Check `is_live_heap_block()` before touching the cell, and also drop
cached entries that survived the block but are unmarked, matching the
pattern used elsewhere.
The element cache used `GC::Weak<Element>`, paying for a `WeakImpl`
allocation per cached element on every cache rebuild.
This get's rid of a 4% profile item when toggling state on
https://diskprices.com
Previously, the LibWeb bindings generator would output multiple per
interface files like Prototype/Constructor/Namespace/GlobalMixin
depending on the contents of that IDL file.
This complicates the build system as it means that it does not know
what files will be generated without knowledge of the contents of that
IDL file.
Instead, for each IDL file only generate a single Bindings/<IDLFile>.h
and Bindings/<IDLFile>.cpp.
This avoids keeping elements cached in an HTMLCollection alive longer
than necessary in the following scenario:
1. The HTMLCollection cache is populated by querying it.
2. Elements that were included in the cache are removed from the DOM.
3. The cached elements are kept alive by strong references in the cache
until it is updated, which might never happen.
Before this change, we were going through the chain of base classes for
each IDL interface object and having them set the prototype to their
prototype.
Instead of doing that, reorder things so that we set the right prototype
immediately in Foo::initialize(), and then don't bother in all the base
class overrides.
This knocks off a ~1% profile item on Speedometer 3.
Resulting in a massive rename across almost everywhere! Alongside the
namespace change, we now have the following names:
* JS::NonnullGCPtr -> GC::Ref
* JS::GCPtr -> GC::Ptr
* JS::HeapFunction -> GC::Function
* JS::CellImpl -> GC::Cell
* JS::Handle -> GC::Root
The main motivation behind this is to remove JS specifics of the Realm
from the implementation of the Heap.
As a side effect of this change, this is a bit nicer to read than the
previous approach, and in my opinion, also makes it a little more clear
that this method is specific to a JavaScript Realm.
