Revert Dart_PropagateError until I can track down the problems in

runtime/lib/isolate.cc

Index: runtime/lib/isolate.cc
===================================================================
--- runtime/lib/isolate.cc	(revision 3821)
+++ runtime/lib/isolate.cc	(working copy)
@@ -81,8 +81,7 @@
 }
 
 
-// TODO(turnidge): Move to DartLibraryCalls.
-RawObject* ReceivePortCreate(intptr_t port_id) {
+RawInstance* ReceivePortCreate(intptr_t port_id) {
   const String& class_name =
       String::Handle(String::NewSymbol("ReceivePortImpl"));
   const String& function_name =
@@ -98,17 +97,18 @@
                               Resolver::kIsQualified));
   GrowableArray<const Object*> arguments(kNumArguments);
   arguments.Add(&Integer::Handle(Integer::New(port_id)));
-  const Object& result = Object::Handle(
+  const Instance& result = Instance::Handle(
       DartEntry::InvokeStatic(function, arguments, kNoArgumentNames));
-  if (!result.IsError()) {
+  if (result.IsError()) {
+    ProcessError(result);
+  } else {
     PortMap::SetLive(port_id);
   }
   return result.raw();
 }
 
 
-// TODO(turnidge): Move to DartLibraryCalls.
-static RawObject* SendPortCreate(intptr_t port_id) {
+static RawInstance* SendPortCreate(intptr_t port_id) {
   const String& class_name = String::Handle(String::NewSymbol("SendPortImpl"));
   const String& function_name = String::Handle(String::NewSymbol("_create"));
   const int kNumArguments = 1;
@@ -122,7 +122,7 @@
                               Resolver::kIsQualified));
   GrowableArray<const Object*> arguments(kNumArguments);
   arguments.Add(&Integer::Handle(Integer::New(port_id)));
-  const Object& result = Object::Handle(
+  const Instance& result = Instance::Handle(
       DartEntry::InvokeStatic(function, arguments, kNoArgumentNames));
   return result.raw();
 }
@@ -184,10 +184,7 @@
     // TODO(iposva): Proper error checking here.
     ASSERT(!target_function.IsNull());
     // TODO(iposva): Allocate the proper port number here.
-    const Object& local_port = Object::Handle(ReceivePortCreate(port_id));
-    if (local_port.IsError()) {
-      ProcessError(local_port);
-    }
+    const Instance& local_port = Instance::Handle(ReceivePortCreate(port_id));
     GrowableArray<const Object*> arguments(1);
     arguments.Add(&local_port);
     const Array& kNoArgumentNames = Array::Handle();
@@ -330,13 +327,16 @@
                         library_url,
                         class_name);
   }
-
-  // TODO(turnidge): Move this code up before we launch the new
-  // thread.  That way we won't have a thread hanging around that we
-  // can't talk to.
-  const Object& port = Object::Handle(SendPortCreate(port_id));
+  const Instance& port = Instance::Handle(SendPortCreate(port_id));
   if (port.IsError()) {
-    Exceptions::PropagateError(port);
+    if (port.IsUnhandledException()) {
+      ThrowErrorException(Exceptions::kInternalError,
+                          "Unable to create send port to isolate",
+                          library_url,
+                          class_name);
+    } else {
+      ProcessError(port);
+    }
   }
   arguments->SetReturn(port);
 }
@@ -346,10 +346,7 @@
   ASSERT(AbstractTypeArguments::CheckedHandle(arguments->At(0)).IsNull());
   intptr_t port_id =
       PortMap::CreatePort(arguments->isolate()->message_handler());
-  const Object& port = Object::Handle(ReceivePortCreate(port_id));
-  if (port.IsError()) {
-    Exceptions::PropagateError(port);
-  }
+  const Instance& port = Instance::Handle(ReceivePortCreate(port_id));
   arguments->SetReturn(port);
 }