This repository contains some example code that demonstrates how to load and link a Mach-O bundle in memory on OSX, and call a function from it. This can be useful for building software that needs to dynamically load new code in memory at runtime.
The key functions to read up on are NSCreateObjectFileImageFromMemory and NSLinkModule. Once the NSModule is loaded and linked, you can locate symbols using NSLookupSymbolInModule, and resolve the address to it with NSAddressOfSymbol. Then you can cast that to whatever type you need.
[ λ ~/dev/BundleLoader ] make
[*] Cleaning
[*] Building loader (debug)
[*] Building test module
[ λ ~/dev/BundleLoader ] build/loader build/testmod _CallMe
[*] Created object file image from memory blob
[*] Linked module in memory
[*] Located function symbol at 0x100cedf50
Hello from CallMe
[*] Called _CallMe, return value was 99
[ λ ~/dev/BundleLoader ]