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Make FlowRef a newtype

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This creates a sharp distinction between `Arc<Flow>`s, which may be
owned by anyone, and `FlowRef`s, which may only be owned by the
traversal code. By checking the reference count, we ensure that a `Flow`
cannot be pointed to by `Arc`s and `FlowRef`s simultaneously.

This is not a complete fix for #6503, though it is a necessary start
(enforcing the no-aliasing rule of `FlowRef::deref_mut` will require far
more work).

Fixes #14014
This commit is contained in:
Michael Howell 2016-11-03 12:53:27 -07:00
parent 5b4cc9568d
commit 5f320bd2ca
10 changed files with 145 additions and 101 deletions
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6
components/layout/display_list_builder.rs
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@ -18,7 +18,7 @@ use context::SharedLayoutContext;
use euclid::{Matrix4D, Point2D, Radians, Rect, SideOffsets2D, Size2D};
use flex::FlexFlow;
use flow::{BaseFlow, Flow, IS_ABSOLUTELY_POSITIONED};
use flow_ref;
use flow_ref::FlowRef;
use fragment::{CoordinateSystem, Fragment, ImageFragmentInfo, ScannedTextFragmentInfo};
use fragment::SpecificFragmentInfo;
use gfx::display_list::{BLUR_INFLATION_FACTOR, BaseDisplayItem, BorderDisplayItem};
@ -1994,11 +1994,11 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
for mut fragment in self.fragments.fragments.iter_mut() {
match fragment.specific {
SpecificFragmentInfo::InlineBlock(ref mut block_flow) => {
let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
let block_flow = FlowRef::deref_mut(&mut block_flow.flow_ref);
block_flow.collect_stacking_contexts(parent, parent_scroll_root_id);
}
SpecificFragmentInfo::InlineAbsoluteHypothetical(ref mut block_flow) => {
let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
let block_flow = FlowRef::deref_mut(&mut block_flow.flow_ref);
block_flow.collect_stacking_contexts(parent, parent_scroll_root_id);
}
_ if fragment.establishes_stacking_context() => {