Update time hook (#225)

Author: noahsmartin

Package.swift

@@ -37,7 +37,7 @@ let package = Package(
     dependencies: [
       .package(url: "https://github.com/swhitty/FlyingFox.git", exact: "0.16.0"),
       .package(url: "https://github.com/EmergeTools/AccessibilitySnapshot.git", exact: "1.0.2"),
-      .package(url: "https://github.com/EmergeTools/SimpleDebugger.git", branch: "main"),
+      .package(url: "https://github.com/EmergeTools/SimpleDebugger.git", exact: "1.0.0"),
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.

Sources/SnapshottingTestsObjc/EMGInvocationCreator.mm

@@ -42,27 +42,18 @@ int gettimeofday_new(struct timeval *t, void *a) {
   return 0;
 }
 
-void callback(mach_port_t thread, arm_thread_state64_t state, std::function<void(bool removeBreak)> a) {
-  state.__pc = (__uint64_t) &gettimeofday_new;
-  thread_set_state(thread, ARM_THREAD_STATE64, (thread_state_t) &state, ARM_THREAD_STATE64_COUNT);
-  a(false);
-}
-
 #endif
 
 + (void)hookTime {
 #if EMG_ENABLE_FIX_TIME
-  vm_address_t a = (vm_address_t) &gettimeofday;
   handler = new SimpleDebugger();
-  handler->setBreakpoint(a);
-  handler->setExceptionCallback(&callback);
-  handler->startDebugging();
+  handler->hookFunction((void *) &gettimeofday, (void *) &gettimeofday_new);
 #endif
 }
 
 + (void)load {
   NSDictionary<NSString *, NSString *> *env = [[NSProcessInfo processInfo] environment];
-  if ([[env objectForKey:@"EMERGE_SHOULD_FIX_TIME"] isEqualToString:@"1"]) {
+  if (![[env objectForKey:@"EMERGE_DISABLE_FIX_TIME"] isEqualToString:@"1"]) {
     [self hookTime];
   }
   id previewBaseTest = NSClassFromString(@"EMGPreviewBaseTest");