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LibJS: Keep parsed function parameters in a shared data structure

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Instead of making a copy of the Vector<FunctionParameter> from the AST
every time we instantiate an ECMAScriptFunctionObject, we now keep the
parameters in a ref-counted FunctionParameters object.

This reduces memory usage, and also allows us to cache the bytecode
executables for default parameter expressions without recompiling them
for every instantiation. :^)
This commit is contained in:
Andreas Kling 2025-03-27 12:59:50 +00:00 • committed by Jelle Raaijmakers
commit 7477002e46
Notes: github-actions[bot] 2025-03-27 15:02:02 +00:00
11 changed files with 68 additions and 38 deletions
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2
Libraries/LibJS/Runtime/AbstractOperations.h
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@ -43,7 +43,7 @@ bool is_compatible_property_descriptor(bool extensible, PropertyDescriptor const
bool validate_and_apply_property_descriptor(Object*, PropertyKey const&, bool extensible, PropertyDescriptor const&, Optional<PropertyDescriptor> const& current);
ThrowCompletionOr<Object*> get_prototype_from_constructor(VM&, FunctionObject const& constructor, GC::Ref<Object> (Intrinsics::*intrinsic_default_prototype)());
Object* create_unmapped_arguments_object(VM&, ReadonlySpan<Value> arguments);
Object* create_mapped_arguments_object(VM&, FunctionObject&, Vector<FunctionParameter> const&, ReadonlySpan<Value> arguments, Environment&);
Object* create_mapped_arguments_object(VM&, FunctionObject&, NonnullRefPtr<FunctionParameters const> const&, ReadonlySpan<Value> arguments, Environment&);
// 2.1.1 DisposeCapability Records, https://tc39.es/proposal-explicit-resource-management/#sec-disposecapability-records
struct DisposeCapability {