[IRGen] Check as early as possible for Clang decls we've seen before. #31272
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Previously, we were only doing this after the fast-path code that handles decls without any executable code. This meant, however, that we were potentially processing these decls multiple times. This is definitely inefficient; it may even be a correctness issue, depending on what amount of checking `HandleTopLevelDecl` does to see if it has processed a particular decl before (which I'm not sure about either way).
gribozavr
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Apr 24, 2020
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@swift-ci Please test |
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@swift-ci Please test Windows |
aschwaighofer
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Sep 10, 2020
…ang-decl [IRGen] Check as early as possible for Clang decls we've seen before.
aschwaighofer
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Sep 10, 2020
Explanation: LLVM currently asserts on local extern variables in C headers passed to Swift when the definition exists outside that header. Scope: This never worked. Risk: Low. Testing: Regression test added. Reviewed-by: John McCall Original PR: swiftlang#33306 This fix also required the cherry-pick of: swiftlang#31035 and swiftlang#31272 rdar://67951491
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Previously, we were only doing this after the fast-path code that handles decls without any executable code. This meant, however, that we were potentially processing these decls multiple times. This is definitely inefficient; it may even be a correctness issue, depending on what amount of checking
HandleTopLevelDecldoes to see if it has processed a particular decl before (which I'm not sure about either way).