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LibJS: Shrink DeclarativeEnvironment bindings vector to fit

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After setting up all the bindings in function_declaration_instantiation,
we now ask DeclarativeEnvironment to do a shrink_to_fit() on its vector
of bindings.

This ends up saving 5.6 MiB on twitter.com/awesomekling :^)
This commit is contained in:
Andreas Kling 2022-11-26 20:33:52 +01:00 • committed by Linus Groh
parent d77ce7bae9
commit 2e98c17347
3 changed files with 12 additions and 0 deletions
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5
Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.cpp
View file

@ -231,4 +231,9 @@ void DeclarativeEnvironment::initialize_or_set_mutable_binding(Badge<ScopeNode>,
MUST(initialize_or_set_mutable_binding(vm, name, value));
}
void DeclarativeEnvironment::shrink_to_fit()
{
m_bindings.shrink_to_fit();
}
}

2
Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.h
View file

@ -57,6 +57,8 @@ public:
ThrowCompletionOr<void> set_mutable_binding_direct(VM&, size_t index, Value, bool strict);
ThrowCompletionOr<Value> get_binding_value_direct(VM&, size_t index, bool strict);
void shrink_to_fit();
private:
ThrowCompletionOr<void> initialize_binding_direct(VM&, Binding&, Value);
ThrowCompletionOr<Value> get_binding_value_direct(VM&, Binding&, bool strict);

5
Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
View file

@ -577,6 +577,11 @@ ThrowCompletionOr<void> ECMAScriptFunctionObject::function_declaration_instantia
MUST(var_environment->set_mutable_binding(vm, declaration.name(), function, false));
}
if (is<DeclarativeEnvironment>(*lex_environment))
static_cast<DeclarativeEnvironment*>(lex_environment)->shrink_to_fit();
if (is<DeclarativeEnvironment>(*var_environment))
static_cast<DeclarativeEnvironment*>(var_environment)->shrink_to_fit();
return {};
}