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LibWeb: Add fast-paths for wrapping already-wrapped C++ objects

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If a C++ object already has a JS wrapper, we don't need to go through
the expensive type checks to figure out which kind of wrapper to create.
Instead, just return the wrapper we already have!

This gives a noticeable increase in smoothness on Acid3, where ~10% of
CPU time was previously spent doing RTTI type checks in wrap(). With
these changes, it's down to ~1%.
This commit is contained in:
Andreas Kling 2022-03-27 03:19:32 +02:00
parent 5c5e4b5ae5
commit 269f9c6863
3 changed files with 9 additions and 0 deletions
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3
Userland/Libraries/LibWeb/Bindings/CSSRuleWrapperFactory.cpp
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@ -14,6 +14,9 @@ namespace Web::Bindings {
CSSRuleWrapper* wrap(JS::GlobalObject& global_object, CSS::CSSRule& rule)
{
if (rule.wrapper())
return static_cast<CSSRuleWrapper*>(rule.wrapper());
if (is<CSS::CSSStyleRule>(rule))
return static_cast<CSSRuleWrapper*>(wrap_impl(global_object, verify_cast<CSS::CSSStyleRule>(rule)));
return static_cast<CSSRuleWrapper*>(wrap_impl(global_object, rule));