From 7430dee5cfac50be9bc92ff6bc53ca19f4319998 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Wed, 5 Jul 2023 12:51:44 +0200
Subject: [PATCH] LibJS/Bytecode: Make ClassDeclaration not clobber the
 accumulator

2 new passes on test262. :^)
---
 Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp b/Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
index fffe584c9b..ec1ee2d2fc 100644
--- a/Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
+++ b/Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
@@ -2303,8 +2303,13 @@ Bytecode::CodeGenerationErrorOr<void> SwitchStatement::generate_labelled_evaluat
 
 Bytecode::CodeGenerationErrorOr<void> ClassDeclaration::generate_bytecode(Bytecode::Generator& generator) const
 {
+    auto accumulator_backup_reg = generator.allocate_register();
+    generator.emit<Bytecode::Op::Store>(accumulator_backup_reg);
+
     TRY(m_class_expression->generate_bytecode(generator));
     generator.emit<Bytecode::Op::SetVariable>(generator.intern_identifier(m_class_expression.ptr()->name()), Bytecode::Op::SetVariable::InitializationMode::Initialize);
+
+    generator.emit<Bytecode::Op::Load>(accumulator_backup_reg);
     return {};
 }