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LibJS: Don't reserve space in function environment for parameter locals

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3% speed-up on Octane/typescript.js (but basically improves performance
on most JS.)
This commit is contained in:
Andreas Kling 2024-01-21 16:30:25 +01:00
parent bed78eb3cc
commit 1a07205c33
Notes: sideshowbarker 2024-07-17 06:40:35 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/1a07205c33
Pull-request: https://github.com/SerenityOS/serenity/pull/22889
Reviewed-by: https://github.com/trflynn89
1 changed files with 7 additions and 1 deletions
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8
Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
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@ -118,6 +118,8 @@ ECMAScriptFunctionObject::ECMAScriptFunctionObject(DeprecatedFlyString name, Byt
// 5. Let parameterNames be the BoundNames of formals.
// 6. If parameterNames has any duplicate entries, let hasDuplicates be true. Otherwise, let hasDuplicates be false.
size_t parameters_in_environment = 0;
// NOTE: This loop performs step 5, 6, and 8.
for (auto const& parameter : formals) {
if (parameter.default_value)
@ -127,6 +129,8 @@ ECMAScriptFunctionObject::ECMAScriptFunctionObject(DeprecatedFlyString name, Byt
[&](Identifier const& identifier) {
if (m_parameter_names.set(identifier.string(), identifier.is_local() ? ParameterIsLocal::Yes : ParameterIsLocal::No) != AK::HashSetResult::InsertedNewEntry)
m_has_duplicates = true;
else if (!identifier.is_local())
++parameters_in_environment;
},
[&](NonnullRefPtr<BindingPattern const> const& pattern) {
if (pattern->contains_expression())
@ -136,6 +140,8 @@ ECMAScriptFunctionObject::ECMAScriptFunctionObject(DeprecatedFlyString name, Byt
MUST(pattern->for_each_bound_identifier([&](auto& identifier) {
if (m_parameter_names.set(identifier.string(), identifier.is_local() ? ParameterIsLocal::Yes : ParameterIsLocal::No) != AK::HashSetResult::InsertedNewEntry)
m_has_duplicates = true;
else if (!identifier.is_local())
++parameters_in_environment;
}));
});
}
@ -202,7 +208,7 @@ ECMAScriptFunctionObject::ECMAScriptFunctionObject(DeprecatedFlyString name, Byt
environment_size = &parameter_environment_bindings_count;
}
*environment_size += m_parameter_names.size();
*environment_size += parameters_in_environment;
HashMap<DeprecatedFlyString, ParameterIsLocal> parameter_bindings;