klassOop typeArrayKlass::create_klass(BasicType type, int scale,
const char* name_str, TRAPS) {
typeArrayKlass o;
Symbol* sym = NULL;
if (name_str != NULL) {
sym = SymbolTable::new_symbol(name_str, CHECK_NULL);
}
KlassHandle klassklass (THREAD, Universe::typeArrayKlassKlassObj());
arrayKlassHandle k = base_create_array_klass(o.vtbl_value(), header_size(), klassklass, CHECK_NULL);
typeArrayKlass* ak = typeArrayKlass::cast(k());
ak->set_name(sym);
ak->set_layout_helper(array_layout_helper(type));
assert(scale == (1 << ak->log2_element_size()), "scale must check out");
assert(ak->oop_is_javaArray(), "sanity");
assert(ak->oop_is_typeArray(), "sanity");
ak->set_max_length(arrayOopDesc::max_array_length(type));
assert(k()->size() > header_size(), "bad size");
// Call complete_create_array_klass after all instance variables have been initialized.
KlassHandle super (THREAD, k->super());
complete_create_array_klass(k, super, CHECK_NULL);
return k();
}
TypeArrayKlass::TypeArrayKlass(BasicType type, Symbol* name) : ArrayKlass(name) {
set_layout_helper(array_layout_helper(type));
assert(oop_is_array(), "sanity");
assert(oop_is_typeArray(), "sanity");
set_max_length(arrayOopDesc::max_array_length(type));
assert(size() >= TypeArrayKlass::header_size(), "bad size");
set_class_loader_data(ClassLoaderData::the_null_class_loader_data());
}
jint Klass::array_layout_helper(BasicType etype) {
assert(etype >= T_BOOLEAN && etype <= T_OBJECT, "valid etype");
// Note that T_ARRAY is not allowed here.
int hsize = arrayOopDesc::base_offset_in_bytes(etype);
int esize = type2aelembytes(etype);
bool isobj = (etype == T_OBJECT);
int tag = isobj ? _lh_array_tag_obj_value : _lh_array_tag_type_value;
int lh = array_layout_helper(tag, hsize, etype, exact_log2(esize));
assert(lh < (int)_lh_neutral_value, "must look like an array layout");
assert(layout_helper_is_javaArray(lh), "correct kind");
assert(layout_helper_is_objArray(lh) == isobj, "correct kind");
assert(layout_helper_is_typeArray(lh) == !isobj, "correct kind");
assert(layout_helper_header_size(lh) == hsize, "correct decode");
assert(layout_helper_element_type(lh) == etype, "correct decode");
assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode");
return lh;
}
