This article aims to describe how to hook Swift functions.
Thanks to help from @NightwindDev for discussion and testing.
Overall, the idea is simple:
Write our own Swift code that will have the same calling convention as the target code,
then get a pointer to our own code and the target code, and call MSHookFunction with
these values.
| #import <Foundation/Foundation.h> | |
| #import <mach-o/loader.h> | |
| #if __has_include(<Kernel/kern/cs_blobs.h>) | |
| # import <Kernel/kern/cs_blobs.h> | |
| #else | |
| /* some Darwin distributions don't provide the cs_blobs header | |
| * copy it from the macOS SDK if available, otherwise one of | |
| * https://opensource.apple.com/source/xnu/xnu-4903.221.2/osfmk/kern/cs_blobs.h.auto.html | |
| * https://github.com/apple/darwin-xnu/blob/a449c6a3b8014d9406c2ddbdc81795da24aa7443/osfmk/kern/cs_blobs.h |