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LibJS: Add inline caching for adding new own properties to objects

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We already had IC support in PutById for the following cases:
- Changing an existing own property
- Calling a setter located in the prototype chain

This was enough to speed up code where structurally identical objects
(same shape) are processed in a loop:
```js
const arr = [{ a: 1 }, { a: 2 }, { a: 3 }];
for (let obj of arr) {
    obj.a += 1;
}
```

However, creating structurally identical objects in a loop was still
slow:
```js
for (let i = 0; i < 10_000_000; i++) {
    const o = {};
    o.a = 1;
    o.b = 2;
    o.c = 3;
}
```

This change addresses that by adding a new IC type that caches both the
source and target shapes, allowing property additions to be fast-pathed
by directly jumping to the shape that already includes the new property.
This commit is contained in:
Aliaksandr Kalenik 2025-09-15 17:23:39 +02:00 • committed by Andreas Kling
parent a54215c07d
commit d45f8a3081
Notes: github-actions[bot] 2025-09-17 10:45:37 +00:00
21 changed files with 162 additions and 75 deletions
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4
Libraries/LibWeb/HTML/Location.cpp
View file

@ -659,7 +659,7 @@ JS::ThrowCompletionOr<bool> Location::internal_define_own_property(JS::PropertyK
}
// 7.10.5.7 [[Get]] ( P, Receiver ), https://html.spec.whatwg.org/multipage/history.html#location-get
JS::ThrowCompletionOr<JS::Value> Location::internal_get(JS::PropertyKey const& property_key, JS::Value receiver, JS::CacheablePropertyMetadata* cacheable_metadata, PropertyLookupPhase phase) const
JS::ThrowCompletionOr<JS::Value> Location::internal_get(JS::PropertyKey const& property_key, JS::Value receiver, JS::CacheableGetPropertyMetadata* cacheable_metadata, PropertyLookupPhase phase) const
{
auto& vm = this->vm();
@ -672,7 +672,7 @@ JS::ThrowCompletionOr<JS::Value> Location::internal_get(JS::PropertyKey const& p
}
// 7.10.5.8 [[Set]] ( P, V, Receiver ), https://html.spec.whatwg.org/multipage/history.html#location-set
JS::ThrowCompletionOr<bool> Location::internal_set(JS::PropertyKey const& property_key, JS::Value value, JS::Value receiver, JS::CacheablePropertyMetadata* cacheable_metadata, PropertyLookupPhase phase)
JS::ThrowCompletionOr<bool> Location::internal_set(JS::PropertyKey const& property_key, JS::Value value, JS::Value receiver, JS::CacheableSetPropertyMetadata* cacheable_metadata, PropertyLookupPhase phase)
{
auto& vm = this->vm();

4
Libraries/LibWeb/HTML/Location.h
View file

@ -60,8 +60,8 @@ public:
virtual JS::ThrowCompletionOr<bool> internal_prevent_extensions() override;
virtual JS::ThrowCompletionOr<Optional<JS::PropertyDescriptor>> internal_get_own_property(JS::PropertyKey const&) const override;
virtual JS::ThrowCompletionOr<bool> internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor&, Optional<JS::PropertyDescriptor>* precomputed_get_own_property = nullptr) override;
virtual JS::ThrowCompletionOr<JS::Value> internal_get(JS::PropertyKey const&, JS::Value receiver, JS::CacheablePropertyMetadata*, PropertyLookupPhase) const override;
virtual JS::ThrowCompletionOr<bool> internal_set(JS::PropertyKey const&, JS::Value value, JS::Value receiver, JS::CacheablePropertyMetadata*, PropertyLookupPhase) override;
virtual JS::ThrowCompletionOr<JS::Value> internal_get(JS::PropertyKey const&, JS::Value receiver, JS::CacheableGetPropertyMetadata*, PropertyLookupPhase) const override;
virtual JS::ThrowCompletionOr<bool> internal_set(JS::PropertyKey const&, JS::Value value, JS::Value receiver, JS::CacheableSetPropertyMetadata*, PropertyLookupPhase) override;
virtual JS::ThrowCompletionOr<bool> internal_delete(JS::PropertyKey const&) override;
virtual JS::ThrowCompletionOr<GC::RootVector<JS::Value>> internal_own_property_keys() const override;

4
Libraries/LibWeb/HTML/WindowProxy.cpp
View file

@ -154,7 +154,7 @@ JS::ThrowCompletionOr<bool> WindowProxy::internal_define_own_property(JS::Proper
// 7.4.7 [[Get]] ( P, Receiver ), https://html.spec.whatwg.org/multipage/nav-history-apis.html#windowproxy-get
// https://html.spec.whatwg.org/multipage/nav-history-apis.html#windowproxy-get
JS::ThrowCompletionOr<JS::Value> WindowProxy::internal_get(JS::PropertyKey const& property_key, JS::Value receiver, JS::CacheablePropertyMetadata*, PropertyLookupPhase) const
JS::ThrowCompletionOr<JS::Value> WindowProxy::internal_get(JS::PropertyKey const& property_key, JS::Value receiver, JS::CacheableGetPropertyMetadata*, PropertyLookupPhase) const
{
auto& vm = this->vm();
@ -175,7 +175,7 @@ JS::ThrowCompletionOr<JS::Value> WindowProxy::internal_get(JS::PropertyKey const
// 7.4.8 [[Set]] ( P, V, Receiver ), https://html.spec.whatwg.org/multipage/nav-history-apis.html#windowproxy-set
// https://html.spec.whatwg.org/multipage/nav-history-apis.html#windowproxy-set
JS::ThrowCompletionOr<bool> WindowProxy::internal_set(JS::PropertyKey const& property_key, JS::Value value, JS::Value receiver, JS::CacheablePropertyMetadata*, PropertyLookupPhase)
JS::ThrowCompletionOr<bool> WindowProxy::internal_set(JS::PropertyKey const& property_key, JS::Value value, JS::Value receiver, JS::CacheableSetPropertyMetadata*, PropertyLookupPhase)
{
auto& vm = this->vm();

4
Libraries/LibWeb/HTML/WindowProxy.h
View file

@ -28,8 +28,8 @@ public:
virtual JS::ThrowCompletionOr<bool> internal_prevent_extensions() override;
virtual JS::ThrowCompletionOr<Optional<JS::PropertyDescriptor>> internal_get_own_property(JS::PropertyKey const&) const override;
virtual JS::ThrowCompletionOr<bool> internal_define_own_property(JS::PropertyKey const&, JS::PropertyDescriptor&, Optional<JS::PropertyDescriptor>* precomputed_get_own_property = nullptr) override;
virtual JS::ThrowCompletionOr<JS::Value> internal_get(JS::PropertyKey const&, JS::Value receiver, JS::CacheablePropertyMetadata*, PropertyLookupPhase) const override;
virtual JS::ThrowCompletionOr<bool> internal_set(JS::PropertyKey const&, JS::Value value, JS::Value receiver, JS::CacheablePropertyMetadata*, PropertyLookupPhase) override;
virtual JS::ThrowCompletionOr<JS::Value> internal_get(JS::PropertyKey const&, JS::Value receiver, JS::CacheableGetPropertyMetadata*, PropertyLookupPhase) const override;
virtual JS::ThrowCompletionOr<bool> internal_set(JS::PropertyKey const&, JS::Value value, JS::Value receiver, JS::CacheableSetPropertyMetadata*, PropertyLookupPhase) override;
virtual JS::ThrowCompletionOr<bool> internal_delete(JS::PropertyKey const&) override;
virtual JS::ThrowCompletionOr<GC::RootVector<JS::Value>> internal_own_property_keys() const override;