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LibJS: Add Proxy objects

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Includes all traps except the following: [[Call]], [[Construct]],
[[OwnPropertyKeys]].

An important implication of this commit is that any call to any virtual
Object method has the potential to throw an exception. These methods
were not checked in this commit -- a future commit will have to protect
these various method calls throughout the codebase.
This commit is contained in:
Matthew Olsson 2020-06-03 14:34:52 -07:00 • committed by Andreas Kling
parent 58a72e9b81
commit 39ad42defd
29 changed files with 1697 additions and 54 deletions
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31
Libraries/LibJS/Runtime/Object.h
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@ -42,10 +42,10 @@ namespace JS {
struct PropertyDescriptor {
PropertyAttributes attributes;
Value value;
Function* getter;
Function* setter;
Function* getter { nullptr };
Function* setter { nullptr };
static PropertyDescriptor from_object(Interpreter&, const Object&);
static PropertyDescriptor from_dictionary(Interpreter&, const Object&);
bool is_accessor_descriptor() const { return getter || setter; }
bool is_data_descriptor() const { return !(value.is_empty() && !attributes.has_writable()); }
@ -73,25 +73,25 @@ public:
Shape& shape() { return *m_shape; }
const Shape& shape() const { return *m_shape; }
Value get(PropertyName) const;
virtual Value get(PropertyName) const;
bool has_property(PropertyName) const;
virtual bool has_property(PropertyName) const;
bool has_own_property(PropertyName) const;
bool put(PropertyName, Value);
virtual bool put(PropertyName, Value);
Value get_own_property(const Object& this_object, PropertyName) const;
Value get_own_properties(const Object& this_object, GetOwnPropertyMode, PropertyAttributes attributes = default_attributes) const;
Optional<PropertyDescriptor> get_own_property_descriptor(PropertyName) const;
Value get_own_properties(const Object& this_object, GetOwnPropertyMode, bool only_enumerable_properties = false) const;
virtual Optional<PropertyDescriptor> get_own_property_descriptor(PropertyName) const;
Value get_own_property_descriptor_object(PropertyName) const;
bool define_property(const FlyString& property_name, const Object& descriptor, bool throw_exceptions = true);
virtual bool define_property(const FlyString& property_name, const Object& descriptor, bool throw_exceptions = true);
bool define_property(PropertyName, Value value, PropertyAttributes attributes = default_attributes, bool throw_exceptions = true);
bool define_native_function(const FlyString& property_name, AK::Function<Value(Interpreter&)>, i32 length = 0, PropertyAttributes attributes = default_attributes);
bool define_native_property(const FlyString& property_name, AK::Function<Value(Interpreter&)> getter, AK::Function<void(Interpreter&, Value)> setter, PropertyAttributes attributes = default_attributes);
Value delete_property(PropertyName);
virtual Value delete_property(PropertyName);
virtual bool is_array() const { return false; }
virtual bool is_boolean() const { return false; }
@ -101,19 +101,20 @@ public:
virtual bool is_native_function() const { return false; }
virtual bool is_bound_function() const { return false; }
virtual bool is_native_property() const { return false; }
virtual bool is_proxy_object() const { return false; }
virtual bool is_string_object() const { return false; }
virtual bool is_symbol_object() const { return false; }
virtual const char* class_name() const override { return "Object"; }
virtual void visit_children(Cell::Visitor&) override;
Object* prototype();
const Object* prototype() const;
bool set_prototype(Object* prototype);
virtual Object* prototype();
virtual const Object* prototype() const;
virtual bool set_prototype(Object* prototype);
bool has_prototype(const Object* prototype) const;
bool is_extensible() const { return m_is_extensible; }
bool prevent_extensions();
virtual bool is_extensible() const { return m_is_extensible; }
virtual bool prevent_extensions();
virtual Value value_of() const { return Value(const_cast<Object*>(this)); }
virtual Value to_primitive(Value::PreferredType preferred_type = Value::PreferredType::Default) const;