[6.2][IRGen] Fix placeholder logic for emission of conditionally inverted protocols #82352
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Contributor
drexin
commented
Jun 18, 2025
drexin
commented
- Explanation: Instead of counting the actual conformances, the logic took the size of the bit field, i.e. used the highest set bit, so when a type had a conditional conformance only on ~Escapable, but not on ~Copyable, it would still add 2 placeholders, but only fill one.
- Scope: Metadata emission for types with conditional conformance on inverted protocols
- Issues: rdar://153681688
- Original PRs: [IRGen] Fix placeholder logic for emission of conditionally inverted … #82347
- Risk: Low. Issue is affecting a very specific case and the fix is tested.
- Testing: Added validation test that observes the issue before the fix and not after.
- Reviewers: @meg-gupta
…protocols rdar://153681688 Instead fo counting the actual conformances, the logic took the size of the bit field, i.e. used the highest set bit, so when a type had a conditional conformance only on ~Escapable, but not on ~Copyable, it would still add 2 placeholders, but only fill one.
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