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bd6750aaa5
...when Array.prototype and Object.prototype are intact.
If `internal_set()` is called on an array exotic object with a numeric
PropertyKey, and:
- the prototype chain has not been modified (i.e., there are no getters
or setters for indexed properties), and
- the array is not the target of a Proxy object,
then we can directly store the value in the receiver's indexed
properties, without checking whether it already exists somewhere in the
prototype chain.
1.7x improvement on the following program:
```js
function f() {
let a = [];
let i = 0;
while (i < 10_000_000) {
a.push(i);
i++;
}
}
f();
```
58 lines
2.2 KiB
C++
58 lines
2.2 KiB
C++
/*
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* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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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 <LibJS/Runtime/Array.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::WebIDL {
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// https://webidl.spec.whatwg.org/#idl-observable-array
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class ObservableArray final : public JS::Array {
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JS_OBJECT(ObservableArray, JS::Array);
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GC_DECLARE_ALLOCATOR(ObservableArray);
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public:
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static GC::Ref<ObservableArray> create(JS::Realm& realm);
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virtual JS::ThrowCompletionOr<bool> internal_set(JS::PropertyKey const& property_key, JS::Value value, JS::Value receiver, JS::CacheablePropertyMetadata* metadata = nullptr, PropertyLookupPhase = PropertyLookupPhase::OwnProperty) override;
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virtual JS::ThrowCompletionOr<bool> internal_delete(JS::PropertyKey const& property_key) override;
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using SetAnIndexedValueCallbackFunction = Function<ExceptionOr<void>(JS::Value&)>;
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using DeleteAnIndexedValueCallbackFunction = Function<ExceptionOr<void>(JS::Value)>;
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void set_on_set_an_indexed_value_callback(SetAnIndexedValueCallbackFunction&& callback);
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void set_on_delete_an_indexed_value_callback(DeleteAnIndexedValueCallbackFunction&& callback);
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JS::ThrowCompletionOr<void> append(JS::Value value);
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void clear();
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template<typename T, typename Callback>
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void for_each(Callback callback)
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{
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for (auto& entry : indexed_properties()) {
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auto value_and_attributes = indexed_properties().storage()->get(entry.index());
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if (value_and_attributes.has_value()) {
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auto& style_sheet = as<T>(value_and_attributes->value.as_object());
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callback(style_sheet);
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}
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}
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}
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explicit ObservableArray(JS::Realm&, Object& prototype);
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virtual void visit_edges(JS::Cell::Visitor&) override;
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private:
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using SetAnIndexedValueCallbackHeapFunction = GC::Function<SetAnIndexedValueCallbackFunction::FunctionType>;
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using DeleteAnIndexedValueCallbackHeapFunction = GC::Function<DeleteAnIndexedValueCallbackFunction::FunctionType>;
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GC::Ptr<SetAnIndexedValueCallbackHeapFunction> m_on_set_an_indexed_value;
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GC::Ptr<DeleteAnIndexedValueCallbackHeapFunction> m_on_delete_an_indexed_value;
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};
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}
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