1 files changed, 30 insertions, 12 deletions

diff --git a/deps/v8/src/isolate.cc b/deps/v8/src/isolate.cc
index 215296d73..2905a0828 100644
--- a/deps/v8/src/isolate.cc
+++ b/deps/v8/src/isolate.cc
@@ -1090,19 +1090,30 @@ void Isolate::DoThrow(Object* exception, MessageLocation* location) {
         thread_local_top()->pending_message_end_pos_ = location->end_pos();
       }
 
-      // If the abort-on-uncaught-exception flag is specified, abort on any
-      // exception not caught by JavaScript, even when an external handler is
-      // present.  This flag is intended for use by JavaScript developers, so
-      // print a user-friendly stack trace (not an internal one).
+      // If the abort-on-uncaught-exception flag is specified, and if the
+      // exception is not caught by JavaScript (even when an external handler is
+      // present).
       if (fatal_exception_depth == 0 &&
-          FLAG_abort_on_uncaught_exception &&
+          (FLAG_abort_on_uncaught_exception) &&
           (report_exception || can_be_caught_externally)) {
-        fatal_exception_depth++;
-        PrintF(stderr,
-               "%s\n\nFROM\n",
-               MessageHandler::GetLocalizedMessage(this, message_obj).get());
-        PrintCurrentStackTrace(stderr);
-        base::OS::Abort();
+        // If the embedder didn't specify a custom uncaught exception callback,
+        // or if the custom callback determined that V8 should abort, then
+        // abort
+        bool should_abort = !abort_on_uncaught_exception_callback_ ||
+                             abort_on_uncaught_exception_callback_(
+                                 reinterpret_cast<v8::Isolate*>(this)
+                             );
+
+        if (should_abort) {
+          fatal_exception_depth++;
+          // This flag is intended for use by JavaScript developers, so
+          // print a user-friendly stack trace (not an internal one).
+          PrintF(stderr,
+                 "%s\n\nFROM\n",
+                 MessageHandler::GetLocalizedMessage(this, message_obj).get());
+          PrintCurrentStackTrace(stderr);
+          base::OS::Abort();
+        }
       }
     } else if (location != NULL && !location->script().is_null()) {
       // We are bootstrapping and caught an error where the location is set
@@ -1299,6 +1310,12 @@ void Isolate::SetCaptureStackTraceForUncaughtExceptions(
 }
 
 
+void Isolate::SetAbortOnUncaughtException(
+      v8::Isolate::abort_on_uncaught_exception_t callback) {
+  abort_on_uncaught_exception_callback_ = callback;
+}
+
+
 Handle<Context> Isolate::native_context() {
   return handle(context()->native_context());
 }
@@ -1474,7 +1491,8 @@ Isolate::Isolate()
       num_sweeper_threads_(0),
       stress_deopt_count_(0),
       next_optimization_id_(0),
-      use_counter_callback_(NULL) {
+      use_counter_callback_(NULL),
+      abort_on_uncaught_exception_callback_(NULL) {
   id_ = base::NoBarrier_AtomicIncrement(&isolate_counter_, 1);
   TRACE_ISOLATE(constructor);