Memory leaks on iOS

CovidCertificate.xcodeproj/project.pbxproj

@@ -55,6 +55,8 @@
 		48CCA621265F93D200887F63 /* CovidCertificateSDK in Frameworks */ = {isa = PBXBuildFile; productRef = 48CCA620265F93D200887F63 /* CovidCertificateSDK */; };
 		48CCA623265F93DB00887F63 /* CovidCertificateSDK in Frameworks */ = {isa = PBXBuildFile; productRef = 48CCA622265F93DB00887F63 /* CovidCertificateSDK */; };
 		48ECCD2A264F0797008678DD /* StaticContentViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = DC8ABDF2264A652800FDE0E1 /* StaticContentViewModel.swift */; };
+		5220AD9C28A3A8BB00460116 /* Client.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5220AD9B28A3A8BB00460116 /* Client.swift */; };
+		5220AD9E28A3A8D800460116 /* Server.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5220AD9D28A3A8D800460116 /* Server.swift */; };
 		6E0281EF2655022A00582904 /* Impressum in Resources */ = {isa = PBXBuildFile; fileRef = 6E0281EE2655022A00582904 /* Impressum */; };
 		6E0281F02655022A00582904 /* Impressum in Resources */ = {isa = PBXBuildFile; fileRef = 6E0281EE2655022A00582904 /* Impressum */; };
 		6E0281F226550E1100582904 /* InfoBoxView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6E0281F126550E1100582904 /* InfoBoxView.swift */; };
@@ -454,6 +456,8 @@
 		274E946A2671E46200110DC5 /* swiss_governmentrootcaii.der */ = {isa = PBXFileReference; lastKnownFileType = file; path = swiss_governmentrootcaii.der; sourceTree = "<group>"; };
 		481D1B252685406700A5F804 /* TransferError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TransferError.swift; sourceTree = "<group>"; };
 		4825D131273D5F3E00F4F71E /* SDKOptionsManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SDKOptionsManager.swift; sourceTree = "<group>"; };
+		5220AD9B28A3A8BB00460116 /* Client.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Client.swift; sourceTree = "<group>"; };
+		5220AD9D28A3A8D800460116 /* Server.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Server.swift; sourceTree = "<group>"; };
 		6E0281EE2655022A00582904 /* Impressum */ = {isa = PBXFileReference; lastKnownFileType = folder; path = Impressum; sourceTree = "<group>"; };
 		6E0281F126550E1100582904 /* InfoBoxView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InfoBoxView.swift; sourceTree = "<group>"; };
 		6E0281F42655280500582904 /* InfoBoxButton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InfoBoxButton.swift; sourceTree = "<group>"; };
@@ -1168,6 +1172,8 @@
 				6EE55D9F2760A01F001F9E1F /* VerifierHomescreenBottomView.swift */,
 				6EC1735E2642A1B4002E27DB /* VerifierHomescreenViewController.swift */,
 				6EA5C3632644298E00EA066F /* VerifierHomescreenInfoView.swift */,
+				5220AD9B28A3A8BB00460116 /* Client.swift */,
+				5220AD9D28A3A8D800460116 /* Server.swift */,
 			);
 			path = Homescreen;
 			sourceTree = "<group>";
@@ -1980,6 +1986,7 @@
 				DCBF64E92679B92C00450D51 /* StackScrollViewController.swift in Sources */,
 				6EC172E726429E31002E27DB /* DebugLog.swift in Sources */,
 				6EC172E826429E31002E27DB /* UBButton.swift in Sources */,
+				5220AD9C28A3A8BB00460116 /* Client.swift in Sources */,
 				6EC172E926429E31002E27DB /* UIStackView+CC.swift in Sources */,
 				6EC172EA26429E31002E27DB /* UBKeyboardObserver.m in Sources */,
 				F8130CE02685B99F00A29326 /* Collection+Safe.swift in Sources */,
@@ -2007,6 +2014,7 @@
 				6EC172F326429E31002E27DB /* UIDevice+ScreenType.swift in Sources */,
 				6EA5C37226444E8600EA066F /* VerifyCheckViewController.swift in Sources */,
 				6EC172F426429E31002E27DB /* StackScrollView.swift in Sources */,
+				5220AD9E28A3A8D800460116 /* Server.swift in Sources */,
 				F88DA6B4268C786D001DB072 /* Error+NetworkError.swift in Sources */,
 				F8E6C5632683808F00A9E112 /* DebugSwitchView.swift in Sources */,
 				6EC172F526429E31002E27DB /* ClickthroughStackView.swift in Sources */,

Verifier/Screens/Homescreen/Client.swift

@@ -0,0 +1,27 @@
+//
+/*
+ * Copyright (c) 2021 Ubique Innovation AG <https://www.ubique.ch>
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
+import Foundation
+
+
+class Client {
+    var server: Server
+
+    init (server: Server) {
+        self.server = server
+
+        self.server.add(client: self) //This line creates a Retain Cycle -> Leak!
+    }
+
+    deinit {
+      print("Client di init")
+    }
+}

Verifier/Screens/Homescreen/LeakyObject.swift

@@ -0,0 +1,56 @@
+//
+/*
+ * Copyright (c) 2021 Ubique Innovation AG <https://www.ubique.ch>
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
+import Foundation
+
+class LeakySwiftObject {
+    var cycle: LeakySwiftObject?
+    let bigObject = BigObject()
+
+    @inline(never)
+    init(cycleSize: Int = 0) {
+        var head = self
+
+        for _ in 0..<cycleSize {
+            head = LeakySwiftObject(cycle: head)
+        }
+
+        self.cycle = head
+
+        print("init LeakySwiftObject")
+    }
+
+    private init(cycle: LeakySwiftObject) {
+        self.cycle = cycle
+    }
+
+    deinit {
+        print("deinit LeakySwiftObject")
+    }
+}
+
+class BigObject {
+    let sizeInBytes = 10_000_000
+
+    var data: Data
+    init() {
+        // When using random data, a pointer back to one of the objects
+        // is possible (even likely) to occur in the data.
+        // This triggers the leak detector to see cycles that really aren't there.
+        // Note that this also shows that the leak detector can't be 100% reliable:
+        // If by chance the app contains a data that *could be, but isn't* a pointer to
+        // a leaked object, the leak detector will not detect that leak.
+//        let range = 0..<Int8.max
+//        let bytes = [0..<sizeInBytes].map { _ in Int8.random(in: range) }
+        let bytes: [Int8] = (0..<sizeInBytes).map { Int8.init(truncatingIfNeeded: $0) }
+        data = Data(bytes: bytes, count: sizeInBytes)
+    }
+}

Verifier/Screens/Homescreen/Server.swift

@@ -0,0 +1,35 @@
+//
+/*
+ * Copyright (c) 2021 Ubique Innovation AG <https://www.ubique.ch>
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
+import Foundation
+
+
+class Server {
+
+    let id: Int
+
+    var clients: [Client] //Because this reference is strong
+
+    func add(client: Client) {
+        self.clients.append(client)
+    }
+
+
+    init(id: Int) {
+        self.id = id
+        self.clients = []
+    }
+
+    deinit {
+      print("Server di init")
+    }
+}
+

Verifier/Screens/Homescreen/SwiftActionHandler.swift

@@ -0,0 +1,42 @@
+//
+/*
+ * Copyright (c) 2021 Ubique Innovation AG <https://www.ubique.ch>
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
+import Foundation
+
+class SwiftActionHandler {
+    @inline(never)
+    private func privateFunction(depth: Int) {
+        if depth == 0 {
+            sleep(1)
+        } else {
+            privateFunction(depth: depth - 1)
+        }
+    }
+
+    @inline(never)
+    func callRecursiveFunction(depth: Int) {
+        privateFunction(depth: depth)
+    }
+
+    @inline(never)
+    func crash() {
+        raise(SIGSEGV)
+    }
+
+    @inline(never)
+    func doAfterRecursing(depth: Int = 0, action: () -> ()) {
+        if depth == 0 {
+            action()
+        } else {
+            doAfterRecursing(depth: depth - 1, action: action)
+        }
+    }
+}

Verifier/Screens/Homescreen/VerifierHomescreenViewController.swift

@@ -19,9 +19,15 @@ extension Notification.Name {
 
 class VerifierHomescreenViewController: HomescreenBaseViewController {
     // MARK: - Init
+
+
 
     init() {
         super.init(color: .cc_greyish)
+        print("Creating Server...")
+        let server = Server(id: 3)
+        let client = Client(server: server)
+        server.add(client: client)
     }
 
     // MARK: - Subviews