Land interleaved updates change in main fork

packages/react-reconciler/src/ReactFiberClassComponent.old.js

@@ -214,7 +214,7 @@ const classComponentUpdater = {
       update.callback = callback;
     }
 
-    enqueueUpdate(fiber, update);
+    enqueueUpdate(fiber, update, lane);
     const root = scheduleUpdateOnFiber(fiber, lane, eventTime);
     if (root !== null) {
       entangleTransitions(root, fiber, lane);
@@ -249,7 +249,7 @@ const classComponentUpdater = {
       update.callback = callback;
     }
 
-    enqueueUpdate(fiber, update);
+    enqueueUpdate(fiber, update, lane);
     const root = scheduleUpdateOnFiber(fiber, lane, eventTime);
     if (root !== null) {
       entangleTransitions(root, fiber, lane);
@@ -283,7 +283,7 @@ const classComponentUpdater = {
       update.callback = callback;
     }
 
-    enqueueUpdate(fiber, update);
+    enqueueUpdate(fiber, update, lane);
     const root = scheduleUpdateOnFiber(fiber, lane, eventTime);
     if (root !== null) {
       entangleTransitions(root, fiber, lane);

packages/react-reconciler/src/ReactFiberHooks.old.js

@@ -77,6 +77,7 @@ import {
   warnIfNotCurrentlyActingUpdatesInDev,
   warnIfNotScopedWithMatchingAct,
   markSkippedUpdateLanes,
+  isInterleavedUpdate,
 } from './ReactFiberWorkLoop.old';
 
 import invariant from 'shared/invariant';
@@ -110,6 +111,7 @@ import {
   enqueueUpdate,
   entangleTransitions,
 } from './ReactUpdateQueue.old';
+import {pushInterleavedQueue} from './ReactFiberInterleavedUpdates.old';
 
 const {ReactCurrentDispatcher, ReactCurrentBatchConfig} = ReactSharedInternals;
 
@@ -122,8 +124,9 @@ type Update<S, A> = {|
   priority?: ReactPriorityLevel,
 |};
 
-type UpdateQueue<S, A> = {|
+export type UpdateQueue<S, A> = {|
   pending: Update<S, A> | null,
+  interleaved: Update<S, A> | null,
   lanes: Lanes,
   dispatch: (A => mixed) | null,
   lastRenderedReducer: ((S, A) => S) | null,
@@ -657,6 +660,7 @@ function mountReducer<S, I, A>(
   hook.memoizedState = hook.baseState = initialState;
   const queue = (hook.queue = {
     pending: null,
+    interleaved: null,
     lanes: NoLanes,
     dispatch: null,
     lastRenderedReducer: reducer,
@@ -800,7 +804,22 @@ function updateReducer<S, I, A>(
     queue.lastRenderedState = newState;
   }
 
-  if (baseQueue === null) {
+  // Interleaved updates are stored on a separate queue. We aren't going to
+  // process them during this render, but we do need to track which lanes
+  // are remaining.
+  const lastInterleaved = queue.interleaved;
+  if (lastInterleaved !== null) {
+    let interleaved = lastInterleaved;
+    do {
+      const interleavedLane = interleaved.lane;
+      currentlyRenderingFiber.lanes = mergeLanes(
+        currentlyRenderingFiber.lanes,
+        interleavedLane,
+      );
+      markSkippedUpdateLanes(interleavedLane);
+      interleaved = ((interleaved: any).next: Update<S, A>);
+    } while (interleaved !== lastInterleaved);
+  } else if (baseQueue === null) {
     // `queue.lanes` is used for entangling transitions. We can set it back to
     // zero once the queue is empty.
     queue.lanes = NoLanes;
@@ -1132,6 +1151,7 @@ function useMutableSource<Source, Snapshot>(
     // including any interleaving updates that occur.
     const newQueue = {
       pending: null,
+      interleaved: null,
       lanes: NoLanes,
       dispatch: null,
       lastRenderedReducer: basicStateReducer,
@@ -1188,6 +1208,7 @@ function mountState<S>(
   hook.memoizedState = hook.baseState = initialState;
   const queue = (hook.queue = {
     pending: null,
+    interleaved: null,
     lanes: NoLanes,
     dispatch: null,
     lastRenderedReducer: basicStateReducer,
@@ -1869,7 +1890,7 @@ function refreshCache<T>(fiber: Fiber, seedKey: ?() => T, seedValue: T) {
           cache: seededCache,
         };
         refreshUpdate.payload = payload;
-        enqueueUpdate(provider, refreshUpdate);
+        enqueueUpdate(provider, refreshUpdate, lane);
         return;
       }
     }
@@ -1904,17 +1925,6 @@ function dispatchAction<S, A>(
     next: (null: any),
   };
 
-  // Append the update to the end of the list.
-  const pending = queue.pending;
-  if (pending === null) {
-    // This is the first update. Create a circular list.
-    update.next = update;
-  } else {
-    update.next = pending.next;
-    pending.next = update;
-  }
-  queue.pending = update;
-
   const alternate = fiber.alternate;
   if (
     fiber === currentlyRenderingFiber ||
@@ -1924,7 +1934,41 @@ function dispatchAction<S, A>(
     // queue -> linked list of updates. After this render pass, we'll restart
     // and apply the stashed updates on top of the work-in-progress hook.
     didScheduleRenderPhaseUpdateDuringThisPass = didScheduleRenderPhaseUpdate = true;
+    const pending = queue.pending;
+    if (pending === null) {
+      // This is the first update. Create a circular list.
+      update.next = update;
+    } else {
+      update.next = pending.next;
+      pending.next = update;
+    }
+    queue.pending = update;
   } else {
+    if (isInterleavedUpdate(fiber, lane)) {
+      const interleaved = queue.interleaved;
+      if (interleaved === null) {
+        // This is the first update. Create a circular list.
+        update.next = update;
+        // At the end of the current render, this queue's interleaved updates will
+        // be transfered to the pending queue.
+        pushInterleavedQueue(queue);
+      } else {
+        update.next = interleaved.next;
+        interleaved.next = update;
+      }
+      queue.interleaved = update;
+    } else {
+      const pending = queue.pending;
+      if (pending === null) {
+        // This is the first update. Create a circular list.
+        update.next = update;
+      } else {
+        update.next = pending.next;
+        pending.next = update;
+      }
+      queue.pending = update;
+    }
+
     if (
       fiber.lanes === NoLanes &&
       (alternate === null || alternate.lanes === NoLanes)

packages/react-reconciler/src/ReactFiberInterleavedUpdates.old.js

@@ -0,0 +1,55 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+import type {UpdateQueue as HookQueue} from './ReactFiberHooks.old';
+import type {SharedQueue as ClassQueue} from './ReactUpdateQueue.old';
+
+// An array of all update queues that received updates during the current
+// render. When this render exits, either because it finishes or because it is
+// interrupted, the interleaved updates will be transfered onto the main part
+// of the queue.
+let interleavedQueues: Array<
+  HookQueue<any, any> | ClassQueue<any>,
+> | null = null;
+
+export function pushInterleavedQueue(
+  queue: HookQueue<any, any> | ClassQueue<any>,
+) {
+  if (interleavedQueues === null) {
+    interleavedQueues = [queue];
+  } else {
+    interleavedQueues.push(queue);
+  }
+}
+
+export function enqueueInterleavedUpdates() {
+  // Transfer the interleaved updates onto the main queue. Each queue has a
+  // `pending` field and an `interleaved` field. When they are not null, they
+  // point to the last node in a circular linked list. We need to append the
+  // interleaved list to the end of the pending list by joining them into a
+  // single, circular list.
+  if (interleavedQueues !== null) {
+    for (let i = 0; i < interleavedQueues.length; i++) {
+      const queue = interleavedQueues[i];
+      const lastInterleavedUpdate = queue.interleaved;
+      if (lastInterleavedUpdate !== null) {
+        queue.interleaved = null;
+        const firstInterleavedUpdate = lastInterleavedUpdate.next;
+        const lastPendingUpdate = queue.pending;
+        if (lastPendingUpdate !== null) {
+          const firstPendingUpdate = lastPendingUpdate.next;
+          lastPendingUpdate.next = (firstInterleavedUpdate: any);
+          lastInterleavedUpdate.next = (firstPendingUpdate: any);
+        }
+        queue.pending = (lastInterleavedUpdate: any);
+      }
+    }
+    interleavedQueues = null;
+  }
+}

packages/react-reconciler/src/ReactFiberNewContext.old.js

@@ -11,6 +11,7 @@ import type {ReactContext} from 'shared/ReactTypes';
 import type {Fiber, ContextDependency} from './ReactInternalTypes';
 import type {StackCursor} from './ReactFiberStack.old';
 import type {Lanes} from './ReactFiberLane.old';
+import type {SharedQueue} from './ReactUpdateQueue.old';
 
 import {isPrimaryRenderer} from './ReactFiberHostConfig';
 import {createCursor, push, pop} from './ReactFiberStack.old';
@@ -31,7 +32,7 @@ import {
 
 import invariant from 'shared/invariant';
 import is from 'shared/objectIs';
-import {createUpdate, enqueueUpdate, ForceUpdate} from './ReactUpdateQueue.old';
+import {createUpdate, ForceUpdate} from './ReactUpdateQueue.old';
 import {markWorkInProgressReceivedUpdate} from './ReactFiberBeginWork.old';
 import {enableSuspenseServerRenderer} from 'shared/ReactFeatureFlags';
 
@@ -211,16 +212,30 @@ export function propagateContextChange<T>(
 
           if (fiber.tag === ClassComponent) {
             // Schedule a force update on the work-in-progress.
-            const update = createUpdate(
-              NoTimestamp,
-              pickArbitraryLane(renderLanes),
-            );
+            const lane = pickArbitraryLane(renderLanes);
+            const update = createUpdate(NoTimestamp, lane);
             update.tag = ForceUpdate;
             // TODO: Because we don't have a work-in-progress, this will add the
             // update to the current fiber, too, which means it will persist even if
             // this render is thrown away. Since it's a race condition, not sure it's
             // worth fixing.
-            enqueueUpdate(fiber, update);
+
+            // Inlined `enqueueUpdate` to remove interleaved update check
+            const updateQueue = fiber.updateQueue;
+            if (updateQueue === null) {
+              // Only occurs if the fiber has been unmounted.
+            } else {
+              const sharedQueue: SharedQueue<any> = (updateQueue: any).shared;
+              const pending = sharedQueue.pending;
+              if (pending === null) {
+                // This is the first update. Create a circular list.
+                update.next = update;
+              } else {
+                update.next = pending.next;
+                pending.next = update;
+              }
+              sharedQueue.pending = update;
+            }
           }
           fiber.lanes = mergeLanes(fiber.lanes, renderLanes);
           const alternate = fiber.alternate;

packages/react-reconciler/src/ReactFiberReconciler.old.js

@@ -318,7 +318,7 @@ export function updateContainer(
     update.callback = callback;
   }
 
-  enqueueUpdate(current, update);
+  enqueueUpdate(current, update, lane);
   const root = scheduleUpdateOnFiber(current, lane, eventTime);
   if (root !== null) {
     entangleTransitions(root, current, lane);

packages/react-reconciler/src/ReactFiberThrow.old.js

@@ -293,7 +293,7 @@ function throwException(
               // prevent a bail out.
               const update = createUpdate(NoTimestamp, SyncLane);
               update.tag = ForceUpdate;
-              enqueueUpdate(sourceFiber, update);
+              enqueueUpdate(sourceFiber, update, SyncLane);
             }
           }
 

packages/react-reconciler/src/ReactFiberWorkLoop.old.js

@@ -34,7 +34,6 @@ import {
   disableSchedulerTimeoutInWorkLoop,
   enableDoubleInvokingEffects,
   skipUnmountedBoundaries,
-  enableDiscreteEventMicroTasks,
 } from 'shared/ReactFeatureFlags';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
 import invariant from 'shared/invariant';
@@ -207,6 +206,7 @@ import {
   pop as popFromStack,
   createCursor,
 } from './ReactFiberStack.old';
+import {enqueueInterleavedUpdates} from './ReactFiberInterleavedUpdates.old';
 
 import {
   markNestedUpdateScheduled,
@@ -217,6 +217,7 @@ import {
   syncNestedUpdateFlag,
 } from './ReactProfilerTimer.old';
 
+import {enableDiscreteEventMicroTasks} from 'shared/ReactFeatureFlags';
 // DEV stuff
 import getComponentName from 'shared/getComponentName';
 import ReactStrictModeWarnings from './ReactStrictModeWarnings.old';
@@ -537,6 +538,7 @@ export function scheduleUpdateOnFiber(
     }
   }
 
+  // TODO: Consolidate with `isInterleavedUpdate` check
   if (root === workInProgressRoot) {
     // Received an update to a tree that's in the middle of rendering. Mark
     // that there was an interleaved update work on this root. Unless the
@@ -674,6 +676,22 @@ function markUpdateLaneFromFiberToRoot(
   }
 }
 
+export function isInterleavedUpdate(fiber: Fiber, lane: Lane) {
+  return (
+    // TODO: Optimize slightly by comparing to root that fiber belongs to.
+    // Requires some refactoring. Not a big deal though since it's rare for
+    // concurrent apps to have more than a single root.
+    workInProgressRoot !== null &&
+    (fiber.mode & BlockingMode) !== NoMode &&
+    // If this is a render phase update (i.e. UNSAFE_componentWillReceiveProps),
+    // then don't treat this as an interleaved update. This pattern is
+    // accompanied by a warning but we haven't fully deprecated it yet. We can
+    // remove once the deferRenderPhaseUpdateToNextBatch flag is enabled.
+    (deferRenderPhaseUpdateToNextBatch ||
+      (executionContext & RenderContext) === NoContext)
+  );
+}
+
 // Use this function to schedule a task for a root. There's only one task per
 // root; if a task was already scheduled, we'll check to make sure the priority
 // of the existing task is the same as the priority of the next level that the
@@ -1376,6 +1394,8 @@ function prepareFreshStack(root: FiberRoot, lanes: Lanes) {
   workInProgressRootUpdatedLanes = NoLanes;
   workInProgressRootPingedLanes = NoLanes;
 
+  enqueueInterleavedUpdates();
+
   if (enableSchedulerTracing) {
     spawnedWorkDuringRender = null;
   }
@@ -2307,7 +2327,7 @@ function captureCommitPhaseErrorOnRoot(
 ) {
   const errorInfo = createCapturedValue(error, sourceFiber);
   const update = createRootErrorUpdate(rootFiber, errorInfo, (SyncLane: Lane));
-  enqueueUpdate(rootFiber, update);
+  enqueueUpdate(rootFiber, update, (SyncLane: Lane));
   const eventTime = requestEventTime();
   const root = markUpdateLaneFromFiberToRoot(rootFiber, (SyncLane: Lane));
   if (root !== null) {
@@ -2354,7 +2374,7 @@ export function captureCommitPhaseError(
           errorInfo,
           (SyncLane: Lane),
         );
-        enqueueUpdate(fiber, update);
+        enqueueUpdate(fiber, update, (SyncLane: Lane));
         const eventTime = requestEventTime();
         const root = markUpdateLaneFromFiberToRoot(fiber, (SyncLane: Lane));
         if (root !== null) {