test(parallel): Add test to debug segfault on windows x64 (#9857)

**Description:**

 - Diff range: v1.10.4...v1.10.6

**Related issue:**

 - #9855

.github/workflows/CI.yml

@@ -497,12 +497,7 @@ jobs:
       fail-fast: false
       matrix:
         crate:
-          - better_scoped_tls
-          - string_enum
-          # - swc
-          - swc_bundler
-          # - swc_ecma_codegen
-          # - swc_ecma_minifier
+          - swc_parallel
     steps:
       - uses: actions/checkout@v4
         with:

crates/swc_ecma_utils/src/parallel.rs

@@ -3,18 +3,10 @@
 use once_cell::sync::Lazy;
 use swc_common::GLOBALS;
 use swc_ecma_ast::*;
-use swc_parallel::join;
-
-use self::private::Sealed;
-
-mod private {
-    pub trait Sealed {}
-
-    impl<T> Sealed for Vec<T> {}
-    impl<T> Sealed for &mut Vec<T> {}
-    impl<T> Sealed for &mut [T] {}
-    impl<T> Sealed for &[T] {}
-}
+use swc_parallel::{
+    items::{IntoItems, Items},
+    join,
+};
 
 static CPU_COUNT: Lazy<usize> = Lazy::new(num_cpus::get);
 
@@ -36,102 +28,6 @@ pub trait Parallel: swc_common::sync::Send + swc_common::sync::Sync {
     fn after_module_items(&mut self, _stmts: &mut Vec<ModuleItem>) {}
 }
 
-pub trait IntoItems: Sealed {
-    type Elem;
-    type Items: Items<Elem = Self::Elem>;
-
-    fn into_items(self) -> Self::Items;
-}
-
-impl<T, I> IntoItems for I
-where
-    I: Items<Elem = T>,
-{
-    type Elem = T;
-    type Items = I;
-
-    fn into_items(self) -> Self::Items {
-        self
-    }
-}
-
-impl<'a, T> IntoItems for &'a mut Vec<T>
-where
-    T: Send + Sync,
-{
-    type Elem = &'a mut T;
-    type Items = &'a mut [T];
-
-    fn into_items(self) -> Self::Items {
-        self
-    }
-}
-
-/// This is considered as a private type and it's NOT A PUBLIC API.
-#[allow(clippy::len_without_is_empty)]
-pub trait Items: Sized + IntoIterator<Item = Self::Elem> + Send + Sealed {
-    type Elem: Send + Sync;
-
-    fn len(&self) -> usize;
-
-    #[cfg(feature = "concurrent")]
-    fn split_at(self, idx: usize) -> (Self, Self);
-}
-
-impl<T> Items for Vec<T>
-where
-    T: Send + Sync,
-{
-    type Elem = T;
-
-    fn len(&self) -> usize {
-        Vec::len(self)
-    }
-
-    #[cfg(feature = "concurrent")]
-    fn split_at(mut self, at: usize) -> (Self, Self) {
-        let b = self.split_off(at);
-
-        (self, b)
-    }
-}
-
-impl<'a, T> Items for &'a mut [T]
-where
-    T: Send + Sync,
-{
-    type Elem = &'a mut T;
-
-    fn len(&self) -> usize {
-        <[T]>::len(self)
-    }
-
-    #[cfg(feature = "concurrent")]
-    fn split_at(self, at: usize) -> (Self, Self) {
-        let (a, b) = self.split_at_mut(at);
-
-        (a, b)
-    }
-}
-
-impl<'a, T> Items for &'a [T]
-where
-    T: Send + Sync,
-{
-    type Elem = &'a T;
-
-    fn len(&self) -> usize {
-        <[T]>::len(self)
-    }
-
-    #[cfg(feature = "concurrent")]
-    fn split_at(self, at: usize) -> (Self, Self) {
-        let (a, b) = self.split_at(at);
-
-        (a, b)
-    }
-}
-
 pub trait ParallelExt: Parallel {
     /// Invoke `op` in parallel, if `swc_ecma_utils` is compiled with
     /// concurrent feature enabled and `nodes.len()` is bigger than threshold.

crates/swc_parallel/Cargo.toml

@@ -12,7 +12,13 @@ version     = "1.0.1"
 default = ["parallel"]
 # Make it really parallel
 parallel = ["chili"]
+# Alias for parallel, just for CI. Do not use it if you are not working on SWC.
+concurrent = ["parallel"]
 
 [dependencies]
 chili     = { workspace = true, optional = true }
 once_cell = { workspace = true }
+
+[dev-dependencies]
+hstr       = { workspace = true }
+scoped-tls = { workspace = true }

crates/swc_parallel/src/items.rs

@@ -0,0 +1,102 @@
+use self::private::Sealed;
+
+mod private {
+    pub trait Sealed {}
+
+    impl<T> Sealed for Vec<T> {}
+    impl<T> Sealed for &mut Vec<T> {}
+    impl<T> Sealed for &mut [T] {}
+    impl<T> Sealed for &[T] {}
+}
+pub trait IntoItems: Sealed {
+    type Elem;
+    type Items: Items<Elem = Self::Elem>;
+
+    fn into_items(self) -> Self::Items;
+}
+
+impl<T, I> IntoItems for I
+where
+    I: Items<Elem = T>,
+{
+    type Elem = T;
+    type Items = I;
+
+    fn into_items(self) -> Self::Items {
+        self
+    }
+}
+
+impl<'a, T> IntoItems for &'a mut Vec<T>
+where
+    T: Send + Sync,
+{
+    type Elem = &'a mut T;
+    type Items = &'a mut [T];
+
+    fn into_items(self) -> Self::Items {
+        self
+    }
+}
+
+/// This is considered as a private type and it's NOT A PUBLIC API.
+#[allow(clippy::len_without_is_empty)]
+pub trait Items: Sized + IntoIterator<Item = Self::Elem> + Send + Sealed {
+    type Elem: Send + Sync;
+
+    fn len(&self) -> usize;
+
+    fn split_at(self, idx: usize) -> (Self, Self);
+}
+
+impl<T> Items for Vec<T>
+where
+    T: Send + Sync,
+{
+    type Elem = T;
+
+    fn len(&self) -> usize {
+        Vec::len(self)
+    }
+
+    fn split_at(mut self, at: usize) -> (Self, Self) {
+        let b = self.split_off(at);
+
+        (self, b)
+    }
+}
+
+impl<'a, T> Items for &'a mut [T]
+where
+    T: Send + Sync,
+{
+    type Elem = &'a mut T;
+
+    fn len(&self) -> usize {
+        <[T]>::len(self)
+    }
+
+    fn split_at(self, at: usize) -> (Self, Self) {
+        let (a, b) = self.split_at_mut(at);
+
+        (a, b)
+    }
+}
+
+impl<'a, T> Items for &'a [T]
+where
+    T: Send + Sync,
+{
+    type Elem = &'a T;
+
+    fn len(&self) -> usize {
+        <[T]>::len(self)
+    }
+
+    fn split_at(self, at: usize) -> (Self, Self) {
+        let (a, b) = self.split_at(at);
+
+        (a, b)
+    }
+}
+//

crates/swc_parallel/src/lib.rs

@@ -2,6 +2,8 @@
 
 use std::{cell::RefCell, mem::transmute};
 
+pub mod items;
+
 #[derive(Default)]
 pub struct MaybeScope<'a>(ScopeLike<'a>);