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285bc005cb
Before this change each built-in iterator object has a boolean `m_next_method_was_redefined`. If user code later changed the iterator’s prototype (e.g. `Object.setPrototypeOf()`), we still believed the built-in fast-path was safe and skipped the user supplied override, producing wrong results. With this change `BuiltinIterator::as_builtin_iterator_if_next_is_not_redefined()` looks up the current `next` property and verifies that it is still the built-in native function.
74 lines
3.4 KiB
C++
74 lines
3.4 KiB
C++
/*
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* Copyright (c) 2020, 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/Badge.h>
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#include <AK/Optional.h>
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#include <LibGC/Function.h>
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#include <LibJS/Bytecode/Builtins.h>
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#include <LibJS/Runtime/Completion.h>
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#include <LibJS/Runtime/FunctionObject.h>
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#include <LibJS/Runtime/PropertyKey.h>
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namespace JS {
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class NativeFunction : public FunctionObject {
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JS_OBJECT(NativeFunction, FunctionObject);
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GC_DECLARE_ALLOCATOR(NativeFunction);
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public:
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static GC::Ref<NativeFunction> create(Realm&, ESCAPING Function<ThrowCompletionOr<Value>(VM&)> behaviour, i32 length, PropertyKey const& name = FlyString {}, Optional<Realm*> = {}, Optional<StringView> const& prefix = {}, Optional<Bytecode::Builtin> builtin = {});
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static GC::Ref<NativeFunction> create(Realm&, FlyString const& name, ESCAPING Function<ThrowCompletionOr<Value>(VM&)>);
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virtual ~NativeFunction() override = default;
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virtual ThrowCompletionOr<Value> internal_call(ExecutionContext&, Value this_argument) override;
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virtual ThrowCompletionOr<GC::Ref<Object>> internal_construct(ReadonlySpan<Value> arguments_list, FunctionObject& new_target) override;
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// Used for [[Call]] / [[Construct]]'s "...result of evaluating F in a manner that conforms to the specification of F".
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// Needs to be overridden by all NativeFunctions without an m_native_function.
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virtual ThrowCompletionOr<Value> call();
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virtual ThrowCompletionOr<GC::Ref<Object>> construct(FunctionObject& new_target);
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FlyString const& name() const { return m_name; }
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virtual bool is_strict_mode() const override;
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virtual bool has_constructor() const override { return false; }
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virtual Realm* realm() const override { return m_realm; }
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Optional<FlyString> const& initial_name() const { return m_initial_name; }
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void set_initial_name(Badge<FunctionObject>, FlyString initial_name) { m_initial_name = move(initial_name); }
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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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protected:
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NativeFunction(FlyString name, Object& prototype);
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NativeFunction(AK::Function<ThrowCompletionOr<Value>(VM&)>, Object* prototype, Realm& realm, Optional<Bytecode::Builtin> builtin);
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NativeFunction(FlyString name, AK::Function<ThrowCompletionOr<Value>(VM&)>, Object& prototype);
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explicit NativeFunction(Object& prototype);
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virtual void initialize(Realm&) override;
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virtual void visit_edges(Cell::Visitor& visitor) override;
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private:
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virtual bool is_native_function() const final { return true; }
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FlyString m_name;
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GC::Ptr<PrimitiveString> m_name_string;
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Optional<FlyString> m_initial_name; // [[InitialName]]
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Optional<Bytecode::Builtin> m_builtin;
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AK::Function<ThrowCompletionOr<Value>(VM&)> m_native_function;
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GC::Ptr<Realm> m_realm;
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};
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template<>
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inline bool Object::fast_is<NativeFunction>() const { return is_native_function(); }
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}
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