Async/await catch prediction for "the synchronous case"

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 9fb3b44ec05d0b6d55e85cc1bb5fda06ea4b151d..4195378afc3e1dd35c670e0bcb53c5c69c06e9ad 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -675,6 +675,9 @@ class Isolate {
   void PopPromise();
   Handle<Object> GetPromiseOnStackOnThrow();
 
+  // Heuristically guess whether a Promise is handled by user catch handler

[jgruber, 2016/09/12 10:27:31]

Is this comment meant for PromiseHasUserDefinedRejectHandler? If yes, isn't it
somewhat misleading since that only reads and returns a property?

[Dan Ehrenberg, 2016/09/12 22:12:11]

Not sure what you mean; this function calls out to a function implemented in
JavaScript to do a dependency graph traversal to answer the question.

[jgruber, 2016/09/13 08:17:20]

You're right. Sorry, my mistake.

+  bool PromiseHasUserDefinedRejectHandler(Handle<Object> promise);
+
   class ExceptionScope {
    public:
     // Scope currently can only be used for regular exceptions,