src: add iteration over all base objects to Environment

PR-URL: https://github.com/nodejs/node/pull/21741
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

src/env-inl.h

@@ -809,6 +809,22 @@ bool Environment::CleanupHookCallback::Equal::operator()(
   return a.fn_ == b.fn_ && a.arg_ == b.arg_;
 }
 
+BaseObject* Environment::CleanupHookCallback::GetBaseObject() const {
+  if (fn_ == BaseObject::DeleteMe)
+    return static_cast<BaseObject*>(arg_);
+  else
+    return nullptr;
+}
+
+template <typename T>
+void Environment::ForEachBaseObject(T&& iterator) {
+  for (const auto& hook : cleanup_hooks_) {
+    BaseObject* obj = hook.GetBaseObject();
+    if (obj != nullptr)
+      iterator(obj);
+  }
+}
+
 #define VP(PropertyName, StringValue) V(v8::Private, PropertyName)
 #define VY(PropertyName, StringValue) V(v8::Symbol, PropertyName)
 #define VS(PropertyName, StringValue) V(v8::String, PropertyName)

src/env.h

@@ -981,6 +981,8 @@ class Environment {
       inline bool operator()(const CleanupHookCallback& a,
                              const CleanupHookCallback& b) const;
     };
+
+    inline BaseObject* GetBaseObject() const;
   };
 
   // Use an unordered_set, so that we have efficient insertion and removal.
@@ -993,6 +995,9 @@ class Environment {
                              v8::Local<v8::Promise> promise,
                              v8::Local<v8::Value> parent);
 
+  template <typename T>
+  void ForEachBaseObject(T&& iterator);
+
 #define V(PropertyName, TypeName) Persistent<TypeName> PropertyName ## _;
   ENVIRONMENT_STRONG_PERSISTENT_PROPERTIES(V)
 #undef V