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Rename PrivateStyleData to PersistentStyleData and use AtomicRefCell instead of RefCell as a container.

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This allows us to eliminate the unsafe borrows. \o/

MozReview-Commit-ID: 29hpGaWUFQz
This commit is contained in:
Bobby Holley 2016-09-29 17:09:06 -07:00
parent 5bcc4192bf
commit 687e1f701c
12 changed files with 96 additions and 142 deletions
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55
components/layout/wrapper.rs
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@ -31,33 +31,25 @@
#![allow(unsafe_code)]
use core::nonzero::NonZero;
use data::{LayoutDataFlags, PrivateLayoutData};
use script_layout_interface::{OpaqueStyleAndLayoutData, PartialStyleAndLayoutData};
use data::{LayoutDataFlags, PersistentLayoutData};
use script_layout_interface::{OpaqueStyleAndLayoutData, PartialPersistentLayoutData};
use script_layout_interface::wrapper_traits::{LayoutNode, ThreadSafeLayoutNode};
use style::atomic_refcell::{AtomicRef, AtomicRefCell, AtomicRefMut};
use style::computed_values::content::{self, ContentItem};
use style::refcell::{Ref, RefCell, RefMut};
pub type NonOpaqueStyleAndLayoutData = *mut RefCell<PrivateLayoutData>;
pub type NonOpaqueStyleAndLayoutData = *mut AtomicRefCell<PersistentLayoutData>;
pub trait LayoutNodeLayoutData {
/// Similar to borrow_data*, but returns the full PrivateLayoutData rather
/// than only the PrivateStyleData.
unsafe fn borrow_layout_data_unchecked(&self) -> Option<*const PrivateLayoutData>;
fn borrow_layout_data(&self) -> Option<Ref<PrivateLayoutData>>;
fn mutate_layout_data(&self) -> Option<RefMut<PrivateLayoutData>>;
/// Similar to borrow_data*, but returns the full PersistentLayoutData rather
/// than only the PersistentStyleData.
fn borrow_layout_data(&self) -> Option<AtomicRef<PersistentLayoutData>>;
fn mutate_layout_data(&self) -> Option<AtomicRefMut<PersistentLayoutData>>;
fn initialize_data(self);
fn flow_debug_id(self) -> usize;
}
impl<T: LayoutNode> LayoutNodeLayoutData for T {
unsafe fn borrow_layout_data_unchecked(&self) -> Option<*const PrivateLayoutData> {
self.get_style_and_layout_data().map(|opaque| {
let container = *opaque.ptr as NonOpaqueStyleAndLayoutData;
&(*(*container).as_unsafe_cell().get()) as *const PrivateLayoutData
})
}
fn borrow_layout_data(&self) -> Option<Ref<PrivateLayoutData>> {
fn borrow_layout_data(&self) -> Option<AtomicRef<PersistentLayoutData>> {
unsafe {
self.get_style_and_layout_data().map(|opaque| {
let container = *opaque.ptr as NonOpaqueStyleAndLayoutData;
@ -66,7 +58,7 @@ impl<T: LayoutNode> LayoutNodeLayoutData for T {
}
}
fn mutate_layout_data(&self) -> Option<RefMut<PrivateLayoutData>> {
fn mutate_layout_data(&self) -> Option<AtomicRefMut<PersistentLayoutData>> {
unsafe {
self.get_style_and_layout_data().map(|opaque| {
let container = *opaque.ptr as NonOpaqueStyleAndLayoutData;
@ -76,11 +68,11 @@ impl<T: LayoutNode> LayoutNodeLayoutData for T {
}
fn initialize_data(self) {
if unsafe { self.borrow_data_unchecked() }.is_none() {
if self.borrow_data().is_none() {
let ptr: NonOpaqueStyleAndLayoutData =
Box::into_raw(box RefCell::new(PrivateLayoutData::new()));
Box::into_raw(box AtomicRefCell::new(PersistentLayoutData::new()));
let opaque = OpaqueStyleAndLayoutData {
ptr: unsafe { NonZero::new(ptr as *mut RefCell<PartialStyleAndLayoutData>) }
ptr: unsafe { NonZero::new(ptr as *mut AtomicRefCell<PartialPersistentLayoutData>) }
};
self.init_style_and_layout_data(opaque);
}
@ -94,19 +86,17 @@ impl<T: LayoutNode> LayoutNodeLayoutData for T {
pub trait ThreadSafeLayoutNodeHelpers {
fn flow_debug_id(self) -> usize;
unsafe fn borrow_layout_data_unchecked(&self) -> Option<*const PrivateLayoutData>;
/// Borrows the layout data immutably. Fails on a conflicting borrow.
///
/// TODO(pcwalton): Make this private. It will let us avoid borrow flag checks in some cases.
#[inline(always)]
fn borrow_layout_data(&self) -> Option<Ref<PrivateLayoutData>>;
fn borrow_layout_data(&self) -> Option<AtomicRef<PersistentLayoutData>>;
/// Borrows the layout data mutably. Fails on a conflicting borrow.
///
/// TODO(pcwalton): Make this private. It will let us avoid borrow flag checks in some cases.
#[inline(always)]
fn mutate_layout_data(&self) -> Option<RefMut<PrivateLayoutData>>;
fn mutate_layout_data(&self) -> Option<AtomicRefMut<PersistentLayoutData>>;
/// Returns the layout data flags for this node.
fn flags(self) -> LayoutDataFlags;
@ -129,14 +119,7 @@ impl<T: ThreadSafeLayoutNode> ThreadSafeLayoutNodeHelpers for T {
self.borrow_layout_data().map_or(0, |d| d.flow_construction_result.debug_id())
}
unsafe fn borrow_layout_data_unchecked(&self) -> Option<*const PrivateLayoutData> {
self.get_style_and_layout_data().map(|opaque| {
let container = *opaque.ptr as NonOpaqueStyleAndLayoutData;
&(*(*container).as_unsafe_cell().get()) as *const PrivateLayoutData
})
}
fn borrow_layout_data(&self) -> Option<Ref<PrivateLayoutData>> {
fn borrow_layout_data(&self) -> Option<AtomicRef<PersistentLayoutData>> {
unsafe {
self.get_style_and_layout_data().map(|opaque| {
let container = *opaque.ptr as NonOpaqueStyleAndLayoutData;
@ -145,7 +128,7 @@ impl<T: ThreadSafeLayoutNode> ThreadSafeLayoutNodeHelpers for T {
}
}
fn mutate_layout_data(&self) -> Option<RefMut<PrivateLayoutData>> {
fn mutate_layout_data(&self) -> Option<AtomicRefMut<PersistentLayoutData>> {
unsafe {
self.get_style_and_layout_data().map(|opaque| {
let container = *opaque.ptr as NonOpaqueStyleAndLayoutData;
@ -155,9 +138,7 @@ impl<T: ThreadSafeLayoutNode> ThreadSafeLayoutNodeHelpers for T {
}
fn flags(self) -> LayoutDataFlags {
unsafe {
(*self.borrow_layout_data_unchecked().unwrap()).flags
}
self.borrow_layout_data().as_ref().unwrap().flags
}
fn insert_flags(self, new_flags: LayoutDataFlags) {