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layout: Report memory usage for fragment and box trees. (#36553)

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Add memory reporter integration for the fragment and box trees that are
persisted in the layout thread.

Testing: Looked at the numbers for https://servo.org and
https://html.spec.whatwg.org/. The former was very small, but the latter
was 700mb.

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
This commit is contained in:
Josh Matthews 2025-04-18 16:05:15 -04:00 • committed by GitHub
parent add8c51f47
commit c787688afc
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33 changed files with 230 additions and 69 deletions
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10
components/layout_2020/fragment_tree/base_fragment.rs
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@ -3,6 +3,8 @@
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use bitflags::bitflags;
use malloc_size_of::malloc_size_of_is_0;
use malloc_size_of_derive::MallocSizeOf;
use script_layout_interface::combine_id_with_fragment_type;
use style::dom::OpaqueNode;
use style::selector_parser::PseudoElement;
@ -10,7 +12,7 @@ use style::selector_parser::PseudoElement;
/// This data structure stores fields that are common to all non-base
/// Fragment types and should generally be the first member of all
/// concrete fragments.
#[derive(Clone, Debug)]
#[derive(Clone, Debug, MallocSizeOf)]
pub(crate) struct BaseFragment {
/// A tag which identifies the DOM node and pseudo element of this
/// Fragment's content. If this fragment is for an anonymous box,
@ -38,7 +40,7 @@ impl BaseFragment {
}
/// Information necessary to construct a new BaseFragment.
#[derive(Clone, Copy, Debug)]
#[derive(Clone, Copy, Debug, MallocSizeOf)]
pub(crate) struct BaseFragmentInfo {
/// The tag to use for the new BaseFragment, if it is not an anonymous Fragment.
pub tag: Option<Tag>,
@ -107,9 +109,11 @@ bitflags! {
}
}
malloc_size_of_is_0!(FragmentFlags);
/// A data structure used to hold DOM and pseudo-element information about
/// a particular layout object.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
#[derive(Clone, Copy, Debug, Eq, MallocSizeOf, PartialEq)]
pub(crate) struct Tag {
pub(crate) node: OpaqueNode,
pub(crate) pseudo: Option<PseudoElement>,