/** Add runtime type information to a "new" expression, if necessary. */
void mayAddRuntimeTypeToConstrutorOrFactoryCall(
ClassElement enclosingClass, DartNewExpression x, JsInvocation invoke) {
// TODO(johnlenz):in optimized mode, only add this where it is needed.
InterfaceType instanceType = Types.constructorType(x);
if (instanceType == null) {
// TODO(johnlenz): HackHack. Currently the "new FallThroughError" injected by the
// Normalizer does not have the instance type attached. But in this
// case we know it does not have any type parameters.
// reportError(x.getParent().getParent(), new AssertionError("missing type information"));
assert typeProvider
.getFallThroughError()
.getElement()
.lookupConstructor("")
.equals(x.getSymbol());
} else if (constructorHasTypeParameters(x)) {
ConstructorElement constructor = x.getSymbol();
ClassElement containingClassElement = enclosingClass;
if (constructor.getModifiers().isFactory()) {
// We are calling a factory, this is either in a class
FunctionType functionType = (FunctionType) constructor.getType();
JsExpression typeArgs =
generateTypeArgsArrayForFactory(functionType, instanceType, containingClassElement);
assert typeArgs != null;
invoke.getArguments().add(0, typeArgs);
} else {
ClassElement constructorClassElement = constructor.getConstructorType();
invoke
.getArguments()
.add(
0,
generateRTTLookup(constructorClassElement, instanceType, containingClassElement));
}
}
}
private JsExpression generateTypeArgsArrayForFactory(
FunctionType functionType, InterfaceType instanceType, ClassElement contextClassElement) {
JsExpression typeArgs;
if (inFactoryOrStatic(contextClassElement)) {
if (inFactory()) {
// When building a type list in a static context like a factory, type
// variables are
// resolved from the type parameters to the static method.
DartClassMember<?> member = context.getCurrentClassMember();
DartMethodDefinition containingMethod = (DartMethodDefinition) member;
ConstructorElement contextElement = (ConstructorElement) containingMethod.getSymbol();
typeArgs =
buildTypeArgsForFactory(
functionType,
instanceType,
((FunctionType) contextElement.getType()).getTypeVariables(),
buildFactoryTypeInfoReference());
} else {
typeArgs = buildTypeArgsForFactory(functionType, instanceType, null, null);
}
} else {
// Build type args in a class context:
// When building a type list in a class instance, type variables are
// resolved from the runtime type information on the instance of the
// object.
JsExpression typeArgContextExpr = buildTypeArgsReference(contextClassElement);
typeArgs =
buildTypeArgsForFactory(
functionType,
instanceType,
contextClassElement.getTypeParameters(),
typeArgContextExpr);
}
return typeArgs;
}
private boolean constructorHasTypeParameters(DartNewExpression x) {
ConstructorElement element = x.getSymbol();
if (element.getModifiers().isFactory()) {
return isParameterizedFactoryMethod((DartMethodDefinition) element.getNode());
} else {
InterfaceType instanceType = Types.constructorType(x);
return hasTypeParameters(instanceType.getElement());
}
}