Handle creating ParameterMirrors for the parameters of forwarding constructors.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 7643cdbfc5ffc2cd79a4b1b9842a94c0f83fca24..612202cdbdfad71f7edd9764589c700f6d161847 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -2022,7 +2022,7 @@ void Class::set_type_parameters(const TypeArguments& value) const {
 
 
 intptr_t Class::NumTypeParameters(Isolate* isolate) const {
-  if (IsMixinApplication() && !is_mixin_type_applied()) {
+  if (IsAnonymousMixinApplication() && !is_mixin_type_applied()) {
     ClassFinalizer::ApplyMixinType(*this);
   }
   if (type_parameters() == TypeArguments::null()) {
@@ -2049,7 +2049,7 @@ intptr_t Class::NumOwnTypeArguments() const {
     set_num_own_type_arguments(num_type_params);
     return num_type_params;
   }
-  ASSERT(!IsMixinApplication() || is_mixin_type_applied());
+  ASSERT(!IsAnonymousMixinApplication() || is_mixin_type_applied());
   const AbstractType& sup_type = AbstractType::Handle(isolate, super_type());
   const TypeArguments& sup_type_args =
       TypeArguments::Handle(isolate, sup_type.arguments());
@@ -3186,13 +3186,15 @@ void Class::set_mixin(const Type& value) const {
 
 
 bool Class::IsMixinApplication() const {
-  return mixin() != Type::null();
+  return mixin() != Type::null() || is_mixin_app_alias();
 }
 
+
 bool Class::IsAnonymousMixinApplication() const {
   return IsMixinApplication() && !is_mixin_app_alias();
 }
 
+
 void Class::set_patch_class(const Class& cls) const {
   ASSERT(patch_class() == Class::null());
   StorePointer(&raw_ptr()->patch_class_, cls.raw());
@@ -5081,6 +5083,28 @@ void Function::SetRedirectionTarget(const Function& target) const {
 }
 
 
+bool Function::IsForwardingConstructor() const {
+  if (!IsImplicitConstructor()) return false;
+  const Class& owner = Class::Handle(Owner());
+  return owner.IsMixinApplication();
+}
+
+
+RawFunction* Function::ForwardingTarget() const {
+  ASSERT(IsForwardingConstructor());
+  Object& obj = Object::Handle(raw_ptr()->data_);
+  ASSERT(!obj.IsNull());
+  return Function::Cast(obj).raw();
+}
+
+
+void Function::SetForwardingTarget(const Function& target) const {
+  ASSERT(IsForwardingConstructor());
+  ASSERT(Object::Handle(raw_ptr()->data_).IsNull());
+  set_data(target);
+}
+
+
 void Function::set_data(const Object& value) const {
   StorePointer(&raw_ptr()->data_, value.raw());
 }