search for: _read_images

...d: Dispatch queue: com.apple.main-thread 0 libobjc.A.dylib 0x913d3348 _objc_search_builtins + 299 1 libobjc.A.dylib 0x913d313e __sel_registerName + 44 2 libobjc.A.dylib 0x913d6269 map_method_descs + 47 3 libobjc.A.dylib 0x913d4094 _read_images + 2116 4 libobjc.A.dylib 0x913e9933 map_images_nolock + 1545 5 libobjc.A.dylib 0x913d30d9 map_images + 72 6 dyld 0x8fe03ecc dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_inf...

...ing generated. # ./foo Segmentation fault Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_INVALID_ADDRESS at address: 0x6e697970 #0 0x913d3348 in _objc_search_builtins () #1 0x913d313e in __sel_registerName () #2 0x913d6269 in map_method_descs () #3 0x913d4094 in _read_images () #4 0x913e9933 in map_images_nolock () #5 0x913d30d9 in map_images () #6 0x8fe03ecc in __dyld__ZN4dyldL18notifyBatchPartialE17dyld_image_statesbPFPKcS0_jPK15dyld_image_infoE () #7 0x8fe04359 in __dyld__ZN4dyld36registerImageStateBatchChangeHandlerE17dyld_image_statesPFPKcS0_jPK15dyld_image_in...

...to help out someone who wants to do this. It would be nice to get this working without embedding any of Objective-C to the host process this is why I am particularly interested in knowing how to do the work that objc4 does in the methods such as: objc4/_objc_init, objc4/map_images_nolock and objc4/_read_images. My understanding of the goal is to make the lli example from this thread working: https://stackoverflow.com/questions/10375324/all-selectors-unrecognised-when-invoking-objective-c-methods-using-the-llvm-exec. I would be happy to get a hint on which functions of Objective-C Runtime's public A...

On 12 Feb 2018, at 22:31, Stanislav Pankevich via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > Specifically I explored the latest objc4-723 > from Apple Open Source and it looks like all of the APIs that allow > the registration of Objective-C classes, selectors, etc. are all very > private. The Objective-C runtime provides public APIs for doing all of this. They’re

...embedding any of > Objective-C to the host process this is It’s an optimisation, not a compulsory part of the process. > why I am particularly > interested in knowing how to do the work that objc4 does in the > methods such as: objc4/_objc_init, objc4/map_images_nolock and > objc4/_read_images. > > My understanding of the goal is to make the lli example from this > thread working: > https://stackoverflow.com/questions/10375324/all-selectors-unrecognised-when-invoking-objective-c-methods-using-the-llvm-exec. > > I would be happy to get a hint on which functions of Obje...

...C to the host process this is > > It’s an optimisation, not a compulsory part of the process. > > > why I am particularly > > interested in knowing how to do the work that objc4 does in the > > methods such as: objc4/_objc_init, objc4/map_images_nolock and > > objc4/_read_images. > > > > My understanding of the goal is to make the lli example from this > > thread working: > > https://stackoverflow.com/questions/10375324/all- > selectors-unrecognised-when-invoking-objective-c-methods- > using-the-llvm-exec. > > > > I would be happy...

...s >> >> It’s an optimisation, not a compulsory part of the process. >> >> > why I am particularly >> > interested in knowing how to do the work that objc4 does in the >> > methods such as: objc4/_objc_init, objc4/map_images_nolock and >> > objc4/_read_images. >> > >> > My understanding of the goal is to make the lli example from this >> > thread working: >> > >> > https://stackoverflow.com/questions/10375324/all-selectors-unrecognised-when-invoking-objective-c-methods-using-the-llvm-exec. >> > >&...

...an optimisation, not a compulsory part of the process. > >> > >> > why I am particularly > >> > interested in knowing how to do the work that objc4 does in the > >> > methods such as: objc4/_objc_init, objc4/map_images_nolock and > >> > objc4/_read_images. > >> > > >> > My understanding of the goal is to make the lli example from this > >> > thread working: > >> > > >> > https://stackoverflow.com/questions/10375324/all- > selectors-unrecognised-when-invoking-objective-c-methods- > usi...

Thanks for the info! Yes, the problem is certainly that the JITed code isn't registering its classes, but even after digging through all the runtime code I can't find anything that seems suitable for doing this.. The nearest function I could find was _objc_init_image, but that seems to be for win32! I assume that the way it works must be that clang creates some static data structures