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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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28
components/layout_thread/lib.rs
View file

@ -65,7 +65,7 @@ use layout::construct::ConstructionResult;
use layout::context::{LayoutContext, SharedLayoutContext, heap_size_of_local_context};
use layout::display_list_builder::ToGfxColor;
use layout::flow::{self, Flow, ImmutableFlowUtils, MutableFlowUtils, MutableOwnedFlowUtils};
use layout::flow_ref::{self, FlowRef};
use layout::flow_ref::FlowRef;
use layout::incremental::{LayoutDamageComputation, REFLOW_ENTIRE_DOCUMENT};
use layout::layout_debug;
use layout::parallel;
@ -594,7 +594,7 @@ impl LayoutThread {
let mut rw_data = possibly_locked_rw_data.lock();
if let Some(mut root_flow) = self.root_flow.clone() {
let flow = flow::mut_base(flow_ref::deref_mut(&mut root_flow));
let flow = flow::mut_base(FlowRef::deref_mut(&mut root_flow));
flow.restyle_damage.insert(REPAINT);
}
@ -836,7 +836,7 @@ impl LayoutThread {
_ => return None,
};
flow_ref::deref_mut(&mut flow).mark_as_root();
FlowRef::deref_mut(&mut flow).mark_as_root();
Some(flow)
}
@ -1120,7 +1120,7 @@ impl LayoutThread {
}
if needs_reflow {
if let Some(mut flow) = self.try_get_layout_root(node) {
LayoutThread::reflow_all_nodes(flow_ref::deref_mut(&mut flow));
LayoutThread::reflow_all_nodes(FlowRef::deref_mut(&mut flow));
}
}
@ -1197,7 +1197,7 @@ impl LayoutThread {
Some(root_flow) => root_flow,
None => return,
};
let root_flow = flow_ref::deref_mut(&mut root_flow);
let root_flow = FlowRef::deref_mut(&mut root_flow);
match *query_type {
ReflowQueryType::ContentBoxQuery(node) => {
let node = unsafe { ServoLayoutNode::new(&node) };
@ -1303,7 +1303,7 @@ impl LayoutThread {
self.time_profiler_chan.clone(),
|| {
animation::recalc_style_for_animations(&layout_context,
flow_ref::deref_mut(&mut root_flow),
FlowRef::deref_mut(&mut root_flow),
&animations)
});
}
@ -1361,10 +1361,10 @@ impl LayoutThread {
|| {
// Call `compute_layout_damage` even in non-incremental mode, because it sets flags
// that are needed in both incremental and non-incremental traversals.
let damage = flow_ref::deref_mut(&mut root_flow).compute_layout_damage();
let damage = FlowRef::deref_mut(&mut root_flow).compute_layout_damage();
if opts::get().nonincremental_layout || damage.contains(REFLOW_ENTIRE_DOCUMENT) {
flow_ref::deref_mut(&mut root_flow).reflow_entire_document()
FlowRef::deref_mut(&mut root_flow).reflow_entire_document()
}
});
@ -1376,13 +1376,13 @@ impl LayoutThread {
profile(time::ProfilerCategory::LayoutGeneratedContent,
self.profiler_metadata(),
self.time_profiler_chan.clone(),
|| sequential::resolve_generated_content(flow_ref::deref_mut(&mut root_flow), &layout_context));
|| sequential::resolve_generated_content(FlowRef::deref_mut(&mut root_flow), &layout_context));
// Guess float placement.
profile(time::ProfilerCategory::LayoutFloatPlacementSpeculation,
self.profiler_metadata(),
self.time_profiler_chan.clone(),
|| sequential::guess_float_placement(flow_ref::deref_mut(&mut root_flow)));
|| sequential::guess_float_placement(FlowRef::deref_mut(&mut root_flow)));
// Perform the primary layout passes over the flow tree to compute the locations of all
// the boxes.
@ -1395,12 +1395,12 @@ impl LayoutThread {
match self.parallel_traversal {
None => {
// Sequential mode.
LayoutThread::solve_constraints(flow_ref::deref_mut(&mut root_flow), &layout_context)
LayoutThread::solve_constraints(FlowRef::deref_mut(&mut root_flow), &layout_context)
}
Some(ref mut parallel) => {
// Parallel mode.
LayoutThread::solve_constraints_parallel(parallel,
flow_ref::deref_mut(&mut root_flow),
FlowRef::deref_mut(&mut root_flow),
profiler_metadata,
self.time_profiler_chan.clone(),
&*layout_context);
@ -1415,7 +1415,7 @@ impl LayoutThread {
|| {
let layout_context = LayoutContext::new(&*layout_context);
sequential::store_overflow(&layout_context,
flow_ref::deref_mut(&mut root_flow) as &mut Flow);
FlowRef::deref_mut(&mut root_flow) as &mut Flow);
});
self.perform_post_main_layout_passes(data,
@ -1437,7 +1437,7 @@ impl LayoutThread {
self.compute_abs_pos_and_build_display_list(data,
query_type,
document,
flow_ref::deref_mut(&mut root_flow),
FlowRef::deref_mut(&mut root_flow),
&mut *layout_context,
rw_data);
self.first_reflow = false;