MaybeDataType TypeConstraint::underlyingDataTypeResolved() const {
assert(!isSelf() && !isParent());
if (!hasConstraint()) return folly::none;
auto t = underlyingDataType();
// If we aren't a class or type alias, nothing special to do.
if (!isObjectOrTypeAlias()) return t;
auto p = getTypeAliasOrClassWithAutoload(m_namedEntity, m_typeName);
auto td = p.first;
auto c = p.second;
// See if this is a type alias.
if (td) {
if (td->kind != KindOfObject) {
t = td->kind;
} else {
c = td->klass;
}
}
// If the underlying type is a class, see if it is an enum and get that.
if (c && isEnum(c)) {
t = c->enumBaseTy();
}
return t;
}
bool
TypeConstraint::check(TypedValue* tv, const Func* func) const {
assert(hasConstraint());
// This is part of the interpreter runtime; perf matters.
if (tv->m_type == KindOfRef) {
tv = tv->m_data.pref->tv();
}
if (isNullable() && tv->m_type == KindOfNull) return true;
if (isNumber()) {
return IS_INT_TYPE(tv->m_type) || IS_DOUBLE_TYPE(tv->m_type);
}
if (tv->m_type == KindOfObject) {
if (!isObjectOrTypeAlias()) return false;
// Perfect match seems common enough to be worth skipping the hash
// table lookup.
if (m_typeName->isame(tv->m_data.pobj->getVMClass()->name())) {
if (shouldProfile()) InstanceBits::profile(m_typeName);
return true;
}
const Class *c = nullptr;
const bool selfOrParentOrCallable = isSelf() || isParent() || isCallable();
if (selfOrParentOrCallable) {
if (isSelf()) {
selfToClass(func, &c);
} else if (isParent()) {
parentToClass(func, &c);
} else {
assert(isCallable());
return f_is_callable(tvAsCVarRef(tv));
}
} else {
// We can't save the Class* since it moves around from request
// to request.
assert(m_namedEntity);
c = Unit::lookupClass(m_namedEntity);
}
if (shouldProfile() && c) {
InstanceBits::profile(c->preClass()->name());
}
if (c && tv->m_data.pobj->instanceof(c)) {
return true;
}
return !selfOrParentOrCallable && checkTypeAliasObj(tv);
}
if (isObjectOrTypeAlias()) {
switch (tv->m_type) {
case KindOfArray:
if (interface_supports_array(m_typeName)) {
return true;
}
break;
case KindOfString:
case KindOfStaticString:
if (interface_supports_string(m_typeName)) {
return true;
}
break;
case KindOfInt64:
if (interface_supports_int(m_typeName)) {
return true;
}
break;
case KindOfDouble:
if (interface_supports_double(m_typeName)) {
return true;
}
break;
default:
break;
}
if (isCallable()) {
return f_is_callable(tvAsCVarRef(tv));
}
return isPrecise() && checkTypeAliasNonObj(tv);
}
return equivDataTypes(m_type.dt, tv->m_type);
}
