Provide accessor for object internal properties that doesn't require debugger to be active

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 6072 matching lines @@
 
 
 Local<Object> Array::CloneElementAt(uint32_t index) {
   auto context = ContextFromHeapObject(Utils::OpenHandle(this));
   RETURN_TO_LOCAL_UNCHECKED(CloneElementAt(context, index), Object);
 }
 
 
 bool Value::IsPromise() const {
   auto self = Utils::OpenHandle(this);
-  if (!self->IsJSObject()) return false;
-  auto js_object = i::Handle<i::JSObject>::cast(self);
-  // Promises can't have access checks.
-  if (js_object->map()->is_access_check_needed()) return false;
-  auto isolate = js_object->GetIsolate();
-  // TODO(dcarney): this should just be read from the symbol registry so as not
-  // to be context dependent.
-  auto key = isolate->promise_status();
-  // Shouldn't be possible to throw here.
-  return i::JSObject::HasRealNamedProperty(js_object, key).FromJust();
+  return i::Object::IsPromise(self);
 }
 
 
 MaybeLocal<Promise::Resolver> Promise::Resolver::New(Local<Context> context) {
   PREPARE_FOR_EXECUTION(context, "Promise::Resolver::New", Resolver);
   i::Handle<i::Object> result;
   has_pending_exception = !i::Execution::Call(
       isolate,
       isolate->promise_create(),
       isolate->factory()->undefined_value(),
@@ skipping 1274 matching lines @@
   return Utils::ToLocal(i::Isolate::Current()->debug()->GetDebugContext());
 }
 
 
 void Debug::SetLiveEditEnabled(Isolate* isolate, bool enable) {
   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
   internal_isolate->debug()->set_live_edit_enabled(enable);
 }
 
 
+MaybeLocal<Array> Debug::GetInternalProperties(Isolate* v8_isolate,
+                                               Local<Value> value) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
+  ENTER_V8(isolate);
+  i::Handle<i::Object> val = Utils::OpenHandle(*value);
+  i::Handle<i::JSArray> result;
+  if (!i::Runtime::GetInternalProperties(isolate, val).ToHandle(&result))
+    return MaybeLocal<Array>();
+  return Utils::ToLocal(result);
+}
+
+
 Handle<String> CpuProfileNode::GetFunctionName() const {
   i::Isolate* isolate = i::Isolate::Current();
   const i::ProfileNode* node = reinterpret_cast<const i::ProfileNode*>(this);
   const i::CodeEntry* entry = node->entry();
   i::Handle<i::String> name =
       isolate->factory()->InternalizeUtf8String(entry->name());
   if (!entry->has_name_prefix()) {
     return ToApiHandle<String>(name);
   } else {
     // We do not expect this to fail. Change this if it does.
@@ skipping 625 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