Added support for isolate unhandled exceptions.

runtime/vm/exceptions.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/exceptions.h"
 
+#include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
 #include "vm/flags.h"
 #include "vm/object.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
 
 namespace dart {
 
@@ skipping 139 matching lines @@
   const GrowableObjectArray& pc_offset_list =
       GrowableObjectArray::Handle(GrowableObjectArray::New());
   bool handler_exists = FindExceptionHandler(&handler_pc,
                                              &handler_sp,
                                              &handler_fp,
                                              func_list,
                                              code_list,
                                              pc_offset_list);
   if (handler_pc == 0) {
     // There are no dart invocation frames on the stack so we do not
-    // have a caller to return to. This is a case where we would have
-    // to call the Isolate error handler and let it deal with the shutdown.
-    // We report an error and shutdown the process as a temporary solution
-    // until the isolate error handler stuff is implemented.
+    // have a caller to return to.
     ASSERT(!handler_exists);
-    OS::PrintErr("Exception '%s' thrown:\n", exception.ToCString());
-    OS::PrintErr("Exiting the process\n");
-    OS::Exit(255);
+    if (Isolate::UnhandledExceptionCallback() != NULL) {
+      // Notify embedder that an unhandled exception occurred.
+      Dart_EnterScope();
+      Dart_Handle error_handle = Api::NewHandle(Isolate::Current(),
+                                                incoming_exception.raw());
+      (Isolate::UnhandledExceptionCallback())(error_handle);
+      Dart_ExitScope();
+    } else {
+      OS::PrintErr("Exception '%s' thrown:\n", exception.ToCString());
+      OS::PrintErr("Shutting down the isolate\n");
+    }
+    Dart_ShutdownIsolate();
   }
   // TODO(5411263): At some point we can optimize by figuring out if a
   // stack trace is needed based on whether the catch code specifies a
   // stack trace object or there is a rethrow in the catch clause.
   Stacktrace& stacktrace = Stacktrace::Handle();
   if (pc_offset_list.Length() != 0) {
     if (existing_stacktrace.IsNull()) {
       stacktrace = Stacktrace::New(func_list, code_list, pc_offset_list);
     } else {
       stacktrace ^= existing_stacktrace.raw();
@@ skipping 254 matching lines @@
     case kIsolateSpawn:
       library = Library::IsolateLibrary();
       class_name = Symbols::New("IsolateSpawnException");
       break;
   }
 
   return DartLibraryCalls::ExceptionCreate(library, class_name, arguments);
 }
 
 }  // namespace dart