From c1cdb39e75756af9f85344fa3acdf4cd2d68691d Mon Sep 17 00:00:00 2001
From: Gabriel Schulhof <gabriel.schulhof@intel.com>
Date: Thu, 9 Jul 2020 11:00:41 -0700
Subject: [PATCH] src: wrap finalizer callback

---
 napi-inl.h | 38 ++++++++++++++++++++++++++++++--------
 1 file changed, 30 insertions(+), 8 deletions(-)

diff --git a/napi-inl.h b/napi-inl.h
index a18ffcd59..4f0636a08 100644
--- a/napi-inl.h
+++ b/napi-inl.h
@@ -82,6 +82,24 @@ inline napi_value WrapCallback(Callable callback) {
 #endif // NAPI_CPP_EXCEPTIONS
 }
 
+// For use in JS to C++ void callback wrappers to catch any Napi::Error
+// exceptions and rethrow them as JavaScript exceptions before returning from the
+// callback.
+template <typename Callable>
+inline void WrapVoidCallback(Callable callback) {
+#ifdef NAPI_CPP_EXCEPTIONS
+  try {
+    callback();
+  } catch (const Error& e) {
+    e.ThrowAsJavaScriptException();
+  }
+#else // NAPI_CPP_EXCEPTIONS
+  // When C++ exceptions are disabled, errors are immediately thrown as JS
+  // exceptions, so there is no need to catch and rethrow them here.
+  callback();
+#endif // NAPI_CPP_EXCEPTIONS
+}
+
 template <typename Callable, typename Return>
 struct CallbackData {
   static inline
@@ -120,17 +138,21 @@ struct CallbackData<Callable, void> {
 template <typename T, typename Finalizer, typename Hint = void>
 struct FinalizeData {
   static inline
-  void Wrapper(napi_env env, void* data, void* finalizeHint) {
-    FinalizeData* finalizeData = static_cast<FinalizeData*>(finalizeHint);
-    finalizeData->callback(Env(env), static_cast<T*>(data));
-    delete finalizeData;
+  void Wrapper(napi_env env, void* data, void* finalizeHint) noexcept {
+    WrapVoidCallback([&] {
+      FinalizeData* finalizeData = static_cast<FinalizeData*>(finalizeHint);
+      finalizeData->callback(Env(env), static_cast<T*>(data));
+      delete finalizeData;
+    });
   }
 
   static inline
-  void WrapperWithHint(napi_env env, void* data, void* finalizeHint) {
-    FinalizeData* finalizeData = static_cast<FinalizeData*>(finalizeHint);
-    finalizeData->callback(Env(env), static_cast<T*>(data), finalizeData->hint);
-    delete finalizeData;
+  void WrapperWithHint(napi_env env, void* data, void* finalizeHint) noexcept {
+    WrapVoidCallback([&] {
+      FinalizeData* finalizeData = static_cast<FinalizeData*>(finalizeHint);
+      finalizeData->callback(Env(env), static_cast<T*>(data), finalizeData->hint);
+      delete finalizeData;
+    });
   }
 
   Finalizer callback;