Lazily compute boundfunction .name and .length if possible

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 4487 matching lines @@
 void Function::SetName(v8::Local<v8::String> name) {
   auto self = Utils::OpenHandle(this);
   if (!self->IsJSFunction()) return;
   auto func = i::Handle<i::JSFunction>::cast(self);
   func->shared()->set_name(*Utils::OpenHandle(*name));
 }
 
 
 Local<Value> Function::GetName() const {
   auto self = Utils::OpenHandle(this);
+  i::Isolate* isolate = self->GetIsolate();
   if (self->IsJSBoundFunction()) {
     auto func = i::Handle<i::JSBoundFunction>::cast(self);
-    return Utils::ToLocal(handle(func->name(), func->GetIsolate()));
+    i::Handle<i::Object> name;
+    ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, name,
+                                     i::JSBoundFunction::GetName(isolate, func),
+                                     Local<Value>());
+    return Utils::ToLocal(name);
   }
   if (self->IsJSFunction()) {
     auto func = i::Handle<i::JSFunction>::cast(self);
-    return Utils::ToLocal(handle(func->shared()->name(), func->GetIsolate()));
+    return Utils::ToLocal(handle(func->shared()->name(), isolate));
   }
-  return ToApiHandle<Primitive>(
-      self->GetIsolate()->factory()->undefined_value());
+  return ToApiHandle<Primitive>(isolate->factory()->undefined_value());
 }
 
 
 Local<Value> Function::GetInferredName() 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);
@@ skipping 4254 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