feat: v8 profiling

.gitignore

@@ -9,3 +9,4 @@ profile.json.gz
 prof.json
 *.cpuprofile
 *.cpuprofile.gz
+*v8.log

Justfile

@@ -21,3 +21,11 @@
 [no-exit-message]
 @evali expr:
   cargo run --release --features inspector -- --inspect-brk 127.0.0.1:9229 eval --expr '{{expr}}'
+
+[no-exit-message]
+@replp:
+  cargo run --release --features prof -- repl
+
+[no-exit-message]
+@evalp expr:
+  cargo run --release --features prof -- eval --expr '{{expr}}'

nix-js/Cargo.toml

@@ -76,6 +76,7 @@ uuid = { version = "1", features = ["v4"], optional = true }
 
 [features]
 inspector = ["dep:fastwebsockets", "dep:hyper", "dep:hyper-util", "dep:http-body-util", "dep:http", "dep:uuid"]
+prof = []
 
 [dev-dependencies]
 criterion = { version = "0.8", features = ["html_reports"] }

nix-js/src/runtime.rs

@@ -142,7 +142,12 @@ impl<Ctx: RuntimeContext> Runtime<Ctx> {
         static INIT: Once = Once::new();
         INIT.call_once(|| {
             assert_eq!(
-                deno_core::v8_set_flags(vec!["".into(), format!("--stack-size={}", 8 * 1024)]),
+                deno_core::v8_set_flags(vec![
+                    "".into(),
+                    format!("--stack-size={}", 8 * 1024),
+                    #[cfg(feature = "prof")]
+                    ("--prof".into())
+                ]),
                 [""]
             );
             JsRuntime::init_platform(Some(v8::new_default_platform(0, false).make_shared()));