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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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5
Userland/Libraries/LibJS/Runtime/Object.h
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@ -94,14 +94,15 @@ public:
GlobalObject& global_object() const { return *shape().global_object(); }
virtual Value get(const PropertyName&, Value receiver = {}) const;
virtual Value get(const PropertyName&, Value receiver = {}, bool without_side_effects = false) const;
Value get_without_side_effects(const PropertyName&) const;
virtual bool has_property(const PropertyName&) const;
bool has_own_property(const PropertyName&) const;
virtual bool put(const PropertyName&, Value, Value receiver = {});
Value get_own_property(const PropertyName&, Value receiver) const;
Value get_own_property(const PropertyName&, Value receiver, bool without_side_effects = false) const;
MarkedValueList get_own_properties(PropertyKind, bool only_enumerable_properties = false, GetOwnPropertyReturnType = GetOwnPropertyReturnType::All) const;
MarkedValueList get_enumerable_own_property_names(PropertyKind) const;
virtual Optional<PropertyDescriptor> get_own_property_descriptor(const PropertyName&) const;