[V8] Unify get function name for debugging purpose

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 4425 matching lines @@
   if (!self->IsJSFunction()) {
     return ToApiHandle<Primitive>(
         self->GetIsolate()->factory()->undefined_value());
   }
   auto func = i::Handle<i::JSFunction>::cast(self);
   return Utils::ToLocal(i::Handle<i::Object>(func->shared()->inferred_name(),
                                              func->GetIsolate()));
 }
 
 
+Local<Value> Function::GetDebugName() const {
+  auto self = Utils::OpenHandle(this);
+  if (!self->IsJSFunction()) {
+    return ToApiHandle<Primitive>(
+        self->GetIsolate()->factory()->undefined_value());
+  }
+  auto func = i::Handle<i::JSFunction>::cast(self);
+  i::Handle<i::String> name = i::JSFunction::GetDebugName(func);
+  return Utils::ToLocal(i::Handle<i::Object>(*name, name->GetIsolate()));
+}
+
+
 Local<Value> Function::GetDisplayName() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ENTER_V8(isolate);
   auto self = Utils::OpenHandle(this);
   if (!self->IsJSFunction()) {
     return ToApiHandle<Primitive>(isolate->factory()->undefined_value());
   }
   auto func = i::Handle<i::JSFunction>::cast(self);
   i::Handle<i::String> property_name =
       isolate->factory()->NewStringFromStaticChars("displayName");
@@ skipping 4044 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8