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https://github.com/LadybirdBrowser/ladybird.git
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c5427e5f4e
Replace individual bool bitfields in Object (m_is_extensible, m_has_parameter_map, m_has_magical_length_property, etc.) with a single u8 m_flags field and Flag:: constants. This consolidates 8 scattered bitfields into one byte with explicit bit positions, making them easy to access from generated assembly code at a known offset. It also converts the virtual is_function() and is_ecmascript_function_object() methods to flag-based checks, avoiding virtual dispatch for these hot queries. ProxyObject now explicitly clears the IsFunction flag in its constructor when wrapping a non-callable target, instead of relying on a virtual is_function() override.
65 lines
2.8 KiB
C++
65 lines
2.8 KiB
C++
/*
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* Copyright (c) 2020-2025, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Optional.h>
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#include <AK/StringView.h>
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#include <LibJS/Bytecode/Builtins.h>
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#include <LibJS/LocalVariable.h>
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#include <LibJS/Runtime/Object.h>
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#include <LibJS/Runtime/PrivateEnvironment.h>
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#include <LibJS/Runtime/PropertyKey.h>
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namespace JS {
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class FunctionObject : public Object {
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JS_OBJECT(FunctionObject, Object);
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public:
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virtual ~FunctionObject() = default;
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// Table 5: Additional Essential Internal Methods of Function Objects, https://tc39.es/ecma262/#table-additional-essential-internal-methods-of-function-objects
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virtual void get_stack_frame_size([[maybe_unused]] size_t& registers_and_locals_count, [[maybe_unused]] size_t& constants_count, [[maybe_unused]] size_t& argument_count) { }
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virtual ThrowCompletionOr<Value> internal_call(ExecutionContext&, Value this_argument) = 0;
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virtual ThrowCompletionOr<GC::Ref<Object>> internal_construct(ExecutionContext&, [[maybe_unused]] FunctionObject& new_target) { VERIFY_NOT_REACHED(); }
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void set_function_name(Variant<PropertyKey, PrivateName> const& name_arg, Optional<StringView> const& prefix = {});
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void set_function_length(double length);
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virtual bool is_strict_mode() const { return false; }
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virtual bool has_constructor() const { return false; }
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// [[Realm]]
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virtual Realm* realm() const { return nullptr; }
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virtual Vector<LocalVariable> const& local_variables_names() const { VERIFY_NOT_REACHED(); }
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virtual Utf16String name_for_call_stack() const = 0;
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bool is_array_prototype_next_builtin() const { return m_builtin.has_value() && *m_builtin == Bytecode::Builtin::ArrayIteratorPrototypeNext; }
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bool is_map_prototype_next_builtin() const { return m_builtin.has_value() && *m_builtin == Bytecode::Builtin::MapIteratorPrototypeNext; }
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bool is_set_prototype_next_builtin() const { return m_builtin.has_value() && *m_builtin == Bytecode::Builtin::SetIteratorPrototypeNext; }
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bool is_string_prototype_next_builtin() const { return m_builtin.has_value() && *m_builtin == Bytecode::Builtin::StringIteratorPrototypeNext; }
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Optional<Bytecode::Builtin> builtin() const { return m_builtin; }
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protected:
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explicit FunctionObject(Realm&, Object* prototype, MayInterfereWithIndexedPropertyAccess = MayInterfereWithIndexedPropertyAccess::No);
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explicit FunctionObject(Object& prototype, MayInterfereWithIndexedPropertyAccess = MayInterfereWithIndexedPropertyAccess::No);
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[[nodiscard]] GC::Ref<PrimitiveString> make_function_name(Variant<PropertyKey, PrivateName> const&, Optional<StringView> const& prefix);
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Optional<Bytecode::Builtin> m_builtin;
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};
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template<>
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inline bool Object::fast_is<FunctionObject>() const { return is_function(); }
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}
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