[V8] Add a "fallback" mode for named property interceptors

By default interceptors are called before the normal property
resolution on objects.  When an interceptor is installed as a
"fallback" interceptor, it is only called if the object doesn't
already have the property.

In the case of a global object having an fallback interceptor,
the interceptor is not invoked at all for var or function
declarations.

Change-Id: Ibbd0a6b3ad4bd68a8d15ce99520e71c46ad14f84
Reviewed-by: Simon Hausmann <simon.hausmann@nokia.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/3rdparty/v8/src/api.cc b/src/3rdparty/v8/src/api.cc
index 4292238..06dc0ec 100644
--- a/src/3rdparty/v8/src/api.cc
+++ b/src/3rdparty/v8/src/api.cc
@@ -1123,6 +1123,7 @@ void FunctionTemplate::SetNamedInstancePropertyHandler(
       NamedPropertyQuery query,
       NamedPropertyDeleter remover,
       NamedPropertyEnumerator enumerator,
+      bool is_fallback,
       Handle<Value> data) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate,
@@ -1141,6 +1142,7 @@ void FunctionTemplate::SetNamedInstancePropertyHandler(
   if (query != 0) SET_FIELD_WRAPPED(obj, set_query, query);
   if (remover != 0) SET_FIELD_WRAPPED(obj, set_deleter, remover);
   if (enumerator != 0) SET_FIELD_WRAPPED(obj, set_enumerator, enumerator);
+  obj->set_is_fallback(i::Smi::FromInt(is_fallback));
 
   if (data.IsEmpty()) data = v8::Undefined();
   obj->set_data(*Utils::OpenHandle(*data));
@@ -1285,6 +1287,33 @@ void ObjectTemplate::SetNamedPropertyHandler(NamedPropertyGetter getter,
                                                         query,
                                                         remover,
                                                         enumerator,
+                                                        false,
+                                                        data);
+}
+
+
+void ObjectTemplate::SetFallbackPropertyHandler(NamedPropertyGetter getter,
+                                                NamedPropertySetter setter,
+                                                NamedPropertyQuery query,
+                                                NamedPropertyDeleter remover,
+                                                NamedPropertyEnumerator enumerator,
+                                                Handle<Value> data) {
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  if (IsDeadCheck(isolate, "v8::ObjectTemplate::SetNamedPropertyHandler()")) {
+    return;
+  }
+  ENTER_V8(isolate);
+  i::HandleScope scope(isolate);
+  EnsureConstructor(this);
+  i::FunctionTemplateInfo* constructor =
+      i::FunctionTemplateInfo::cast(Utils::OpenHandle(this)->constructor());
+  i::Handle<i::FunctionTemplateInfo> cons(constructor);
+  Utils::ToLocal(cons)->SetNamedInstancePropertyHandler(getter,
+                                                        setter,
+                                                        query,
+                                                        remover,
+                                                        enumerator,
+                                                        true,
                                                         data);
 }