[6.3] SIL asmname, @c serialization, and calling-convention fixes
#85514
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We have been mangling extern "C" symbols when building with C++ interoperability, leading to incorrectly-mangled names such as _Z6memset that should have been unmangled "memset". Fix this so we get consistent mangling between C and C++ interoperability modes. Fixes rdar://164495210. (cherry picked from commit c02811d)
(cherry picked from commit e423d77)
This eliminates a SIL verification error with `@c` functions, which provide definitions for foreign entrypoints. We were serializing @c definitions when we shouldn't be, which would cause problems down the line if those @c definitions referenced something internal that they shouldn't. (cherry picked from commit b21485d)
This change moves us toward the official feature, and eliminates the extra level of "thunk" that was implied by `@_cdecl`. Amusingly, this trips up the LLVM-level ARC optimizations, because we are trying to perform ARC optimizations within the retain/release runtime functions. Teach those optimization passes to leave swift_retainN et al alone. (cherry picked from commit 9ea8671)
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@swift-ci please test |
nkcsgexi
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Nov 14, 2025
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@swift-ci please test Linux |
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@swift-ci please test Windows |
(cherry picked from commit 7517425)
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@swift-ci please test |
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@swift-ci please test Windows |
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extern "C"functions imported in C++. Another prevents us from incorrectly forcing serialization of the definitions of@cfunctions. A third respects the Swift calling convention on imported C declarations.