forked from mirrors/gecko-dev
bd6bcb98f1
This fixes issue #3630 A short summary of the changes: * Use atomic generation id to cancel inflight requests * Handles nested calls to abort, open, send inside handlers * Adds XHRReleaseMsg to delay freeing XHR object till all inflight events are processed * Handles both timeout, errors and abort/open in a symmetric fashion i.e All inflight events will be cancelled for timeouts, aborts, errors and on calling open. * Change the ErroredMsg enum to be more symmetric with the returned Error enum I noticed a few possible changes that could make the code for fetch task simpler: * We can remove the additional timer task and let the fetch task manage its own timer (or maybe the resource loader can do this.) * The CORS related steps could also be moved into the resource loader. * Right now upload events are not support. This requires some support from resource loader. Source-Repo: https://github.com/servo/servo Source-Revision: 4e24e4d8e92528a5a6f7bb571c6557b5bca11ea9
1116 lines
47 KiB
Rust
1116 lines
47 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! The script task is the task that owns the DOM in memory, runs JavaScript, and spawns parsing
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//! and layout tasks.
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use dom::bindings::cell::DOMRefCell;
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use dom::bindings::codegen::Bindings::DocumentBinding::{DocumentMethods, DocumentReadyStateValues};
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use dom::bindings::codegen::Bindings::DOMRectBinding::DOMRectMethods;
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use dom::bindings::codegen::Bindings::ElementBinding::ElementMethods;
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use dom::bindings::codegen::Bindings::EventTargetBinding::EventTargetMethods;
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use dom::bindings::codegen::InheritTypes::{EventTargetCast, NodeCast, EventCast, ElementCast};
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use dom::bindings::conversions;
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use dom::bindings::conversions::{FromJSValConvertible, Empty};
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use dom::bindings::global;
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use dom::bindings::js::{JS, JSRef, RootCollection, Temporary, OptionalRootable};
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use dom::bindings::trace::JSTraceable;
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use dom::bindings::utils::{wrap_for_same_compartment, pre_wrap};
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use dom::document::{Document, HTMLDocument, DocumentHelpers, FromParser};
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use dom::element::{Element, HTMLButtonElementTypeId, HTMLInputElementTypeId};
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use dom::element::{HTMLSelectElementTypeId, HTMLTextAreaElementTypeId, HTMLOptionElementTypeId};
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use dom::event::{Event, Bubbles, DoesNotBubble, Cancelable, NotCancelable};
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use dom::uievent::UIEvent;
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use dom::eventtarget::{EventTarget, EventTargetHelpers};
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use dom::node;
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use dom::node::{ElementNodeTypeId, Node, NodeHelpers};
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use dom::window::{Window, WindowHelpers};
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use dom::worker::{Worker, TrustedWorkerAddress};
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use dom::xmlhttprequest::{TrustedXHRAddress, XMLHttpRequest, XHRProgress};
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use parse::html::{InputString, InputUrl, parse_html};
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use layout_interface::{ScriptLayoutChan, LayoutChan, NoQuery, ReflowForDisplay};
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use layout_interface;
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use page::{Page, IterablePage, Frame};
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use timers::TimerId;
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use devtools_traits;
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use devtools_traits::{DevtoolsControlChan, DevtoolsControlPort, NewGlobal, NodeInfo, GetRootNode};
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use devtools_traits::{DevtoolScriptControlMsg, EvaluateJS, EvaluateJSReply, GetDocumentElement};
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use devtools_traits::{GetChildren, GetLayout};
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use script_traits::{CompositorEvent, ResizeEvent, ReflowEvent, ClickEvent, MouseDownEvent};
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use script_traits::{MouseMoveEvent, MouseUpEvent, ConstellationControlMsg, ScriptTaskFactory};
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use script_traits::{ResizeMsg, AttachLayoutMsg, LoadMsg, SendEventMsg, ResizeInactiveMsg};
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use script_traits::{ExitPipelineMsg, NewLayoutInfo, OpaqueScriptLayoutChannel, ScriptControlChan};
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use script_traits::ReflowCompleteMsg;
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use servo_msg::compositor_msg::{FinishedLoading, LayerId, Loading};
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use servo_msg::compositor_msg::{ScriptListener};
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use servo_msg::constellation_msg::{ConstellationChan, LoadCompleteMsg, LoadUrlMsg, NavigationDirection};
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use servo_msg::constellation_msg::{LoadData, PipelineId, Failure, FailureMsg, WindowSizeData};
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use servo_msg::constellation_msg;
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use servo_net::image_cache_task::ImageCacheTask;
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use servo_net::resource_task::ResourceTask;
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use servo_util::geometry::to_frac_px;
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use servo_util::smallvec::{SmallVec1, SmallVec};
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use servo_util::task::spawn_named_with_send_on_failure;
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use servo_util::task_state;
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use geom::point::Point2D;
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use js::jsapi::{JS_SetWrapObjectCallbacks, JS_SetGCZeal, JS_DEFAULT_ZEAL_FREQ, JS_GC};
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use js::jsapi::{JSContext, JSRuntime, JSTracer};
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use js::jsapi::{JS_SetGCParameter, JSGC_MAX_BYTES};
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use js::jsapi::{JS_SetGCCallback, JSGCStatus, JSGC_BEGIN, JSGC_END};
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use js::rust::{Cx, RtUtils};
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use js;
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use url::Url;
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use libc::size_t;
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use std::any::{Any, AnyRefExt};
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use std::collections::HashSet;
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use std::comm::{channel, Sender, Receiver, Select};
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use std::mem::replace;
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use std::rc::Rc;
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use std::u32;
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local_data_key!(pub StackRoots: *const RootCollection)
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pub enum TimerSource {
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FromWindow(PipelineId),
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FromWorker
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}
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/// Messages used to control script event loops, such as ScriptTask and
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/// DedicatedWorkerGlobalScope.
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pub enum ScriptMsg {
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/// Acts on a fragment URL load on the specified pipeline (only dispatched
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/// to ScriptTask).
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TriggerFragmentMsg(PipelineId, Url),
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/// Begins a content-initiated load on the specified pipeline (only
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/// dispatched to ScriptTask).
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TriggerLoadMsg(PipelineId, LoadData),
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/// Instructs the script task to send a navigate message to
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/// the constellation (only dispatched to ScriptTask).
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NavigateMsg(NavigationDirection),
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/// Fires a JavaScript timeout
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/// TimerSource must be FromWindow when dispatched to ScriptTask and
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/// must be FromWorker when dispatched to a DedicatedGlobalWorkerScope
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FireTimerMsg(TimerSource, TimerId),
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/// Notifies the script that a window associated with a particular pipeline
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/// should be closed (only dispatched to ScriptTask).
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ExitWindowMsg(PipelineId),
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/// Notifies the script of progress on a fetch (dispatched to all tasks).
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XHRProgressMsg(TrustedXHRAddress, XHRProgress),
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/// Releases one reference to the XHR object (dispatched to all tasks).
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XHRReleaseMsg(TrustedXHRAddress),
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/// Message sent through Worker.postMessage (only dispatched to
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/// DedicatedWorkerGlobalScope).
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DOMMessage(*mut u64, size_t),
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/// Posts a message to the Worker object (dispatched to all tasks).
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WorkerPostMessage(TrustedWorkerAddress, *mut u64, size_t),
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/// Releases one reference to the Worker object (dispatched to all tasks).
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WorkerRelease(TrustedWorkerAddress),
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}
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/// Encapsulates internal communication within the script task.
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#[deriving(Clone)]
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pub struct ScriptChan(pub Sender<ScriptMsg>);
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no_jsmanaged_fields!(ScriptChan)
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impl ScriptChan {
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/// Creates a new script chan.
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pub fn new() -> (Receiver<ScriptMsg>, ScriptChan) {
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let (chan, port) = channel();
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(port, ScriptChan(chan))
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}
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}
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pub struct StackRootTLS;
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impl StackRootTLS {
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pub fn new(roots: &RootCollection) -> StackRootTLS {
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StackRoots.replace(Some(roots as *const RootCollection));
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StackRootTLS
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}
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}
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impl Drop for StackRootTLS {
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fn drop(&mut self) {
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let _ = StackRoots.replace(None);
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}
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}
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/// Information for an entire page. Pages are top-level browsing contexts and can contain multiple
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/// frames.
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///
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/// FIXME: Rename to `Page`, following WebKit?
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pub struct ScriptTask {
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/// A handle to the information pertaining to page layout
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page: DOMRefCell<Rc<Page>>,
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/// A handle to the image cache task.
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image_cache_task: ImageCacheTask,
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/// A handle to the resource task.
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resource_task: ResourceTask,
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/// The port on which the script task receives messages (load URL, exit, etc.)
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port: Receiver<ScriptMsg>,
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/// A channel to hand out to script task-based entities that need to be able to enqueue
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/// events in the event queue.
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chan: ScriptChan,
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/// A channel to hand out to tasks that need to respond to a message from the script task.
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control_chan: ScriptControlChan,
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/// The port on which the constellation and layout tasks can communicate with the
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/// script task.
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control_port: Receiver<ConstellationControlMsg>,
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/// For communicating load url messages to the constellation
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constellation_chan: ConstellationChan,
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/// A handle to the compositor for communicating ready state messages.
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compositor: Box<ScriptListener+'static>,
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/// For providing instructions to an optional devtools server.
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devtools_chan: Option<DevtoolsControlChan>,
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/// For receiving commands from an optional devtools server. Will be ignored if
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/// no such server exists.
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devtools_port: DevtoolsControlPort,
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/// The JavaScript runtime.
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js_runtime: js::rust::rt,
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/// The JSContext.
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js_context: DOMRefCell<Option<Rc<Cx>>>,
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mouse_over_targets: DOMRefCell<Option<Vec<JS<Node>>>>
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}
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/// In the event of task failure, all data on the stack runs its destructor. However, there
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/// are no reachable, owning pointers to the DOM memory, so it never gets freed by default
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/// when the script task fails. The ScriptMemoryFailsafe uses the destructor bomb pattern
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/// to forcibly tear down the JS compartments for pages associated with the failing ScriptTask.
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struct ScriptMemoryFailsafe<'a> {
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owner: Option<&'a ScriptTask>,
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}
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impl<'a> ScriptMemoryFailsafe<'a> {
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fn neuter(&mut self) {
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self.owner = None;
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}
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fn new(owner: &'a ScriptTask) -> ScriptMemoryFailsafe<'a> {
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ScriptMemoryFailsafe {
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owner: Some(owner),
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}
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}
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}
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#[unsafe_destructor]
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impl<'a> Drop for ScriptMemoryFailsafe<'a> {
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fn drop(&mut self) {
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match self.owner {
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Some(owner) => {
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let mut page = owner.page.borrow_mut();
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for page in page.iter() {
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*page.mut_js_info() = None;
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}
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*owner.js_context.borrow_mut() = None;
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}
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None => (),
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}
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}
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}
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trait PrivateScriptTaskHelpers {
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fn click_event_filter_by_disabled_state(&self) -> bool;
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}
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impl<'a> PrivateScriptTaskHelpers for JSRef<'a, Node> {
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fn click_event_filter_by_disabled_state(&self) -> bool {
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match self.type_id() {
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ElementNodeTypeId(HTMLButtonElementTypeId) |
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ElementNodeTypeId(HTMLInputElementTypeId) |
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// ElementNodeTypeId(HTMLKeygenElementTypeId) |
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ElementNodeTypeId(HTMLOptionElementTypeId) |
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ElementNodeTypeId(HTMLSelectElementTypeId) |
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ElementNodeTypeId(HTMLTextAreaElementTypeId) if self.get_disabled_state() => true,
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_ => false
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}
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}
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}
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impl ScriptTaskFactory for ScriptTask {
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fn create_layout_channel(_phantom: Option<&mut ScriptTask>) -> OpaqueScriptLayoutChannel {
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let (chan, port) = channel();
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ScriptLayoutChan::new(chan, port)
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}
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fn clone_layout_channel(_phantom: Option<&mut ScriptTask>, pair: &OpaqueScriptLayoutChannel) -> Box<Any+Send> {
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box pair.sender() as Box<Any+Send>
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}
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fn create<C:ScriptListener + Send + 'static>(
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_phantom: Option<&mut ScriptTask>,
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id: PipelineId,
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compositor: Box<C>,
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layout_chan: &OpaqueScriptLayoutChannel,
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control_chan: ScriptControlChan,
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control_port: Receiver<ConstellationControlMsg>,
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constellation_chan: ConstellationChan,
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failure_msg: Failure,
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resource_task: ResourceTask,
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image_cache_task: ImageCacheTask,
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devtools_chan: Option<DevtoolsControlChan>,
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window_size: WindowSizeData) {
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let ConstellationChan(const_chan) = constellation_chan.clone();
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let (script_chan, script_port) = channel();
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let layout_chan = LayoutChan(layout_chan.sender());
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spawn_named_with_send_on_failure("ScriptTask", task_state::Script, proc() {
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let script_task = ScriptTask::new(id,
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compositor as Box<ScriptListener>,
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layout_chan,
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script_port,
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ScriptChan(script_chan),
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control_chan,
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control_port,
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constellation_chan,
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resource_task,
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image_cache_task,
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devtools_chan,
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window_size);
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let mut failsafe = ScriptMemoryFailsafe::new(&script_task);
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script_task.start();
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// This must always be the very last operation performed before the task completes
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failsafe.neuter();
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}, FailureMsg(failure_msg), const_chan, false);
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}
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}
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unsafe extern "C" fn debug_gc_callback(rt: *mut JSRuntime, status: JSGCStatus) {
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js::rust::gc_callback(rt, status);
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match status {
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JSGC_BEGIN => task_state::enter(task_state::InGC),
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JSGC_END => task_state::exit(task_state::InGC),
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_ => (),
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}
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}
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impl ScriptTask {
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/// Creates a new script task.
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pub fn new(id: PipelineId,
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compositor: Box<ScriptListener+'static>,
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layout_chan: LayoutChan,
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port: Receiver<ScriptMsg>,
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chan: ScriptChan,
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control_chan: ScriptControlChan,
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control_port: Receiver<ConstellationControlMsg>,
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constellation_chan: ConstellationChan,
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resource_task: ResourceTask,
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img_cache_task: ImageCacheTask,
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devtools_chan: Option<DevtoolsControlChan>,
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window_size: WindowSizeData)
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-> ScriptTask {
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let (js_runtime, js_context) = ScriptTask::new_rt_and_cx();
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unsafe {
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// JS_SetWrapObjectCallbacks clobbers the existing wrap callback,
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// and JSCompartment::wrap crashes if that happens. The only way
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// to retrieve the default callback is as the result of
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// JS_SetWrapObjectCallbacks, which is why we call it twice.
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let callback = JS_SetWrapObjectCallbacks((*js_runtime).ptr,
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None,
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Some(wrap_for_same_compartment),
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None);
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JS_SetWrapObjectCallbacks((*js_runtime).ptr,
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callback,
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Some(wrap_for_same_compartment),
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Some(pre_wrap));
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}
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let page = Page::new(id, None, layout_chan, window_size,
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resource_task.clone(),
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constellation_chan.clone(),
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js_context.clone());
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// Notify devtools that a new script global exists.
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//FIXME: Move this into handle_load after we create a window instead.
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let (devtools_sender, devtools_receiver) = channel();
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devtools_chan.as_ref().map(|chan| {
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chan.send(NewGlobal(id, devtools_sender.clone()));
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});
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ScriptTask {
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page: DOMRefCell::new(Rc::new(page)),
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image_cache_task: img_cache_task,
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resource_task: resource_task,
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port: port,
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chan: chan,
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control_chan: control_chan,
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control_port: control_port,
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constellation_chan: constellation_chan,
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compositor: compositor,
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devtools_chan: devtools_chan,
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devtools_port: devtools_receiver,
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js_runtime: js_runtime,
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js_context: DOMRefCell::new(Some(js_context)),
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mouse_over_targets: DOMRefCell::new(None)
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}
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}
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pub fn new_rt_and_cx() -> (js::rust::rt, Rc<Cx>) {
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let js_runtime = js::rust::rt();
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assert!({
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let ptr: *mut JSRuntime = (*js_runtime).ptr;
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ptr.is_not_null()
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});
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// Unconstrain the runtime's threshold on nominal heap size, to avoid
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// triggering GC too often if operating continuously near an arbitrary
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// finite threshold. This leaves the maximum-JS_malloc-bytes threshold
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// still in effect to cause periodical, and we hope hygienic,
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// last-ditch GCs from within the GC's allocator.
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unsafe {
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JS_SetGCParameter(js_runtime.ptr, JSGC_MAX_BYTES, u32::MAX);
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}
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let js_context = js_runtime.cx();
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assert!({
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let ptr: *mut JSContext = (*js_context).ptr;
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ptr.is_not_null()
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});
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js_context.set_default_options_and_version();
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js_context.set_logging_error_reporter();
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unsafe {
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JS_SetGCZeal((*js_context).ptr, 0, JS_DEFAULT_ZEAL_FREQ);
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}
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// Needed for debug assertions about whether GC is running.
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if !cfg!(ndebug) {
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unsafe {
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JS_SetGCCallback(js_runtime.ptr, Some(debug_gc_callback));
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}
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}
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(js_runtime, js_context)
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}
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pub fn get_cx(&self) -> *mut JSContext {
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(**self.js_context.borrow().as_ref().unwrap()).ptr
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}
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/// Starts the script task. After calling this method, the script task will loop receiving
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/// messages on its port.
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pub fn start(&self) {
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while self.handle_msgs() {
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// Go on...
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}
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}
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/// Handle incoming control messages.
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fn handle_msgs(&self) -> bool {
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let roots = RootCollection::new();
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let _stack_roots_tls = StackRootTLS::new(&roots);
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// Handle pending resize events.
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// Gather them first to avoid a double mut borrow on self.
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let mut resizes = vec!();
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{
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let mut page = self.page.borrow_mut();
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for page in page.iter() {
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// Only process a resize if layout is idle.
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let layout_join_port = page.layout_join_port.borrow();
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if layout_join_port.is_none() {
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let mut resize_event = page.resize_event.get();
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match resize_event.take() {
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Some(size) => resizes.push((page.id, size)),
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None => ()
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}
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page.resize_event.set(None);
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}
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}
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}
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for (id, size) in resizes.into_iter() {
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self.handle_event(id, ResizeEvent(size));
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}
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enum MixedMessage {
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FromConstellation(ConstellationControlMsg),
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FromScript(ScriptMsg),
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FromDevtools(DevtoolScriptControlMsg),
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}
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// Store new resizes, and gather all other events.
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let mut sequential = vec!();
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|
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// Receive at least one message so we don't spinloop.
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let mut event = {
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let sel = Select::new();
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let mut port1 = sel.handle(&self.port);
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let mut port2 = sel.handle(&self.control_port);
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let mut port3 = sel.handle(&self.devtools_port);
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unsafe {
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port1.add();
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port2.add();
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if self.devtools_chan.is_some() {
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port3.add();
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}
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}
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let ret = sel.wait();
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if ret == port1.id() {
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FromScript(self.port.recv())
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} else if ret == port2.id() {
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FromConstellation(self.control_port.recv())
|
|
} else if ret == port3.id() {
|
|
FromDevtools(self.devtools_port.recv())
|
|
} else {
|
|
fail!("unexpected select result")
|
|
}
|
|
};
|
|
|
|
let mut needs_reflow = HashSet::new();
|
|
|
|
// Squash any pending resize and reflow events in the queue.
|
|
loop {
|
|
match event {
|
|
// This has to be handled before the ResizeMsg below,
|
|
// otherwise the page may not have been added to the
|
|
// child list yet, causing the find() to fail.
|
|
FromConstellation(AttachLayoutMsg(new_layout_info)) => {
|
|
self.handle_new_layout(new_layout_info);
|
|
}
|
|
FromConstellation(ResizeMsg(id, size)) => {
|
|
let mut page = self.page.borrow_mut();
|
|
let page = page.find(id).expect("resize sent to nonexistent pipeline");
|
|
page.resize_event.set(Some(size));
|
|
}
|
|
FromConstellation(SendEventMsg(id, ReflowEvent(node_addresses))) => {
|
|
let mut page = self.page.borrow_mut();
|
|
let inner_page = page.find(id).expect("Reflow sent to nonexistent pipeline");
|
|
let mut pending = inner_page.pending_dirty_nodes.borrow_mut();
|
|
pending.push_all_move(node_addresses);
|
|
needs_reflow.insert(id);
|
|
}
|
|
_ => {
|
|
sequential.push(event);
|
|
}
|
|
}
|
|
|
|
// If any of our input sources has an event pending, we'll perform another iteration
|
|
// and check for more resize events. If there are no events pending, we'll move
|
|
// on and execute the sequential non-resize events we've seen.
|
|
match self.control_port.try_recv() {
|
|
Err(_) => match self.port.try_recv() {
|
|
Err(_) => match self.devtools_port.try_recv() {
|
|
Err(_) => break,
|
|
Ok(ev) => event = FromDevtools(ev),
|
|
},
|
|
Ok(ev) => event = FromScript(ev),
|
|
},
|
|
Ok(ev) => event = FromConstellation(ev),
|
|
}
|
|
}
|
|
|
|
// Process the gathered events.
|
|
for msg in sequential.into_iter() {
|
|
match msg {
|
|
// TODO(tkuehn) need to handle auxiliary layouts for iframes
|
|
FromConstellation(AttachLayoutMsg(_)) => fail!("should have handled AttachLayoutMsg already"),
|
|
FromConstellation(LoadMsg(id, load_data)) => self.load(id, load_data),
|
|
FromScript(TriggerLoadMsg(id, load_data)) => self.trigger_load(id, load_data),
|
|
FromScript(TriggerFragmentMsg(id, url)) => self.trigger_fragment(id, url),
|
|
FromConstellation(SendEventMsg(id, event)) => self.handle_event(id, event),
|
|
FromScript(FireTimerMsg(FromWindow(id), timer_id)) => self.handle_fire_timer_msg(id, timer_id),
|
|
FromScript(FireTimerMsg(FromWorker, _)) => fail!("Worker timeouts must not be sent to script task"),
|
|
FromScript(NavigateMsg(direction)) => self.handle_navigate_msg(direction),
|
|
FromConstellation(ReflowCompleteMsg(id, reflow_id)) => self.handle_reflow_complete_msg(id, reflow_id),
|
|
FromConstellation(ResizeInactiveMsg(id, new_size)) => self.handle_resize_inactive_msg(id, new_size),
|
|
FromConstellation(ExitPipelineMsg(id)) => if self.handle_exit_pipeline_msg(id) { return false },
|
|
FromScript(ExitWindowMsg(id)) => self.handle_exit_window_msg(id),
|
|
FromConstellation(ResizeMsg(..)) => fail!("should have handled ResizeMsg already"),
|
|
FromScript(XHRProgressMsg(addr, progress)) => XMLHttpRequest::handle_progress(addr, progress),
|
|
FromScript(XHRReleaseMsg(addr)) => XMLHttpRequest::handle_release(addr),
|
|
FromScript(DOMMessage(..)) => fail!("unexpected message"),
|
|
FromScript(WorkerPostMessage(addr, data, nbytes)) => Worker::handle_message(addr, data, nbytes),
|
|
FromScript(WorkerRelease(addr)) => Worker::handle_release(addr),
|
|
FromDevtools(EvaluateJS(id, s, reply)) => self.handle_evaluate_js(id, s, reply),
|
|
FromDevtools(GetRootNode(id, reply)) => self.handle_get_root_node(id, reply),
|
|
FromDevtools(GetDocumentElement(id, reply)) => self.handle_get_document_element(id, reply),
|
|
FromDevtools(GetChildren(id, node_id, reply)) => self.handle_get_children(id, node_id, reply),
|
|
FromDevtools(GetLayout(id, node_id, reply)) => self.handle_get_layout(id, node_id, reply),
|
|
}
|
|
}
|
|
|
|
// Now process any pending reflows.
|
|
for id in needs_reflow.into_iter() {
|
|
self.handle_event(id, ReflowEvent(SmallVec1::new()));
|
|
}
|
|
|
|
true
|
|
}
|
|
|
|
fn handle_evaluate_js(&self, pipeline: PipelineId, eval: String, reply: Sender<EvaluateJSReply>) {
|
|
let page = get_page(&*self.page.borrow(), pipeline);
|
|
let frame = page.frame();
|
|
let window = frame.as_ref().unwrap().window.root();
|
|
let cx = window.get_cx();
|
|
let rval = window.evaluate_js_with_result(eval.as_slice());
|
|
|
|
reply.send(if rval.is_undefined() {
|
|
devtools_traits::VoidValue
|
|
} else if rval.is_boolean() {
|
|
devtools_traits::BooleanValue(rval.to_boolean())
|
|
} else if rval.is_double() {
|
|
devtools_traits::NumberValue(FromJSValConvertible::from_jsval(cx, rval, ()).unwrap())
|
|
} else if rval.is_string() {
|
|
//FIXME: use jsstring_to_str when jsval grows to_jsstring
|
|
devtools_traits::StringValue(FromJSValConvertible::from_jsval(cx, rval, conversions::Default).unwrap())
|
|
} else {
|
|
//FIXME: jsvals don't have an is_int32/is_number yet
|
|
assert!(rval.is_object_or_null());
|
|
fail!("object values unimplemented")
|
|
});
|
|
}
|
|
|
|
fn handle_get_root_node(&self, pipeline: PipelineId, reply: Sender<NodeInfo>) {
|
|
let page = get_page(&*self.page.borrow(), pipeline);
|
|
let frame = page.frame();
|
|
let document = frame.as_ref().unwrap().document.root();
|
|
|
|
let node: JSRef<Node> = NodeCast::from_ref(*document);
|
|
reply.send(node.summarize());
|
|
}
|
|
|
|
fn handle_get_document_element(&self, pipeline: PipelineId, reply: Sender<NodeInfo>) {
|
|
let page = get_page(&*self.page.borrow(), pipeline);
|
|
let frame = page.frame();
|
|
let document = frame.as_ref().unwrap().document.root();
|
|
let document_element = document.GetDocumentElement().root().unwrap();
|
|
|
|
let node: JSRef<Node> = NodeCast::from_ref(*document_element);
|
|
reply.send(node.summarize());
|
|
}
|
|
|
|
fn find_node_by_unique_id(&self, pipeline: PipelineId, node_id: String) -> Temporary<Node> {
|
|
let page = get_page(&*self.page.borrow(), pipeline);
|
|
let frame = page.frame();
|
|
let document = frame.as_ref().unwrap().document.root();
|
|
let node: JSRef<Node> = NodeCast::from_ref(*document);
|
|
|
|
for candidate in node.traverse_preorder() {
|
|
if candidate.get_unique_id().as_slice() == node_id.as_slice() {
|
|
return Temporary::from_rooted(candidate);
|
|
}
|
|
}
|
|
|
|
fail!("couldn't find node with unique id {:s}", node_id)
|
|
}
|
|
|
|
fn handle_get_children(&self, pipeline: PipelineId, node_id: String, reply: Sender<Vec<NodeInfo>>) {
|
|
let parent = self.find_node_by_unique_id(pipeline, node_id).root();
|
|
let children = parent.children().map(|child| child.summarize()).collect();
|
|
reply.send(children);
|
|
}
|
|
|
|
fn handle_get_layout(&self, pipeline: PipelineId, node_id: String, reply: Sender<(f32, f32)>) {
|
|
let node = self.find_node_by_unique_id(pipeline, node_id).root();
|
|
let elem: JSRef<Element> = ElementCast::to_ref(*node).expect("should be getting layout of element");
|
|
let rect = elem.GetBoundingClientRect().root();
|
|
reply.send((rect.Width(), rect.Height()));
|
|
}
|
|
|
|
fn handle_new_layout(&self, new_layout_info: NewLayoutInfo) {
|
|
debug!("Script: new layout: {:?}", new_layout_info);
|
|
let NewLayoutInfo {
|
|
old_pipeline_id,
|
|
new_pipeline_id,
|
|
subpage_id,
|
|
layout_chan
|
|
} = new_layout_info;
|
|
|
|
let mut page = self.page.borrow_mut();
|
|
let parent_page = page.find(old_pipeline_id).expect("ScriptTask: received a layout
|
|
whose parent has a PipelineId which does not correspond to a pipeline in the script
|
|
task's page tree. This is a bug.");
|
|
let new_page = {
|
|
let window_size = parent_page.window_size.get();
|
|
Page::new(new_pipeline_id, Some(subpage_id),
|
|
LayoutChan(layout_chan.downcast_ref::<Sender<layout_interface::Msg>>().unwrap().clone()),
|
|
window_size,
|
|
parent_page.resource_task.clone(),
|
|
self.constellation_chan.clone(),
|
|
self.js_context.borrow().as_ref().unwrap().clone())
|
|
};
|
|
parent_page.children.borrow_mut().push(Rc::new(new_page));
|
|
}
|
|
|
|
/// Handles a timer that fired.
|
|
fn handle_fire_timer_msg(&self, id: PipelineId, timer_id: TimerId) {
|
|
let mut page = self.page.borrow_mut();
|
|
let page = page.find(id).expect("ScriptTask: received fire timer msg for a
|
|
pipeline ID not associated with this script task. This is a bug.");
|
|
let frame = page.frame();
|
|
let window = frame.as_ref().unwrap().window.root();
|
|
window.handle_fire_timer(timer_id, self.get_cx());
|
|
}
|
|
|
|
/// Handles a notification that reflow completed.
|
|
fn handle_reflow_complete_msg(&self, pipeline_id: PipelineId, reflow_id: uint) {
|
|
debug!("Script: Reflow {:?} complete for {:?}", reflow_id, pipeline_id);
|
|
let mut page = self.page.borrow_mut();
|
|
let page = page.find(pipeline_id).expect(
|
|
"ScriptTask: received a load message for a layout channel that is not associated \
|
|
with this script task. This is a bug.");
|
|
let last_reflow_id = page.last_reflow_id.get();
|
|
if last_reflow_id == reflow_id {
|
|
let mut layout_join_port = page.layout_join_port.borrow_mut();
|
|
*layout_join_port = None;
|
|
}
|
|
|
|
self.compositor.set_ready_state(pipeline_id, FinishedLoading);
|
|
|
|
if page.pending_reflows.get() > 0 {
|
|
page.pending_reflows.set(0);
|
|
self.force_reflow(&*page);
|
|
}
|
|
}
|
|
|
|
/// Handles a navigate forward or backward message.
|
|
/// TODO(tkuehn): is it ever possible to navigate only on a subframe?
|
|
fn handle_navigate_msg(&self, direction: NavigationDirection) {
|
|
let ConstellationChan(ref chan) = self.constellation_chan;
|
|
chan.send(constellation_msg::NavigateMsg(direction));
|
|
}
|
|
|
|
/// Window was resized, but this script was not active, so don't reflow yet
|
|
fn handle_resize_inactive_msg(&self, id: PipelineId, new_size: WindowSizeData) {
|
|
let mut page = self.page.borrow_mut();
|
|
let page = page.find(id).expect("Received resize message for PipelineId not associated
|
|
with a page in the page tree. This is a bug.");
|
|
page.window_size.set(new_size);
|
|
match &mut *page.mut_url() {
|
|
&Some((_, ref mut needs_reflow)) => *needs_reflow = true,
|
|
&None => (),
|
|
}
|
|
}
|
|
|
|
/// We have gotten a window.close from script, which we pass on to the compositor.
|
|
/// We do not shut down the script task now, because the compositor will ask the
|
|
/// constellation to shut down the pipeline, which will clean everything up
|
|
/// normally. If we do exit, we will tear down the DOM nodes, possibly at a point
|
|
/// where layout is still accessing them.
|
|
fn handle_exit_window_msg(&self, _: PipelineId) {
|
|
debug!("script task handling exit window msg");
|
|
|
|
// TODO(tkuehn): currently there is only one window,
|
|
// so this can afford to be naive and just shut down the
|
|
// compositor. In the future it'll need to be smarter.
|
|
self.compositor.close();
|
|
}
|
|
|
|
/// Handles a request to exit the script task and shut down layout.
|
|
/// Returns true if the script task should shut down and false otherwise.
|
|
fn handle_exit_pipeline_msg(&self, id: PipelineId) -> bool {
|
|
// If root is being exited, shut down all pages
|
|
let mut page = self.page.borrow_mut();
|
|
if page.id == id {
|
|
debug!("shutting down layout for root page {:?}", id);
|
|
*self.js_context.borrow_mut() = None;
|
|
shut_down_layout(&*page, (*self.js_runtime).ptr);
|
|
return true
|
|
}
|
|
|
|
// otherwise find just the matching page and exit all sub-pages
|
|
match page.remove(id) {
|
|
Some(ref mut page) => {
|
|
shut_down_layout(&*page, (*self.js_runtime).ptr);
|
|
false
|
|
}
|
|
// TODO(tkuehn): pipeline closing is currently duplicated across
|
|
// script and constellation, which can cause this to happen. Constellation
|
|
// needs to be smarter about exiting pipelines.
|
|
None => false,
|
|
}
|
|
|
|
}
|
|
|
|
/// The entry point to document loading. Defines bindings, sets up the window and document
|
|
/// objects, parses HTML and CSS, and kicks off initial layout.
|
|
fn load(&self, pipeline_id: PipelineId, load_data: LoadData) {
|
|
let url = load_data.url.clone();
|
|
debug!("ScriptTask: loading {} on page {:?}", url, pipeline_id);
|
|
|
|
let mut page = self.page.borrow_mut();
|
|
let page = page.find(pipeline_id).expect("ScriptTask: received a load
|
|
message for a layout channel that is not associated with this script task. This
|
|
is a bug.");
|
|
|
|
let last_loaded_url = replace(&mut *page.mut_url(), None);
|
|
match last_loaded_url {
|
|
Some((ref loaded, needs_reflow)) if *loaded == url => {
|
|
*page.mut_url() = Some((loaded.clone(), false));
|
|
if needs_reflow {
|
|
self.force_reflow(&*page);
|
|
}
|
|
return;
|
|
},
|
|
_ => (),
|
|
}
|
|
|
|
let is_javascript = url.scheme.as_slice() == "javascript";
|
|
let last_url = last_loaded_url.map(|(ref loaded, _)| loaded.clone());
|
|
|
|
let cx = self.js_context.borrow();
|
|
let cx = cx.as_ref().unwrap();
|
|
// Create the window and document objects.
|
|
let window = Window::new(cx.ptr,
|
|
page.clone(),
|
|
self.chan.clone(),
|
|
self.control_chan.clone(),
|
|
self.compositor.dup(),
|
|
self.image_cache_task.clone()).root();
|
|
let doc_url = if is_javascript {
|
|
let doc_url = last_url.unwrap_or_else(|| {
|
|
Url::parse("about:blank").unwrap()
|
|
});
|
|
*page.mut_url() = Some((doc_url.clone(), true));
|
|
doc_url
|
|
} else {
|
|
url.clone()
|
|
};
|
|
let document = Document::new(*window, Some(doc_url), HTMLDocument,
|
|
None, FromParser).root();
|
|
|
|
window.init_browser_context(*document);
|
|
|
|
self.compositor.set_ready_state(pipeline_id, Loading);
|
|
|
|
let parser_input = if !is_javascript {
|
|
InputUrl(url.clone())
|
|
} else {
|
|
let evalstr = load_data.url.non_relative_scheme_data().unwrap();
|
|
let jsval = window.evaluate_js_with_result(evalstr);
|
|
let strval = FromJSValConvertible::from_jsval(self.get_cx(), jsval, Empty);
|
|
InputString(strval.unwrap_or("".to_string()))
|
|
};
|
|
|
|
{
|
|
// Create the root frame.
|
|
let mut frame = page.mut_frame();
|
|
*frame = Some(Frame {
|
|
document: JS::from_rooted(*document),
|
|
window: JS::from_rooted(*window),
|
|
});
|
|
}
|
|
|
|
parse_html(&*page, *document, parser_input, self.resource_task.clone(), Some(load_data));
|
|
|
|
document.set_ready_state(DocumentReadyStateValues::Interactive);
|
|
|
|
// Kick off the initial reflow of the page.
|
|
debug!("kicking off initial reflow of {}", url);
|
|
{
|
|
let document_js_ref = (&*document).clone();
|
|
let document_as_node = NodeCast::from_ref(document_js_ref);
|
|
document.content_changed(document_as_node);
|
|
}
|
|
window.flush_layout();
|
|
|
|
{
|
|
// No more reflow required
|
|
let mut page_url = page.mut_url();
|
|
*page_url = Some((url.clone(), false));
|
|
}
|
|
|
|
// https://html.spec.whatwg.org/multipage/#the-end step 4
|
|
let event = Event::new(&global::Window(*window), "DOMContentLoaded".to_string(),
|
|
DoesNotBubble, NotCancelable).root();
|
|
let doctarget: JSRef<EventTarget> = EventTargetCast::from_ref(*document);
|
|
let _ = doctarget.DispatchEvent(*event);
|
|
|
|
// We have no concept of a document loader right now, so just dispatch the
|
|
// "load" event as soon as we've finished executing all scripts parsed during
|
|
// the initial load.
|
|
|
|
// https://html.spec.whatwg.org/multipage/#the-end step 7
|
|
document.set_ready_state(DocumentReadyStateValues::Complete);
|
|
|
|
let event = Event::new(&global::Window(*window), "load".to_string(), DoesNotBubble, NotCancelable).root();
|
|
let wintarget: JSRef<EventTarget> = EventTargetCast::from_ref(*window);
|
|
let _ = wintarget.dispatch_event_with_target(Some(doctarget), *event);
|
|
|
|
*page.fragment_name.borrow_mut() = url.fragment.clone();
|
|
|
|
let ConstellationChan(ref chan) = self.constellation_chan;
|
|
chan.send(LoadCompleteMsg(page.id, url));
|
|
}
|
|
|
|
fn scroll_fragment_point(&self, pipeline_id: PipelineId, node: JSRef<Element>) {
|
|
let node: JSRef<Node> = NodeCast::from_ref(node);
|
|
let rect = node.get_bounding_content_box();
|
|
let point = Point2D(to_frac_px(rect.origin.x).to_f32().unwrap(),
|
|
to_frac_px(rect.origin.y).to_f32().unwrap());
|
|
// FIXME(#2003, pcwalton): This is pretty bogus when multiple layers are involved.
|
|
// Really what needs to happen is that this needs to go through layout to ask which
|
|
// layer the element belongs to, and have it send the scroll message to the
|
|
// compositor.
|
|
self.compositor.scroll_fragment_point(pipeline_id, LayerId::null(), point);
|
|
}
|
|
|
|
fn force_reflow(&self, page: &Page) {
|
|
{
|
|
let mut pending = page.pending_dirty_nodes.borrow_mut();
|
|
let js_runtime = self.js_runtime.deref().ptr;
|
|
|
|
for untrusted_node in pending.into_iter() {
|
|
let node = node::from_untrusted_node_address(js_runtime, untrusted_node).root();
|
|
node.dirty();
|
|
}
|
|
}
|
|
|
|
page.damage();
|
|
page.reflow(ReflowForDisplay, self.control_chan.clone(), &*self.compositor, NoQuery);
|
|
}
|
|
|
|
/// This is the main entry point for receiving and dispatching DOM events.
|
|
///
|
|
/// TODO: Actually perform DOM event dispatch.
|
|
fn handle_event(&self, pipeline_id: PipelineId, event: CompositorEvent) {
|
|
match event {
|
|
ResizeEvent(new_size) => {
|
|
debug!("script got resize event: {:?}", new_size);
|
|
|
|
let window = {
|
|
let page = get_page(&*self.page.borrow(), pipeline_id);
|
|
page.window_size.set(new_size);
|
|
|
|
let frame = page.frame();
|
|
if frame.is_some() {
|
|
self.force_reflow(&*page);
|
|
}
|
|
|
|
let fragment_node =
|
|
page.fragment_name
|
|
.borrow_mut()
|
|
.take()
|
|
.and_then(|name| page.find_fragment_node(name))
|
|
.root();
|
|
match fragment_node {
|
|
Some(node) => self.scroll_fragment_point(pipeline_id, *node),
|
|
None => {}
|
|
}
|
|
|
|
frame.as_ref().map(|frame| Temporary::new(frame.window.clone()))
|
|
};
|
|
|
|
match window.root() {
|
|
Some(window) => {
|
|
// http://dev.w3.org/csswg/cssom-view/#resizing-viewports
|
|
// https://dvcs.w3.org/hg/dom3events/raw-file/tip/html/DOM3-Events.html#event-type-resize
|
|
let uievent = UIEvent::new(window.clone(),
|
|
"resize".to_string(), false,
|
|
false, Some(window.clone()),
|
|
0i32).root();
|
|
let event: JSRef<Event> = EventCast::from_ref(*uievent);
|
|
|
|
let wintarget: JSRef<EventTarget> = EventTargetCast::from_ref(*window);
|
|
let _ = wintarget.dispatch_event_with_target(None, event);
|
|
}
|
|
None => ()
|
|
}
|
|
}
|
|
|
|
// FIXME(pcwalton): This reflows the entire document and is not incremental-y.
|
|
ReflowEvent(to_dirty) => {
|
|
debug!("script got reflow event");
|
|
assert_eq!(to_dirty.len(), 0);
|
|
let page = get_page(&*self.page.borrow(), pipeline_id);
|
|
let frame = page.frame();
|
|
if frame.is_some() {
|
|
let in_layout = page.layout_join_port.borrow().is_some();
|
|
if in_layout {
|
|
page.pending_reflows.set(page.pending_reflows.get() + 1);
|
|
} else {
|
|
self.force_reflow(&*page);
|
|
}
|
|
}
|
|
}
|
|
|
|
ClickEvent(_button, point) => {
|
|
debug!("ClickEvent: clicked at {:?}", point);
|
|
let page = get_page(&*self.page.borrow(), pipeline_id);
|
|
match page.hit_test(&point) {
|
|
Some(node_address) => {
|
|
debug!("node address is {:?}", node_address);
|
|
|
|
let temp_node =
|
|
node::from_untrusted_node_address(
|
|
self.js_runtime.ptr, node_address).root();
|
|
|
|
let maybe_node = if !temp_node.is_element() {
|
|
temp_node.ancestors().find(|node| node.is_element())
|
|
} else {
|
|
Some(*temp_node)
|
|
};
|
|
|
|
match maybe_node {
|
|
Some(node) => {
|
|
debug!("clicked on {:s}", node.debug_str());
|
|
// Prevent click event if form control element is disabled.
|
|
if node.click_event_filter_by_disabled_state() { return; }
|
|
match *page.frame() {
|
|
Some(ref frame) => {
|
|
let window = frame.window.root();
|
|
let event =
|
|
Event::new(&global::Window(*window),
|
|
"click".to_string(),
|
|
Bubbles, Cancelable).root();
|
|
let eventtarget: JSRef<EventTarget> = EventTargetCast::from_ref(node);
|
|
let _ = eventtarget.dispatch_event_with_target(None, *event);
|
|
|
|
window.flush_layout();
|
|
}
|
|
None => {}
|
|
}
|
|
}
|
|
None => {}
|
|
}
|
|
}
|
|
|
|
None => {}
|
|
}
|
|
}
|
|
MouseDownEvent(..) => {}
|
|
MouseUpEvent(..) => {}
|
|
MouseMoveEvent(point) => {
|
|
let page = get_page(&*self.page.borrow(), pipeline_id);
|
|
match page.get_nodes_under_mouse(&point) {
|
|
Some(node_address) => {
|
|
|
|
let mut target_list = vec!();
|
|
let mut target_compare = false;
|
|
|
|
let mouse_over_targets = &mut *self.mouse_over_targets.borrow_mut();
|
|
match *mouse_over_targets {
|
|
Some(ref mut mouse_over_targets) => {
|
|
for node in mouse_over_targets.iter_mut() {
|
|
let node = node.root();
|
|
node.set_hover_state(false);
|
|
}
|
|
}
|
|
None => {}
|
|
}
|
|
|
|
for node_address in node_address.iter() {
|
|
|
|
let temp_node =
|
|
node::from_untrusted_node_address(
|
|
self.js_runtime.ptr, *node_address);
|
|
|
|
let maybe_node = temp_node.root().ancestors().find(|node| node.is_element());
|
|
match maybe_node {
|
|
Some(node) => {
|
|
node.set_hover_state(true);
|
|
|
|
match *mouse_over_targets {
|
|
Some(ref mouse_over_targets) => {
|
|
if !target_compare {
|
|
target_compare = !mouse_over_targets.contains(&JS::from_rooted(node));
|
|
}
|
|
}
|
|
None => {}
|
|
}
|
|
target_list.push(JS::from_rooted(node));
|
|
}
|
|
None => {}
|
|
}
|
|
}
|
|
match *mouse_over_targets {
|
|
Some(ref mouse_over_targets) => {
|
|
if mouse_over_targets.len() != target_list.len() {
|
|
target_compare = true;
|
|
}
|
|
}
|
|
None => { target_compare = true; }
|
|
}
|
|
|
|
if target_compare {
|
|
if mouse_over_targets.is_some() {
|
|
self.force_reflow(&*page);
|
|
}
|
|
*mouse_over_targets = Some(target_list);
|
|
}
|
|
}
|
|
|
|
None => {}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// The entry point for content to notify that a new load has been requested
|
|
/// for the given pipeline.
|
|
fn trigger_load(&self, pipeline_id: PipelineId, load_data: LoadData) {
|
|
let ConstellationChan(ref const_chan) = self.constellation_chan;
|
|
const_chan.send(LoadUrlMsg(pipeline_id, load_data));
|
|
}
|
|
|
|
/// The entry point for content to notify that a fragment url has been requested
|
|
/// for the given pipeline.
|
|
fn trigger_fragment(&self, pipeline_id: PipelineId, url: Url) {
|
|
let page = get_page(&*self.page.borrow(), pipeline_id);
|
|
match page.find_fragment_node(url.fragment.unwrap()).root() {
|
|
Some(node) => {
|
|
self.scroll_fragment_point(pipeline_id, *node);
|
|
}
|
|
None => {}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Shuts down layout for the given page tree.
|
|
fn shut_down_layout(page_tree: &Rc<Page>, rt: *mut JSRuntime) {
|
|
for page in page_tree.iter() {
|
|
page.join_layout();
|
|
|
|
// Tell the layout task to begin shutting down, and wait until it
|
|
// processed this message.
|
|
let (response_chan, response_port) = channel();
|
|
let LayoutChan(ref chan) = page.layout_chan;
|
|
chan.send(layout_interface::PrepareToExitMsg(response_chan));
|
|
response_port.recv();
|
|
}
|
|
|
|
// Remove our references to the DOM objects in this page tree.
|
|
for page in page_tree.iter() {
|
|
*page.mut_frame() = None;
|
|
}
|
|
|
|
// Drop our references to the JSContext, potentially triggering a GC.
|
|
for page in page_tree.iter() {
|
|
*page.mut_js_info() = None;
|
|
}
|
|
|
|
// Force a GC to make sure that our DOM reflectors are released before we tell
|
|
// layout to exit.
|
|
unsafe {
|
|
JS_GC(rt);
|
|
}
|
|
|
|
// Destroy the layout task. If there were node leaks, layout will now crash safely.
|
|
for page in page_tree.iter() {
|
|
let LayoutChan(ref chan) = page.layout_chan;
|
|
chan.send(layout_interface::ExitNowMsg);
|
|
}
|
|
}
|
|
|
|
|
|
fn get_page(page: &Rc<Page>, pipeline_id: PipelineId) -> Rc<Page> {
|
|
page.find(pipeline_id).expect("ScriptTask: received an event \
|
|
message for a layout channel that is not associated with this script task.\
|
|
This is a bug.")
|
|
}
|