child);
        efl_parent_set(child, NULL);
     }
   goto children_back;

composite_obj:
     {
        Eina_List *itr, *next;
        Eo *emb_obj_id;

        EINA_LIST_FOREACH_SAFE(obj_data2->opt->composite_objects, itr, next, emb_obj_id)
          {
             efl_composite_detach(obj, emb_obj_id);
          }
     }
   goto composite_obj_back;

err_parent:
   if (EINA_LIKELY(!pd->allow_parent_unref))
     ERR("Object '%p' of type '%s' still has a parent at the time of destruction.", obj, efl_class_name_get(obj));
   efl_parent_set(obj, NULL);
   goto err_parent_back;
}

EOLIAN static void
_efl_object_allow_parent_unref_set(Eo *obj_id, Efl_Object_Data *pd, Eina_Bool allow)
{
   EO_OBJ_POINTER_RETURN(obj_id, obj);
   obj->allow_parent_unref = !!allow;
   pd->allow_parent_unref = !!allow;
   EO_OBJ_DONE(obj_id);
}

EOLIAN static Eina_Bool
_efl_object_allow_parent_unref_get(const Eo *obj_id EINA_UNUSED, Efl_Object_Data *pd)
{
   return pd->allow_parent_unref;
}

EO_API void
___efl_auto_unref_set(Eo *obj_id, Eina_Bool enable)
{
   // Write-only property
   EO_OBJ_POINTER_RETURN(obj_id, obj);
   obj->auto_unref = enable ? 1 : 0;
   EO_OBJ_DONE(obj_id);
}

EOLIAN static Eo *
_efl_object_finalize(Eo *obj, Efl_Object_Data *pd EINA_UNUSED)
{
   return obj;
}

EOLIAN static void
_efl_object_class_constructor(Efl_Class *klass EINA_UNUSED)
{
   event_freeze_count = 0;
   _legacy_events_hash = eina_hash_stringshared_new(_legacy_events_hash_free_cb);

   _eo_callback_mempool =
      eina_mempool_add("chained_mempool", NULL, NULL,
                       sizeof(Eo_Callback_Description), 256);

   _efl_pending_future_mempool =
      eina_mempool_add("chained_mempool", NULL, NULL,
                       sizeof(Efl_Future_Pending), 256);

   _efl_future_scheduler_entry_mempool =
     eina_mempool_add("chained_mempool", NULL, NULL,
                      sizeof(Efl_Future_Scheduler_Entry), 256);

   _eo_nostep_alloc = !!getenv("EO_NOSTEP_ALLOC");
}

EOLIAN static void
_efl_object_class_destructor(Efl_Class *klass EINA_UNUSED)
{
   eina_mempool_del(_efl_future_scheduler_entry_mempool);
   eina_mempool_del(_efl_pending_future_mempool);
   eina_mempool_del(_eo_callback_mempool);
   eina_hash_free(_legacy_events_hash);
}

#define EFL_OBJECT_EXTRA_OPS \
   EFL_OBJECT_OP_FUNC(efl_event_callback_priority_add, _efl_object_event_callback_priority_add), \
   EFL_OBJECT_OP_FUNC(efl_event_callback_del, _efl_object_event_callback_del), \
   EFL_OBJECT_OP_FUNC(efl_event_callback_array_priority_add, _efl_object_event_callback_array_priority_add), \
   EFL_OBJECT_OP_FUNC(efl_event_callback_array_del, _efl_object_event_callback_array_del), \
   EFL_OBJECT_OP_FUNC(efl_event_callback_call, _efl_object_event_callback_call), \
   EFL_OBJECT_OP_FUNC(efl_event_callback_legacy_call, _efl_object_event_callback_legacy_call), \
   EFL_OBJECT_OP_FUNC(efl_event_future_scheduler_get, _efl_object_event_future_scheduler_get), \
   EFL_OBJECT_OP_FUNC(efl_event_callback_count, _efl_object_event_callback_count), \
   EFL_OBJECT_OP_FUNC(efl_dbg_info_get, _efl_object_dbg_info_get), \
   EFL_OBJECT_OP_FUNC(efl_wref_add, _efl_object_wref_add), \
   EFL_OBJECT_OP_FUNC(efl_wref_del, _efl_object_wref_del), \
   EFL_OBJECT_OP_FUNC(efl_key_data_set, _efl_object_key_data_set), \
   EFL_OBJECT_OP_FUNC(efl_key_data_get, _efl_object_key_data_get), \
   EFL_OBJECT_OP_FUNC(efl_key_ref_set, _efl_object_key_ref_set), \
   EFL_OBJECT_OP_FUNC(efl_key_ref_get, _efl_object_key_ref_get), \
   EFL_OBJECT_OP_FUNC(efl_key_wref_set, _efl_object_key_wref_set), \
   EFL_OBJECT_OP_FUNC(efl_key_wref_get, _efl_object_key_wref_get), \
   EFL_OBJECT_OP_FUNC(efl_key_value_set, _efl_object_key_value_set), \
   EFL_OBJECT_OP_FUNC(efl_key_value_get, _efl_object_key_value_get) \

#include "efl_object.eo.c"