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Auto merge of #14610 - bholley:style_context_refactor, r=emilio

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Simplify style context architecture and make it safer

See the discussion at https://bugzilla.mozilla.org/show_bug.cgi?id=1323372

Not done here, but want to get a try run in on the first patch.

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This commit is contained in:
bors-servo 2016-12-16 11:38:27 -08:00 • committed by GitHub
commit a4ecdf2d5f
18 changed files with 329 additions and 323 deletions
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2
components/layout/block.rs
View file

@ -55,7 +55,7 @@ use std::fmt;
use std::sync::Arc;
use style::computed_values::{border_collapse, box_sizing, display, float, overflow_x, overflow_y};
use style::computed_values::{position, text_align};
use style::context::{SharedStyleContext, StyleContext};
use style::context::SharedStyleContext;
use style::logical_geometry::{LogicalPoint, LogicalRect, LogicalSize, WritingMode};
use style::properties::ServoComputedValues;
use style::servo::restyle_damage::{BUBBLE_ISIZES, REFLOW, REFLOW_OUT_OF_FLOW, REPOSITION};

75
components/layout/context.rs
View file

@ -25,22 +25,39 @@ use std::collections::HashMap;
use std::hash::BuildHasherDefault;
use std::rc::Rc;
use std::sync::{Arc, Mutex};
use style::context::{LocalStyleContext, StyleContext, SharedStyleContext};
use style::context::{SharedStyleContext, ThreadLocalStyleContext};
struct LocalLayoutContext {
style_context: LocalStyleContext,
font_context: RefCell<FontContext>,
pub struct ThreadLocalLayoutContext {
pub style_context: ThreadLocalStyleContext,
pub font_context: RefCell<FontContext>,
}
impl HeapSizeOf for LocalLayoutContext {
impl ThreadLocalLayoutContext {
pub fn new(shared: &SharedLayoutContext) -> Rc<Self> {
let font_cache_thread = shared.font_cache_thread.lock().unwrap().clone();
let local_style_data = shared.style_context.local_context_creation_data.lock().unwrap();
Rc::new(ThreadLocalLayoutContext {
style_context: ThreadLocalStyleContext::new(&local_style_data),
font_context: RefCell::new(FontContext::new(font_cache_thread)),
})
}
}
impl Borrow<ThreadLocalStyleContext> for ThreadLocalLayoutContext {
fn borrow(&self) -> &ThreadLocalStyleContext {
&self.style_context
}
}
impl HeapSizeOf for ThreadLocalLayoutContext {
// FIXME(njn): measure other fields eventually.
fn heap_size_of_children(&self) -> usize {
self.font_context.heap_size_of_children()
}
}
thread_local!(static LOCAL_CONTEXT_KEY: RefCell<Option<Rc<LocalLayoutContext>>> = RefCell::new(None));
thread_local!(static LOCAL_CONTEXT_KEY: RefCell<Option<Rc<ThreadLocalLayoutContext>>> = RefCell::new(None));
pub fn heap_size_of_local_context() -> usize {
LOCAL_CONTEXT_KEY.with(|r| {
@ -49,20 +66,14 @@ pub fn heap_size_of_local_context() -> usize {
}
// Keep this implementation in sync with the one in ports/geckolib/traversal.rs.
fn create_or_get_local_context(shared_layout_context: &SharedLayoutContext)
-> Rc<LocalLayoutContext> {
pub fn create_or_get_local_context(shared: &SharedLayoutContext)
-> Rc<ThreadLocalLayoutContext> {
LOCAL_CONTEXT_KEY.with(|r| {
let mut r = r.borrow_mut();
if let Some(context) = r.clone() {
context
} else {
let font_cache_thread = shared_layout_context.font_cache_thread.lock().unwrap().clone();
let local_style_data = shared_layout_context.style_context.local_context_creation_data.lock().unwrap();
let context = Rc::new(LocalLayoutContext {
style_context: LocalStyleContext::new(&local_style_data),
font_context: RefCell::new(FontContext::new(font_cache_thread)),
});
let context = ThreadLocalLayoutContext::new(shared);
*r = Some(context.clone());
context
}
@ -97,27 +108,27 @@ impl Borrow<SharedStyleContext> for SharedLayoutContext {
pub struct LayoutContext<'a> {
pub shared: &'a SharedLayoutContext,
cached_local_layout_context: Rc<LocalLayoutContext>,
pub thread_local: &'a ThreadLocalLayoutContext,
}
impl<'a> StyleContext<'a> for LayoutContext<'a> {
fn shared_context(&self) -> &'a SharedStyleContext {
&self.shared.style_context
}
fn local_context(&self) -> &LocalStyleContext {
&self.cached_local_layout_context.style_context
impl<'a> LayoutContext<'a> {
pub fn new(shared: &'a SharedLayoutContext,
thread_local: &'a ThreadLocalLayoutContext) -> Self
{
LayoutContext {
shared: shared,
thread_local: thread_local,
}
}
}
impl<'a> LayoutContext<'a> {
pub fn new(shared_layout_context: &'a SharedLayoutContext) -> LayoutContext<'a> {
let local_context = create_or_get_local_context(shared_layout_context);
LayoutContext {
shared: shared_layout_context,
cached_local_layout_context: local_context,
}
// FIXME(bholley): The following two methods are identical and should be merged.
// shared_context() is the appropriate name, but it involves renaming a lot of
// calls.
#[inline(always)]
pub fn shared_context(&self) -> &SharedStyleContext {
&self.shared.style_context
}
#[inline(always)]
@ -127,7 +138,7 @@ impl<'a> LayoutContext<'a> {
#[inline(always)]
pub fn font_context(&self) -> RefMut<FontContext> {
self.cached_local_layout_context.font_context.borrow_mut()
self.thread_local.font_context.borrow_mut()
}
}

2
components/layout/flex.rs
View file

@ -26,7 +26,7 @@ use std::ops::Range;
use std::sync::Arc;
use style::computed_values::{align_content, align_self, flex_direction, flex_wrap, justify_content};
use style::computed_values::border_collapse;
use style::context::{SharedStyleContext, StyleContext};
use style::context::SharedStyleContext;
use style::logical_geometry::{Direction, LogicalSize};
use style::properties::ServoComputedValues;
use style::servo::restyle_damage::{REFLOW, REFLOW_OUT_OF_FLOW};

2
components/layout/inline.rs
View file

@ -32,7 +32,7 @@ use std::sync::Arc;
use style::arc_ptr_eq;
use style::computed_values::{display, overflow_x, position, text_align, text_justify};
use style::computed_values::{vertical_align, white_space};
use style::context::{SharedStyleContext, StyleContext};
use style::context::SharedStyleContext;
use style::logical_geometry::{LogicalRect, LogicalSize, WritingMode};
use style::properties::{longhands, ServoComputedValues};
use style::servo::restyle_damage::{BUBBLE_ISIZES, REFLOW, REFLOW_OUT_OF_FLOW, REPOSITION, RESOLVE_GENERATED_CONTENT};

2
components/layout/multicol.rs
View file

@ -21,7 +21,7 @@ use gfx_traits::print_tree::PrintTree;
use std::cmp::{min, max};
use std::fmt;
use std::sync::Arc;
use style::context::{StyleContext, SharedStyleContext};
use style::context::SharedStyleContext;
use style::logical_geometry::LogicalSize;
use style::properties::ServoComputedValues;
use style::values::Either;

28
components/layout/parallel.rs
View file

@ -8,7 +8,8 @@
#![allow(unsafe_code)]
use context::{LayoutContext, SharedLayoutContext};
use context::{LayoutContext, SharedLayoutContext, ThreadLocalLayoutContext};
use context::create_or_get_local_context;
use flow::{self, Flow, MutableFlowUtils, PostorderFlowTraversal, PreorderFlowTraversal};
use flow_ref::FlowRef;
use profile_traits::time::{self, TimerMetadata, profile};
@ -52,7 +53,7 @@ pub fn borrowed_flow_to_unsafe_flow(flow: &Flow) -> UnsafeFlow {
pub type ChunkedFlowTraversalFunction<'scope> =
extern "Rust" fn(Box<[UnsafeFlow]>, &'scope SharedLayoutContext, &rayon::Scope<'scope>);
pub type FlowTraversalFunction = extern "Rust" fn(UnsafeFlow, &SharedLayoutContext);
pub type FlowTraversalFunction = extern "Rust" fn(UnsafeFlow, &LayoutContext);
/// Information that we need stored in each flow.
pub struct FlowParallelInfo {
@ -140,11 +141,14 @@ trait ParallelPreorderFlowTraversal : PreorderFlowTraversal {
#[inline(always)]
fn run_parallel_helper<'scope>(&self,
unsafe_flows: &[UnsafeFlow],
layout_context: &'scope SharedLayoutContext,
shared: &'scope SharedLayoutContext,
scope: &rayon::Scope<'scope>,
top_down_func: ChunkedFlowTraversalFunction<'scope>,
bottom_up_func: FlowTraversalFunction)
{
let tlc = create_or_get_local_context(shared);
let context = LayoutContext::new(&shared, &*tlc);
let mut discovered_child_flows = vec![];
for unsafe_flow in unsafe_flows {
let mut had_children = false;
@ -175,7 +179,7 @@ trait ParallelPreorderFlowTraversal : PreorderFlowTraversal {
// If there were no more children, start assigning block-sizes.
if !had_children {
bottom_up_func(*unsafe_flow, layout_context)
bottom_up_func(*unsafe_flow, &context)
}
}
@ -183,7 +187,7 @@ trait ParallelPreorderFlowTraversal : PreorderFlowTraversal {
let nodes = chunk.iter().cloned().collect::<Vec<_>>().into_boxed_slice();
scope.spawn(move |scope| {
top_down_func(nodes, layout_context, scope);
top_down_func(nodes, shared, scope);
});
}
}
@ -220,10 +224,9 @@ fn assign_inline_sizes<'scope>(unsafe_flows: Box<[UnsafeFlow]>,
fn assign_block_sizes_and_store_overflow(
unsafe_flow: UnsafeFlow,
shared_layout_context: &SharedLayoutContext) {
let layout_context = LayoutContext::new(shared_layout_context);
context: &LayoutContext) {
let assign_block_sizes_traversal = AssignBSizes {
layout_context: &layout_context,
layout_context: context,
};
assign_block_sizes_traversal.run_parallel(unsafe_flow)
}
@ -232,11 +235,12 @@ pub fn traverse_flow_tree_preorder(
root: &mut Flow,
profiler_metadata: Option<TimerMetadata>,
time_profiler_chan: time::ProfilerChan,
shared_layout_context: &SharedLayoutContext,
shared: &SharedLayoutContext,
queue: &rayon::ThreadPool) {
if opts::get().bubble_inline_sizes_separately {
let layout_context = LayoutContext::new(shared_layout_context);
let bubble_inline_sizes = BubbleISizes { layout_context: &layout_context };
let tlc = ThreadLocalLayoutContext::new(shared);
let context = LayoutContext::new(shared, &*tlc);
let bubble_inline_sizes = BubbleISizes { layout_context: &context };
root.traverse_postorder(&bubble_inline_sizes);
}
@ -246,7 +250,7 @@ pub fn traverse_flow_tree_preorder(
rayon::scope(move |scope| {
profile(time::ProfilerCategory::LayoutParallelWarmup,
profiler_metadata, time_profiler_chan, move || {
assign_inline_sizes(nodes, &shared_layout_context, scope);
assign_inline_sizes(nodes, &shared, scope);
});
});
});

23
components/layout/query.rs
View file

@ -6,6 +6,8 @@
use app_units::Au;
use construct::ConstructionResult;
use context::SharedLayoutContext;
use context::create_or_get_local_context;
use euclid::point::Point2D;
use euclid::rect::Rect;
use euclid::size::Size2D;
@ -624,13 +626,12 @@ pub fn process_node_scroll_area_request< N: LayoutNode>(requested_node: N, layou
/// Return the resolved value of property for a given (pseudo)element.
/// https://drafts.csswg.org/cssom/#resolved-value
pub fn process_resolved_style_request<'a, N, C>(requested_node: N,
style_context: &'a C,
pseudo: &Option<PseudoElement>,
property: &PropertyId,
layout_root: &mut Flow) -> String
pub fn process_resolved_style_request<'a, N>(shared: &SharedLayoutContext,
requested_node: N,
pseudo: &Option<PseudoElement>,
property: &PropertyId,
layout_root: &mut Flow) -> String
where N: LayoutNode,
C: StyleContext<'a>
{
use style::traversal::{clear_descendant_data, style_element_in_display_none_subtree};
let element = requested_node.as_element().unwrap();
@ -645,8 +646,14 @@ pub fn process_resolved_style_request<'a, N, C>(requested_node: N,
// we'd need a mechanism to prevent detect when it's stale (since we don't
// traverse display:none subtrees during restyle).
let display_none_root = if element.get_data().is_none() {
Some(style_element_in_display_none_subtree(element, &|e| e.as_node().initialize_data(),
style_context))
let tlc = create_or_get_local_context(shared);
let context = StyleContext {
shared: &shared.style_context,
thread_local: &tlc.style_context,
};
Some(style_element_in_display_none_subtree(&context, element,
&|e| e.as_node().initialize_data()))
} else {
None
};

13
components/layout/sequential.rs
View file

@ -5,7 +5,7 @@
//! Implements sequential traversals over the DOM and flow trees.
use app_units::Au;
use context::{LayoutContext, SharedLayoutContext};
use context::{LayoutContext, SharedLayoutContext, ThreadLocalLayoutContext};
use display_list_builder::DisplayListBuildState;
use euclid::point::Point2D;
use floats::SpeculatedFloatPlacement;
@ -16,13 +16,12 @@ use fragment::FragmentBorderBoxIterator;
use generated_content::ResolveGeneratedContent;
use gfx_traits::ScrollRootId;
use servo_config::opts;
use style::context::StyleContext;
use style::servo::restyle_damage::{REFLOW, STORE_OVERFLOW};
use traversal::{AssignBSizes, AssignISizes, BubbleISizes, BuildDisplayList};
pub use style::sequential::traverse_dom;
pub fn resolve_generated_content(root: &mut Flow, shared_layout_context: &SharedLayoutContext) {
pub fn resolve_generated_content(root: &mut Flow, shared: &SharedLayoutContext) {
fn doit(flow: &mut Flow, level: u32, traversal: &mut ResolveGeneratedContent) {
if !traversal.should_process(flow) {
return
@ -35,13 +34,14 @@ pub fn resolve_generated_content(root: &mut Flow, shared_layout_context: &Shared
}
}
let layout_context = LayoutContext::new(shared_layout_context);
let tlc = ThreadLocalLayoutContext::new(shared);
let layout_context = LayoutContext::new(shared, &*tlc);
let mut traversal = ResolveGeneratedContent::new(&layout_context);
doit(root, 0, &mut traversal)
}
pub fn traverse_flow_tree_preorder(root: &mut Flow,
shared_layout_context: &SharedLayoutContext) {
shared: &SharedLayoutContext) {
fn doit(flow: &mut Flow,
assign_inline_sizes: AssignISizes,
assign_block_sizes: AssignBSizes) {
@ -58,7 +58,8 @@ pub fn traverse_flow_tree_preorder(root: &mut Flow,
}
}
let layout_context = LayoutContext::new(shared_layout_context);
let tlc = ThreadLocalLayoutContext::new(shared);
let layout_context = LayoutContext::new(shared, &*tlc);
if opts::get().bubble_inline_sizes_separately {
let bubble_inline_sizes = BubbleISizes { layout_context: &layout_context };

100
components/layout/traversal.rs
View file

@ -5,74 +5,59 @@
//! Traversals over the DOM and flow trees, running the layout computations.
use construct::FlowConstructor;
use context::{LayoutContext, SharedLayoutContext};
use context::{LayoutContext, SharedLayoutContext, ThreadLocalLayoutContext};
use context::create_or_get_local_context;
use display_list_builder::DisplayListBuildState;
use flow::{self, PreorderFlowTraversal};
use flow::{CAN_BE_FRAGMENTED, Flow, ImmutableFlowUtils, PostorderFlowTraversal};
use gfx::display_list::OpaqueNode;
use script_layout_interface::wrapper_traits::{LayoutNode, ThreadSafeLayoutNode};
use servo_config::opts;
use std::mem;
use std::rc::Rc;
use style::atomic_refcell::AtomicRefCell;
use style::context::{LocalStyleContext, SharedStyleContext, StyleContext};
use style::context::{SharedStyleContext, StyleContext};
use style::data::ElementData;
use style::dom::{TElement, TNode};
use style::selector_parser::RestyleDamage;
use style::servo::restyle_damage::{BUBBLE_ISIZES, REFLOW, REFLOW_OUT_OF_FLOW, REPAINT};
use style::traversal::{DomTraversalContext, recalc_style_at, remove_from_bloom_filter};
use style::traversal::{DomTraversal, recalc_style_at, remove_from_bloom_filter};
use style::traversal::PerLevelTraversalData;
use wrapper::{GetRawData, LayoutNodeHelpers, LayoutNodeLayoutData};
pub struct RecalcStyleAndConstructFlows<'lc> {
context: LayoutContext<'lc>,
pub struct RecalcStyleAndConstructFlows {
shared: SharedLayoutContext,
root: OpaqueNode,
}
#[allow(unsafe_code)]
impl<'lc, N> DomTraversalContext<N> for RecalcStyleAndConstructFlows<'lc>
where N: LayoutNode + TNode,
N::ConcreteElement: TElement
impl RecalcStyleAndConstructFlows {
pub fn shared_layout_context(&self) -> &SharedLayoutContext {
&self.shared
}
}
{
type SharedContext = SharedLayoutContext;
#[allow(unsafe_code)]
fn new<'a>(shared: &'a Self::SharedContext, root: OpaqueNode) -> Self {
// FIXME(bholley): This transmutation from &'a to &'lc is very unfortunate, but I haven't
// found a way to avoid it despite spending several days on it (and consulting Manishearth,
// brson, and nmatsakis).
//
// The crux of the problem is that parameterizing DomTraversalContext on the lifetime of
// the SharedContext doesn't work for a variety of reasons [1]. However, the code in
// parallel.rs needs to be able to use the DomTraversalContext trait (or something similar)
// to stack-allocate a struct (a generalized LayoutContext<'a>) that holds a borrowed
// SharedContext, which means that the struct needs to be parameterized on a lifetime.
// Given the aforementioned constraint, the only way to accomplish this is to avoid
// propagating the borrow lifetime from the struct to the trait, but that means that the
// new() method on the trait cannot require the lifetime of its argument to match the
// lifetime of the Self object it creates.
//
// This could be solved with an associated type with an unbound lifetime parameter, but
// that would require higher-kinded types, which don't exist yet and probably aren't coming
// for a while.
//
// So we transmute. :-( This is safe because the DomTravesalContext is stack-allocated on
// the worker thread while processing a WorkUnit, whereas the borrowed SharedContext is
// live for the entire duration of the restyle. This really could _almost_ compile: all
// we'd need to do is change the signature to to |new<'a: 'lc>|, and everything would
// work great. But we can't do that, because that would cause a mismatch with the signature
// in the trait we're implementing, and we can't mention 'lc in that trait at all for the
// reasons described above.
//
// [1] For example, the WorkQueue type needs to be parameterized on the concrete type of
// DomTraversalContext::SharedContext, and the WorkQueue lifetime is similar to that of the
// LayoutThread, generally much longer than that of a given SharedLayoutContext borrow.
let shared_lc: &'lc SharedLayoutContext = unsafe { mem::transmute(shared) };
impl RecalcStyleAndConstructFlows {
/// Creates a traversal context, taking ownership of the shared layout context.
pub fn new(shared: SharedLayoutContext, root: OpaqueNode) -> Self {
RecalcStyleAndConstructFlows {
context: LayoutContext::new(shared_lc),
shared: shared,
root: root,
}
}
/// Consumes this traversal context, returning ownership of the shared layout
/// context to the caller.
pub fn destroy(self) -> SharedLayoutContext {
self.shared
}
}
#[allow(unsafe_code)]
impl<N> DomTraversal<N> for RecalcStyleAndConstructFlows
where N: LayoutNode + TNode,
N::ConcreteElement: TElement
{
type ThreadLocalContext = ThreadLocalLayoutContext;
fn process_preorder(&self, node: N, traversal_data: &mut PerLevelTraversalData) {
// FIXME(pcwalton): Stop allocating here. Ideally this should just be
// done by the HTML parser.
@ -81,12 +66,19 @@ impl<'lc, N> DomTraversalContext<N> for RecalcStyleAndConstructFlows<'lc>
if !node.is_text_node() {
let el = node.as_element().unwrap();
let mut data = el.mutate_data().unwrap();
recalc_style_at::<_, _, Self>(&self.context, traversal_data, el, &mut data);
let tlc = create_or_get_local_context(&self.shared);
let context = StyleContext {
shared: &self.shared.style_context,
thread_local: &tlc.style_context,
};
recalc_style_at(self, traversal_data, &context, el, &mut data);
}
}
fn process_postorder(&self, node: N) {
construct_flows_at(&self.context, self.root, node);
let tlc = create_or_get_local_context(&self.shared);
let context = LayoutContext::new(&self.shared, &*tlc);
construct_flows_at(&context, self.root, node);
}
fn text_node_needs_traversal(node: N) -> bool {
@ -107,8 +99,12 @@ impl<'lc, N> DomTraversalContext<N> for RecalcStyleAndConstructFlows<'lc>
element.as_node().clear_data();
}
fn local_context(&self) -> &LocalStyleContext {
self.context.local_context()
fn shared_context(&self) -> &SharedStyleContext {
&self.shared.style_context
}
fn create_or_get_thread_local_context(&self) -> Rc<ThreadLocalLayoutContext> {
create_or_get_local_context(&self.shared)
}
}
@ -121,7 +117,9 @@ pub trait PostorderNodeMutTraversal<ConcreteThreadSafeLayoutNode: ThreadSafeLayo
/// The flow construction traversal, which builds flows for styled nodes.
#[inline]
#[allow(unsafe_code)]
fn construct_flows_at<'a, N: LayoutNode>(context: &'a LayoutContext<'a>, root: OpaqueNode, node: N) {
fn construct_flows_at<'a, N>(context: &LayoutContext<'a>, root: OpaqueNode, node: N)
where N: LayoutNode,
{
debug!("construct_flows_at: {:?}", node);
// Construct flows for this node.
@ -146,7 +144,7 @@ fn construct_flows_at<'a, N: LayoutNode>(context: &'a LayoutContext<'a>, root: O
el.mutate_data().unwrap().persist();
unsafe { el.unset_dirty_descendants(); }
remove_from_bloom_filter(context, root, el);
remove_from_bloom_filter(&context.shared.style_context, root, el);
}
}

52
components/layout_thread/lib.rs
View file

@ -63,7 +63,7 @@ use ipc_channel::ipc::{self, IpcReceiver, IpcSender};
use ipc_channel::router::ROUTER;
use layout::animation;
use layout::construct::ConstructionResult;
use layout::context::{LayoutContext, SharedLayoutContext, heap_size_of_local_context};
use layout::context::{LayoutContext, SharedLayoutContext, ThreadLocalLayoutContext, heap_size_of_local_context};
use layout::display_list_builder::ToGfxColor;
use layout::flow::{self, Flow, ImmutableFlowUtils, MutableFlowUtils, MutableOwnedFlowUtils};
use layout::flow_ref::FlowRef;
@ -110,7 +110,7 @@ use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::mpsc::{Receiver, Sender, channel};
use std::thread;
use style::animation::Animation;
use style::context::{LocalStyleContextCreationInfo, ReflowGoal, SharedStyleContext};
use style::context::{ReflowGoal, SharedStyleContext, ThreadLocalStyleContextCreationInfo};
use style::data::StoredRestyleHint;
use style::dom::{ShowSubtree, ShowSubtreeDataAndPrimaryValues, TElement, TNode};
use style::error_reporting::{ParseErrorReporter, StdoutErrorReporter};
@ -122,7 +122,7 @@ use style::stylesheets::{Origin, Stylesheet, UserAgentStylesheets};
use style::stylist::Stylist;
use style::thread_state;
use style::timer::Timer;
use style::traversal::DomTraversalContext;
use style::traversal::DomTraversal;
/// Information needed by the layout thread.
pub struct LayoutThread {
@ -507,7 +507,8 @@ impl LayoutThread {
screen_size_changed: bool,
goal: ReflowGoal)
-> SharedLayoutContext {
let local_style_context_creation_data = LocalStyleContextCreationInfo::new(self.new_animations_sender.clone());
let thread_local_style_context_creation_data =
ThreadLocalStyleContextCreationInfo::new(self.new_animations_sender.clone());
SharedLayoutContext {
style_context: SharedStyleContext {
@ -519,7 +520,7 @@ impl LayoutThread {
running_animations: self.running_animations.clone(),
expired_animations: self.expired_animations.clone(),
error_reporter: self.error_reporter.clone(),
local_context_creation_data: Mutex::new(local_style_context_creation_data),
local_context_creation_data: Mutex::new(thread_local_style_context_creation_data),
timer: self.timer.clone(),
},
image_cache_thread: Mutex::new(self.image_cache_thread.clone()),
@ -1143,9 +1144,16 @@ impl LayoutThread {
viewport_size_changed,
data.reflow_info.goal);
// NB: Type inference falls apart here for some reason, so we need to be very verbose. :-(
let traversal = RecalcStyleAndConstructFlows::new(shared_layout_context, element.as_node().opaque());
let dom_depth = Some(0); // This is always the root node.
let token = <RecalcStyleAndConstructFlows as DomTraversalContext<ServoLayoutNode>>
::pre_traverse(element, &shared_layout_context.style_context.stylist, /* skip_root = */ false);
let token = {
let stylist = &<RecalcStyleAndConstructFlows as
DomTraversal<ServoLayoutNode>>::shared_context(&traversal).stylist;
<RecalcStyleAndConstructFlows as
DomTraversal<ServoLayoutNode>>::pre_traverse(element, stylist, /* skip_root = */ false)
};
if token.should_traverse() {
// Recalculate CSS styles and rebuild flows and fragments.
profile(time::ProfilerCategory::LayoutStyleRecalc,
@ -1153,14 +1161,14 @@ impl LayoutThread {
self.time_profiler_chan.clone(),
|| {
// Perform CSS selector matching and flow construction.
if let (true, Some(traversal)) = (self.parallel_flag, self.parallel_traversal.as_mut()) {
if let (true, Some(pool)) = (self.parallel_flag, self.parallel_traversal.as_mut()) {
// Parallel mode
parallel::traverse_dom::<ServoLayoutNode, RecalcStyleAndConstructFlows>(
element, dom_depth, &shared_layout_context, token, traversal);
&traversal, element, dom_depth, token, pool);
} else {
// Sequential mode
sequential::traverse_dom::<ServoLayoutNode, RecalcStyleAndConstructFlows>(
element, &shared_layout_context, token);
&traversal, element, token);
}
});
// TODO(pcwalton): Measure energy usage of text shaping, perhaps?
@ -1179,6 +1187,8 @@ impl LayoutThread {
self.root_flow = self.try_get_layout_root(element.as_node());
}
shared_layout_context = traversal.destroy();
if opts::get().dump_style_tree {
println!("{:?}", ShowSubtreeDataAndPrimaryValues(element.as_node()));
}
@ -1205,7 +1215,7 @@ impl LayoutThread {
fn respond_to_query_if_necessary(&mut self,
query_type: &ReflowQueryType,
rw_data: &mut LayoutThreadData,
shared_layout_context: &mut SharedLayoutContext) {
shared: &mut SharedLayoutContext) {
let mut root_flow = match self.root_flow.clone() {
Some(root_flow) => root_flow,
None => return,
@ -1253,10 +1263,9 @@ impl LayoutThread {
},
ReflowQueryType::ResolvedStyleQuery(node, ref pseudo, ref property) => {
let node = unsafe { ServoLayoutNode::new(&node) };
let layout_context = LayoutContext::new(&shared_layout_context);
rw_data.resolved_style_response =
process_resolved_style_request(node,
&layout_context,
process_resolved_style_request(shared,
node,
pseudo,
property,
root_flow);
@ -1365,7 +1374,7 @@ impl LayoutThread {
query_type: Option<&ReflowQueryType>,
document: Option<&ServoLayoutDocument>,
rw_data: &mut LayoutThreadData,
layout_context: &mut SharedLayoutContext) {
shared: &mut SharedLayoutContext) {
if let Some(mut root_flow) = self.root_flow.clone() {
// Kick off animations if any were triggered, expire completed ones.
animation::update_animation_state(&self.constellation_chan,
@ -1397,7 +1406,7 @@ impl LayoutThread {
profile(time::ProfilerCategory::LayoutGeneratedContent,
self.profiler_metadata(),
self.time_profiler_chan.clone(),
|| sequential::resolve_generated_content(FlowRef::deref_mut(&mut root_flow), &layout_context));
|| sequential::resolve_generated_content(FlowRef::deref_mut(&mut root_flow), &shared));
// Guess float placement.
profile(time::ProfilerCategory::LayoutFloatPlacementSpeculation,
@ -1420,10 +1429,10 @@ impl LayoutThread {
FlowRef::deref_mut(&mut root_flow),
profiler_metadata,
self.time_profiler_chan.clone(),
&*layout_context);
&*shared);
} else {
//Sequential mode
LayoutThread::solve_constraints(FlowRef::deref_mut(&mut root_flow), &layout_context)
LayoutThread::solve_constraints(FlowRef::deref_mut(&mut root_flow), &shared)
}
});
}
@ -1432,8 +1441,9 @@ impl LayoutThread {
self.profiler_metadata(),
self.time_profiler_chan.clone(),
|| {
let layout_context = LayoutContext::new(&*layout_context);
sequential::store_overflow(&layout_context,
let tlc = ThreadLocalLayoutContext::new(&shared);
let context = LayoutContext::new(&shared, &*tlc);
sequential::store_overflow(&context,
FlowRef::deref_mut(&mut root_flow) as &mut Flow);
});
@ -1441,7 +1451,7 @@ impl LayoutThread {
query_type,
document,
rw_data,
layout_context);
shared);
}
}

24
components/style/context.rs
View file

@ -19,13 +19,13 @@ use stylist::Stylist;
use timer::Timer;
/// This structure is used to create a local style context from a shared one.
pub struct LocalStyleContextCreationInfo {
pub struct ThreadLocalStyleContextCreationInfo {
new_animations_sender: Sender<Animation>,
}
impl LocalStyleContextCreationInfo {
impl ThreadLocalStyleContextCreationInfo {
pub fn new(animations_sender: Sender<Animation>) -> Self {
LocalStyleContextCreationInfo {
ThreadLocalStyleContextCreationInfo {
new_animations_sender: animations_sender,
}
}
@ -57,33 +57,33 @@ pub struct SharedStyleContext {
///The CSS error reporter for all CSS loaded in this layout thread
pub error_reporter: Box<ParseErrorReporter + Sync>,
/// Data needed to create the local style context from the shared one.
pub local_context_creation_data: Mutex<LocalStyleContextCreationInfo>,
/// Data needed to create the thread-local style context from the shared one.
pub local_context_creation_data: Mutex<ThreadLocalStyleContextCreationInfo>,
/// The current timer for transitions and animations. This is needed to test
/// them.
pub timer: Timer,
}
pub struct LocalStyleContext {
pub struct ThreadLocalStyleContext {
pub style_sharing_candidate_cache: RefCell<StyleSharingCandidateCache>,
/// A channel on which new animations that have been triggered by style
/// recalculation can be sent.
pub new_animations_sender: Sender<Animation>,
}
impl LocalStyleContext {
pub fn new(local_context_creation_data: &LocalStyleContextCreationInfo) -> Self {
LocalStyleContext {
impl ThreadLocalStyleContext {
pub fn new(local_context_creation_data: &ThreadLocalStyleContextCreationInfo) -> Self {
ThreadLocalStyleContext {
style_sharing_candidate_cache: RefCell::new(StyleSharingCandidateCache::new()),
new_animations_sender: local_context_creation_data.new_animations_sender.clone(),
}
}
}
pub trait StyleContext<'a> {
fn shared_context(&self) -> &'a SharedStyleContext;
fn local_context(&self) -> &LocalStyleContext;
pub struct StyleContext<'a> {
pub shared: &'a SharedStyleContext,
pub thread_local: &'a ThreadLocalStyleContext,
}
/// Why we're doing reflow.

33
components/style/gecko/context.rs
View file

@ -2,20 +2,20 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use context::{LocalStyleContext, StyleContext, SharedStyleContext};
use context::{SharedStyleContext, ThreadLocalStyleContext};
use std::cell::RefCell;
use std::rc::Rc;
thread_local!(static LOCAL_CONTEXT_KEY: RefCell<Option<Rc<LocalStyleContext>>> = RefCell::new(None));
thread_local!(static LOCAL_CONTEXT_KEY: RefCell<Option<Rc<ThreadLocalStyleContext>>> = RefCell::new(None));
// Keep this implementation in sync with the one in components/layout/context.rs.
fn create_or_get_local_context(shared: &SharedStyleContext) -> Rc<LocalStyleContext> {
pub fn create_or_get_local_context(shared: &SharedStyleContext) -> Rc<ThreadLocalStyleContext> {
LOCAL_CONTEXT_KEY.with(|r| {
let mut r = r.borrow_mut();
if let Some(context) = r.clone() {
context
} else {
let context = Rc::new(LocalStyleContext::new(&shared.local_context_creation_data.lock().unwrap()));
let context = Rc::new(ThreadLocalStyleContext::new(&shared.local_context_creation_data.lock().unwrap()));
*r = Some(context.clone());
context
}
@ -25,28 +25,3 @@ fn create_or_get_local_context(shared: &SharedStyleContext) -> Rc<LocalStyleCont
pub fn clear_local_context() {
LOCAL_CONTEXT_KEY.with(|r| *r.borrow_mut() = None);
}
pub struct StandaloneStyleContext<'a> {
pub shared: &'a SharedStyleContext,
cached_local_context: Rc<LocalStyleContext>,
}
impl<'a> StandaloneStyleContext<'a> {
pub fn new(shared: &'a SharedStyleContext) -> Self {
let local_context = create_or_get_local_context(shared);
StandaloneStyleContext {
shared: shared,
cached_local_context: local_context,
}
}
}
impl<'a> StyleContext<'a> for StandaloneStyleContext<'a> {
fn shared_context(&self) -> &'a SharedStyleContext {
&self.shared
}
fn local_context(&self) -> &LocalStyleContext {
&self.cached_local_context
}
}

43
components/style/gecko/traversal.rs
View file

@ -3,35 +3,38 @@
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use atomic_refcell::AtomicRefCell;
use context::{LocalStyleContext, SharedStyleContext, StyleContext};
use context::{SharedStyleContext, StyleContext, ThreadLocalStyleContext};
use data::ElementData;
use dom::{NodeInfo, OpaqueNode, TNode};
use gecko::context::StandaloneStyleContext;
use dom::{NodeInfo, TNode};
use gecko::context::create_or_get_local_context;
use gecko::wrapper::{GeckoElement, GeckoNode};
use std::mem;
use traversal::{DomTraversalContext, PerLevelTraversalData, recalc_style_at};
use std::rc::Rc; use traversal::{DomTraversal, PerLevelTraversalData, recalc_style_at};
pub struct RecalcStyleOnly<'lc> {
context: StandaloneStyleContext<'lc>,
pub struct RecalcStyleOnly {
shared: SharedStyleContext,
}
impl<'lc, 'ln> DomTraversalContext<GeckoNode<'ln>> for RecalcStyleOnly<'lc> {
type SharedContext = SharedStyleContext;
#[allow(unsafe_code)]
fn new<'a>(shared: &'a Self::SharedContext, _root: OpaqueNode) -> Self {
// See the comment in RecalcStyleAndConstructFlows::new for an explanation of why this is
// necessary.
let shared_lc: &'lc Self::SharedContext = unsafe { mem::transmute(shared) };
impl RecalcStyleOnly {
pub fn new(shared: SharedStyleContext) -> Self {
RecalcStyleOnly {
context: StandaloneStyleContext::new(shared_lc),
shared: shared,
}
}
}
impl<'ln> DomTraversal<GeckoNode<'ln>> for RecalcStyleOnly {
type ThreadLocalContext = ThreadLocalStyleContext;
fn process_preorder(&self, node: GeckoNode<'ln>, traversal_data: &mut PerLevelTraversalData) {
if node.is_element() {
let el = node.as_element().unwrap();
let mut data = unsafe { el.ensure_data() }.borrow_mut();
recalc_style_at::<_, _, Self>(&self.context, traversal_data, el, &mut data);
let tlc = self.create_or_get_thread_local_context();
let context = StyleContext {
shared: &self.shared,
thread_local: &*tlc,
};
recalc_style_at(self, traversal_data, &context, el, &mut data);
}
}
@ -50,7 +53,11 @@ impl<'lc, 'ln> DomTraversalContext<GeckoNode<'ln>> for RecalcStyleOnly<'lc> {
element.clear_data()
}
fn local_context(&self) -> &LocalStyleContext {
self.context.local_context()
fn shared_context(&self) -> &SharedStyleContext {
&self.shared
}
fn create_or_get_thread_local_context(&self) -> Rc<ThreadLocalStyleContext> {
create_or_get_local_context(&self.shared)
}
}

62
components/style/matching.rs
View file

@ -391,16 +391,15 @@ trait PrivateMatchMethods: TElement {
///
/// Note that animations only apply to nodes or ::before or ::after
/// pseudo-elements.
fn cascade_node_pseudo_element<'a, Ctx>(&self,
context: &Ctx,
parent_style: Option<&Arc<ComputedValues>>,
old_style: Option<&Arc<ComputedValues>>,
rule_node: &StrongRuleNode,
possibly_expired_animations: &[PropertyAnimation],
booleans: CascadeBooleans)
-> Arc<ComputedValues>
where Ctx: StyleContext<'a> {
let shared_context = context.shared_context();
fn cascade_node_pseudo_element<'a>(&self,
context: &StyleContext,
parent_style: Option<&Arc<ComputedValues>>,
old_style: Option<&Arc<ComputedValues>>,
rule_node: &StrongRuleNode,
possibly_expired_animations: &[PropertyAnimation],
booleans: CascadeBooleans)
-> Arc<ComputedValues> {
let shared_context = context.shared;
let mut cascade_info = CascadeInfo::new();
let mut cascade_flags = CascadeFlags::empty();
if booleans.shareable {
@ -433,7 +432,7 @@ trait PrivateMatchMethods: TElement {
let mut this_style = Arc::new(this_style);
if booleans.animate {
let new_animations_sender = &context.local_context().new_animations_sender;
let new_animations_sender = &context.thread_local.new_animations_sender;
let this_opaque = self.as_node().opaque();
// Trigger any present animations if necessary.
animation::maybe_start_animations(&shared_context,
@ -509,26 +508,23 @@ trait PrivateMatchMethods: TElement {
}
}
fn compute_rule_node<'a, Ctx>(context: &Ctx,
applicable_declarations: &mut Vec<ApplicableDeclarationBlock>)
-> StrongRuleNode
where Ctx: StyleContext<'a>
fn compute_rule_node(context: &StyleContext,
applicable_declarations: &mut Vec<ApplicableDeclarationBlock>)
-> StrongRuleNode
{
let shared_context = context.shared_context();
let rules = applicable_declarations.drain(..).map(|d| (d.source, d.importance));
let rule_node = shared_context.stylist.rule_tree.insert_ordered_rules(rules);
let rule_node = context.shared.stylist.rule_tree.insert_ordered_rules(rules);
rule_node
}
impl<E: TElement> PrivateMatchMethods for E {}
pub trait MatchMethods : TElement {
fn match_element<'a, Ctx>(&self, context: &Ctx, parent_bf: Option<&BloomFilter>)
-> MatchResults
where Ctx: StyleContext<'a>
fn match_element(&self, context: &StyleContext, parent_bf: Option<&BloomFilter>)
-> MatchResults
{
let mut applicable_declarations: Vec<ApplicableDeclarationBlock> = Vec::with_capacity(16);
let stylist = &context.shared_context().stylist;
let stylist = &context.shared.stylist;
let style_attribute = self.style_attribute();
// Compute the primary rule node.
@ -721,14 +717,13 @@ pub trait MatchMethods : TElement {
}
}
unsafe fn cascade_node<'a, Ctx>(&self,
context: &Ctx,
mut data: &mut AtomicRefMut<ElementData>,
parent: Option<Self>,
primary_rule_node: StrongRuleNode,
pseudo_rule_nodes: PseudoRuleNodes,
primary_is_shareable: bool)
where Ctx: StyleContext<'a>
unsafe fn cascade_node(&self,
context: &StyleContext,
mut data: &mut AtomicRefMut<ElementData>,
parent: Option<Self>,
primary_rule_node: StrongRuleNode,
pseudo_rule_nodes: PseudoRuleNodes,
primary_is_shareable: bool)
{
// Get our parent's style.
let parent_data = parent.as_ref().map(|x| x.borrow_data().unwrap());
@ -753,7 +748,7 @@ pub trait MatchMethods : TElement {
Some(previous) => {
// Update animations before the cascade. This may modify the
// value of the old primary style.
self.update_animations_for_cascade(context.shared_context(),
self.update_animations_for_cascade(&context.shared,
&mut previous.primary.values,
&mut possibly_expired_animations);
(Some(&previous.primary.values), Some(&mut previous.pseudos))
@ -794,17 +789,16 @@ pub trait MatchMethods : TElement {
data.finish_styling(new_styles, damage);
}
fn compute_damage_and_cascade_pseudos<'a, Ctx>(
fn compute_damage_and_cascade_pseudos(
&self,
old_primary: Option<&Arc<ComputedValues>>,
mut old_pseudos: Option<&mut PseudoStyles>,
new_primary: &Arc<ComputedValues>,
new_pseudos: &mut PseudoStyles,
context: &Ctx,
context: &StyleContext,
mut pseudo_rule_nodes: PseudoRuleNodes,
possibly_expired_animations: &mut Vec<PropertyAnimation>)
-> RestyleDamage
where Ctx: StyleContext<'a>
{
// Here we optimise the case of the style changing but both the
// previous and the new styles having display: none. In this
@ -859,7 +853,7 @@ pub trait MatchMethods : TElement {
if let Some(ref mut old_pseudo_style) = maybe_old_pseudo_style {
// Update animations before the cascade. This may modify
// the value of old_pseudo_style.
self.update_animations_for_cascade(context.shared_context(),
self.update_animations_for_cascade(&context.shared,
&mut old_pseudo_style.values,
possibly_expired_animations);
}

54
components/style/parallel.rs
View file

@ -9,19 +9,20 @@
use dom::{OpaqueNode, TElement, TNode, UnsafeNode};
use rayon;
use servo_config::opts;
use std::borrow::Borrow;
use std::sync::atomic::Ordering;
use traversal::{DomTraversalContext, PerLevelTraversalData, PreTraverseToken};
use traversal::{DomTraversal, PerLevelTraversalData, PreTraverseToken};
use traversal::{STYLE_SHARING_CACHE_HITS, STYLE_SHARING_CACHE_MISSES};
pub const CHUNK_SIZE: usize = 64;
pub fn traverse_dom<N, C>(root: N::ConcreteElement,
pub fn traverse_dom<N, D>(traversal: &D,
root: N::ConcreteElement,
known_root_dom_depth: Option<usize>,
shared_context: &C::SharedContext,
token: PreTraverseToken,
queue: &rayon::ThreadPool)
where N: TNode,
C: DomTraversalContext<N>
D: DomTraversal<N>
{
if opts::get().style_sharing_stats {
STYLE_SHARING_CACHE_HITS.store(0, Ordering::SeqCst);
@ -32,7 +33,7 @@ pub fn traverse_dom<N, C>(root: N::ConcreteElement,
// in conjunction with bottom-up traversal. If we did, we'd need to put
// it on the context to make it available to the bottom-up phase.
let (nodes, depth) = if token.traverse_unstyled_children_only() {
debug_assert!(!C::needs_postorder_traversal());
debug_assert!(!D::needs_postorder_traversal());
let mut children = vec![];
for kid in root.as_node().children() {
if kid.as_element().map_or(false, |el| el.get_data().is_none()) {
@ -51,7 +52,7 @@ pub fn traverse_dom<N, C>(root: N::ConcreteElement,
let root = root.as_node().opaque();
queue.install(|| {
rayon::scope(|scope| {
traverse_nodes::<_, C>(nodes, root, data, scope, shared_context);
traverse_nodes(nodes, root, data, scope, traversal);
});
});
@ -68,16 +69,14 @@ pub fn traverse_dom<N, C>(root: N::ConcreteElement,
/// A parallel top-down DOM traversal.
#[inline(always)]
#[allow(unsafe_code)]
fn top_down_dom<'a, 'scope, N, C>(unsafe_nodes: &'a [UnsafeNode],
fn top_down_dom<'a, 'scope, N, D>(unsafe_nodes: &'a [UnsafeNode],
root: OpaqueNode,
mut data: PerLevelTraversalData,
scope: &'a rayon::Scope<'scope>,
shared_context: &'scope C::SharedContext)
traversal: &'scope D)
where N: TNode,
C: DomTraversalContext<N>,
D: DomTraversal<N>,
{
let context = C::new(shared_context, root);
let mut discovered_child_nodes = vec![];
for unsafe_node in unsafe_nodes {
// Get a real layout node.
@ -85,9 +84,9 @@ fn top_down_dom<'a, 'scope, N, C>(unsafe_nodes: &'a [UnsafeNode],
// Perform the appropriate traversal.
let mut children_to_process = 0isize;
context.process_preorder(node, &mut data);
traversal.process_preorder(node, &mut data);
if let Some(el) = node.as_element() {
C::traverse_children(el, |kid| {
D::traverse_children(el, |kid| {
children_to_process += 1;
discovered_child_nodes.push(kid.to_unsafe())
});
@ -95,10 +94,10 @@ fn top_down_dom<'a, 'scope, N, C>(unsafe_nodes: &'a [UnsafeNode],
// Reset the count of children if we need to do a bottom-up traversal
// after the top up.
if C::needs_postorder_traversal() {
if D::needs_postorder_traversal() {
if children_to_process == 0 {
// If there were no more children, start walking back up.
bottom_up_dom::<N, C>(root, *unsafe_node, shared_context)
bottom_up_dom(root, *unsafe_node, traversal)
} else {
// Otherwise record the number of children to process when the
// time comes.
@ -109,21 +108,22 @@ fn top_down_dom<'a, 'scope, N, C>(unsafe_nodes: &'a [UnsafeNode],
// NB: In parallel traversal mode we have to purge the LRU cache in order to
// be able to access it without races.
context.local_context().style_sharing_candidate_cache.borrow_mut().clear();
let tlc = traversal.create_or_get_thread_local_context();
(*tlc).borrow().style_sharing_candidate_cache.borrow_mut().clear();
if let Some(ref mut depth) = data.current_dom_depth {
*depth += 1;
}
traverse_nodes::<_, C>(discovered_child_nodes, root, data, scope, shared_context);
traverse_nodes(discovered_child_nodes, root, data, scope, traversal);
}
fn traverse_nodes<'a, 'scope, N, C>(nodes: Vec<UnsafeNode>, root: OpaqueNode,
fn traverse_nodes<'a, 'scope, N, D>(nodes: Vec<UnsafeNode>, root: OpaqueNode,
data: PerLevelTraversalData,
scope: &'a rayon::Scope<'scope>,
shared_context: &'scope C::SharedContext)
traversal: &'scope D)
where N: TNode,
C: DomTraversalContext<N>,
D: DomTraversal<N>,
{
if nodes.is_empty() {
return;
@ -133,7 +133,7 @@ fn traverse_nodes<'a, 'scope, N, C>(nodes: Vec<UnsafeNode>, root: OpaqueNode,
// we're only pushing one work unit.
if nodes.len() <= CHUNK_SIZE {
let nodes = nodes.into_boxed_slice();
top_down_dom::<N, C>(&nodes, root, data, scope, shared_context);
top_down_dom(&nodes, root, data, scope, traversal);
return;
}
@ -143,7 +143,7 @@ fn traverse_nodes<'a, 'scope, N, C>(nodes: Vec<UnsafeNode>, root: OpaqueNode,
let data = data.clone();
scope.spawn(move |scope| {
let nodes = nodes;
top_down_dom::<N, C>(&nodes, root, data, scope, shared_context)
top_down_dom(&nodes, root, data, scope, traversal)
})
}
}
@ -160,19 +160,17 @@ fn traverse_nodes<'a, 'scope, N, C>(nodes: Vec<UnsafeNode>, root: OpaqueNode,
/// The only communication between siblings is that they both
/// fetch-and-subtract the parent's children count.
#[allow(unsafe_code)]
fn bottom_up_dom<N, C>(root: OpaqueNode,
fn bottom_up_dom<N, D>(root: OpaqueNode,
unsafe_node: UnsafeNode,
shared_context: &C::SharedContext)
traversal: &D)
where N: TNode,
C: DomTraversalContext<N>
D: DomTraversal<N>
{
let context = C::new(shared_context, root);
// Get a real layout node.
let mut node = unsafe { N::from_unsafe(&unsafe_node) };
loop {
// Perform the appropriate operation.
context.process_postorder(node);
traversal.process_postorder(node);
if node.opaque() == root {
break;

29
components/style/sequential.rs
View file

@ -5,53 +5,54 @@
//! Implements sequential traversal over the DOM tree.
use dom::{TElement, TNode};
use traversal::{DomTraversalContext, PerLevelTraversalData, PreTraverseToken};
use std::borrow::Borrow;
use traversal::{DomTraversal, PerLevelTraversalData, PreTraverseToken};
pub fn traverse_dom<N, C>(root: N::ConcreteElement,
shared: &C::SharedContext,
pub fn traverse_dom<N, D>(traversal: &D,
root: N::ConcreteElement,
token: PreTraverseToken)
where N: TNode,
C: DomTraversalContext<N>
D: DomTraversal<N>
{
debug_assert!(token.should_traverse());
fn doit<'a, N, C>(context: &'a C, node: N, data: &mut PerLevelTraversalData)
fn doit<N, D>(traversal: &D, node: N, data: &mut PerLevelTraversalData)
where N: TNode,
C: DomTraversalContext<N>
D: DomTraversal<N>
{
context.process_preorder(node, data);
traversal.process_preorder(node, data);
if let Some(el) = node.as_element() {
if let Some(ref mut depth) = data.current_dom_depth {
*depth += 1;
}
C::traverse_children(el, |kid| doit::<N, C>(context, kid, data));
D::traverse_children(el, |kid| doit(traversal, kid, data));
if let Some(ref mut depth) = data.current_dom_depth {
*depth -= 1;
}
}
if C::needs_postorder_traversal() {
context.process_postorder(node);
if D::needs_postorder_traversal() {
traversal.process_postorder(node);
}
}
let mut data = PerLevelTraversalData {
current_dom_depth: None,
};
let context = C::new(shared, root.as_node().opaque());
if token.traverse_unstyled_children_only() {
for kid in root.as_node().children() {
if kid.as_element().map_or(false, |el| el.get_data().is_none()) {
doit::<N, C>(&context, kid, &mut data);
doit(traversal, kid, &mut data);
}
}
} else {
doit::<N, C>(&context, root.as_node(), &mut data);
doit(traversal, root.as_node(), &mut data);
}
// Clear the local LRU cache since we store stateful elements inside.
context.local_context().style_sharing_candidate_cache.borrow_mut().clear();
let tlc = traversal.create_or_get_thread_local_context();
(*tlc).borrow().style_sharing_candidate_cache.borrow_mut().clear();
}

77
components/style/traversal.rs
View file

@ -6,7 +6,7 @@
use atomic_refcell::{AtomicRefCell, AtomicRefMut};
use bloom::StyleBloom;
use context::{LocalStyleContext, SharedStyleContext, StyleContext};
use context::{SharedStyleContext, StyleContext, ThreadLocalStyleContext};
use data::{ElementData, StoredRestyleHint};
use dom::{OpaqueNode, TElement, TNode};
use matching::{MatchMethods, StyleSharingResult};
@ -18,6 +18,7 @@ use servo_config::opts;
use std::borrow::Borrow;
use std::cell::RefCell;
use std::mem;
use std::rc::Rc;
use std::sync::atomic::{AtomicUsize, ATOMIC_USIZE_INIT, Ordering};
use stylist::Stylist;
@ -64,9 +65,8 @@ pub fn put_thread_local_bloom_filter(bf: StyleBloom) {
///
/// This is mostly useful for sequential traversal, where the element will
/// always be the last one.
pub fn remove_from_bloom_filter<'a, E, C>(context: &C, root: OpaqueNode, element: E)
where E: TElement,
C: StyleContext<'a>
pub fn remove_from_bloom_filter<E: TElement>(context: &SharedStyleContext,
root: OpaqueNode, element: E)
{
trace!("[{}] remove_from_bloom_filter", ::tid::tid());
@ -78,7 +78,7 @@ pub fn remove_from_bloom_filter<'a, E, C>(context: &C, root: OpaqueNode, element
});
if let Some(mut bf) = bf {
if context.shared_context().generation == bf.generation() {
if context.generation == bf.generation() {
bf.maybe_pop(element);
// If we're the root of the reflow, just get rid of the bloom
@ -127,10 +127,8 @@ impl LogBehavior {
fn allow(&self) -> bool { match *self { MayLog => true, DontLog => false, } }
}
pub trait DomTraversalContext<N: TNode> {
type SharedContext: Sync + 'static + Borrow<SharedStyleContext>;
fn new<'a>(&'a Self::SharedContext, OpaqueNode) -> Self;
pub trait DomTraversal<N: TNode> : Sync {
type ThreadLocalContext: Borrow<ThreadLocalStyleContext>;
/// Process `node` on the way down, before its children have been processed.
fn process_preorder(&self, node: N, data: &mut PerLevelTraversalData);
@ -321,7 +319,9 @@ pub trait DomTraversalContext<N: TNode> {
/// children of |element|.
unsafe fn clear_element_data(element: &N::ConcreteElement);
fn local_context(&self) -> &LocalStyleContext;
fn shared_context(&self) -> &SharedStyleContext;
fn create_or_get_thread_local_context(&self) -> Rc<Self::ThreadLocalContext>;
}
/// Determines the amount of relations where we're going to share style.
@ -337,11 +337,9 @@ pub fn relations_are_shareable(relations: &StyleRelations) -> bool {
/// Handles lazy resolution of style in display:none subtrees. See the comment
/// at the callsite in query.rs.
pub fn style_element_in_display_none_subtree<'a, E, C, F>(element: E,
init_data: &F,
context: &'a C) -> E
pub fn style_element_in_display_none_subtree<E, F>(context: &StyleContext,
element: E, init_data: &F) -> E
where E: TElement,
C: StyleContext<'a>,
F: Fn(E),
{
// Check the base case.
@ -354,7 +352,7 @@ pub fn style_element_in_display_none_subtree<'a, E, C, F>(element: E,
// Ensure the parent is styled.
let parent = element.parent_element().unwrap();
let display_none_root = style_element_in_display_none_subtree(parent, init_data, context);
let display_none_root = style_element_in_display_none_subtree(context, parent, init_data);
// Initialize our data.
init_data(element);
@ -376,13 +374,13 @@ pub fn style_element_in_display_none_subtree<'a, E, C, F>(element: E,
/// Calculates the style for a single node.
#[inline]
#[allow(unsafe_code)]
pub fn recalc_style_at<'a, E, C, D>(context: &'a C,
traversal_data: &mut PerLevelTraversalData,
element: E,
mut data: &mut AtomicRefMut<ElementData>)
pub fn recalc_style_at<E, D>(traversal: &D,
traversal_data: &mut PerLevelTraversalData,
context: &StyleContext,
element: E,
mut data: &mut AtomicRefMut<ElementData>)
where E: TElement,
C: StyleContext<'a>,
D: DomTraversalContext<E::ConcreteNode>
D: DomTraversal<E::ConcreteNode>
{
debug_assert!(data.as_restyle().map_or(true, |r| r.snapshot.is_none()),
"Snapshots should be expanded by the caller");
@ -395,7 +393,7 @@ pub fn recalc_style_at<'a, E, C, D>(context: &'a C,
// Compute style for this element if necessary.
if compute_self {
inherited_style_changed = compute_style::<_, _, D>(context, &mut data, traversal_data, element);
inherited_style_changed = compute_style(traversal, traversal_data, context, element, &mut data);
}
// Now that matching and cascading is done, clear the bits corresponding to
@ -414,7 +412,7 @@ pub fn recalc_style_at<'a, E, C, D>(context: &'a C,
// Preprocess children, propagating restyle hints and handling sibling relationships.
if D::should_traverse_children(element, &data, DontLog) &&
(element.has_dirty_descendants() || !propagated_hint.is_empty() || inherited_style_changed) {
preprocess_children::<_, _, D>(context, element, propagated_hint, inherited_style_changed);
preprocess_children(traversal, element, propagated_hint, inherited_style_changed);
}
}
@ -423,15 +421,15 @@ pub fn recalc_style_at<'a, E, C, D>(context: &'a C,
//
// FIXME(bholley): This should differentiate between matching and cascading,
// since we have separate bits for each now.
fn compute_style<'a, E, C, D>(context: &'a C,
mut data: &mut AtomicRefMut<ElementData>,
traversal_data: &mut PerLevelTraversalData,
element: E) -> bool
fn compute_style<E, D>(_traversal: &D,
traversal_data: &mut PerLevelTraversalData,
context: &StyleContext,
element: E,
mut data: &mut AtomicRefMut<ElementData>) -> bool
where E: TElement,
C: StyleContext<'a>,
D: DomTraversalContext<E::ConcreteNode>,
D: DomTraversal<E::ConcreteNode>,
{
let shared_context = context.shared_context();
let shared_context = context.shared;
let mut bf = take_thread_local_bloom_filter(shared_context);
// Ensure the bloom filter is up to date.
let dom_depth = bf.insert_parents_recovering(element,
@ -447,13 +445,13 @@ fn compute_style<'a, E, C, D>(context: &'a C,
bf.assert_complete(element);
// Check to see whether we can share a style with someone.
let style_sharing_candidate_cache =
&mut context.local_context().style_sharing_candidate_cache.borrow_mut();
let mut style_sharing_candidate_cache =
context.thread_local.style_sharing_candidate_cache.borrow_mut();
let sharing_result = if element.parent_element().is_none() {
StyleSharingResult::CannotShare
} else {
unsafe { element.share_style_if_possible(style_sharing_candidate_cache,
unsafe { element.share_style_if_possible(&mut style_sharing_candidate_cache,
shared_context, &mut data) }
};
@ -522,13 +520,12 @@ fn compute_style<'a, E, C, D>(context: &'a C,
inherited_styles_changed
}
fn preprocess_children<'a, E, C, D>(context: &'a C,
element: E,
mut propagated_hint: StoredRestyleHint,
parent_inherited_style_changed: bool)
fn preprocess_children<E, D>(traversal: &D,
element: E,
mut propagated_hint: StoredRestyleHint,
parent_inherited_style_changed: bool)
where E: TElement,
C: StyleContext<'a>,
D: DomTraversalContext<E::ConcreteNode>
D: DomTraversal<E::ConcreteNode>
{
// Loop over all the children.
for child in element.as_node().children() {
@ -554,7 +551,7 @@ fn preprocess_children<'a, E, C, D>(context: &'a C,
}
// Handle element snapshots.
let stylist = &context.shared_context().stylist;
let stylist = &traversal.shared_context().stylist;
let later_siblings = restyle_data.expand_snapshot(child, stylist);
if later_siblings {
propagated_hint.insert(&(RESTYLE_SELF | RESTYLE_DESCENDANTS).into());

31
ports/geckolib/glue.rs
View file

@ -16,11 +16,10 @@ use std::ptr;
use std::sync::{Arc, Mutex};
use style::arc_ptr_eq;
use style::atomic_refcell::AtomicRefMut;
use style::context::{LocalStyleContextCreationInfo, ReflowGoal, SharedStyleContext};
use style::context::{ThreadLocalStyleContextCreationInfo, ReflowGoal, SharedStyleContext, StyleContext};
use style::data::{ElementData, RestyleData};
use style::dom::{ShowSubtreeData, TElement, TNode};
use style::error_reporting::StdoutErrorReporter;
use style::gecko::context::StandaloneStyleContext;
use style::gecko::context::clear_local_context;
use style::gecko::data::{NUM_THREADS, PerDocumentStyleData, PerDocumentStyleDataImpl};
use style::gecko::restyle_damage::GeckoRestyleDamage;
@ -58,7 +57,7 @@ use style::string_cache::Atom;
use style::stylesheets::{CssRule, CssRules, Origin, Stylesheet, StyleRule};
use style::thread_state;
use style::timer::Timer;
use style::traversal::{recalc_style_at, DomTraversalContext, PerLevelTraversalData};
use style::traversal::{recalc_style_at, DomTraversal, PerLevelTraversalData};
use style_traits::ToCss;
use stylesheet_loader::StylesheetLoader;
@ -89,7 +88,7 @@ pub extern "C" fn Servo_Shutdown() -> () {
// Destroy our default computed values.
unsafe { ComputedValues::shutdown(); }
// In general, LocalStyleContexts will get destroyed when the worker thread
// In general, ThreadLocalStyleContexts will get destroyed when the worker thread
// is joined and the TLS is dropped. However, under some configurations we
// may do sequential style computation on the main thread, so we need to be
// sure to clear the main thread TLS entry as well.
@ -101,7 +100,7 @@ fn create_shared_context(mut per_doc_data: &mut AtomicRefMut<PerDocumentStyleDat
per_doc_data.flush_stylesheets();
let local_context_data =
LocalStyleContextCreationInfo::new(per_doc_data.new_animations_sender.clone());
ThreadLocalStyleContextCreationInfo::new(per_doc_data.new_animations_sender.clone());
SharedStyleContext {
// FIXME (bug 1303229): Use the actual viewport size here
@ -150,14 +149,14 @@ fn traverse_subtree(element: GeckoElement, raw_data: RawServoStyleSetBorrowed,
debug!("{:?}", ShowSubtreeData(element.as_node()));
let shared_style_context = create_shared_context(&mut per_doc_data);
let traversal = RecalcStyleOnly::new(shared_style_context);
let known_depth = None;
if per_doc_data.num_threads == 1 || per_doc_data.work_queue.is_none() {
sequential::traverse_dom::<_, RecalcStyleOnly>(element, &shared_style_context, token);
sequential::traverse_dom(&traversal, element, token);
} else {
parallel::traverse_dom::<_, RecalcStyleOnly>(element, known_depth,
&shared_style_context, token,
per_doc_data.work_queue.as_mut().unwrap());
parallel::traverse_dom(&traversal, element, known_depth, token,
per_doc_data.work_queue.as_mut().unwrap());
}
}
@ -812,8 +811,6 @@ pub extern "C" fn Servo_ResolveStyle(element: RawGeckoElementBorrowed,
consume: structs::ConsumeStyleBehavior,
compute: structs::LazyComputeBehavior) -> ServoComputedValuesStrong
{
use style::context::StyleContext;
let element = GeckoElement(element);
debug!("Servo_ResolveStyle: {:?}, consume={:?}, compute={:?}", element, consume, compute);
@ -832,16 +829,22 @@ pub extern "C" fn Servo_ResolveStyle(element: RawGeckoElementBorrowed,
let mut per_doc_data = PerDocumentStyleData::from_ffi(raw_data).borrow_mut();
let shared_style_context = create_shared_context(&mut per_doc_data);
let context = StandaloneStyleContext::new(&shared_style_context);
let traversal = RecalcStyleOnly::new(shared_style_context);
let tlc = traversal.create_or_get_thread_local_context();
let mut traversal_data = PerLevelTraversalData {
current_dom_depth: None,
};
recalc_style_at::<_, _, RecalcStyleOnly>(&context, &mut traversal_data, element, &mut data);
let context = StyleContext {
shared: traversal.shared_context(),
thread_local: &*tlc,
};
recalc_style_at(&traversal, &mut traversal_data, &context, element, &mut data);
// We don't want to keep any cached style around after this one-off style resolution.
context.local_context().style_sharing_candidate_cache.borrow_mut().clear();
tlc.style_sharing_candidate_cache.borrow_mut().clear();
// The element was either unstyled or needed restyle. If it was unstyled, it may have
// additional unstyled children that subsequent traversals won't find now that the style