(WIP) Rewrite parts of the app in Swift and fix iOS 26.4 issues

StikDebug.xcodeproj/project.pbxproj

@@ -448,14 +448,15 @@
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
-				DEVELOPMENT_TEAM = XXK735HX49;
+				DEVELOPMENT_TEAM = "";
 				ENABLE_HARDENED_RUNTIME = YES;
 				ENABLE_PREVIEWS = YES;
-				FRAMEWORK_SEARCH_PATHS = (
+				FRAMEWORK_SEARCH_PATHS = "$(inherited)";
+				GENERATE_INFOPLIST_FILE = YES;
+				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
-					"$(PROJECT_DIR)/StikJIT/Sources",
+					"$(PROJECT_DIR)/StikJIT/idevice",
 				);
-				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = StikJIT/Info.plist;
 				INFOPLIST_KEY_ITSAppUsesNonExemptEncryption = NO;
 				INFOPLIST_KEY_LSSupportsOpeningDocumentsInPlace = YES;
@@ -490,7 +491,7 @@
 				SUPPORTS_MACCATALYST = NO;
 				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SWIFT_EMIT_LOC_STRINGS = YES;
-				SWIFT_OBJC_BRIDGING_HEADER = "StikJIT/StikJIT-Bridging-Header.h";
+				SWIFT_INCLUDE_PATHS = "$(inherited) $(PROJECT_DIR)/StikJIT/idevice";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
@@ -509,14 +510,15 @@
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
-				DEVELOPMENT_TEAM = XXK735HX49;
+				DEVELOPMENT_TEAM = "";
 				ENABLE_HARDENED_RUNTIME = YES;
 				ENABLE_PREVIEWS = YES;
-				FRAMEWORK_SEARCH_PATHS = (
+				FRAMEWORK_SEARCH_PATHS = "$(inherited)";
+				GENERATE_INFOPLIST_FILE = YES;
+				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
-					"$(PROJECT_DIR)/StikJIT/Sources",
+					"$(PROJECT_DIR)/StikJIT/idevice",
 				);
-				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = StikJIT/Info.plist;
 				INFOPLIST_KEY_ITSAppUsesNonExemptEncryption = NO;
 				INFOPLIST_KEY_LSSupportsOpeningDocumentsInPlace = YES;
@@ -551,7 +553,7 @@
 				SUPPORTS_MACCATALYST = NO;
 				SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD = NO;
 				SWIFT_EMIT_LOC_STRINGS = YES;
-				SWIFT_OBJC_BRIDGING_HEADER = "StikJIT/StikJIT-Bridging-Header.h";
+				SWIFT_INCLUDE_PATHS = "$(inherited) $(PROJECT_DIR)/StikJIT/idevice";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				XROS_DEPLOYMENT_TARGET = 2.2;

StikJIT/JSSupport/JSDebugSupport.swift

@@ -0,0 +1,161 @@
+//
+//  JSDebugSupport.swift
+//  StikDebug
+//
+//  Created by Stephen on 2026/3/30.
+//
+
+import Foundation
+import JavaScriptCore
+import idevice
+
+private func jsException(_ message: String, in context: JSContext?) {
+    guard let context else { return }
+    context.exception = JSValue(object: message, in: context)
+}
+
+private func describeIdeviceError(_ ffiError: UnsafeMutablePointer<IdeviceFfiError>) -> String {
+    if let message = ffiError.pointee.message {
+        return "error code \(ffiError.pointee.code), msg \(String(cString: message))"
+    }
+    return "error code \(ffiError.pointee.code)"
+}
+
+func handleJSContextSendDebugCommand(_ context: JSContext?, _ commandStr: String, _ debugProxy: OpaquePointer?) -> String? {
+    guard let debugProxy else {
+        jsException("debug proxy is unavailable", in: context)
+        return nil
+    }
+
+    guard let command = debugserver_command_new(commandStr, nil, 0) else {
+        jsException("failed to allocate debugserver command", in: context)
+        return nil
+    }
+
+    var response: UnsafeMutablePointer<CChar>?
+    let ffiError = debug_proxy_send_command(debugProxy, command, &response)
+    debugserver_command_free(command)
+
+    if let ffiError {
+        jsException(describeIdeviceError(ffiError), in: context)
+        idevice_error_free(ffiError)
+        if let response {
+            idevice_string_free(response)
+        }
+        return nil
+    }
+
+    defer {
+        if let response {
+            idevice_string_free(response)
+        }
+    }
+
+    guard let response else { return nil }
+    return String(cString: response)
+}
+
+private func hexCharacter(for value: UInt8) -> UInt8 {
+    if value < 10 {
+        return value + Character("0").asciiValue!
+    }
+    return value + 87
+}
+
+private func fillAddress(into buffer: inout [UInt8], at index: Int, address: UInt64) {
+    let masks: [UInt64] = [
+        0xf00000000,
+        0x0f0000000,
+        0x00f000000,
+        0x000f00000,
+        0x0000f0000,
+        0x00000f000,
+        0x000000f00,
+        0x0000000f0,
+        0x00000000f,
+    ]
+
+    for (offset, mask) in masks.enumerated() {
+        let shift = UInt64((masks.count - 1 - offset) * 4)
+        let nibble = UInt8((address & mask) >> shift)
+        buffer[index + offset] = hexCharacter(for: nibble)
+    }
+}
+
+private func writeChecksum(into buffer: inout [UInt8], at startIndex: Int) {
+    var checksum: UInt8 = 0
+    var index = startIndex
+    while buffer[index] != Character("#").asciiValue! {
+        checksum &+= buffer[index]
+        index += 1
+    }
+
+    buffer[index + 1] = hexCharacter(for: (checksum & 0xf0) >> 4)
+    buffer[index + 2] = hexCharacter(for: checksum & 0x0f)
+}
+
+private func makeBulkWriteCommands(startAddress: UInt64, pageSize: UInt64) -> [UInt8] {
+    let commandCount = Int(pageSize >> 14)
+    var buffer = [UInt8](repeating: 0, count: commandCount * 19)
+
+    var currentAddress = startAddress
+    for commandIndex in 0..<commandCount {
+        let start = commandIndex * 19
+        buffer[start + 0] = Character("$").asciiValue!
+        buffer[start + 1] = Character("M").asciiValue!
+        fillAddress(into: &buffer, at: start + 2, address: currentAddress)
+        buffer[start + 11] = Character(",").asciiValue!
+        buffer[start + 12] = Character("1").asciiValue!
+        buffer[start + 13] = Character(":").asciiValue!
+        buffer[start + 14] = Character("6").asciiValue!
+        buffer[start + 15] = Character("9").asciiValue!
+        buffer[start + 16] = Character("#").asciiValue!
+        writeChecksum(into: &buffer, at: start + 1)
+        currentAddress += 16_384
+    }
+
+    return buffer
+}
+
+func handleJITPageWrite(_ context: JSContext?, _ startAddr: UInt64, _ jitPagesSize: UInt64, _ debugProxy: OpaquePointer?) -> String? {
+    guard let debugProxy else {
+        jsException("debug proxy is unavailable", in: context)
+        return nil
+    }
+
+    let commandBuffer = makeBulkWriteCommands(startAddress: startAddr, pageSize: jitPagesSize)
+    let commandCount = Int(jitPagesSize >> 14)
+    let commandsPerBatch = 128
+
+    for batchStart in stride(from: 0, to: commandCount, by: commandsPerBatch) {
+        let commandsToSend = min(commandsPerBatch, commandCount - batchStart)
+        let byteOffset = batchStart * 19
+        let byteCount = commandsToSend * 19
+
+        let ffiError = commandBuffer.withUnsafeBytes { rawBuffer -> UnsafeMutablePointer<IdeviceFfiError>? in
+            let baseAddress = rawBuffer.bindMemory(to: UInt8.self).baseAddress!
+            return debug_proxy_send_raw(debugProxy, baseAddress.advanced(by: byteOffset), UInt(byteCount))
+        }
+
+        if let ffiError {
+            jsException(describeIdeviceError(ffiError), in: context)
+            idevice_error_free(ffiError)
+            return nil
+        }
+
+        for _ in 0..<commandsToSend {
+            var response: UnsafeMutablePointer<CChar>?
+            let ffiError = debug_proxy_read_response(debugProxy, &response)
+            if let response {
+                idevice_string_free(response)
+            }
+            if let ffiError {
+                jsException(describeIdeviceError(ffiError), in: context)
+                idevice_error_free(ffiError)
+                return nil
+            }
+        }
+    }
+
+    return "OK"
+}