efl/src/lib/eo/eo.c

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

#ifdef HAVE_DLADDR
# include <dlfcn.h>
#endif

#include <Eina.h>

#include "Eo.h"
#include "eo_ptr_indirection.h"
#include "eo_private.h"

#define EO_CLASS_IDS_FIRST 1
#define EO_OP_IDS_FIRST 1

/* Used inside the class_get functions of classes, see #EO_DEFINE_CLASS */
EAPI Eina_Spinlock _eo_class_creation_lock;
int _eo_log_dom = -1;

static _Eo_Class **_eo_classes;
static Eo_Id _eo_classes_last_id;
static int _eo_init_count = 0;
static Eo_Op _eo_ops_last_id = 0;

static size_t _eo_sz = 0;
static size_t _eo_class_sz = 0;

static void _eo_condtor_reset(_Eo_Object *obj);
static inline void *_eo_data_scope_get(const _Eo_Object *obj, const _Eo_Class *klass);
static inline void *_eo_data_xref_internal(const char *file, int line, _Eo_Object *obj, const _Eo_Class *klass, const _Eo_Object *ref_obj);
static inline void _eo_data_xunref_internal(_Eo_Object *obj, void *data, const _Eo_Object *ref_obj);
static const _Eo_Class *_eo_op_class_get(Eo_Op op);
static const char * _eo_op_id_name_get(Eo_Op op);

/* Start of Dich */

/* How we search and store the implementations in classes. */
#define DICH_CHAIN_LAST_BITS 5
#define DICH_CHAIN_LAST_SIZE (1 << DICH_CHAIN_LAST_BITS)
#define DICH_CHAIN1(x) ((x) >> DICH_CHAIN_LAST_BITS)
#define DICH_CHAIN_LAST(x) ((x) & ((1 << DICH_CHAIN_LAST_BITS) - 1))


/* We are substracting the mask here instead of "AND"ing because it's a hot path,
 * it should be a valid class at this point, and this lets the compiler do 1
 * substraction at compile time. */
#define _UNMASK_ID(id) ((id) - MASK_CLASS_TAG)
#define ID_CLASS_GET(id) ({ \
      (_Eo_Class *) (((_UNMASK_ID(id) <= _eo_classes_last_id) && (_UNMASK_ID(id) > 0)) ? \
      (_eo_classes[_UNMASK_ID(id) - 1]) : NULL); \
      })

static inline void
_dich_chain_alloc(Dich_Chain1 *chain1)
{
   if (!chain1->funcs)
     {
        chain1->funcs = calloc(DICH_CHAIN_LAST_SIZE, sizeof(*(chain1->funcs)));
     }
}

static inline void
_dich_copy_all(_Eo_Class *dst, const _Eo_Class *src)
{
   Eo_Op i;
   const Dich_Chain1 *sc1 = src->chain;
   Dich_Chain1 *dc1 = dst->chain;
   for (i = 0 ; i < src->chain_size ; i++, sc1++, dc1++)
     {
        if (sc1->funcs)
          {
             size_t j;

             _dich_chain_alloc(dc1);

             const op_type_funcs *sf = sc1->funcs;
             op_type_funcs *df = dc1->funcs;
             for (j = 0 ; j < DICH_CHAIN_LAST_SIZE ; j++, df++, sf++)
               {
                  if (sf->func)
                    {
                       memcpy(df, sf, sizeof(*df));
                    }
               }
          }
     }
}

static inline const op_type_funcs *
_dich_func_get(const _Eo_Class *klass, Eo_Op op)
{
   size_t idx1 = DICH_CHAIN1(op);
   if (EINA_UNLIKELY(idx1 >= klass->chain_size))
      return NULL;
   Dich_Chain1 *chain1 = &klass->chain[idx1];
   if (EINA_UNLIKELY(!chain1->funcs))
      return NULL;
   return &chain1->funcs[DICH_CHAIN_LAST(op)];
}

static inline Eina_Bool
_dich_func_set(_Eo_Class *klass, Eo_Op op, eo_op_func_type func)
{
   op_type_funcs *fsrc;
   size_t idx1 = DICH_CHAIN1(op);
   Dich_Chain1 *chain1 = &klass->chain[idx1];
   _dich_chain_alloc(chain1);
   fsrc = &chain1->funcs[DICH_CHAIN_LAST(op)];
   if (fsrc->src == klass)
     {
        const _Eo_Class *op_kls = _eo_op_class_get(op);
        const char *op_name = _eo_op_id_name_get(op);
        ERR("Class '%s': Overriding func %p for op %d (%s:'%s') with %p.",
              klass->desc->name, fsrc->func, op, op_kls->desc->name, op_name, func);
        return EINA_FALSE;
     }

   fsrc->func = func;
   fsrc->src = klass;

   return EINA_TRUE;
}

static inline void
_dich_func_clean_all(_Eo_Class *klass)
{
   size_t i;
   Dich_Chain1 *chain1 = klass->chain;

   for (i = 0 ; i < klass->chain_size ; i++, chain1++)
     {
        if (chain1->funcs)
           free(chain1->funcs);
     }
   free(klass->chain);
   klass->chain = NULL;
}

/* END OF DICH */

static inline Eina_Bool
_eo_is_a_class(const Eo *eo_id)
{
   Eo_Id oid;
#ifdef HAVE_EO_ID
   oid = (Eo_Id) eo_id;
#else
   /* fortunately EO_OBJ_POINTER_RETURN* will handle NULL eo_id */
   if (!eo_id) return EINA_FALSE;
   oid = ((Eo_Base *) eo_id)->id;
#endif
   return ((((oid >> REF_TAG_SHIFT) & 0x1) == 0x0) &&
         (oid & MASK_CLASS_TAG));
}

static inline _Eo_Class *
_eo_class_pointer_get(const Eo_Class *klass_id)
{
#ifdef HAVE_EO_ID
   return ID_CLASS_GET((Eo_Id)klass_id);
#else
   return (_Eo_Class *) klass_id;
#endif
}

static const _Eo_Class *
_eo_op_class_get(Eo_Op op)
{
   /* FIXME: Make it fast. */
   _Eo_Class **itr = _eo_classes;
   int mid, max, min;

   min = 0;
   max = _eo_classes_last_id - 1;
   while (min <= max)
     {
        mid = (min + max) / 2;

        if (itr[mid]->base_id + itr[mid]->desc->ops.count < op)
           min = mid + 1;
        else if (itr[mid]->base_id  > op)
           max = mid - 1;
        else
           return itr[mid];
     }

   return NULL;
}

static const Eo_Op_Description *
_eo_op_id_desc_get(Eo_Op op)
{
   unsigned int i;
   const _Eo_Class *klass;
   const Eo_Op_Description *op_descs;

   if (op == EO_NOOP)
      return NULL;

   klass = _eo_op_class_get(op);

   if (klass)
     {
        DBG("klass %p %s", klass, klass->desc->name);

        op_descs = klass->desc->ops.descs;
        for (i = 0; i <  klass->desc->ops.count; i++)
          {
             if (op_descs[i].op == op)
               return &op_descs[i];
          }
     }

   return NULL;
}

static const char *
_eo_op_id_name_get(Eo_Op op)
{
   const Eo_Op_Description *desc = _eo_op_id_desc_get(op);
   return (desc) ? desc->doc : NULL;
}

static inline const op_type_funcs *
_eo_kls_itr_next(const _Eo_Class *orig_kls, const _Eo_Class *cur_klass, Eo_Op op)
{
   const _Eo_Class **kls_itr = NULL;

   /* Find the kls itr. */
   kls_itr = orig_kls->mro;
   while (*kls_itr && (*kls_itr != cur_klass))
      kls_itr++;

   if (*kls_itr)
     {
        kls_itr++;
        while (*kls_itr)
          {
             const op_type_funcs *fsrc = _dich_func_get(*kls_itr, op);
             if (!fsrc || !fsrc->func)
               {
                  kls_itr++;
                  continue;
               }
             return fsrc;
          }
     }

   return NULL;
}

/************************************ EO ************************************/

EAPI Eo_Hook_Call eo_hook_call_pre = NULL;
EAPI Eo_Hook_Call eo_hook_call_post = NULL;

#define EO_INVALID_DATA (void *) -1
// 1024 entries == 16k or 32k (32 or 64bit) for eo call stack. that's 1023
// imbricated/recursive calls it can handle before barfing. i'd say that's ok
#define EO_CALL_STACK_DEPTH_MIN 1024
#define EO_CALL_STACK_SHRINK_DROP (EO_CALL_STACK_DEPTH_MIN >> 1)

typedef struct _Eo_Stack_Frame
{
   const Eo          *eo_id;
   union {
        _Eo_Object        *obj;
        const _Eo_Class   *kls;
   } o;
   const _Eo_Class   *cur_klass;
   void              *obj_data;
} Eo_Stack_Frame;

#define EO_CALL_STACK_SIZE (EO_CALL_STACK_DEPTH_MIN * sizeof(Eo_Stack_Frame))

static Eina_TLS _eo_call_stack_key = 0;

typedef struct _Eo_Call_Stack {
   Eo_Stack_Frame *frames;
   Eo_Stack_Frame *frame_ptr;
   Eo_Stack_Frame *last_frame;
   Eo_Stack_Frame *shrink_frame;
} Eo_Call_Stack;

#define MEM_PAGE_SIZE 4096

static void *
_eo_call_stack_mem_alloc(size_t size)
{
#ifdef HAVE_MMAP
   // allocate eo call stack via mmped anon segment if on linux - more
   // secure and safe. also gives page aligned memory allowing madvise
   void *ptr;
   size_t newsize;
   newsize = MEM_PAGE_SIZE * ((size + MEM_PAGE_SIZE - 1) /
                              MEM_PAGE_SIZE);
   ptr = mmap(NULL, newsize, PROT_READ | PROT_WRITE,
              MAP_PRIVATE | MAP_ANON, -1, 0);
   if (ptr == MAP_FAILED)
     {
        ERR("eo call stack mmap failed.");
        return NULL;
     }
   return ptr;
#else
   //in regular cases just use malloc
   return calloc(1, size);
#endif
}

#ifdef HAVE_MMAP
static void
_eo_call_stack_mem_resize(void **ptr EINA_UNUSED, size_t newsize, size_t size)
{
   // FIXME we don't grow
   if (newsize > size)
     {
        CRI("eo call stack overflow, abort.");
        abort();
     }
   // FIXME resize call stack down
   return;
   size_t addr = MEM_PAGE_SIZE * ((newsize + MEM_PAGE_SIZE - 1) /
                                  MEM_PAGE_SIZE);
   madvise(((unsigned char *)*ptr) + addr, size - addr, MADV_DONTNEED);
#else
static void
_eo_call_stack_mem_resize(void **ptr, size_t newsize, size_t size EINA_UNUSED)
{
   *ptr = realloc(*ptr, newsize);
   if (!*ptr)
     {
        CRI("eo call stack resize failed, abort.");
        abort();
     }
#endif
}

#ifdef HAVE_MMAP
static void
_eo_call_stack_mem_free(void *ptr, size_t size)
{
   // free mmaped memory
   munmap(ptr, size);
#else
static void
_eo_call_stack_mem_free(void *ptr, size_t size EINA_UNUSED)
{
   // free regular memory
   free(ptr);
#endif
}

static Eo_Call_Stack *
_eo_call_stack_create()
{
   Eo_Call_Stack *stack;

   stack = calloc(1, sizeof(Eo_Call_Stack));
   if (!stack)
     return NULL;

   stack->frames = _eo_call_stack_mem_alloc(EO_CALL_STACK_SIZE);
   if (!stack->frames)
     {
        free(stack);
        return NULL;
     }

   // first frame is never used
   stack->frame_ptr = stack->frames;
   stack->last_frame = &stack->frames[EO_CALL_STACK_DEPTH_MIN - 1];
   stack->shrink_frame = stack->frames;

   return stack;
}

static void
_eo_call_stack_free(void *ptr)
{
   Eo_Call_Stack *stack = (Eo_Call_Stack *) ptr;

   if (!stack) return;

   if (stack->frames)
     _eo_call_stack_mem_free(stack->frames, EO_CALL_STACK_SIZE);

   free(stack);
}

static inline Eo_Call_Stack *
_eo_call_stack_get(Eina_Bool is_main_loop)
{
   static Eo_Call_Stack *main_loop_stack = NULL;
   Eo_Call_Stack *stack = is_main_loop ?
     main_loop_stack : eina_tls_get(_eo_call_stack_key);

   if (stack) return stack;

   stack = _eo_call_stack_create();
   if (!stack)
     {
        EINA_LOG_ERR("Could not alloc eo call stack.");
        return NULL;
     }

   if (is_main_loop)
     {
        main_loop_stack = stack;
     }
   else if (!eina_tls_set(_eo_call_stack_key, stack))
     {
        EINA_LOG_ERR("Could not set eo call stack in TLS key.");
        _eo_call_stack_free(stack);
        return NULL;
     }

   return stack;
}

static inline void
_eo_call_stack_resize(Eo_Call_Stack *stack, Eina_Bool grow)
{
   size_t sz, next_sz;
   int frame_offset;

   sz = stack->last_frame - stack->frames + 1;
   if (grow)
     next_sz = sz * 2;
   else
     next_sz = sz / 2;
   frame_offset = stack->frame_ptr - stack->frames;

   DBG("resize from %lu to %lu", (long unsigned int)sz, (long unsigned int)next_sz);
   _eo_call_stack_mem_resize((void **)&(stack->frames),
                             next_sz * sizeof(Eo_Stack_Frame),
                             sz * sizeof(Eo_Stack_Frame));
   if (!stack->frames)
     {
        CRI("unable to resize call stack, abort.");
        abort();
     }

   stack->frame_ptr = &stack->frames[frame_offset];
   stack->last_frame = &stack->frames[next_sz - 1];

   if (next_sz == EO_CALL_STACK_DEPTH_MIN)
     frame_offset = 0;
   else
     {
        if (grow)
          frame_offset = sz - EO_CALL_STACK_SHRINK_DROP;
        else
          frame_offset = (next_sz / 2) - EO_CALL_STACK_SHRINK_DROP;
     }
   stack->shrink_frame = &stack->frames[frame_offset];
}

static inline Eina_Bool
_eo_do_internal(const Eo *eo_id, const Eo_Class *cur_klass_id,
                Eina_Bool is_super, Eo_Stack_Frame *fptr, Eo_Stack_Frame *pfptr)
{
   Eina_Bool is_klass = _eo_is_a_class(eo_id);

   /* If we are already in the same object context, we inherit info from it. */
   if (pfptr)
     {
        memcpy(fptr, pfptr, sizeof(Eo_Stack_Frame));
        if (!is_klass)
          _eo_ref(fptr->o.obj);
     }
   else
     {
        fptr->eo_id = eo_id;
        fptr->obj_data = EO_INVALID_DATA;
        if (is_klass)
          {
             EO_CLASS_POINTER_RETURN_VAL(eo_id, _klass, EINA_FALSE);
             fptr->o.kls = _klass;
          }
        else
          {
             EO_OBJ_POINTER_RETURN_VAL(eo_id, _obj, EINA_FALSE);
             fptr->o.obj = _obj;
             _eo_ref(_obj);
          }
     }

   if (is_super)
     {
        EO_CLASS_POINTER_RETURN_VAL(cur_klass_id, cur_klass, EINA_FALSE);
        if (fptr->cur_klass == cur_klass)
          fptr->obj_data = EO_INVALID_DATA;
        fptr->cur_klass = cur_klass;
     }
   else
     {
        fptr->cur_klass = NULL;
     }

   return EINA_TRUE;
}

EAPI Eina_Bool
_eo_do_start(const Eo *eo_id, const Eo_Class *cur_klass_id, Eina_Bool is_super, const char *file EINA_UNUSED, const char *func EINA_UNUSED, int line EINA_UNUSED)
{
   Eina_Bool is_main_loop = eina_main_loop_is();
   Eina_Bool ret = EINA_TRUE;
   Eo_Stack_Frame *fptr, *pfptr;
   Eo_Call_Stack *stack = _eo_call_stack_get(is_main_loop);

   if (stack->frame_ptr == stack->last_frame)
     _eo_call_stack_resize(stack, EINA_TRUE);

   fptr = stack->frame_ptr;

   pfptr = ((eo_id) && (fptr->eo_id == eo_id) ? fptr : NULL);
   fptr++;

   if (!_eo_do_internal(eo_id, cur_klass_id, is_super, fptr, pfptr))
     {
        fptr->o.obj = NULL;
        fptr->cur_klass = NULL;

        ret = EINA_FALSE;
     }

   stack->frame_ptr++;

   return ret;
}

EAPI void
_eo_do_end(void)
{
   Eo_Stack_Frame *fptr;
   Eo_Call_Stack *stack = _eo_call_stack_get(eina_main_loop_is()); // Is it possible to extract information from the scope ?

   fptr = stack->frame_ptr;

   if (!_eo_is_a_class(fptr->eo_id) && fptr->o.obj)
     _eo_unref(fptr->o.obj);

   fptr->obj_data = EO_INVALID_DATA;

   if (fptr == stack->frames)
     {
        CRI("eo call stack underflow, abort.");
        abort();
     }

   stack->frame_ptr--;

   if (fptr == stack->shrink_frame)
     _eo_call_stack_resize(stack, EINA_FALSE);
}

EAPI Eina_Bool
  _eo_call_resolve(const char *func_name, const Eo_Op op, Eo_Op_Call_Data *call, Eina_Bool is_main_loop, const char *file, int line)
{
   Eo_Stack_Frame *fptr;
   const _Eo_Class *klass;
   const op_type_funcs *func;
   Eina_Bool is_obj;

   if (op == EO_NOOP) return EINA_FALSE;

   fptr = _eo_call_stack_get(is_main_loop)->frame_ptr;

   if (EINA_UNLIKELY(!fptr->o.obj))
      return EINA_FALSE;

   is_obj = !_eo_is_a_class(fptr->eo_id);

   klass = (is_obj) ? fptr->o.obj->klass : fptr->o.kls;

   /* If we have a current class, we need to itr to the next. */
   if (fptr->cur_klass)
     {
        func = _eo_kls_itr_next(klass, fptr->cur_klass, op);

        if (!func)
          goto end;

        klass = func->src;
     }
   else
     {
        func = _dich_func_get(klass, op);

        if (!func)
          goto end;
     }

   if (EINA_LIKELY(func->func && func->src))
     {
        call->func = func->func;
        call->klass = _eo_class_id_get(klass);

        if (is_obj)
          {
             call->obj = (Eo *)fptr->eo_id;
             if (func->src == fptr->o.obj->klass)
               {
                  if (fptr->obj_data == EO_INVALID_DATA)
                    fptr->obj_data = _eo_data_scope_get(fptr->o.obj, func->src);

                  call->data = fptr->obj_data;
               }
             else
               call->data = _eo_data_scope_get(fptr->o.obj, func->src);
          }
        else
          {
             call->obj = call->klass;
             call->data = NULL;
          }

        return EINA_TRUE;
     }

   if (func->src != NULL)
     {
        ERR("in %s:%d: you called a pure virtual func '%s' (%d) of class '%s'.",
            file, line, func_name, op, klass->desc->name);
        return EINA_FALSE;
     }


end:
   /* Try composite objects */
   if (is_obj)
     {
        Eina_List *itr;
        Eo *emb_obj_id;
        EINA_LIST_FOREACH(((_Eo_Object *) fptr->o.obj)->composite_objects, itr, emb_obj_id)
          {
             _Eo_Object *emb_obj = _eo_obj_pointer_get((Eo_Id)emb_obj_id);

             if (!emb_obj)
               continue;

             func = _dich_func_get(emb_obj->klass, op);
             if (func == NULL)
               continue;

             if (EINA_LIKELY(func->func && func->src))
               {
                  call->obj = _eo_id_get(emb_obj);
                  call->klass = _eo_class_id_get(emb_obj->klass);
                  call->func = func->func;
                  call->data = _eo_data_scope_get(emb_obj, func->src);

                  return EINA_TRUE;
               }
          }
     }

     {
        const _Eo_Class *main_klass;
        main_klass = (is_obj) ? fptr->o.obj->klass : fptr->o.kls;

        /* If it's a do_super call. */
        if (fptr->cur_klass)
          {
             ERR("in %s:%d: func '%s' (%d) could not be resolved for class '%s' for super of '%s'.",
                 file, line, func_name, op, main_klass->desc->name,
                 fptr->cur_klass->desc->name);
          }
        else
          {
             /* we should not be able to take this branch */
             ERR("in %s:%d: func '%s' (%d) could not be resolved for class '%s'.",
                 file, line, func_name, op, main_klass->desc->name);
          }
     }
   return EINA_FALSE;
}


static inline const Eo_Op_Description *
_eo_api_desc_get(const void *api_func, const _Eo_Class *klass, const _Eo_Class **extns, const char *api_name)
{
   int imin, imax, imid;
   const _Eo_Class *cur_klass;
   const _Eo_Class **kls_itr = NULL;
   const Eo_Op_Description *op_desc;
   const Eo_Op_Description *op_descs;

   if (klass)
     {
        for (kls_itr = klass->mro ; *kls_itr ; kls_itr++)
          {
             cur_klass = *kls_itr;
             imin = 0;
             imax = cur_klass->desc->ops.count - 1;
             op_descs = cur_klass->desc->ops.descs;

             while (imax >= imin)
               {
                  imid = (imax + imin) / 2;
                  op_desc = op_descs + imid;

                  if (op_desc->api_func > api_func)
                    imin = imid + 1;
                  else if (op_desc->api_func < api_func)
                    imax = imid - 1;
                  else
                    return op_desc;
               }

#ifdef _WIN32
             /* On Windows, DLL API's will be exported using the dllexport flag.
              * When used by another library or executable, they will be declared
              * using the dllimport flag. What happens really is that two symbols are
              * created, at two different addresses. So it's impossible to match
              * them. We fallback to plain string comparison based on the
              * function name itself. Slow, but this should rarely happen.
              */
             for (unsigned int i = 0; i < cur_klass->desc->ops.count; i++)
               if (api_name && !strcmp(api_name, op_descs[i].api_name))
                 {
                    if (op_descs[i].api_func == NULL || op_descs[i].api_func == ((void (*)())-1))
                      break;
                    return &op_descs[i];
                 }
#endif
          }
     }

   if (extns)
     {
        for (kls_itr = extns ; *kls_itr ; kls_itr++)
          {
             cur_klass = *kls_itr;
             op_desc = _eo_api_desc_get(api_func, cur_klass, NULL, api_name);
             if (op_desc) return op_desc;
          }
     }

   return NULL;
}

EAPI Eo_Op
_eo_api_op_id_get(const void *api_func, Eina_Bool is_main_loop, const char *file, int line)
{
   const Eo_Op_Description *desc;
   const _Eo_Class *klass;
   Eo_Call_Stack *stack = _eo_call_stack_get(is_main_loop);

   Eina_Bool class_ref = _eo_is_a_class(stack->frame_ptr->eo_id);

   if (EINA_UNLIKELY(!stack->frame_ptr->o.obj))
      return EO_NOOP;

   if (class_ref)
     klass = stack->frame_ptr->o.kls;
   else
     klass = stack->frame_ptr->o.obj->klass;

   // Win32 compatibility: api_name is NULL because we're assuming the
   // function pointer is correct (it was referred to using the same
   // dllimport vs. dllexport flags).
   desc = _eo_api_desc_get(api_func, klass, klass->extensions, NULL);

   if (desc == NULL)
     {
        const char *fct_name = "unknown";
#ifdef HAVE_DLADDR
        Dl_info info;
        if (dladdr(api_func, &info) != 0)
          fct_name = info.dli_sname;
#endif
        ERR("in %s:%d: unable to resolve %s api func '%s' %p in class '%s'.",
            file, line, (class_ref ? "class" : "regular"),
            fct_name, api_func, klass->desc->name);
        return EO_NOOP;
     }

   return desc->op;
}

static int
eo_api_funcs_cmp(const void *p1, const void *p2)
{
   const Eo_Op_Description *op1, *op2;
   op1 = (Eo_Op_Description *) p1;
   op2 = (Eo_Op_Description *) p2;
   if (op1->api_func > op2->api_func) return -1;
   else if (op1->api_func < op2->api_func) return 1;
   else return 0;
}

static Eina_Bool
_eo_class_funcs_set(_Eo_Class *klass)
{
   int op_id;
   const void *last_api_func;
   const Eo_Op_Description *api_desc;
   Eo_Op_Description *op_desc;
   Eo_Op_Description *op_descs;

   op_id = klass->base_id;
   op_descs = klass->desc->ops.descs;

   DBG("Set functions for class '%s':%p", klass->desc->name, klass);

   if (!op_descs) return EINA_TRUE;

   qsort((void*)op_descs, klass->desc->ops.count, sizeof(Eo_Op_Description), eo_api_funcs_cmp);

   last_api_func = NULL;
   for (op_desc = op_descs; op_desc->op_type != EO_OP_TYPE_INVALID; op_desc++)
     {
        if(op_desc->api_func == NULL)
          {
             ERR("Class '%s': NULL API not allowed (%d NULL->%p '%s').",
                 klass->desc->name, op_desc->op, op_desc->func, op_desc->doc);
             return EINA_FALSE;
          }

        if (op_desc->op == EO_NOOP)
          {
             if (op_desc->api_func == last_api_func)
               {
                  ERR("Class '%s': API previously defined (%d %p->%p '%s').",
                      klass->desc->name, op_desc->op, op_desc->api_func, op_desc->func, op_desc->doc);
                  return EINA_FALSE;
               }
             op_desc->op = op_id;
             op_id++;
          }
        else if (op_desc->op == EO_OP_OVERRIDE)
          {
#ifdef _WIN32
             api_desc = _eo_api_desc_get(op_desc->api_func, klass->parent, klass->extensions, op_desc->api_name);
#else
             api_desc = _eo_api_desc_get(op_desc->api_func, klass->parent, klass->extensions, NULL);
#endif

             if (api_desc == NULL)
               {
                  ERR("Class '%s': Can't find api func description in class hierarchy (%p->%p) (%s).",
                      klass->desc->name, op_desc->api_func, op_desc->func, op_desc->doc);
                  return EINA_FALSE;
               }

             op_desc->op = api_desc->op;
             op_desc->doc = api_desc->doc;
          }

        DBG(" %4d %p->%p '%s'", op_desc->op, op_desc->api_func, op_desc->func, op_desc->doc);

        if (!_dich_func_set(klass, op_desc->op, op_desc->func))
          return EINA_FALSE;

        last_api_func = op_desc->api_func;
     }

   return EINA_TRUE;
}

EAPI Eo *
_eo_add_internal_start(const char *file, int line, const Eo_Class *klass_id, Eo *parent_id, Eina_Bool ref)
{
   _Eo_Object *obj;

   EO_CLASS_POINTER_RETURN_VAL(klass_id, klass, NULL);

   if (parent_id)
     {
        EO_OBJ_POINTER_RETURN_VAL(parent_id, parent, NULL);
     }

   if (EINA_UNLIKELY(klass->desc->type != EO_CLASS_TYPE_REGULAR))
     {
        ERR("in %s:%d: Class '%s' is not instantiate-able. Aborting.", file, line, klass->desc->name);
        return NULL;
     }

   eina_spinlock_take(&klass->objects.trash_lock);
   obj = eina_trash_pop(&klass->objects.trash);
   if (obj)
     {
        memset(obj, 0, klass->obj_size);
        klass->objects.trash_count--;
     }
   else
     {
        obj = calloc(1, klass->obj_size);
     }
   eina_spinlock_release(&klass->objects.trash_lock);

   obj->refcount++;
   obj->klass = klass;

#ifndef HAVE_EO_ID
   EINA_MAGIC_SET((Eo_Base *) obj, EO_EINA_MAGIC);
#endif
   obj->header.id = _eo_id_allocate(obj);
   Eo *eo_id = _eo_id_get(obj);

   _eo_condtor_reset(obj);

   _eo_ref(obj);

   eo_do(eo_id, eo_parent_set(parent_id));

   /* If there's a parent. Unref. Eo_add should return an object with either a
    * parent ref, or with the lack of, just a ref. */
     {
        Eo *parent_tmp;
        if (!ref && eo_do_ret(eo_id, parent_tmp, eo_parent_get()))
          {
             _eo_unref(obj);
          }
     }

   return eo_id;
}

Eo *
_eo_add_internal_end(Eo *eo_id)
{
   Eo_Stack_Frame *fptr;
   Eo_Call_Stack *stack = _eo_call_stack_get(eina_main_loop_is());

   fptr = stack->frame_ptr;

   if ((fptr == NULL) || (fptr->eo_id != eo_id))
     {
        ERR("Something very wrong happend to the call stack.");
        return NULL;
     }

   if (EINA_UNLIKELY(!fptr->o.obj))
     {
        ERR("Corrupt call stuck, shouldn't happen, please report!");
        return NULL;
     }

   if (!fptr->o.obj->condtor_done || fptr->o.obj->do_error)
     {
        const _Eo_Class *klass = (fptr->cur_klass) ?
           fptr->cur_klass : fptr->o.obj->klass;
        ERR("Object of class '%s' - Not all of the object constructors have been executed.",
            klass->desc->name);
        /* Unref twice, once for the ref in _eo_add_internal_start, and once for the basic object ref. */
        _eo_unref(fptr->o.obj);
        _eo_unref(fptr->o.obj);
        return NULL;
     }

   fptr->o.obj->finalized = EINA_TRUE;

   _eo_unref(fptr->o.obj);

   return (Eo *)eo_id;
}

EAPI Eo *
_eo_add_end(void)
{
   Eo *ret = eo_finalize();
   _eo_do_end();
   return ret;
}

/*****************************************************************************/

#define _EO_OP_ERR_NO_OP_PRINT(file, line, op, klass) \
   do \
      { \
         const _Eo_Class *op_klass = _eo_op_class_get(op); \
         const char *_dom_name = (op_klass) ? op_klass->desc->name : NULL; \
         ERR("in %s:%d: Can't execute function %s:%s (op 0x%x) for class '%s'. Aborting.", \
               file, line, _dom_name, _eo_op_id_name_get(op), op, \
               (klass) ? klass->desc->name : NULL); \
      } \
   while (0)

EAPI const Eo_Class *
eo_class_get(const Eo *eo_id)
{
   if (_eo_is_a_class(eo_id))
     {
        EO_CLASS_POINTER_RETURN_VAL(eo_id, _klass, NULL);
        return EO_ABSTRACT_CLASS_CLASS;
     }

   EO_OBJ_POINTER_RETURN_VAL(eo_id, obj, NULL);

   if (obj->klass)
      return _eo_class_id_get(obj->klass);
   return NULL;
}

EAPI const char *
eo_class_name_get(const Eo_Class *eo_id)
{
   const _Eo_Class *klass;

   if (_eo_is_a_class(eo_id))
     {
        EO_CLASS_POINTER_RETURN_VAL(eo_id, _klass, NULL);
        klass = _klass;
     }
     else
     {
        EO_OBJ_POINTER_RETURN_VAL(eo_id, obj, NULL);
        klass = obj->klass;
     }

   return klass->desc->name;
}

static void
_eo_class_base_op_init(_Eo_Class *klass)
{
   const Eo_Class_Description *desc = klass->desc;

   klass->base_id = _eo_ops_last_id;

   _eo_ops_last_id += desc->ops.count + 1;

   klass->chain_size = DICH_CHAIN1(_eo_ops_last_id) + 1;
   klass->chain = calloc(klass->chain_size, sizeof(*klass->chain));
}

#ifdef EO_DEBUG
static Eina_Bool
_eo_class_mro_has(const _Eo_Class *klass, const _Eo_Class *find)
{
   const _Eo_Class **itr;
   for (itr = klass->mro ; *itr ; itr++)
     {
        if (*itr == find)
          {
             return EINA_TRUE;
          }
     }
   return EINA_FALSE;
}
#endif

static Eina_List *
_eo_class_list_remove_duplicates(Eina_List* list)
{
   Eina_List *itr1, *itr2, *itr2n;

   itr1 = eina_list_last(list);
   while (itr1)
     {
        itr2 = eina_list_prev(itr1);

        while (itr2)
          {
             itr2n = eina_list_prev(itr2);

             if (eina_list_data_get(itr1) == eina_list_data_get(itr2))
               {
                  list = eina_list_remove_list(list, itr2);
               }

             itr2 = itr2n;
          }

        itr1 = eina_list_prev(itr1);
     }

   return list;
}

static Eina_List *
_eo_class_mro_add(Eina_List *mro, const _Eo_Class *klass)
{
   if (!klass)
     return mro;

   mro = eina_list_append(mro, klass);

   /* Recursively add MIXINS extensions. */
     {
        const _Eo_Class **extn_itr;

        for (extn_itr = klass->extensions ; *extn_itr ; extn_itr++)
          {
             const _Eo_Class *extn = *extn_itr;
             if (extn->desc->type == EO_CLASS_TYPE_MIXIN)
               mro = _eo_class_mro_add(mro, extn);
          }
     }

   mro = _eo_class_mro_add(mro, klass->parent);

   return mro;
}

static Eina_List *
_eo_class_mro_init(const Eo_Class_Description *desc, const _Eo_Class *parent, Eina_List *extensions)
{
   Eina_List *mro = NULL;
   Eina_List *extn_itr = NULL;
   Eina_List *extn_pos = NULL;
   const _Eo_Class *extn = NULL;

   /* Add MIXINS extensions. */
   EINA_LIST_FOREACH(extensions, extn_itr, extn)
     {
        if (extn->desc->type != EO_CLASS_TYPE_MIXIN)
          continue;

        mro = _eo_class_mro_add(mro, extn);
        extn_pos = eina_list_append(extn_pos, eina_list_last(mro));
     }

   /* Check if we can create a consistent mro */
     {
        Eina_List *itr = extn_pos;
        EINA_LIST_FOREACH(extensions, extn_itr, extn)
          {
             if (extn->desc->type != EO_CLASS_TYPE_MIXIN)
                continue;

             /* Get the first one after the extension. */
             Eina_List *extn_list = eina_list_next(eina_list_data_get(itr));

             /* If we found the extension again. */
             if (eina_list_data_find_list(extn_list, extn))
               {
                  eina_list_free(mro);
                  eina_list_free(extn_pos);
                  ERR("Cannot create a consistent method resolution order for class '%s' because of '%s'.", desc->name, extn->desc->name);
                  return NULL;
               }

             itr = eina_list_next(itr);
          }
     }

   eina_list_free(extn_pos);

   mro = _eo_class_mro_add(mro, parent);
   mro = _eo_class_list_remove_duplicates(mro);
   /* Will be replaced with the actual class pointer */
   mro = eina_list_prepend(mro, NULL);

   return mro;
}

static void
_eo_class_constructor(_Eo_Class *klass)
{
   if (klass->constructed)
     return;

   klass->constructed = EINA_TRUE;

   if (klass->desc->class_constructor)
     klass->desc->class_constructor(_eo_class_id_get(klass));
}

static void
eo_class_free(_Eo_Class *klass)
{
   void *data;

   if (klass->constructed)
     {
        if (klass->desc->class_destructor)
           klass->desc->class_destructor(_eo_class_id_get(klass));

        _dich_func_clean_all(klass);
     }

   EINA_TRASH_CLEAN(&klass->objects.trash, data)
      free(data);

   EINA_TRASH_CLEAN(&klass->iterators.trash, data)
      free(data);

   eina_spinlock_free(&klass->objects.trash_lock);
   eina_spinlock_free(&klass->iterators.trash_lock);

   free(klass);
}

/* Not really called, just used for the ptr... */
static void
_eo_class_isa_func(Eo *eo_id EINA_UNUSED, void *class_data EINA_UNUSED, va_list *list EINA_UNUSED)
{
   /* Do nonthing. */
}

EAPI const Eo_Class *
eo_class_new(const Eo_Class_Description *desc, const Eo_Class *parent_id, ...)
{
   _Eo_Class *klass;
   va_list p_list;
   size_t extn_sz, mro_sz, mixins_sz;
   Eina_List *extn_list, *mro, *mixins;

   EINA_SAFETY_ON_NULL_RETURN_VAL(desc, NULL);
   EINA_SAFETY_ON_NULL_RETURN_VAL(desc->name, NULL);

   _Eo_Class *parent = _eo_class_pointer_get(parent_id);
#ifndef HAVE_EO_ID
   if (parent && !EINA_MAGIC_CHECK((Eo_Base *) parent, EO_CLASS_EINA_MAGIC))
     {
        EINA_MAGIC_FAIL((Eo_Base *) parent, EO_CLASS_EINA_MAGIC);
        return NULL;
     }
#endif

   /* Check restrictions on Interface types. */
   if (desc->type == EO_CLASS_TYPE_INTERFACE)
     {
        EINA_SAFETY_ON_FALSE_RETURN_VAL(!desc->data_size, NULL);
     }

   /* Check parent */
   if (parent)
     {
        /* Verify the inheritance is allowed. */
        switch (desc->type)
          {
           case EO_CLASS_TYPE_REGULAR:
           case EO_CLASS_TYPE_REGULAR_NO_INSTANT:
              if ((parent->desc->type != EO_CLASS_TYPE_REGULAR) &&
                    (parent->desc->type != EO_CLASS_TYPE_REGULAR_NO_INSTANT))
                {
                   ERR("Regular classes ('%s') aren't allowed to inherit from non-regular classes ('%s').",
                       desc->name, parent->desc->name);
                   return NULL;
                }
              break;
           case EO_CLASS_TYPE_INTERFACE:
           case EO_CLASS_TYPE_MIXIN:
              if ((parent->desc->type != EO_CLASS_TYPE_INTERFACE) &&
                    (parent->desc->type != EO_CLASS_TYPE_MIXIN))
                {
                   ERR("Non-regular classes ('%s') aren't allowed to inherit from regular classes ('%s').",
                       desc->name, parent->desc->name);
                   return NULL;
                }
              break;
          }
     }

   /* Build class extensions list */
     {
        DBG("Started building extensions list for class '%s'", desc->name);
        extn_list = NULL;
        const _Eo_Class *extn = NULL;
        const Eo_Id *extn_id = NULL;

        va_start(p_list, parent_id);

        extn_id = va_arg(p_list, Eo_Id *);
        while (extn_id)
          {
             extn = _eo_class_pointer_get((Eo_Class *)extn_id);
             switch (extn->desc->type)
               {
                case EO_CLASS_TYPE_REGULAR_NO_INSTANT:
                case EO_CLASS_TYPE_REGULAR:
                case EO_CLASS_TYPE_INTERFACE:
                case EO_CLASS_TYPE_MIXIN:
                   extn_list = eina_list_append(extn_list, extn);
                   break;
               }

             extn_id = va_arg(p_list, Eo_Id *);
          }

        va_end(p_list);

        extn_list = _eo_class_list_remove_duplicates(extn_list);

        extn_sz = sizeof(_Eo_Class *) * (eina_list_count(extn_list) + 1);

        DBG("Finished building extensions list for class '%s'", desc->name);
     }

   /* Prepare mro list */
     {
        DBG("Started building MRO list for class '%s'", desc->name);

        mro = _eo_class_mro_init(desc, parent, extn_list);
        if (!mro)
          {
             eina_list_free(extn_list);
             return NULL;
          }

        mro_sz = sizeof(_Eo_Class *) * (eina_list_count(mro) + 1);

        DBG("Finished building MRO list for class '%s'", desc->name);
     }

   /* Prepare mixins list */
     {
        Eina_List *itr;
        const _Eo_Class *kls_itr;

        DBG("Started building Mixins list for class '%s'", desc->name);

        mixins = NULL;
        EINA_LIST_FOREACH(mro, itr, kls_itr)
          {
             if ((kls_itr) && (kls_itr->desc->type == EO_CLASS_TYPE_MIXIN) &&
                   (kls_itr->desc->data_size > 0))
               mixins = eina_list_append(mixins, kls_itr);
          }

        mixins_sz = sizeof(Eo_Extension_Data_Offset) * (eina_list_count(mixins) + 1);
        if ((desc->type == EO_CLASS_TYPE_MIXIN) && (desc->data_size > 0))
          mixins_sz += sizeof(Eo_Extension_Data_Offset);

        DBG("Finished building Mixins list for class '%s'", desc->name);
     }

   klass = calloc(1, _eo_class_sz + extn_sz + mro_sz + mixins_sz);
#ifndef HAVE_EO_ID
   EINA_MAGIC_SET((Eo_Base *) klass, EO_CLASS_EINA_MAGIC);
#endif
   eina_spinlock_new(&klass->objects.trash_lock);
   eina_spinlock_new(&klass->iterators.trash_lock);
   klass->parent = parent;
   klass->desc = desc;
   klass->extensions = (const _Eo_Class **) ((char *) klass + _eo_class_sz);
   klass->mro = (const _Eo_Class **) ((char *) klass->extensions + extn_sz);
   klass->extn_data_off = (Eo_Extension_Data_Offset *) ((char *) klass->mro + mro_sz);
   if (klass->parent)
     {
        /* FIXME: Make sure this alignment is enough. */
        klass->data_offset = klass->parent->data_offset +
           EO_ALIGN_SIZE(klass->parent->desc->data_size);
     }

   mro = eina_list_remove(mro, NULL);
   mro = eina_list_prepend(mro, klass);
   if ((desc->type == EO_CLASS_TYPE_MIXIN) && (desc->data_size > 0))
     mixins = eina_list_prepend(mixins, klass);

   /* Copy the extensions and free the list */
     {
        const _Eo_Class *extn = NULL;
        const _Eo_Class **extn_itr = klass->extensions;
        EINA_LIST_FREE(extn_list, extn)
          {
             *(extn_itr++) = extn;

             DBG("Added '%s' extension", extn->desc->name);
          }
        *(extn_itr) = NULL;
     }

   /* Copy the mro and free the list. */
     {
        const _Eo_Class *kls_itr = NULL;
        const _Eo_Class **mro_itr = klass->mro;
        EINA_LIST_FREE(mro, kls_itr)
          {
             *(mro_itr++) = kls_itr;

             DBG("Added '%s' to MRO", kls_itr->desc->name);
          }
        *(mro_itr) = NULL;
     }

   size_t extn_data_off = klass->data_offset;
   if (klass->desc->type != EO_CLASS_TYPE_MIXIN)
      extn_data_off += EO_ALIGN_SIZE(klass->desc->data_size);

   /* Feed the mixins data offsets and free the mixins list. */
     {
        const _Eo_Class *kls_itr = NULL;
        Eo_Extension_Data_Offset *extn_data_itr = klass->extn_data_off;
        EINA_LIST_FREE(mixins, kls_itr)
          {
             extn_data_itr->klass = kls_itr;
             extn_data_itr->offset = extn_data_off;

             extn_data_off += EO_ALIGN_SIZE(extn_data_itr->klass->desc->data_size);
             extn_data_itr++;

             DBG("Added '%s' to Data Offset info", kls_itr->desc->name);
          }
        extn_data_itr->klass = 0;
        extn_data_itr->offset = 0;
     }

   klass->obj_size = _eo_sz + extn_data_off;
   if (getenv("EO_DEBUG"))
     {
        fprintf(stderr, "Eo class '%s' will take %u bytes per object.\n",
                desc->name, klass->obj_size);
     }

   _eo_class_base_op_init(klass);

   /* Flatten the function array */
     {
        const _Eo_Class **mro_itr = klass->mro;
        for (  ; *mro_itr ; mro_itr++)
           ;

        /* Skip ourselves. */
        for ( mro_itr-- ; mro_itr > klass->mro ; mro_itr--)
          {
             _dich_copy_all(klass, *mro_itr);
          }
     }

   /* Mark which classes we implement */
     {
        const _Eo_Class **extn_itr;

        for (extn_itr = klass->extensions ; *extn_itr ; extn_itr++)
          {
             const _Eo_Class *extn = *extn_itr;
             /* Set it in the dich. */
             _dich_func_set(klass, extn->base_id +
                   extn->desc->ops.count, _eo_class_isa_func);
          }

        _dich_func_set(klass, klass->base_id + klass->desc->ops.count,
              _eo_class_isa_func);

        if (klass->parent)
          {
             _dich_func_set(klass,
                   klass->parent->base_id + klass->parent->desc->ops.count,
                   _eo_class_isa_func);
          }
     }

   if (!_eo_class_funcs_set(klass))
     {
        eina_spinlock_free(&klass->objects.trash_lock);
        eina_spinlock_free(&klass->iterators.trash_lock);
        _dich_func_clean_all(klass);
        free(klass);
        return NULL;
     }

   eina_spinlock_take(&_eo_class_creation_lock);
   klass->header.id = ++_eo_classes_last_id | MASK_CLASS_TAG;
     {
        /* FIXME: Handle errors. */
        size_t arrsize = _eo_classes_last_id * sizeof(*_eo_classes);
        _Eo_Class **tmp;
        tmp = realloc(_eo_classes, arrsize);

        /* If it's the first allocation, memset. */
        if (!_eo_classes)
           memset(tmp, 0, arrsize);

        _eo_classes = tmp;
        _eo_classes[_UNMASK_ID(klass->header.id) - 1] = klass;
     }
   eina_spinlock_release(&_eo_class_creation_lock);

   _eo_class_constructor(klass);

   DBG("Finished building class '%s'", klass->desc->name);



   const Eo_Event_Description **descs = klass->desc->events;
   /*add to the hash table*/
   for(; descs && *descs  ;descs++){
        eo_base_regular_set_counter_description(*descs);
        DBG("adding event %s class %s\n", (*descs)->name,  klass->desc->name);
   }

   return _eo_class_id_get(klass);
}

EAPI Eina_Bool
eo_isa(const Eo *eo_id, const Eo_Class *klass_id)
{
   EO_OBJ_POINTER_RETURN_VAL(eo_id, obj, EINA_FALSE);
   EO_CLASS_POINTER_RETURN_VAL(klass_id, klass, EINA_FALSE);
   const op_type_funcs *func = _dich_func_get(obj->klass,
         klass->base_id + klass->desc->ops.count);

   /* Currently implemented by reusing the LAST op id. Just marking it with
    * _eo_class_isa_func. */
   return (func && (func->func == _eo_class_isa_func));
}

EAPI Eo *
eo_xref_internal(const char *file, int line, Eo *obj_id, const Eo *ref_obj_id)
{
   EO_OBJ_POINTER_RETURN_VAL(obj_id, obj, obj_id);

   _eo_ref(obj);

#ifdef EO_DEBUG
   Eo_Xref_Node *xref = calloc(1, sizeof(*xref));
   xref->ref_obj = ref_obj_id;
   xref->file = file;
   xref->line = line;

   obj->xrefs = eina_inlist_prepend(obj->xrefs, EINA_INLIST_GET(xref));
#else
   (void) ref_obj_id;
   (void) file;
   (void) line;
#endif

   return obj_id;
}

EAPI void
eo_xunref(Eo *obj_id, const Eo *ref_obj_id)
{
   EO_OBJ_POINTER_RETURN(obj_id, obj);
#ifdef EO_DEBUG
   Eo_Xref_Node *xref = NULL;
   EINA_INLIST_FOREACH(obj->xrefs, xref)
     {
        if (xref->ref_obj == ref_obj_id)
          break;
     }

   if (xref)
     {
        obj->xrefs = eina_inlist_remove(obj->xrefs, EINA_INLIST_GET(xref));
        free(xref);
     }
   else
     {
        ERR("ref_obj (%p) does not reference obj (%p). Aborting unref.", ref_obj_id, obj_id);
        return;
     }
#else
   (void) ref_obj_id;
#endif
   _eo_unref(obj);
}

EAPI Eo *
eo_ref(const Eo *obj_id)
{
   EO_OBJ_POINTER_RETURN_VAL(obj_id, obj, (Eo *)obj_id);

   _eo_ref(obj);
   return (Eo *)obj_id;
}

EAPI void
eo_unref(const Eo *obj_id)
{
   EO_OBJ_POINTER_RETURN(obj_id, obj);

   _eo_unref(obj);
}

EAPI void
eo_del(const Eo *obj)
{
   Eo *parent_tmp;
   if (eo_do_ret(obj, parent_tmp, eo_parent_get()))
     {
        eo_do(obj, eo_parent_set(NULL));
     }
   else
     {
        eo_unref(obj);
     }
}

EAPI int
eo_ref_get(const Eo *obj_id)
{
   EO_OBJ_POINTER_RETURN_VAL(obj_id, obj, 0);

   return obj->refcount;
}

EAPI void
eo_error_set_internal(const Eo *obj_id, const char *file, int line)
{
   EO_OBJ_POINTER_RETURN(obj_id, obj);

   ERR("Error with obj '%p' at %s:%d.", obj, file, line);

   obj->do_error = EINA_TRUE;
}

void
_eo_condtor_done(Eo *obj_id)
{
   EO_OBJ_POINTER_RETURN(obj_id, obj);
   if (obj->condtor_done)
     {
        ERR("Object %p is already constructed at this point.", obj);
        return;
     }

   obj->condtor_done = EINA_TRUE;
}

static inline void *
_eo_data_scope_get(const _Eo_Object *obj, const _Eo_Class *klass)
{
   if (EINA_LIKELY((klass->desc->data_size > 0) && (klass->desc->type != EO_CLASS_TYPE_MIXIN)))
     return ((char *) obj) + _eo_sz + klass->data_offset;

   if (EINA_UNLIKELY(klass->desc->data_size == 0))
     return NULL;
   else

     {
        Eo_Extension_Data_Offset *doff_itr = obj->klass->extn_data_off;

        if (!doff_itr)
          return NULL;

        while (doff_itr->klass)
          {
             if (doff_itr->klass == klass)
               return ((char *) obj) + _eo_sz + doff_itr->offset;
             doff_itr++;
          }
     }

   return NULL;
}

static inline void *
_eo_data_xref_internal(const char *file, int line, _Eo_Object *obj, const _Eo_Class *klass, const _Eo_Object *ref_obj)
{
   void *data = NULL;
   if (klass != NULL)
     {
        data = _eo_data_scope_get(obj, klass);
        if (data == NULL) return NULL;
     }
   (obj->datarefcount)++;
#ifdef EO_DEBUG
   Eo_Xref_Node *xref = calloc(1, sizeof(*xref));
   xref->ref_obj = _eo_id_get(ref_obj);
   xref->file = file;
   xref->line = line;

   obj->data_xrefs = eina_inlist_prepend(obj->data_xrefs, EINA_INLIST_GET(xref));
#else
   (void) ref_obj;
   (void) file;
   (void) line;
#endif
   return data;
}

static inline void
_eo_data_xunref_internal(_Eo_Object *obj, void *data, const _Eo_Object *ref_obj)
{
#ifdef EO_DEBUG
   const _Eo_Class *klass = obj->klass;
   Eina_Bool in_range = (((char *)data >= (((char *) obj) + _eo_sz)) &&
                         ((char *)data < (((char *) obj) + klass->obj_size)));
   if (!in_range)
     {
        ERR("Data %p is not in the data range of the object %p (%s).", data, (Eo *)obj->headr.id, obj->klass->desc->name);
     }
#else
   (void) data;
#endif
   if (obj->datarefcount == 0)
     {
        ERR("Data for object %zx (%s) is already not referenced.", (size_t)_eo_id_get(obj), obj->klass->desc->name);
     }
   else
     {
        (obj->datarefcount)--;
     }
#ifdef EO_DEBUG
   Eo_Xref_Node *xref = NULL;
   EINA_INLIST_FOREACH(obj->data_xrefs, xref)
     {
        if (xref->ref_obj == _eo_id_get(ref_obj))
          break;
     }

   if (xref)
     {
        obj->data_xrefs = eina_inlist_remove(obj->data_xrefs, EINA_INLIST_GET(xref));
        free(xref);
     }
   else
     {
        ERR("ref_obj (0x%zx) does not reference data (%p) of obj (0x%zx).", (size_t)_eo_id_get(ref_obj), data, (size_t)_eo_id_get(obj));
     }
#else
   (void) ref_obj;
#endif
}

EAPI void *
eo_data_get(const Eo *obj_id, const Eo_Class *klass_id)
{
   return eo_data_scope_get(obj_id, klass_id);
}

EAPI void *
eo_data_scope_get(const Eo *obj_id, const Eo_Class *klass_id)
{
   void *ret;
   EO_OBJ_POINTER_RETURN_VAL(obj_id, obj, NULL);
   EO_CLASS_POINTER_RETURN_VAL(klass_id, klass, NULL);

#ifdef EO_DEBUG
   if (!_eo_class_mro_has(obj->klass, klass))
     {
        ERR("Tried getting data of class '%s' from object of class '%s', but the former is not a direct inheritance of the latter.", klass->desc->name, obj->klass->desc->name);
        return NULL;
     }
#endif

   ret = _eo_data_scope_get(obj, klass);

#ifdef EO_DEBUG
   if (!ret && (klass->desc->data_size == 0))
     {
        ERR("Tried getting data of class '%s', but it has none.", klass->desc->name);
     }
#endif

   return ret;
}

EAPI void *
eo_data_xref_internal(const char *file, int line, const Eo *obj_id, const Eo_Class *klass_id, const Eo *ref_obj_id)
{
   void *ret;
   EO_OBJ_POINTER_RETURN_VAL(obj_id, obj, NULL);
   EO_OBJ_POINTER_RETURN_VAL(ref_obj_id, ref_obj, NULL);
   _Eo_Class *klass = NULL;
   if (klass_id)
     {
        EO_CLASS_POINTER_RETURN_VAL(klass_id, klass2, NULL);
        klass = klass2;

#ifdef EO_DEBUG
        if (!_eo_class_mro_has(obj->klass, klass))
          {
             ERR("Tried getting data of class '%s' from object of class '%s', but the former is not a direct inheritance of the latter.", klass->desc->name, obj->klass->desc->name);
             return NULL;
          }
#endif
     }

   ret = _eo_data_xref_internal(file, line, obj, klass, ref_obj);

#ifdef EO_DEBUG
   if (klass && !ret && (klass->desc->data_size == 0))
     {
        ERR("Tried getting data of class '%s', but it has none.", klass->desc->name);
     }
#endif

   return ret;
}

EAPI void
eo_data_xunref_internal(const Eo *obj_id, void *data, const Eo *ref_obj_id)
{
   EO_OBJ_POINTER_RETURN(obj_id, obj);
   EO_OBJ_POINTER_RETURN(ref_obj_id, ref_obj);
   _eo_data_xunref_internal(obj, data, ref_obj);
}

EAPI Eina_Bool
eo_init(void)
{
   const char *log_dom = "eo";
   if (_eo_init_count++ > 0)
     return EINA_TRUE;

   eina_init();

   _eo_sz = EO_ALIGN_SIZE(sizeof(_Eo_Object));
   _eo_class_sz = EO_ALIGN_SIZE(sizeof(_Eo_Class));

   _eo_classes = NULL;
   _eo_classes_last_id = EO_CLASS_IDS_FIRST - 1;
   _eo_ops_last_id = EO_OP_IDS_FIRST;
   _eo_log_dom = eina_log_domain_register(log_dom, EINA_COLOR_LIGHTBLUE);
   if (_eo_log_dom < 0)
     {
        EINA_LOG_ERR("Could not register log domain: %s.", log_dom);
        return EINA_FALSE;
     }

   if (!eina_spinlock_new(&_eo_class_creation_lock))
     {
        EINA_LOG_ERR("Could not init lock.");
        return EINA_FALSE;
     }

   eina_magic_string_static_set(EO_EINA_MAGIC, EO_EINA_MAGIC_STR);
   eina_magic_string_static_set(EO_FREED_EINA_MAGIC,
                                EO_FREED_EINA_MAGIC_STR);
   eina_magic_string_static_set(EO_CLASS_EINA_MAGIC,
                                EO_CLASS_EINA_MAGIC_STR);

#ifdef EO_DEBUG
   /* Call it just for coverage purposes. Ugly I know, but I like it better than
    * casting everywhere else. */
   _eo_class_isa_func(NULL, NULL, NULL);
#endif

   eina_log_timing(_eo_log_dom,
                   EINA_LOG_STATE_STOP,
                   EINA_LOG_STATE_INIT);

   /* bootstrap EO_CLASS_CLASS */
   (void) EO_ABSTRACT_CLASS_CLASS;

   if (_eo_call_stack_key != 0)
     WRN("_eo_call_stack_key already set, this should not happen.");
   else
     {
        if (!eina_tls_cb_new(&_eo_call_stack_key, _eo_call_stack_free))
          {
             EINA_LOG_ERR("Could not create TLS key for call stack.");
             return EINA_FALSE;

          }
     }

   return EINA_TRUE;
}

EAPI Eina_Bool
eo_shutdown(void)
{
   size_t i;
   _Eo_Class **cls_itr = _eo_classes;

   if (--_eo_init_count > 0)
     return EINA_TRUE;

   eina_log_timing(_eo_log_dom,
                   EINA_LOG_STATE_START,
                   EINA_LOG_STATE_SHUTDOWN);

   for (i = 0 ; i < _eo_classes_last_id ; i++, cls_itr++)
     {
        if (*cls_itr)
          eo_class_free(*cls_itr);
     }

   if (_eo_classes)
     free(_eo_classes);

   eina_spinlock_free(&_eo_class_creation_lock);

   if (_eo_call_stack_key != 0)
     eina_tls_free(_eo_call_stack_key);

   _eo_free_ids_tables();

   eina_log_domain_unregister(_eo_log_dom);
   _eo_log_dom = -1;

   eina_shutdown();
   return EINA_TRUE;
}

EAPI Eina_Bool
eo_destructed_is(const Eo *obj_id)
{
   EO_OBJ_POINTER_RETURN_VAL(obj_id, obj, EINA_FALSE);

   return obj->destructed;
}

EAPI void
eo_manual_free_set(Eo *obj_id, Eina_Bool manual_free)
{
   EO_OBJ_POINTER_RETURN(obj_id, obj);
   obj->manual_free = manual_free;
}

EAPI Eina_Bool
eo_manual_free(Eo *obj_id)
{
   EO_OBJ_POINTER_RETURN_VAL(obj_id, obj, EINA_FALSE);

   if (EINA_FALSE == obj->manual_free)
     {
        ERR("Tried to manually free the object %p while the option has not been set; see eo_manual_free_set for more information.", obj);
        return EINA_FALSE;
     }

   if (!obj->destructed)
     {
        ERR("Tried deleting the object %p while still referenced(%d).", obj_id, obj->refcount);
        return EINA_FALSE;
     }

   _eo_free(obj);

   return EINA_TRUE;
}