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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/FunctionObject.h
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@ -40,7 +40,7 @@ public:
virtual Vector<FlyString> const& local_variables_names() const { VERIFY_NOT_REACHED(); }
virtual Vector<FunctionParameter> const& formal_parameters() const { VERIFY_NOT_REACHED(); }
virtual NonnullRefPtr<FunctionParameters const> const& formal_parameters() const { VERIFY_NOT_REACHED(); }
protected:
explicit FunctionObject(Realm&, Object* prototype, MayInterfereWithIndexedPropertyAccess = MayInterfereWithIndexedPropertyAccess::No);