[compiler] Recognize that refs are stable #30679
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…n dependency is a ref Summary: In theory, as I understand it, the result of a useRef will never change between renders, because we'll always provide the same ref value consistently. That means that memoization that depends on a ref value will never re-compute, so I think we could not infer it as a dependency in Forget. This diff, however, doesn't do that: it instead allows the validatePreserveExistingMemoizationGuarantees analysis to admit mismatches between explicit dependencies and implicit ones when the implicit dependency is a ref that doesn't exist in source. [ghstack-poisoned]
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mvitousek
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Aug 13, 2024
…n dependency is a ref Summary: In theory, as I understand it, the result of a useRef will never change between renders, because we'll always provide the same ref value consistently. That means that memoization that depends on a ref value will never re-compute, so I think we could not infer it as a dependency in Forget. This diff, however, doesn't do that: it instead allows the validatePreserveExistingMemoizationGuarantees analysis to admit mismatches between explicit dependencies and implicit ones when the implicit dependency is a ref that doesn't exist in source. ghstack-source-id: 5cd2aa1 Pull Request resolved: #30679
| return; | ||
| } | ||
| } | ||
| let errorDiagnostic: CompareDependencyResult | null = null; |
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nit: move the let errorDiagnostic ... down since it's unrelated to the new if block
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One thing to note is that it's possible to have a reactive ref:
const ref1 = useRef(..);
const ref2 = useRef(..);
const ref = props.cond ? ref1 : ref2;
...in which case we wouldn't want to prune ref as dependency in a subsequent reactive-scope/memo-block. In practice this is very rare, but unless we guard against that case the change here isn't 100% safe.
…ization when dependency is a ref" Summary: In theory, as I understand it, the result of a useRef will never change between renders, because we'll always provide the same ref value consistently. That means that memoization that depends on a ref value will never re-compute, so I think we could not infer it as a dependency in Forget. This diff, however, doesn't do that: it instead allows the validatePreserveExistingMemoizationGuarantees analysis to admit mismatches between explicit dependencies and implicit ones when the implicit dependency is a ref that doesn't exist in source. [ghstack-poisoned]
mvitousek
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Aug 13, 2024
…n dependency is a ref Summary: In theory, as I understand it, the result of a useRef will never change between renders, because we'll always provide the same ref value consistently. That means that memoization that depends on a ref value will never re-compute, so I think we could not infer it as a dependency in Forget. This diff, however, doesn't do that: it instead allows the validatePreserveExistingMemoizationGuarantees analysis to admit mismatches between explicit dependencies and implicit ones when the implicit dependency is a ref that doesn't exist in source. ghstack-source-id: a8e56b5 Pull Request resolved: #30679
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@josephsavona Good catch! I pulled this thread a little more and realized that we already have the technology to mark useRef results as non-reactive at their point of creation (the |
…ization when dependency is a ref" Summary: In theory, as I understand it, the result of a useRef will never change between renders, because we'll always provide the same ref value consistently. That means that memoization that depends on a ref value will never re-compute, so I think we could not infer it as a dependency in Forget. This diff, however, doesn't do that: it instead allows the validatePreserveExistingMemoizationGuarantees analysis to admit mismatches between explicit dependencies and implicit ones when the implicit dependency is a ref that doesn't exist in source. [ghstack-poisoned]
mvitousek
added a commit
that referenced
this pull request
Aug 13, 2024
…n dependency is a ref Summary: In theory, as I understand it, the result of a useRef will never change between renders, because we'll always provide the same ref value consistently. That means that memoization that depends on a ref value will never re-compute, so I think we could not infer it as a dependency in Forget. This diff, however, doesn't do that: it instead allows the validatePreserveExistingMemoizationGuarantees analysis to admit mismatches between explicit dependencies and implicit ones when the implicit dependency is a ref that doesn't exist in source. ghstack-source-id: 01f0078 Pull Request resolved: #30679
…ization when dependency is a ref" Summary: In theory, as I understand it, the result of a useRef will never change between renders, because we'll always provide the same ref value consistently. That means that memoization that depends on a ref value will never re-compute, so I think we could not infer it as a dependency in Forget. This diff, however, doesn't do that: it instead allows the validatePreserveExistingMemoizationGuarantees analysis to admit mismatches between explicit dependencies and implicit ones when the implicit dependency is a ref that doesn't exist in source. [ghstack-poisoned]
mvitousek
added a commit
that referenced
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Aug 13, 2024
…n dependency is a ref Summary: In theory, as I understand it, the result of a useRef will never change between renders, because we'll always provide the same ref value consistently. That means that memoization that depends on a ref value will never re-compute, so I think we could not infer it as a dependency in Forget. This diff, however, doesn't do that: it instead allows the validatePreserveExistingMemoizationGuarantees analysis to admit mismatches between explicit dependencies and implicit ones when the implicit dependency is a ref that doesn't exist in source. ghstack-source-id: 685d859 Pull Request resolved: #30679
…ization when dependency is a ref" Summary: In theory, as I understand it, the result of a useRef will never change between renders, because we'll always provide the same ref value consistently. That means that memoization that depends on a ref value will never re-compute, so I think we could not infer it as a dependency in Forget. This diff, however, doesn't do that: it instead allows the validatePreserveExistingMemoizationGuarantees analysis to admit mismatches between explicit dependencies and implicit ones when the implicit dependency is a ref that doesn't exist in source. [ghstack-poisoned]
mvitousek
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mvitousek
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Aug 14, 2024
…n dependency is a ref Summary: In theory, as I understand it, the result of a useRef will never change between renders, because we'll always provide the same ref value consistently. That means that memoization that depends on a ref value will never re-compute, so I think we could not infer it as a dependency in Forget. This diff, however, doesn't do that: it instead allows the validatePreserveExistingMemoizationGuarantees analysis to admit mismatches between explicit dependencies and implicit ones when the implicit dependency is a ref that doesn't exist in source. ghstack-source-id: 685d859 Pull Request resolved: #30679
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Stack from ghstack (oldest at bottom):
Summary:
In theory, as I understand it, the result of a useRef will never change between renders, because we'll always provide the same ref value consistently. We can mark useRef as producing a stable value to get better memoization