Report promise reject with no handler (behind a flag).

src/api.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 "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 2050 matching lines @@
   ON_BAILOUT(isolate, "v8::Message::Get()", return Local<String>());
   ENTER_V8(isolate);
   EscapableHandleScope scope(reinterpret_cast<Isolate*>(isolate));
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::String> raw_result = i::MessageHandler::GetMessage(isolate, obj);
   Local<String> result = Utils::ToLocal(raw_result);
   return scope.Escape(result);
 }
 
 
+v8::Handle<v8::Promise> Message::GetPromise() const {
+  i::Handle<i::JSMessageObject> message =
+      i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
+  i::Object* promise = message->promise();
+  if (promise->IsUndefined()) return v8::Handle<v8::Promise>();
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  i::Handle<i::JSObject> promise_handle(i::JSObject::cast(promise), isolate);
+  return Utils::PromiseToLocal(promise_handle);
+}
+
+
 ScriptOrigin Message::GetScriptOrigin() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   i::Handle<i::JSMessageObject> message =
       i::Handle<i::JSMessageObject>::cast(Utils::OpenHandle(this));
   i::Handle<i::Object> script_wraper =
       i::Handle<i::Object>(message->script(), isolate);
   i::Handle<i::JSValue> script_value =
       i::Handle<i::JSValue>::cast(script_wraper);
   i::Handle<i::Script> script(i::Script::cast(script_value->value()));
   i::Handle<i::Object> scriptName(i::Script::GetNameOrSourceURL(script));
@@ skipping 3883 matching lines @@
       isolate,
       isolate->promise_then(),
       promise,
       arraysize(argv), argv,
       false).ToHandle(&result);
   EXCEPTION_BAILOUT_CHECK(isolate, Local<Promise>());
   return Local<Promise>::Cast(Utils::ToLocal(result));
 }
 
 
+bool Promise::HasRejectHandler() {
+  i::Handle<i::JSObject> promise = Utils::OpenHandle(this);
+  i::Isolate* isolate = promise->GetIsolate();
+  LOG_API(isolate, "Promise::HasRejectHandler");
+  ENTER_V8(isolate);
+  EXCEPTION_PREAMBLE(isolate);
+  i::Handle<i::Object> result;
+  has_pending_exception = !i::Execution::PromiseHasRejectHandler(
+                               isolate, promise).ToHandle(&result);
+  EXCEPTION_BAILOUT_CHECK(isolate, false);
+  return result->BooleanValue();
+}
+
+
 bool v8::ArrayBuffer::IsExternal() const {
   return Utils::OpenHandle(this)->is_external();
 }
 
 
 v8::ArrayBuffer::Contents v8::ArrayBuffer::Externalize() {
   i::Handle<i::JSArrayBuffer> obj = Utils::OpenHandle(this);
   Utils::ApiCheck(!obj->is_external(),
                   "v8::ArrayBuffer::Externalize",
                   "ArrayBuffer already externalized");
@@ skipping 1672 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal