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451c947c3f
Before this change, PropertyNameIterator (used by for..in) and `Object::enumerable_own_property_names()` (used by `Object.keys()`, `Object.values()`, and `Object.entries()`) enumerated an object's own enumerable properties exactly as the spec prescribes: - Call `internal_own_property_keys()`, allocating a list of JS::Value keys. - For each key, call internal_get_own_property() to obtain a descriptor and check `[[Enumerable]]`. While that is required in the general case (e.g. for Proxy objects or platform/exotic objects that override `[[OwnPropertyKeys]]`), it's overkill for ordinary JS objects that store their own properties in the shape table and indexed-properties storage. This change introduces `for_each_own_property_with_enumerability()`, which, for objects where `eligible_for_own_property_enumeration_fast_path()` is `true`, lets us read the enumerability directly from shape metadata (and from indexed-properties storage) without a per-property descriptor lookup. When we cannot avoid `internal_get_own_property()`, we still benefit by skipping the temporary `Vector<Value>` of keys and avoiding the unnecessary round-trip between PropertyKey and Value. |
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| AggregateError | ||
| Array | ||
| ArrayBuffer | ||
| AsyncDisposableStack | ||
| AsyncGenerator | ||
| Atomics | ||
| BigInt | ||
| Boolean | ||
| DataView | ||
| Date | ||
| DisposableStack | ||
| Error | ||
| FinalizationRegistry | ||
| Function | ||
| functions | ||
| Infinity | ||
| Intl | ||
| Iterator | ||
| JSON | ||
| Map | ||
| Math | ||
| NaN | ||
| Number | ||
| Object | ||
| Promise | ||
| Proxy | ||
| Reflect | ||
| RegExp | ||
| Set | ||
| ShadowRealm | ||
| SharedArrayBuffer | ||
| String | ||
| SuppressedError | ||
| Symbol | ||
| Temporal | ||
| TypedArray | ||
| WeakMap | ||
| WeakRef | ||
| WeakSet | ||