src: allow N-API addon in AddLinkedBinding()

`AddLinkedBinding()` can be used to load old-style Node.js addons, but
currently not N-API addons. There’s no good reason not to support
N-API addons as well, so add that.

PR-URL: #35301
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>

Author: addaleax

src/api/environment.cc

@@ -677,6 +677,10 @@ void AddLinkedBinding(Environment* env, const node_module& mod) {
     prev_head->nm_link = &env->extra_linked_bindings()->back();
 }
 
+void AddLinkedBinding(Environment* env, const napi_module& mod) {
+  AddLinkedBinding(env, napi_module_to_node_module(&mod));
+}
+
 void AddLinkedBinding(Environment* env,
                       const char* name,
                       addon_context_register_func fn,

src/node.h

@@ -117,6 +117,8 @@
 // Forward-declare libuv loop
 struct uv_loop_s;
 
+struct napi_module;
+
 // Forward-declare these functions now to stop MSVS from becoming
 // terminally confused when it's done in node_internals.h
 namespace node {
@@ -824,6 +826,8 @@ extern "C" NODE_EXTERN void node_module_register(void* mod);
 // In each variant, the registration function needs to be usable at least for
 // the time during which the Environment exists.
 NODE_EXTERN void AddLinkedBinding(Environment* env, const node_module& mod);
+NODE_EXTERN void AddLinkedBinding(Environment* env,
+                                  const struct napi_module& mod);
 NODE_EXTERN void AddLinkedBinding(Environment* env,
                                   const char* name,
                                   addon_context_register_func fn,

src/node_api.cc

@@ -447,7 +447,7 @@ static void napi_module_register_cb(v8::Local<v8::Object> exports,
                                     v8::Local<v8::Context> context,
                                     void* priv) {
   napi_module_register_by_symbol(exports, module, context,
-      static_cast<napi_module*>(priv)->nm_register_func);
+      static_cast<const napi_module*>(priv)->nm_register_func);
 }
 
 void napi_module_register_by_symbol(v8::Local<v8::Object> exports,
@@ -480,19 +480,26 @@ void napi_module_register_by_symbol(v8::Local<v8::Object> exports,
   }
 }
 
-// Registers a NAPI module.
-void napi_module_register(napi_module* mod) {
-  node::node_module* nm = new node::node_module {
+namespace node {
+node_module napi_module_to_node_module(const napi_module* mod) {
+  return {
     -1,
     mod->nm_flags | NM_F_DELETEME,
     nullptr,
     mod->nm_filename,
     nullptr,
     napi_module_register_cb,
     mod->nm_modname,
-    mod,  // priv
+    const_cast<napi_module*>(mod),  // priv
     nullptr,
   };
+}
+}  // namespace node
+
+// Registers a NAPI module.
+void napi_module_register(napi_module* mod) {
+  node::node_module* nm = new node::node_module(
+      node::napi_module_to_node_module(mod));
   node::node_module_register(nm);
 }
 

src/node_api.h

@@ -31,7 +31,7 @@ struct uv_loop_s;  // Forward declaration.
 typedef napi_value (*napi_addon_register_func)(napi_env env,
                                                napi_value exports);
 
-typedef struct {
+typedef struct napi_module {
   int nm_version;
   unsigned int nm_flags;
   const char* nm_filename;

src/node_internals.h

@@ -398,6 +398,8 @@ namespace fs {
 std::string Basename(const std::string& str, const std::string& extension);
 }  // namespace fs
 
+node_module napi_module_to_node_module(const napi_module* mod);
+
 }  // namespace node
 
 #endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

test/cctest/test_linked_binding.cc

@@ -1,5 +1,5 @@
 #include "node_test_fixture.h"
-#include "node_internals.h"  // RunBootstrapping()
+#include "node_api.h"
 
 void InitializeBinding(v8::Local<v8::Object> exports,
                        v8::Local<v8::Value> module,
@@ -83,3 +83,110 @@ TEST_F(LinkedBindingTest, LocallyDefinedLinkedBindingTest) {
   CHECK_EQ(strcmp(*utf8val, "value"), 0);
   CHECK_EQ(calls, 1);
 }
+
+napi_value InitializeLocalNapiBinding(napi_env env, napi_value exports) {
+  napi_value key, value;
+  CHECK_EQ(
+      napi_create_string_utf8(env, "hello", NAPI_AUTO_LENGTH, &key), napi_ok);
+  CHECK_EQ(
+      napi_create_string_utf8(env, "world", NAPI_AUTO_LENGTH, &value), napi_ok);
+  CHECK_EQ(napi_set_property(env, exports, key, value), napi_ok);
+  return nullptr;
+}
+
+static napi_module local_linked_napi = {
+  NAPI_MODULE_VERSION,
+  node::ModuleFlags::kLinked,
+  nullptr,
+  InitializeLocalNapiBinding,
+  "local_linked_napi",
+  nullptr,
+  {0},
+};
+
+TEST_F(LinkedBindingTest, LocallyDefinedLinkedBindingNapiTest) {
+  const v8::HandleScope handle_scope(isolate_);
+  const Argv argv;
+  Env test_env {handle_scope, argv};
+
+  AddLinkedBinding(*test_env, local_linked_napi);
+
+  v8::Local<v8::Context> context = isolate_->GetCurrentContext();
+
+  const char* run_script =
+      "process._linkedBinding('local_linked_napi').hello";
+  v8::Local<v8::Script> script = v8::Script::Compile(
+      context,
+      v8::String::NewFromOneByte(isolate_,
+                                 reinterpret_cast<const uint8_t*>(run_script))
+                                 .ToLocalChecked())
+      .ToLocalChecked();
+  v8::Local<v8::Value> completion_value = script->Run(context).ToLocalChecked();
+  v8::String::Utf8Value utf8val(isolate_, completion_value);
+  CHECK_NOT_NULL(*utf8val);
+  CHECK_EQ(strcmp(*utf8val, "world"), 0);
+}
+
+napi_value NapiLinkedWithInstanceData(napi_env env, napi_value exports) {
+  int* instance_data = new int(0);
+  CHECK_EQ(
+      napi_set_instance_data(
+          env,
+          instance_data,
+          [](napi_env env, void* data, void* hint) {
+            ++*static_cast<int*>(data);
+          }, nullptr),
+      napi_ok);
+
+  napi_value key, value;
+  CHECK_EQ(
+      napi_create_string_utf8(env, "hello", NAPI_AUTO_LENGTH, &key), napi_ok);
+  CHECK_EQ(
+      napi_create_external(env, instance_data, nullptr, nullptr, &value),
+      napi_ok);
+  CHECK_EQ(napi_set_property(env, exports, key, value), napi_ok);
+  return nullptr;
+}
+
+static napi_module local_linked_napi_id = {
+  NAPI_MODULE_VERSION,
+  node::ModuleFlags::kLinked,
+  nullptr,
+  NapiLinkedWithInstanceData,
+  "local_linked_napi_id",
+  nullptr,
+  {0},
+};
+
+TEST_F(LinkedBindingTest, LocallyDefinedLinkedBindingNapiInstanceDataTest) {
+  const v8::HandleScope handle_scope(isolate_);
+  int* instance_data = nullptr;
+
+  {
+    const Argv argv;
+    Env test_env {handle_scope, argv};
+
+    AddLinkedBinding(*test_env, local_linked_napi_id);
+
+    v8::Local<v8::Context> context = isolate_->GetCurrentContext();
+
+    const char* run_script =
+        "process._linkedBinding('local_linked_napi_id').hello";
+    v8::Local<v8::Script> script = v8::Script::Compile(
+        context,
+        v8::String::NewFromOneByte(isolate_,
+                                   reinterpret_cast<const uint8_t*>(run_script))
+                                   .ToLocalChecked())
+        .ToLocalChecked();
+    v8::Local<v8::Value> completion_value =
+        script->Run(context).ToLocalChecked();
+    CHECK(completion_value->IsExternal());
+    instance_data = static_cast<int*>(
+        completion_value.As<v8::External>()->Value());
+    CHECK_NE(instance_data, nullptr);
+    CHECK_EQ(*instance_data, 0);
+  }
+
+  CHECK_EQ(*instance_data, 1);
+  delete instance_data;
+}