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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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5
Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.h
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@ -60,6 +60,11 @@ public:
void shrink_to_fit();
void ensure_capacity(size_t needed_capacity)
{
m_bindings.ensure_capacity(needed_capacity);
}
[[nodiscard]] u64 environment_serial_number() const { return m_environment_serial_number; }
private: