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[Runtime] Check the weak-linked _dyld_has_preoptimized_swift_protocol_conformances for NULL before calling it.

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rdar://89522018
This commit is contained in:
Mike Ash
2022-03-02 14:21:25 -05:00
parent 10b5031e93
commit d61fee3884
1 changed files with 2 additions and 1 deletions
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3
stdlib/public/runtime/ProtocolConformance.cpp
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@@ -581,7 +581,8 @@ void swift::addImageProtocolConformanceBlockCallbackUnsafe(
ConformanceSection{conformances, conformancesSize});
return;
#if DYLD_FIND_PROTOCOL_ON_DISK_CONFORMANCE_DEFINED
} else if (_dyld_has_preoptimized_swift_protocol_conformances(
} else if (&_dyld_has_preoptimized_swift_protocol_conformances &&
_dyld_has_preoptimized_swift_protocol_conformances(
reinterpret_cast<const mach_header *>(baseAddress))) {
// dyld may optimize images outside the shared cache. Skip those too.
DYLD_CONFORMANCES_LOG(