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LibJS: Move computation out of the ECMAScriptFunctionObject constructor

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We were doing way too much computation every time an ESFO was
instantiated. This was particularly sad, since the results of these
computations were identical every time!

This patch adds a new SharedFunctionInstanceData object that gets
shared between all instances of an ESFO instantiated from some kind of
AST FunctionNode.

~5% speedup on Speedometer 2.1 :^)
This commit is contained in:
Andreas Kling 2025-04-08 00:45:27 +02:00 • committed by Andreas Kling
parent 4209b18b88
commit 2a9b6f1d97
Notes: github-actions[bot] 2025-04-08 16:53:53 +00:00
7 changed files with 367 additions and 258 deletions
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4
Libraries/LibJS/Runtime/AbstractOperations.cpp
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@ -426,7 +426,7 @@ GC::Ref<FunctionEnvironment> new_function_environment(ECMAScriptFunctionObject&
env->set_function_object(function);
// 3. If F.[[ThisMode]] is lexical, set env.[[ThisBindingStatus]] to lexical.
if (function.this_mode() == ECMAScriptFunctionObject::ThisMode::Lexical)
if (function.this_mode() == ThisMode::Lexical)
env->set_this_binding_status(FunctionEnvironment::ThisBindingStatus::Lexical);
// 4. Else, set env.[[ThisBindingStatus]] to uninitialized.
else
@ -555,7 +555,7 @@ ThrowCompletionOr<Value> perform_eval(VM& vm, Value x, CallerMode strict_caller,
in_method = this_function_environment_record.has_super_binding();
// iv. If F.[[ConstructorKind]] is derived, set inDerivedConstructor to true.
if (function.constructor_kind() == ECMAScriptFunctionObject::ConstructorKind::Derived)
if (function.constructor_kind() == ConstructorKind::Derived)
in_derived_constructor = true;
// v. Let classFieldInitializerName be F.[[ClassFieldInitializerName]].