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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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18
Libraries/LibJS/Runtime/ECMAScriptFunctionObject.h
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@ -152,11 +152,13 @@ public:
[[nodiscard]] ByteString const& source_text() const { return shared_data().m_source_text; }
void set_source_text(ByteString source_text) { const_cast<SharedFunctionInstanceData&>(shared_data()).m_source_text = move(source_text); }
Vector<ClassFieldDefinition> const& fields() const { return m_fields; }
void add_field(ClassFieldDefinition field) { m_fields.append(move(field)); }
Vector<ClassFieldDefinition> const& fields() const { return ensure_class_data().fields; }
void add_field(ClassFieldDefinition field) { ensure_class_data().fields.append(move(field)); }
Vector<PrivateElement> const& private_methods() const { return m_private_methods; }
void add_private_method(PrivateElement method) { m_private_methods.append(move(method)); }
Vector<PrivateElement> const& private_methods() const { return ensure_class_data().private_methods; }
void add_private_method(PrivateElement method) { ensure_class_data().private_methods.append(move(method)); }
[[nodiscard]] bool has_class_data() const { return m_class_data; }
// This is for IsSimpleParameterList (static semantics)
bool has_simple_parameter_list() const { return shared_data().m_has_simple_parameter_list; }
@ -211,8 +213,12 @@ private:
GC::Ptr<Realm> m_realm; // [[Realm]]
ScriptOrModule m_script_or_module; // [[ScriptOrModule]]
GC::Ptr<Object> m_home_object; // [[HomeObject]]
Vector<ClassFieldDefinition> m_fields; // [[Fields]]
Vector<PrivateElement> m_private_methods; // [[PrivateMethods]]
struct ClassData {
Vector<ClassFieldDefinition> fields; // [[Fields]]
Vector<PrivateElement> private_methods; // [[PrivateMethods]]
};
ClassData& ensure_class_data() const;
mutable OwnPtr<ClassData> m_class_data;
};
template<>