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Miscellaneous script splitting preparation changes (#36216)
* script: Move num module to script_bindings. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * script: Make JS reflector creation generic over DOM trait. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * script: Move bindings-specific lock to script_bindings. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * script: Move DOM proto array code to script_bindings. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * script: Move finalizer implementations to script_bindings. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * script: Move some error routines to script_bindings. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * script: Move some DOM interface conversion routines to script_bindings. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * script: Make is_array_like generic over DOM trait. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * script: Use generic interfaces for conditional exposure functions. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * script: Move a bunch of routines used by codegen to script_bindings. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * Formatting. Signed-off-by: Josh Matthews <josh@joshmatthews.net> * Fix clippy warnings. Signed-off-by: Josh Matthews <josh@joshmatthews.net> --------- Signed-off-by: Josh Matthews <josh@joshmatthews.net>
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28 changed files with 836 additions and 691 deletions
74
components/script_bindings/finalize.rs
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74
components/script_bindings/finalize.rs
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! Generic finalizer implementations for DOM binding implementations.
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use std::any::type_name;
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use std::{mem, ptr};
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use js::glue::JS_GetReservedSlot;
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use js::jsapi::JSObject;
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use js::jsval::UndefinedValue;
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use js::rust::GCMethods;
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use crate::codegen::PrototypeList::PROTO_OR_IFACE_LENGTH;
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use crate::utils::{ProtoOrIfaceArray, get_proto_or_iface_array};
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use crate::weakref::{DOM_WEAK_SLOT, WeakBox, WeakReferenceable};
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/// Drop the resources held by reserved slots of a global object
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unsafe fn do_finalize_global(obj: *mut JSObject) {
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let protolist = get_proto_or_iface_array(obj);
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let list = (*protolist).as_mut_ptr();
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for idx in 0..PROTO_OR_IFACE_LENGTH as isize {
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let entry = list.offset(idx);
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let value = *entry;
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<*mut JSObject>::post_barrier(entry, value, ptr::null_mut());
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}
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let _: Box<ProtoOrIfaceArray> = Box::from_raw(protolist);
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}
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/// # Safety
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/// `this` must point to a valid, non-null instance of T.
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pub unsafe fn finalize_common<T>(this: *const T) {
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if !this.is_null() {
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// The pointer can be null if the object is the unforgeable holder of that interface.
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let _ = Box::from_raw(this as *mut T);
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}
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debug!("{} finalize: {:p}", type_name::<T>(), this);
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}
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/// # Safety
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/// `obj` must point to a valid, non-null JS object.
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/// `this` must point to a valid, non-null instance of T.
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pub unsafe fn finalize_global<T>(obj: *mut JSObject, this: *const T) {
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do_finalize_global(obj);
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finalize_common::<T>(this);
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}
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/// # Safety
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/// `obj` must point to a valid, non-null JS object.
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/// `this` must point to a valid, non-null instance of T.
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pub unsafe fn finalize_weak_referenceable<T: WeakReferenceable>(
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obj: *mut JSObject,
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this: *const T,
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) {
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let mut slot = UndefinedValue();
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JS_GetReservedSlot(obj, DOM_WEAK_SLOT, &mut slot);
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let weak_box_ptr = slot.to_private() as *mut WeakBox<T>;
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if !weak_box_ptr.is_null() {
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let count = {
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let weak_box = &*weak_box_ptr;
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assert!(weak_box.value.get().is_some());
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assert!(weak_box.count.get() > 0);
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weak_box.value.set(None);
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let count = weak_box.count.get() - 1;
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weak_box.count.set(count);
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count
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};
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if count == 0 {
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mem::drop(Box::from_raw(weak_box_ptr));
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}
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}
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finalize_common::<T>(this);
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}
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