src: add function to reset arguments to default

src/node.cc

@@ -2600,6 +2600,9 @@ void Init(std::vector<std::string>* argv,
   node_is_initialized = true;
 }
 
+NODE_EXTERN void ResetOptions() {
+  per_process_opts->Reset();
+}
 // TODO(addaleax): Deprecate and eventually remove this.
 void Init(int* argc,
           const char** argv,

src/node.h

@@ -208,6 +208,7 @@ NODE_EXTERN void Init(int* argc,
                       const char** argv,
                       int* exec_argc,
                       const char*** exec_argv);
+NODE_EXTERN void ResetOptions();
 
 class ArrayBufferAllocator;
 

src/node_options.cc

@@ -27,10 +27,51 @@ void PerProcessOptions::CheckOptions(std::vector<std::string>* errors) {
   per_isolate->CheckOptions(errors);
 }
 
+void PerProcessOptions::Reset() {
+  per_isolate->Reset();
+  title = "";
+  trace_event_categories = "";
+  trace_event_file_pattern = "node_trace.${rotation}.log";
+  v8_thread_pool_size = 4;
+  zero_fill_all_buffers = false;
+
+  security_reverts.clear();
+  print_bash_completion = false;
+  print_help = false;
+  print_v8_help = false;
+  print_version = false;
+
+#ifdef NODE_HAVE_I18N_SUPPORT
+  icu_data_dir = "";
+#endif
+
+  // TODO(addaleax): Some of these could probably be per-Environment.
+#if HAVE_OPENSSL
+  openssl_config = "";
+  tls_cipher_list = DEFAULT_CIPHER_LIST_CORE;
+#ifdef NODE_OPENSSL_CERT_STORE
+  ssl_openssl_cert_store = true;
+#else
+  ssl_openssl_cert_store = false;
+#endif
+  use_openssl_ca = false;
+  use_bundled_ca = false;
+#if NODE_FIPS_MODE
+  enable_fips_crypto = false;
+  force_fips_crypto = false;
+#endif
+#endif
+}
+
 void PerIsolateOptions::CheckOptions(std::vector<std::string>* errors) {
   per_env->CheckOptions(errors);
 }
 
+void PerIsolateOptions::Reset() {
+  per_env->Reset();
+  track_heap_objects = false;
+}
+
 void EnvironmentOptions::CheckOptions(std::vector<std::string>* errors) {
   if (!userland_loader.empty() && !experimental_modules) {
     errors->push_back("--loader requires --experimental-modules be enabled");
@@ -42,6 +83,39 @@ void EnvironmentOptions::CheckOptions(std::vector<std::string>* errors) {
   debug_options->CheckOptions(errors);
 }
 
+void EnvironmentOptions::Reset() {
+  debug_options->Reset();
+  abort_on_uncaught_exception = false;
+  experimental_modules = false;
+  experimental_repl_await = false;
+  experimental_vm_modules = false;
+  experimental_worker = false;
+  expose_internals = false;
+  no_deprecation = false;
+  no_force_async_hooks_checks = false;
+  no_warnings = false;
+  pending_deprecation = false;
+  preserve_symlinks = false;
+  preserve_symlinks_main = false;
+  prof_process = false;
+  redirect_warnings = "";
+  throw_deprecation = false;
+  trace_deprecation = false;
+  trace_sync_io = false;
+  trace_warnings = false;
+  userland_loader = "";
+
+  syntax_check_only = false;
+  has_eval_string = false;
+  eval_string = "";
+  print_eval = false;
+  force_repl = false;
+
+  preload_modules.clear();
+
+  user_argv.clear();
+}
+
 namespace options_parser {
 
 // XXX: If you add an option here, please also add it to doc/node.1 and

src/node_options.h

@@ -61,6 +61,14 @@ class DebugOptions : public Options {
   int port() {
     return host_port.port < 0 ? kDefaultInspectorPort : host_port.port;
   }
+
+  void Reset() {
+    inspector_enabled = false;
+    deprecated_debug = false;
+    break_first_line = false;
+    break_node_first_line = false;
+    host_port = {"127.0.0.1", -1};
+  }
 };
 
 class EnvironmentOptions : public Options {
@@ -98,6 +106,7 @@ class EnvironmentOptions : public Options {
 
   inline DebugOptions* get_debug_options();
   void CheckOptions(std::vector<std::string>* errors);
+  void Reset();
 };
 
 class PerIsolateOptions : public Options {
@@ -107,6 +116,7 @@ class PerIsolateOptions : public Options {
 
   inline EnvironmentOptions* get_per_env_options();
   void CheckOptions(std::vector<std::string>* errors);
+  void Reset();
 };
 
 class PerProcessOptions : public Options {
@@ -148,6 +158,7 @@ class PerProcessOptions : public Options {
 
   inline PerIsolateOptions* get_per_isolate_options();
   void CheckOptions(std::vector<std::string>* errors);
+  void Reset();
 };
 
 // The actual options parser, as opposed to the structs containing them: