fs: improve error performance of realpathSync

PR-URL: #49962
Refs: nodejs/performance#106
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Stephen Belanger <[email protected]>
Reviewed-By: Vinícius Lourenço Claro Cardoso <[email protected]>

Author: anonrig

lib/fs.js

@@ -2750,10 +2750,10 @@ function realpathSync(p, options) {
 realpathSync.native = (path, options) => {
   options = getOptions(options);
   path = getValidatedPath(path);
-  const ctx = { path };
-  const result = binding.realpath(pathModule.toNamespacedPath(path), options.encoding, undefined, ctx);
-  handleErrorFromBinding(ctx);
-  return result;
+  return binding.realpath(
+    pathModule.toNamespacedPath(path),
+    options.encoding,
+  );
 };
 
 /**

src/node_file.cc

@@ -1863,28 +1863,27 @@ static void RealPath(const FunctionCallbackInfo<Value>& args) {
   Isolate* isolate = env->isolate();
 
   const int argc = args.Length();
-  CHECK_GE(argc, 3);
+  CHECK_GE(argc, 2);
 
   BufferValue path(isolate, args[0]);
   CHECK_NOT_NULL(*path);
 
   const enum encoding encoding = ParseEncoding(isolate, args[1], UTF8);
 
-  FSReqBase* req_wrap_async = GetReqWrap(args, 2);
-  if (req_wrap_async != nullptr) {  // realpath(path, encoding, req)
+  if (argc > 2) {  // realpath(path, encoding, req)
+    FSReqBase* req_wrap_async = GetReqWrap(args, 2);
     FS_ASYNC_TRACE_BEGIN1(
         UV_FS_REALPATH, req_wrap_async, "path", TRACE_STR_COPY(*path))
     AsyncCall(env, req_wrap_async, args, "realpath", encoding, AfterStringPtr,
               uv_fs_realpath, *path);
   } else {  // realpath(path, encoding, undefined, ctx)
-    CHECK_EQ(argc, 4);
-    FSReqWrapSync req_wrap_sync;
+    FSReqWrapSync req_wrap_sync("realpath", *path);
     FS_SYNC_TRACE_BEGIN(realpath);
-    int err = SyncCall(env, args[3], &req_wrap_sync, "realpath",
-                       uv_fs_realpath, *path);
+    int err =
+        SyncCallAndThrowOnError(env, &req_wrap_sync, uv_fs_realpath, *path);
     FS_SYNC_TRACE_END(realpath);
     if (err < 0) {
-      return;  // syscall failed, no need to continue, error info is in ctx
+      return;
     }
 
     const char* link_path = static_cast<const char*>(req_wrap_sync.req.ptr);
@@ -1895,8 +1894,7 @@ static void RealPath(const FunctionCallbackInfo<Value>& args) {
                                                encoding,
                                                &error);
     if (rc.IsEmpty()) {
-      Local<Object> ctx = args[3].As<Object>();
-      ctx->Set(env->context(), env->error_string(), error).Check();
+      env->isolate()->ThrowException(error);
       return;
     }
 

typings/internalBinding/fs.d.ts

@@ -184,6 +184,7 @@ declare namespace InternalFSBinding {
   function realpath(path: StringOrBuffer, encoding: unknown, req: FSReqCallback<string | Buffer>): void;
   function realpath(path: StringOrBuffer, encoding: unknown, req: undefined, ctx: FSSyncContext): string | Buffer;
   function realpath(path: StringOrBuffer, encoding: unknown, usePromises: typeof kUsePromises): Promise<string | Buffer>;
+  function realpath(path: StringOrBuffer, encoding: unknown): StringOrBuffer;
 
   function rename(oldPath: string, newPath: string, req: FSReqCallback): void;
   function rename(oldPath: string, newPath: string, req: undefined, ctx: FSSyncContext): void;