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https://github.com/servo/servo.git
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script: Stop using time in DOM timers (#33262)
This switches to using `std::time` types for DOM timer operations, which allows removing our custom time units in favor of `Duration`. Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson
GitHub
parent
8a0c7487e7
commit
a4ceb82ef5
13 changed files with 78 additions and 106 deletions
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@ -3,21 +3,18 @@
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use std::cell::Cell;
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use std::cmp::{self, Ord, Ordering};
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use std::cmp::{Ord, Ordering};
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use std::collections::HashMap;
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use std::default::Default;
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use std::rc::Rc;
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use std::time::{Duration, Instant};
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use deny_public_fields::DenyPublicFields;
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use euclid::Length;
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use ipc_channel::ipc::IpcSender;
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use js::jsapi::Heap;
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use js::jsval::{JSVal, UndefinedValue};
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use js::rust::HandleValue;
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use script_traits::{
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precise_time_ms, MsDuration, TimerEvent, TimerEventId, TimerEventRequest, TimerSchedulerMsg,
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TimerSource,
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};
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use script_traits::{TimerEvent, TimerEventId, TimerEventRequest, TimerSchedulerMsg, TimerSource};
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use servo_config::pref;
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use crate::dom::bindings::callback::ExceptionHandling::Report;
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@ -52,14 +49,12 @@ pub struct OneshotTimers {
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scheduler_chan: IpcSender<TimerSchedulerMsg>,
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next_timer_handle: Cell<OneshotTimerHandle>,
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timers: DomRefCell<Vec<OneshotTimer>>,
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#[no_trace]
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suspended_since: Cell<Option<MsDuration>>,
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suspended_since: Cell<Option<Instant>>,
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/// Initially 0, increased whenever the associated document is reactivated
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/// by the amount of ms the document was inactive. The current time can be
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/// offset back by this amount for a coherent time across document
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/// activations.
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#[no_trace]
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suspension_offset: Cell<MsDuration>,
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suspension_offset: Cell<Duration>,
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/// Calls to `fire_timer` with a different argument than this get ignored.
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/// They were previously scheduled and got invalidated when
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/// - timers were suspended,
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@ -76,8 +71,7 @@ struct OneshotTimer {
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#[no_trace]
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source: TimerSource,
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callback: OneshotTimerCallback,
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#[no_trace]
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scheduled_for: MsDuration,
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scheduled_for: Instant,
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}
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// This enum is required to work around the fact that trait objects do not support generic methods.
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@ -137,7 +131,7 @@ impl OneshotTimers {
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next_timer_handle: Cell::new(OneshotTimerHandle(1)),
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timers: DomRefCell::new(Vec::new()),
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suspended_since: Cell::new(None),
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suspension_offset: Cell::new(Length::new(0)),
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suspension_offset: Cell::new(Duration::ZERO),
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expected_event_id: Cell::new(TimerEventId(0)),
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}
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}
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@ -151,20 +145,18 @@ impl OneshotTimers {
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pub fn schedule_callback(
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&self,
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callback: OneshotTimerCallback,
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duration: MsDuration,
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duration: Duration,
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source: TimerSource,
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) -> OneshotTimerHandle {
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let new_handle = self.next_timer_handle.get();
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self.next_timer_handle
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.set(OneshotTimerHandle(new_handle.0 + 1));
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let scheduled_for = self.base_time() + duration;
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let timer = OneshotTimer {
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handle: new_handle,
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source,
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callback,
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scheduled_for,
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scheduled_for: self.base_time() + duration,
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};
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{
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@ -247,18 +239,18 @@ impl OneshotTimers {
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self.schedule_timer_call();
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}
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fn base_time(&self) -> MsDuration {
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fn base_time(&self) -> Instant {
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let offset = self.suspension_offset.get();
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match self.suspended_since.get() {
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Some(time) => time - offset,
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None => precise_time_ms() - offset,
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Some(suspend_time) => suspend_time - offset,
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None => Instant::now() - offset,
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}
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}
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pub fn slow_down(&self) {
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let duration = pref!(js.timers.minimum_duration) as u64;
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self.js_timers.set_min_duration(MsDuration::new(duration));
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let min_duration_ms = pref!(js.timers.minimum_duration) as u64;
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self.js_timers
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.set_min_duration(Duration::from_millis(min_duration_ms));
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}
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pub fn speed_up(&self) {
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@ -272,14 +264,14 @@ impl OneshotTimers {
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}
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debug!("Suspending timers.");
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self.suspended_since.set(Some(precise_time_ms()));
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self.suspended_since.set(Some(Instant::now()));
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self.invalidate_expected_event_id();
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}
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pub fn resume(&self) {
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// Resume is idempotent: do nothing if the timers are already resumed.
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let additional_offset = match self.suspended_since.get() {
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Some(suspended_since) => precise_time_ms() - suspended_since,
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Some(suspended_since) => Instant::now() - suspended_since,
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None => return warn!("Resuming an already resumed timer."),
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};
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@ -302,12 +294,7 @@ impl OneshotTimers {
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if let Some(timer) = timers.last() {
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let expected_event_id = self.invalidate_expected_event_id();
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let delay = Length::new(
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timer
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.scheduled_for
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.get()
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.saturating_sub(precise_time_ms().get()),
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);
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let delay = timer.scheduled_for - Instant::now();
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let request = TimerEventRequest(
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self.timer_event_chan
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.borrow()
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@ -339,7 +326,7 @@ impl OneshotTimers {
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global: &GlobalScope,
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callback: TimerCallback,
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arguments: Vec<HandleValue>,
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timeout: i32,
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timeout: Duration,
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is_interval: IsInterval,
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source: TimerSource,
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) -> i32 {
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@ -369,8 +356,7 @@ pub struct JsTimers {
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/// The nesting level of the currently executing timer task or 0.
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nesting_level: Cell<u32>,
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/// Used to introduce a minimum delay in event intervals
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#[no_trace]
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min_duration: Cell<Option<MsDuration>>,
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min_duration: Cell<Option<Duration>>,
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}
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#[derive(JSTraceable, MallocSizeOf)]
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@ -391,8 +377,7 @@ pub struct JsTimerTask {
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callback: InternalTimerCallback,
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is_interval: IsInterval,
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nesting_level: u32,
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#[no_trace]
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duration: MsDuration,
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duration: Duration,
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is_user_interacting: bool,
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}
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@ -436,7 +421,7 @@ impl JsTimers {
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global: &GlobalScope,
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callback: TimerCallback,
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arguments: Vec<HandleValue>,
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timeout: i32,
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timeout: Duration,
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is_interval: IsInterval,
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source: TimerSource,
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) -> i32 {
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@ -480,11 +465,11 @@ impl JsTimers {
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is_interval,
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is_user_interacting: ScriptThread::is_user_interacting(),
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nesting_level: 0,
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duration: Length::new(0),
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duration: Duration::ZERO,
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};
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// step 5
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task.duration = Length::new(cmp::max(0, timeout) as u64);
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task.duration = timeout.max(Duration::ZERO);
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// step 3, 6-9, 11-14
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self.initialize_and_schedule(global, task);
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@ -501,7 +486,7 @@ impl JsTimers {
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}
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}
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pub fn set_min_duration(&self, duration: MsDuration) {
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pub fn set_min_duration(&self, duration: Duration) {
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self.min_duration.set(Some(duration));
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}
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@ -510,9 +495,9 @@ impl JsTimers {
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}
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// see step 13 of https://html.spec.whatwg.org/multipage/#timer-initialisation-steps
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fn user_agent_pad(&self, current_duration: MsDuration) -> MsDuration {
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fn user_agent_pad(&self, current_duration: Duration) -> Duration {
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match self.min_duration.get() {
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Some(min_duration) => cmp::max(min_duration, current_duration),
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Some(min_duration) => min_duration.max(current_duration),
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None => current_duration,
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}
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}
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@ -543,10 +528,10 @@ impl JsTimers {
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}
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// see step 7 of https://html.spec.whatwg.org/multipage/#timer-initialisation-steps
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fn clamp_duration(nesting_level: u32, unclamped: MsDuration) -> MsDuration {
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let lower_bound = if nesting_level > 5 { 4 } else { 0 };
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cmp::max(Length::new(lower_bound), unclamped)
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fn clamp_duration(nesting_level: u32, unclamped: Duration) -> Duration {
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let lower_bound_ms = if nesting_level > 5 { 4 } else { 0 };
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let lower_bound = Duration::from_millis(lower_bound_ms);
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lower_bound.max(unclamped)
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}
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impl JsTimerTask {
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