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Measure the promoted paint list's retained heap

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This commit is contained in:
Dennis Kobert
2026-09-02 08:26:26 +00:00
parent c73976f407
commit aa50c42930
1 changed files with 11 additions and 3 deletions
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14
node-graph/libraries/graphic-types/src/graphic.rs
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@@ -1278,6 +1278,12 @@ pub(crate) fn list_contains_groups(list: &List<Graphic>) -> bool {
(0..list.len()).any(|index| list.element(index).is_some_and(graphic_contains_groups))
}
/// The heap a graphic list's elements own, group interiors excluded as
/// [`graphic_retained_heap`] excludes them.
fn list_retained_heap(list: &List<Graphic>) -> usize {
(0..list.len()).filter_map(|index| list.element(index)).map(graphic_retained_heap).sum()
}
/// The deep copy-out for graphic-list field values (the paint markers' owned
/// form): content groups leave in their owned form. Declines (`None`) for
/// group-free content, which already owns everything.
@@ -1329,10 +1335,12 @@ unsafe fn promote_graphic_list(src: *const u8, dst: *mut u8, promotion: &core_ty
unsafe { dst.cast::<Option<&List<Graphic<'static>>>>().write(None) };
return Some(());
};
let retained = list_retained_heap(list);
if !list_contains_groups(list) {
// SAFETY: a group-free list owns all of its content, and the arena
// declines a reference that is not a park of its own.
if let Some(moved) = unsafe { promotion.move_park::<List<Graphic<'static>>>(std::ptr::from_ref(list).cast(), 0) } {
// declines a reference that is not a park at the list's own address
// and size.
if let Some(moved) = unsafe { promotion.move_park::<List<Graphic<'static>>>(std::ptr::from_ref(list).cast(), retained) } {
// SAFETY: the move published a live list in the persistent region.
unsafe { dst.cast::<Option<&List<Graphic<'static>>>>().write(Some(&*moved)) };
return Some(());
@@ -1345,7 +1353,7 @@ unsafe fn promote_graphic_list(src: *const u8, dst: *mut u8, promotion: &core_ty
// SAFETY: every borrow the clone carried was replaced by persistent content
// above, so the erased form outlives the evaluation.
let promoted = unsafe { core_types::record::erase_static(promoted) };
let (parked, _) = promotion.persistent().alloc(promoted)?;
let (parked, _) = promotion.persistent().alloc_sized(promoted, retained)?;
// SAFETY: the slot holds one optional reference.
unsafe { dst.cast::<Option<&List<Graphic<'static>>>>().write(Some(parked)) };
Some(())