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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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9
components/layout_2020/flow/inline/inline_box.rs
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@ -6,6 +6,7 @@ use std::vec::IntoIter;
use app_units::Au;
use fonts::FontMetrics;
use malloc_size_of_derive::MallocSizeOf;
use super::{InlineContainerState, InlineContainerStateFlags, inline_container_needs_strut};
use crate::ContainingBlock;
@ -17,7 +18,7 @@ use crate::fragment_tree::BaseFragmentInfo;
use crate::layout_box_base::LayoutBoxBase;
use crate::style_ext::{LayoutStyle, PaddingBorderMargin};
#[derive(Debug)]
#[derive(Debug, MallocSizeOf)]
pub(crate) struct InlineBox {
pub base: LayoutBoxBase,
/// The identifier of this inline box in the containing [`super::InlineFormattingContext`].
@ -56,7 +57,7 @@ impl InlineBox {
}
}
#[derive(Debug, Default)]
#[derive(Debug, Default, MallocSizeOf)]
pub(crate) struct InlineBoxes {
/// A collection of all inline boxes in a particular [`super::InlineFormattingContext`].
inline_boxes: Vec<ArcRefCell<InlineBox>>,
@ -162,7 +163,7 @@ impl InlineBoxes {
}
}
#[derive(Clone, Copy, Debug, PartialEq)]
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq)]
pub(super) enum InlineBoxTreePathToken {
Start(InlineBoxIdentifier),
End(InlineBoxIdentifier),
@ -183,7 +184,7 @@ impl InlineBoxTreePathToken {
/// [`u32`] is used for the index, in order to save space. The value refers to the token
/// in the start tree data structure which can be fetched to find the actual index of
/// of the [`InlineBox`] in [`InlineBoxes::inline_boxes`].
#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
#[derive(Clone, Copy, Debug, Default, Eq, Hash, MallocSizeOf, PartialEq)]
pub(crate) struct InlineBoxIdentifier {
pub index_of_start_in_tree: u32,
pub index_in_inline_boxes: u32,