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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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@ -32,21 +32,22 @@
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namespace JS {
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SymbolConstructor::SymbolConstructor(GlobalObject& global_object)
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: NativeFunction("Symbol", *global_object.function_prototype())
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: NativeFunction(vm().names.Symbol, *global_object.function_prototype())
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{
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}
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void SymbolConstructor::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.symbol_prototype(), 0);
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define_property("length", Value(0), Attribute::Configurable);
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define_property(vm.names.prototype, global_object.symbol_prototype(), 0);
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define_property(vm.names.length, Value(0), Attribute::Configurable);
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define_native_function("for", for_, 1, Attribute::Writable | Attribute::Configurable);
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define_native_function("keyFor", key_for, 1, Attribute::Writable | Attribute::Configurable);
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define_native_function(vm.names.for_, for_, 1, Attribute::Writable | Attribute::Configurable);
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define_native_function(vm.names.keyFor, key_for, 1, Attribute::Writable | Attribute::Configurable);
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#define __JS_ENUMERATE(SymbolName, snake_name) \
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define_property(#SymbolName, global_object.vm().well_known_symbol_##snake_name(), 0);
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define_property(vm.names.SymbolName, vm.well_known_symbol_##snake_name(), 0);
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JS_ENUMERATE_WELL_KNOWN_SYMBOLS
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#undef __JS_ENUMERATE
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}
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