From a2b7e04da30fbcf4785d941f66e706e5b2cbbf2a Mon Sep 17 00:00:00 2001
From: Andreas Kling <andreas@ladybird.org>
Date: Mon, 28 Apr 2025 21:25:28 +0200
Subject: [PATCH] LibJS: Defer looking up the realm in
 ordinary_call_evaluate_body()

We don't actually need the realm for normal function calls, so we
can avoid looking it up on the EC stack in that case.
---
 Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp b/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
index a67a622bf5e..f4887e07241 100644
--- a/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
+++ b/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
@@ -901,8 +901,6 @@ template void async_function_start(VM&, PromiseCapability const&, GC::Function<C
 // 15.8.4 Runtime Semantics: EvaluateAsyncFunctionBody, https://tc39.es/ecma262/#sec-runtime-semantics-evaluatefunctionbody
 ThrowCompletionOr<Value> ECMAScriptFunctionObject::ordinary_call_evaluate_body(VM& vm)
 {
-    auto& realm = *vm.current_realm();
-
     auto result_and_frame = vm.bytecode_interpreter().run_executable(*m_bytecode_executable, {});
 
     if (result_and_frame.value.is_error()) [[unlikely]] {
@@ -916,6 +914,7 @@ ThrowCompletionOr<Value> ECMAScriptFunctionObject::ordinary_call_evaluate_body(V
     if (kind() == FunctionKind::Normal)
         return result;
 
+    auto& realm = *vm.current_realm();
     if (kind() == FunctionKind::AsyncGenerator) {
         auto async_generator_object = TRY(AsyncGenerator::create(realm, result, this, vm.running_execution_context().copy()));
         return async_generator_object;