src: add an ExternalReferenceRegistry class

Add an ExternalReferenceRegistry class for registering static
external references.

To register the external JS to C++ references created in a binding
(e.g. when a FunctionTemplate is created):

- Add the binding name (same as the id used for `internalBinding()`
  and `NODE_MODULE_CONTEXT_AWARE_INTERNAL`) to
  `EXTERNAL_REFERENCE_BINDING_LIST` in `src/node_external_reference.h`.
- In the file where the binding is implemented, create a registration
  function to register the static C++ references (e.g. the C++
  functions in `v8::FunctionCallback` associated with the function
  templates), like this:

  ```c++
  void RegisterExternalReferences(
          ExternalReferenceRegistry* registry) {
    registry->Register(cpp_func_1);
  }
  ```
- At the end of the file where `NODE_MODULE_CONTEXT_AWARE_INTERNAL` is
  also usually called, register the registration function with

  ```
  NODE_MODULE_EXTERNAL_REFERENCE(binding_name,
                                 RegisterExternalReferences);
  ```

PR-URL: https://github.com/nodejs/node/pull/32984
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/node.cc b/src/node.cc
index eabee549a68..e27edec0efe 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -1069,6 +1069,7 @@ int Start(int argc, char** argv) {
       if (blob != nullptr) {
         // TODO(joyeecheung): collect external references and set it in
         // params.external_references.
+        external_references = NodeMainInstance::CollectExternalReferences();
         external_references.push_back(reinterpret_cast<intptr_t>(nullptr));
         params.external_references = external_references.data();
         params.snapshot_blob = blob;