Symbols missing for some macOS 12 system libraries on arm64

[mstange]

For example there are no symbols for /usr/lib/system/libsystem_malloc.dylib.

[mstange]

Looking into this more, I can observe the following:

• I can successfully get symbols for the .1 chunk, e.g. /System/Library/dyld/dyld_shared_cache_arm64e.1 /System/Library/PrivateFrameworks/GameCenterUI.framework/Versions/A/GameCenterUI
• I can successfully get symbols for the zero chunk (the one without extension) for x86_64 but not for arm64e.
• For libraries in /System/Library/dyld/dyld_shared_cache_arm64e, i.e. the arm64e zero chunk, I get the correct list of symbols but the symbol name strings are all invalid.

So maybe there's a string table offset for the zero chunk that I need to respect.

[mstange]

It looks like the string table for libraries in the arm64e chunk is actually in the arm64e.1 chunk.

[mstange]

... because that's where the __LINKEDIT section was placed. So the MachOFile needs to read from two different input data streams. There's currently no API for that in the object crate.

[mstange]

Support for this format has now landed in gimli-rs/object#398. Once a new object release is available, we just need to update to it and this should work.

[mstange]

This was fixed in d1c8fd6.