The way the composeEpoxyModel function was written it would create a function that looked like this (in decompiled dex bytecode (for readability compiled to Java))
public static final ComposeEpoxyModel composeEpoxyModel(String id, Object[] keys, Function2<? super Composer, ? super Integer, Unit> composeFunction) {
...
ComposeEpoxyModel $this$composeEpoxyModel_u24lambda_u240 = new ComposeEpoxyModel(Arrays.copyOf(keys, keys.length), composeFunction);
$this$composeEpoxyModel_u24lambda_u240.id(id);
return $this$composeEpoxyModel_u24lambda_u240;
}
this would trigger a ART bug in the (non mainline patched version of Android 12) to optimize the this line away
This works around this issue by making sure that the creation, setting the id and adding to the controller of a ComposeEpoxyModel is happening in the same location in compiled bytecode.
Note: If you run R8 with optimization enabled, the method outlining optimization might still outline some of that inlined code again and thus still cause this problem but that is a different issue that can be dealt with by disabling outlining or all optimization.
The way the
composeEpoxyModelfunction was written it would create a function that looked like this (in decompiled dex bytecode (for readability compiled to Java))this would trigger a ART bug in the (non mainline patched version of Android 12) to optimize the this line away
and lead to crashes on Android 12.
More background at: https://github.com/airbnb/epoxy/issues/1199 and https://issuetracker.google.com/issues/197818595
This works around this issue by making sure that the creation, setting the id and adding to the controller of a
ComposeEpoxyModelis happening in the same location in compiled bytecode.Note: If you run R8 with optimization enabled, the method outlining optimization might still outline some of that inlined code again and thus still cause this problem but that is a different issue that can be dealt with by disabling outlining or all optimization.