Delete unused eventTimes Fiber field

`eventTimes` represents the timestamp of the event that scheduled an update. The last remaining use for this field was the JND delay that was removed in facebook#26597. We can now delete it, and all the code we had for tracking it.
acdlite · Apr 11, 2023 · f9f454d · f9f454d
1 parent 0b931f9
commit f9f454d
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Showing 10 changed files with 33 additions and 124 deletions.
diff --git a/packages/react-reconciler/src/ReactFiberBeginWork.js b/packages/react-reconciler/src/ReactFiberBeginWork.js
@@ -142,7 +142,6 @@ import {
   OffscreenLane,
   DefaultHydrationLane,
   SomeRetryLane,
-  NoTimestamp,
   includesSomeLane,
   laneToLanes,
   removeLanes,
@@ -2876,15 +2875,8 @@ function updateDehydratedSuspenseComponent(
           // is one of the very rare times where we mutate the current tree
           // during the render phase.
           suspenseState.retryLane = attemptHydrationAtLane;
-          // TODO: Ideally this would inherit the event time of the current render
-          const eventTime = NoTimestamp;
           enqueueConcurrentRenderForLane(current, attemptHydrationAtLane);
-          scheduleUpdateOnFiber(
-            root,
-            current,
-            attemptHydrationAtLane,
-            eventTime,
-          );
+          scheduleUpdateOnFiber(root, current, attemptHydrationAtLane);
 
           // Throw a special object that signals to the work loop that it should
           // interrupt the current render.

diff --git a/packages/react-reconciler/src/ReactFiberClassComponent.js b/packages/react-reconciler/src/ReactFiberClassComponent.js
@@ -64,11 +64,7 @@ import {
   emptyContextObject,
 } from './ReactFiberContext';
 import {readContext, checkIfContextChanged} from './ReactFiberNewContext';
-import {
-  requestEventTime,
-  requestUpdateLane,
-  scheduleUpdateOnFiber,
-} from './ReactFiberWorkLoop';
+import {requestUpdateLane, scheduleUpdateOnFiber} from './ReactFiberWorkLoop';
 import {logForceUpdateScheduled, logStateUpdateScheduled} from './DebugTracing';
 import {
   markForceUpdateScheduled,
@@ -213,8 +209,7 @@ const classComponentUpdater = {
 
     const root = enqueueUpdate(fiber, update, lane);
     if (root !== null) {
-      const eventTime = requestEventTime();
-      scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+      scheduleUpdateOnFiber(root, fiber, lane);
       entangleTransitions(root, fiber, lane);
     }
 
@@ -248,8 +243,7 @@ const classComponentUpdater = {
 
     const root = enqueueUpdate(fiber, update, lane);
     if (root !== null) {
-      const eventTime = requestEventTime();
-      scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+      scheduleUpdateOnFiber(root, fiber, lane);
       entangleTransitions(root, fiber, lane);
     }
 
@@ -283,8 +277,7 @@ const classComponentUpdater = {
 
     const root = enqueueUpdate(fiber, update, lane);
     if (root !== null) {
-      const eventTime = requestEventTime();
-      scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+      scheduleUpdateOnFiber(root, fiber, lane);
       entangleTransitions(root, fiber, lane);
     }
 

diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.js b/packages/react-reconciler/src/ReactFiberCommitWork.js
@@ -18,7 +18,7 @@ import type {
 } from './ReactFiberConfig';
 import type {Fiber, FiberRoot} from './ReactInternalTypes';
 import type {Lanes} from './ReactFiberLane';
-import {NoTimestamp, SyncLane} from './ReactFiberLane';
+import {SyncLane} from './ReactFiberLane';
 import type {SuspenseState, RetryQueue} from './ReactFiberSuspenseComponent';
 import type {UpdateQueue} from './ReactFiberClassUpdateQueue';
 import type {FunctionComponentUpdateQueue} from './ReactFiberHooks';
@@ -2415,7 +2415,7 @@ export function detachOffscreenInstance(instance: OffscreenInstance): void {
   const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
   if (root !== null) {
     instance._pendingVisibility |= OffscreenDetached;
-    scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+    scheduleUpdateOnFiber(root, fiber, SyncLane);
   }
 }
 
@@ -2435,7 +2435,7 @@ export function attachOffscreenInstance(instance: OffscreenInstance): void {
   const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
   if (root !== null) {
     instance._pendingVisibility &= ~OffscreenDetached;
-    scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+    scheduleUpdateOnFiber(root, fiber, SyncLane);
   }
 }
 

diff --git a/packages/react-reconciler/src/ReactFiberHooks.js b/packages/react-reconciler/src/ReactFiberHooks.js
@@ -70,7 +70,6 @@ import {
   isTransitionLane,
   markRootEntangled,
   markRootMutableRead,
-  NoTimestamp,
 } from './ReactFiberLane';
 import {
   ContinuousEventPriority,
@@ -101,7 +100,6 @@ import {
   getWorkInProgressRootRenderLanes,
   scheduleUpdateOnFiber,
   requestUpdateLane,
-  requestEventTime,
   markSkippedUpdateLanes,
   isInvalidExecutionContextForEventFunction,
 } from './ReactFiberWorkLoop';
@@ -1837,7 +1835,7 @@ function checkIfSnapshotChanged<T>(inst: StoreInstance<T>): boolean {
 function forceStoreRerender(fiber: Fiber) {
   const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
   if (root !== null) {
-    scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+    scheduleUpdateOnFiber(root, fiber, SyncLane);
   }
 }
 
@@ -2558,8 +2556,7 @@ function refreshCache<T>(fiber: Fiber, seedKey: ?() => T, seedValue: T): void {
         const refreshUpdate = createLegacyQueueUpdate(lane);
         const root = enqueueLegacyQueueUpdate(provider, refreshUpdate, lane);
         if (root !== null) {
-          const eventTime = requestEventTime();
-          scheduleUpdateOnFiber(root, provider, lane, eventTime);
+          scheduleUpdateOnFiber(root, provider, lane);
           entangleLegacyQueueTransitions(root, provider, lane);
         }
 
@@ -2623,8 +2620,7 @@ function dispatchReducerAction<S, A>(
   } else {
     const root = enqueueConcurrentHookUpdate(fiber, queue, update, lane);
     if (root !== null) {
-      const eventTime = requestEventTime();
-      scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+      scheduleUpdateOnFiber(root, fiber, lane);
       entangleTransitionUpdate(root, queue, lane);
     }
   }
@@ -2706,8 +2702,7 @@ function dispatchSetState<S, A>(
 
     const root = enqueueConcurrentHookUpdate(fiber, queue, update, lane);
     if (root !== null) {
-      const eventTime = requestEventTime();
-      scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+      scheduleUpdateOnFiber(root, fiber, lane);
       entangleTransitionUpdate(root, queue, lane);
     }
   }

diff --git a/packages/react-reconciler/src/ReactFiberHotReloading.js b/packages/react-reconciler/src/ReactFiberHotReloading.js
@@ -23,7 +23,7 @@ import {
 import {enqueueConcurrentRenderForLane} from './ReactFiberConcurrentUpdates';
 import {updateContainer} from './ReactFiberReconciler';
 import {emptyContextObject} from './ReactFiberContext';
-import {SyncLane, NoTimestamp} from './ReactFiberLane';
+import {SyncLane} from './ReactFiberLane';
 import {
   ClassComponent,
   FunctionComponent,
@@ -328,7 +328,7 @@ function scheduleFibersWithFamiliesRecursively(
     if (needsRemount || needsRender) {
       const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
       if (root !== null) {
-        scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+        scheduleUpdateOnFiber(root, fiber, SyncLane);
       }
     }
     if (child !== null && !needsRemount) {

diff --git a/packages/react-reconciler/src/ReactFiberLane.js b/packages/react-reconciler/src/ReactFiberLane.js
@@ -319,25 +319,6 @@ export function getNextLanes(root: FiberRoot, wipLanes: Lanes): Lanes {
   return nextLanes;
 }
 
-export function getMostRecentEventTime(root: FiberRoot, lanes: Lanes): number {
-  const eventTimes = root.eventTimes;
-
-  let mostRecentEventTime = NoTimestamp;
-  while (lanes > 0) {
-    const index = pickArbitraryLaneIndex(lanes);
-    const lane = 1 << index;
-
-    const eventTime = eventTimes[index];
-    if (eventTime > mostRecentEventTime) {
-      mostRecentEventTime = eventTime;
-    }
-
-    lanes &= ~lane;
-  }
-
-  return mostRecentEventTime;
-}
-
 function computeExpirationTime(lane: Lane, currentTime: number) {
   switch (lane) {
     case SyncHydrationLane:
@@ -599,11 +580,7 @@ export function createLaneMap<T>(initial: T): LaneMap<T> {
   return laneMap;
 }
 
-export function markRootUpdated(
-  root: FiberRoot,
-  updateLane: Lane,
-  eventTime: number,
-) {
+export function markRootUpdated(root: FiberRoot, updateLane: Lane) {
   root.pendingLanes |= updateLane;
 
   // If there are any suspended transitions, it's possible this new update
@@ -622,12 +599,6 @@ export function markRootUpdated(
     root.suspendedLanes = NoLanes;
     root.pingedLanes = NoLanes;
   }
-
-  const eventTimes = root.eventTimes;
-  const index = laneToIndex(updateLane);
-  // We can always overwrite an existing timestamp because we prefer the most
-  // recent event, and we assume time is monotonically increasing.
-  eventTimes[index] = eventTime;
 }
 
 export function markRootSuspended(root: FiberRoot, suspendedLanes: Lanes) {
@@ -672,7 +643,6 @@ export function markRootFinished(root: FiberRoot, remainingLanes: Lanes) {
   root.errorRecoveryDisabledLanes &= remainingLanes;
 
   const entanglements = root.entanglements;
-  const eventTimes = root.eventTimes;
   const expirationTimes = root.expirationTimes;
   const hiddenUpdates = root.hiddenUpdates;
 
@@ -683,7 +653,6 @@ export function markRootFinished(root: FiberRoot, remainingLanes: Lanes) {
     const lane = 1 << index;
 
     entanglements[index] = NoLanes;
-    eventTimes[index] = NoTimestamp;
     expirationTimes[index] = NoTimestamp;
 
     const hiddenUpdatesForLane = hiddenUpdates[index];

diff --git a/packages/react-reconciler/src/ReactFiberReconciler.js b/packages/react-reconciler/src/ReactFiberReconciler.js
@@ -56,7 +56,6 @@ import {
   onScheduleRoot,
 } from './ReactFiberDevToolsHook';
 import {
-  requestEventTime,
   requestUpdateLane,
   scheduleUpdateOnFiber,
   scheduleInitialHydrationOnRoot,
@@ -84,7 +83,6 @@ import {StrictLegacyMode} from './ReactTypeOfMode';
 import {
   SyncLane,
   SelectiveHydrationLane,
-  NoTimestamp,
   getHighestPriorityPendingLanes,
   higherPriorityLane,
 } from './ReactFiberLane';
@@ -311,9 +309,8 @@ export function createHydrationContainer(
   const update = createUpdate(lane);
   update.callback =
     callback !== undefined && callback !== null ? callback : null;
-  const eventTime = requestEventTime();
   enqueueUpdate(current, update, lane);
-  scheduleInitialHydrationOnRoot(root, lane, eventTime);
+  scheduleInitialHydrationOnRoot(root, lane);
 
   return root;
 }
@@ -379,8 +376,7 @@ export function updateContainer(
 
   const root = enqueueUpdate(current, update, lane);
   if (root !== null) {
-    const eventTime = requestEventTime();
-    scheduleUpdateOnFiber(root, current, lane, eventTime);
+    scheduleUpdateOnFiber(root, current, lane);
     entangleTransitions(root, current, lane);
   }
 
@@ -427,8 +423,7 @@ export function attemptSynchronousHydration(fiber: Fiber): void {
       flushSync(() => {
         const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
         if (root !== null) {
-          const eventTime = requestEventTime();
-          scheduleUpdateOnFiber(root, fiber, SyncLane, eventTime);
+          scheduleUpdateOnFiber(root, fiber, SyncLane);
         }
       });
       // If we're still blocked after this, we need to increase
@@ -471,8 +466,7 @@ export function attemptContinuousHydration(fiber: Fiber): void {
   const lane = SelectiveHydrationLane;
   const root = enqueueConcurrentRenderForLane(fiber, lane);
   if (root !== null) {
-    const eventTime = requestEventTime();
-    scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+    scheduleUpdateOnFiber(root, fiber, lane);
   }
   markRetryLaneIfNotHydrated(fiber, lane);
 }
@@ -486,8 +480,7 @@ export function attemptHydrationAtCurrentPriority(fiber: Fiber): void {
   const lane = requestUpdateLane(fiber);
   const root = enqueueConcurrentRenderForLane(fiber, lane);
   if (root !== null) {
-    const eventTime = requestEventTime();
-    scheduleUpdateOnFiber(root, fiber, lane, eventTime);
+    scheduleUpdateOnFiber(root, fiber, lane);
   }
   markRetryLaneIfNotHydrated(fiber, lane);
 }
@@ -666,7 +659,7 @@ if (__DEV__) {
 
       const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
       if (root !== null) {
-        scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+        scheduleUpdateOnFiber(root, fiber, SyncLane);
       }
     }
   };
@@ -690,7 +683,7 @@ if (__DEV__) {
 
       const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
       if (root !== null) {
-        scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+        scheduleUpdateOnFiber(root, fiber, SyncLane);
       }
     }
   };
@@ -715,7 +708,7 @@ if (__DEV__) {
 
       const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
       if (root !== null) {
-        scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+        scheduleUpdateOnFiber(root, fiber, SyncLane);
       }
     }
   };
@@ -728,7 +721,7 @@ if (__DEV__) {
     }
     const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
     if (root !== null) {
-      scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+      scheduleUpdateOnFiber(root, fiber, SyncLane);
     }
   };
   overridePropsDeletePath = (fiber: Fiber, path: Array<string | number>) => {
@@ -738,7 +731,7 @@ if (__DEV__) {
     }
     const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
     if (root !== null) {
-      scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+      scheduleUpdateOnFiber(root, fiber, SyncLane);
     }
   };
   overridePropsRenamePath = (
@@ -752,14 +745,14 @@ if (__DEV__) {
     }
     const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
     if (root !== null) {
-      scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+      scheduleUpdateOnFiber(root, fiber, SyncLane);
     }
   };
 
   scheduleUpdate = (fiber: Fiber) => {
     const root = enqueueConcurrentRenderForLane(fiber, SyncLane);
     if (root !== null) {
-      scheduleUpdateOnFiber(root, fiber, SyncLane, NoTimestamp);
+      scheduleUpdateOnFiber(root, fiber, SyncLane);
     }
   };
 

diff --git a/packages/react-reconciler/src/ReactFiberRoot.js b/packages/react-reconciler/src/ReactFiberRoot.js
@@ -66,7 +66,6 @@ function FiberRootNode(
   this.next = null;
   this.callbackNode = null;
   this.callbackPriority = NoLane;
-  this.eventTimes = createLaneMap(NoLanes);
   this.expirationTimes = createLaneMap(NoTimestamp);
 
   this.pendingLanes = NoLanes;