Work in progress: allow pause-on-exceptions to work in Object.observe callbacks

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/v8.h"
@@ skipping 1372 matching lines @@
     return false;
   }
 
   // Reschedule the exception.
   thread_local_top()->scheduled_exception_ = pending_exception();
   clear_pending_exception();
   return true;
 }
 
 
-void Isolate::PushPromise(Handle<JSObject> promise) {
+void Isolate::PushPromise(Handle<Object> promise) {
   ThreadLocalTop* tltop = thread_local_top();
   PromiseOnStack* prev = tltop->promise_on_stack_;
   StackHandler* handler = StackHandler::FromAddress(Isolate::handler(tltop));
-  Handle<JSObject> global_handle =
-      Handle<JSObject>::cast(global_handles()->Create(*promise));
+  Handle<Object> global_handle = global_handles()->Create(*promise);
   tltop->promise_on_stack_ = new PromiseOnStack(handler, global_handle, prev);
 }
 
 
 void Isolate::PopPromise() {
   ThreadLocalTop* tltop = thread_local_top();
   if (tltop->promise_on_stack_ == NULL) return;
   PromiseOnStack* prev = tltop->promise_on_stack_->prev();
   Handle<Object> global_handle = tltop->promise_on_stack_->promise();
   delete tltop->promise_on_stack_;
@@ skipping 1087 matching lines @@
   if (prev_ && prev_->Intercept(flag)) return true;
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 } }  // namespace v8::internal