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LibJS: Cache commonly used FlyStrings in the VM
Roughly 7% of test-js runtime was spent creating FlyStrings from string literals. This patch frontloads that work and caches all the commonly used names in LibJS on a CommonPropertyNames struct that hangs off VM.
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45 changed files with 651 additions and 392 deletions
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@ -35,19 +35,20 @@
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namespace JS {
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StringConstructor::StringConstructor(GlobalObject& global_object)
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: NativeFunction("String", *global_object.function_prototype())
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: NativeFunction(vm().names.String, *global_object.function_prototype())
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{
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}
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void StringConstructor::initialize(GlobalObject& global_object)
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{
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auto& vm = this->vm();
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NativeFunction::initialize(global_object);
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define_property("prototype", global_object.string_prototype(), 0);
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define_property("length", Value(1), Attribute::Configurable);
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define_property(vm.names.prototype, global_object.string_prototype(), 0);
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define_property(vm.names.length, Value(1), Attribute::Configurable);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function("raw", raw, 1, attr);
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define_native_function("fromCharCode", from_char_code, 1, attr);
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define_native_function(vm.names.raw, raw, 1, attr);
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define_native_function(vm.names.fromCharCode, from_char_code, 1, attr);
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}
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StringConstructor::~StringConstructor()
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@ -84,7 +85,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringConstructor::raw)
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if (vm.exception())
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return {};
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auto raw = template_object->get("raw");
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auto raw = template_object->get(vm.names.raw);
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if (vm.exception())
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return {};
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if (raw.is_empty() || raw.is_nullish()) {
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