Use JIT on iOS (not actually working yet, but it will start working i…

…n later commits)

ios/ViewController.mm

@@ -99,7 +99,7 @@ -(id) init {
 
 		ram_temp_file = [[NSTemporaryDirectory() stringByAppendingPathComponent:@"ram_tmp.file"] fileSystemRepresentation];
 
-		iosCanUseJit = false;
+		iosCanUseJit = true;
 		targetIsJailbroken = false;
 		NSArray *jailPath = [NSArray arrayWithObjects:
 							@"/Applications/Cydia.app",
@@ -112,11 +112,6 @@ -(id) init {
 			if ([[NSFileManager defaultManager] fileExistsAtPath:string]) {
 				// checking device jailbreak status in order to determine which message to show in GameSettingsScreen
 				targetIsJailbroken = true;
-				// if we're running on iOS arm64, only iOS <9 is supported with JIT.
-				// if we're running on anything that isn't arm64, then JIT is supported on all iOS versions.
-				if (![self isArm64] || ([self isArm64] && kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber_IOS_9_0)) {
-					iosCanUseJit = true;
-				}
 			}
 		}
 

ios/main.mm

@@ -94,6 +94,8 @@ void Vibrate(int length_ms) {
 
 int main(int argc, char *argv[])
 {
+  // Simulates a debugger. Makes it possible to use JIT (though only W^X)
+  syscall(SYS_ptrace, 0 /*PTRACE_TRACEME*/, 0, 0, 0);
 	@autoreleasepool {
 		return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
 	}