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layout: Stop doing unsafe transmutes between refcell references.

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This commit splits the style and layout data in two separate refcells.

These transmutes have been a source of trouble (for example on Android), and
they feel like a hack anyway.

Fixes #16982
This commit is contained in:
Emilio Cobos Álvarez 2017-05-24 19:15:12 +02:00
parent bb310efbb9
commit deaa935f5b
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GPG key ID: 056B727BB9C1027C
9 changed files with 79 additions and 94 deletions
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12
components/script/layout_wrapper.rs
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@ -47,7 +47,7 @@ use html5ever::{LocalName, Namespace};
use msg::constellation_msg::{BrowsingContextId, PipelineId};
use range::Range;
use script_layout_interface::{HTMLCanvasData, LayoutNodeType, SVGSVGData, TrustedNodeAddress};
use script_layout_interface::{OpaqueStyleAndLayoutData, PartialPersistentLayoutData};
use script_layout_interface::{OpaqueStyleAndLayoutData, StyleData};
use script_layout_interface::wrapper_traits::{DangerousThreadSafeLayoutNode, GetLayoutData, LayoutNode};
use script_layout_interface::wrapper_traits::{PseudoElementType, ThreadSafeLayoutElement, ThreadSafeLayoutNode};
use selectors::attr::{AttrSelectorOperation, NamespaceConstraint};
@ -452,12 +452,12 @@ impl<'le> TElement for ServoLayoutElement<'le> {
}
fn store_children_to_process(&self, n: isize) {
let data = self.get_partial_layout_data().unwrap().borrow();
let data = self.get_style_data().unwrap();
data.parallel.children_to_process.store(n, Ordering::Relaxed);
}
fn did_process_child(&self) -> isize {
let data = self.get_partial_layout_data().unwrap().borrow();
let data = self.get_style_data().unwrap();
let old_value = data.parallel.children_to_process.fetch_sub(1, Ordering::Relaxed);
debug_assert!(old_value >= 1);
old_value - 1
@ -466,9 +466,7 @@ impl<'le> TElement for ServoLayoutElement<'le> {
fn get_data(&self) -> Option<&AtomicRefCell<ElementData>> {
unsafe {
self.get_style_and_layout_data().map(|d| {
let ppld: &AtomicRefCell<PartialPersistentLayoutData> = &*d.ptr.get();
let psd: &AtomicRefCell<ElementData> = transmute(ppld);
psd
&(*d.ptr.get()).element_data
})
}
}
@ -537,7 +535,7 @@ impl<'le> ServoLayoutElement<'le> {
}
}
fn get_partial_layout_data(&self) -> Option<&AtomicRefCell<PartialPersistentLayoutData>> {
fn get_style_data(&self) -> Option<&StyleData> {
unsafe {
self.get_style_and_layout_data().map(|d| &*d.ptr.get())
}