perf(es/codegen): Optimize using swc_allocator

.changeset/four-cheetahs-type.md

@@ -0,0 +1,5 @@
+---
+swc_ecma_codegen: patch
+---
+
+perf(es/codegen): Optimize using `swc_allocator`

.gitignore

@@ -61,4 +61,7 @@ pkg/
 
 # Used by scripts
 *.tmp.txt
-swc-core-*.tgz
+swc-core-*.tgz
+
+# samply
+profile.json

Cargo.toml

@@ -75,6 +75,7 @@ resolver = "2"
   flate2                    = "1.0"
   futures                   = "0.3"
   glob                      = "0.3.0"
+  hashbrown                 = "0.14.5"
   hex                       = "0.4.3"
   hstr                      = "0.2.8"
   indexmap                  = "2.0.0"

crates/swc_allocator/Cargo.toml

@@ -15,7 +15,7 @@ version       = "0.1.7"
 
 [features]
 default = ["scoped"]
-nightly = ["bumpalo/allocator_api"]
+nightly = ["bumpalo/allocator_api", "hashbrown/nightly"]
 rkyv    = ["dep:rkyv"]
 scoped  = ["nightly"]
 serde   = ["dep:serde"]
@@ -26,8 +26,10 @@ bumpalo = { workspace = true, features = [
   "collections",
   "allocator-api2",
 ] }
+hashbrown = { workspace = true }
 ptr_meta = { workspace = true }
 rkyv = { workspace = true, optional = true }
+rustc-hash = { workspace = true }
 serde = { workspace = true, optional = true }
 triomphe = { workspace = true }
 

crates/swc_allocator/src/collections.rs

@@ -0,0 +1,33 @@
+//! Various collections.
+
+use std::hash::BuildHasherDefault;
+
+use rustc_hash::FxHasher;
+
+#[cfg(feature = "nightly")]
+use crate::FastAlloc;
+
+/// See [std::collections::HashMap].
+#[cfg(feature = "nightly")]
+pub type HashMap<K, V, S> = hashbrown::HashMap<K, V, S, FastAlloc>;
+
+/// See [std::collections::HashSet].
+#[cfg(feature = "nightly")]
+pub type HashSet<T, S> = hashbrown::HashSet<T, S, FastAlloc>;
+
+/// See [std::collections::HashMap].
+#[cfg(not(feature = "nightly"))]
+pub type HashMap<K, V, S> = hashbrown::HashMap<K, V, S>;
+
+#[cfg(not(feature = "nightly"))]
+/// See [std::collections::HashSet].
+pub type HashSet<T, S> = hashbrown::HashSet<T, S>;
+
+/// Used for `FxHashMap` and `FxHashSet`.
+pub type FxBuildHasher = BuildHasherDefault<FxHasher>;
+
+/// Faster `HashMap` which uses `FxHasher`.
+pub type FxHashMap<K, V> = HashMap<K, V, FxBuildHasher>;
+
+/// Faster `HashSet` which uses `FxHasher`.
+pub type FxHashSet<T> = HashSet<T, FxBuildHasher>;

crates/swc_allocator/src/lib.rs

@@ -39,6 +39,7 @@ pub use crate::alloc::Allocator;
 mod alloc;
 #[cfg(feature = "nightly")]
 pub mod boxed;
+pub mod collections;
 #[cfg(feature = "nightly")]
 pub mod vec;
 

crates/swc_ecma_codegen/Cargo.toml

@@ -20,7 +20,6 @@ bench = false
 memchr     = { workspace = true }
 num-bigint = { workspace = true, features = ["serde"] }
 once_cell  = { workspace = true }
-rustc-hash = { workspace = true }
 serde      = { workspace = true }
 sourcemap  = { workspace = true }
 tracing    = { workspace = true }

crates/swc_ecma_codegen/src/lib.rs

@@ -9,6 +9,7 @@ use std::{borrow::Cow, fmt::Write, io};
 
 use memchr::memmem::Finder;
 use once_cell::sync::Lazy;
+use swc_allocator::maybe::vec::Vec;
 use swc_atoms::Atom;
 use swc_common::{
     comments::{CommentKind, Comments},
@@ -44,7 +45,7 @@ pub fn to_code_default(
     comments: Option<&dyn Comments>,
     node: &impl Node,
 ) -> String {
-    let mut buf = Vec::new();
+    let mut buf = std::vec::Vec::new();
     {
         let mut emitter = Emitter {
             cfg: Default::default(),
@@ -4081,7 +4082,7 @@ fn get_ascii_only_ident(sym: &str, may_need_quote: bool, target: EsVersion) -> C
 }
 
 fn get_quoted_utf16(v: &str, ascii_only: bool, target: EsVersion) -> String {
-    let mut buf = String::with_capacity(v.len() + 2);
+    let mut buf = String::with_capacity(v.len() * 12 / 10);
     let mut iter = v.chars().peekable();
 
     let mut single_quote_count = 0;

crates/swc_ecma_codegen/src/tests.rs

@@ -16,7 +16,7 @@ struct Builder {
 }
 
 impl Builder {
-    pub fn with<'a, F, Ret>(self, _: &str, s: &'a mut Vec<u8>, op: F) -> Ret
+    pub fn with<'a, F, Ret>(self, _: &str, s: &'a mut std::vec::Vec<u8>, op: F) -> Ret
     where
         F: for<'aa> FnOnce(&mut Emitter<'aa, Box<(dyn WriteJs + 'aa)>, SourceMap>) -> Ret,
         Ret: 'static,
@@ -44,7 +44,7 @@ impl Builder {
     where
         F: for<'aa> FnOnce(&mut Emitter<'aa, Box<(dyn WriteJs + 'aa)>, SourceMap>),
     {
-        let mut buf = Vec::new();
+        let mut buf = std::vec::Vec::new();
 
         self.with(src, &mut buf, op);
 
@@ -974,7 +974,7 @@ fn run_node(code: &str) -> String {
         JsExecOptions {
             cache: true,
             module: false,
-            args: Vec::new(),
+            args: Default::default(),
         },
     )
     .expect("failed to execute node.js")

crates/swc_ecma_codegen/src/text_writer/basic_impl.rs

@@ -1,7 +1,6 @@
 use std::io::Write;
 
-use rustc_hash::FxHashSet;
-use swc_allocator::maybe::vec::Vec;
+use swc_allocator::{collections::FxHashSet, maybe::vec::Vec};
 use swc_common::{sync::Lrc, BytePos, LineCol, SourceMap, Span};
 
 use super::{Result, WriteJs};

crates/swc_ecma_codegen/tests/sourcemap.rs

@@ -1,9 +1,8 @@
 use std::{fs::read_to_string, path::PathBuf};
 
 use base64::prelude::{Engine, BASE64_STANDARD};
-use rustc_hash::FxHashSet;
 use sourcemap::SourceMap;
-use swc_allocator::maybe::vec::Vec;
+use swc_allocator::{collections::FxHashSet, maybe::vec::Vec};
 use swc_common::{comments::SingleThreadedComments, source_map::SourceMapGenConfig};
 use swc_ecma_ast::EsVersion;
 use swc_ecma_codegen::{text_writer::WriteJs, Emitter};