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LibJS: Make class-specific members of ESFO lazily allocated

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We don't need the [[Fields]] and [[PrivateMethods]] slots for most ESFO
instances, so let's reduce their impact on class size!

This shrinks ESFO from 200 bytes to 160 bytes, allowing more allocations
before we have to collect garbage.
This commit is contained in:
Andreas Kling 2025-04-08 13:39:07 +02:00 • committed by Andreas Kling
parent 2a9b6f1d97
commit 4593e19bcf
Notes: github-actions[bot] 2025-04-08 16:53:42 +00:00
3 changed files with 40 additions and 20 deletions
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4
Libraries/LibJS/Runtime/Object.cpp
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@ -699,6 +699,10 @@ ThrowCompletionOr<void> Object::define_field(ClassFieldDefinition const& field)
// 7.3.34 InitializeInstanceElements ( O, constructor ), https://tc39.es/ecma262/#sec-initializeinstanceelements
ThrowCompletionOr<void> Object::initialize_instance_elements(ECMAScriptFunctionObject& constructor)
{
// AD-HOC: Avoid lazy instantiation of ECMAScriptFunctionObject::ClassData.
if (!constructor.has_class_data())
return {};
// 1. Let methods be the value of constructor.[[PrivateMethods]].
// 2. For each PrivateElement method of methods, do
for (auto const& method : constructor.private_methods()) {