I'm looking for all code that uses the is-Swift bit in class metadata. Uses that I know of: * Compiler-generated class metadata (addClassDataPointer() in GenMeta.cpp) * Runtime metadata checks (isTypeMetadata() inMetadata.h) * Stuff in lldb and other debugging tools * Stuff in the Objective-C runtime
Is there any other code that reads or writes this bit? Does compiler-generated code ever do so? Or maybe something in reflection that I haven't found? (Backstory: The forthcoming stable Swift ABI will need to use a different bit to avoid collisions with existing pre-stable-ABI Swift apps. We will need to find all of these locations and change them.) -- Greg Parker gpar...@apple.com <mailto:gpar...@apple.com> Runtime Wrangler
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