chore: bench source map clone/parse/stringify (#176)

Author: SyMind

benches/bench.rs

@@ -1,6 +1,7 @@
 #![allow(missing_docs)]
 
 mod bench_complex_replace_source;
+mod bench_source_map;
 
 use std::collections::HashMap;
 
@@ -16,6 +17,10 @@ use rspack_sources::{
 };
 
 use bench_complex_replace_source::benchmark_complex_replace_source;
+use bench_source_map::{
+  benchmark_parse_source_map_from_json, benchmark_source_map_clone,
+  benchmark_stringify_source_map_to_json,
+};
 
 const HELLOWORLD_JS: &str = include_str!(concat!(
   env!("CARGO_MANIFEST_DIR"),
@@ -41,14 +46,6 @@ const BUNDLE_JS_MAP: &str = include_str!(concat!(
   env!("CARGO_MANIFEST_DIR"),
   "/benches/fixtures/transpile-rollup/files/bundle.js.map"
 ));
-const ANTD_MIN_JS: &str = include_str!(concat!(
-  env!("CARGO_MANIFEST_DIR"),
-  "/benches/fixtures/antd-mini/antd.min.js"
-));
-const ANTD_MIN_JS_MAP: &str = include_str!(concat!(
-  env!("CARGO_MANIFEST_DIR"),
-  "/benches/fixtures/antd-mini/antd.min.js.map"
-));
 
 fn benchmark_concat_generate_string(b: &mut Bencher) {
   let sms_minify = SourceMapSource::new(SourceMapSourceOptions {
@@ -251,6 +248,18 @@ fn bench_rspack_sources(criterion: &mut Criterion) {
   group
     .bench_function("complex_replace_source", benchmark_complex_replace_source);
 
+  group.bench_function(
+    "parse_source_map_from_json",
+    benchmark_parse_source_map_from_json,
+  );
+
+  group.bench_function("source_map_clone", benchmark_source_map_clone);
+
+  group.bench_function(
+    "stringify_source_map_to_json",
+    benchmark_stringify_source_map_to_json,
+  );
+
   group.finish();
 }
 

benches/bench_source_map.rs

@@ -0,0 +1,34 @@
+#![allow(missing_docs)]
+
+#[cfg(not(codspeed))]
+pub use criterion::*;
+
+#[cfg(codspeed)]
+pub use codspeed_criterion_compat::*;
+
+use rspack_sources::SourceMap;
+
+const ANTD_MIN_JS_MAP: &str = include_str!(concat!(
+  env!("CARGO_MANIFEST_DIR"),
+  "/benches/fixtures/antd-mini/antd.min.js.map"
+));
+
+pub fn benchmark_parse_source_map_from_json(b: &mut Bencher) {
+  b.iter(|| {
+    black_box(SourceMap::from_json(black_box(ANTD_MIN_JS_MAP)).unwrap())
+  })
+}
+
+pub fn benchmark_source_map_clone(b: &mut Bencher) {
+  let source = SourceMap::from_json(ANTD_MIN_JS_MAP).unwrap();
+  b.iter(|| {
+    let _ = black_box(source.clone());
+  })
+}
+
+pub fn benchmark_stringify_source_map_to_json(b: &mut Bencher) {
+  let source = SourceMap::from_json(ANTD_MIN_JS_MAP).unwrap();
+  b.iter(|| {
+    let _ = black_box(source.to_json().unwrap());
+  })
+}

src/source.rs

@@ -419,7 +419,7 @@ impl SourceMap {
   }
 
   /// Generate source map to a json string.
-  pub fn to_json(self) -> Result<String> {
+  pub fn to_json(&self) -> Result<String> {
     let json = simd_json::serde::to_string(&self)?;
     Ok(json)
   }