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In InferReferenceEffects we used `InstructionValue` as the key to represent values, since each time we process an instruction this object will be the same. However this was always a bit of a hack, and in the new model and InferMutationAliasingEffects we can instead use the (creation) effect as the stable value. This avoids an extra layer of memoization since the effects are already interned anyway.
… functions
If you have a local helper function that itself returns a function (`() => () => { ... }`), we currently infer the return effect of the outer function as `Create mutable`. We correctly track the aliasing, but we lose some precision because we don't understand that a function specifically is being returned.
Here, we do some extra analysis of which values are returned in InferMutationAliasingRanges, and if the sole return value is a function we infer a `CreateFunction` effect. We also infer an `Assign` (instead of a Create) if the sole return value was one of the context variables or parameters.
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Mirror of facebook/react#33642
Original author: josephsavona
If you have a local helper function that itself returns a function (
() => () => { ... }), we currently infer the return effect of the outer function asCreate mutable. We correctly track the aliasing, but we lose some precision because we don't understand that a function specifically is being returned.Here, we do some extra analysis of which values are returned in InferMutationAliasingRanges, and if the sole return value is a function we infer a
CreateFunctioneffect. We also infer anAssign(instead of a Create) if the sole return value was one of the context variables or parameters.Stack created with Sapling. Best reviewed with ReviewStack.