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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use js::jsapi::{Heap, JSObject};
use js::rust::HandleObject;
use malloc_size_of_derive::MallocSizeOf;
/// A struct to store a reference to the reflector of a DOM object.
#[cfg_attr(crown, allow(crown::unrooted_must_root))]
#[derive(MallocSizeOf)]
#[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]
// If you're renaming or moving this field, update the path in plugins::reflector as well
pub struct Reflector {
#[ignore_malloc_size_of = "defined and measured in rust-mozjs"]
object: Heap<*mut JSObject>,
}
unsafe impl js::gc::Traceable for Reflector {
unsafe fn trace(&self, _: *mut js::jsapi::JSTracer) {}
}
#[cfg_attr(crown, allow(crown::unrooted_must_root))]
impl PartialEq for Reflector {
fn eq(&self, other: &Reflector) -> bool {
self.object.get() == other.object.get()
}
}
impl Reflector {
/// Get the reflector.
#[inline]
pub fn get_jsobject(&self) -> HandleObject {
// We're rooted, so it's safe to hand out a handle to object in Heap
unsafe { HandleObject::from_raw(self.object.handle()) }
}
/// Initialize the reflector. (May be called only once.)
///
/// # Safety
///
/// The provided [`JSObject`] pointer must point to a valid [`JSObject`].
pub unsafe fn set_jsobject(&self, object: *mut JSObject) {
assert!(self.object.get().is_null());
assert!(!object.is_null());
self.object.set(object);
}
/// Return a pointer to the memory location at which the JS reflector
/// object is stored. Used to root the reflector, as
/// required by the JSAPI rooting APIs.
pub fn rootable(&self) -> &Heap<*mut JSObject> {
&self.object
}
/// Create an uninitialized `Reflector`.
// These are used by the bindings and do not need `default()` functions.
#[allow(clippy::new_without_default)]
pub fn new() -> Reflector {
Reflector {
object: Heap::default(),
}
}
}
/// A trait to provide access to the `Reflector` for a DOM object.
pub trait DomObject: js::gc::Traceable + 'static {
/// Returns the receiver's reflector.
fn reflector(&self) -> &Reflector;
}
impl DomObject for Reflector {
fn reflector(&self) -> &Self {
self
}
}
/// A trait to initialize the `Reflector` for a DOM object.
pub trait MutDomObject: DomObject {
/// Initializes the Reflector
///
/// # Safety
///
/// The provided [`JSObject`] pointer must point to a valid [`JSObject`].
unsafe fn init_reflector(&self, obj: *mut JSObject);
}
impl MutDomObject for Reflector {
unsafe fn init_reflector(&self, obj: *mut JSObject) {
self.set_jsobject(obj)
}
}
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