trace_events: move SetupTraceCategoryState into node_trace_events.cc

It makes more sense to put it in `internalBinding('trace_events')`
instead of in the bootstrapper object.

PR-URL: #25128
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: joyeecheung

Diff for: lib/internal/bootstrap/node.js

@@ -18,7 +18,6 @@
 /* global isMainThread */
 
 const {
-  _setupTraceCategoryState,
   _setupNextTick,
   _setupPromises
 } = bootstrappers;
@@ -431,7 +430,10 @@ function readAndExecuteStdin() {
 }
 
 function setupTraceCategoryState() {
-  const { traceCategoryState } = internalBinding('trace_events');
+  const {
+    traceCategoryState,
+    setTraceCategoryStateUpdateHandler
+  } = internalBinding('trace_events');
   const kCategoryAsyncHooks = 0;
   let traceEventsAsyncHook;
 
@@ -453,7 +455,7 @@ function setupTraceCategoryState() {
   }
 
   toggleTraceCategoryState();
-  _setupTraceCategoryState(toggleTraceCategoryState);
+  setTraceCategoryStateUpdateHandler(toggleTraceCategoryState);
 }
 
 function setupProcessObject() {

Diff for: src/bootstrapper.cc

@@ -30,12 +30,6 @@ void RunMicrotasks(const FunctionCallbackInfo<Value>& args) {
   args.GetIsolate()->RunMicrotasks();
 }
 
-void SetupTraceCategoryState(const FunctionCallbackInfo<Value>& args) {
-  Environment* env = Environment::GetCurrent(args);
-  CHECK(args[0]->IsFunction());
-  env->set_trace_category_state_function(args[0].As<Function>());
-}
-
 void SetupNextTick(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
   Isolate* isolate = env->isolate();
@@ -136,7 +130,6 @@ void SetupPromises(const FunctionCallbackInfo<Value>& args) {
 // completes so that it can be gc'd as soon as possible.
 void SetupBootstrapObject(Environment* env,
                           Local<Object> bootstrapper) {
-  BOOTSTRAP_METHOD(_setupTraceCategoryState, SetupTraceCategoryState);
   BOOTSTRAP_METHOD(_setupNextTick, SetupNextTick);
   BOOTSTRAP_METHOD(_setupPromises, SetupPromises);
 }

Diff for: src/node_trace_events.cc

@@ -11,6 +11,7 @@ namespace node {
 
 using v8::Array;
 using v8::Context;
+using v8::Function;
 using v8::FunctionCallbackInfo;
 using v8::FunctionTemplate;
 using v8::Local;
@@ -102,13 +103,23 @@ void GetEnabledCategories(const FunctionCallbackInfo<Value>& args) {
   }
 }
 
+static void SetTraceCategoryStateUpdateHandler(
+    const FunctionCallbackInfo<Value>& args) {
+  Environment* env = Environment::GetCurrent(args);
+  CHECK(args[0]->IsFunction());
+  env->set_trace_category_state_function(args[0].As<Function>());
+}
+
 void NodeCategorySet::Initialize(Local<Object> target,
                 Local<Value> unused,
                 Local<Context> context,
                 void* priv) {
   Environment* env = Environment::GetCurrent(context);
 
   env->SetMethod(target, "getEnabledCategories", GetEnabledCategories);
+  env->SetMethod(
+      target, "setTraceCategoryStateUpdateHandler",
+      SetTraceCategoryStateUpdateHandler);
 
   Local<FunctionTemplate> category_set =
       env->NewFunctionTemplate(NodeCategorySet::New);