Trigger exception debug event for promises at the throw site.

src/runtime.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 <limits>
 
 #include "v8.h"
 
 #include "accessors.h"
@@ skipping 5624 matching lines @@
   HandleScope scope(isolate);
   // When leaving the callback, step out has been activated, but not performed
   // if we do not leave the builtin.  To be able to step into the callback
   // again, we need to clear the step out at this point.
   debug->ClearStepOut();
   debug->FloodWithOneShot(callback);
   return isolate->heap()->undefined_value();
 }
 
 
-// Notify the debugger if an expcetion in a promise is not caught (yet).
-RUNTIME_FUNCTION(Runtime_DebugPendingExceptionInPromise) {
-  ASSERT(args.length() == 2);
+// The argument is a closure that is kept until the epilogue is called.
+// On exception, the closure is called, which returns the promise if the
+// exception is considered uncaught, or undefined otherwise.
+RUNTIME_FUNCTION(Runtime_DebugPromiseHandlePrologue) {
+  ASSERT(args.length() == 1);
   HandleScope scope(isolate);
-  CONVERT_ARG_HANDLE_CHECKED(Object, exception, 0);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 1);
-  isolate->debugger()->OnException(exception, true, promise);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, promise_getter, 0);
+  isolate->debug()->PromiseHandlePrologue(promise_getter);
   return isolate->heap()->undefined_value();
 }
 
+
+RUNTIME_FUNCTION(Runtime_DebugPromiseHandleEpilogue) {
+  ASSERT(args.length() == 0);
+  SealHandleScope shs(isolate);
+  isolate->debug()->PromiseHandleEpilogue();
+  return isolate->heap()->undefined_value();
+}
+
 
 // Set a local property, even if it is READ_ONLY.  If the property does not
 // exist, it will be added with attributes NONE.
 RUNTIME_FUNCTION(Runtime_IgnoreAttributesAndSetProperty) {
   HandleScope scope(isolate);
   RUNTIME_ASSERT(args.length() == 3 || args.length() == 4);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
   CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
   CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
   // Compute attributes.
@@ skipping 9475 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal