From ba67ffe2d788ad1d3f151bd7fae578716668b193 Mon Sep 17 00:00:00 2001
From: h-a-n-a <andywangsy@gmail.com>
Date: Fri, 3 Feb 2023 02:31:40 +0800
Subject: [PATCH] perf: stack mem-move

---
 crates/rspack_core/src/ast/css.rs        | 4 ++--
 crates/rspack_core/src/ast/javascript.rs | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/crates/rspack_core/src/ast/css.rs b/crates/rspack_core/src/ast/css.rs
index 2d61118452df..8788c4e6b7bc 100644
--- a/crates/rspack_core/src/ast/css.rs
+++ b/crates/rspack_core/src/ast/css.rs
@@ -21,7 +21,7 @@ impl fmt::Debug for Context {
 
 #[derive(Debug, Clone)]
 pub struct Ast {
-  root: SwcStylesheet,
+  root: Box<SwcStylesheet>,
   context: Arc<Context>,
 }
 
@@ -34,7 +34,7 @@ impl Hash for Ast {
 impl Ast {
   pub fn new(root: SwcStylesheet, source_map: Arc<SourceMap>) -> Self {
     Self {
-      root,
+      root: box root,
       context: Arc::new(Context::new(source_map)),
     }
   }
diff --git a/crates/rspack_core/src/ast/javascript.rs b/crates/rspack_core/src/ast/javascript.rs
index 8f070be6f6dd..69b860996b6e 100644
--- a/crates/rspack_core/src/ast/javascript.rs
+++ b/crates/rspack_core/src/ast/javascript.rs
@@ -19,11 +19,11 @@ use swc_core::ecma::visit::{
 /// Use this to avoid using `use swc_ecma_visit::*`
 /// and save changes in self
 #[derive(Debug, Clone, Hash)]
-pub struct Program(SwcProgram);
+pub struct Program(Box<SwcProgram>);
 
 impl Program {
   pub fn fold_with<V: ?Sized + Fold>(&mut self, v: &mut V) {
-    let p = std::mem::replace(&mut self.0, SwcProgram::Module(Module::dummy()));
+    let p = std::mem::replace(&mut self.0, box SwcProgram::Module(Module::dummy()));
     self.0 = p.fold_with(v);
   }
 
@@ -126,7 +126,7 @@ impl Ast {
       SwcProgram::Script(_) => false,
     };
     Self {
-      program: Program(program),
+      program: Program(box program),
       context: Arc::new(Context::new(is_esm, source_map)),
     }
   }