Add iOS version detection, turn off JIT on bootup if >= 14.3.

Common/System/System.h

@@ -98,6 +98,8 @@ enum SystemProperty {
 
 	SYSPROP_SUPPORTS_PERMISSIONS,
 	SYSPROP_SUPPORTS_SUSTAINED_PERF_MODE,
+
+	SYSPROP_CAN_JIT,
 };
 
 std::string System_GetProperty(SystemProperty prop);

Qt/QtMain.cpp

@@ -225,6 +225,8 @@ bool System_GetPropertyBool(SystemProperty prop) {
 #else
 		return false;
 #endif
+	case SYSPROP_CAN_JIT:
+		return true;
 	default:
 		return false;
 	}

SDL/SDLMain.cpp

@@ -387,6 +387,8 @@ bool System_GetPropertyBool(SystemProperty prop) {
 #else
 		return false;
 #endif
+	case SYSPROP_CAN_JIT:
+		return true;
 	default:
 		return false;
 	}

UI/DevScreens.cpp

@@ -473,6 +473,8 @@ void SystemInfoScreen::CreateViews() {
 	std::string cores = StringFromFormat(si->T("%d (%d per core, %d cores)"), totalThreads, cpu_info.logical_cpu_count, cpu_info.num_cores);
 	deviceSpecs->Add(new InfoItem(si->T("Threads"), cores));
 #endif
+	deviceSpecs->Add(new InfoItem(si->T("JIT available"), System_GetPropertyBool(SYSPROP_CAN_JIT) ? di->T("Yes") : di->T("No")));
+
 	deviceSpecs->Add(new ItemHeader(si->T("GPU Information")));
 
 	DrawContext *draw = screenManager()->getDrawContext();

UI/NativeApp.cpp

@@ -694,6 +694,12 @@ void NativeInit(int argc, const char *argv[], const char *savegame_dir, const ch
 		}
 	}
 
+	if (System_GetPropertyBool(SYSPROP_CAN_JIT) == false && g_Config.iCpuCore == (int)CPUCore::JIT) {
+		// Just gonna force it to the IR interpreter on startup.
+		// We don't hide the option, but we make sure it's off on bootup. In case someone wants
+		// to experiment in future iOS versions or something...
+		g_Config.iCpuCore = (int)CPUCore::IR_JIT;
+	}
 
 	auto des = GetI18NCategory("DesktopUI");
 	// Note to translators: do not translate this/add this to PPSSPP-lang's files.

UWP/PPSSPP_UWPMain.cpp

@@ -439,6 +439,8 @@ bool System_GetPropertyBool(SystemProperty prop) {
 #else
 		return false;
 #endif
+	case SYSPROP_CAN_JIT:
+		return true;
 	default:
 		return false;
 	}

Windows/main.cpp

@@ -310,6 +310,8 @@ bool System_GetPropertyBool(SystemProperty prop) {
 #else
 		return false;
 #endif
+	case SYSPROP_CAN_JIT:
+		return true;
 	default:
 		return false;
 	}

headless/Headless.cpp

@@ -89,7 +89,14 @@ std::string System_GetProperty(SystemProperty prop) { return ""; }
 std::vector<std::string> System_GetPropertyStringVec(SystemProperty prop) { return std::vector<std::string>(); }
 int System_GetPropertyInt(SystemProperty prop) { return -1; }
 float System_GetPropertyFloat(SystemProperty prop) { return -1.0f; }
-bool System_GetPropertyBool(SystemProperty prop) { return false; }
+bool System_GetPropertyBool(SystemProperty prop) { 
+	switch (prop) {
+		case SYSPROP_CAN_JIT:
+			return true;
+		default:
+			return false;
+	}
+}
 
 void System_SendMessage(const char *command, const char *parameter) {}
 void System_InputBoxGetString(const std::string &title, const std::string &defaultValue, std::function<void(bool, const std::string &)> cb) { cb(false, ""); }

ios/main.mm

@@ -14,8 +14,10 @@
 #import "PPSSPPUIApplication.h"
 #import "ViewController.h"
 
+#include "Common/MemoryUtil.h"
 #include "Common/System/NativeApp.h"
 #include "Common/System/System.h"
+#include "Common/StringUtils.h"
 #include "Common/Profiler/Profiler.h"
 
 #define	CS_OPS_STATUS		0	/* return status */
@@ -52,11 +54,14 @@ static float g_safeInsetRight = 0.0;
 static float g_safeInsetTop = 0.0;
 static float g_safeInsetBottom = 0.0;
 
+static bool g_jitAvailable = false;
+static int g_iosVersionMajor;
+static int g_iosVersionMinor;
 
 std::string System_GetProperty(SystemProperty prop) {
 	switch (prop) {
 		case SYSPROP_NAME:
-			return "iOS:";
+			return StringFromFormat("iOS %d.%d", g_iosVersionMajor, g_iosVersionMinor);
 		case SYSPROP_LANGREGION:
 			return "en_US";
 		default:
@@ -78,6 +83,8 @@ int System_GetPropertyInt(SystemProperty prop) {
 			return 44100;
 		case SYSPROP_DEVICE_TYPE:
 			return DEVICE_TYPE_MOBILE;
+		case SYSPROP_SYSTEMVERSION:
+			return g_iosVersionMajor;
 		default:
 			return -1;
 	}
@@ -110,6 +117,9 @@ bool System_GetPropertyBool(SystemProperty prop) {
 #else
 			return false;
 #endif
+		case SYSPROP_CAN_JIT:
+			return g_jitAvailable;
+
 		default:
 			return false;
 	}
@@ -200,13 +210,39 @@ void Vibrate(int mode) {
 
 int main(int argc, char *argv[])
 {
+	// Hacky hacks to try to enable JIT by pretending to be a debugger.
 	csops = reinterpret_cast<decltype(csops)>(dlsym(dlopen(nullptr, RTLD_LAZY), "csops"));
 	exc_server = reinterpret_cast<decltype(exc_server)>(dlsym(dlopen(NULL, RTLD_LAZY), "exc_server"));
 	ptrace = reinterpret_cast<decltype(ptrace)>(dlsym(dlopen(NULL, RTLD_LAZY), "ptrace"));
 	// see https://github.com/hrydgard/ppsspp/issues/11905
-	if (!cs_debugged()) {
+
+	// Tried checking for JIT support here with AllocateExecutableMemory and ProtectMemoryPages,
+	// but it just succeeds, and then fails when you try to execute from it.
+
+	// So, we'll just resort to a version check.
+
+	std::string version = [[UIDevice currentDevice].systemVersion UTF8String];
+	if (2 != sscanf(version.c_str(), "%d.%d", &g_iosVersionMajor, &g_iosVersionMinor)) {
+		// Just set it to 14.0 if the parsing fails for whatever reason.
+		g_iosVersionMajor = 14;
+		g_iosVersionMinor = 0;
+	}
+
+	if (g_iosVersionMajor > 14 || (g_iosVersionMajor == 14 && g_iosVersionMinor >= 3)) {
+		g_jitAvailable = false;
+	} else {
+		g_jitAvailable = true;
+	}
+
+	bool debuggerAttached = cs_debugged();
+
+	if (!debuggerAttached) {
+		// Try to fool iOS into thinking a debugger is attached.
+		// This doesn't work in iOS 14.4 anymore.
+
 		pid_t pid = fork();
 		if (pid == 0) {
+			printf("Forked a ptrace call");
 			ptrace(PT_TRACE_ME, 0, nullptr, 0);
 			exit(0);
 		} else if (pid < 0) {
@@ -222,6 +258,9 @@ int main(int argc, char *argv[])
 			pthread_t thread;
 			pthread_create(&thread, nullptr, exception_handler, reinterpret_cast<void *>(&port));
 		}
+	} else {
+		// Debugger is attached - we can actually JIT. Override the version detect.
+		g_jitAvailable = true;
 	}
 
 	PROFILE_INIT();

unittest/UnitTest.cpp

@@ -69,6 +69,10 @@ float System_GetPropertyFloat(SystemProperty prop) {
 	return -1;
 }
 bool System_GetPropertyBool(SystemProperty prop) {
+	switch (prop) {
+	case SYSPROP_CAN_JIT:
+		return true;
+	}
 	return false;
 }