expose instruction count directly:

boa_engine/src/context/mod.rs

@@ -93,7 +93,7 @@ pub struct Context<'host> {
 
     /// Number of instructions remaining before a forced exit
     #[cfg(feature = "fuzz")]
-    pub(crate) instructions_remaining: usize,
+    pub instructions_remaining: usize,
 
     pub(crate) vm: Vm,
 
@@ -519,6 +519,18 @@ impl<'host> Context<'host> {
     pub const fn instructions_remaining(&self) -> u64 {
         self.instructions_remaining
     }
+
+    /// Create a new Realm with the default global bindings.
+    pub fn create_realm(&mut self) -> JsResult<Realm> {
+        let realm = Realm::create(&*self.host_hooks, &self.root_shape);
+
+        let old_realm = self.enter_realm(realm);
+
+        builtins::set_default_global_bindings(self)?;
+
+        Ok(self.enter_realm(old_realm))
+    }
+
     /// Get the [`RootShape`].
     #[inline]
     #[must_use]