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LibJS: Add Object::get_without_side_effects()

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Similar to Value::to_string_without_side_effects() this is mostly a
regular object property lookup, but with the guarantee that it will be
side-effect free, i.e. no accessors or native property functions will
be called. This is needed when we want to access user-controlled object
properties for debug logging, for example. The specific use case will be
error objects which will soon no longer have internal name/message
properties, so we need to guarantee that printing an error, which may
already be the result of an exception, won't blow up in our face :^)
This commit is contained in:
Linus Groh 2021-04-11 22:52:25 +02:00 • committed by Andreas Kling
parent 9ec4defdd2
commit 6e9eb0a284
4 changed files with 23 additions and 11 deletions
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6
Userland/Libraries/LibJS/Runtime/ProxyObject.cpp
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@ -325,9 +325,13 @@ bool ProxyObject::has_property(const PropertyName& name) const
return trap_result.to_boolean();
}
Value ProxyObject::get(const PropertyName& name, Value receiver) const
Value ProxyObject::get(const PropertyName& name, Value receiver, bool without_side_effects) const
{
auto& vm = this->vm();
if (without_side_effects) {
// Sorry, we're not going to call anything on this proxy.
return js_string(vm, "<ProxyObject>");
}
if (m_is_revoked) {
vm.throw_exception<TypeError>(global_object(), ErrorType::ProxyRevoked);
return {};