/* Look at this class and it's superclass contents (which includes
* included modules) and calculate out how to allocate the slots.
*
* This locks the class so that construction is serialized.
*/
void Class::auto_pack(STATE) {
hard_lock(state);
// If another thread did this work while we were waiting on the lock,
// don't redo it.
if(type_info_->type == PackedObject::type) return;
size_t slots = 0;
LookupTable* lt = LookupTable::create(state);
// If autopacking is enabled, figure out how many slots to use.
if(state->shared.config.gc_autopack) {
Module* mod = this;
int slot = 0;
while(!mod->nil_p()) {
Array* info = 0;
if(Class* cls = try_as<Class>(mod)) {
info = cls->seen_ivars();
} else if(IncludedModule* im = try_as<IncludedModule>(mod)) {
info = im->module()->seen_ivars();
}
if(info && !info->nil_p()) {
for(size_t i = 0; i < info->size(); i++) {
if(Symbol* sym = try_as<Symbol>(info->get(state, i))) {
bool found = false;
lt->fetch(state, sym, &found);
if(!found) {
lt->store(state, sym, Fixnum::from(slot++));
}
}
// Limit the number of packed ivars to 25.
if(slot > 25) break;
}
}
mod = mod->superclass();
}
slots = lt->entries()->to_native();
}
packed_size_ = sizeof(Object) + (slots * sizeof(Object*));
packed_ivar_info(state, lt);
set_object_type(state, PackedObject::type);
hard_unlock(state);
}
Object* Class::set_packed(STATE, Array* info) {
// Only transition Object typed objects to Packed
if(type_info_->type != Object::type) return Fixnum::from(1);
// Reject methods that already have packing.
if(packed_size_) return Fixnum::from(2);
LookupTable* lt = LookupTable::create(state);
size_t s = info->size();
for(size_t i = 0; i < s; i++) {
Symbol* sym = as<Symbol>(info->get(state, i));
lt->store(state, sym, Fixnum::from(i));
}
packed_size_ = sizeof(Object) + (s * sizeof(Object*));
packed_ivar_info(state, lt);
set_object_type(state, PackedObject::type);
return Qtrue;
}
Object* Class::set_superclass(STATE, Object* obj) {
if(obj->nil_p()) {
superclass(state, (Class*)Qnil);
return Qnil;
}
Class* sup;
if((sup = try_as<Class>(obj)) == 0) {
return Primitives::failure();
}
superclass(state, sup);
instance_type(state, sup->instance_type());
set_type_info(sup->type_info());
packed_ivar_info(state, sup->packed_ivar_info());
set_packed_size(sup->packed_size());
MetaClass::attach(state, this, sup->metaclass(state));
return Qnil;
}