OBJCRT_EXPORT Class objc_allocateClassPair(Class super, const char* name, size_t extraBytes) {
// Per API contract: If the class name already exists,
// the runtime refuses to create a new one.
if (objc_classname_to_class(name) != Nil) {
return Nil;
}
// allocate the metaclass and the class, back-to-back.
size_t size = sizeof(struct objc_class) + // Metaclass
OBJC_ID_PADDED(sizeof(struct objc_class)) + // Class + Alignment Padding
extraBytes;
Class newClasses = calloc(1, size);
newClasses[0].name = newClasses[1].name = _strdup(name);
newClasses[0].dtable = newClasses[1].dtable = empty_dtable;
newClasses[0].info |= OBJC_CLASS_INFO_METACLASS | OBJC_CLASS_INFO_CREATED_RUNTIME;
newClasses[1].info |= OBJC_CLASS_INFO_CLASS | OBJC_CLASS_INFO_CREATED_RUNTIME;
newClasses[1].superclass = super;
_object_setClass((id)&newClasses[1], &newClasses[0]);
return &newClasses[1];
}
void
objc_init_static_instances(struct objc_abi_symtab *symtab)
{
struct objc_abi_static_instances **si;
size_t i;
/* Check if the class for a static instance became available */
for (i = 0; i < static_instances_cnt; i++) {
Class cls = objc_lookup_class(static_instances[i]->class_name);
if (cls != Nil) {
id *instances;
for (instances = static_instances[i]->instances;
*instances != nil; instances++)
_object_setClass(*instances, cls);
static_instances_cnt--;
if (static_instances_cnt == 0) {
free(static_instances);
static_instances = NULL;
continue;
}
static_instances[i] =
static_instances[static_instances_cnt];
static_instances = realloc(static_instances,
sizeof(struct objc_abi_static_instances*) *
static_instances_cnt);
if (static_instances == NULL)
OBJC_ERROR("Not enough memory for list of "
"static instances!");
}
}
si = (struct objc_abi_static_instances**)
symtab->defs[symtab->cls_def_cnt + symtab->cat_def_cnt];
if (si == NULL)
return;
for (; *si != NULL; si++) {
Class cls = objc_lookup_class((*si)->class_name);
if (cls != Nil) {
id *instances;
for (instances = (*si)->instances; *instances != nil;
instances++)
_object_setClass(*instances, cls);
} else {
if (static_instances == NULL)
static_instances = malloc(sizeof(
struct objc_abi_static_instances*));
else
static_instances = realloc(static_instances,
sizeof(struct objc_abi_static_instances*) *
(static_instances_cnt + 1));
if (static_instances == NULL)
OBJC_ERROR("Not enough memory for list of "
"static instances!");
static_instances[static_instances_cnt++] = *si;
}
}
}
