Hook late loaded classes without dlopen'ing anything

LateLoading.xm

#import <objc/runtime.h>

#include <dlfcn.h>
#include <mach-o/dyld.h>

%group NormalHooks

// Regular hooks in here.

%end

%group LateClassOrFrameworkA

// Specific late loaded stuff for Class A or Framework A.

%end

static void tryLateLoadClassA() {
  static dispatch_once_t predicate;

  // Check if Class A is loaded.
  Class lateLoadedClassA = objc_getClass("lateLoadedClassA");
  if (lateLoadedClassA) {
    dispatch_once(&predicate, ^{
        // Initialize hooks for late loaded Class A.
        %init(LateClassOrFrameworkA);
    });
  }
}

static void add_image_callback(const struct mach_header *mh, intptr_t vmaddr_slide) {
  // Try to late load in here.
  tryLateLoadClassA();
}

%ctor {
  %init(NormalHooks);

  _dyld_register_func_for_add_image(&add_image_callback);
}