webbeef 87daffa1fd script: Use a u16 for prototype id to speed up Castable::is<T>() (#44364) ...

`Castable::is<T>()` calls `get_dom_class()` in a way that incurs a
roundtrip to the JS engine and
multiple pointer indirections:

self.reflector().get_jsobject().get()  -> JSObject
Object.shape -> BaseShape.clasp    -> JSClass
DOMJSClass.dom_class              -> DOMClass
interface_chain[depth] == ID       -> bool

Since the ID doesn't change after creation of reflectors, we can instead
store the ID on the reflector
and avoid most of that cost. The trick is to use a Depth First Search to
generate IDs that allow a
range check for `Castable::is<T>`. An example of IDs in the DFS looks
like:

EventTarget = 0
  Node = 1
    CharacterData = 2
      Text = 3
      CDATASection = 4
      Comment = 5
      ProcessingInstruction = 6
    Document = 7
      HTMLDocument = 8
      XMLDocument = 9

Testing: Green try run at
https://github.com/webbeef/servo/actions/runs/24640508040 and manual
testing with general browsing.

Signed-off-by: webbeef <me@webbeef.org>

2026-04-25 07:54:35 +00:00

..

deny_public_fields

Use workspace deps consistently and add version requirement (#43243)

2026-03-14 06:51:33 +00:00

malloc_size_of

Explicitly set publish = false for test crates (#43078)

2026-03-07 10:40:39 +00:00

profile

cargo: Use kebab case consistenly for those already starting with servo- (#43516)

2026-03-21 10:57:22 +00:00

script

script: Use a u16 for prototype id to speed up Castable::is<T>() (#44364)

2026-04-25 07:54:35 +00:00

style

Upgrade Stylo to 2026-04-01 (#43878)

2026-04-03 00:03:25 +00:00