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@ -3,16 +3,12 @@
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//! The `JsObject` is a garbage collected Object.
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use super::{ |
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internal_methods::{ |
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non_existant_call, non_existant_construct, InternalMethodContext, InternalObjectMethods, |
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}, |
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internal_methods::{InternalMethodContext, InternalObjectMethods, ORDINARY_INTERNAL_METHODS}, |
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shape::RootShape, |
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JsPrototype, NativeObject, Object, PrivateName, PropertyMap, |
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}; |
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use crate::{ |
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builtins::{ |
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array::ARRAY_EXOTIC_INTERNAL_METHODS, function::OrdinaryFunction, object::OrdinaryObject, |
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}, |
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builtins::{array::ARRAY_EXOTIC_INTERNAL_METHODS, object::OrdinaryObject}, |
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context::intrinsics::Intrinsics, |
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error::JsNativeError, |
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js_string, |
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@ -45,9 +41,18 @@ pub type ErasedObject = Object<dyn NativeObject>;
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pub(crate) type ErasedVTableObject = VTableObject<dyn NativeObject>; |
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/// Garbage collected `Object`.
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#[derive(Trace, Finalize, Clone)] |
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pub struct JsObject { |
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inner: Gc<VTableObject<dyn NativeObject>>, |
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#[derive(Trace, Finalize)] |
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#[boa_gc(unsafe_no_drop)] |
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pub struct JsObject<T: NativeObject + ?Sized = dyn NativeObject> { |
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inner: Gc<VTableObject<T>>, |
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} |
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impl<T: NativeObject + ?Sized> Clone for JsObject<T> { |
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fn clone(&self) -> Self { |
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Self { |
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inner: self.inner.clone(), |
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} |
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} |
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} |
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/// An `Object` that has an additional `vtable` with its internal methods.
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@ -79,7 +84,9 @@ impl JsObject {
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vtable, |
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}); |
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Self { inner: upcast(gc) } |
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Self { |
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inner: coerce_gc(gc), |
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} |
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} |
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/// Creates a new ordinary object with its prototype set to the `Object` prototype.
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@ -131,7 +138,9 @@ impl JsObject {
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vtable: internal_methods, |
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}); |
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Self { inner: upcast(gc) } |
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Self { |
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inner: coerce_gc(gc), |
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} |
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} |
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/// Creates a new object with the provided prototype and object data.
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@ -160,70 +169,115 @@ impl JsObject {
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vtable: internal_methods, |
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}); |
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Self { inner: upcast(gc) } |
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Self { |
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inner: coerce_gc(gc), |
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} |
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} |
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/// Immutably borrows the `Object`.
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/// Downcasts the object's inner data if the object is of type `T`.
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///
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/// The borrow lasts until the returned `Ref` exits scope.
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/// Multiple immutable borrows can be taken out at the same time.
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/// # Panics
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///
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/// Panics if the object is currently mutably borrowed.
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pub fn downcast<T: NativeObject>(self) -> Result<JsObject<T>, Self> { |
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if self.borrow().is::<T>() { |
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let ptr: NonNull<GcBox<VTableObject<dyn NativeObject>>> = Gc::into_raw(self.inner); |
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// SAFETY: the rooted `Gc` ensures we can read the inner `GcBox` in a sound way.
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#[cfg(debug_assertions)] |
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unsafe { |
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let erased = ptr.as_ref(); |
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// Some sanity checks to ensure we're doing the correct cast.
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assert_eq!( |
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std::mem::size_of_val(erased), |
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std::mem::size_of::<GcBox<VTableObject<T>>>() |
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); |
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assert_eq!( |
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std::mem::align_of_val(erased), |
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std::mem::align_of::<GcBox<VTableObject<T>>>() |
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); |
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} |
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let ptr: NonNull<GcBox<VTableObject<T>>> = ptr.cast(); |
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// SAFETY: The conversion between an `Any` and its downcasted type must be valid.
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// The pointer returned by `Gc::into_raw` is the same one that is passed to `Gc::from_raw`,
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// just downcasted to the type `T`.
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let inner = unsafe { Gc::from_raw(ptr) }; |
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Ok(JsObject { inner }) |
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} else { |
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Err(self) |
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} |
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} |
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/// Downcasts a reference to the object,
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/// if the object is of type `T`.
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///
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/// # Panics
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///
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/// Panics if the object is currently mutably borrowed.
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#[inline] |
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#[must_use] |
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#[track_caller] |
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pub fn borrow(&self) -> Ref<'_, ErasedObject> { |
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self.try_borrow().expect("Object already mutably borrowed") |
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pub fn downcast_ref<T: NativeObject>(&self) -> Option<Ref<'_, T>> { |
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Ref::try_map(self.borrow(), ErasedObject::downcast_ref) |
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} |
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/// Mutably borrows the Object.
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///
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/// The borrow lasts until the returned `RefMut` exits scope.
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/// The object cannot be borrowed while this borrow is active.
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/// Downcasts a mutable reference to the object,
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/// if the object is type native object type `T`.
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///
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/// # Panics
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///
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/// Panics if the object is currently borrowed.
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#[inline] |
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#[must_use] |
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#[track_caller] |
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pub fn borrow_mut(&self) -> RefMut<'_, ErasedObject, ErasedObject> { |
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self.try_borrow_mut().expect("Object already borrowed") |
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pub fn downcast_mut<T: NativeObject>(&self) -> Option<RefMut<'_, ErasedObject, T>> { |
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RefMut::try_map(self.borrow_mut(), ErasedObject::downcast_mut) |
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} |
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/// Immutably borrows the `Object`, returning an error if the value is currently mutably borrowed.
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/// Checks if this object is an instance of a certain `NativeObject`.
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///
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/// The borrow lasts until the returned `GcCellRef` exits scope.
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/// Multiple immutable borrows can be taken out at the same time.
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/// # Panics
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///
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/// This is the non-panicking variant of [`borrow`](#method.borrow).
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/// Panics if the object is currently mutably borrowed.
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#[inline] |
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pub fn try_borrow(&self) -> StdResult<Ref<'_, ErasedObject>, BorrowError> { |
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self.inner.object.try_borrow().map_err(|_| BorrowError) |
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#[must_use] |
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#[track_caller] |
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pub fn is<T: NativeObject>(&self) -> bool { |
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self.borrow().is::<T>() |
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} |
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/// Mutably borrows the object, returning an error if the value is currently borrowed.
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/// Checks if it's an ordinary object.
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///
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/// The borrow lasts until the returned `GcCellRefMut` exits scope.
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/// The object be borrowed while this borrow is active.
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/// # Panics
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///
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/// This is the non-panicking variant of [`borrow_mut`](#method.borrow_mut).
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/// Panics if the object is currently mutably borrowed.
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#[inline] |
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pub fn try_borrow_mut( |
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&self, |
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) -> StdResult<RefMut<'_, ErasedObject, ErasedObject>, BorrowMutError> { |
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self.inner |
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.object |
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.try_borrow_mut() |
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.map_err(|_| BorrowMutError) |
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#[must_use] |
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#[track_caller] |
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pub fn is_ordinary(&self) -> bool { |
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self.is::<OrdinaryObject>() |
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} |
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/// Checks if the garbage collected memory is the same.
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/// Checks if it's an `Array` object.
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#[inline] |
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#[must_use] |
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#[track_caller] |
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pub fn is_array(&self) -> bool { |
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std::ptr::eq(self.vtable(), &ARRAY_EXOTIC_INTERNAL_METHODS) |
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} |
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/// Checks if it's an `ArrayBuffer` or `SharedArrayBuffer` object.
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///
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/// # Panics
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///
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/// Panics if the object is currently mutably borrowed.
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#[inline] |
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pub fn equals(lhs: &Self, rhs: &Self) -> bool { |
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std::ptr::eq(lhs.as_ref(), rhs.as_ref()) |
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#[must_use] |
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#[track_caller] |
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pub fn is_buffer(&self) -> bool { |
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self.borrow().as_buffer().is_some() |
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} |
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/// Converts an object to a primitive.
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@ -301,107 +355,6 @@ impl JsObject {
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.into()) |
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} |
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/// Downcast a reference to the object,
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/// if the object is of type `T`.
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///
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/// # Panics
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///
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/// Panics if the object is currently mutably borrowed.
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#[must_use] |
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#[track_caller] |
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pub fn downcast_ref<T: NativeObject>(&self) -> Option<Ref<'_, T>> { |
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Ref::try_map(self.borrow(), ErasedObject::downcast_ref) |
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} |
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/// Downcast a mutable reference to the object,
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/// if the object is type native object type `T`.
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///
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/// # Panics
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///
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/// Panics if the object is currently borrowed.
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#[must_use] |
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#[track_caller] |
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pub fn downcast_mut<T: NativeObject>(&self) -> Option<RefMut<'_, ErasedObject, T>> { |
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RefMut::try_map(self.borrow_mut(), ErasedObject::downcast_mut) |
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} |
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/// Get the prototype of the object.
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///
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/// # Panics
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///
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/// Panics if the object is currently mutably borrowed.
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#[inline] |
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#[must_use] |
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#[track_caller] |
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pub fn prototype(&self) -> JsPrototype { |
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self.borrow().prototype() |
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} |
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/// Get the extensibility of the object.
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///
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/// # Panics
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///
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/// Panics if the object is currently mutably borrowed.
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pub(crate) fn extensible(&self) -> bool { |
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self.borrow().extensible |
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} |
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/// Set the prototype of the object.
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///
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/// # Panics
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///
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/// Panics if the object is currently mutably borrowed
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#[inline] |
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#[track_caller] |
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#[allow(clippy::must_use_candidate)] |
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pub fn set_prototype(&self, prototype: JsPrototype) -> bool { |
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self.borrow_mut().set_prototype(prototype) |
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} |
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/// Checks if this object is an instance of a certain `NativeObject`.
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///
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/// # Panics
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///
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/// Panics if the object is currently mutably borrowed.
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#[inline] |
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#[must_use] |
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#[track_caller] |
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pub fn is<T: NativeObject>(&self) -> bool { |
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self.borrow().is::<T>() |
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} |
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/// Checks if it's an ordinary object.
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///
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/// # Panics
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///
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/// Panics if the object is currently mutably borrowed.
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#[inline] |
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#[must_use] |
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#[track_caller] |
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pub fn is_ordinary(&self) -> bool { |
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self.is::<OrdinaryObject>() |
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} |
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/// Checks if it's an `Array` object.
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#[inline] |
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#[must_use] |
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#[track_caller] |
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pub fn is_array(&self) -> bool { |
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std::ptr::eq(self.vtable(), &ARRAY_EXOTIC_INTERNAL_METHODS) |
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} |
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/// Checks if it's an `ArrayBuffer` or `SharedArrayBuffer` object.
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///
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/// # Panics
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///
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/// Panics if the object is currently mutably borrowed.
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#[inline] |
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#[must_use] |
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#[track_caller] |
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pub fn is_buffer(&self) -> bool { |
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self.borrow().as_buffer().is_some() |
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} |
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/// The abstract operation `ToPropertyDescriptor`.
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///
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/// More information:
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|
|
@ -582,6 +535,139 @@ Cannot both specify accessors and a value or writable attribute",
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} |
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|
None |
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} |
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|
} |
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|
|
|
|
|
impl<T: NativeObject + ?Sized> JsObject<T> { |
|
|
|
|
/// Creates a new `JsObject` from its root shape, prototype, and data.
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|
|
|
|
///
|
|
|
|
|
/// Note that the returned object will not be erased to be convertible to a
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|
|
/// `JsValue`. To erase the pointer, call [`JsObject::upcast`].
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|
|
pub fn new<O: Into<Option<JsObject>>>(root_shape: &RootShape, prototype: O, data: T) -> Self |
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|
|
where |
|
|
|
|
T: Sized, |
|
|
|
|
{ |
|
|
|
|
let internal_methods = data.internal_methods(); |
|
|
|
|
let inner = Gc::new(VTableObject { |
|
|
|
|
object: GcRefCell::new(Object { |
|
|
|
|
data, |
|
|
|
|
properties: PropertyMap::from_prototype_with_shared_shape( |
|
|
|
|
root_shape, |
|
|
|
|
prototype.into(), |
|
|
|
|
), |
|
|
|
|
extensible: true, |
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|
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private_elements: ThinVec::new(), |
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}), |
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vtable: internal_methods, |
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}); |
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Self { inner } |
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} |
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/// Upcasts this object's inner data from a specific type `T` to an erased type
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/// `dyn NativeObject`.
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#[must_use] |
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pub fn upcast(self) -> JsObject |
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where |
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T: Sized, |
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{ |
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JsObject { |
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inner: coerce_gc(self.inner), |
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} |
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} |
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/// Immutably borrows the `Object`.
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///
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/// The borrow lasts until the returned `Ref` exits scope.
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/// Multiple immutable borrows can be taken out at the same time.
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///
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/// # Panics
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///
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/// Panics if the object is currently mutably borrowed.
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#[inline] |
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#[must_use] |
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#[track_caller] |
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pub fn borrow(&self) -> Ref<'_, Object<T>> { |
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self.try_borrow().expect("Object already mutably borrowed") |
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} |
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/// Mutably borrows the Object.
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///
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/// The borrow lasts until the returned `RefMut` exits scope.
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/// The object cannot be borrowed while this borrow is active.
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///
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/// # Panics
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/// Panics if the object is currently borrowed.
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#[inline] |
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#[must_use] |
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#[track_caller] |
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pub fn borrow_mut(&self) -> RefMut<'_, Object<T>, Object<T>> { |
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self.try_borrow_mut().expect("Object already borrowed") |
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} |
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/// Immutably borrows the `Object`, returning an error if the value is currently mutably borrowed.
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///
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/// The borrow lasts until the returned `GcCellRef` exits scope.
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/// Multiple immutable borrows can be taken out at the same time.
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///
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/// This is the non-panicking variant of [`borrow`](#method.borrow).
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#[inline] |
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|
pub fn try_borrow(&self) -> StdResult<Ref<'_, Object<T>>, BorrowError> { |
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self.inner.object.try_borrow().map_err(|_| BorrowError) |
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} |
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/// Mutably borrows the object, returning an error if the value is currently borrowed.
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///
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/// The borrow lasts until the returned `GcCellRefMut` exits scope.
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/// The object be borrowed while this borrow is active.
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|
///
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/// This is the non-panicking variant of [`borrow_mut`](#method.borrow_mut).
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#[inline] |
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|
pub fn try_borrow_mut(&self) -> StdResult<RefMut<'_, Object<T>, Object<T>>, BorrowMutError> { |
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|
|
self.inner |
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|
.object |
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|
.try_borrow_mut() |
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|
.map_err(|_| BorrowMutError) |
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|
} |
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/// Checks if the garbage collected memory is the same.
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|
|
#[must_use] |
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|
#[inline] |
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|
pub fn equals(lhs: &Self, rhs: &Self) -> bool { |
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|
Gc::ptr_eq(lhs.inner(), rhs.inner()) |
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|
} |
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|
/// Get the prototype of the object.
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|
///
|
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|
/// # Panics
|
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|
///
|
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|
/// Panics if the object is currently mutably borrowed.
|
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|
|
#[inline] |
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|
|
#[must_use] |
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|
#[track_caller] |
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|
|
pub fn prototype(&self) -> JsPrototype { |
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|
|
self.borrow().prototype() |
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|
} |
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|
/// Get the extensibility of the object.
|
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|
|
///
|
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|
|
/// # Panics
|
|
|
|
|
///
|
|
|
|
|
/// Panics if the object is currently mutably borrowed.
|
|
|
|
|
pub(crate) fn extensible(&self) -> bool { |
|
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|
|
self.borrow().extensible |
|
|
|
|
} |
|
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|
|
/// Set the prototype of the object.
|
|
|
|
|
///
|
|
|
|
|
/// # Panics
|
|
|
|
|
///
|
|
|
|
|
/// Panics if the object is currently mutably borrowed
|
|
|
|
|
#[inline] |
|
|
|
|
#[track_caller] |
|
|
|
|
#[allow(clippy::must_use_candidate)] |
|
|
|
|
pub fn set_prototype(&self, prototype: JsPrototype) -> bool { |
|
|
|
|
self.borrow_mut().set_prototype(prototype) |
|
|
|
|
} |
|
|
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|
|
|
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|
|
/// Helper function for property insertion.
|
|
|
|
|
#[track_caller] |
|
|
|
|
@ -613,9 +699,8 @@ Cannot both specify accessors and a value or writable attribute",
|
|
|
|
|
/// [spec]: https://tc39.es/ecma262/#sec-iscallable
|
|
|
|
|
#[inline] |
|
|
|
|
#[must_use] |
|
|
|
|
#[allow(clippy::fn_address_comparisons)] |
|
|
|
|
pub fn is_callable(&self) -> bool { |
|
|
|
|
self.inner.vtable.__call__ != non_existant_call |
|
|
|
|
self.inner.vtable.__call__ != ORDINARY_INTERNAL_METHODS.__call__ |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
/// It determines if Object is a function object with a `[[Construct]]` internal method.
|
|
|
|
|
@ -626,16 +711,15 @@ Cannot both specify accessors and a value or writable attribute",
|
|
|
|
|
/// [spec]: https://tc39.es/ecma262/#sec-isconstructor
|
|
|
|
|
#[inline] |
|
|
|
|
#[must_use] |
|
|
|
|
#[allow(clippy::fn_address_comparisons)] |
|
|
|
|
pub fn is_constructor(&self) -> bool { |
|
|
|
|
self.inner.vtable.__construct__ != non_existant_construct |
|
|
|
|
self.inner.vtable.__construct__ != ORDINARY_INTERNAL_METHODS.__construct__ |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
pub(crate) fn vtable(&self) -> &'static InternalObjectMethods { |
|
|
|
|
self.inner.vtable |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
pub(crate) const fn inner(&self) -> &Gc<VTableObject<dyn NativeObject>> { |
|
|
|
|
pub(crate) const fn inner(&self) -> &Gc<VTableObject<T>> { |
|
|
|
|
&self.inner |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
@ -646,29 +730,29 @@ Cannot both specify accessors and a value or writable attribute",
|
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
impl AsRef<GcRefCell<ErasedObject>> for JsObject { |
|
|
|
|
impl<T: NativeObject + ?Sized> AsRef<GcRefCell<Object<T>>> for JsObject<T> { |
|
|
|
|
#[inline] |
|
|
|
|
fn as_ref(&self) -> &GcRefCell<ErasedObject> { |
|
|
|
|
fn as_ref(&self) -> &GcRefCell<Object<T>> { |
|
|
|
|
&self.inner.object |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
impl From<Gc<VTableObject<dyn NativeObject>>> for JsObject { |
|
|
|
|
impl<T: NativeObject + ?Sized> From<Gc<VTableObject<T>>> for JsObject<T> { |
|
|
|
|
#[inline] |
|
|
|
|
fn from(inner: Gc<VTableObject<dyn NativeObject>>) -> Self { |
|
|
|
|
fn from(inner: Gc<VTableObject<T>>) -> Self { |
|
|
|
|
Self { inner } |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
impl PartialEq for JsObject { |
|
|
|
|
impl<T: NativeObject + ?Sized> PartialEq for JsObject<T> { |
|
|
|
|
fn eq(&self, other: &Self) -> bool { |
|
|
|
|
Self::equals(self, other) |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
impl Eq for JsObject {} |
|
|
|
|
impl<T: NativeObject + ?Sized> Eq for JsObject<T> {} |
|
|
|
|
|
|
|
|
|
impl Hash for JsObject { |
|
|
|
|
impl<T: NativeObject + ?Sized> Hash for JsObject<T> { |
|
|
|
|
fn hash<H: std::hash::Hasher>(&self, state: &mut H) { |
|
|
|
|
std::ptr::hash(self.as_ref(), state); |
|
|
|
|
} |
|
|
|
|
@ -782,7 +866,7 @@ impl RecursionLimiter {
|
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
impl Debug for JsObject { |
|
|
|
|
impl<T: NativeObject + ?Sized> Debug for JsObject<T> { |
|
|
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> std::fmt::Result { |
|
|
|
|
let limiter = RecursionLimiter::new(self.as_ref()); |
|
|
|
|
|
|
|
|
|
@ -797,7 +881,7 @@ impl Debug for JsObject {
|
|
|
|
|
let ptr = ptr.cast::<()>(); |
|
|
|
|
let obj = self.borrow(); |
|
|
|
|
let kind = obj.data.type_name_of_value(); |
|
|
|
|
if obj.is::<OrdinaryFunction>() { |
|
|
|
|
if self.is_callable() { |
|
|
|
|
let name_prop = obj |
|
|
|
|
.properties() |
|
|
|
|
.get(&PropertyKey::String(JsString::from("name"))); |
|
|
|
|
@ -821,7 +905,7 @@ impl Debug for JsObject {
|
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
/// Upcasts the reference to an object from a specific type `T` to an erased type `dyn NativeObject`.
|
|
|
|
|
fn upcast<T: NativeObject>(ptr: Gc<VTableObject<T>>) -> Gc<VTableObject<dyn NativeObject>> { |
|
|
|
|
fn coerce_gc<T: NativeObject>(ptr: Gc<VTableObject<T>>) -> Gc<VTableObject<dyn NativeObject>> { |
|
|
|
|
// SAFETY: This just makes the casting from sized to unsized. Should eventually be replaced by
|
|
|
|
|
// https://github.com/rust-lang/rust/issues/18598
|
|
|
|
|
unsafe { |
|
|
|
|
|
José Julián Espina
10 months ago
committed by
GitHub