From c3c39bda0cbb0a96e2033436dc48d6d7a01b14e1 Mon Sep 17 00:00:00 2001
From: imxyy_soope_ <imxyy1soope1@gmail.com>
Date: Wed, 18 Feb 2026 13:03:40 +0800
Subject: [PATCH] feat: v8 profiling

---
 .gitignore            | 1 +
 Justfile              | 8 ++++++++
 nix-js/Cargo.toml     | 1 +
 nix-js/src/runtime.rs | 7 ++++++-
 4 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 673b44c..fc5394b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ profile.json.gz
 prof.json
 *.cpuprofile
 *.cpuprofile.gz
+*v8.log
diff --git a/Justfile b/Justfile
index 3b74586..afc96a7 100644
--- a/Justfile
+++ b/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}}'
diff --git a/nix-js/Cargo.toml b/nix-js/Cargo.toml
index d0b9baf..2456952 100644
--- a/nix-js/Cargo.toml
+++ b/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"] }
diff --git a/nix-js/src/runtime.rs b/nix-js/src/runtime.rs
index 1e4b1df..0124fed 100644
--- a/nix-js/src/runtime.rs
+++ b/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()));