perf(es/helpers): Use bool instead of AtomicBool (#9321)

**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/9222

.changeset/cold-pillows-walk.md

@@ -0,0 +1,6 @@
+---
+swc_bundler: patch
+swc_ecma_transforms_base: patch
+---
+
+perf(es/helpers): Use `bool` instead of `AtomicBool`

crates/swc_bundler/src/bundler/chunk/merge.rs

@@ -9,6 +9,7 @@ use swc_common::{
     FileName, SyntaxContext, DUMMY_SP,
 };
 use swc_ecma_ast::*;
+use swc_ecma_transforms_base::helpers::Helpers;
 use swc_ecma_utils::{find_pat_ids, prepend_stmt, private_ident, quote_ident, ExprFactory};
 use swc_ecma_visit::{VisitMut, VisitMutWith};
 use EdgeDirection::Outgoing;
@@ -104,7 +105,18 @@ where
             let deps = all_deps_of_entry.iter().map(|id| {
                 let dep_info = self.scope.get_module(*id).unwrap();
                 entry_info.helpers.extend(&dep_info.helpers);
-                entry_info.swc_helpers.extend_from(&dep_info.swc_helpers);
+
+                {
+                    let helpers = *entry_info.swc_helpers.lock();
+                    let dep_helpers = *dep_info.swc_helpers.lock();
+
+                    let helpers = Helpers::from_data(helpers);
+                    let dep_helpers = Helpers::from_data(dep_helpers);
+
+                    helpers.extend_from(&dep_helpers);
+
+                    *entry_info.swc_helpers.lock() = helpers.data();
+                }
 
                 if *id == entry_id {
                     return Modules::empty(injected_ctxt);

crates/swc_bundler/src/bundler/finalize.rs

@@ -6,7 +6,7 @@ use swc_common::{collections::AHashMap, util::move_map::MoveMap, FileName, Mark,
 use swc_ecma_ast::*;
 use swc_ecma_transforms_base::{
     fixer::fixer,
-    helpers::{inject_helpers, HELPERS},
+    helpers::{inject_helpers, Helpers, HELPERS},
     hygiene::hygiene,
 };
 use swc_ecma_utils::{contains_top_level_await, find_pat_ids, private_ident, ExprFactory};
@@ -48,15 +48,16 @@ where
 
                 {
                     // Inject swc helpers
-                    let swc_helpers = self
+                    let swc_helpers = *self
                         .scope
                         .get_module(bundle.id)
                         .expect("module should exist at this point")
-                        .swc_helpers;
+                        .swc_helpers
+                        .lock();
 
                     let module = bundle.module;
 
-                    bundle.module = HELPERS.set(&swc_helpers, || {
+                    bundle.module = HELPERS.set(&Helpers::from_data(swc_helpers), || {
                         module.fold_with(&mut inject_helpers(unresolved_mark))
                     });
                 }

crates/swc_bundler/src/bundler/load.rs

@@ -4,7 +4,10 @@ use anyhow::{Context, Error};
 use is_macro::Is;
 #[cfg(feature = "rayon")]
 use rayon::iter::ParallelIterator;
-use swc_common::{sync::Lrc, FileName, SourceFile, SyntaxContext};
+use swc_common::{
+    sync::{Lock, Lrc},
+    FileName, SourceFile, SyntaxContext,
+};
 use swc_ecma_ast::{
     CallExpr, Callee, Expr, Ident, ImportDecl, ImportSpecifier, MemberExpr, MemberProp, Module,
     ModuleDecl, ModuleExportName, Str, SuperProp, SuperPropExpr,
@@ -38,7 +41,7 @@ pub(crate) struct TransformedModule {
     /// Used helpers
     pub helpers: Lrc<Helpers>,
 
-    pub swc_helpers: Lrc<swc_ecma_transforms_base::helpers::Helpers>,
+    pub swc_helpers: Lrc<Lock<swc_ecma_transforms_base::helpers::HelperData>>,
 
     local_ctxt: SyntaxContext,
     export_ctxt: SyntaxContext,
@@ -208,7 +211,7 @@ where
                     exports: Lrc::new(exports),
                     is_es6,
                     helpers: Default::default(),
-                    swc_helpers: Lrc::new(data.helpers),
+                    swc_helpers: Lrc::new(Lock::new(data.helpers.data())),
                     local_ctxt: SyntaxContext::empty().apply_mark(local_mark),
                     export_ctxt: SyntaxContext::empty().apply_mark(export_mark),
                 },

crates/swc_ecma_transforms_base/src/helpers/mod.rs

@@ -1,7 +1,4 @@
-use std::{
+use std::{cell::RefCell, mem::replace};
-    mem::replace,
-    sync::atomic::{AtomicBool, Ordering},
-};
 
 use once_cell::sync::Lazy;
 use rustc_hash::FxHashMap;
@@ -52,7 +49,7 @@ macro_rules! add_to {
             parse(&code)
         });
 
-        let enable = $b.load(Ordering::Relaxed);
+        let enable = $b;
         if enable {
             $buf.extend(STMTS.iter().cloned().map(|mut stmt| {
                 stmt.visit_mut_with(&mut Marker {
@@ -69,7 +66,7 @@ macro_rules! add_to {
 
 macro_rules! add_import_to {
     ($buf:expr, $name:ident, $b:expr, $mark:expr) => {{
-        let enable = $b.load(Ordering::Relaxed);
+        let enable = $b;
         if enable {
             let ctxt = SyntaxContext::empty().apply_mark($mark);
             let s = ImportSpecifier::Named(ImportNamedSpecifier {
@@ -103,6 +100,13 @@ better_scoped_tls::scoped_tls!(
 /// Tracks used helper methods. (e.g. __extends)
 #[derive(Debug, Default)]
 pub struct Helpers {
+    external: bool,
+    mark: HelperMark,
+    inner: RefCell<Inner>,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub struct HelperData {
     external: bool,
     mark: HelperMark,
     inner: Inner,
@@ -124,6 +128,22 @@ impl Helpers {
     pub const fn external(&self) -> bool {
         self.external
     }
+
+    pub fn data(&self) -> HelperData {
+        HelperData {
+            inner: *self.inner.borrow(),
+            external: self.external,
+            mark: self.mark,
+        }
+    }
+
+    pub fn from_data(data: HelperData) -> Self {
+        Helpers {
+            external: data.external,
+            mark: data.mark,
+            inner: RefCell::new(data.inner),
+        }
+    }
 }
 
 #[derive(Debug, Clone, Copy)]
@@ -140,15 +160,15 @@ macro_rules! define_helpers {
             $( $name:ident : ( $( $dep:ident ),* ), )*
         }
     ) => {
-        #[derive(Debug,Default)]
+        #[derive(Debug,Default, Clone, Copy)]
         struct Inner {
-            $( $name: AtomicBool, )*
+            $( $name: bool, )*
         }
 
         impl Helpers {
             $(
                 pub fn $name(&self) {
-                    self.inner.$name.store(true, Ordering::Relaxed);
+                    self.inner.borrow_mut().$name = true;
 
                     if !self.external {
                         $(
@@ -159,11 +179,14 @@ macro_rules! define_helpers {
             )*
         }
 
+
         impl Helpers {
             pub fn extend_from(&self, other: &Self) {
+                let other = other.inner.borrow();
+                let mut me = self.inner.borrow_mut();
                 $(
-                    if other.inner.$name.load(Ordering::SeqCst) {
+                    if other.$name {
-                        self.inner.$name.store(true, Ordering::Relaxed);
+                        me.$name = true;
                     }
                 )*
             }
@@ -173,8 +196,9 @@ macro_rules! define_helpers {
             fn is_helper_used(&self) -> bool{
 
                 HELPERS.with(|helpers|{
+                    let inner = helpers.inner.borrow();
                     false $(
-                      || helpers.inner.$name.load(Ordering::Relaxed)
+                      || inner.$name
                     )*
                 })
             }
@@ -184,8 +208,9 @@ macro_rules! define_helpers {
 
                 HELPERS.with(|helpers|{
                     debug_assert!(!helpers.external);
+                    let inner = helpers.inner.borrow();
                     $(
-                            add_to!(buf, $name, helpers.inner.$name, helpers.mark.0);
+                            add_to!(buf, $name, inner.$name, helpers.mark.0);
                     )*
                 });
 
@@ -196,9 +221,10 @@ macro_rules! define_helpers {
                 let mut buf = Vec::new();
 
                 HELPERS.with(|helpers|{
+                    let inner = helpers.inner.borrow();
                     debug_assert!(helpers.external);
                     $(
-                            add_import_to!(buf, $name, helpers.inner.$name, helpers.mark.0);
+                            add_import_to!(buf, $name, inner.$name, helpers.mark.0);
                     )*
                 });
 
@@ -209,8 +235,9 @@ macro_rules! define_helpers {
                 let mut buf = Vec::new();
                 HELPERS.with(|helpers|{
                     debug_assert!(helpers.external);
+                    let inner = helpers.inner.borrow();
                     $(
-                        let enable = helpers.inner.$name.load(Ordering::Relaxed);
+                        let enable = inner.$name;
                         if enable {
                             buf.push(self.build_reqire(stringify!($name), helpers.mark.0))
                         }

crates/swc_ecma_transforms_base/src/perf.rs

@@ -5,6 +5,7 @@ use swc_ecma_ast::*;
 pub use swc_ecma_utils::parallel::*;
 use swc_ecma_visit::{Fold, FoldWith, Visit, VisitMut, VisitMutWith, VisitWith};
 
+use crate::helpers::Helpers;
 #[cfg(feature = "concurrent")]
 use crate::helpers::HELPERS;
 
@@ -52,14 +53,18 @@ where
         if nodes.len() >= threshold {
             GLOBALS.with(|globals| {
                 HELPERS.with(|helpers| {
+                    let helpers = helpers.data();
+
                     HANDLER.with(|handler| {
                         use rayon::prelude::*;
 
                         let visitor = nodes
                             .into_par_iter()
                             .map(|node| {
+                                let helpers = Helpers::from_data(helpers);
+
                                 GLOBALS.set(globals, || {
-                                    HELPERS.set(helpers, || {
+                                    HELPERS.set(&helpers, || {
                                         HANDLER.set(handler, || {
                                             let mut visitor = Parallel::create(&*self);
                                             node.visit_with(&mut visitor);
@@ -110,14 +115,16 @@ where
         if nodes.len() >= threshold {
             GLOBALS.with(|globals| {
                 HELPERS.with(|helpers| {
+                    let helpers = helpers.data();
                     HANDLER.with(|handler| {
                         use rayon::prelude::*;
 
                         let visitor = nodes
                             .into_par_iter()
                             .map(|node| {
+                                let helpers = Helpers::from_data(helpers);
                                 GLOBALS.set(globals, || {
-                                    HELPERS.set(helpers, || {
+                                    HELPERS.set(&helpers, || {
                                         HANDLER.set(handler, || {
                                             let mut visitor = Parallel::create(&*self);
                                             node.visit_mut_with(&mut visitor);
@@ -170,12 +177,14 @@ where
 
             let (visitor, nodes) = GLOBALS.with(|globals| {
                 HELPERS.with(|helpers| {
+                    let helpers = helpers.data();
                     HANDLER.with(|handler| {
                         nodes
                             .into_par_iter()
                             .map(|node| {
+                                let helpers = Helpers::from_data(helpers);
                                 GLOBALS.set(globals, || {
-                                    HELPERS.set(helpers, || {
+                                    HELPERS.set(&helpers, || {
                                         HANDLER.set(handler, || {
                                             let mut visitor = Parallel::create(&*self);
                                             let node = node.fold_with(&mut visitor);