Summary:
The core issue solved in D21389371 was that erased elements of a TinyMap were being iterated over, because TinyMap has somewhat-complicated logic around cleaning out the underlying vector. In some very marginal cases, vectors were not being cleaned and an iterator pointing at erased elements was being returned.
The diff prevents some possible crashes in `begin()` and `find()` while making it much less likely to iterate over erased elements.
We also add a unit test to catch the case fixed in D21389371, in particular.
We also are keeping the code added in D21389371 (for now) since it's a cheap check, and will be a safeguard until we have rigorous testing around TinyMap. To be clear that logic should noop currently, but will prevent crashes in case guarantees around TinyMap change in the future.
Currently there is only one line of code that actually uses the TinyMap iterator, so this should be safe.
Reviewed By: shergin
Differential Revision: D21392762
fbshipit-source-id: 36dc998958c230fad01af93338974f8889cbcf55
Summary:
Update differ test so it passes again. Previously to D21111423 (I think) nodes were being incorrectly detected as updated even if they weren't different, so now there are fewer unnecessary Update mutations generated.
Changelog: [Internal]
Reviewed By: mdvacca
Differential Revision: D21148647
fbshipit-source-id: cab6e3ecd0a457e1ac3155b3468bcc56663dab0b
Summary:
This pull request changes the include of Glog from `<Glog/logging.h>` to `<glog/logging.h>` in `MountingTest.cpp`. This fixes building on a case-sensitive filesystem.
## Changelog
[Internal] [Fixed] - Fabric: Fix case of Glog include in MountingTest.cpp
Pull Request resolved: https://github.com/facebook/react-native/pull/28616
Test Plan: The `include` of Glog no longer causes issues with building `MountingTest.cpp` on a case-sensitive filesystem.
Differential Revision: D21118085
Pulled By: shergin
fbshipit-source-id: c958c54bf88333fd5001127779c855ce8c2666c3
Summary:
The differ was still producing correct, but not minimal, instruction sets in some cases due to an optimization that was buggy.
This affected cases where 2+ nodes were inserted at the beginning of a list. It would trigger the old behavior where all nodes after the first would be removed, deleted, then reinserted.
See the test case (which was failing and now passed) and P128190998 (the 3->4 transition) for samples.
Changelog: [Internal] Fabric differ
Reviewed By: mdvacca
Differential Revision: D20785729
fbshipit-source-id: 2fea6a816753066abb358ed7bb51003140cd5fc4
Summary:
Two things:
1) I reimplement Valentin's idea in D19965405, so that TinyMaps can be iterated over, with a couple of bugfixes (calling front() or back() on an empty vector will crash).
2) I now use TinyMap instead of better::map in the "optimized" diffing algorithm.
3) `erase` now actually removes elements from the vector, but only when more than half of elements have been erased.
4) If you repeatedly erase elements at the beginning of the vector, they will no longer be iterated over. This is a specific optimization for our heaviest TinyMap use-cases.
These amount to some small but hopefully somewhat meaningful perf improvements.
Changelog: [Internal] Fabric perf
Reviewed By: shergin
Differential Revision: D20718719
fbshipit-source-id: 91f4b2e2e0f6387ae484e43d5b0095103087baa6
Summary:
This unit test is to verify that the new diffing algorithm generates a "minimal" instruction set, with regards to removes and inserts ("moves").
These unit tests are here to verify the expected behavior in this new algorithm, but these tests may be modified or deleted in the future if we decide we want to change this behavior.
Changelog: [Internal] fabric unit test
Reviewed By: mdvacca
Differential Revision: D20706592
fbshipit-source-id: 5f9991498e0d788ecbf88d938bfe6d3f0f27af40
Summary:
ShadowView, ShadowViewMutation, and Differentiator were decoupled to separate module.
That enables us to use ShadowView more widely without facing a circular dependency problem.
Reviewed By: mdvacca
Differential Revision: D13205229
fbshipit-source-id: 7373864bf153a7813c2f97edb263a41454ce0b88
Samuel Susla
Joshua Gross
empyrical
Andres Suarez
Valentin Shergin