Merge branch 'altjit' into develop

# Conflicts:
#	Delta.xcodeproj/project.pbxproj

Delta.xcodeproj/project.pbxproj

@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 46;
+	objectVersion = 52;
 	objects = {
 
 /* Begin PBXAggregateTarget section */
@@ -165,6 +165,9 @@
 		BFFDF03723E3BB2600931B96 /* libSnes9x.a in Frameworks */ = {isa = PBXBuildFile; fileRef = BFFDF03623E3BB2600931B96 /* libSnes9x.a */; };
 		BFFDF03F23E3C28A00931B96 /* libGambatte.a in Frameworks */ = {isa = PBXBuildFile; fileRef = BFFDF03D23E3C0F000931B96 /* libGambatte.a */; };
 		BFFDF04623E3D3A600931B96 /* libMupen64Plus.a in Frameworks */ = {isa = PBXBuildFile; fileRef = BFFDF04523E3D3A600931B96 /* libMupen64Plus.a */; };
+		D524F4A1273DE9A100D500B2 /* AltKit in Frameworks */ = {isa = PBXBuildFile; productRef = D524F4A0273DE9A100D500B2 /* AltKit */; };
+		D524F4A3273DE9C000D500B2 /* ProcessInfo+JIT.swift in Sources */ = {isa = PBXBuildFile; fileRef = D524F4A2273DE9C000D500B2 /* ProcessInfo+JIT.swift */; };
+		D524F4A5273DEBB400D500B2 /* ServerManager+Delta.swift in Sources */ = {isa = PBXBuildFile; fileRef = D524F4A4273DEBB400D500B2 /* ServerManager+Delta.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -358,6 +361,8 @@
 		BFFDF03D23E3C0F000931B96 /* libGambatte.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; path = libGambatte.a; sourceTree = BUILT_PRODUCTS_DIR; };
 		BFFDF04523E3D3A600931B96 /* libMupen64Plus.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; path = libMupen64Plus.a; sourceTree = BUILT_PRODUCTS_DIR; };
 		C786AF1D2DDB6223BE2063CC /* Pods-Delta.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Delta.debug.xcconfig"; path = "Pods/Target Support Files/Pods-Delta/Pods-Delta.debug.xcconfig"; sourceTree = "<group>"; };
+		D524F4A2273DE9C000D500B2 /* ProcessInfo+JIT.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ProcessInfo+JIT.swift"; sourceTree = "<group>"; };
+		D524F4A4273DEBB400D500B2 /* ServerManager+Delta.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ServerManager+Delta.swift"; sourceTree = "<group>"; };
 		DC866E433B3BA9AE18ABA1EC /* libPods-Delta.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = "libPods-Delta.a"; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
 
@@ -373,6 +378,7 @@
 				BFDCA1E6244EBAA900B8FBDB /* liblibDeSmuME.a in Frameworks */,
 				BFCADF1E25D22FE2008D78FB /* Systems.framework in Frameworks */,
 				BF69FBC923E3A8380051BEEA /* libNestopia.a in Frameworks */,
+				D524F4A1273DE9A100D500B2 /* AltKit in Frameworks */,
 				1FA4ABA79AB72914FE414A61 /* libPods-Delta.a in Frameworks */,
 				BFFDF03F23E3C28A00931B96 /* libGambatte.a in Frameworks */,
 				BFFDF03723E3BB2600931B96 /* libSnes9x.a in Frameworks */,
@@ -403,6 +409,8 @@
 				BF647A6922FB8FCE0061D76D /* Bundle+SwizzleBundleID.swift */,
 				BFD1EF3F2336BD8800D197CF /* UIDevice+Processor.swift */,
 				BFE56E1823EB7BE00014FECD /* UIImage+SymbolFallback.swift */,
+				D524F4A2273DE9C000D500B2 /* ProcessInfo+JIT.swift */,
+				D524F4A4273DEBB400D500B2 /* ServerManager+Delta.swift */,
 			);
 			path = Extensions;
 			sourceTree = "<group>";
@@ -908,6 +916,7 @@
 			);
 			name = Delta;
 			packageProductDependencies = (
+				D524F4A0273DE9A100D500B2 /* AltKit */,
 			);
 			productName = Delta;
 			productReference = BFFA71D71AAC406100EE9DD1 /* Delta.app */;
@@ -957,6 +966,9 @@
 				Base,
 			);
 			mainGroup = BFFA71CE1AAC406100EE9DD1;
+			packageReferences = (
+				D524F49F273DE9A100D500B2 /* XCRemoteSwiftPackageReference "AltKit" */,
+			);
 			productRefGroup = BFFA71D81AAC406100EE9DD1 /* Products */;
 			projectDirPath = "";
 			projectRoot = "";
@@ -1148,6 +1160,7 @@
 				BF04E6FF1DB8625C000F35D3 /* ControllerSkinsViewController.swift in Sources */,
 				BF5942891E09BC8B0051894B /* _GameCollection.swift in Sources */,
 				BF34FA111CF1899D006624C7 /* CheatTextView.swift in Sources */,
+				D524F4A5273DEBB400D500B2 /* ServerManager+Delta.swift in Sources */,
 				BF1F45AD21AF57BA00EF9895 /* HarmonyMetadataKey+Keys.swift in Sources */,
 				BFD1EF402336BD8800D197CF /* UIDevice+Processor.swift in Sources */,
 				BF71CF871FE90006001F1613 /* AppIconShortcutsViewController.swift in Sources */,
@@ -1179,6 +1192,7 @@
 				BF6EE5E91F7C5F860051AD6C /* _GameControllerInputMapping.swift in Sources */,
 				BF5942871E09BC8B0051894B /* _ControllerSkin.swift in Sources */,
 				BF95E2791E4982A10030E7AD /* GamesDatabaseBrowserViewController.swift in Sources */,
+				D524F4A3273DE9C000D500B2 /* ProcessInfo+JIT.swift in Sources */,
 				BFDCA1E9244F7E1000B8FBDB /* Delta5ToDelta6.xcmappingmodel in Sources */,
 				BFD097211D3A01B8005A44C2 /* SaveStatesViewController.swift in Sources */,
 				BF6EE5EB1F7C5F8F0051AD6C /* GameControllerInputMapping.swift in Sources */,
@@ -1407,7 +1421,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.rileytestut.Delta;
 				PRODUCT_NAME = Delta;
 				SDKROOT = iphoneos;
-				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
@@ -1462,9 +1477,10 @@
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				STRIP_INSTALLED_PRODUCT = YES;
 				STRIP_STYLE = "non-global";
+				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_INCLUDE_PATHS = "$(inherited) \"$(SRCROOT)/Cores/GPGXDeltaCore/Sources/GPGXBridge\"";
 				SWIFT_OBJC_BRIDGING_HEADER = "Delta/Supporting Files/Delta-Bridging-Header.h";
-				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				SWIFT_VERSION = 5.0;
 			};
 			name = Release;
@@ -1510,6 +1526,25 @@
 		};
 /* End XCConfigurationList section */
 
+/* Begin XCRemoteSwiftPackageReference section */
+		D524F49F273DE9A100D500B2 /* XCRemoteSwiftPackageReference "AltKit" */ = {
+			isa = XCRemoteSwiftPackageReference;
+			repositoryURL = "https://github.com/rileytestut/AltKit.git";
+			requirement = {
+				kind = revision;
+				revision = 2fd376df1c79ec06a5c80cc8933da027f65b3148;
+			};
+		};
+/* End XCRemoteSwiftPackageReference section */
+
+/* Begin XCSwiftPackageProductDependency section */
+		D524F4A0273DE9A100D500B2 /* AltKit */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = D524F49F273DE9A100D500B2 /* XCRemoteSwiftPackageReference "AltKit" */;
+			productName = AltKit;
+		};
+/* End XCSwiftPackageProductDependency section */
+
 /* Begin XCVersionGroup section */
 		BF4828811F9027B600028B97 /* Delta.xcdatamodeld */ = {
 			isa = XCVersionGroup;

Delta.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -1,6 +1,15 @@
 {
   "object": {
     "pins": [
+      {
+        "package": "AltKit",
+        "repositoryURL": "https://github.com/rileytestut/AltKit.git",
+        "state": {
+          "branch": null,
+          "revision": "2fd376df1c79ec06a5c80cc8933da027f65b3148",
+          "version": null
+        }
+      },
       {
         "package": "DeltaCore",
         "repositoryURL": "https://github.com/rileytestut/DeltaCore.git",

Delta/AppDelegate.swift

@@ -10,6 +10,7 @@ import UIKit
 
 import DeltaCore
 import Harmony
+import AltKit
 
 import Fabric
 import Crashlytics
@@ -63,6 +64,9 @@ class AppDelegate: UIResponder, UIApplicationDelegate
         // Controllers
         ExternalGameControllerManager.shared.startMonitoring()
         
+        // JIT
+        ServerManager.shared.prepare()
+        
         // Notifications
         let center = CFNotificationCenterGetDarwinNotifyCenter()
         CFNotificationCenterAddObserver(center, nil, ReceivedApplicationState, CFNotificationName.altstoreRequestAppState.rawValue, nil, .deliverImmediately)

Delta/Base.lproj/Settings.storyboard

@@ -1861,10 +1861,48 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                     </tableViewCell>
                                 </cells>
                             </tableViewSection>
+                            <tableViewSection headerTitle="Performance" footerTitle="When enabled, Delta will automatically enable JIT when on the same WiFi network as AltServer." id="MyM-jI-qtY" userLabel="Performance">
+                                <cells>
+                                    <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="none" indentationWidth="10" reuseIdentifier="SwitchCell" id="uXJ-qB-E2e" customClass="SwitchTableViewCell">
+                                        <rect key="frame" x="0.0" y="284" width="375" height="44"/>
+                                        <autoresizingMask key="autoresizingMask"/>
+                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="uXJ-qB-E2e" id="mkz-9w-FlW">
+                                            <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
+                                            <autoresizingMask key="autoresizingMask"/>
+                                            <subviews>
+                                                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Use AltJIT" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="XPc-dG-N6R">
+                                                    <rect key="frame" x="16" y="11.5" width="286" height="21"/>
+                                                    <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                                    <nil key="textColor"/>
+                                                    <nil key="highlightedColor"/>
+                                                </label>
+                                                <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" on="YES" translatesAutoresizingMaskIntoConstraints="NO" id="4Y4-gY-MaX">
+                                                    <rect key="frame" x="310" y="6.5" width="51" height="31"/>
+                                                    <color key="onTintColor" name="Purple"/>
+                                                    <connections>
+                                                        <action selector="toggleAltJITEnabled:" destination="OwL-4c-EEA" eventType="valueChanged" id="lfe-xg-J5o"/>
+                                                        <action selector="togglePreviewsEnabled:" destination="eHi-aO-uGS" eventType="primaryActionTriggered" id="BKJ-dV-k7X"/>
+                                                    </connections>
+                                                </switch>
+                                            </subviews>
+                                            <constraints>
+                                                <constraint firstAttribute="trailingMargin" secondItem="4Y4-gY-MaX" secondAttribute="trailing" id="6Rs-qs-gFM"/>
+                                                <constraint firstItem="XPc-dG-N6R" firstAttribute="leading" secondItem="mkz-9w-FlW" secondAttribute="leadingMargin" id="BBM-mW-kez"/>
+                                                <constraint firstItem="4Y4-gY-MaX" firstAttribute="centerY" secondItem="mkz-9w-FlW" secondAttribute="centerY" id="CY7-Kt-ggC"/>
+                                                <constraint firstItem="4Y4-gY-MaX" firstAttribute="leading" secondItem="XPc-dG-N6R" secondAttribute="trailing" constant="8" symbolic="YES" id="Qce-jc-vX3"/>
+                                                <constraint firstItem="XPc-dG-N6R" firstAttribute="centerY" secondItem="mkz-9w-FlW" secondAttribute="centerY" id="Xzp-aR-4Dz"/>
+                                            </constraints>
+                                        </tableViewCellContentView>
+                                        <connections>
+                                            <outlet property="switchView" destination="4Y4-gY-MaX" id="NDr-Y9-9RS"/>
+                                        </connections>
+                                    </tableViewCell>
+                                </cells>
+                            </tableViewSection>
                             <tableViewSection headerTitle="DS BIOS Files" footerTitle="Delta requires these BIOS files in order to play Nintendo DS games. Tap one to import it from Files." id="ObZ-cl-5sV">
                                 <cells>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="Bfp-iA-wWE" detailTextLabel="Xpe-sd-GRy" style="IBUITableViewCellStyleValue1" id="ian-1X-SOi">
-                                        <rect key="frame" x="0.0" y="284" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="408" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="ian-1X-SOi" id="nE9-5Y-G2k">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -1887,7 +1925,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="fgD-y0-55T" detailTextLabel="b8s-cx-IgW" style="IBUITableViewCellStyleValue1" id="dwT-0T-gFD">
-                                        <rect key="frame" x="0.0" y="328" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="452" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="dwT-0T-gFD" id="KEg-18-WYZ">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -1910,7 +1948,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="SIu-zD-qfE" detailTextLabel="CW8-h0-YST" style="IBUITableViewCellStyleValue1" id="Tll-tX-97T">
-                                        <rect key="frame" x="0.0" y="372" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="496" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="Tll-tX-97T" id="4ca-AM-jBE">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -1937,7 +1975,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                             <tableViewSection headerTitle="DSi BIOS Files" footerTitle="Delta requires these BIOS files in order to play Nintendo DSi games. Tap one to import it from Files." id="SAz-hG-O4G">
                                 <cells>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="QKd-rm-101" detailTextLabel="pJb-OR-TGs" style="IBUITableViewCellStyleValue1" id="jwN-8n-xgM">
-                                        <rect key="frame" x="0.0" y="496" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="620" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="jwN-8n-xgM" id="b29-V1-qt3">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -1960,7 +1998,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="6OX-32-izR" detailTextLabel="2bc-8r-epB" style="IBUITableViewCellStyleValue1" id="3ka-mn-QqR">
-                                        <rect key="frame" x="0.0" y="540" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="664" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="3ka-mn-QqR" id="4ya-QS-s5w">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -1983,7 +2021,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="Czu-qN-Luq" detailTextLabel="eVw-7r-BEf" style="IBUITableViewCellStyleValue1" id="4FF-9a-jq2">
-                                        <rect key="frame" x="0.0" y="584" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="708" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="4FF-9a-jq2" id="emb-d3-TgY">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -2006,7 +2044,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                                         </tableViewCellContentView>
                                     </tableViewCell>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="Cell" textLabel="VWi-nu-uMv" detailTextLabel="8JD-uT-eoA" style="IBUITableViewCellStyleValue1" id="we3-0h-uKq">
-                                        <rect key="frame" x="0.0" y="628" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="752" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="we3-0h-uKq" id="cG1-a2-Nez">
                                             <rect key="frame" x="0.0" y="0.0" width="349.5" height="44"/>
@@ -2033,7 +2071,7 @@ Delta uses OpenVGDB to provide automatic artwork for imported games.</string>
                             <tableViewSection headerTitle="" footerTitle="Changing cores may improve performance at the cost of additional features." id="hbM-mL-bIr">
                                 <cells>
                                     <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="gray" indentationWidth="10" reuseIdentifier="ChangeCell" textLabel="Jmx-Jw-278" style="IBUITableViewCellStyleDefault" id="p1T-4d-fC3">
-                                        <rect key="frame" x="0.0" y="737.5" width="375" height="44"/>
+                                        <rect key="frame" x="0.0" y="861.5" width="375" height="44"/>
                                         <autoresizingMask key="autoresizingMask"/>
                                         <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="p1T-4d-fC3" id="3bs-Bp-nd4">
                                             <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>

Delta/Emulation/GameViewController.swift

@@ -10,11 +10,13 @@ import UIKit
 
 import DeltaCore
 import GBADeltaCore
+import MelonDSDeltaCore
 import Systems
 
 import struct DSDeltaCore.DS
 
 import Roxas
+import AltKit
 
 private var kvoContext = 0
 
@@ -167,6 +169,8 @@ class GameViewController: DeltaCore.GameViewController
     private var isGyroActive = false
     private var presentedGyroAlert = false
     
+    private var presentedJITAlert = false
+    
     override var shouldAutorotate: Bool {
         return !self.isGyroActive
     }
@@ -205,6 +209,8 @@ class GameViewController: DeltaCore.GameViewController
         NotificationCenter.default.addObserver(self, selector: #selector(GameViewController.didDeactivateGyro(with:)), name: GBA.didDeactivateGyroNotification, object: nil)
         
         NotificationCenter.default.addObserver(self, selector: #selector(GameViewController.emulationDidQuit(with:)), name: EmulatorCore.emulationDidQuitNotification, object: nil)
+        
+        NotificationCenter.default.addObserver(self, selector: #selector(GameViewController.didEnableJIT(with:)), name: ServerManager.didEnableJITNotification, object: nil)
     }
     
     deinit
@@ -330,6 +336,10 @@ extension GameViewController
             
             UserDefaults.standard.desmumeDeprecatedAlertCount += 1
         }
+        else if self.emulatorCore?.deltaCore == MelonDS.core, ProcessInfo.processInfo.isJITAvailable
+        {
+            self.showJITEnabledAlert()
+        }
     }
     
     override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator)
@@ -474,6 +484,13 @@ extension GameViewController
                 }
                 
                 self._isLoadingSaveState = false
+                
+                if self.emulatorCore?.deltaCore == MelonDS.core, ProcessInfo.processInfo.isJITAvailable
+                {
+                    self.transitionCoordinator?.animate(alongsideTransition: nil, completion: { (context) in
+                        self.showJITEnabledAlert()
+                    })
+                }
             }
             
         case "unwindToGames":
@@ -1085,6 +1102,48 @@ private extension GameViewController
         toastView.presentationEdge = .top
         toastView.show(in: self.view, duration: duration)
     }
+    
+    func showJITEnabledAlert()
+    {
+        guard !self.presentedJITAlert, self.presentedViewController == nil, self.game != nil else { return }
+        self.presentedJITAlert = true
+        
+        func presentToastView()
+        {
+            let detailText: String?
+            let duration: TimeInterval
+            
+            if UserDefaults.standard.jitEnabledAlertCount < 3
+            {
+                detailText = NSLocalizedString("You can now Fast Forward DS games up to 3x speed.", comment: "")
+                duration = 5.0
+            }
+            else
+            {
+                detailText = nil
+                duration = 2.0
+            }
+            
+            let toastView = RSTToastView(text: NSLocalizedString("JIT Compilation Enabled", comment: ""), detailText: detailText)
+            toastView.edgeOffset.vertical = 8
+            self.show(toastView, duration: duration)
+            
+            UserDefaults.standard.jitEnabledAlertCount += 1
+        }
+        
+        DispatchQueue.main.async {
+            if let transitionCoordinator = self.transitionCoordinator
+            {
+                transitionCoordinator.animate(alongsideTransition: nil) { (context) in
+                    presentToastView()
+                }
+            }
+            else
+            {
+                presentToastView()
+            }
+        }
+    }
 }
 
 //MARK: - Notifications -
@@ -1129,7 +1188,7 @@ private extension GameViewController
             
         case .translucentControllerSkinOpacity: self.controllerView.translucentControllerSkinOpacity = Settings.translucentControllerSkinOpacity
             
-        case .syncingService: break
+        case .syncingService, .isAltJITEnabled: break
         }
     }
     
@@ -1207,6 +1266,60 @@ private extension GameViewController
         self.isGyroActive = false
     }
     
+    @objc func didEnableJIT(with notification: Notification)
+    {
+        DispatchQueue.main.async {
+            self.showJITEnabledAlert()
+        }
+        
+        DispatchQueue.global(qos: .utility).async {
+            guard let emulatorCore = self.emulatorCore, let emulatorBridge = emulatorCore.deltaCore.emulatorBridge as? MelonDSEmulatorBridge, !emulatorBridge.isJITEnabled
+            else { return }
+            
+            guard emulatorCore.state != .stopped else {
+                // Emulator core is not running, which means we can set
+                // isJITEnabled to true without resetting the core.
+                emulatorBridge.isJITEnabled = true
+                return
+            }
+            
+            let isVideoEnabled = emulatorCore.videoManager.isEnabled
+            emulatorCore.videoManager.isEnabled = false
+            
+            let isRunning = (emulatorCore.state == .running)
+            if isRunning
+            {
+                self.pauseEmulation()
+            }
+            
+            let temporaryFileURL = FileManager.default.uniqueTemporaryURL()
+            
+            let saveState = emulatorCore.saveSaveState(to: temporaryFileURL)
+            emulatorCore.stop()
+            
+            emulatorBridge.isJITEnabled = true
+            
+            emulatorCore.start()
+            emulatorCore.pause()
+            
+            do
+            {
+                try emulatorCore.load(saveState)
+            }
+            catch
+            {
+                print("Failed to load save state after enabling JIT.", error)
+            }
+            
+            if isRunning
+            {
+                self.resumeEmulation()
+            }
+            
+            emulatorCore.videoManager.isEnabled = isVideoEnabled
+        }
+    }
+    
     @objc func emulationDidQuit(with notification: Notification)
     {
         DispatchQueue.main.async {
@@ -1231,4 +1344,6 @@ private extension GameViewController
 private extension UserDefaults
 {
     @NSManaged var desmumeDeprecatedAlertCount: Int
+    
+    @NSManaged var jitEnabledAlertCount: Int
 }

Delta/Extensions/ProcessInfo+JIT.swift

@@ -0,0 +1,41 @@
+//
+//  ProcessInfo+JIT.swift
+//  Delta
+//
+//  Created by Riley Testut on 9/14/21.
+//  Copyright © 2021 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+private let CS_OPS_STATUS: UInt32 = 0 /* OK */
+private let CS_DEBUGGED: UInt32   = 0x10000000  /* Process is or has been attached to debugger. */
+
+@_silgen_name("csops")
+func csops(_ pid: pid_t, _ ops: UInt32, _ useraddr: UnsafeMutableRawPointer?, _ usersize: Int) -> Int
+
+extension ProcessInfo
+{
+    static var isJITDisabled = false
+    
+    var isDebugging: Bool {
+        var flags: UInt32 = 0
+        let result = csops(getpid(), CS_OPS_STATUS, &flags, MemoryLayout<UInt32>.size)
+        
+        let isDebugging = result == 0 && (flags & CS_DEBUGGED == CS_DEBUGGED)
+        return isDebugging
+    }
+    
+    var isJITAvailable: Bool {
+        guard UIDevice.current.supportsJIT && !ProcessInfo.isJITDisabled else { return false }
+        
+        let ios14_4 = OperatingSystemVersion(majorVersion: 14, minorVersion: 4, patchVersion: 0)
+        if #available(iOS 14.2, *), !ProcessInfo.processInfo.isOperatingSystemAtLeast(ios14_4)
+        {
+            // JIT is always available on supported devices running iOS 14.2 - 14.3.
+            return true
+        }
+        
+        return self.isDebugging
+    }
+}

Delta/Extensions/ServerManager+Delta.swift

@@ -0,0 +1,104 @@
+//
+//  ServerManager+Delta.swift
+//  Delta
+//
+//  Created by Riley Testut on 9/15/21.
+//  Copyright © 2021 Riley Testut. All rights reserved.
+//
+
+import AltKit
+
+extension ServerManager
+{
+    static let didEnableJITNotification = Notification.Name("didEnableJITNotification")
+}
+
+extension ServerManager
+{
+    func prepare()
+    {
+        NotificationCenter.default.addObserver(self, selector: #selector(ServerManager.didChangeJITMode(_:)), name: .settingsDidChange, object: nil)
+        
+        #if DEBUG
+        if ProcessInfo.processInfo.isDebugging
+        {
+            // Debugger is attached at app launch, so we assume
+            // we're connected to Xcode for debugging purposes.
+            // In that case, we manually treat JIT as unavailable
+            // until AltServer is discovered to simulate real-world use.
+            ProcessInfo.isJITDisabled = true
+        }
+        #endif
+        
+        self.start()
+    }
+}
+
+private extension ServerManager
+{
+    func start()
+    {
+        guard Settings.isAltJITEnabled && !ProcessInfo.processInfo.isJITAvailable else { return }
+        
+        self.startDiscovering()
+        self.autoconnect()
+    }
+    
+    func autoconnect()
+    {
+        self.autoconnect { result in
+            switch result
+            {
+            case .failure(let error):
+                print("Could not auto-connect to server.", error)
+                self.autoconnect()
+                
+            case .success(let connection):
+                func finish(result: Result<Void, Error>)
+                {
+                    switch result
+                    {
+                    case .failure(ALTServerError.unknownRequest), .failure(ALTServerError.deviceNotFound):
+                        // Try connecting to a different server.
+                        self.autoconnect()
+                        
+                    case .failure(let error):
+                        print("Could not enable JIT compilation.", error)
+                        
+                    case .success:
+                        print("Successfully enabled JIT compilation!")
+                        
+                        NotificationCenter.default.post(name: ServerManager.didEnableJITNotification, object: nil)
+                        self.stopDiscovering()
+                    }
+                    
+                    connection.disconnect()
+                }
+                
+                if ProcessInfo.isJITDisabled
+                {
+                    ProcessInfo.isJITDisabled = false
+                    finish(result: .success(()))
+                }
+                else
+                {
+                    connection.enableUnsignedCodeExecution(completion: finish)
+                }
+            }
+        }
+    }
+    
+    @objc func didChangeJITMode(_ notification: Notification)
+    {
+        guard let name = notification.userInfo?[Settings.NotificationUserInfoKey.name] as? Settings.Name, name == Settings.Name.isAltJITEnabled else { return }
+        
+        if Settings.isAltJITEnabled
+        {
+            self.start()
+        }
+        else
+        {
+            self.stopDiscovering()
+        }
+    }
+}

Delta/Extensions/UIDevice+Processor.swift

@@ -26,12 +26,9 @@ extension UIDevice
     }
     
     var supportsJIT: Bool {
-        // As of iOS 14.4 beta 2, JIT is no longer supported :(
+        guard #available(iOS 14.0, *) else { return false }
-        // Hopefully this change is reversed before the public release...
-        let ios14_4 = OperatingSystemVersion(majorVersion: 14, minorVersion: 4, patchVersion: 0)
-        guard #available(iOS 14.2, *), !ProcessInfo.processInfo.isOperatingSystemAtLeast(ios14_4) else { return false }
         
-        // JIT is supported on devices with an A12 processor or better running iOS 14.2 or later.
+        // JIT is supported on devices with an A12 processor or better running iOS 14.0 or later.
         // ARKit 3 is only supported by devices with an A12 processor or better, according to the documentation.
         return ARBodyTrackingConfiguration.isSupported
     }

Delta/Game Selection/GameCollectionViewController.swift

@@ -180,7 +180,7 @@ extension GameCollectionViewController
                     emulatorBridge.systemType = .ds
                 }
                 
-                emulatorBridge.isJITEnabled = UIDevice.current.supportsJIT
+                emulatorBridge.isJITEnabled = ProcessInfo.processInfo.isJITAvailable
             }
             
             if let saveState = self.activeSaveState
@@ -843,7 +843,7 @@ extension GameCollectionViewController: UIViewControllerPreviewingDelegate
                 emulatorBridge.systemType = .ds
             }
 
-            emulatorBridge.isJITEnabled = UIDevice.current.supportsJIT
+            emulatorBridge.isJITEnabled = ProcessInfo.processInfo.isJITAvailable
         }
         
         let actions = self.actions(for: game).previewActions

Delta/Settings/App Icon Shortcuts/AppIconShortcutsViewController.swift

@@ -14,7 +14,7 @@ import DeltaCore
 import Roxas
 
 @objc(SwitchTableViewCell)
-private class SwitchTableViewCell: UITableViewCell
+class SwitchTableViewCell: UITableViewCell
 {
     @IBOutlet var switchView: UISwitch!
 }

Delta/Settings/Cores/MelonDSCoreSettingsViewController.swift

@@ -23,6 +23,7 @@ private extension MelonDSCoreSettingsViewController
     enum Section: Int
     {
         case general
+        case performance
         case dsBIOS
         case dsiBIOS
         case changeCore
@@ -149,6 +150,10 @@ private extension MelonDSCoreSettingsViewController
         
         switch section
         {
+        case .performance:
+            guard Settings.preferredCore(for: .ds) == MelonDS.core else { return true }
+            return !UIDevice.current.supportsJIT
+            
         case .dsBIOS where Settings.preferredCore(for: .ds) == DS.core:
             // Using DeSmuME core, which doesn't require BIOS.
             return true
@@ -252,6 +257,11 @@ private extension MelonDSCoreSettingsViewController
         }
     }
     
+    @IBAction func toggleAltJITEnabled(_ sender: UISwitch)
+    {
+        Settings.isAltJITEnabled = sender.isOn
+    }
+    
     @objc func willEnterForeground(_ notification: Notification)
     {
         self.tableView.reloadData()
@@ -300,6 +310,10 @@ extension MelonDSCoreSettingsViewController
             
             cell.contentView.isHidden = (item == nil)
             
+        case .performance:
+            let cell = cell as! SwitchTableViewCell
+            cell.switchView.isOn = Settings.isAltJITEnabled
+            
         case .dsBIOS:
             let bios = DSBIOS.allCases[indexPath.row]
             
@@ -378,6 +392,8 @@ extension MelonDSCoreSettingsViewController
             
         case .changeCore:
             self.changeCore()
+            
+        case .performance: break
         }
     }
     

Delta/Settings/Settings.swift

@@ -38,6 +38,7 @@ extension Settings
         case syncingService
         case isButtonHapticFeedbackEnabled
         case isThumbstickHapticFeedbackEnabled
+        case isAltJITEnabled
     }
 }
 
@@ -60,6 +61,7 @@ struct Settings
                         #keyPath(UserDefaults.isThumbstickHapticFeedbackEnabled): true,
                         #keyPath(UserDefaults.sortSaveStatesByOldestFirst): true,
                         #keyPath(UserDefaults.isPreviewsEnabled): true,
+                        #keyPath(UserDefaults.isAltJITEnabled): true,
                         Settings.preferredCoreSettingsKey(for: .ds): MelonDS.core.identifier] as [String : Any]
         UserDefaults.standard.register(defaults: defaults)
         
@@ -195,6 +197,17 @@ extension Settings
         }
     }
     
+    static var isAltJITEnabled: Bool {
+        get {
+            let isAltJITEnabled = UserDefaults.standard.isAltJITEnabled
+            return isAltJITEnabled
+        }
+        set {
+            UserDefaults.standard.isAltJITEnabled = newValue
+            NotificationCenter.default.post(name: .settingsDidChange, object: nil, userInfo: [NotificationUserInfoKey.name: Name.isAltJITEnabled])
+        }
+    }
+    
     static func preferredCore(for gameType: GameType) -> DeltaCoreProtocol?
     {
         let key = self.preferredCoreSettingsKey(for: gameType)
@@ -390,4 +403,6 @@ private extension UserDefaults
     @NSManaged var sortSaveStatesByOldestFirst: Bool
     
     @NSManaged var isPreviewsEnabled: Bool
+    
+    @NSManaged var isAltJITEnabled: Bool
 }

Delta/Settings/SettingsViewController.swift

@@ -290,7 +290,7 @@ private extension SettingsViewController
                 self.tableView.selectRow(at: selectedIndexPath, animated: true, scrollPosition: .none)
             }
             
-        case .localControllerPlayerIndex, .preferredControllerSkin, .translucentControllerSkinOpacity, .isButtonHapticFeedbackEnabled, .isThumbstickHapticFeedbackEnabled: break
+        case .localControllerPlayerIndex, .preferredControllerSkin, .translucentControllerSkinOpacity, .isButtonHapticFeedbackEnabled, .isThumbstickHapticFeedbackEnabled, .isAltJITEnabled: break
         }
     }
 

Delta/Supporting Files/Info.plist

@@ -400,5 +400,13 @@
 			</dict>
 		</dict>
 	</array>
+    <key>NSBonjourServices</key>
+    <array>
+        <string>_altserver._tcp</string>
+    </array>
+    <key>ALTDeviceID</key>
+    <string>00008110-000A68390A82801E</string>
+    <key>NSLocalNetworkUsageDescription</key>
+    <string>Delta uses the local network to communicate with AltServer and enable JIT.</string>
 </dict>
 </plist>

Delta/Systems/DeltaCoreProtocol+Delta.swift

@@ -72,7 +72,7 @@ extension DeltaCoreProtocol
         case GBA.core: return 3
         case N64.core where UIDevice.current.hasA11ProcessorOrBetter: return 3
         case N64.core where UIDevice.current.hasA9ProcessorOrBetter: return 1.5
-        case MelonDS.core where UIDevice.current.supportsJIT: return 3
+        case MelonDS.core where ProcessInfo.processInfo.isJITAvailable: return 3
         case MelonDS.core where UIDevice.current.hasA11ProcessorOrBetter: return 1.5
         case GPGX.core: return 4
         default: return 1