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LibJS: Cache commonly used FlyStrings in the VM

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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.
This commit is contained in:
Andreas Kling 2020-10-13 23:49:19 +02:00
parent 9f6c5f68b6
commit 7b863330dc
45 changed files with 651 additions and 392 deletions
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4
Libraries/LibJS/Runtime/VM.cpp
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@ -207,7 +207,7 @@ Value VM::construct(Function& function, Function& new_target, Optional<MarkedVal
current_environment()->bind_this_value(global_object, new_object);
if (exception())
return {};
auto prototype = new_target.get("prototype");
auto prototype = new_target.get(names.prototype);
if (exception())
return {};
if (prototype.is_object()) {
@ -230,7 +230,7 @@ Value VM::construct(Function& function, Function& new_target, Optional<MarkedVal
// set the prototype on objects created by constructors that return an object (i.e. NativeFunction subclasses).
if (function.constructor_kind() == Function::ConstructorKind::Base && new_target.constructor_kind() == Function::ConstructorKind::Derived && result.is_object()) {
current_environment()->replace_this_binding(result);
auto prototype = new_target.get("prototype");
auto prototype = new_target.get(names.prototype);
if (exception())
return {};
if (prototype.is_object()) {