Fix useMemoCache with setState in render #30889
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Fixes the bug that alexmckenley and mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. [ghstack-poisoned]
josephsavona
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that referenced
this pull request
Sep 5, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: b3e3b82 Pull Request resolved: #30889
Fixes the bug that alexmckenley and mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. [ghstack-poisoned]
josephsavona
added a commit
that referenced
this pull request
Sep 5, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: a71a783 Pull Request resolved: #30889
Fixes the bug that alexmckenley and mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. [ghstack-poisoned]
josephsavona
added a commit
that referenced
this pull request
Sep 5, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: 62875e6 Pull Request resolved: #30889
Fixes the bug that alexmckenley and mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. [ghstack-poisoned]
josephsavona
added a commit
that referenced
this pull request
Sep 5, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: 8bab4b4 Pull Request resolved: #30889
Fixes the bug that alexmckenley and mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. [ghstack-poisoned]
josephsavona
added a commit
that referenced
this pull request
Sep 5, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: 4c6350a Pull Request resolved: #30889
…r on "Fix useMemoCache with setState in render" Fixes the bug that alexmckenley and mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. [ghstack-poisoned]
josephsavona
added a commit
that referenced
this pull request
Sep 5, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: 4d25c92 Pull Request resolved: #30889
josephsavona
commented
Sep 5, 2024
Comment on lines
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| // Because we clone/reset the memo cache after every aborted attempt, we | ||
| // must process the first chunk again. | ||
| // | ||
| // That's three total times we've processed the first chunk, compared to | ||
| // just once when enableNoCloningMemoCache is on. |
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looks like this reset was just an artifact of the renderWithHooksAgain() reset. so the feature flag helps, but a bit less than we expected (we process the chunk once instead of twice)
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Hmm nope, more complicated than that. Tests seem to be failing on persistent mode with this change, still debugging.
Fixes the bug that alexmckenley and mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. [ghstack-poisoned]
josephsavona
added a commit
that referenced
this pull request
Sep 6, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: d0508ab Pull Request resolved: #30889
Fixes the bug that alexmckenley and mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. [ghstack-poisoned]
josephsavona
added a commit
that referenced
this pull request
Sep 6, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: 57608c8 Pull Request resolved: #30889
Fixes the bug that alexmckenley and mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. [ghstack-poisoned]
josephsavona
added a commit
that referenced
this pull request
Sep 6, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: ab48eac Pull Request resolved: #30889
Fixes the bug that alexmckenley and mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. [ghstack-poisoned]
josephsavona
added a commit
that referenced
this pull request
Sep 6, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: 50bf0ce Pull Request resolved: #30889
…tate in render" Fixes the bug that alexmckenley and mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. [ghstack-poisoned]
josephsavona
added a commit
that referenced
this pull request
Sep 6, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: fc0947c Pull Request resolved: #30889
josephsavona
commented
Sep 6, 2024
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| } | ||
| const lastEffect = componentUpdateQueue.lastEffect; | ||
| if (lastEffect === null) { | ||
| componentUpdateQueue.lastEffect = effect.next = effect; | ||
| } else { | ||
| const lastEffect = componentUpdateQueue.lastEffect; | ||
| if (lastEffect === null) { | ||
| componentUpdateQueue.lastEffect = effect.next = effect; | ||
| } else { | ||
| const firstEffect = lastEffect.next; | ||
| lastEffect.next = effect; | ||
| effect.next = firstEffect; | ||
| componentUpdateQueue.lastEffect = effect; | ||
| } | ||
| const firstEffect = lastEffect.next; | ||
| lastEffect.next = effect; | ||
| effect.next = firstEffect; | ||
| componentUpdateQueue.lastEffect = effect; |
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drive by cleanup since i was here
josephsavona
added a commit
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Sep 6, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: fc0947c Pull Request resolved: #30889
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Sep 6, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: fc0947c Pull Request resolved: #30889 DiffTrain build for commit 727b361.
github-actions bot
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Sep 6, 2024
Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render. The fix here is to call a new helper function to clear the update queue. It nulls out other properties, but for memoCache it just sets the index back to zero. ghstack-source-id: fc0947c Pull Request resolved: #30889 DiffTrain build for [727b361](727b361)
This was referenced Sep 9, 2024
gnoff
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Sep 12, 2024
**breaking change for canary users: Bumps peer dependency of React from `19.0.0-rc-7771d3a7-20240827` to `19.0.0-rc-94e652d5-20240912`** [diff facebook/react@7771d3a7...94e652d5](facebook/react@7771d3a...94e652d) <details> <summary>React upstream changes</summary> - facebook/react#30952 - facebook/react#30950 - facebook/react#30946 - facebook/react#30934 - facebook/react#30947 - facebook/react#30945 - facebook/react#30938 - facebook/react#30936 - facebook/react#30879 - facebook/react#30888 - facebook/react#30931 - facebook/react#30930 - facebook/react#30832 - facebook/react#30929 - facebook/react#30926 - facebook/react#30925 - facebook/react#30905 - facebook/react#30900 - facebook/react#30910 - facebook/react#30906 - facebook/react#30899 - facebook/react#30919 - facebook/react#30708 - facebook/react#30907 - facebook/react#30897 - facebook/react#30896 - facebook/react#30895 - facebook/react#30887 - facebook/react#30889 - facebook/react#30893 - facebook/react#30892 - facebook/react#30891 - facebook/react#30882 - facebook/react#30881 - facebook/react#30870 - facebook/react#30849 - facebook/react#30878 - facebook/react#30865 - facebook/react#30869 - facebook/react#30875 - facebook/react#30800 - facebook/react#30762 - facebook/react#30831 - facebook/react#30866 - facebook/react#30853 - facebook/react#30850 - facebook/react#30847 - facebook/react#30842 - facebook/react#30837 - facebook/react#30848 - facebook/react#30844 - facebook/react#30839 - facebook/react#30802 - facebook/react#30841 - facebook/react#30827 - facebook/react#30826 - facebook/react#30825 - facebook/react#30824 - facebook/react#30840 - facebook/react#30838 - facebook/react#30836 - facebook/react#30819 - facebook/react#30816 - facebook/react#30814 - facebook/react#30813 - facebook/react#30812 - facebook/react#30811 </details> --------- Co-authored-by: vercel-release-bot <[email protected]>
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Fixes the bug that @alexmckenley and @mofeiZ found where setState-in-render can reset useMemoCache and cause an infinite loop. The bug was that renderWithHooksAgain() was not resetting hook state when rerendering (so useMemo values were preserved) but was resetting the updateQueue. This meant that the entire memo cache was cleared on a setState-in-render.
I initially changed renderWithHooksAgain() to just reset the updateQueue, nulling out properties and setting the memoCache.index back to 0, but not clearing memoCache.data. That fixed the uMC bug, but caused some tests to fail where effect cleanup wasn’t running when a component was in a tree that suspended and showed a fallback.
Turns out renderWithHooksAgain() is also used to re-render suspended components, and that case depends on the updateQueue being cleared for effects to work correctly. So i updated to clear the updateQueue for the suspense case, reset in the setState-in-render case, and everything works. The result feels pretty clean.
In a follow-up we should be able to avoid resetting the memo cache in the replay case as well. There are a few spots in the codebase where we check for
updateQueue === null, and only do processing in that case — including some code related to effect cleanup. I think the right thing to do there would be to check for e.g.updateQueue?.lastEffect == null(and any other relevant properties from updateQueue), and then it would be safe to always reset the updateQueue instead of clearing it.