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LibJS: Pre-calculate the number of bindings for function environments

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We can use `ensure_capacity` for binding vectors if we know their sizes
in advance. This ensures that binding vectors aren't reallocated during
the `function_declaration_instantiation` execution.

With this change, `try_grow_capacity()` and `shrink_to_fit()` are no
longer visible in the `function_declaration_instantiation()` profiles
when running React-Redux-TodoMVC from Speedometer.
This commit is contained in:
Aliaksandr Kalenik 2023-09-20 01:32:07 +02:00 • committed by Andreas Kling
parent 98f479318a
commit 42e9dfedc2
3 changed files with 78 additions and 0 deletions
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4
Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.h
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@ -152,6 +152,10 @@ private:
bool m_arguments_object_needed { false };
Vector<VariableNameToInitialize> m_var_names_to_initialize_binding;
Vector<DeprecatedFlyString> m_function_names_to_initialize_binding;
size_t m_function_environment_bindings_count { 0 };
size_t m_var_environment_bindings_count { 0 };
size_t m_lex_environment_bindings_count { 0 };
};
template<>