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LibJS: Use premade shape when creating mapped arguments objects

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Knocks out a 0.4% profile item on Speedometer 3.
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Andreas Kling 2025-04-18 18:11:10 +02:00 • committed by Andreas Kling
commit e0b32b1863
Notes: github-actions[bot] 2025-04-18 23:14:55 +00:00
4 changed files with 25 additions and 5 deletions
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10
Libraries/LibJS/Runtime/Intrinsics.cpp
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@ -229,6 +229,15 @@ void Intrinsics::initialize_intrinsics(Realm& realm)
m_unmapped_arguments_object_well_known_symbol_iterator_offset = m_unmapped_arguments_object_shape->lookup(StringOrSymbol(vm.well_known_symbol_iterator())).value().offset;
m_unmapped_arguments_object_callee_offset = m_unmapped_arguments_object_shape->lookup(vm.names.callee.to_string_or_symbol()).value().offset;
m_mapped_arguments_object_shape = heap().allocate<Shape>(realm);
m_mapped_arguments_object_shape->set_prototype_without_transition(m_object_prototype);
m_mapped_arguments_object_shape->add_property_without_transition(vm.names.length, Attribute::Writable | Attribute::Configurable);
m_mapped_arguments_object_shape->add_property_without_transition(vm.well_known_symbol_iterator(), Attribute::Writable | Attribute::Configurable);
m_mapped_arguments_object_shape->add_property_without_transition(vm.names.callee, Attribute::Writable | Attribute::Configurable);
m_mapped_arguments_object_length_offset = m_mapped_arguments_object_shape->lookup(vm.names.length.to_string_or_symbol()).value().offset;
m_mapped_arguments_object_well_known_symbol_iterator_offset = m_mapped_arguments_object_shape->lookup(StringOrSymbol(vm.well_known_symbol_iterator())).value().offset;
m_mapped_arguments_object_callee_offset = m_mapped_arguments_object_shape->lookup(vm.names.callee.to_string_or_symbol()).value().offset;
// Normally Realm::create() takes care of this, but these are allocated via Heap::allocate().
m_function_prototype->initialize(realm);
m_object_prototype->initialize(realm);
@ -406,6 +415,7 @@ void Intrinsics::visit_edges(Visitor& visitor)
visitor.visit(m_normal_function_shape);
visitor.visit(m_native_function_shape);
visitor.visit(m_unmapped_arguments_object_shape);
visitor.visit(m_mapped_arguments_object_shape);
visitor.visit(m_proxy_constructor);
visitor.visit(m_async_from_sync_iterator_prototype);
visitor.visit(m_async_generator_prototype);